July 2009 Doc ID 8188 Rev 7 1/17
17
LD2982BXX18
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 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
Description
The LD2982 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.
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.
SOT23-5L
Table 1. Device summary
Order code Output voltage
LD2982BM18R 1.8 V
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