CS5151 Cherry Semiconductor Corporation, CS5151 Datasheet

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CS5151

Manufacturer Part Number
CS5151
Description
Manufacturer
Cherry Semiconductor Corporation
Datasheet

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Switching Power Supply for core logic - Pentium
V
Pentium is a registered trademark and MMX is a trademark of Intel Corporation.
Rev. 1/5/99
330pF
2
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
12V to power the IC and 5V as the
main supply for conversion.
The CS5151 is specifically designed
to power Pentium
CPU 4-Bit Nonsynchronous Buck Controller
is a trademark of Switch Power, Inc.
0.1µF
V
V
V
V
ID0
ID1
ID2
ID3
0.33µF
V
V
V
V
V
C
SS
COMP
12V
®
CC1
ID0
ID1
ID2
ID3
OFF
processors with
V
CS5151
LGnd
CC2
CC
Description
Application Diagram
) using
V
PGnd
V
GATE
V
FFB
FB
0.1µF
100pF
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
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.
MBR735
3.3k
®
processor with MMX™ Technology
CS5151
5V
1,2
IRL3103
3
1200µF/16V x 3
AlEl
2µH
1
CC
2.1V to 3.5V @ 13A
1200µF/16V x 5
AlEl
monitor,
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Cherry Semiconductor Corporation
16 Lead SO Narrow & PDIP
Web Site: www.cherry-semi.com
N-Channel Design
Excess of 1MHz Operation
100ns Transient Response
4-Bit DAC
Upward Compatible with
5-Bit CS5155/5156 and
Adjustable CS5120/5121
30ns Gate Rise/Fall Times
1% DAC Accuracy
5V & 12V Operation
Remote Sense
Programmable Soft Start
Lossless Short Circuit
Protection
V
Adaptive Voltage
Positioning
V
Current Sharing
Overvoltage Protection
C
Email: info@cherry-semi.com
V
Package Options
V
V
V
V
OFF
NC
FFB
CC
2
SS
ID0
ID1
ID2
ID3
™ Control Topology
Monitor
Features
1
A
V
COMP
LGnd
V
NC
PGnd
V
V
®
FB
CC1
GATE
CC2
Company

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CS5151 Summary of contents

Page 1

... 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. ® processor with MMX™ Technology 5V 1200µ ...

Page 2

Pin Name .16V/-0.3V . ...

Page 3

Electrical Characteristics: 0°C < ID0 ID3 PARAMETER DAC: continued ID3 ID2 ID1 ID0 ...

Page 4

PACKAGE PIN # PIN SYMBOL 16L SO Narrow & PDIP 1,2,3,4 V – V ID0 OFF 8 V FFB 9 V CC2 10 V GATE 11 PGnd 13 V CC1 14 LGnd 15 ...

Page 5

V Monitor CC1 Comparator V CC1 - + 3.90V 3.85V SS V ID0 V ID1 Error 4 BIT Amplifier DAC + V ID2 V ID3 - Slow Feedback V FB COMP Fast Feedback V FFB LGnd 1V Theory of Operation ...

Page 6

... Trace 1 - Regulator Output Voltage (1V/div.) Trace 2 - Inductor Switching Node (2V/div.) Trace 3 - 12V input (V Trace Input (1V/div.) Figure 2: CS5151 demonstration board startup in response to increasing 12V and 5V input voltages. Extended off time is followed by normal off time operation when output voltage achieves regulation to the error amplifier output. ...

Page 7

... Figure 4). Trace 1 - Regulator Output Voltage (5V/div.) Trace 2 - Inductor Switching Node (5V/div.) Figure 4: CS5151 demonstration board enable startup waveforms. Normal Operation During normal operation, switch off time is constant and set by the C capacitor ...

Page 8

... Trace 1 - Regulator Output Voltage (1V/div.) Trace 3 - Regulator Output Current (20V/div.) Figure 7: CS5151 demonstration board response to a 0.5 to 13A load pulse (output set for 2.8V). Trace 1 - Regulator Output Voltage (1V/div.) Trace 2 - Inductor Switching Node (5V/div.) Trace 3 - Output Current (0 ...

Page 9

... Trace Supply Voltage (2V/div.) Trace 3 - Soft Start Timing Capacitor (1V/div.) Trace 2 - Inductor Switching Node (2V/div.) Figure 10: CS5151 demonstration board hiccup mode short circuit pro- tection. Gate pulses are delivered while the soft start capacitor charges, and cease during discharge. Trace from PC Power Supply (2V/div.) Trace 2 = Inductor Switching Node (2V/div ...

Page 10

... Applications Information: continued Channel GATE M1= V GATE Channel 2 = Inductor Switching Node Figure 15: CS5151 gate drive waveforms depicting rail to rail swing. The most important aspect of MOSFET performance is RDS , which effects regulator efficiency and MOSFET ON thermal management requirements. The power dissipated by the MOSFET and the Schottky diode may be estimated as follows ...

Page 11

C timing capacitor: OFF Period × duty cycle OFF 4848.5 where: 1 Period = switching frequency “Droop” Resistor for Adaptive Voltage Positioning Adaptive voltage positioning is used to reduce output volt- age excursions during abrupt changes ...

Page 12

R = TRACE I MAX This causes the output voltage to be +40mV with no load, and -40mV with a full load, improving regulator transient response. This trace must be wide enough to carry the full output current. (Typical ...

Page 13

... Tantalum 2 1,3 Connect to other circuits for current sharing 13 3.3V 12V + 33µF/25V x 3 Tantalum Si9410 CC2 CC1 GATE 5µH V ID0 V ID1 ID2 + CS5151 V ID3 2 MBR1535CT C OFF 1,3 SS PGnd 3.3k COMP V FFB LGnd 100pF 2.5V/7A 100µF/10V x 2 Tantalum ...

Page 14

... REF: JEDEC MS-012 8.26 (.325) 7.62 (.300) 3.68 (.145) 2.92 (.115) .356 (.014) .203 (.008) REF: JEDEC MS-001 Ordering Information Part Number Description CS5151GD16 16L SO Narrow CS5151GDR16 16L SO Narrow (tape & reel) CS5151GN16 16L PDIP Rev. 1/5/99 Package Specification D Thermal Data English R Min Max Min ΘJC R 9.80 .394 .386 Θ ...

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