參數(shù)資料
型號(hào)： RT8803A
廠商： Richtek Technology Corporation
英文描述： 2/3-Phase PWM Controller for High-Density Power Supply
中文描述： 2/3-Phase PWM控制器的高密度電源
文件頁(yè)數(shù)： 1/27頁(yè)
文件大小： 553K
代理商： RT8803A
RT8803A
1
DS8803A-05 August 2007
www.richtek.com
All brandname or trademark belong to their owner respectively
2/3-Phase PWM Controller for High-Density Power Supply
General Description
The RT8803A is a 2/3-phase synchronous buck controller
specifically designed to power Intel
/ AMD next generation
microprocessors. It implements an internal 8-bit DAC that is
identified by VID code of microprocessor directly. RT8803A
generates VID table that conform to Intel
VRD10.x and
VRD11 core power with 6.25mV increments and 0.5%
accuracy.
RT8803A 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 at mass production.
Other features include over current protection, programmable
soft start, over voltage protection, and output offset setting.
RT8803A comes to a small footprint package with
VQFN-32L 5x5.
Features
z
5V Power Supply
z
2/3-Phase Power Conversion with Automatic Phase
Selection
z
8-bit VID Interface, Supporting Intel VRD11/VRD10.x
and AMD K8, K8_M2 CPUs
z
VR_HOT and VR_FAN Indication
z
Precision Core Voltage Regulation
z
Power Stage Thermal Balance by DCR Current
Sensing
z
Adjustable Soft-start
z
Over-Voltage Protection
z
Adjustable Frequency and Typical at 300kHz per
Phase
z
Power Good Indication
z
32-Lead VQFN Package
z
RoHS Compliant and 100% Lead (Pb)-Free
Applications
z
Intel
/AMD New generation microprocessor for Desktop
PC and Motherboard
z
Low Output Voltage, High power density DC-DC
Converters
z
Voltage Regulator Modules
Ordering Information
RT8803A
Pin Configurations
(TOP VIEW)
VQFN-32L 5x5
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.
Package Type
QV : VQFN-32L 5x5 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
PWM3
PWM2
PWM1
ISP1
ISP2
ISP3
VTT/EN
VR_Ready
FBRTN
FB
COMP
SS
VR_FAN
VR_HOT
T
D
R
O
A
I
I
I
V
V
V
V
V
V
V
V
1
2
3
4
5
6
7
21
20
19
18
17
16
15
8
9
10
11
12
14
13
28
27
26
25
24
22
23
32
31
30
29
GND
VID7
VDD
33
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RT8803A_11 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:2/3-Phase PWM Controller for High-Density Power Supply
RT8805 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Two Phase General Purpose PWM Controller
RT8805C 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Two Phase General Purpose PWM Controller
RT8805CGQV 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Two Phase General Purpose PWM Controller
RT8805CGQVA 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:Two Phase General Purpose PWM Controller
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