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www.fairchildsemi.com
REV. 1.0.1
Features
High power switch-mode DC-DC controller can provide
in excess of 13A
Output voltage adjustable from 1.5V to 3.6V
85% efficiency
Cumulative accuracy < 3% over line, load, and
temperature variations
Overvoltage and short circuit protection
Built-in soft start
Applications
I/O and AGP power for desktop computers
High efficiency power for ASICs
High efficiency power for DSPs
Adjustable step-down power supplies
Description
The RC5037 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 RC5037 can deliver load
currents as high as 13A at efficiencies as high as 88%. The
RC5037 can generate output voltages from 1.5V up to 3.6V
using external resistors.
The RC5037 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 compo-
nents in order to achieve the tight tolerance voltage regula-
tion required by many applications. Short circuit current
protection is provided through the use of a current sense
resistor, while overvoltage protection is provided internally.
Block Diagram
Feedback Control
Oscillator
Digital Logic
RC5037
1.5V
Reference
Vout
+12V
5V
+5V
1
2
4
3
8
7
6
5
RC5037
Adjustable S witc hing Regulator Controller