UM17735 Datasheet, PDF (1/7 Pages) Union Semiconductor, Inc. – 500mA, Micropower, VLDO Linear Regulator

UM177XX
500mA, Micropower, VLDO Linear Regulator
UM177XX QFN2020-6
General Description
The UM177XX series are VLDO (very low dropout) linear regulators designed for low power
portable applications. Typical output noise is only 75μV_RMS and maximum dropout is just 400mV
at the load current of 500mA.The internal P-channel MOSFET pass transistor requires no base
current, allowing the device to draw only 100μA during normal operation at the maximum load
current of 500mA.
Other features include high output voltage accuracy, excellent transient response, under voltage
lockout, stability with ultra low ESR ceramic capacitors as small as 1μF, reverse-battery,
short-circuit and thermal overload protection and output current limiting.
The UM177XX series are available in a low profile QFN2020-6 package.
Applications
z Bluetooth/802.11 Cards
z PDAs and Notebook Computers
z Portable Instruments and
Battery-Powered Systems
z Cellular Phones
Features
z Very Low Dropout: 400mV(max) at 500mA
z Maximum Input Voltage: 6.0V
z Low Noise:75μV_RMS (10Hz to 100kHz)
z ±2.5%Voltage Accuracy at 500mA
z Fast Transient Response
z Under Voltage Lockout
z Fixed Output Voltage:
3.5V/3.3V/3.0V/2.8V/2.5V/1.8V/1.5V/1.3V/
1.2V
z Output Current Limit
z Reverse-Battery Protection
z No Protection Diodes Needed
z Stable with 1μF Output Capacitor
z Short-Circuit and Thermal Overload
Protection
z Low Profile QFN2020-6 Package
Pin Configurations
Top View
UM177XX
M: Month Code
QFN2020-6
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http://www.union-ic.com Rev.01 Sep.2010
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