RichTek RT9401A, RT9401B Technical data
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Preliminary
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.
Ordering Information
RT9401A/B
Package Type
V8 : SOT-23-8
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
K8
VR10.X
Note :
RichTek Pb-free 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.
RT9401A/B
5Bit VID Reference Generator
Features
zz
RT9401A Support 5bit DAC Voltage Conforming to
z
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Intel VRD10.x VID Table
zz
z RT9401B Support 5bit DAC Voltage Conforming to
zz
AMD K8 VID Table
zz
z 1% High Accuracy of V
zz
zz
z Small Footprint Package of SOT-23-8
zz
zz
z RoHS Compliant and 100% Lead (Pb)-Free
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Applications
z Desktop/Motherboard Microprocessor Core Power
Regulation
z High Accuracy and Programmable Voltage Power
Regulation
Pin Configurations
REF
(TOP VIEW)
VID3
1
VID2
SOT-23-8
VID4
7
2
VID1
GND
68
34
VDA
VID0
5
VDD
Marking Information
For marking information, contact our sales re presentative
directly or through a RichTek distributor located in your
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.
area, otherwise visit our website for detail.
Typical Application Circuit
RT9401A/B
1
VID2
2
VID1
3
VDA
CL
4
VDD
5V
DS9401A/B-04 June 2005 www.richtek.com
VID3
VID4
GND
VID0
8
7
6
5
1
RT9401A/B
Function Block Diagram
VID4
VID3
VID2
VID1
VID0
Functional Pin Description
Preliminary
VID
Input
V
REF
VDD
MUX
+
-
VDA
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
DS9401A/B-04 June 2005www.richtek.com
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Preliminary
Absolute Maximum Ratings (Note 1)
RT9401A/B
z Supply Input V oltage, V
z Power Dissipation, P
------------------------------------------------------------------------------------------- 7V
DD
@ TA = 25°C
D
SOT-23-8 ---------------------------------------------------------------------------------------------------------------- 0.4W
z Package Thermal Resistance (Note 4)
SOT-23-8, θJA----------------------------------------------------------------------------------------------------------- 250°C/W
z Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------- 260°C
z Storage T emperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Ma chine Mode)-------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
z Supply Input V oltage, V
z Junction T emperature Range---------------------------------------------------------------------------------------- −40°C to 125°C
------------------------------------------------------------------------------------------- 5V ±10%
DD
Electrical Characteristics
(V
= 5V, T
DD
VDD Supply Current
= 25° C, unless otherwise specified)
A
Parameter Symbol Test Conditions Min Typ Max Units
Nominal Supply Current IDD VDA open -- 2 5 mA
Reference & DAC
Output Voltage Program See Table 1 & Table 2
VDA ≥ 1V -1 -- +1 %
DAC Output Voltage Accuracy
VDA < 1V -10 -- +10 mV
VID(4:0) Input Low -- 0.65 -- V
VID(4:0) Input High 1.05 -- -- V
VID[4:0] Internal Pull-High Current
Source Capability
When select AMD CPU 2.2 2.4 2.5 V
18 -- -- μA
VID[4:0] Internal Pull-H igh Vol tag e
When select Intel CPU 1 1.1 1.2 V
Output Buffer
DC Gain Capacitor Load Only -- 70 -- dB
Bandwidth GBW CL=1nF -- 1.64 -- MHz
Slew Rate SR CL=0.1uF -- 9.5 -- mV/μs
Impedance R
60 -- 110 Ω
OUT
DS9401A/B-04 June 2005 www.richtek.com
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