Linear Technology - Telecom, Datacom and Industrial DC/DC ... Export/Supplier...

02.2008

Telecom, Datacom and Industrial DC/DC Conversion

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CONTENTS

Table of Contents

Simplified DC/DC Conversion Block Diagrams

Page

Isolated Block Diagram

Non-Isolated Block Diagram

01

02

Description

Non-Isolated DC/DC Conversion, Up to 100V Input

Buck Controllers

Forward Controllers

Buck-Boost Controllers

Monolithic Buck Regulators

10

11

12

12

Flyback Controllers13

PoE, Hot Swap, Fuse Monitor, ORing Diode, Drivers and Reference Voltage

Power-over-Ethernet Controllers

Hot Swap™ Controllers - High Voltage

Hot Swap Controllers – Low Voltage

Fuse Monitor Controllers

14

15

16

17

ORing Diode Controllers – High Voltage

ORing Diode Controllers – Low Voltage

MOSFET Drivers

Optocoupler Driver

17

18

18-19

19

High Voltage Linear Regulators13

Isolated DC/DC Conversion, 4V to 75V Input

Flyback Controllers

Forward Controllers/Smart Drivers

Demonstration Boards - Telecom/Datacom (36V to 75V)

03-04

04-05

06

Industrial Power Conversion (9V to 36V)

Push-Pull, Half- and Full-Bridge Controllers

07

08-09

Visit www.linear.com for our complete product offering.

02065_Linear_48V_br_ A 2 4/12/07 5 31 04 PM


Isolated DC/DC Conversion

BLOCK DIAGRAMISOLATED DC/DC CONVERSION 01

Load

Flyback Controllers

Forward Controllers/Smart Drivers

Push-Pull, Half- and Full-BridgeControllers

MOSFET Drivers

Power-over-EthernetControllers

Secondary-sideForward Controllers

Secondary-side Smart Drivers

Optocoupler DriverReference Voltage

LDO Regulators

Monolithic Synchronous BuckRegulators

µModule ™Regulators

High Current StepDown Controllers

Multiple OutputRegulators

PolyPhase® StepDown Controllers

Hot Swap ControllersHigh Voltage

ORing Diode ControllersHigh Voltage

Fuse Monitor

page 15

page 17

page 3-4

page 4-5

page 8-9

page 18-19

page 14

page 4-5

page 5

page 19

Load

Load

Load

Load

Load

Load

page 17

VIN(4V - 75V) 0.6V to 52V

Optional IBA for Point of Load (POL)(Eg. 28V, 12V, 5V or 3.3V)

(1)

ORing Diode ControllersLow Voltage

Hot Swap ControllersLow Voltage

page 18 page 16

Note (1) For descriptions of these products, visit www.linear.com.

02065_Linear_48V_br_ A 3 4/12/07 5 31 04 PM


02 NON-ISOLATED DC/DC CONVERSION

Non-Isolated DC/DC Conversion

BLOCK DIAGRAM

Note (1) For descriptions of these products, visit www.linear.com.

Load

LBuck Controllers

Monolithic Buck Regulators

Flyback Controllers

High Voltage LDOs

LDO Regulators

Monolithic Synchronous BuckRegulators

µModuleRegulators

High Current StepDown Controllers

Multiple OutputRegulators

PolyPhase StepDown Controllers

Fuse Moniter

page 17

page 10

page 12

page 13

page 13

Load

Load

Load

Load

Load

Load

Optional IBA for Point of Load (POL)(E.g. 28V, 12V, 5V or 3.3V)

0.6V to 52V

Forward Controllers

page 11

VIN(4V - 100V)


page 12

(1)

Hot Swap ControllersHigh Voltage

ORing Diode ControllersHigh Voltage

page 15 page 17

ORing Diode ControllersLow Voltage

Hot Swap ControllersLow Voltage

page 18 page 16

02065_Linear_48V_br_ A 4 4/12/07 5 31 04 PM


0303 ISOLATED DC/DC CONVERSIONFLYBACK CONTROLLERS

100k

LTC3803-3

LT4430

4.7k

18V - 75V

VCC

VOUT

VCC

TIVIN

Low Power Isolated Flyback Converter

1µF

0.1µF

VCC

ITH

FB NGATE

SENSEGRND

6.8k

OPTO

FB

GRND 1.5k

11k

3.3V3A100µF

+ +

VCC

Introduction

Today’s high density power systems require very high efficiency, excellent power density and ease of implementation. Linear Technology offers a family of high performance DC/DC controllers specifically tailored for isolated power conver-sion for input voltages ranging from 4V to 75V for telecom, datacom and industrial applications. We feature primary and secondary-side control ICs, which provide synchronous rectification, fast transient response, overvoltage and overcurrent protection, and a host of other features. These devices enable output voltages from 0.6V to 52V from flyback, forward, half-bridge, push-pull or full-bridge topologies. Off-the-shelf planar magnetics can be used in many applications, reducing design complexity.

Flyback Controllers – Low Power (up to 80W)

Synchronous and non-synchronous flyback controllers are offered for output power levels up to 80W. This family of current mode flyback controllers can either regulate the output voltage with integrated primary-side regulation circuitry or can be used with a secondary-side opto-coupler driver and optoisolator. Synchronous rectification is easily controlled by the LT®3825 or LT3837 which increases conversion efficiency and improves output cross regulation in mul-tiple output power supplies. As an example, the LT3825 can convert an input supply of 36V-75V to an isolated output of 3.3V at 12A with up to 90% efficiency.

