GENERAL DESCRIPTION

The ML4865 is a high voltage, 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 ML4865 is capable of start-up with input voltages as low as 1.8V and generates a 12V output with output voltage accuracy of ±4.

FEATURES

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

input

■ Continuous conduction mode for high output current

■ Very low quiescent current

■ Pulse frequency modulation and internal synchronous

rectification for high efficiency

■ Maximum switching frequency > 200kHz

■ Minimum external components

■ Low ON resistance internal switching FETs

■ Fixed 12V output can be adjusted to lower output

voltages