UM3510_16 Datasheet, PDF (1/13 Pages) Union Semiconductor, Inc. – 1A, 2.25MHz, Synchronous Step-Down DC-DC Converter

UM3510
1A, 2.25MHz, Synchronous Step-Down DC-DC Converter
UM3510S SOT23-6
UM3510DA DFN6 2.0×2.0
General Description
The UM3510 is a high efficiency pulse-width-modulated (PWM) synchronous step-down DC-DC
converter with an input voltage range of 2.5V to 6.0V. It provides up to 1000mA output current
from a single Li-ion cell. The UM3510 operates at 2.25MHz fixed switching frequency and enters
Power Save Mode to maintain high efficiency at light load condition.
For low noise applications, the device can be forced into fixed frequency PWM mode by pulling
the MODE pin high.
The UM3510 enters shutdown mode and consumes less than 1μA when EN pin is pulled low.
Other features include lower internal reference voltage with 2% accuracy, over temperature
protection and over current protection.
The UM3510 is available in SOT23-6 and 2mm×2mm 6-pin DFN packages.
Applications
Features
 Cellular and Smart Phones
 Microprocessors and DSP Core
Supplies
 Wireless and DSL Modems
 PDAs, GPS
 WLAN
 Portable Instruments
 High Efficiency: Up to 95%
 2.25MHz Constant Switching Frequency
 1000mA Output Current
 Integrated Main Switch and Synchronous
Rectifier. No Schottky Diode Required.
 2.5V to 6.0V Input Voltage Range
 Low Quiescent Current: 56µA
 Thermal Fault Protection
 <1µA Shutdown Current
Typical Application Circuit
V_IN 2.5V to 6V
C_IN
10µF
V_IN
SW
EN
UM3510
GND
FB
MODE
L1
2.2µH
R1
360kΩ
R2
180kΩ
V_OUT 1.8V,
1000mA
C1
22pF
C_OUT
10µF
Pin Configurations
Top View
FB 1
MODE 2
SW 3
6 EN
5 VIN
4 GND
6
5
4
UCB
1
2
3
M: Month Code
UM3510S
SOT23-6
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http://www.union-ic.com Rev.01 Jan.2016
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