Datasheet > AT1780

AT1780

更新时间： 2024-10-26 04:07:11

品牌	Logo	应用领域
AIMTRON		控制器
页数	文件大小	规格书
9页	327K
描述
640kHz/1.2MHz,Low-Noise Step-Up Current-Mode PWM Controller

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AT1780 数据手册

AT1780

Preliminary Product Information

640kHz/1.2MHz,Low-Noise Step-Up

Current-Mode PWM Controller

Features

General Description

• 1.6A,0.21Ω,14V Power MOSFET

• Operating input voltage:+2.6V to +5.5V

• Adjustable Output from V^INto 12V

• 640kHz /1.2MHz pin selectable switching

Frequency

The AT1780 is a current-mode step-up DC/DC

converter with a 1.6A, 0.21Ω power MOSFET.

The soft-start function is programmed with an

external capacitor, which sets the input current

ramp rate. It is ideal for generating bias voltages

for LCD panels. Pin selectable frequency 640KHz

or 1.2MHz operation results in a low noise output

that is easy to filter and faster loop performance.

An external compensation pin provides the user

flexibility in determining loop dynamics, allowing

the use of small, low equivalent series resistance

(ESR) ceramic output capacitors.

• 0.1μA shutdown Current

• Built-in Soft-Start function

• Small 8-Pin MSOP Package

Applications

• LCD Displays

• Digital Cameras

• Portable Applications

• Hand-Held Devices

*Protected by U.S. Patent # 6,791,368

Block Diagram

VIN

COMP

Reference

1.24V

4uA

Power

SOFT-

ON/OFF

SHDN

START

BIAS

Enable

Error

Amplifier

Comparator

1.24V

Clock

GND

Ramp

Oscillator

FSLC

Generator

CURRENT

SENSE

Aimtron reserves the right without notice to change this circuitry and specifications.

7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878 Fax: 886-3-563-0879

3/24/06 REV 1.1

WWW: http://www.aimtron.com.tw

Email: service@aimtron.com.tw

12 3 4 5 6 7...9

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