LM2653

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SNVS050E – NOVEMBER 1999 – REVISED APRIL 2013

LM2653 1.5A High Efficiency Synchronous Switching Regulator

Check for Samples: LM2653

1

FEATURES

DESCRIPTION

The

LM2653

switching

regulator

provides

high

2

•

Efficiency up to 97%

efficient power conversion over a 100:1 load range

•

4V to 14V Input Voltage Range

(1.5A to 15 mA). This feature makes the LM2653 an

•

1.5V to 5.0V Adjustable Output Voltage

ideal fit in battery-powered applications.

•

0.1

Ω Switch On Resistance

Synchronous rectification is used to achieve up to

•

300 kHz Fixed Frequency Internal Oscillator

97% efficiency. At light loads, the LM2653 enters a

low power hysteretic or “sleep” mode to keep the

•

7

μA Shutdown Current

efficiency high. In many applications, the efficiency

•

Patented Current Sensing for Current Mode

still exceeds 80% at 15 mA load. A shutdown pin is

Control

available to disable the LM2653 and reduce the

•

Input Undervoltage Lockout

supply current to 7µA.

•

Output Overvoltage Shutdown Protection

All the power, control, and drive functions are

integrated within the ICs. The ICs contain patented

•

Output Undervoltage Shutdown Protection

current sensing circuity for current mode control. This

•

Adjustable Soft-Start

feature

eliminates

the

external

current

sensing

•

Adjustable PGOOD Delay

resistor required by other current-mode DC-DC

•

Current Limit and Thermal Shutdown

converters.

The ICs have a 300 kHz fixed frequency internal

APPLICATIONS

oscillator. The high oscillator frequency allows the

use of extremely small, low profile components.

•

Webpad

•

Personal Digital Assistants (PDAs)

Protection features include thermal shutdown, input

undervoltage lockout, adjustable soft-start, cycle by

•

Computer Peripherals

cycle

current

limit,

output

overvoltage

and

•

Battery-Powered Devices

undervoltage protections.

•

Notebook Computer Video Supply

•

Handheld Scanners

•

GXM I/O and Core Voltage

•

High Efficiency 5V Conversion

Typical Application

Efficiency vs Load Current

Figure 1.

Figure 2.

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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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.