LD2981ABXX Datasheet, PDF (1/23 Pages) STMicroelectronics – Ultra low drop voltage regulators with inhibit low ESR output capacitors compatible

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 µV_RMS
■ Temperature range: -40 to 125 °C
■ Smallest package SOT23-5L and SOT-89
■ Fast dynamic response to line and load
changes
Description
SOT23-5L
SOT-89
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.
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
Table 1.
Device summary
Part numbers
AB Version
LD2981ABXX25
LD2981ABXX30
LD2981ABXX33
LD2981ABXX50
C Version
LD2981CXX25
LD2981CXX30
LD2981CXX33
LD2981CXX50
Output voltage
2.5 V
3.0 V
3.3 V
5.0 V
July 2008
Rev 14
1/23
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