CS51311
CS51311
Synchronous CPU Buck Controller
for 12V and 5V Applications
Description
The CS51311 is a synchronous dual
NFET Buck Regulator Controller. It is
designed to power the core logic of
the latest high performance CPUs. It
TM
uses the V
2
control method to
achieve the fastest possible transient
response and best overall regulation.
It incorporates many additional fea-
tures required to ensure the proper
operation and protection of the CPU
and Power system. The CS51311 pro-
vides the industry’s most highly inte-
grated solution, minimizing external
component count, total solution size,
and cost.
The CS51311 is specifically designed
to power Intel’s Pentium
®
II processor
and includes the following features:
5-bit DAC with 1.2% tolerance,
Power-Good output, over-current
hiccup mode protection, V
CC
monitor,
soft start, adaptive voltage position-
ing, adaptive FET non-overlap time,
and remote sense. The CS51311 will
operate over an 8.4V to 14V range
and is available in 14 lead narrow
body surface mount package.
Features
s
Synchronous Switching
Regulator Controller for
CPU V
CORE
s
Dual N-Channel MOSFET
Synchronous Buck Design
s
V
2
TM
Control Topology
s
200ns Transient Loop
Response
s
5-bit DAC with 1.2% Tolerance
s
Hiccup Mode Overcurrent
Protection
s
40ns Gate Rise and Fall Times
(3.3nF load)
s
65ns Adaptive FET
Non-overlap Time
s
Adaptive Voltage Positioning
s
Power-Good Output Monitors
Regulator Output
Application Diagram
+12V
+5V
s
V
CC
Monitor Provides Under
Voltage Lockout
s
Enable Through use of the
COMP pin
1µF
680pF
10K
1200µF/10V
x3
100Ω
0.01
µ
F
FS70VSJ-03
0.1
µ
F
C
OFF
COMP
V
CC
GATE(H)
GATE(L)
FS70VSJ-03
1.2µH
3.3mΩ
V
CC(CORE)
2.0V@19A
1200µF/10V
x5
Package Options
14 Lead SO Narrow
VID0
VID1
1
VID0
VID1
VID2
VID3
VID4
Gnd
PWRGD
510Ω
V
FB
V
OUT
0.1µF
510Ω
COMP
C
OFF
PWRGD
GATE(L)
Gnd
GATE(H)
V
CC
VID2
VID3
VID4
PWRGD
V
FB
V
OUT
V
2
is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev. 3/11/99
1
A
®
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
