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PDF CS5157H Data sheet ( Hoja de datos )
| Número de pieza | CS5157H | |
| Descripción | CPU 5-Bit Synchronous Buck Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CS5157H
CPU 5−Bit Synchronous
Buck Controller
The CS5157H is a 5−bit synchronous dual N−Channel buck
controller. It is designed to provide unprecedented transient response
for today’s demanding high−density, high−speed logic. The regulator
operates using a proprietary control method, which allows a 100 ns
response time to load transients. The CS5157H is designed to operate
over a 4.25−20 V range (VCC) using 12 V to power the IC and 5.0 V or
12 V as the main supply for conversion.
The CS5157H is specifically designed to power Pentium® II
processors and other high performance core logic. It includes the
following features: on board, 5−bit DAC, short circuit protection,
1.0% output tolerance, VCC monitor, and programmable Soft−Start
capability. The CS5157H is available in 16 pin surface mount.
Features
• Dual N−Channel Design
• Excess of 1.0 MHz Operation
• 100 ns Transient Response
• 5−Bit DAC
• 30 ns Gate Rise/Fall Times
• 1.0% DAC Accuracy
• 5.0 V and 12 V Operation
• Remote Sense
• Programmable Soft−Start
• Lossless Short Circuit Protection
• VCC Monitor
• 25 ns FET Nonoverlap Time
• V2t Control Topology
• Current Sharing
• Overvoltage Protection
• Pb−Free Packages are Available*
http://onsemi.com
16
1
SOIC−16
D SUFFIX
CASE 751B
MARKING DIAGRAM
16
CS5157HG
AWLYWW
1
CS5157H
A
WL
Y
WW
G
= Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
PIN CONNECTIONS
1
VID0
VID1
VID2
VID3
SS
VID4
COFF
VFFB
16
VFB
COMP
LGND
VCC1
VGATE(L)
PGND
VGATE(H)
VCC2
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2005
October, 2005 − Rev. 7
1
ORDERING INFORMATION
Device
Package
Shipping†
CS5157HGD16
SO−16
48 Units/Rail
CS5157HGD16G SO−16
(Pb−Free)
48 Units/Rail
CS5157HGDR16 SO−16 2500/Tape & Reel
CS5157HGDR16G SO−16 2500/Tape & Reel
(Pb−Free)
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
Publication Order Number:
CS5157H/D
1 page  
CS5157H
ELECTRICAL CHARACTERISTICS (0°C < TA < +70°C; 0°C < TJ < +125°C; 8.0 V < VCC1 < 14 V; 5.0 V < VCC2 < 20 V;DAC Code:
VID4 = VID2 = VID1 = VID0 = 1; VID3 = 0; CVGATE(L) and CVGATE(H) = 1.0 nF; COFF = 330 pF; CSS = 0.1 mF, unless otherwise specified.)
Characteristic
Test Conditions
Min Typ Max Unit
Supply Current
ICC1
ICC2
Operating ICC1
Operating ICC2
COFF
Normal Charge Time
Extension Charge Time
Discharge Current
Time Out Timer
No Switching
No Switching
VFB = COMP = VFFB
VFB = COMP = VFFB
VFFB = 1.5 V; VSS = 5.0 V
VSS = VFFB = 0
COFF to 5.0 V; VFB > 1.0 V
− 8.5 13.5 mA
− 1.6 3.0 mA
− 8.0 13 mA
− 2.0 5.0 mA
1.0 1.6 2.2 ms
5.0 8.0 11.0 ms
5.0 −
− mA
Time Out Time
Fault Mode Duty Cycle
VFB = VCOMP; VFFB = 2.0 V;
Record VGATE(H) Pulse High Duration
VFFB = 0V
10 30 65 ms
35 50 70 %
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
SOIC−16
1, 2, 3, 4, 6
PIN SYMBOL
VID0−VID4
FUNCTION
Voltage ID DAC input pins. These pins are internally pulled up to 5.0 V providing logic ones if left
open. VID4 selects the DAC range. When VID4 is High (logic one), the DAC range is 2.10 V to
3.50 V with 100 mV increments. When VID4 is Low (logic zero), the DAC range is 1.30 V to
2.05 V with 50 mV increments. VID0 − VID4 select the desired DAC output voltage. Leaving all
5 DAC input pins open results in a DAC output voltage of 1.2440 V, allowing for adjustable output
voltage, using a traditional resistor divider.
