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PDF RT8841 Data sheet ( Hoja de datos )
| Número de pieza | RT8841 | |
| Descripción | 4/3/2/1-Phase PWM Controller | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8841 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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Conceptual
RT8841
4/3/2/1-Phase PWM Controller for High-Density Power Supply
General Description
The RT8841 is a 4/3/2/1-phase synchronous buck
controller with 2 integrated MOSFET drivers for VR11 CPU
power application. RT8841 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 and enable/shutdown
for various applications. RT8841 comes to a small footprint
with WQFN-40L 6x6 package
Applications
z Desktop CPU Core Power
z Low Voltage, High Current DC/ DC Converter
Ordering Information
RT8841
Package Type
QW : WQFN-40L 6x6 (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
www.DNaotateSh:eet4U.com
Richtek Pb-free and 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.
`100% matte tin (Sn) plating.
Features
z 12V Power Supply Voltage
z 4/3/2/1-Phase Power Conversion
z 2 Embedded MOSFET Drivers
z Internal Regulated 5V Output
z VID Tables for Intel VRD11/VRD10.x and AMD K8,
K8_M2 CPUs
z Continuous Differential Inductor DCR Current Sense
z Adjustable Soft Start
z Adjustable Frequency
z Power Good Indication
z Adjustable Over Current Protection
z Over Voltage Protection
z Small 40-Lead WQFN Package
z RoHS Compliant and 100% Lead(Pb)-Free
Pin Configurations
(TOP VIEW)
40 39 38 37 36 35 34 33 32 31
VIDSEL 1
FBRTN 2
SS/EN 3
ADJ 4
COMP 5
FB 6
OFS 7
RT 8
IMAX 9
GND 10
30 BOOT1
29 UGATE1
28 PHASE1
27 LGATE1
GND
26 VCC12
25 LGATE2
24 PHASE2
23 UGATE2
41
22 BOOT2
21 PWM3
11 12 13 14 15 16 17 18 19 20
WQFN-40L 6x6
DS8841-02C September 2007
www.richtek.com
1
1 page  
Conceptual
RT8841
VID4 VID3
11
11
11
11
11
11
11
11
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
www.DataSh0eet4U.com 0
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
Table 1. Output Voltage Program (VRD10.x + VID6)
VID2
1
1
1
1
1
1
1
1
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
Pin Name
VID1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
VID0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
VID5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
VID6
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Nominal Output Voltage DACOUT
1.11250V
1.10625V
1.10000V
1.09375V
OFF
OFF
OFF
OFF
1.08750V
1.08125V
1.07500V
1.06875V
1.06250V
1.05625V
1.05000V
1.04375V
1.03750V
1.03125V
1.02500V
1.01875V
1.01250V
1.00625V
1.00000V
0.99375V
0.98750V
0.98125V
0.97500V
0.96875V
0.96250V
0.95625V
0.95000V
0.94375V
0.93750V
0.93125V
0.92500V
0.91875V
0.91250V
0.90625V
0.90000V
DS8841-02C September 2007
To be continued
www.richtek.com
5
5 Page 
Conceptual
RT8841
Table 3. Output Voltage Program (K8)
VID4
0
VID3
0
VID2
0
VID1
0
VID0
0
Nominal Output Voltage DACOUT
1.550
00001
1.525
00010
1.500
00011
1.475
00100
1.450
00101
1.425
00110
1.400
00111
1.375
01000
1.350
01001
1.325
01010
1.200
01011
1.275
01100
1.250
01101
1.225
01110
1.200
01111
1.175
10000
1.150
10001
1.125
10010
1.100
10011
1.075
10100
1.050
www.DataSheet4U.co1m 0 1 0 1
1.025
10110
1.000
10111
0.975
11000
0.950
11001
0.925
11010
0.900
11011
0.875
11100
0.850
11101
0.825
11110
0.800
11111
Note: (1) 0 : Connected to GND
(2) 1 : Open
Shutdown
DS8841-02C September 2007
www.richtek.com
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet RT8841.PDF ] | |
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