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| UM3501_15 Datasheet, PDF (1/11 Pages) Union Semiconductor, Inc. – 600mA, 1.2MHz, Synchronous Step-Down DC-DC Converter | |||
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UM3501
600mA, 1.2MHz, Synchronous Step-Down DC-DC Converter
UM3501 SOT23-5
UM3501DA DFN6 2.0Ã2.0
General Description
UM3501 is a high-efficiency pulse-width-modulated (PWM) step-down DC-DC converter,
capable of delivering 600mA output current over a wide input voltage range from 2.5V to 5.5V.
The target application of UM3501 is for portable electronic devices that are powered from 1-cell
Li-ion battery or from other power sources within the range such as cellular phones, PDAs and
handy-terminals. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction
loss at PWM mode. No external schottky diode is required in practical application. The UM3501
automatically turns off the synchronous rectifier while the inductor current is low and enters
discontinuous PWM mode. This can increase efficiency at light load condition.
UM3501 enter shutdown mode and consumes less than 0.1uA when EN pin is pulled low. The
operation frequency is set to 1.2MHz. This along with small SOT23-5 package and DFN6 2.0Ã2.0
package provides small PCB area application. Other features include lower internal reference
voltage with 2% accuracy, over temperature protection, and over current protection.
Applications
Features
ï¬ Cellular and Smart Phones
ï¬ Microprocessors and DSP Core
Supplies
ï¬ Wireless and DSL Modems
ï¬ PDAs, GPS
ï¬ MP3 Player
ï¬ Portable Instruments
ï¬ High Efficiency: Up to 90%
ï¬ 1.2MHz Constant Switching Frequency
ï¬ 600mA Output Current
ï¬ Integrated Main Switch and Synchronous
Rectifier. No Schottky Diode Required
ï¬ 2.5V to 5.5V Input Voltage Range
ï¬ Low Quiescent Current: 50µA
ï¬ Thermal Fault Protection
ï¬ <1µA Shutdown Current
ï¬ Lead Free SOT23-5 Package and DFN6
2.0Ã2.0 Package
Typical Application Circuit
VIN
C1
4.7uF
VIN
SW
UM3501
EN
FB
GND
L1
2.2uH
R2
634K
VOUT 1.8V
C3
10uF
R1
316K
________________________________________________________________________
http://www.union-ic.com Rev.06 Feb.2015
1/11
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