UM3510 Datasheet, PDF (1/10 Pages) Union Semiconductor, Inc. – 1.0A, 1.5MHz, Synchronous Step-Down DC-DC Converter

UM3510
1.0A, 1.5MHz, Synchronous Step-Down DC-DC Converter
UM3510 SOT23-5
General Description
The UM3510 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 UM3510 can supply 1.0A of load current
from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The
UM3510 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 UM3510 is available in a low profile SOT23-5 package.
Applications
z Cellular and Smart Phones
z Microprocessors and DSP Core
Supplies
z Wireless and DSL Modems
z PDAs, GPS
z MP3 Player
z Portable Instruments
Features
z High Efficiency: Up to 96%
z 1.5MHz Constant Switching Frequency
z 1.0A Output Current
z Integrated Main switch and synchronous
rectifier. No Schottky Diode Required
z 2.5V to 5.5V Input Voltage Range
z Output Voltage as Low as 0.6V
z 100% Duty Cycle in Dropout
z Low Quiescent Current: 200µA
z Slope Compensated Current Mode Control
for Excellent Line and Load Transient
Response
z Short Circuit Protection
z Thermal Fault Protection
z <1µA Shutdown Current
z Lead free SOT23-5 Package
Pin Configurations
Top View
UM3510
SOT23-5
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http://www.union-ic.com Rev.02 Dec.2011
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