PWM controllers are 1% accurate to simplify DC-DC power conversion

22 February 2006 Power Electronics / Power Management

International Rectifier offers two 1% accurate, single output, synchronous buck PWM controllers with 4,5 V to 16 V input voltage capability. The IR3637SPbF and IR3637ASPbF are compact and simple solutions for up to 15 A DC-DC point-of-load applications such as DDR memory, FPGAs, and video graphics processors.

The two PWM controllers in standard SO-8 package feature a 0,8 V, 1% accurate voltage reference. In next generation systems, peripheral rails can require as little as 3% total voltage error tolerance to ensure data signal integrity. The 1% accuracy allows designers to meet this stringent requirement. Both ICs include short-circuit protection, input under-voltage lockout, and an externally programmable soft-start function.

The IR3637SPbF operates at 400 kHz, suitable for output currents up to 15 A. The IR3637ASPbF runs at 600 kHz and provides optimum efficiency in applications requiring less than 7 A such as FPGAs. The 600 kHz frequency reduces required inductor size. Both PWM controllers are suitable for general purpose DC-DC conversion in a variety of other switching power supply applications.

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