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PDF CS5161 Data sheet ( Hoja de datos )
| Número de pieza | CS5161 | |
| Descripción | CPU 5-Bit Synchronous Buck Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CS5161, CS5161H
CPU 5−Bit Synchronous
Buck Controller
The CS5161/5161H are 5−bit synchronous dual N−Channel buck
controllers designed to provide unprecedented transient response for
today’s demanding high−density, high−speed logic. They operate
using a proprietary control method which allows a 100 ns response
time to load transients. The CS5161 is designed to operate over a
9−16 V range (VCC) using 12 V to power the IC and 5.0 V as the main
supply for conversion.
The CS5161H operates from a 12 V input as the main supply for
conversion using a discrete charge pump circuit to provide up to 20 V
for VCC2 and high side gate drive.
The CS5161/5161H are specifically designed to power
Pentium® III processors and other high performance core logic. They
include the following features: on board 5−bit DAC, short circuit
protection, 1.0% output tolerance, VCC monitor, and programmable
Soft Start capability. The CS5161/5161H are available in 16 pin
surface mount packages.
Features
• Dual N−Channel Design
• Excess of 1.0 MHz Operation
• 100 ns Transient Response
• 5−Bit DAC
• Backward Compatible with CS515X Family
• 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
• 50 ns FET Nonoverlap Time
• V2™ Control Topology
• Current Sharing
• Overvoltage Protection
http://onsemi.com
SO−16
D SUFFIX
CASE 751B
MARKING
DIAGRAMS
16
CS5161
AWLYWW
1
A
WL, L
YY, Y
WW, W
= Assembly Location
= Wafer Lot
= Year
= Work Week
PIN CONNECTIONS
VID0 1
VID1
VID2
VID3
SS
VID4
COFF
VFFB
VFB
COMP
LGnd
VVCGCAT1E(L)
PGnd
VGATE(H)
VCC2
ORDERING INFORMATION
Device
CS5161GD16
CS5161GDR16
CS5161HGD16
CS5161HGDR16
Package
Shipping
SO−16
SO−16
SO−16
SO−16
48 Units/Rail
2500 Tape & Reel
48 Units/Rail
2500 Tape & Reel
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 12
1
Publication Order Number:
CS5161/D
1 page  
CS5161, CS5161H
ELECTRICAL CHARACTERISTICS (continued) (0°C < TA < +70°C; CS5161: 0°C < TJ < +85°C; CS5161H: 0°C < TJ < +125°C;
9.5 V < VCC1 < 14 V; CS5161: 5.0 V < VCC2 < 16 V; CS5161H: 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 μF, unless otherwise specified.)
Characteristic
Test Conditions
Min Typ Max Unit
DAC
10100
−
3.0380 3.1000 3.1620
V
10011
−
3.1360 3.2000 3.2640
V
10010
−
3.2340 3.3000 3.3660
V
10001
−
3.3320 3.4000 3.4680
V
10000
−
3.4300 3.5000 3.5700
V
VGATE(H) and VGATE(L)
Out SOURCE Sat at 100 mA
Out SINK Sat at 100 mA
Out Rise Time
Measure VCC1 − VGATE(L); VCC2 − VGATE(H) − 1.2 2.0 V
Measure VGATE(H) − VPGnd; VGATE(L) − VPGnd
−
1.0
1.5
V
1.0 V < VGATE(H) < 9.0 V; 1.0 V < VGATE(L)
< 9.0 V; VCC1 = VCC2 = 12 V
− 30 50 ns
Out Fall Time
Delay VGATE(H) to VGATE(L)
9.0 V < VGATE(H) > 1.0 V; 9.0 V > VGATE(L)
> 1.0 V; VCC1 = VCC2 = 12 V
VGATE(H) falling to 2.0 V; VCC1 = VCC2 = 8.0 V
VGATE(L) rising to 2.0 V
−
20
30
50
50 ns
90 ns
Delay VGATE(L) to VGATE(H)
VGATE(L) falling to 2.0 V; VCC1 = VCC2 = 8.0 V
VGATE(H) rising to 2.0 V
20
50
90 ns
VGATE(H), VGATE(L) Resistance
VGATE(H), VGATE(L) Schottky
Resistor to LGnd. Note 3
LGnd to VGATE(H) @ 10 mA;
LGnd to VGATE(L) @ 10 mA
20 50 100 kΩ
− 600 800 mV
Supply Current
ICC1 No Switching
ICC2 No Switching
Operating ICC1
Operating ICC2
COFF
Normal Charge Time
Discharge Current
Time Out Timer
Time Out Time
−
−
VFB = COMP = VFFB
VFB = COMP = VFFB
VFFB = 1.5 V; VSS = 5.0 V
COFF to 5.0 V; VFB > 1.0 V
VFB = VCOMP; VFFB = 2.0 V;