100k

47k

10k12k

412k

15k

UVLO

PGDLY

LT3825SENSE–

SENSE+

T1

Vcc

Vc

V IN36V - 75V

VOUT3.3V12A

OSC GND

FB

SG

SG

SG PG

10nF

2.2nF

47pF

470µF×3

1µF

0.1µF

47µF

2.2µF

15Ω 330

0.02Ω

T1

+

28 7k

3.01k

Isolated Synchronous Rectified No-Opto Flyback Converter

+

SYNC

LTC®3803-3 Isolated Demo board

Part Number: DC1100AVIN: 18V to 75VOutput: 3.3V@ 3A

03099_Linear_48V_br_FA indd 5 2/8/08 3:32:24 PM


Flyback Controllers – Low Power (up to 80W)

Note (1) The maximum output power depends on the choice of external components. (2) The operating frequency can be selected within the range indicated. (3) The input voltage range depends on external components.

004 ISOLATED DC/DC CONVERSION

Part Number

Output (1)Power Range

Input (3)Voltage Range

Output Voltage Range

Operating Frequency (2) Package Description

Primary Side Flyback Controllers

LTC3803-5 up to 15W 4.8V to 75V 0.8V to 52V 200kHz ThinSOT™ Constant Frequency Current Mode Flyback Controller with 5.7V UVLO

LTC3803/-3 up to 15W 8.7V to 75V 0.8V to 52V 200kHz or 300kHz

ThinSOT Constant Frequency Current Mode Flyback Controller in ThinSOT

LTC3805/-5 up to 25W 8.4V/4.5V to 75V 8.4V/4.5V to 75V 70kHz to 700kHz DFN-10MSOP-10

Selectable Frequency Current Mode

LT1737 up to 25W 4.5V to 75V 1.23V to 52V 50kHz to 250kHz SO-16, SSOP-16 No-Opto Flyback Controller

LTC3873/-5 up to 25W 8.4V/4.1V to 75V 1.2V to 52V 200kHz ThinSOT, DFN-8 Constant Frequency Current Mode Controller

LT1725 5W to 50W 16V to 75V 1.23V to 52V 50kHz to 250kHz SO-16, SSOP-16 Flyback with or without Optocoupler

LTC1871 up to 50W 2.5V to 75V 1.23V to 52V 50kHz to 1MHz MSOP-10 Wide Input Range Current Mode Controller

LT3825 5W to 80W 16V to 75V 1.23V to 52V 50kHz to 250kHz TSSOP-16 Synchronous Flyback with or without Optocoupler

LT3837 5W to 80W 4.5V to 75V 1.23V to 52V 50kHz to 250kHz TSSOP-16 Synchronous Flyback with or without Optocoupler

Forward Controllers – Medium Power (40W to 300W)

Linear Technology’s single switch and two-switch forward controllers normally operate with primary and secondary-side ICs for control, timing and driving of synchronous MOSFETs. The single switch forward converter schematic below shows the LTC3706 as a secondary-side controller with primary-side LTC3725 smart driver. Efficiencies of over 95% are achieved with this circuit for output voltages ranging from 0.6 to 52V.

FB/IN+

1µF

VIN 36V - 75V

1nF

4.7µF

100µF 220µF

VOUT 3.3V 30A

2.2nF

33nF

33nF

15k

1µF

0.1µF

0.039Ω

1µF

2.2µF

0.002Ω

0.85µH

T2

162k

5.1k

6.2k 100k

2.74k

604

100k

FS/IN–

VCC

UVLO

SSFLT

IS GATE

LTC3725

NDRV

GND

365k

PT+ FG SW IS– IS+ SG VIN VCC NDRV

GND RUN/SS SLP ITH PT–

FB LTC3706

+

T1

36V - 75V to 3.3V/30A Isolated Forward Converter

FORWARD/FLYBACK CONTROLLERS



Part NumberOutput (1)Power Range




Primary Side Controllers

LT1952 40W-300W 15.75V to 75V 1.23V to 52V 100kHz-500kHz

SSOP-16 Single Switch Synchronous Forward Controller, Can Be Used with Secondary Side LTC3900.

LT1952-1 40W-300W 8V to 75V 1.23V to 52V 100kHz-500kHz

SSOP-16 Single Switch Synchronous Forward Controller, Can Be Used with Secondary Side LTC3900.

LT3781 40W-300W 16V to 75V 1.25V to 52V 350kHz SSOP-20 Two-Switch Synchronous Forward Controller. Works with LTC1698 MOSFET Driver.

LTC3723-1 40W-300W 10.7V to 75V 1.23V to 52V Up to 1MHz SSOP-16 Single Switch Forward Controller with Low Start-up Current. Works with Secondary Side LTC3900.



OutputVoltage Range


Secondary Side Controllers

LTC3706 40W-300W 5V to 75V 0.60V to 52V 100kHz-500kHz

SSOP-24 Synchronous Forward Controller with PolyPhase Capability, Can Be Used with Primary Driver LTC3705 or LTC3725.

LTC3726 40W-300W 5V to 75V 0.60V to 52V 100kHz-500kHz

SSOP-16 Synchronous Forward Controller Can Be Used with Primary Driver LTC3705 or LTC3725.

Part NumberMOSFET Drive Current



Primary Side Smart Drivers

LTC3705 2A 9V to 75V 70kHz-700kHz SSOP-16 Two-Switch Forward Smart Gate Driver, Works with Secondary Side Synchronous Controller LTC3706 or LTC3726.

LTC3725 2A 9V to 75V 70kHz-700kHz MSOP-10 Single-Switch Forward Smart Gate Driver, Works with Secondary Side Synchronous Controller LTC3706 or LTC3726.

Part NumberMOSFET Drive Current


Secondary Side Smart Drivers

LTC3900 2A 100kHz-500kHz SO-8 Synchronous Rectifier Driver for Forward Converters, Can Be Used with Primary Controller LT1952 or LTC3723.

LTC3901 2A 100kHz-500kHz SSOP-16 Synchronous Rectifier Driver for Push-Pull and Full-Bridge Converters, Can Be Used with Primary Controller LTC3722 or LTC3723.

LTC1698 2A 350kHz SSOP-16 SO-16

Synchronous Rectifier Driver for Forward Converters, Can Be Used with Primary Controller LT1952, LTC3723 or LT3781.


