LD2985 Datasheet, PDF (1/10 Pages) STMicroelectronics – VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION

UTC LD2985 LINEAR INTEGRATED CIRCUIT


VERY LOW DROP AND LOW
NOISE VOLTAGE REGULATOR
LOW ESR CAP. COMPATIBLE,
WITH INHIBIT FUNCTION
DESCRIPTION
The UTC LD2985 is a 150mA 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
1DŽA 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, CBYP=10nF, connected between
bypass pin and GND reduce the noise to 30DŽVrms.
Typical application are in cellular phone, palmtop
laptop computer, personal digital assistant (PDA),
personal stereo, camcorder and camera.
FEATURES
*VERY LOW DROPOUT VOLTAGE (280mV at 150mA
AND 7mV at 1mA LOAD)
*VERY LOW QUIESCENT CURRENT (2mA Typ. at
150mA LOAD AND 80DŽA at NO LOAD)
*OUTPUT CURRENT UP TO 150mA
*LOGIC CONTROLLED ELECTRONIC SHUTDOWN
*OUTPUT VOLTAGE OF 1.5, 1.8, 2.5, 2.8, 2.85, 3, 3.1,
3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V
*INTERNAL CURRENT AND THERMAL LIMIT
*AVAILABLE IN ± 1% TOLLERANCE (at 25Ċ, A
VERSION)
*LOW OUTPUT NOISE VOLTAGE 30DŽVrms
1
2
3
5
4
SOT-25
1:VIN
4:Bypass
2:GND
5:VOUT
3:INHIBIT
PIN DESCRIPTION
PIN PIN
NO. NAME
FUNCTION
1
IN Input Port
2
GND Ground Pin
Control switch ON/OFF.
Inhibit is not internally
pulled-up; it cannot be left
3 INHIBIT floating. Disable the device
when connected to GND or
to a positive voltage less
than 0.18V
Bypass Pin: Capacitor to
be connected to GND in
4 Bypass order to improve the
thermal noise
performances.
5
OUT Output Port
UTC UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R102-024,C