Datasheet > UM3429S

UM3429S

更新时间： 2024-11-24 01:11:35

品牌	Logo	应用领域
英联电子 - UNIONSEMI		/
页数	文件大小	规格书
12页	606K
描述
600mA, 1MHz, Synchronous Step-Up DC-DC Converter

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UM3429S 数据手册

UM3429

600mA, 1MHz, Synchronous Step-Up DC-DC Converter

UM3429S SOT23-6

UM3429DA DFN8 2.0×2.0

General Description

The UM3429 is synchronous rectified, fixed frequency, step-up DC/DC converter series

delivering high efficiency in low profile SOT23-6 and DFN8 2.0×2.0 packages. It features true

output load disconnection and adjustable output. With an internal NMOS switch, PMOS

synchronous rectifier and high switching frequency of 1MHz, the UM3429 is capable of

supplying 3.3V output at 100mA from a single AA cell input or 250mA from a 2-cell AA input

using low profile inductors and ceramic capacitors.

Current mode PWM control with internal compensation as well as the synchronous rectifier and

1MHz high frequency lead to the fewest number of external parts needed thereby saving BOM

cost and PCB area. At light load, UM3429 enters automatically into pulse skipping mode to keep

high efficiency. An internal resistor will be connected to V_INwhen the switch is idle that

eliminates switch ringing and reduces EMI interference.

The device also features low shutdown current lower than 1μA, inrush current limit.

Applications

Features



Digital Cameras



Up to 92% Efficiency

Output Load Disconnection

LCD Bias Supplies

Handheld Instruments

Wireless Handsets

GPS Receivers

Internal Synchronous Rectifier

Low Voltage Start-Up: 0.85V

Input Current Limit

Pulse Skipping Mode Operation with

Typical I_Qas 40μA



Shutdown Current Lower than 1µA

1MHz Switching Frequency for Low

Profile Inductor/Capacitor



Input Voltage: 0.5V to 5.0V

Output Voltage: 2.5V to 5.5V

Anti-Ringing Control to Reduce EMI

Typical Application Circuit

Efficiency vs. Output Current

Efficiencyvs. Load Current

100

V_OUT=3.3V

4.7µH

V_OUT

3.3V

250mA

V_IN

V_OUT

4.7µF

2-CELL

UM3429

10µF

SHDN

OFF ON

220k

GND

V_IN=1.2V

IN=1.2V

IN=1.5V

V_IN=1.5V

V_IN=2.4V

VIN=2.4V

V_IN=3.0V

VIN=3.0V

100

1000

OutputCurrent(mA)

________________________________________________________________________

http://www.union-ic.com Rev.02 Mar.2016 1/12

12 3 4 5 6 7...12

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