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ADVANCED INFORMATION
describes products that are in the planning or early design stage. Specifications may change in any manner without
notice. Contact Fairchild Semiconductor for current information.
A
www.fairchildsemi.com
Features
Output voltages 5V, 12V, 3.3V and 2.9V
>93% System efficency
6V to 30V operation
Independent output enable/disable
Global power-down for low power sleep mode
Description
The RC5011/RC5023 demonstration board is intended to
assist designers in developing an efficient, low cost power
system for notebook computers using the RC5011 and
RC5023 voltage regulator ICs. The demo board accepts an
input voltage from 6V to 30V for battery operation. Using
both regulators, the demo board outputs four unique voltages
required by most portable PC systems; 12V for flash bios,
5V for digital logic, 3.3V for RAM and other logic and 2.9V
for the CPU. Using synchronous operation on all but the 12V
output, the system can realize efficiencies in excess of 93%
for extended battery life. Independent output enable func-
tions as well as a global power-down allow for a
multitude of low power sleep modes.
Block Diagram
RC5011
RC5023
OSC
OSC
+2.9V
AC
DET
AC ON
System
Battery
6-22V
Power
Management
Unit
AC
EN12V
EN5V
EN5
EN3.3
EN2.9
AC
Docking
Adaptor
Low Bat
Bat
+12V
+12V (PCMCIA)
+5V (Disk)
+3.3V (Logic)
+2.9V (CPU)
+5V
+3.3V
5V
Switch
5V
LIN
V
REF
V
REF
V
BAT
RC5011/RC5023 Demonstration Board
Power S upply S olution for Notebook Computers
Rev. 0.5.1