LM2651MTC-1.8 National Semiconductor, LM2651MTC-1.8 Datasheet

LM2651MTC-1.8

Manufacturer Part Number

LM2651MTC-1.8

Description

1.5A High Efficiency Synchronous Switching Regulator

Manufacturer

National Semiconductor

Datasheet

1.LM2651MTC-1.8.pdf (10 pages)

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LM2651

1.5A High Efficiency Synchronous Switching Regulator

General Description

The LM2651 switching regulator provides high efficiency

power conversion over a 100:1 load range (1.5A to 15mA).

This

battery-powered applications that demand long battery life in

both run and standby modes.

Synchronous rectification is used to achieve up to 97% effi-

ciency. At light loads, the LM2651 enters a low power hyster-

etic or “sleep” mode to keep the efficiency high. In many ap-

plications, the efficiency still exceeds 80% at 15mA load. A

shutdown pin is available to disable the LM2651 and reduce

the supply current to less than 10µA.

The LM2651 contains a patented current sensing circuitry for

current mode control. This feature eliminates the external

current sensing resistor required by other current-mode

DC-DC converters.

The LM2651 has a 300 kHz fixed frequency internal oscilla-

tor. The high oscillator frequency allows the use of extremely

small, low profile components.

A programmable soft-start feature limits current surges from

the input power supply at start up and provides a simple

means of sequencing multiple power supplies.

Other protection features include input undervoltage lockout,

current limiting, and thermal shutdown.

Typical Application

feature

Efficiency vs Load Current

makes

= 5V, V

the

OUT

LM2651

= 3.3V)

DS100925

DS100925-15

ideal

fit

Features

n Ultra high efficiency up to 97%

n High efficiency over a 1.5A to milliamperes load range

n 4V to 14V input voltage range

n 1.8V, 2.5V, 3.3V, or ADJ output voltage

n Internal MOSFET switch with low R

n 300kHz fixed frequency internal oscillator

n 7µA shutdown current

n Patented current sensing for current mode control

n Input undervoltage lockout

n Adjustable soft-start

n Current limit and thermal shutdown

n 16-pin TSSOP package

Applications

n Personal digital assistants (PDAs)

n Computer peripherals

n Battery-powered devices

n Handheld scanners

n High efficiency 5V conversion

DS(on)

of 75m

February 2000

www.national.com

DS100925-1

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