DESCRIPTION
The LTC ®1626 is a monolithic, low voltage, step-down current mode DC/DC converter featuring Burst Mode™ operation at low output current.
The input supply voltage range of 2.5V to 6V makes the LTC1626 ideal for single cell Li-Ion and 3- or 4-cell NiCd/NiMH applications. A built-in 0.32Ω switch (VIN = 4.5V) allows up to 0.6A of output current.
The LTC1626 incorporates automatic power saving Burst Mode operation to reduce gate charge losses when the load current drops below the level required for continuous operation. With no load, the converter draws only 165µA. In shutdown, it draws a mere 0.5µA—making it ideal for current sensitive applications.

FEATURES
■ Wide Input Supply Voltage Range: 2.5V to 6V
■ High Efficiency: Up to 95%
■ Low RDS(ON) Internal Switch: 0.32Ω (VIN = 4.5V)
■ Current Mode Operation for Excellent Line and Load Transient Response
■ Short-Circuit Protected
■ Low Dropout Operation: 100% Duty Cycle
■ Built-In Low-Battery Detector
■ Low Quiescent Current at Light Loads: IQ = 165µA
■ Ultralow Shutdown Current: IQ = 0.5µA
■ Peak Inductor Current Independent of Inductor Value
■ Available in 14-Pin SO Package

APPLICATIONS
■ Single Cell Li-Ion Step-Down Converters
■ 3- or 4-Cell NiMH Step-Down Converters
■ Cellular Telephones
■ 5V to 3.3V Conversion
■ 3.3V to 2.5V Conversion
■ Inverting Converters
■ Portable Instruments