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PDF RT8857 Data sheet ( Hoja de datos )
| Número de pieza | RT8857 | |
| Descripción | 4/3/2/1-Phase PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8857 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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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/
1 page  
RT8857/A
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Voltage
1 0 0 0 1 1 1 0 0.72500
1 0 0 0 1 1 1 1 0.71875
1 0 0 1 0 0 0 0 0.71250
1 0 0 1 0 0 0 1 0.70625
1 0 0 1 0 0 1 0 0.70000
1 0 0 1 0 0 1 1 0.69375
1 0 0 1 0 1 0 0 0.68750
1 0 0 1 0 1 0 1 0.68125
1 0 0 1 0 1 1 0 0.67500
1 0 0 1 0 1 1 1 0.66875
1 0 0 1 1 0 0 0 0.66250
1 0 0 1 1 0 0 1 0.65625
1 0 0 1 1 0 1 0 0.65000
1 0 0 1 1 0 1 1 0.64375
1 0 0 1 1 1 0 0 0.63750
1 0 0 1 1 1 0 1 0.63125
1 0 0 1 1 1 1 0 0.62500
1 0 0 1 1 1 1 1 0.61875
1 0 1 0 0 0 0 0 0.61250
1 0 1 0 0 0 0 1 0.60625
1 0 1 0 0 0 1 0 0.60000
1 0 1 0 0 0 1 1 0.59375
1 0 1 0 0 1 0 0 0.58750
1 0 1 0 0 1 0 1 0.58125
1 0 1 0 0 1 1 0 0.57500
1 0 1 0 0 1 1 1 0.56875
1 0 1 0 1 0 0 0 0.56250
1 0 1 0 1 0 0 1 0.55625
1 0 1 0 1 0 1 0 0.55000
1 0 1 0 1 0 1 1 0.54375
1 0 1 0 1 1 0 0 0.53750
1 0 1 0 1 1 0 1 0.53125
1 0 1 0 1 1 1 0 0.52500
1 0 1 0 1 1 1 1 0.51875
1 0 1 1 0 0 0 0 0.51250
1 0 1 1 0 0 0 1 0.50625
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 Voltage
1 0 1 1 0 0 1 0 0.50000
1 1 1 1 1 1 1 0 OFF
1 1 1 1 1 1 1 1 OFF
DS8857/A-00 February 2009
www.richtek.com
5
Free Datasheet http://www.datasheet.in/
5 Page 
VID5
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
RT8857/A
Table 4. Output Voltage Program (K8_M2)
Pin Name
VID3
VID2
VID1
VID0
Nominal Output Voltage DACOUT
0000
1.5500
0001
1.5250
0010
1.5000
0011
1.4750
0100
1.4500
0101
1.4250
0110
1.4000
0111
1.3750
1000
1.3500
1001
1.3250
1010
1.3000
1011
1.2750
1100
1.2500
1101
1.2250
1110
1.2000
1111
1.1750
0000
1.1500
0001
1.1250
0010
1.1000
0011
1.0750
0100
1.0500
0101
1.0250
0110
1.0000
0111
0.9750
1000
0.9500
1001
0.9250
1010
0.9000
1011
0.8750
1100
0.8500
1101
0.8250
1110
0.8000
1111
0.7750
0000
0.7625
0001
0.7500
DS8857/A-00 February 2009
To be continued
www.richtek.com
11
Free Datasheet http://www.datasheet.in
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet RT8857.PDF ] | |
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