GENERAL DESCRIPTION

The ML4771 is a continuous conduction boost regulator designed for DC to DC conversion in multiple cell battery powered systems. Continuous conduction allows the regulator to maximize output current for a given inductor. The maximum switching frequency can exceed 200kHz, allowing the use of small, low cost inductors. The ML4771 is capable of start-up with input voltages as low as 1.8V, and the output voltage can be set anywhere between 3.0V and 5.5V by an external resistor divider connected to the SENSE pin.

FEATURES

■ Guaranteed full load start-up and operation at 1.8V input

■ Continuous conduction mode for high output current

■ Very low supply current (20µA output referenced) for micropower operation

■ Pulse Frequency Modulation and Internal Synchronous Rectification for high efficiency

■ Maximum switching frequency > 200kHz

■ Minimum external components

■ Low ON resistance internal switching FETs

■ Adjustable output voltage (3.0V to 5.5V)