Record VGATE(H) Pulse High Duration
− 9.5 14.5 mA
− 2.0 3.5 mA
− 9.0 14 mA
− 2.5 5.5 mA
1.0 1.6
5.0 −
2.2 μs
− mA
10 30
65 μs
Fault Mode Duty Cycle
VFFB = 0V
3. Guaranteed by design, not 100% tested in production.
35 50
70 %
http://onsemi.com
5
5 Page 
CS5161, CS5161H
latch. This causes the top MOSFET to shut off,
disconnecting the regulator from it’s input voltage. The Soft
Start capacitor is then slowly discharged by a 2.0 μA current
source until it reaches it’s lower 0.7 V threshold. The
regulator will then attempt to restart normally, operating in
it’s extended off time mode with a 50% duty cycle, while the
Soft Start capacitor is charged with a 60 μA charge current.
If the short circuit condition persists, the regulator output
will not achieve the 1.0 V low VFFB comparator threshold
before the Soft Start capacitor is charged to it’s upper 2.5 V
threshold. If this happens the cycle will repeat itself until the
short is removed. The Soft Start charge/discharge current
ratio sets the duty cycle for the pulses
(2.0 μA/60 μA = 3.3%), while actual duty cycle is half that
due to the extended off time mode (1.65%).
This protection feature results in less stress to the
regulator components, input power supply, and PC board
traces than occurs with constant current limit protection (see
Figures 12 and 13).
If the short circuit condition is removed, output voltage
will rise above the 1.0 V level, preventing the FAULT latch
from being set, allowing normal operation to resume.
M 50.0 μs
Trace 4− 5.0 V from PC Power Supply (2.0 V/div.)
Trace 2− Inductor Switching Node (2.0 V/div.)
Figure 13. CS5161/5161H Startup with Regulator
Output Shorted
Overvoltage Protection
Overvoltage protection (OVP) is provided as result of the
normal operation of the V2 control topology and requires no
additional external components. The control loop responds
to an overvoltage condition within 100 ns, causing the top
MOSFET to shut off, disconnecting the regulator from it’s
input voltage. The bottom MOSFET is then activated,
resulting in a “crowbar” action to clamp the output voltage
and prevent damage to the load (see Figures 14 and 15). The
regulator will remain in this state until the overvoltage
condition ceases or the input voltage is pulled low. The
bottom FET and board trace must be properly designed to
implement the OVP function.
M 25.0 ms
Trace 4− 5.0 V Supply Voltage (2.0 V/div.)
Trace 3− Soft Start Timing Capacitor (1.0 V/div.)
Trace 2− Inductor Switching Node (2.0 V/div.)
Figure 12. CS5161/5161H Hiccup Mode Short Circuit
Protection. Gate Pulses are Delivered While the Soft
Start Capacitor Charges, and Cease During Discharge
M 10.0 μs
Trace 4− 5.0 V from PC Power Supply (5.0 V/div.)
Trace 1− Regulator Output Voltage (1.0 V/div.)
Trace 2− Inductor Switching Node 5.0 V/div.)
Figure 14. CS5161/5161H OVP Response to an
Input−to−Output Short Circuit by Immediately
Providing 0% Duty Cycle, Crow−Barring the Input
Voltage to Ground
http://onsemi.com
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet CS5161.PDF ] | |
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