LM2655MTC-ADJ National Semiconductor, LM2655MTC-ADJ Datasheet

LM2655MTC-ADJ

Manufacturer Part Number

LM2655MTC-ADJ

Description

IC,SMPS CONTROLLER,CURRENT-MODE,BIPOLAR/MOS,TSSOP,16PIN,PLASTIC

Manufacturer

National Semiconductor

Datasheets

1.LM2655MTCX-ADJ.pdf (16 pages)

2.LM2655MTC-ADJ.pdf (16 pages)

Specifications of LM2655MTC-ADJ

Rohs Compliant

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LM2655

2.5A High Efficiency Synchronous Switching Regulator

General Description

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.

High efficiency (

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.

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.

Typical Application

90%) is obtained through the use of an

DS101284

Features

n Ultra-high efficiency up to 96%

n 4V to 14V input voltage range

n Internal high-side MOSFET with low R

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

n Input undervoltage lockout

n Output overvoltage shutdown protection

n Output undervoltage shutdown protection

n Thermal Shutdown

n 16-pin TSSOP package

Applications

n Hard disk drives

n Internet appliances

n TFT monitors

n Computer peripherals

n Battery powered devices

10128429

DS(ON)

www.national.com

= 0.033Ω

April 2005

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