Multiphase Switching Converters Comply With VRM Specifications

July 8, 2002
For powering next-generation microprocessors and high-end computing systems, Texas Instruments has readied 40-A, multiphase, fully integrated switching regulators. The PT8100 and PT8120 use a two-phase topology to provide a low-voltage,...

For powering next-generation microprocessors and high-end computing systems, Texas Instruments has readied 40-A, multiphase, fully integrated switching regulators.

The PT8100 and PT8120 use a two-phase topology to provide a low-voltage, high-current output with over 90% conversion efficiency. Their output voltages are programmable from 3.5 V down to 0.8 V via a 5-bit input code in compliance with Intel's VRM 8.4, 8.5, and 9.0 specifications.

While the PT8100 operates from either a 3.3- or 5.0-V input bus and supplies 40 A of output current, the PT8120 operates from a 12-V input bus and delivers 30 A of output current at output voltages as low as 0.8 V.

Designed to offer a fast transient response of 15 A/µs with a 50% load step, the power modules incorporate a number of features to facilitate system integration. These include short-circuit protection, thermal shutdown, output inhibit (on/off) control, soft start, and an output remote sense to compensate for the voltage drop between the regulator and the load.

Available in surface-mount, vertical through-hole, or horizontal through-hole 31-pin packages, the multiphase power modules cost $47.75 each in 1000-piece quantities.

Texas Instruments Inc., www.ti.com; (800) 477-8924, ext. 4500.

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