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
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.
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