Forward Controllers/Smart Drivers – Medium Power (40W to 300W)

005 ISOLATED DC/DC CONVERSION FORWARD CONTROLLERS/SMART DRIVERS

02065_Linear_48V_br_ A 7 4/12/07 5 31 05 PM


006

Demonstration Board Number Output Rating Circuit Size Description

DC1100A 3.3V/3A (1.63" x 0.56") LTC3803-3/LT4430 Flyback (18V to 75V) Input Voltage Range

DC649A 5V/2A 1.10" x 1.25" LTC3803 Flyback

DC894A-A 3.3V/12A 1.25" x 1.20" LT3825 Flyback

DC894A-B 5V/8A 1.25" x 1.20" LT3825 Flyback

DC894A-C 12V/5A 1.25” x 1.20” LT3825 Flyback

DC1031A-A 2.5V/20A 1/8 brick (0.9” x 2.3”) LTC3725/LTC3726 Forward

DC1031A-B 3.3V/20A 1/8 brick (0.9” x 2.3”) LTC3725/LTC3726 Forward

DC968A-A 3.3V/30A 1/8 brick (0.9” x 2.3”) LT1952/LTC3900/LT4430 Forward

DC759 5V/20A 1/8 brick (0.9” x 2.3”) LT1952/LTC1698 Forward

DC1031A-C 5V/20A 1/8 brick (0.9” x 2.3”) LTC3725/LTC3726 Forward

DC968A-C 12V/12A 1/8 brick (0.9” x 2.3”) LT1952/LTC3900 Forward

DC1032A 12V/10A 1/8 brick (0.9” x 2.3”) LTC3725/LTC3726 Forward

DC968A-D 28V/4A 1/8 brick (0.9” x 2.3”) LT1952/LTC3900 Forward

DC776A 1.5V/45A 1/4 brick (1.45" x 2.3") LTC3705/LTC3706 Forward

DC830 3.3V/40A 1/4 brick (1.45" x 2.3") LT1952/LTC3900 Forward

DC677A 3.3V/50A (1.7" x 2.9") LT1952/LTC3900 Forward

DC888A-A(1) 3.3V/50A 1/4 brick (1.45" x 2.3") LTC3725/LTC3706 Forward

DC888A-B (1) 5V/35A 1/4 brick (1.45" x 2.3") LTC3725/LTC3706 Forward

DC888A-C (1) 12V/20A 1/4 brick (1.45" x 2.3") LTC3725/LTC3706 Forward

Linear Technology offers demonstration boards for a wide variety of applications, including isolated and non-isolated power supplies. In addition to the demonstration board, we supply the electrical schematic, bill of materials and Gerber files for the PCB design. We also include a Quick Start Guide that describes the circuit operation and provide performance curves including load regulation, ripple and noise, efficiency and transient response.

We can also develop customized solutions if the exact demo board for a specific requirement does not exist. Contact your local sales representative for further details.

Below are photos of standard demo boards showing the industry-standard size 1/8 brick, measuring 0.9" x 2.3" and 1⁄4 brick, measuring 1.45" x 2.3" form factors. Both convert a 36V to 75V input to isolated output voltages ranging from 0.6V to 52V. Efficiencies up to 95% are realized using off-the-shelf planar power transformers and inductors.

The table below is a listing of 48V input flyback and forward isolated demonstration boards that operate from a 36V to 75V input,

unless otherwise noted.

Demonstration Boards – Isolated Solutions for Telecom and Datacom Applications

Figure 1 - 1/4 brick size demo board

Note (1) These boards are designed to be paralleled for higher current applications.

Figure 2 - 1/8 brick size demo board

DEMONSTRATION BOARDS – TELECOM/DATACOM ISOLATED DC/DC CONVERSION

02065_Linear_48V_br_ A 8 4/12/07 5 31 05 PM


007INDUSTRIAL POWER

Many industrial applications demand high efficiency and high density power supply solutions at lower input voltages. Linear Technology offers multiple controllers specifically designed for isolated power conversion from common 12V and 24V sources. Advantages of these solutions include reduced complexity, synchronous rectification and the ability to accommodate other output voltages and power levels with relatively minor changes to existing designs. Leveraging these flyback and forward solutions result in shorter design cycles and flexible designs.

Isolated Solutions for Industrial Applications

Demonstration Board Number Output Rating Circuit Size Description

DC1038A-A 3.3V/10A 1.2” x 1.5” LT3837 Flyback

DC1038A-B 5V/7A 1.2” x 1.5” LT3837 Flyback

DC1038A-C 12V/3A 1.2” x 1.5” LT3837 Flyback

DC950A-B 2.5V/3A, 3.3V/3A, 5V/2A 1/8 brick (0.9” x 2.3”) LT3837 Flyback

DC1174A-A 5V/10A 1/8 brick (0.9” x 2.3”) LTC3725/LTC3726 Forward

DC1174A-B 12V/4A 1/8 brick (0.9” x 2.3”) LTC3725/LTC3726 Forward

DC1174A-C 15V/3A 1/8 brick (0.9” x 2.3”) LTC3725/LTC3726 Forward

The table below is a listing of 9-36V input isolated flyback and forward demonstration boards.

10k

1µF

15k

VCC

Iso ated Synchronous Rectified No-Opto Flyback Converter

TI

SG

SG PG SENSE

SENSE

GND OSCAP SYNC

UVLO

FB

2.2nF

CCMP tON

3.01k

100k 47pF 0.1µF

20k

3.3nF

SG

330

0.1µF 2.2nF

1µF

15

4.7

1nF 10

47µF x 3 220µF

VOUT 3.3V 10A

0.1µH

10Ω

0.007Ω

22.1k

10k

22µF

VIN 9V - 36V

LT3837

86.6k

VC

Front view Back view

ISOLATED DC/DC CONVERSION

LTC3837 Isolated Demo board

Part Number: DC1038A-AVIN: 9V to 36VOutput: 3.3V@10A

02065_Linear_48V_br_ A 9 4/12/07 5 31 06 PM


008 ISOLATED DC/DC CONVERSION PUSH-PULL, HALF- AND FULL-BRIDGE CONTROLLERS

The LTC3721 and LTC3723 controllers are well suited for power levels from 100W to 750W, providing simple solutions for high power applications. Synchronous and non-synchronous rectification modes of operation are supported. The push-pull, half- and full-bridge configurations offer smaller input filter and output inductors compared to single-ended converters. They also provide up to 40% greater transformer utilization and balanced semiconductor dissipation over the input voltage range.

