LM2650

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SNVS133C – JUNE 1999 – REVISED APRIL 2013

LM2650 Synchronous Step-Down DC/DC Converter

Check for Samples: LM2650

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FEATURES

DESCRIPTION

The LM2650 is a step-down DC/DC converter

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•

Ultra High Efficiencies (95% possible)

featuring high efficiency over a 3A to milliamperes

•

High Efficiency Over a 3A to Milliamperes

load range. This feature makes the LM2650 an ideal

Load Range

fit in battery-powered applications that demand long

•

Synchronous Switching of Internal NMOS

battery life in both run and standby modes.

Power FETs

The

LM2650

also

features

a

logic-controlled

•

Wide Input Voltage Range (4.5V to 18V)

shutdown mode in which it draws at most 25

μA from

the input power supply.

•

Output Voltage Adjustable from 1.5V to 16V

•

Automatic Low-Power Sleep Mode

The LM2650 employs a fixed-frequency pulse-width

modulation (PWM) and synchronous rectification to

•

achieve very high efficiencies. In many applications,

25 µA)

efficiencies reach 95%+ for loads around 1A and

•

Frequency Adjustable up to 300 kHz

exceed 90% for moderate to heavy loads from 0.2A

•

Frequency Synchronization with External

to 2A.

Signal

A low-power hysteretic or "sleep" mode keeps

•

Programmable Soft-Start

efficiencies high at light loads. The LM2650 enters

and exits sleep mode automatically as the load

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Short-Circuit Current Limiting

crosses "sleep in" and "sleep out" thresholds. The

•

Thermal Shutdown

LM2650

provides

nodes

for

programming

both

•

Available in 24-lead Small-Outline Package

thresholds via external resistors. A logic input allows

the user to override the automatic sleep feature and

APPLICATIONS

keep the LM2650 in PWM mode regardless of the

load level.

•

Notebook and Palmtop Personal Computers

An optional soft-start feature limits current surges

•

Portable Data Terminals

from the input power supply at start up and provides

•

Modems

a simple means of sequencing multiple power

•

Portable Instruments

supplies.

•

Global Positioning Devices (GPSs)

•

Battery-Powered Digital Devices

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PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.