Features

 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 100 mA

 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

 Small package SOT23-5L and SOT-89

 Fast dynamic response to line and load

changes

Description

The LD2981 is a 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 the device is

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

of the board in standby, decreasing the total

power consumption. The LD2981 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