LD2981 Datasheet, PDF (1/17 Pages) STMicroelectronics – VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT

LD2981
SERIES
ULTRA LOW DROP VOLTAGE REGULATORS WITH INHIBIT
LOW ESR OUTPUT CAPACITORS COMPATIBLE
s STABLE WITH LOW ESR CERAMIC
CAPACITORS
s ULTRA LOW DROPOUT VOLTAGE (0.17V
TYP. AT 100mA LOAD, 7mV TYP. AT 1mA
LOAD)
s VERY LOW QUIESCENT CURRENT (80µA
TYP. AT NO LOAD IN ON MODE; MAX 1µA
IN OFF MODE)
s GUARANTEED OUTPUT CURRENT UP TO
100mA
s LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
s OUTPUT VOLTAGE OF 1.5; 1.8; 2.5; 2.85;
3.0; 3.2; 3.3; 3.6; 3.8; 4.0; 4.7; 4.85; 5.0V
s INTERNAL CURRENT AND THERMAL LIMIT
s ± 0.75% TOLERANCE OUTPUT VOLTAGE
AVAILABLE (A VERSION)
s OUTPUT LOW NOISE VOLTAGE 160µVRMS
s TEMPERATURE RANGE: -40 TO 125°C
s SMALLEST PACKAGE SOT23-5L AND
SOT-89
s FAST DYNAMIC RESPONSE TO LINE AND
LOAD CHANGES
DESCRIPTION
The LD2981 series are 100mA fixed-output
voltage regulator. The low drop-voltage and the
SCHEMATIC DIAGRAM
SOT23-5L
SOT-89
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
1µA 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.
September 2003
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