LM2655MTCX-3.3

更新时间： 2024-11-23 04:44:39

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器开关
页数	文件大小	规格书
16页	770K
描述
2.5A High Efficiency Synchronous Switching Regulator

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LM2655MTCX-3.3 数据手册

April 2005

LM2655

2.5A High Efficiency Synchronous Switching Regulator

General Description

Features

n Ultra-high efficiency up to 96%

The LM2655 is a current-mode controlled PWM step-down

switching regulator. It has the unique ability to operate in

synchronous or asynchronous mode. This gives the de-

signer flexibility to choose between the high efficiency of

synchronous operation, or the low solution cost of asynchro-

nous operation. Along with flexibility, the LM2655 offers high

power density with the small footprint of a TSSOP-16 pack-

age.

n 4V to 14V input voltage range

n Internal high-side MOSFET with low R_DS(ON)= 0.033Ω

n 300 kHz fixed frequency internal oscillator

n Low-side drive for synchronous operation

n Guaranteed less than 12 µA shutdown current

n Patented current sensing for current mode control

n Programmable soft-start

High efficiency ( 90%) is obtained through the use of an

n Input undervoltage lockout

internal low ON-resistance (33mΩ) MOSFET, and an exter-

nal N-Channel MOSFET. This feature, together with its low

quiescent current, makes the LM2655 an ideal fit in portable

applications.

n Output overvoltage shutdown protection

n Output undervoltage shutdown protection

n Thermal Shutdown

n 16-pin TSSOP package

Integrated in the LM2655 are all the power, control, and drive

functions for asynchronous operation. In addition, a low-side

driver output allows easy synchronous operation. The IC

uses patented current sensing circuitry that eliminates the

external current sensing resistor required by other current-

mode DC-DC converters. A programmable soft-start feature

limits start up current surges and provides a means of se-

quencing multiple power supplies.

Applications

n Hard disk drives

n Internet appliances

n TFT monitors

n Computer peripherals

n Battery powered devices

Typical Application

10128429

DS101284

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