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Unisonic Technologies

L1923 Datasheet Preview

L1923 Datasheet

500mA HIGH PSRR LDO REGULATORS

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UNISONIC TECHNOLOGIES CO., LTD
L1923
Preliminary
500mA HIGH PSRR LDO
REGULATORS
CMOS IC
„ DESCRIPTION
5
The UTC L1923 is a low supply current, low dropout linear regulator.
It is operating at 2.5V - 5.5V. The supply current is as low as 55μA in
the no–load condition. In the shutdown mode, the maximum supply
current is less than 1μA.
A built-in over-temperature protection circuit is designed to protect
the device from being damaged by thermal overload. The over-current
protection limit is set at 800mA (TYP.)
The UTC L1923 can be operated on the following two modes. When
the SET pin is connected to ground, the output of L1923 is a pre-set
value and the external components are not needed to decide the
output voltage. When an output other than the preset value is needed,
two external resistors should be used as voltage dividers and then the
output voltage is decided by the resistor ratio.
The UTC L1923 is generally used in notebook computers, cellular
phones, PDAs, digital still camera and video recorders and other
hand-held devices.
„ FEATURES
* Low No-Load Supply Current: 90µA
* Guaranteed 500mA Output Current
* Dropout Voltage is 200mV @ 250mA Load
*OTP(Over-Temperature Protection) and Short-Circuit Protection
* Two Modes Of Operation:
Fixed Mode3.3V3.5V3.9V
Adjustable Mode: 1.25V - 5.5V
* Maximum Supply Current In Shutdown Mode is Less than 1µA
* Low Output Noise at 238µVRMS
* Stability with Lost Cost Ceramic Capacitors
„ ORDERING INFORMATION
Ordering Number
Package
L1923G-xx-AF5-R
SOT-25
Note: xx: Output Voltage, refer to Marking Information.
Packing
Tape Reel
L1923G-xx-AF5-R
www.DataSheet4U.com
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Halogen Free
(1) R: Tape Reel
(2) AF5: SOT-25
(3) xx: Refer to Marking Information
(4) G: Halogen Free
4
123
SOT-25
www.unisonic.com.tw
Copyright © 2010 Unisonic Technologies Co., Ltd
1 of 7
QW-R502-440.b




Unisonic Technologies

L1923 Datasheet Preview

L1923 Datasheet

500mA HIGH PSRR LDO REGULATORS

No Preview Available !

L1923
„ MARKING INFORMATION
PACKAGE
VOLTAGE CODE
SOT-25
33:3.3V
35:3.5V
39:3.9V
„ PIN CONFIGURATION
Preliminary
MARKING
SHDN 1
5 SET
CMOS IC
GND 2
IN 3
4 OUT
„ PIN DESCRIPTION
PIN NO.
1
2
3
4
5
PIN NAME
SHDN
GND
IN
OUT
SET
DESCRIPTION
Active-Low Shutdown Input. A logic low reduces the supply current to less than 1µA.
Connect to IN for normal operation.
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board
ground plane to maximize thermal dissipation.
Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 1µF to
GND
Regulator Output. Fixed or adjustable from 1.25V to +5.5V. Sources up to 500mA.
Bypass with a 4.7µF, 0.2typical ESR capacitor to GND.
Feedback Input for Setting the Output Voltage. Connect to GND to set the output
voltage to the preset output voltage. Connect to an external resistor divider for
adjustable-output operation.
www.DataSheet4U.com
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 7
QW-R502-440.b


Part Number L1923
Description 500mA HIGH PSRR LDO REGULATORS
Maker Unisonic Technologies
Total Page 7 Pages
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