LD2985AXX Datasheet, PDF (1/21 Pages) STMicroelectronics – Very low drop and low noise voltage regulator low ESR capacitors compatible, with inhibit function

LD2985Axx
LD2985Bxx
Very low drop and low noise voltage regulator low ESR
capacitors compatible, with inhibit function
Features
■ Very low dropout voltage (280 mV at 150 mA
and 7 mV at 1 mA load)
■ Very low quiescent current (2 mA typ. at 150
mA load and 80 µA at no load)
■ Output current up to 150 mA
■ Logic controlled electronic shutdown
■ Output voltage of 1.8, 2.5, 2.7, 2.8, 3, 3.3, 5 V
■ Internal current and thermal limit
■ Available in ± 1 % tolerance (at 25 °C, A
version)
■ Low output noise voltage 30 mVrms
■ Smallest package SOT23-5L
■ Temperature range: -40°C to 125 °C
Description
The LD2985A/Bxx is a 150 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
SOT23-5L
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.
Table 1. Device summary
A Version
LD2985AXX18
LD2985AXX25
LD2985AXX27
LD2985AXX28
LD2985AXX30
LD2985AXX33
LD2985AXX50
August 2008
Part numbers
B Version
LD2985BXX18
LD2985BXX25
LD2985BXX27
LD2985BXX28
LD2985BXX30
LD2985BXX33
LD2985BXX50
Rev 10
Output voltages
1.8 V
2.5 V
2.7 V
2.8 V
3.0 V
3.3 V
5.0 V
1/21
www.st.com
21