VCC

SSGND

COMP

VREF

CS

DRVB

DRVA

UVLO

VOUT

LTC3723-1

VOUT

SDRB

SDRA

LT3901

SYNC ME

MF

OC

COMP

FB

GND

OPTOV IN

LT4430

V IN

Isolated Synchronous Rectified Push-Pull Converter

+

PartNumber

Output (1)Power Range




Primary Side Push-Pull, Half-Bridge and Full-Bridge Controllers

LTC3721-1 100W to 750W 10.7V to 75V 1.2V to 52V Up to 1MHz SSOP-16QFN-16

Push-Pull and Full-Bridge Non-Synchronous Topologies

LTC3723-1 100W to 750W 10.7V to 75V 1.2V to 52V Up to 1MHz SSOP-16 Push-Pull and Full-Bridge Current Mode Synchronous Topologies

LTC3723-2 100W to 750W 10.7V to 75V 1.2V to 52V Up to 1MHz SSOP-16 Push-Pull, Half-Bridge and Full-Bridge Voltage Mode Synchronous Topologies


Push-Pull, Half- and Full-Bridge Controllers – High Power (100W to 750W)

VCC

SSGND

COMP

VREF

CS

DRVB

DRVAUVLO

VOUT

LTC3721-1

V IN

+

VOUT

OC

COMP

FB

GND

OPTOV IN

LT4430

Isolated Non-Synchronous Push-Pull Converter

02065_Linear_48V_br_ A 10 4/12/07 5 31 06 PM


009FULL-BRIDGE PHASE-MODULATED CONTROLLERS ISOLATED DC/DC CONVERSION

The phase-modulated full-bridge LTC3722 con-troller employs zero voltage switching (ZVS) with phase-shifted power supply control, intended for isolated off-line and distributed power supplies of 200W to 1 kilowatt. This device operates at a selectable fixed frequency with current mode con-trol and adaptive zero voltage delay control over all operating conditions, optimizing efficiency and reducing transformer size and EMI. This controller also provides simple programmability for current limit, leading edge blanking, soft start, and short circuit protection.

LTC3722-1VOUT

VIN36V - 75V

LTC3901

Typical Full-Bridge Circuit

OUTC

OUTA

OUTB

OUTD

CS

OUTF

OUTEGRD

VCC


Full-Bridge Phase-Modulated Controllers – Higher Power (200W to 1KW)





Primary Side Full-Bridge Controllers

LTC3722-1 200W to 1KW 10.5V to 75V 5V to 24V 300kHz to 1MHz

SSOP-24 Full-Bridge Synchronous with ZVS, Current Mode Control.

LTC3722-2 200W to 1KW 10.5V to 75V 5V to 24V 300kHz to 1MHz

SSOP-24 Full-Bridge Synchronous with ZVS, Voltage Mode Control.

LTC3722-1 Isolated Demonstration Board

Part Number DC607AVIN: 36V to 75V, Output: 12V@ 35A

02065_Linear_48V_br_ A 11 4/12/07 5 31 07 PM


10

Part Number

VIN Min (V)

VIN

Max (V)VOUT Min (V)

VOUT

Max (V)Max Output Current (A) (1)

Synchronous Operation

OperatingFrequency (2)

No Sense Resistor

IQ

(Supply) Package

LT3724 4 60 1.23 36 5 200kHz 100µA TSSOP-16

LTC3824 4 60 0.8 VIN 5 200kHz to 600kHz

40µA MSOP-10

LTC3703-5 4.1 60 0.8 0.93VIN 10 X 100kHz to 600kHz

X 1.7mA SSOP-16,SSOP28

LTC3703 9.3 100 0.8 0.93VIN 10 X 100kHz to 600kHz

X 1.7mA SSOP-16,SSOP28

LT3844 4 60 1.23 36 10 100kHz to 600kHz

120µA TSSOP-16

LT3800 4 60 1.23 36 20 X 200kHz 80µA TSSOP-16

LTC3812-5 4.2 60 0.8 0.93VIN 20 X 100kHz to 1MHzConstant On-Time

X 3mA TSSOP-16

LT3845 4 60 1.23 36 20 X 100kHz to 600kHz

120µA TSSOP-16

LTC3810 6.2 100 0.8 0.93VIN 20 X 100kHz to 1MHzConstant On-Time

X 3mA SSOP-28

LTC3810-5 4.2 60 0.8 0.93VIN 20 X 100kHz to 1MHz Constant On-Time

X 3mA QFN-32

Linear Technology offers controllers, monolithic switching regulators and linear regulators for high voltage (up to 100V) non-isolated step-down DC/DC power conversion. Topologies include synchronous and non-synchronous buck, buck-boost, forward, and flyback converters. Included are low quiescent current controllers and monolithic parts that help preserve battery life during standby mode.

Shown below are synchronous and non-synchro-nous buck controllers that operate from input voltages up to 100 volts. Selection parameters include output voltage range, operating frequency, quiescent current and choice of sense resistor.

Buck Controllers – High Voltage

Introduction

LT3845

SW

TG

VCC

SHDN

PGND

VIN20V - 55V

BURST_EN

+ BOOST

BG

VOUT12V6A

SENSE ¯ SENSE +

SYNC

+

100µF

100µF

1µF

0.01Ω

1µF

VIN

High Voltage Step-Down Regulator 48V to 12V/6A

10K

16.2K

49.9K

143K

680pF 100pFVC

VFB

FSET

Note (1) The maximum output current depends on the choice of external components. (2) The frequency can be selected within the range indicated.

