LD1117AXX12 datasheet(1/29 Pages) STMICROELECTRONICS

Part #	LD1117AXX12

Description	Low drop fixed and adjustable positive voltage regulators

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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April 2008

Rev 20

1/29

29

LD1117Axx

Low drop fixed and adjustable positive voltage regulators

Features

■ Low dropout voltage

(1.15 V typ. @ IOUT = 1 A, 25 °C)

■ Very low quiescent current

(5 mA typ. @ 25 °C)

■ Output current up to 1 A

■ Fixed output voltage of: 1.2 V, 1.8 V, 2.5 V,

3.3 V

■ Adjustable version availability (VREL = 1.25 V)

■ Internal current and thermal limit

■ Only 10 µF for stability

■ Available in ± 2 % (at 25 °C) and 4 % in full

temperature range

■ High supply voltage rejection:

– 80 dB typ. (at 25 °C)

■ Temperature range: 0 °C to 125 °C

Description

The LD1117A is a low drop voltage regulator able

to provide up to 1 A of output current, available

even in adjustable version (VREF = 1.25 V).

Concerning fixed versions, are offered the

following Output Voltages: 1.2 V, 1.8 V, 2.5 V and

3.3 V. The device is supplied in: SOT-223, DPAK,

D²PAK/A and TO-220. Surface mount packages

optimize the thermal characteristics even offering

a relevant space saving effect. High efficiency is

assured by NPN pass transistor. Only a very

common 10 µF minimum capacitor is needed for

stability. Only chip trimming allows the regulator to

reach a very tight output voltage tolerance, within

± 2 % at 25 °C.

SOT-223

D2PAK/A

TO-220

DPAK

Table 1.

Device summary

Part numbers

LD1117AXX12

LD1117AXX33

LD1117AXX18

LD1117AXX

LD1117AXX25

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