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PWM Controller. RT8857A Datasheet

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PWM Controller. RT8857A Datasheet






RT8857A Controller. Datasheet pdf. Equivalent




RT8857A Controller. Datasheet pdf. Equivalent





Part

RT8857A

Description

4/3/2/1-Phase PWM Controller



Feature


RT8857/A 4/3/2/1-Phase PWM Controller wi th Embedded Drivers for CPU Core Power Supply General Description The RT8857/A is a 4/3/2/1-phase synchronous buck co ntroller with 2 integrated MOSFET drive rs for Intel VR11.1/VR10.x and AMD K8/K 8_M2 CPUs power application. RT8857/A u ses differential inductor DCR current s ense to achieve phase current balance a nd active voltage .
Manufacture

Richtek

Datasheet
Download RT8857A Datasheet


Richtek RT8857A

RT8857A; positioning. Other features include adju stable operating frequency, adjustable soft start, power good indication, exte rnal error-amp compensation, over volta ge protection, over current protection, VRHOT sensing and IMON for various app lications. RT8857/A comes to a small fo otprint with WQFN-48L 7x7 package Feat ures      12V Power Sup ply Voltage 4/3/2/1-Phase Po.


Richtek RT8857A

wer Conversion 2 Embedded MOSFET Drivers Internal Regulated 5V Output VID table for INTEL VR11.1/VR10.x and AMD K8/ K8 _M2 CPUs Continuous Differential Induct or DCR Current Sense Adjustable Soft St art Adjustable Frequency Power Good Ind ication Adjustable Over Current Protect ion Over Voltage Protection VRHOT Sensi ng with External Thermistor IMON Output Current Indicatio.


Richtek RT8857A

n Power State Indicator (PSI) Support MO SFET Power Stage Input Voltage (VIN) Do wn to 5V (RT8857A Only) Small 48-Lead W QFN Package RoHS Compliant and Halogen Free       Ordering Information RT8857/A Package Type QW : WQFN-48L 7x7 (W-Type) Operating Temper ature Range G : Green (Halogen Free wit h Commercial Standard) Support VIN : 5/ 12V Support VIN : 12V Note : .

Part

RT8857A

Description

4/3/2/1-Phase PWM Controller



Feature


RT8857/A 4/3/2/1-Phase PWM Controller wi th Embedded Drivers for CPU Core Power Supply General Description The RT8857/A is a 4/3/2/1-phase synchronous buck co ntroller with 2 integrated MOSFET drive rs for Intel VR11.1/VR10.x and AMD K8/K 8_M2 CPUs power application. RT8857/A u ses differential inductor DCR current s ense to achieve phase current balance a nd active voltage .
Manufacture

Richtek

Datasheet
Download RT8857A Datasheet




 RT8857A
RT8857/A
4/3/2/1-Phase PWM Controller with Embedded Drivers
for CPU Core Power Supply
General Description
Features
The RT8857/A is a 4/3/2/1-phase synchronous buck
controller with 2 integrated MOSFET drivers for Intel
VR11.1/VR10.x and AMD K8/K8_M2 CPUs power
application. RT8857/A uses differential inductor DCR
current sense to achieve phase current balance and active
voltage positioning. Other features include adjustable
operating frequency, adjustable soft start, power good
indication, external error-amp compensation, over voltage
protection, over current protection, VRHOT sensing and
IMON for various applications. RT8857/A comes to a small
footprint with WQFN-48L 7x7 package
Ordering Information
RT8857/A
Package Type
QW : WQFN-48L 7x7 (W-Type)
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
12V Power Supply Voltage
4/3/2/1-Phase Power Conversion
2 Embedded MOSFET Drivers
Internal Regulated 5V Output
VID table for INTEL VR11.1/VR10.x and AMD K8/
K8_M2 CPUs
Continuous Differential Inductor DCR Current Sense
Adjustable Soft Start
Adjustable Frequency
Power Good Indication
Adjustable Over Current Protection
Over Voltage Protection
VRHOT Sensing with External Thermistor
IMON Output Current Indication
Power State Indicator (PSI)
Support MOSFET Power Stage Input Voltage (VIN)
Down to 5V (RT8857A Only)
Small 48-Lead WQFN Package
RoHS Compliant and Halogen Free
Support VIN : 5/12V
Support VIN : 12V
Pin Configurations
Note :
VIN is the input voltage of MOSFET power stage.
Richtek Green products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Applications
Desktop CPU Core Power
Low Voltage, High Current DC/ DC Converter
(TOP VIEW)
48 47 46 45 44 43 42 41 40 39 38 37
FBRTN 1
36
QR1 2
35
QR2 3
34
SS/EN 4
33
COMP 5
32
FB 6
OFS 7
GND
31
30
RT 8
29
ADJ 9
28
IMAX 10
IMAXPSI 11
49 27
26
IMONFB 12
25
PWRGD
BOOT1
UGATE1
PHASE1
LGATE1
VCC12
LGATE2
PHASE2
UGATE2
BOOT2
PWM3
PWM4
13 14 15 16 17 18 19 20 21 22 23 24
WQFN-48L 7x7
DS8857/A-00 February 2009
www.richtek.com
1
Free Datasheet http://www.datasheet.in/