HIGH VOLTAGE BUCK CONTROLLERSNON-ISOLATED DC/DC CONVERSION

02065_Linear_48V_br_ A 12 4/12/07 5 31 08 PM


11

A forward converter is the preferred topology for high step-down ratio non-isolated applications. This topology produces a higher efficiency converter when stepping down from 48V to voltages below 12V versus a conventional buck and allows the use of smaller input and output capacitors.

Forward Controllers

Part NumberVIN Min (V)

VIN Max (V)

VOUT

Min (V)VOUT

Max (V)Max Output Current (A) (2)



IQ (SUPPLY) Package

Forward Controllers

LT1952 15.75 75 1.23 52 40 100kHz to 500kHz 5.2mA SSOP-16

LT1952-1 8 75 1.23 52 40 100kHz to 500kHz 5.2mA SSOP-16

LTC3706 (4) 5 75 0.6 52 50 x 70kHz to 500kHz 4.2mA SSOP-24

LTC3726 (4) 5 75 0.6 52 50 x 70kHz to 500kHz 4.2mA SSOP-16

Note (2) The maximum output current depends on the choice of external components. (3) The frequency can be selected within the range indicated. (4) These IC’s can be paralleled for higher current applications.

115k

LT1952

4.7k

36V - 75V

ROSC

R3

VIN

Typical Non-Isolated Forward Converter

10µFVIN

VFB

DC

OUT

COMP

GRND

10nF

1.23V-52V2.2µF

R2R1

R4

47µF

VOUT

Note (1) The values of R1 thru R4 are determined by the input voltage range and output voltage.

FORWARD CONTROLLERS

VCC

VC

Typical Non-Isolated Synchronous Forward Converter

SG

VIN

SW FG IS–

GND SLP MODE RUN/SS

PT+ FB

100µF

10k

220µF

2.2µF

2.2µF

R1

R2

2.2nF

6.2k 100k 100k 33nF

0.012Ω

1nF

VIN 36V - 75V VOUT

0.6V to 52V

NOTE: THE VALUES OF R1 AND R2 ARE SELECTED FOR THE OUTPUT VOLTAGE

LTC3726

IS+

NON-ISOLATED DC/DC CONVERSION

02065_Linear_48V_br_FA.r1.indd 13 7 4/16/07 5:38:17 PM


212

Monolithic Buck Regulators – High Voltage

Monolithic buck regulators include the switching MOSFET or transistor, and the current sense resis-tor inside the device to simplify the circuit design. Shown below is a list of non-synchronous parts used for up to 80V step-down regulation.

LT3430

SW

FB

VIN

SHDN BIAS

VIN5 5V - 60V

SYNC

+ 4.7µF

BOOST

GND

0.68µF22µH VOUT

5V2A

100µF10V

15.4k

4.99k

OFF ON

48V to 5V at 2A Step-Down Monolithic Converter


VIN Max (V)

VOUT Min (V)

VOUT Max (V)

Output Current (A)

OperatingFrequency

IQ (SUPPLY) Package

LT3437 3.3 60,80pk 1.25 0.90VIN 0.4 200kHz 100µA TSSOP-16E, DFN-10

LT1676 7.4 60 1.25 0.9VIN 0.44 100kHz 3.2mA SO-8

LT1976/B 3.3 60 1.25 0.90VIN 1.2 200kHz 100µA/3.2mA TSSOP-16E

LT1977 3.3 60 1.25 0.86VIN 1.2 500kHz 100µA TSSOP-16E

LT1956 5.5 60 1.2 0.75VIN 1.2 500kHz 2.5mA TSSOP-16E




LT3430/-1 5.5 60 1.22 0.90VIN 2.75 200kHz/100kHz 2.5mA TSSOP-16E


LT1074HV 8 60 2.21 0.85VIN 5.0 100kHz 100µA 5-Lead TO-220, 7-Lead DD


Linear offers high performance 4-switch synchro-nous buck-boost controllers that operate from an input voltage above, below or equal to the output voltage. These controllers utililze a single inductor and can deliver efficiencies up to 98%.

LTC3780BG2

VIN 4V - 36V

SENSE-

GRND

Simplified Buck-Boost Schematic

SENSE+BG1

TG2 TG1

VSENSE

VOUT0 8V to 30V

+ +

BUCK-BOOST CONTROLLERS/HIGH VOLTAGE MONOLITHIC BUCK REGULATORS

Part Number Output Ratings Input Voltage Range Approximate Circuit Size Description

Buck-Boost Demonstration Boards

DC686A 12V/5A 5V to 32V 1.5” x 1.5” LTC3780 Buck-Boost

DC1046A 48V/6A (1) 36V to 72V (1) 2” x 2” LTC3780 Buck-Boost

Note (1) The maximum current and voltage are dependent on external components.Note (2) The frequency can be selected within the range indicated.

Part Number VIN Min (V) VIN Max (V) VOUT Min (V) VOUT Max (V) Output Current (A) (1)OperatingFrequency (2) Package


LTC3780 4 36 0.8 30 10 200kHz to 400kHz QFN-32, SSOP-24

LTC3785 2.7 10 2.7 10 10 100kHz to1MHz QFN-24, SSOP-28

NON-ISOLATED DC/DC CONVERSION

02065_Linear_48V_br_ A 14 4/12/07 5 31 09 PM


313


VIN (3)Max (V)

VOUT Min (V)

Max Output Current (A) (1)



IQ (Supply) Package

LTC3803/-3 8.7 75 0.8 3 200kHz or 300kHz 240µA TSOT-23

LTC3803-5 4.8 75 0.8 3 200kHz 240µA TSOT-23

LTC3805/-5 8.4/4.5 75 0.8 3 70kHz to 700kHz 360µA DFN-10, MSOP-10

LTC3873-5 4.1 75 1.2 3 200kHz 260µA TSOT-23, DFN-8

LTC3873 8.4 75 1.2 3 200kHz 260µA TSOT-23, DFN-8

LTC1871 2.5V 75 1.23 5 50kHz to 1MHz 250µA MSOP-10

LT1725 16 75 1.25 5 50kHz to 250kHz 280µA SO-16, SSOP-16

LT1737 4.5 75 1.23 5 50kHz to 250kHz 10mA SO-16, SSOP-16

LTC3806 10 75 1.23 5 X 250kHz 1mA DFN-12

LT3837 4.5 75 1.23 12 X 50kHz to 250kHz 6.4mA TSSOP-16

LT3825 16 75 1.23 12 X 50kHz to 250kHz 400µA TSSOP-16

Flyback Controllers

The flyback topology is one of the simplest types of switching converters and is used for single and multiple outputs. It works well over wide input ranges, typically supplies up to 60 watts and is very cost effective.

