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CS5157GDR16 데이터시트 PDF




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부품번호 CS5157GDR16 기능
기능 CPU 5-Bit Synchronous Buck Controller
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS5157GDR16 데이터시트, 핀배열, 회로
CS5157
CPU 5-Bit Synchronous Buck Controller
Description
Features
The CS5157 is a 5-bit synchronous
dual N-Channel buck controller. It
is designed to provide unprece-
dented transient response for
today’s demanding high-density,
high-speed logic. The regulator
operates using a proprietary control
method, which allows a 100ns
response time to load transients.
The CS5157 is designed to operate
over a 4.25-16V range (VCC) using
12V to power the IC and 5V as the
main supply for conversion.
The CS5157 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, VCC monitor, and pro-
grammable soft start capability. The
CS5157 is available in 16 pin surface
mount.
Application Diagram
Switching Power Supply for core logic - Pentium® II processor
12V 5V
s Dual N-Channel Design
s Excess of 1MHz Operation
s 100ns Transient Response
s 5-Bit DAC
s Backward Compatible with
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 VCC Monitor
s 25ns FET Nonoverlap Time
s V2TM Control Topology
s Current Sharing
s Overvoltage Protection
0.1µF
VID0
VID1
VID2
VID3
VID4
330pF
VCC1 VCC2 VGATE(H)
VID0
VID1
VID2
VID3
VID4
CS5157
VGATE(L)
COFF
PGnd
0.1µF
SS
COMP
0.33µF
LGnd
VFB
VFFB
3.3k
100pF
V2 is a trademark of Switch Power, Inc.
Pentium is a registered trademark of Intel Corporation.
Rev. 12/31/98
1200µF/10V x 3
AlEl
IRL3103
2µH
1.3V to 3.5V @ 13A
IRL3103
1200µF/10V x 5
AlEl
Package Options
16 Lead SO Narrow
VID0 1
VID1
VID2
VID3
SS
VID4
COFF
VFFB
VFB
COMP
LGnd
VCC1
VGATE(L)
PGnd
VGATE(H)
VCC2
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Web Site: www.cherry-semi.com
1 A ® Company




CS5157GDR16 pdf, 반도체, 판매, 대치품
Electrical Characteristics: 0°C < TA < +70°C; 0°C < TJ < +85°C; 8V < VCC1 < 14V; 5V < VCC2 < 14V; DAC Code: VID4 = VID2 = VID1
= VID0 = 1; VID3 = 0; CVGATE(L) and CVGATE(H) = 1nF; COFF = 330pF; CSS = 0.1µF, unless otherwise specified.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
s PWM Comparator
Transient Response
VFFB Bias Current
VFFB = 0 to 5V to VGATE(H) = 9V to 1V;
VCC1 = VCC2 = 12V
VFFB = 0V
100 125 ns
0.3 µA
s Supply Current
ICC1 No Switching
ICC2 No Switching
Operating ICC1
Operating ICC2
VFB = COMP = VFFB
VFB = COMP = VFFB
8.5 13.5 mA
1.6 3.0 mA
8 13 mA
2 5 mA
s COFF
Normal Charge Time
Extension Charge Time
Discharge Current
VFFB = 1.5V; VSS = 5V
VSS = VFFB = 0
COFF to 5V; VFB >1V
1.0 1.6 2.2 µs
5.0 8.0 11.0 µs
5.0 mA
s Time Out Timer
Time Out Time
Fault Mode Duty Cycle
VFB = VCOMP; VFFB = 2V;
Record VGATE(H) Pulse High Duration
VFFB = 0V
10
35
30 50 µs
50 65 %
Note 1: Guaranteed by design, not 100% tested in production.
PACKAGE PIN #
16L SO Narrow
1,2,3,4,6
5
7
8
9
10
PIN SYMBOL
Package Pin Description
FUNCTION
VID0 – VID4
SS
COFF
VFFB
VCC2
VGATE(H)
Voltage ID DAC input pins. These pins are internally pulled up to 5V
providing logic ones if left open. VID4 selects the DAC range. When VID4
is High (logic one), the DAC range is 2.10V to 3.50V with 100mV incre-
ments. When VID4 is Low (logic zero), the DAC range is 1.30V to 2.05V
with 50mV increments. VID0 - VID4 select the desired DAC output volt-
age. Leaving all 5 DAC input pins open results in a DAC output voltage
of 1.2440V, allowing for adjustable output voltage, using a traditional
resistor divider.
Soft Start Pin. A capacitor from this pin to LGnd in conjunction with
internal 60µA current source provides soft start function for the con-
troller. This pin disables fault detect function during Soft Start. When a
fault is detected, the soft start capacitor is slowly discharged by internal
2µA current source setting the time out before trying to restart the IC.
Charge/discharge current ratio of 30 sets the duty cycle for the IC when
the regulator output is shorted.
A capacitor from this pin to ground sets the time duration for the on
board one shot, which is used for the constant off time architecture.
Fast feedback connection to the PWM comparator. This pin is connected
to the regulator output. The inner feedback loop terminates on time.
Boosted power for the high side gate driver.
High FET driver pin capable of 1.5A peak switching current. Internal cir-
cuit prevents VGATE(H) and VGATE(L) from being in high state simultane-
ously.
4

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CS5157GDR16 전자부품, 판매, 대치품
Applications Information: continued
normal off time will ensue. The PWM comparator termi-
nates the switch on
capacitor. The V2TM
time, with off time set by the COFF
control loop will adjust switch duty
cycle as required to ensure the regulator output voltage
tracks the output of the error amplifier.
The soft start and COMP capacitors will charge to their
final levels, providing a controlled turn on of the regulator
output. Regulator turn on time is determined by the COMP
capacitor charging to its final value. Its voltage is limited
by the soft start COMP clamp and the voltage on the soft
start pin (see Figures 2 and 3).
Trace 1 - Regulator Output Voltage (5V/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Figure 4: CS5157 demonstration board enable startup waveforms.
Trace 1 - Regulator Output Voltage (1V/div.)
Trace 2 - Inductor Switching Node (2V/div.)
Trace 3 - 12V input (VCC1 and VCC2) (5V/div.)
Trace 4 - 5V Input (1V/div.)
Figure 2: CS5157 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.
Normal Operation
During normal operation, switch off time is constant and
sVe2tTMbycotnhteroClOlFoFocpatpoamcitaoirn.tSawinitrcehguolnattiiomne.
is adjusted by
This results in
the
changes in regulator switching frequency, duty cycle, and
output ripple in response to changes in load and line.
Output voltage ripple will be determined by inductor rip-
ple current working into the ESR of the output capacitors
(see Figures 5 and 6).
Ch1 High
2.80V
Trace 1 - Regulator Output Voltage (10mV/div.)
Trace 2 - Inductor Switching Node (5V/div.)
Trace 1 - Regulator Output Voltage (1V/div.)
Trace 3 - COMP Pin (error amplifier output) (1V/div.)
Trace 4 - Soft Start Pin (2V/div.)
Figure 5: Peak-to-peak ripple on VOUT = 2.8V, IOUT = 0.5A (light load).
Figure 3: CS5157 demonstration board startup waveforms.
If the input voltage rises quickly, or the regulator output is
enabled externally, output voltage will increase to the level
set by the error amplifier output more rapidly, usually
within a couple of cycles (see Figure 4).
7

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관련 데이터시트

부품번호상세설명 및 기능제조사
CS5157GDR16

CPU 5-Bit Synchronous Buck Controller

Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

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