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ELM1117HH Bipolar 1A LDO voltage regulator

ELM1117HH is bipolar LDO three terminal voltage regulator. This series includes thermal shutdown protection and short circuit current limiter. ELM1117 series is available in fixed version (ELM1117HH-xx Vout:1.2V, 1.8V, 2.5V, 3.3V) and adjustable version (ELM1117HH Vout:1.25V to 14.6V).

• Output voltage range (fixed) : 1.2V, 1.8V, 2.5V, 3.3V (adj.) : 1.25V to 14.6V• Output current : 1A• Low dropout : Typ.1.2 V (at 1A Output current)• Line regulation : Typ.0.04%• Load regulation : Typ.0.4%• Thermal limit burn-in : 100% • Current-limit : Typ.1A• Thermal shutdown protection : 150°C• Package : SOT-223

• High efficiency linear regulators• Post regulators for switching supplies• Adjustable power supply

ELM1117HH-xx-S, ELM1117HH-SSymbol

a Package H: SOT-223b Product version H

c, d Output voltage 12: Vout=1.2V, 18: Vout=1.8V25: Vout=2.5V, 33: Vout=3.3V

e Taping direction S: Refer to PKG file

ELM1117 H H - x x - S ↑ ↑ ↑ ↑ ↑ a b c d e

ELM1117 H H - S ↑ ↑ ↑ a b e

■General description

■Features ■Application

■Maximum absolute ratings

■Selection guide

• Fixed version

• Adj. version

Parameter Symbol Limit UnitInput voltage Vin +20 VPower dissipation Pd Internally limited WOperating junction temperature Top -40 to +125 °CStorage temperature Tstg -65 to +150 °CThermal resistance junction to ambient Rθja 63 °C/WLead temperature (soldering 10s.) Tlead 300 °CMinimum ESD rating (HBM) Vesd 3 kV

* Taping direction is one way.

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• Fixed type

■Typical application

• Adjustable type

Vout=Vref (1+R2/R1)+Iadj×R2

Pin No. Pin name1 ADJ/GND

2/TAB VOUT3 VIN

SOT-223(TOP VIEW)

■Pin configuration

ELM1117HH Bipolar 1A LDO voltage regulator

Notes:1) Cin needed if device is far from filter capacitors.2) Cout minimum value required for stability.

■Block diagram

_+

GND

Vin

ADJ

Vout

For adjustablevoltage device

For fixedvoltagedevice

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ELM1117HH Bipolar 1A LDO voltage regulator

■Marking

• ELM1117HH-xx(Fixed type)

1117S a,b c to m

: Product No.code: Output voltage (e.g. : 33=3.3V): Assembly lot No. : 0 ~ 9 and A ~ Z

• ELM1117HH(Adj. type)

1117SA a to k

: Product No.code: Assembly lot No. : 0 ~ 9 and A ~ Z

Parameter Symbol Condition Min. Typ. Max. UnitOperating voltage Vin * 16 VOutput voltage(adj.) Vout Max.Pd < 2.25W 1.25 14.60 VReference voltage(Note 1)(adj.) Vout_ref Vin=+5V, Iload=10mA 1.232 1.250 1.268 V1.5V≤Vin–Vout≤10V, Iload=10mA to 1A* 1.225 1.250 1.275

Output voltage(Note1)(fixed) Vout

Vin=Vout+1.5V,Variator from nominal Vout -1.5 +1.5

%1.5V≤Vin–Vout≤10V, Iload=0mA to 1A,Variator from nominal Vout *

-2 +2

Vout=+1.2V -3 +2Output voltage accuracy(at wafer testing) Vout_acc Vin=Vout+1.5V, Iload=10mA -0.6 0 +0.6 %

Line regulation ΔVout/ΔVin Iload=10mA, 1.5V≤Vin–Vout≤10V * 0.040 0.238 %Load regulation(Note 1) ΔVout/ΔIout Vin=Vout+1.5V, Iload=10mA to 1A * 0.4 0.8 %Min.load current Il (min) Vin=+5V, Vadj=0V * 2 7 mAGND pin current Ignd Vin=Vout+1.5V, Iload=10mA to 1A * 3.5 6.0 mAAdjust pin current Iadj 1.5V≤Vin–Vout≤10V, Iload=10mA * 35 60 μACurrent limit Ilim Vin-Vout=1.5V * 1.0 1.5 2.0 ARipple rejection ratio(Note 2) RR Vin–Vout= 2.5V, Iload=1A 60 dB

Dropout voltage(Note 1, 3) Vdif Iload=1A * 1.2 1.4 V

Temperature coefficient ΔTop Vin–Vout=1.5V, Iload=10mA * 0.015 %/°COn-chip thermal limiting Tlim 150 °C

■Electrical characteristicsIload=0mA, Top=+25°C, unless otherwise noted.)