Linear Technology offers several very robust, high voltage LDO regulators with an 80V or higher input voltage rating.

High Voltage Linear Regulators

56k

GNDLTC3803

48V to 5V at 2A Flyback Converter

I TH /RUN

SENSE

Vcc

VFB

V IN 36V - 75V

NGATE

10k

T1

0.0022µF

10µF

20k

0.068Ω 150k

4.7µF 300µF

VOUT5V2A

LT3014B

VOUT 5V20mA

VIN

5.4V - 80V

1µF 0.47µF 3.92M

1.27M

IN OUT

ADJGND

High Input Voltage LDO Circuit

Part Number IOUT

Min VIN (V)

Max VIN (V)

Dropout Voltage (V@IOUT )

IQ

(Supply)Shutdown Current

VOUT Range (V) Package

LT3014 20mA 3.0 80 0.35 7µA <1µA 1.22 to 60 ThinSOT, DFN-8

LT3014HV 20mA 3.0 80, 100pk 0.35 7µA <1µA 1.22 to 60 ThinSOT, DFN-8

LT3014B 20mA 3.0 80 0.35 7µA n/a 1.22 to 60 ThinSOT, DFN-8

LT3014BHV 20mA 3.0 80, 100pk 0.35 7µA n/a 1.22 to 60 ThinSOT, DFN-8

LT3010 50mA 3.0 80 0.30 30µA <1µA 1.275 to 60 MSOP-8

LT3010H 50mA 4.0 80 0.40 30µA <1µA 1.275 to 60 MSOP-10

LT3012 250mA 4.0 80 0.40 40µA <1µA 1.24 to 60 TSSOP-16, DFN-12

LT3012B 250mA 4.0 80 0.40 40µA n/a 1.24 to 60 TSSOP-16, DFN-12

LT3013 250mA 4.0 80 0.40 65µA <1µA 1.24 to 60 TSSOP-16, DFN-12

LT3013B 250mA 4.0 80 0.40 65µA n/a 1.24 to 60 TSSOP-16, DFN-12

Note (1) The maximum output current depends on the choice of external components. (2) The operating frequency can be selected within the range indicated. (3) The maximum input voltage depends on external components.

FLYBACK CONTROLLERS/HIGH VOLTAGE LDO REGULATORS NON-ISOLATED DC/DC CONVERSION



14

–

+

0.5-48V

Rx

RxTx

Tx

PSE RJ45 RJ45

CAT5

SPARE PAIR

DATA PAIR

DATA PAIR

SPARE PAIR

VOUT

PD

LTC4259A-1

DGND AGND

SCL

SDAIN

SDAOUT

SENSE GATE OUTVEE

I2C

RCLASS

LTC4257

-48VIN -48VOUT

PWRGD

GND DC/DCCONVERTER

Part Number PSE/PD Channels Description

IEEE-Compliant Detection

IEEE-Compliant Classification

IEEE-Compliant Disconnection Package

LTC4257 PD 1 IEEE 802.3af PD PoE Interface Controller

yes (Internal 25k Resistor)

yes (programmable)

n/a SO-8, DFN-8

LTC4257-1 PD 1 IEEE 802.3af PD PoE Interface Controller with Dual Current Limit


yes (programmable)

n/a SO-8, DFN-8

LTC4258 PSE 4 Quad IEEE 802.3af PoE Controller with Integrated Detection

yes yes yes (DC-current)

SSOP-36

LTC4259A-1 PSE 4 Quad IEEE 802.3af PoE Controller with AC Disconnect

yes yes yes (DC- or AC-current)

SSOP-36

LTC4263 PSE 1 Single IEEE 802.3af PSE Controller with Internal Switch

yes yes yes (DC- or AC-current)

SO-14, DFN-14

LTC4267 PD 1 IEEE 802.3af PD PoE Interface Controller with Integrated Switching Regulator


yes (programmable)

n/a SSOP-16, DFN-16

Building on its industry-leading Hot Swap technology, Linear Technology offers cost effective solutions for delivering Power over Ethernet, including controllers for Power Sourcing Equipment (PSE) and Powered Devices (PD).

The LTC4259A-1 is a quad Power-over-Ethernet (PoE) controller designed for use in IEEE 802.3af compliant power sourcing equipment. It consists of four independent ports, each with output current limit, short-circuit protection, complete powered device detection and AC or DC disconnect sensing. Used with external power MOSFETs and a few passives, the LTC4259A-1 can operate autonomously or be con-trolled by an I2C serial interface.

The LTC4263 is an autonomous single-channel PSE controller for use in IEEE 802.3af compliant PoE systems. It includes an onboard power MOSFET, inrush current limit and short-circuit control, IEEE 802.3af compliant PD detection and classification circuitry, and select-able AC or DC disconnect sensing. Onboard control algorithms provide complete IEEE 802.3af compliant operation without the need for a microcontroller. The LTC4263 simplifies PSE implementation, requiring only a single 48V supply and a few passive support components.

