CS5151 Datasheet, PDF (1/14 Pages) Cherry Semiconductor Corporation – CPU 4-Bit Nonsynchronous Buck Controller

CS5151
CPU 4-Bit Nonsynchronous Buck Controller
Description
Features
The CS5151 is a 4-bit nonsyn-
chronous N-Channel buck con-
troller. It is designed to provide
unprecedented transient response
for today’s demanding high-densi-
ty, high-speed logic. The regulator
operates using a proprietary control
method, which allows a 100ns
response time to load transients.
The CS5151 is designed to operate
over a 4.25-16V range (V_CC) using
12V to power the IC and 5V as the
main supply for conversion.
The CS5151 is specifically designed
to power Pentium^® processors with
MMX™ Technology and other high
performance core logic. It includes
the following features: on board,
4-bit DAC, short circuit protection,
1.0% output tolerance, V_CC monitor,
and programmable soft start capa-
bility. The CS5151 is upwards com-
patible with the 5-bit CS5156, allow-
ing the mother board designer the
capability of using either the
CS5151 or the CS5156 with no
change in layout. The CS5151 is
available in 16 pin surface mount
and DIP packages.
Application Diagram
Switching Power Supply for core logic - Pentium^® processor with MMX™ Technology
12V
5V
V_ID0
V_ID1
V_ID2
V_ID3
330pF
0.1µF
1200µF/16V x 3
AlEl
V_CC1 VCC2
V_GATE
V_ID0
V_ID1
V_ID2
V_ID3
CS5151
C_OFF
PGnd
IRL3103
2µH
2.1V to 3.5V @ 13A
3
MBR735
1,2
1200µF/16V x 5
AlEl
0.1µF
SS
COMP
0.33µF
LGnd
V_FB
V_FFB
3.3k
100pF
s N-Channel Design
s Excess of 1MHz Operation
s 100ns Transient Response
s 4-Bit DAC
s Upward Compatible with
5-Bit CS5155/5156 and
Adjustable CS5120/5121
s 30ns Gate Rise/Fall Times
s 1% DAC Accuracy
s 5V & 12V Operation
s Remote Sense
s Programmable Soft Start
s Lossless Short Circuit
Protection
s V_CC Monitor
s Adaptive Voltage
Positioning
s V^2™ Control Topology
s Current Sharing
s Overvoltage Protection
Package Options
16 Lead SO Narrow & PDIP
V_ID0 1
V_ID1
V_ID2
V_ID3
SS
NC
C_OFF
V_FFB
V_FB
COMP
LGnd
V_CC1
NC
PGnd
V_GATE
V_CC2
V² is a trademark of Switch Power, Inc.
Pentium is a registered trademark and MMX is a trademark of Intel Corporation.
Rev. 1/5/99
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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