 RT8857A
RT8857/A
Typical Application Circuit
www.richtek.com
2
DS8857/A-00 February 2009
Free Datasheet http://www.datasheet.in/




 RT8857A
RT8857/A
Table 1. VR11.1 VID CodeTable
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Voltage
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Voltage
0 0 0 0 0 0 0 0 OFF
0 0 1 0 0 0 1 1 1.39375
0 0 0 0 0 0 0 1 OFF
0 0 1 0 0 1 0 0 1.38750
0 0 0 0 0 0 1 0 1.60000
0 0 0 0 0 0 1 1 1.59375
0 0 1 0 0 1 0 1 1.38125
0 0 1 0 0 1 1 0 1.37500
0 0 0 0 0 1 0 0 1.58750
0 0 0 0 0 1 0 1 1.58125
0 0 1 0 0 1 1 1 1.36875
0 0 1 0 1 0 0 0 1.36250
0 0 0 0 0 1 1 0 1.57500
0 0 1 0 1 0 0 1 1.35625
0 0 0 0 0 1 1 1 1.56875
0 0 0 0 1 0 0 0 1.56250
0 0 1 0 1 0 1 0 1.35000
0 0 1 0 1 0 1 1 1.34375
0 0 0 0 1 0 0 1 1.55625
0 0 0 0 1 0 1 0 1.55000
0 0 0 0 1 0 1 1 1.54375
0 0 1 0 1 1 0 0 1.33750
0 0 1 0 1 1 0 1 1.33125
0 0 1 0 1 1 1 0 1.32500
0 0 0 0 1 1 0 0 1.53750
0 0 1 0 1 1 1 1 1.31875
0 0 0 0 1 1 0 1 1.53125
0 0 0 0 1 1 1 0 1.52500
0 0 1 1 0 0 0 0 1.31250
0 0 1 1 0 0 0 1 1.30625
0 0 0 0 1 1 1 1 1.51875
0 0 1 1 0 0 1 0 1.30000
0 0 0 1 0 0 0 0 1.51250
0 0 0 1 0 0 0 1 1.50625
0 0 1 1 0 0 1 1 1.29375
0 0 1 1 0 1 0 0 1.28750
0 0 0 1 0 0 1 0 1.50000
0 0 0 1 0 0 1 1 1.49375
0 0 1 1 0 1 0 1 1.28125
0 0 1 1 0 1 1 0 1.27500
0 0 0 1 0 1 0 0 1.48750
0 0 1 1 0 1 1 1 1.26875
0 0 0 1 0 1 0 1 1.48125
0 0 0 1 0 1 1 0 1.47500
0 0 1 1 1 0 0 0 1.26250
0 0 1 1 1 0 0 1 1.25625
0 0 0 1 0 1 1 1 1.46875
0 0 1 1 1 0 1 0 1.25000
0 0 0 1 1 0 0 0 1.46250
0 0 0 1 1 0 0 1 1.45625
0 0 1 1 1 0 1 1 1.24375
0 0 1 1 1 1 0 0 1.23750
0 0 0 1 1 0 1 0 1.45000
0 0 1 1 1 1 0 1 1.23125
0 0 0 1 1 0 1 1 1.44375
0 0 0 1 1 1 0 0 1.43750
0 0 1 1 1 1 1 0 1.22500
0 0 1 1 1 1 1 1 1.21875
0 0 0 1 1 1 0 1 1.43125
0 1 0 0 0 0 0 0 1.21250
0 0 0 1 1 1 1 0 1.42500
0 0 0 1 1 1 1 1 1.41875
0 1 0 0 0 0 0 1 1.20625
0 1 0 0 0 0 1 0 1.20000
0 0 1 0 0 0 0 0 1.41250
0 1 0 0 0 0 1 1 1.19375
0 0 1 0 0 0 0 1 1.40625
0 0 1 0 0 0 1 0 1.40000
0 1 0 0 0 1 0 0 1.18750
0 1 0 0 0 1 0 1 1.18125
To be continued
DS8857/A-00 February 2009
www.richtek.com
3
Free Datasheet http://www.datasheet.in/






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