5 SS Soft−Start Pin. A capacitor from this pin to LGND in conjunction with internal 60 mA current
source provides Soft−Start function for the controller. This pin disables fault detect function
during Soft−Start. When a fault is detected, the Soft−Start capacitor is slowly discharged by
internal 2.0 mA 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.
7
COFF
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.
8
VFFB
Fast feedback connection to the PWM comparator. This pin is connected to the regulator output.
The inner feedback loop terminates on time.
9
VCC2
Boosted power for the high side gate driver.
10
VGATE(H)
High FET driver pin capable of 1.5 A peak switching current. Internal circuit prevents VGATE(H)
and VGATE(L) from being in high state simultaneously.
11
PGND
High current ground for the IC. The MOSFET driver is referenced to this pin. Input capacitor
ground and the source of lower FET should be tied to this pin.
12
VGATE(L)
Low FET driver pin capable of 1.5 A peak switching current.
13
VCC1
Input power for the IC and low side gate driver.
14
LGND
Signal ground for the IC. All control circuits are referenced to this pin.
15
COMP
Error amplifier compensation pin. A capacitor to ground should be provided externally to
compensate the amplifier.
16 VFB Error amplifier DC feedback input. This is the master voltage feedback which sets the output
voltage. This pin can be connected directly to the output or a remote sense trace.
http://onsemi.com
5
5 Page 
CS5157H
5.0 V
VOUT
CS5157H
R1
10 k
R3
10 k
PN3904
R2
6.2 k
Power Good
PN3904
M 5.00 ms
Trace 4− 5.0 V from PC Power Supply (2.0 V/div.)
Trace 1− Regulator Output Voltage (1.0 V/div.)
Figure 15. OVP Response to an Input−to−Output Short
Circuit by Pulling the Input Voltage to Ground
External Output Enable Circuit
On/off control of the regulator can be implemented
through the addition of two additional discrete components
(see Figure 16). This circuit operates by pulling the
Soft−Start pin high, and the VFFB pin low, emulating a short
circuit condition.
5.0 V
Shutdown
Input
MMUN2111T1 (SOT−23)
IN4148
5 SS
CS5157H
8 VFFB
Figure 16. Implementing Shutdown with the CS5157H
External Power Good Circuit
An optional Power Good signal can be generated through
the use of four additional external components (see
Figure 17). The threshold voltage of the Power Good signal
can be adjusted per the following equation:
VPower
Good
+
(R1
)
R2)
R2
0.65 V
This circuit provides an open collector output that drives
the Power Good output to ground for regulator voltages less
than VPower Good.
Figure 17. Implementing Power Good with the CS5157H
M 2.50 ms
Trace 3 − 12 V Input (VCC1) and (VCC2) (10 V/div.)
Trace 4− 5.0 V Input (2.0 V/div.)
Trace 1− Regulator Output Voltage (1.0 V/div.)
Trace 2− Power Good Signal (2.0 V/div.)
Figure 18. CS5157H Demonstration Board During
Power Up. Power Good Signal is Activated when
Output Voltage Reaches 1.70 V.
Selecting External Components
The CS5157H can be used with a wide range of external
power components to optimize the cost and performance of
a particular design. The following information can be used
as general guidelines to assist in their selection.
NFET Power Transistors
Both logic level and standard MOSFETs can be used. The
reference designs derive gate drive from the 12 V supply
which is generally available in most computer systems and
utilize logic level MOSFETs. Multiple MOSFETs may be
paralleled to reduce losses and improve efficiency and
thermal management.
Voltage applied to the MOSFET gates depends on the
application circuit used. Both upper and lower gate driver
outputs are specified to drive to within 1.5 V of ground when
in the low state and to within 2.0 V of their respective bias
supplies when in the high state. In practice, the MOSFET
gates will be driven rail to rail due to overshoot caused by the
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11
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| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet CS5157H.PDF ] | |
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