Datasheet > UM3433

UM3433

更新时间： 2024-11-27 01:06:55

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
9页	500K
描述
600mA, 600kHz Step-Up DC-DC Converter

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UM3433 数据手册

UM3433

600mA, 600kHz Step-Up DC-DC Converter

UM3433 SOT23-6

General Description

The UM3433 is synchronous rectified, fixed frequency, step-up DC/DC converter series

delivering high efficiency in a low profile SOT23-6 package. It is available both in 3.3V/3.0V

fixed output and adjustable output. With an internal NMOS switch and PMOS synchronous

rectifier and high switching frequency of 600KHz, the UM3433 is capable of supplying 3.3V

output at 100mA from a single AA cell input using low profile inductors and ceramic capacitors.

Current mode PWM control with internal compensation cuts external parts count thereby saving

BOM cost and PCB real estate. At light loads, UM3433 enters automatically into power saving

mode to keep high efficiency at light load. Anti-ringing control circuitry inside reduces EMI

interferences by damping the inductor in discontinuous mode.

The device also features low shutdown current of under 1 μA. With inrush current limiting and

soft start built inside, it also limits the inrush of current during start up, minimizing surge currents

seen by the input supply.

Applications

Features

MP3 Players

Up to 92% efficiency

Digital Cameras

LCD Bias Supplies

Handheld Instruments

Wireless Handsets

GPS Receivers

z Low Voltage Start-Up: 0.9V

z Inrush current limiting and internal soft

start

Automatic Power-Saving Mode Operation

with typical IQ as 20μA

Short Circuit Protection

600kHz Switching Frequency for low

profile inductor/capacitor

Anti-ringing Control to minimizes EMI

Output range: 2.5V to 5V, with 3.3V/3.0V

fixed output option

Pin Configurations

Top View

UM3433-3.3 (UCR)

UM3433-3.0 (UDR)

UM3433-ADJ (UCS)

SOT23-6

(*: only available for adjustable version)

________________________________________________________________________

http://www.union-ic.com Rev.05 Dec.2009 1/9

12 3 4 5 6 7...9

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