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www.fairchildsemi.com
RC5231
CPU Voltage Regulator for Mobile PC’s
Features
S
ynchronous rectification
High precision
High efficiency
Voltage mode
6V to 20V input voltage range
±
10% current limit precision
TSSOP20
1.7V CPU and 1.8V CACHE
UVLO
OVP
Applications
Notebook and PDA PC’s
Hand-held portable instruments
Description
The RC5231 is a high efficiency and high precision DC/DC
controller for notebooks. The tightly controller current limit
threshold allows for a tight design of magnetics and discrete
transistors for minimum cost and space at maximum perfor-
mance.
Block Diagram
6-20V
9
8
12
13
14
15
16
17
18
19
20
1
11
10
4
5
3
2
6
7
D0
D1
ONOFF/SS
ONOFF/SS
Vcc =1.7V, 6.9A
Vccp =1.8V, 0.5A
PGOOD
FORCEPWM
RC5231
TSSOP20
D2
D3