CS51313 Datasheet, PDF (1/20 Pages) Cherry Semiconductor Corporation – Synchronous CPU Buck Controller Capable of Implementing Multiple Linear Regulators

CS51313
Synchronous CPU Buck Controller
Capable of Implementing Multiple Linear Regulators
Description
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^2TM 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
+12V
+3.3V +3.3V
+5V
1200µF/10V
1200µF/10V
1µF
1200µF/10V
x3
VID0
VID1
VID2
VID3
VID4
OVP
V_REF
V_CC
GND
GATEH
GATEL
V_FB
V_OUT
PWRGD
COMP
C_OFF
0.1
µF
680pF
+12
0.01
18K
1%
µF
1µF
3+ 1
IRL3103S
2 - _LM358A
51K
1%
100K 1%
22.1K
1%
LM358A
5+
6-
100K
1%
7
102K
1%
FS70VSJ-03
FS70VSJ-03
1.2µH 3.3mΩ
0.1µF
10K
100Ω
510Ω
510Ω
1200µF/ 10V
x2
TIP 31
47µF
V_CORE
2.0V@19A
1200µF/10V
x5
PWRGD
VGTL+
1.5V@3A
VCLOCK
2.5V@1A
Features
s Synchronous Switching
Regulator Controller for CPU
V_CORE
s Dual N-Channel MOSFET
Synchronous Buck Design
s V^2TM 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
s V_CC Monitor Provides Under
Voltage Lockout
s OVP Output Monitors Regulator
Output
s Enable Through use of the
COMP pin
s +1.23V Reference Voltage
Available Externally
Package Options
16 Lead SO Narrow
VID0 ¹
VID1
VID2
VID3
V_REF
VID4
V_FB
V_OUT
COMP
C_OFF
PWRGD
OVP
GATE(L)
Gnd
GATE(H)
V_CC
V² is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
Rev. 3/11/99
1
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web Site: www.cherry-semi.com
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