
1200
μ
F/10V
1200
μ
F/10V
GATEH
GATEL
V
FB
V
OUT
PWRGD
COMP
C
OFF
GND
+12
1%
IRL3103S
22.1K
100K
51K
1%
11%
47
μ
F
TIP 31
1200
μ
F/ 10V
x 2
102K
7
1200
μ
F/10V
x3
3.3m
1.2
μ
H
FS70VSJ-03
FS70VSJ-03
510
0.1
μ
F
510
V
CC
1
μ
F
1200
μ
F/10V
x5
V
CORE
2.0V@19A
PWRGD
5
6
+5V
+3.3V
+3.3V
+12V
VID0
VID1
VID2
VID3
VID4
VGTL+
1.5V@3A
VCLOCK
2.5V@1A
OVP
V
REF
LM358A
680pF
0.1
μ
F
1
μ
F
10K
0.01
μ
F
100
LM358A
3
2
1
1%
1%
1%
-
+
-
+
Features
I
Synchronous Switching
Regulator Controller for CPU
V
CORE
I
Dual N-Channel MOSFET
Synchronous Buck Design
I
V
2
TM
Control Topology
I
200ns Transient Loop Response
I
5-bit DAC with 1.2% Tolerance
I
Hiccup Mode Overcurrent
Protection
I
40ns Gate Rise and Fall Times
(3.3nF load)
I
65ns Adaptive FET Non-overlap
Time
I
Adaptive Voltage Positioning
I
Power-Good Output Monitors
Regulator Output
I
V
CC
Monitor Provides Under
Voltage Lockout
I
OVP Output Monitors Regulator
Output
I
Enable Through use of the
COMP pin
I
+1.23V Reference Voltage
Available Externally
Package Options
C
Synchronous CPU Buck Controller
Capable of Implementing Multiple Linear Regulators
Description
CS51313
The CS51313 is a synchronous dual
NFET Buck Regulator Controller. It is
designed to power the core logic of the
latest high performance CPUs. It uses the
V
2
TM
control method to achieve the
fastest possible transient response and
best overall regulation. It incorporates
many additional features required to
ensure the proper operation and protec-
tion of the CPU and Power system. The
CS51313 provides the industry’s most
highly integrated solution, minimizing
external component count, total solution
size, and cost.
The CS51313 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, overcurrent hiccup mode protec-
tion, over voltage protection, V
CC
moni-
tor, Soft Start, adaptive voltage position-
ing and adaptive FET non-overlap time.
A precision reference trimmed to 1% is
also externally available for use by other
regulators. The CS51313 will operate
over an 8.4V to 14V range and is avail-
able in 16 lead narrow body surface
mount package.
Application Diagram
1
V
OUT
VID0
VID1
VID2
VID3
V
REF
VID4
V
FB
COMP
C
OFF
PWRGD
V
CC
OVP
GATE(L)
GATE(H)
Gnd
16 Lead SO Narrow
1
Pentium is a registered trademark of Intel Corporation.
A
Company
V
2
is a trademark of Switch Power, Inc.
Rev. 3/11/99
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