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PDF CS5151H Data sheet ( Hoja de datos )
| Número de pieza | CS5151H | |
| Descripción | CPU 4-Bit Nonsynchronous Buck Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CS5151H
CPU 4−Bit Nonsynchronous
Buck Controller
The CS5151H is a 4−bit nonsynchronous 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 CS5151H 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 CS5151H 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, VCC monitor, and
programmable Soft Start capability. The CS5151H is upwards
compatible with the 5−bit CS5156H, allowing the mother board
designer the capability of using either the CS5151H or the CS5156H
with no change in layout. The CS5151H is available in 16 pin surface
mount package.
Features
• N−Channel Design
• Excess of 1.0 MHz Operation
• 100 ns Transient Response
• 4−Bit DAC
• Upward Compatible with 5−Bit CS5155H/CS5156H
• 30 ns Gate Rise/Fall Times
• 1.0% DAC Accuracy
• 5.0 V & 12 V Operation
• Remote Sense
• Programmable Soft Start
• Lossless Short Circuit Protection
• VCC Monitor
• Adaptive Voltage Positioning
• V2™ Control Topology
• Current Sharing
• Overvoltage Protection
http://onsemi.com
MARKING
DIAGRAM
16
1
SOIC−16
D SUFFIX
CASE 751B
16
CS5151H
AWLYWW
1
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
1
VID0
VID1
VID2
VID3
SS
NC
COFF
VFFB
16 VFB
COMP
LGND
VCC1
NC
PGND
VGATE
VCC2
ORDERING INFORMATION
Device
CS5151HGD16
CS5151HGDR16
Package
Shipping
SO−16
SO−16
48 Units/Rail
2500 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 4
1
Publication Order Number:
CS5151H/D
1 page  
PACKAGE PIN #
16 Lead SO Narrow
1, 2, 3, 4
5
6, 12
7
8
9
10
11
13
14
15
16
CS5151H
PACKAGE PIN DESCRIPTION
PIN SYMBOL
VID0−VID3
SS
NC
COFF
VFFB
VCC2
VGATE
PGND
VCC1
LGND
COMP
VFB
FUNCTION
Voltage ID DAC input pins. These pins are internally pulled
up to 5.0 V providing logic ones if left open. The DAC range
is 2.14 V to 3.54 V with 100 mV increments. VID0 − VID3
select the desired DAC output voltage. Leaving all 4 DAC
input pins open results in a DAC output voltage of 1.244 V,
allowing for adjustable output voltage, using a traditional
resistor divider.
Soft Start Pin. A capacitor from this pin to LGND in conjunc-
tion with internal 60 μA current source provides Soft Start
function for the controller. This pin disables fault detect func-
tion during Soft Start. When a fault is detected, the Soft Start
capacitor is slowly discharged by internal 2.0 μA 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.
No Connection.
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 gate driver.
MOSFET driver pin capable of 1.5 A peak switching current.
High current ground for the IC. The MOSFET driver is refer-
enced to this pin. Input capacitor ground and the anode of
the Schottky diode should be tied to this pin.
Input power for the IC.
Signal ground for the IC. All control circuits are referenced to
this pin.
Error amplifier compensation pin. A capacitor to ground
should be provided externally to compensate the amplifier.
Error amplifier DC feedback input. This is the master voltage
feedback which sets the output voltage. This pin can be con-
nected directly to the output or a remote sense trace.
http://onsemi.com
5
5 Page 
CS5151H
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
CS5151H
8 VFFB
Figure 14. Implementing Shutdown with the CS5151H
External Power Good Circuit
An optional Power Good signal can be generated through
the use of four additional external components (see Figure
15). 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.
5.0 V
VOUT
CS5151H
R1
10 k
R3
10 k
PN3904
R2
6.2 k
Power Good
PN3904
Figure 15. Implementing Power Good with the CS5151H
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 16. CS5151H Demonstration Board During
Power Up. Power Good Signal is Activated when
Output Voltage Reaches 1.70 V.
Selecting External Components
The CS5151H 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
use logic level MOSFETs. A charge pump may be easily
implemented to permit use of standard MOSFETs or support
5.0 V or 12 V only systems (maximum of 20 V). 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. The gate driver output is specified
to drive to within 1.5 V of ground when in the low state and
to within 2.0 V of its bias supply when in the high state. In
practice, the MOSFET gate will be driven rail to rail due to
overshoot caused by the capacitive load it presents to the
controller IC. For the typical application where VCC1 =
VCC2 = 12 V and 5.0 V is used as the source for the regulator
output current, the following gate drive is provided;
VGATE + 12 V * 5.0 V + 7.0 V
(see Figure 17.)
http://onsemi.com
11
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| PDF Descargar | [ Datasheet CS5151H.PDF ] | |
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