UM3500_16 Datasheet, PDF (1/11 Pages) Union Semiconductor, Inc. – 600mA, 1.5MHz, Synchronous Step-Down DC-DC Converter

UM3500
600mA, 1.5MHz, Synchronous Step-Down DC-DC Converter
UM3500 SOT23-5
General Description
The UM3500 is a 1.5MHz constant frequency, slope compensated current mode PWM step-down
converter. The device integrates a main switch and a synchronous rectifier for high efficiency
without an external Schottky diode. It is ideal for powering portable equipment that runs from a
single cell lithium-Ion (Li+) battery. The UM3500 can supply 600mA of load current from a 2.5V
to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The UM3500 can also
run at 100% duty cycle for low dropout operation, extending battery life in portable system. Pulse
Skipping Mode operation at light loads provides very low output ripple voltage for noise sensitive
applications.
The UM3500 is available in a low profile SOT23-5 package.
Applications
Features
 Cellular and Smart Phones
 Microprocessors and DSP Core
Supplies
 Wireless and DSL Modems
 PDAs, GPS
 MP3 Player
 Portable Instruments
 High Efficiency: Up to 96%
 1.5MHz Constant Switching Frequency
 600mA Output Current
 Integrated Main Switch and Synchronous
Rectifier. No External Schottky Diode.
 2.5V to 5.5V Input Voltage Range
 Output Voltage as Low as 0.6V
 100% Duty Cycle in Dropout
 Low Quiescent Current: 50µA
 Short Circuit Protection
 Thermal Fault Protection
 <1µA Shutdown Current
 Lead Free SOT23-5 Package
Pin Configurations
Top View
WW: Week Code
UM3500
SOT23-5
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http://www.union-ic.com Rev.04 May.2016
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