Datasheet > UM3501_15

UM3501_15

更新时间： 2024-11-27 01:22:35

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
11页	445K
描述
600mA, 1.2MHz, Synchronous Step-Down DC-DC Converter

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UM3501_15 数据手册

UM3501

600mA, 1.2MHz, Synchronous Step-Down DC-DC Converter

UM3501 SOT23-5

UM3501DA DFN6 2.0×2.0

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 R_DS(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 2.0×2.0

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



Cellular and Smart Phones

Microprocessors and DSP Core

Supplies

Wireless and DSL Modems

PDAs, GPS

MP3 Player



High Efficiency: Up to 90%

1.2MHz Constant Switching Frequency

600mA Output Current

Integrated Main Switch and Synchronous

Rectifier. No Schottky Diode Required

2.5V to 5.5V Input Voltage Range

Low Quiescent Current: 50µA

Thermal Fault Protection



Portable Instruments

<1µA Shutdown Current

Lead Free SOT23-5 Package and DFN6

2.0×2.0 Package

Typical Application Circuit

2.2uH

V_OUT1.8V

V_IN

VIN

634K

4.7uF

10uF

UM3501

GND

316K

________________________________________________________________________

http://www.union-ic.com Rev.06 Feb.2015 1/11

12 3 4 5 6 7...11

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