RT9401A/B

RT9401A/B
5Bit VID Reference Generator
General Description
Features
The RT9401A/B are digital to analog converters which
generate a reference voltage for Intel VR10.x/AMD K8
z
RT9401A Support 5bit DAC Voltage Conforming to
Intel VRD10.x VID Table
5-bit VID code respectively. The parts are proposed to
pair with a series of RichTek’ s general purpose PWM
controllers dedicated for the desktop microprocessor core
power voltage regulation. The reference voltage is within
1% high accuracy. These parts use a small footprint
package of SOT-23-8.
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RT9401B Support 5bit DAC Voltage Conforming to
AMD K8 VID Table
1% High Accuracy of VREF
Small Footprint Package of SOT-23-8
RoHS Compliant and 100% Lead (Pb)-Free
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Applications
Configurations
Richtek products are :
`
VID0
Note :
8
7
6
5
2
3
4
VDD
(TOP VIEW)
GND
Lead Plating System
P : Pb Free
Pin
G : Green (Halogen Free and Pb Free)
K8
VR10.X
VDA
z
VID4
Package Type
V8 : SOT-23-8
Desktop/Motherboard Microprocessor Core Power
Regulation
High Accuracy and Programmable Voltage Power
Regulation
VID1
z
RT9401A/B
VID3
Ordering Information
RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
VID2
`
Marking Information
SOT-23-8
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Typical Application Circuit
RT9401A/B
1
2
3
4
5V
VID2
VID3
VID1
VID4
VDA
GND
VDD
VID0
8
7
6
5
CL
DS9401A/B-08 April 2011
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RT9401A/B
Function Block Diagram
VDD
VID4
VID3
VID2
VID
Input
VID1
MUX
VID0
+
-
VDA
VREF
Functional Pin Description
Pin Number Pin Name Pin Function
1
VID2
DAC Voltage Identification Inputs.
2
VID1
DAC Voltage Identification Inputs.
3
VDA
Digital - to - Analog Voltage Output.
4
VDD
Power Input Pin.
5
VID0
DAC Voltage Identification Inputs.
6
GND
Ground.
7
VID4
DAC Voltage Identification Inputs.
8
VID3
DAC Voltage Identification Inputs.
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2
DS9401A/B-08 April 2011
RT9401A/B
Absolute Maximum Ratings
z
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(Note 1)
Supply Input Voltage, VDD ------------------------------------------------------------------------------------------- 7V
Power Dissipation, PD @ TA = 25°C
SOT-23-8 ---------------------------------------------------------------------------------------------------------------- 0.4W
Package Thermal Resistance (Note 2)
SOT-23-8, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260°C
Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
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(Note 4)
Supply Input Voltage, VDD ------------------------------------------------------------------------------------------- 5V ±10%
Junction Temperature Range ---------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VDD = 5V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
--
2
5
mA
VDA ≥ 1V
-1
--
+1
%
VDA < 1V
-10
--
+10
mV
VID(4:0) Input Low
--
--
0.4
V
VID(4:0) Input High
1.05
--
--
V
18
--
--
μA
When select AMD CPU
2.2
2.4
2.5
V
When select Intel CPU
1
1.1
1.2
V
Capacitor Load Only
--
70
--
dB
VDD Supply Current
Nominal Supply Current
I DD
VDA open
Reference & DAC
Output Voltage Program
See Table 1 & Table 2
DAC Output Voltage Accuracy
VID[4:0] Internal Pull-High Current
Source Capability
VID[4:0] Internal Pull-High Voltage
