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RT8802A Datasheet

  • RT8802A

  • 2/3/4/5-Phase PWM Controller for High-Density Power Supply

  • 28頁

  • RICHTEK   RICHTEK

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RT8802A
2/3/4/5-Phase PWM Controller for High-Density Power Supply
General Description
The RT8802A is a 2/3/4/5-phase synchronous buck controller
specifically designed to power Intel
廬
/ AMD next generation
microprocessors. It implements an internal 8-bit DAC that is
identified by VID code of microprocessor directly. RT8802A
generates VID table that conform to Intel
廬
VRD10.x and
VRD11 core power with 6.25mV increments and 0.5%
accuracy.
RT8802A adopts innovative time-sharing DCR current sensing
technique to sense phase currents for phase current balance,
load line setting and over current protection. Using a common
GM to sense all phase currents eliminates offset and linearity
variation between GMs in conventional current sensing
methods. As sub-milli-ohm-grade inductors are widely used
in modern motherboards, slight offset and linearity mismatch
will cause considerable current shift between phases. This
technique ensures good current balance
in mass
production.
Other features include over current protection, programmable
soft start, over voltage protection, and output offset setting.
RT8802A comes to a small footprint package with
VQFN-40L 6x6.
Features
5V Power Supply
2/3/4/5-Phase Power Conversion with Automatic
Phase Selection
8-bit VID Interface, Supporting Intel VRD11/VRD10.x
and AMD K8, K8_M2 CPUs
VR_HOT and VR_FAN Indication
Precision Core Voltage Regulation
Power Stage Thermal Balance by DCR Current
Sensing
Adjustable Soft-start
Over-Voltage Protection
Adjustable Frequency and Typical at 300kHz per
Phase
Power Good Indication
40-Lead VQFN Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Intel
廬
/AMD New generation microprocessor for Desktop
PC and Motherboard
Low Output Voltage, High power density DC-DC
Converters
Voltage Regulator Modules
Ordering Information
RT8802A
Package Type
QV : VQFN-40L 6x6 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Pin Configurations
(TOP VIEW)
VID_SEL
VID0
VID1
VID2
VID3
VID4
VID5
VID6
VID7
VDD
31
30
29
28
27
26
25
24
41
23
22
21
11 12 13 14 15 16 17 18 19 20
Note :
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.
40 39 38 37 36 35 34 33 32
VTT/EN
VR_Ready
FBRTN
FB
COMP
SS
QRSEL
VR_FAN
VR_HOT
TSEN
1
2
3
4
5
6
7
8
9
10
GND
PWM5
PWM4
PWM3
PWM2
PWM1
ISP1
ISP2
ISP3
ISP4
ISP5
IMAX
ISN1
ISN24
VQFN-40L 6x6
All brandname or trademark belong to their owner respectively
DS8802A-04 August 2007
www.richtek.com
1
ADJ
TCOC
ISN35
IOUT
DVD
RT
OFS

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