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RT9401A/B
5Bit VID Reference Generator
General Description
The RT9401A/B are digital to analog converters which generate a reference voltage for Intel VR10.x/AMD K8 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.
Features
RT9401A Support 5bit DAC Voltage Conforming to Intel VRD10.x VID Table 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
Applications Ordering Information
RT9401A/B Package Type V8 : SOT-23-8
Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) K8 VR10.X
Note : RichTek Pb-free and Green products are : RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.
VID2 VID1 VDA
Desktop/Motherboard Microprocessor Core Power Regulation High Accuracy and Programmable Voltage Power Regulation
Pin Configurations
(TOP VIEW)
VID3 VID4 VID0 GND
8 1
7 2
6 3
5 4
VDD
Suitable for use in SnPb or Pb-free soldering processes. 100%matte tin (Sn) plating.
SOT-23-8
Marking Information
For marking information, contact our sales representative directly or through a RichTek distributor located in your area, otherwise visit our website for detail.
Note : There is no pin1 indicator on top mark for SOT-23-8 type, and pin 1 will be lower left pin when reading top mark from left to right.
Typical Application Circuit
RT9401A/B 1 2 3 5V CL 4 VID2 VID1 VDA VDD VID3 VID4 GND VID0 8 7 6 5
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Function Block Diagram
VDD
VID4 VID3 VID2 VID1 VID0 VID Input MUX + -
VDA
VREF
Functional Pin Description
Pin Number Pin Name Pin Function 1 2 3 4 5 6 7 8 VID2 VID1 VDA VDD VID0 GND VID4 VID3 DAC Voltage Identification Inputs. DAC Voltage Identification Inputs. Digital - to - Analog Voltage Output. Power Input Pin. DAC Voltage Identification Inputs. Ground. DAC Voltage Identification Inputs. DAC Voltage Identification Inputs.
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Absolute Maximum Ratings
(Note 1) Supply Input Voltage, VDD ------------------------------------------------------------------------------------------- 7V Power Dissipation, PD @ TA = 25C SOT-23-8 ---------------------------------------------------------------------------------------------------------------- 0.4W Package Thermal Resistance (Note 4) SOT-23-8, JA ----------------------------------------------------------------------------------------------------------- 250C/W Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------- 260C Storage Temperature Range ---------------------------------------------------------------------------------------- -65C to 150C ESD Susceptibility (Note 2) HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 3)
Supply Input Voltage, VDD ------------------------------------------------------------------------------------------- 5V 10% Junction Temperature Range ---------------------------------------------------------------------------------------- -40C to 125C Ambient Temperature Range --------------------------------------------------------------------------------------- -40C to 85C
Electrical Characteristics
(VDD = 5V, TA = 25C, unless otherwise specified)
Parameter VDD Supply Current Nominal Supply Current Reference & DAC Output Voltage Program DAC Output Voltage Accuracy VID(4:0) Input Low VID(4:0) Input High VID[4:0] Internal Pull-High Current Source Capability VID[4:0] Internal Pull-High Voltage Output Buffer DC Gain Bandwidth Slew Rate Impedance
Symbol
Test Conditions
Min
Typ
Max
Units
IDD
VDA open
--
2
5
mA
See Table 1 & Table 2 VDA 1V VDA < 1V -1 -10 -1.05 18 When select AMD CPU When select Intel CPU 2.2 1 -----2.4 1.1 +1 +10 0.4 --2.5 1.2 % mV V V A V V
Capacitor Load Only GBW SR ROUT CL=1nF CL=0.1uF
---60
70 1.64 9.5 --
---110
dB MHz mV/s
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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. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. JA is measured in the natural convection at T A = 25C on a low effective thermal conductivity test board of JEDEC 51-3 thermal measurement standard.
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Table 1. Output Voltage Program (VR 10)
Pin Name VID4 1 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 0 0 0 0 0 0 VID3 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 VID2 1 0 0 1 1 1 1 0 0 0 0 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 VID1 1 0 0 1 1 0 0 1 1 0 0 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 VID0 1 1 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 OFF 0.850V 0.875V 0.900V 0.925V 0.950V 0.975V 1.000V 1.025V 1.050V 1.075V 1.100V 1.125V 1.150V 1.175V 1.200V 1.225V 1.250V 1.275V 1.300V 1.325V 1.350V 1.375V 1.400V 1.425V 1.450V 1.475V 1.500V 1.525V 1.550V 1.575V 1.600V Nominal Output Voltage VDA
Note: (1) 0 : Connected to GND (2) 1 : Open
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Table 2. Output Voltage Program (K8)
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 VID3 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 1 VID2 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 VID1 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 VID0 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 VDA 1.550 1.525 1.500 1.475 1.450 1.425 1.400 1.375 1.350 1.325 1.200 1.275 1.250 1.225 1.200 1.175 1.150 1.125 1.100 1.075 1.050 1.025 1.000 0.975 0.950 0.925 0.900 0.875 0.850 0.825 0.800 Shutdown
Note: (1) 0 : Connected to GND (2) 1 : Open
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Typical Operating Characteristics
VVDA vs. Temperature
1.196 1.195 1.194 1.193 1.192 1.191 1.19 1.189 -40 -20 0 20 40 60 80 100 120 140
Error Between VVID & VVDA
0.7 0.6 0.5
V VID - V VDA (%)
VVDA (V)
0.4 0.3 0.2 0.1 0 0.85
0.975
1.1
1.225
1.35
1.475
1.6
Temperature (C)
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)
VID0 (1V/Div)
Time (25s/Div)
Time (25s/Div)
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Outline Dimension
H D L C B
b A e A1
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 1.000 0.000 1.500 0.220 2.600 2.800 0.585 0.100 0.300 Max 1.450 0.150 1.700 0.500 3.000 3.000 0.715 0.220 0.600
Dimensions In Inches Min 0.039 0.000 0.059 0.009 0.102 0.110 0.023 0.004 0.012 Max 0.057 0.006 0.067 0.020 0.118 0.118 0.028 0.009 0.024
SOT-23-8 Surface Mount Package
Richtek Technology Corporation
Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
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