Output Buffer
DC Gain
Bandwidth
GBW
CL=1nF
--
1.64
--
MHz
Slew Rate
SR
CL=0.1uF
--
9.5
--
mV/μs
Impedance
ROUT
60
--
110
Ω
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RT9401A/B
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. θJA is measured in the natural convection at T A = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
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DS9401A/B-08 April 2011
RT9401A/B
Table 1. Output Voltage Program (VR 10)
Pin Name
Nominal Output Voltage VDA
VID4
VID3
VID2
VID1
VID0
1
1
1
1
1
OFF
0
1
0
0
1
0.850V
0
1
0
0
0
0.875V
0
0
1
1
1
0.900V
0
0
1
1
0
0.925V
0
0
1
0
1
0.950V
0
0
1
0
0
0.975V
0
0
0
1
1
1.000V
0
0
0
1
0
1.025V
0
0
0
0
1
1.050V
0
0
0
0
0
1.075V
1
1
1
1
0
1.100V
1
1
1
0
1
1.125V
1
1
1
0
0
1.150V
1
1
0
1
1
1.175V
1
1
0
1
0
1.200V
1
1
0
0
1
1.225V
1
1
0
0
0
1.250V
1
0
1
1
1
1.275V
1
0
1
1
0
1.300V
1
0
1
0
1
1.325V
1
0
1
0
0
1.350V
1
0
0
1
1
1.375V
1
0
0
1
0
1.400V
1
0
0
0
1
1.425V
1
0
0
0
0
1.450V
0
1
1
1
1
1.475V
0
1
1
1
0
1.500V
0
1
1
0
1
1.525V
0
1
1
0
0
1.550V
0
1
0
1
1
1.575V
0
1
0
1
0
1.600V
Note: (1) 0 : Connected to GND
(2) 1 : Open
DS9401A/B-08 April 2011
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RT9401A/B
Table 2. Output Voltage Program (K8)
VID4
VID3
VID2
VID1
VID0
Nominal Output Voltage VDA
0
0
0
0
0
1.550
0
0
0
0
1
1.525
0
0
0
1
0
1.500
0
0
0
1
1
1.475
0
0
1
0
0
1.450
0
0
1
0
1
1.425
0
0
1
1
0
1.400
0
0
1
1
1
1.375
0
1
0
0
0
1.350
0
1
0
0
1
1.325
0
1
0
1
0
1.300
0
1
0
1
1
1.275
0
1
1
0
0
1.250
0
1
1
0
1
1.225
0
1
1
1
0
1.200
0
1
1
1
1
1.175
1
0
0
0
0
1.150
1
0
0
0
1
1.125
1
0
0
1
0
1.100
1
0
0
1
1
1.075
1
0
1
0
0
1.050
1
0
1
0
1
1.025
1
0
1
1
0
1.000
1
0
1
1
1
0.975
1
1
0
0
0
0.950
1
1
0
0
1
0.925
1
1
0
1
0
0.900
1
1
0
1
1
0.875
1
1
1
0
0
0.850
1
1
1
0
1
0.825
1
1
1
1
0
0.800
1
1
1
1
1
Shutdown
Note: (1) 0 : Connected to GND
(2) 1 : Open
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DS9401A/B-08 April 2011
RT9401A/B
Typical Operating Characteristics
Error Between VVID & VVDA
0.7
1.195
0.6
1.194
0.5
V VID - V VDA (%)
VVDA (V)
VVDA vs. Temperature
1.196
1.193
1.192
1.191
1.19
0.4
0.3
0.2
0.1
1.189
-40
-20
0
20
40
60
80
100
120
140
Temperature(°C)
0
0.85
0.975
1.1
1.225
1.35
1.475
1.6
VVID (V)
VID on the Fly Falling
VVDA = 1.3V to 1.0625V
No Load
VID on the Fly Rising
VVDA = 1.3V to 1.0625V
No Load
VDA (100mV/Div)
VDA (100mV/Div)
VID0 (1V/Div)
Time (25μs/Div)
DS9401A/B-08 April 2011
VID0 (1V/Div)
Time (25μs/Div)
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RT9401A/B
Outline Dimension
H
D
L
C
B
b
A
A1
e
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
1.000
1.450
0.039
0.057
A1
0.000
0.150
0.000
0.006
B
1.500
1.700
0.059
0.067
b
0.220
0.500
0.009
0.020
C
2.600
3.000
0.102
0.118
D
2.800
3.000
0.110
0.118
e
0.585
0.715
0.023
0.028
H
0.100
0.220
0.004
0.009
L
0.300
0.600
0.012
0.024
SOT-23-8 Surface Mount Package
Richtek Technology Corporation
Richtek Technology Corporation
Headquarter
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
5F, No. 95, Minchiuan Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)86672399 Fax: (8862)86672377
Email: [email protected]
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit
design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be
guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
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DS9401A/B-08 April 2011