LD2981ABM30TR datasheet(1/23 Pages) STMICROELECTRONICS

Part #	LD2981ABM30TR

Description	Ultra low drop voltage regulators with inhibit low ESR output capacitors compatible

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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July 2008

Rev 14

1/23

23

LD2981ABxx

LD2981Cxx

Ultra low drop voltage regulators with inhibit

low ESR output capacitors compatible

Features

■ Stable with low ESR ceramic capacitors

■ Ultra low dropout voltage (0.17 V typ. at 100

mA load, 7 mV typ. at 1 mA load)

■ Very low quiescent current (80 µA typ. at no

load in on mode; max 1 µA in off mode)

■ Guaranteed output current up to 100mA

■ Logic-controlled electronic shutdown

■ Output voltage of 2.5; 3.0; 3.3; 5.0 V

■ Internal current and thermal limit

■ ± 0.75 % tolerance output voltage available (A

version)

■ Output low noise voltage 160 µVRMS

■ Temperature range: -40 to 125 °C

■ Smallest package SOT23-5L and SOT-89

■ Fast dynamic response to line and load

changes

Description

The LD2981AB/C series are 100 mA fixed-output

voltage regulator. The low drop-voltage and the

ultra low quiescent current make them suitable for

low noise, low power applications and in battery

powered systems.

The quiescent current in sleep mode is less than

1 µA when INHIBIT pin is pulled low. Shutdown

logic control function is available on pin n° 3 (TTL

compatible). This means that when thedevice is

used as local regulator, it is possible to put a part

of the board in standby, decreasing the total

power consumption. The LD2981AB/C is

designed to work with low ESR ceramic capacitor.

Typical applications are in cellular phone,

palmtop/laptop computer, personal digital

assistant (PDA), personal stereo, camcorder and

camera.

SOT-89

SOT23-5L

Table 1.

Device summary

Part numbers

Output voltage

AB Version

C Version

LD2981ABXX25

LD2981CXX25

2.5 V

LD2981ABXX30

LD2981CXX30

3.0 V

LD2981ABXX33

LD2981CXX33

3.3 V

LD2981ABXX50

LD2981CXX50

5.0 V

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