CS5156 Datasheet, PDF (1/14 Pages) Cherry Semiconductor Corporation – CPU 5-Bit Nonsynchronous Buck Controller

CS5156
CPU 5-Bit Nonsynchronous Buck Controller
Description
Features
The CS5156 is a 5-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 CS5156 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 CS5156 is specifically designed
to power Pentium^® II processors
and other high performance core
logic. It includes the following fea-
tures: on board, 5-bit DAC, short
circuit protection, 1.0% output tol-
erance, V_CC monitor, and pro-
grammable soft start capability. The
CS5156 is backwards compatible
with the 4-bit CS5151, allowing the
mother board designer the capabili-
ty of using either the CS5151 or the
CS5156 with no change in layout.
The CS5156 is available in 16 pin
surface mount and DIP packages.
Application Diagram
Switching Power Supply for core logic - Pentium^® II processor
12V
5V
V_ID0
V_ID1
V_ID2
V_ID3
V_ID4
330pF
0.1µF
1200µF/16V x 3
AlEl
V_CC1 VCC2
V_GATE
V_ID0
V_ID1
V_ID2
V_ID3
V_ID4
CS5156
C_OFF
PGnd
IRL3103
2µH
2
MBR1535CT
1,3
1.3V to 3.5V @ 13A
1200µF/16V x 5
AlEl
0.1µF
SS
COMP
0.33µF
LGnd
V_FB
V_FFB
3.3k
100pF
V² is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
s N-Channel Design
s Excess of 1MHz Operation
s 100ns Transient Response
s 5-Bit DAC
s Backward Compatible with
4-Bit CS5150/5151 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
V_ID4
C_OFF
V_FFB
V_FB
COMP
LGnd
V_CC1
NC
PGnd
V_GATE
V_CC2
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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