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FAN5037
Adjustable Switching Regulator Controller
Features
High power switch-mode DC-DC controller can provide in excess of 13A Output voltage adjustable from 1.2V to 3.6V 85% efficiency Cumulative accuracy 3% over line, load, and temperature variations Overvoltage and short circuit protection Built-in soft start No overshoot at turn-on

Description
The FAN5037 is a high power, switch-mode DC-DC controller that provides efficient power for all low-voltage applications. This controller has a built-in Soft Start feature which offers system protection during power-up by reducing both inrush current and output overshoot. When combined with the appropriate external circuitry, the FAN5037 can deliver load currents as high as 13A at efficiencies as high as 88%. The FAN5037 can generate output voltages from 1.2V up to 3.6V using external resistors. The FAN5037 is designed to operate in a constant on-time control mode under all load conditions. Its accurate low TC reference eliminates the need for precision external components in order to achieve the tight tolerance voltage regulation required by many applications. Short circuit current protection is provided through the use of a current sense resistor, while overvoltage protection is provided internally.

Applications
I/O and AGP power for desktop computers High efficiency power for ASICs High efficiency power for DSPs Adjustable step-down power supplies

Block Diagram
5V
VCCA 2 IFBL 4

12V

5V

FAN5037

Feedback Control

IFBH 3 VCCP 8

CEXT 1

Oscillator

Digital Logic

7 DRV

Vout 1.20V Reference
VFB 5 GNDP 6

REV. 1.0.3 9/26/01

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FAN5037 DATASHEET