1 Introduction

The LM2653 switching regulator provides high efficiency 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 and 75 mΩ internal switches provide 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 7 µA.

The IC contains patented current sensing circuitry for current mode control. This feature eliminates the external current sensing required by other current-mode DC-DC converters.

The IC has a 300kHz fixed frequency internal oscillator. The high oscillator frequency allows the use of extremely small, low profile components.

The evaluation board can be obtained by ordering part number LM2653EVAL from your local Texas Instruments sales office, or TI's website at http://www.ti.com.