Features

• OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.
• Wide Input Supply Voltage Range: 2.5V to 6V
• High Efficiency: Up to 95%
• Low R_DS(ON) Internal Switch: 0.32ohms (V_IN = 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: I_Q = 165µA
• Ultralow Shutdown Current: I_Q = 0.5µA
• Peak Inductor Current Independent of Inductor Value
• Available in 14-Pin SO Package

Typical Application

Description

OBSOLETE:  For Information Purposes Only.  Contact Linear Technology for Potential Replacement.

The LTC1626 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 0.32ohms switch (V_IN = 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.

The inductor current is user-programmable via an external current sense resistor. In dropout, the internal P-channel MOSFET switch is turned on continuously, maximizing battery life.