LD2982AXX Datasheet, PDF (1/20 Pages) STMicroelectronics – Very low drop and low noise voltage regulator with inhibit function, low ESR capacitors compatible

LD2982Axx
LD2982Bxx
Very low drop and low noise voltage regulator with
inhibit function, low ESR capacitors compatible
Features
■ Very low dropout voltage (120 mV at 50 mA
and 7 mV at 1 mA load)
■ Very low quiescent current (375 mA typ. at
50 mA load and 75 mA at 1 mA)
■ Output current up to 50 mA
■ Logic controlled electronic shutdown
■ Output voltage of 1.8, 2.7, 3.2, 3.3 V
■ Internal current and thermal limit
■ Available in ± 1 % tolerance
(at 25 °C, A version)
■ Supply voltage rejection: 45 dB (typ)
■ Only 1 µF for stability
■ Low output noise voltage 30 µVrms
■ Smallest package SOT23-5L
■ Temperature range: -40 °C to 125 °C
SOT23-5L
An external capacitor C_BYP = 10 nF connected
between bypass pin and GND reduce the noise
to 30 µVrms.
Typical application are in cellular phone,
palmtop/laptop computer, personal digital
assistant (PDA), personal stereo, camcorder and
camera.
Description
The LD2982A/Bxx is a 50 mA fixed output voltage
regulator. The ultra low drop voltage and the low
quiescent current make them particularly suitable
for low noise, low power applications, and in
battery powered systems. In sleep mode
quiescent current is less than 1 µA when INHIBIT
pin is pulled low. Shutdown logic control function
is available on pin 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.
Table 1. Device summary
A Version
LD2982AXX18
LD2982AXX27
LD2982AXX32
Part numbers
B Version
LD2982BXX18
LD2982BXX27
LD2982BXX32
Output voltage
1.8 V
2.7 V
3.2 V
July 2008
Rev 6
1/20
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