CS51311 Datasheet, PDF (1/19 Pages) Cherry Semiconductor Corporation – Synchronous CPU Buck Controller for 12V and 5V Applications

CS51311
Synchronous CPU Buck Controller
for 12V and 5V Applications
Description
Features
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
uses the V^2TM 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.
Application Diagram
+12V
+5V
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 Enable Through use of the
COMP pin
680pF
0.01
100Ω µF
0.1
µF
VID0
VID1
VID2
VID3
VID4
1µF
10K
C_OFF
COMP
V_CC
GATE(H)
GATE(L)
FS70VSJ-03
FS70VSJ-03
1200µF/10V
x3
1.2µH 3.3mΩ
V_FB
V_OUT
Gnd _PWRGD
0.1µF
510Ω
510Ω
PWRGD
V² is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
Rev. 3/11/99
1
V_CC(CORE)
2.0V@19A
1200µF/10V
x5
Package Options
14 Lead SO Narrow
VID0 1
VID1
VID2
VID3
VID4
V_FB
V_OUT
COMP
C_OFF
PWRGD
GATE(L)
Gnd
GATE(H)
V_CC
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: [phone] Fax: [phone]
Email: [e-mail]
Web Site: www.cherry-semi.com
A
® Company