The “ * ” denotes the specifications which apply over the full temperature range: −40°C≤ Tj≤ +125°C.Note 1: Low duty pulse testing with Kelvin connections required.Note 2: 120Hz input ripple (Cadj for ADJ = 25μF).Note 3: ΔVout, ΔVref = 1%.

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1) Output voltage The ELM1117HH develops a 1.25V reference voltage between the output and the adjust terminal. By placing a resistor between these two terminals, a constant current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally, this current is chosen to be the specified minimum load current of 10mA. For fixed voltage devices R1 and R2 are included in the device.

■Application notes

2) Load regulation When the adjustable regulator is used, load regulation will be limited by the resistance of the wire connecting the regulator to the load. The data sheet specification for load regulation is measured at the output pin of the de-vice.

Vout = Vref × ( 1 + R2 / R1 ) + Iadj × R2

Figure 1: Basic adjustable regulator.

Best load regulation is obtained when the top of the resistor divider (R1) is tied directly to the output pin of the device not to the load. For fixed voltage, devices the top of R1 is internally connected to the output, and the ground pin can be connected to low side of the load. If R1 is connected to the load, Rp is multiplied by the di-vider ratio, the effective resistance between the regulator and the load would be: Rp × (1 + R2 / R1), Rp = Parasitic Line Resistance3) Input capacitor An input capacitor of 10μF or greater is recommended. Tantalum or aluminum electrolytic capacitors can be used for bypassing. Larger Values will improve ripple rejection by bypassing the input to the regulator.4) Ripple Rejection The curves for Ripple Rejection were generated using an adjustable device with the adjust pin bypassed. With a 25μF bypassing capacitor, 75dB ripple rejection is obtainable at any output level. The impedance of the adjust pin capacitor, at the ripple frequency, should be < R1. R1 is normally in the range of 100Ω to 200Ω. The size of the required adjust pin capacitor is the function of the input ripple frequency. At 120Hz, with R1=100Ω, the ad-just pin capacitor should be 13μF. For fixed voltage devices and adjustable devices without an adjust pin capaci-tor, the output ripple will increase as the ratio of the output voltage to the reference voltage (Vout / Vref).

ConnectR1 to Case

L

P

ConnectR2 to Load

Figure 2: Connections for best load regulation.

ELM1117HH Bipolar 1A LDO voltage regulator

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■Typical characteristics

Load Transient Response Line Transient Response

Load Regulation (Input Voltage = 5V) Line Regulation (Output Current = 100mA)

Output Voltage vs. Input Voltage Input Current vs. Input Voltage

ELM1117HH-33

3.314

3.315

3.316

3.317

3.318

3.319

3.32

3.321

5 7 9 11 13 15

Out

put V

olta

ge (V

)

Input Voltage (V)

1.8V

2.5V

3.3V

0

0.5

1

1.5

2

2.5

3

3.5

4

0 1 2 3 4 5 6

Out

put V

olta

ge (V

)

Input Voltage (V)

ELM1117HH-33

0

1

2

3

4

5

6

0 2 4 6 8 10 12 14 16

Inpu

t Cur

rent

(mA)

Input Voltage (V)

ELM1117HH-33

3.3143.3153.3163.3173.3183.319

3.323.3213.3223.3233.3243.325

0 0.2 0.4 0.6 0.8 1

Out

put V

olta

ge (V

)

Output Current (A)

ELM1117HH Bipolar 1A LDO voltage regulator

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Current Limit vs. Input Voltage Output Voltage vs. Temperature (3.3V)

Output Voltage vs. Temperature (2.5V) Output Voltage vs. Temperature (1.8V)

PSRR vs. Frequency

ELM1117HH-33

0

0.5

1

1.5

2

2.5

3

5 7 9 11 13 15

Curr

ent L

imit

(A)

Input Voltage (V)3.1

3.15

3.2

3.25

3.3

3.35

3.4

-50 -25 0 25 50 75 100 125

Out

put V

olta

ge (V

)

Temperature (°C)

1.65

1.7

1.75

1.8

1.85

1.9

1.95

-50 -25 0 25 50 75 100 125

Out

put V

olta

ge (V

)

Temperature (°C)

20

30

40

50

60

70

80

90

0.01 0.1 1 10 100

PSRR

(dB)

Frequency (KHz)

2.35

2.4

2.45

2.5

2.55

2.6

2.65

-50 -25 0 25 50 75 100 125

Out

put V

olta

ge (V

)

Temperature (°C)

ELM1117HH Bipolar 1A LDO voltage regulator