The LTC4267 combines a rugged IEEE 802.3af compliant PD interface with a current mode switching regulator, providing a complete power solution for PD applications. The LTC4267 integrates the 25kΩ signature resistor, classification current source, thermal overload protection, signature disable and power good signal, along with an undervoltage lockout optimized for use with the IEEE-required diode bridge. The high voltage internal MOSFET withstands up to 100V transients and the precision dual level input current limit allows the LTC4267 to charge large load capacitors and interface with legacy PoE systems.

Power-over-Ethernet Controllers

POWER OVER ETHERNET

02065_Linear_48V_br_ A 16 4/12/07 5 31 10 PM


15

Hot Swap Controllers – High Voltage

Part Number

Input Voltage Range (V)

In-Rush Control UV OV Fault Reset PWRGD Comments Package

LT1640A -10 to -80 Miller Cap yes yes yes PWRGD# (L) or PWRGD (H) Output

SO-8

LT1641 9 to 80 Active yes yes Latch-Off/Auto-Retry Operation SO-8

LT4250 -20 to -80 Miller Cap yes yes yes LT1640A Pin-Compatible with Active Current Limiting

SO-8

LTC4251 -15 Min (floating) Active Combined Combined Three-Level Circuit Breaker SOT-23

LTC4252/LTC4252A

-15 Min (floating) Active/SS yes yes yes Soft-Start (SS) Ramps Inrush Current During Start-Up. Drain Accelerated Response. ±1% Undervoltage/Overvoltage Threshold Accuracy (LTC4252A) for AdvancedTCA Applications

MS8MS10

LTC4253A-ADJ

-15 Min (floating) Active/SS yes yes yes yes Adjustable Threshold and Hysteresis on the UV/OV Detectors

SSOP-20 QFN-20

LT4254 10.8 to 36 Active yes yes yes Open Circuit Detect Output SSOP-16

LT4256 10.8 to 80 Active yes yes Latch-Off/Auto-Retry Operation SO-8

LTC4260 8.5 to 80 Active yes yes yes On Board 8-bit ADC for Card Voltage and Current Monitoring, I2C interface. Optional Latch-Off or Autoretry

SO-24, SSOP-24, QFN-32

LTC4261 -12 to -100 Active yes yes yes yes On Board 10-bit ADC for Card Voltage and Current Monitoring, I2C Interface. Programmable Latch-off or Autoretry

SSOP-28, QFN-24

Hot Swap controllers allow a circuit board to be safely inserted and removed from a live backplane. Using an N-channel pass MOSFET, the board supply voltage can be ramped at an adjustable rate. Features include independent adjustable inrush current and overcurrent limits to minimize stresses on the pass MOSFET during start up, input step and output short circuit conditions. Newer generation devices include an on-board ADC for board voltage and current monitoring, and an I2C interface for microcontroller interaction.

BACKPLANE PLUG-IN CARD

48V

SDA

SCL

ALERT

GND

0.010VOUT48V

CONN

ECTO

R 1

CONN

ECTO

R 2

+

UV VDD SENSE

LTC4260

GATE

GND

FB

SOURCE

OV

SDAO

SDAI

SCL

ALERT

ON

Typical 48V-3A Hot Swap Control

HOT SWAP CONTROLLERS – HIGH VOLTAGE

02065_Linear_48V_br_ A 17 4/12/07 5 31 11 PM


16

Hot Swap Controllers – Low Voltage

Part Number

Circuit Breakers

Input Voltage Range (V)

In-Rush Control Fault Reset PWRGD Comments Package

LTC1422 1 2.55 to 13.2 Ramp yes System Reset, Programmable Current Limit SO-8

LTC1645 2 1.18 to 13.2 2.3 to 13.2

Ramp yes Dual-Level on Pin for Power Supply Sequencing, Spare Comparator in 14-Pin Version

SO-8, SO-14

LTC1647 2 2.7 to 16.5 Ramp Dual ON Pins for Power Sequencing or Enabling Separate Loads from a Common Supply

SO-8

LTC4210 1 2.7 to 16.5 Active yes Active Current Limiting with a Circuit Breaker. Automatic Retry/ Latch Off

SOT-23

LTC4211 1 2.5 to 16.5 Active yes yes No Gate Capacitor Required SO-8, MS-8, MS-10

LTC4212 1 2.5 to 16.5 Active yes Power Good Input with Timer and Glitch Filter MS-10

LTC4214 1 -6 to -16 Active yes yes Multi Level Current Limiting, Controls -5V Supplies if Positive Supply is Available

MS-10

LTC4215 1 2.9 to 16.5 Active I2C, Internal 8-bit ADC, di/dt Controlled Soft Start SSOP-16QFN-24

LTC4216 1 0 to 6 Active Ultra Low Voltage Hot Swap Controller for 0V to 6V, with a Separate Supply of 2.3V to 6V. Adjustable Current Limit, Soft-Start and Response Time for Overcurrent Protection

MSOP-10,DFN-12

LT4220 2 2.7 to 16.5 -2.7 to -16.5

Active yes yes Controls Positive and Negative Voltages. Selectable Tracking Mode

SSOP-16

LTC4221 2 2.7 to 13.5 1 to 13.5

Active yes yes Dual Hot Swap Controller/Power Sequencer with Dual Speed and Dual Level Fault Protection, One Channel Operates from 1V

SSOP-16

Low voltage Hot Swap controllers include independent high side gate driver(s) to control single or dual voltages, as well as voltage power-up and power-down ramp control, current foldback and inrush limiting.

LTC4211

+

VCC SENSE GATEFB

RESETGNDTIMER

ON20k

10k

PCB CONNECTION SENSE 10nF

15k

10k

30k

µP LOGIC

RESET

VOUT0.007

SHORT

LONG

LONG

PCB EDGECONNECTOR(MALE)

BACKPLANECONNECTOR

(FEMALE)

GND

VCC

Single Channel Hot Swap Controller Circuit

HOT SWAP CONTROLLERS – LOW VOLTAGE

02065_Linear_48V_br_ A 18 4/12/07 5 31 11 PM


17

48V Fuse Monitor

The LTC1921 monitors two independent -48V supplies, including their fuses and drives up to three optoisolators to indicate status. Requiring only three noncritical resistors and optoisolators, the LTC1921 replaces multiple voltage comparators, a voltage reference and several precision resistors.

