1FEATURES

2• Efficiency up to 97%

• 4V to 14V Input Voltage Range

• 1.5V to 5.0V Adjustable Output Voltage

• 0.1Ω Switch On Resistance

• 300 kHz Fixed Frequency Internal Oscillator

• 7 μA Shutdown Current

• Patented Current Sensing for Current Mode

Control

• Input Undervoltage Lockout

• Output Overvoltage Shutdown Protection

• Output Undervoltage Shutdown Protection

• Adjustable Soft-Start

• Adjustable PGOOD Delay

• Current Limit and Thermal Shutdown

APPLICATIONS

• Webpad

• Personal Digital Assistants (PDAs)

• Computer Peripherals

• Battery-Powered Devices

• Notebook Computer Video Supply

• Handheld Scanners

• GXM I/O and Core Voltage

• High Efficiency 5V Conversion

DESCRIPTION

The LM2653 switching regulator provides high

efficient power conversion over a 100:1 load range

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

ideal fit in battery-powered applications.

Synchronous rectification is used to achieve up to

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

low power hysteretic or “sleep” mode to keep the

efficiency high. In many applications, the efficiency

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

available to disable the LM2653 and reduce the

supply current to 7μA.

All the power, control, and drive functions are

integrated within the ICs. The ICs contain patented

current sensing circuity for current mode control. This

feature eliminates the external current sensing

resistor required by other current-mode DC-DC

converters.

The ICs have a 300 kHz fixed frequency internal oscillator. The high oscillator frequency allows the

use of extremely small, low profile components.

Protection features include thermal shutdown, input

undervoltage lockout, adjustable soft-start, cycle by

cycle current limit, output overvoltage and

undervoltage protections.