PWM Control IC Integrates MOSFET Drivers And Bootstrap Diode

The IR3640M PWM control IC is targeted at synchronous DC-DC buck applications such as servers, storage, game consoles, and general-purpose DC-DC converters. It’s a single-phase synchronous buck PWM controller with integrated MOSFET drivers and bootstrap diode. A single-loop voltage mode architecture helps simplify design while delivering precise output-voltage regulation and fast transient response. The IR3640M is designed to drive a pair of N-channel MOSFETs from 250-kHz to 1.5-MHz switching frequency, providing designers with the flexibility to optimize for efficiency or footprint. The output voltage can be regulated from as low as 0.7 V within a tolerance of +/-1% over temperature, line, and load variations. Other features include programmable soft start, pre-bias start up, voltage tracking, external synchronization, enable input, and Power Good output. Fault-protection is aided by thermal shutdown, over-voltage and over-current shutdown, and under-voltage lock out. A reference design kit is also available. Pricing for the ROHS-compliant IR3640MPbF begins at $0.44 each in 10,000-unit quantities. The IRDC3640 reference design kit costs $94. Production orders are available immediately. INTERNATIONAL RECTIFIER, El Segundo, CA. (310) 726-8000.