LTC1921

VA

VB

FUSE A

FUSE B

OUT F

OUT A

OUT B

RTN

FUSE GOOD

SUPPLY A GOOD

SUPPLY B GOOD

F1SUPPLY A–48V

SUPPLY B–48V

F2

100k

–48VRETURN

100k

SUPERVISORµP

LOGICSUPPLY

LOGICCOMMON

–48V LOAD

Dual Supply Fuse Monitor

Part Number Input Voltage Range UV OV Package

LTC1921 -10V to -80V yes yes MSOP-8, SO-8

ORing Diode Controllers – High Voltage

The LTC4354 is a negative voltage and the LTC4355 is a positive voltage diode-OR control-ler that drives two external N-channel MOSFETs. Each replace two Schottky diodes and the associ-ated heatsink, saving power and space. The power dissipation is greatly reduced by using N-channel MOSFETs as the pass transistors. Power sources can be easily ORed together to increase total system power and reliability.

Part Number Input Voltage RangeTypical Current Capability External FET

Supply for FET Gate Drive Package

LTC4354 -4.5V to -80V 5A N-Channel Not Required SO-8, DFN-8

LTC4355 9V to 80V 5A N-Channel Not Required SSOP-16, DFN-14

LTC4354

VCC

RTNA

Positive and Negative Supply Diode-ORing

VA=-48V

DA

LTC4355

RTNB

VB=-48V

DB GA GB VSS

GND

IN1 GATE1 IN2 GATE2 OUT

LOAD

48V FUSE MONITOR/ORING DIODE CONTROLLERS

02065_Linear_48V_br_ A 19 4/12/07 5 31 12 PM


18 ORING DIODE CONTROLLERS – LOW VOLTAGE/MOSFET DRIVERS

Part Number Input Supply RangeTypical Current Capability (1) External FET Supply for FET Gate Drive Package

LTC4412 2.5V to 28V ≤ 5A P-Channel n/a ThinSOT

LTC4412HV 2.5V to 36V ≤ 5A P-Channel n/a ThinSOT

LTC4350 1.5V to 12V ≤ 5A N-Channel Charge Pump SSOP-16

LT4351 1.2V to 18V ≤ 5A N-Channel On-Board Boost Regulator MSOP-10

LTC4414 3V to 36V ≤ 5-75A P-Channel n/a MSOP-8

LTC44161-1 3.6V to 36V ≤ 5-75A P-Channel-Dual n/a MSOP-10

MOSFET Drivers

High-side and low-side N-channel and P-channelMOSFET drivers provide powerful gate drive to mini-mize switching losses in all types of power supplies.

ORing Diode Controllers – Low Voltage

P-channel and N-channel low voltage ORing diode controllers permit highly efficient ORing of multiple power sources.

LTC4414SENSEVIN

GATE

STAT

GND

POWERSUPPLY

INPUT

BATTERYCELL(S)

TO LOAD

STATUS OUTPUTLOW WHEN POWERSUPPLY PRESENT

VCC

Automatic Switchover Circuit Between a Battery and a Power Supply to Load

INP

GND

VCC

TG

BOOST

TS

VCC

INP

GND

BOOST

TGTS

LTC4440

LTC4440

VCC9V TO 72V

LTC3722-1

VCC

Typical High Side Gate Driver Circuit

Note (1) Depends on MOSFET selection.



19MOSFET DRIVERS/OPTOCOUPLER DRIVER

The LT4430 drives optoisolators that cross the isolation barrier in an isolated power supply. The IC contains a precision-trimmed reference and a high bandwidth error amplifier. The LT1431 is an adjustable shunt voltage regulator with 100mA sink capability and ±0.2% initial reference voltage accuracy.

Part NumberDriver Current Limit (mA) Initial Accuracy

Tolerance over Temp range

Reference Voltage (V) Package

LT4430 10 +/-0.75% +/-1.25% (-40˚C to 125˚C) 0.6 ThinSOT

LT1431 100 +/-0.2% +/-1.4% (-40˚C to 85˚C) 2.5 S-8/N-8/TO-92

Optocoupler Driver/ Reference Voltage

Part Number Function Peak Current (A) VIN (V) Package

Single Output

LTC1693-5 P-Channel MOSFET Driver 1.5 4.5 to 13 MSOP-8

LTC1693-3 N-Channel MOSFET Driver 1.5 4.5 to 13 MSOP-8

LTC4441 N-Channel MOSFET Driver 6 5 to 25 MSOP-10, SO-8

LTC4440 High Speed, High Voltage High Side MOSFET Driver 2.4 6.5 to 80 MSOP-10, SO-8

LTC4440-5 High Speed, High Voltage High Side MOSFET Driver 1.1 4 to 60 MSOP-8E, ThinSOT

LTC4442/-1 N-Channel Synchronous MOSFET Driver 5 6 to 38/7 to 38 DFN-8, MSOP-8

LTC4443/-1 N-Channel Synchronous MOSFET Driver (Integrated Bootstrap Diode)

5 6 to 32/7 to 32 DFN-12

Dual Output

LTC1693-1 Dual MOSFET Driver, 2 Non-Inverting 1.5 4.5 to 13 SO-8

LTC1693-2 Dual MOSFET Driver, 1 Non-Inverting, 1 Inverting 1.5 4.5 to 13 SO-8

MOSFET Drivers

+

LT1952

LT4430

FB

OPTO

OC

VCC

VOUT

ISOLATIONBARRIER

VIN +

Typical Optoisolator Drive Circuit

VIN

02065_Linear_48V_br_ A 21 4/12/07 5 31 12 PM


20 NOTES

02065_Linear_48V_br_ A 22 4/12/07 5 31 12 PM

creo


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