RT9401D

®
RT9401D
5-Bit VID Reference Generator
General Description
Features
The RT9401D is a digital to analog converter which
generate a reference voltage for AMD Mars 5-bit VID code.
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Support 5-Bit DAC Voltage Conforming to AMD Mars
VID Table
The IC is 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. The RT9401D
is available in SOT-23-8 package.
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1% High Accuracy of VREF
Small Footprint Package of SOT-23-8
RoHS Compliant and Halogen Free
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z
Applications
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Ordering Information
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Pin Configurations
ments of IPC/JEDEC J-STD-020.
8
7
6
5
2
3
4
Suitable for use in SnPb or Pb-free soldering processes.
VID2
`
VID0
RoHS compliant and compatible with the current require-
VDD
`
GND
Richtek products are :
VDA
(TOP VIEW)
Note :
VID4
Lead Plating System
G : Green (Halogen Free and Pb Free)
VID1
Package Type
V8 : SOT-23-8
VID3
RT9401D
Desktop/Motherboard Microprocessor Core Power
Regulation
High Accuracy and Programmable Voltage Power
Regulation
Marking Information
00= : Product Code
00=DNN
SOT-23-8
DNN : Date Code
Simplified Application Circuit
5-bit VID Code
RT9401D
VID0
VDA
VID1
VID2
VID3
VID4
GND
CL
VDD
Copyright © 2012 Richtek Technology Corporation. All rights reserved.
DS9401D-00
December 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
RT9401D
Functional Pin Description
Pin No.
Pin Name
Pin Function
1
VID2
DAC Voltage Identification Input.
2
VID1
DAC Voltage Identification Input.
3
VDA
Digital - to - Analog Voltage Output.
4
VDD
Power Input Pin.
5
VID0
DAC Voltage Identification Input.
6
GND
Ground.
7
VID4
DAC Voltage Identification Input.
8
VID3
DAC Voltage Identification Input.
Function Block Diagram
VDD
VID4
VID3
VID2
VID
Input
VID1
MUX
VID0
+
-
VDA
GND
VREF
Operation
The VID input receives the signals from the VID0, VID2,
VID3, VID4 pins, and sends them to the MUX. According
to VID signals, the MUX generates a corresponding output
voltage shown as Table 1 for AMD Mars 5-bit VID code.
Copyright © 2012 Richtek Technology Corporation. All rights reserved.
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2
is a registered trademark of Richtek Technology Corporation.
DS9401D-00
December 2012
RT9401D
Absolute Maximum Ratings
z
z
z
z
z
z
(Note 1)
Supply Input Voltage, VDD ---------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C
SOT-23-8 -------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2)
SOT-23-8, θJA --------------------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------Storage Temperature Range -------------------------------------------------------------------------------------------ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------
Recommended Operating Conditions
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7V
0.54W
186.2°C/W
260°C
−65°C to 150°C
2kV
(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
VDA Open
--
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
VID [4:0] Internal Pull-High
Current Source Capability
18
--
--
μA
VID [4:0] Internal Pull-High
Voltage
2.2
2.4
2.5
V
Capacitor Load Only
--
70
--
dB
VDD Supply Current
Nominal Supply Current
IDD
Reference & DAC
Output Voltage Program
See Table 1
DAC Output Voltage Accuracy
Output Buffer
DC Gain
Bandwidth
GBW
CL = 1nF
--
1.64
--
MHz
Slew Rate
SR
CL = 0.1μF
--
9.5
--
mV/μs
Impedance
ROUT
60
--
110
Ω
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and 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 may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright © 2012 Richtek Technology Corporation. All rights reserved.
DS9401D-00
December 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3
RT9401D
Typical Application Circuit
5-bit VID Code
5V
Copyright © 2012 Richtek Technology Corporation. All rights reserved.
www.richtek.com
4
5
2
1
8
7
RT9401D
VID0
3
VDA
VID1
VID2
VID3
6
VID4
GND
CL
4 VDD
is a registered trademark of Richtek Technology Corporation.
DS9401D-00
December 2012
RT9401D
Table 1. Output Voltage Program
VID4
VID3
VID2
VID1
VID0
Nominal Output Voltage VDA
0
0
0
0
0
1.500
0
0
0
0
1
1.475
0
0
0
1
0
1.450
0
0
0
1
1
1.425
0
0
1
0
0
1.400
0
0
1
0
1
1.375
0
0
1
1
0
1.350
0
0
1
1
1
1.325
0
1
0
0
0
1.300
0
1
0
0
1
1.275
0
1
0
1
0
1.250
0
1
0
1
1
1.225
0
1
1
0
0
1.200
0
1
1
0
1
1.175
0
1
1
1
0
1.150
0
1
1
1
1
1.125
1
0
0
0
0
1.100
1
0
0
0
1
1.075
1
0
0
1
0
1.050
1
0
0
1
1
1.025
1
0
1
0
0
1.000
1
0
1
0
1
0.975
1
0
1
1
0
0.950
1
0
1
1
1
0.925
1
1
0
0
0
0.900
1
1
0
0
1
0.875
1
1
0
1
0
0.850
1
1
0
1
1
0.825
1
1
1
0
0
0.800
1
1
1
0
1
0.775
1
1
1
1
0
0.750
1
1
1
1
1
Shutdown
Note: (1) 0 : Connected to GND
(2) 1 : Open
Copyright © 2012 Richtek Technology Corporation. All rights reserved.
DS9401D-00
December 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
RT9401D
Typical Operating Characteristics
Error Between VVID & VVDA
0.7
1.195
0.6
1.194
0.5
VVID - VVDA (%)
VVDA (V)
VVDA vs. Temperature
1.196
1.193
1.192
1.191
1.190
0.4
0.3
0.2
0.1
1.189
-40
-20
0
20
40
60
80
100
120
140
0
0.85
0.975
1.1
1.225
1.35
1.475
Temperature (°C)
VVID (V)
VID on the Fly Falling
VID on the Fly Rising
VVDA = 1.3V to 1.0625V
No Load
1.6
VVDA = 1.3V to 1.0625V
No Load
VDA (100mV/Div)
VDA (100mV/Div)
VID0 (1V/Div)
Time (25μs/Div)
Copyright © 2012 Richtek Technology Corporation. All rights reserved.
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VID0 (1V/Div)
Time (25μs/Div)
is a registered trademark of Richtek Technology Corporation.
DS9401D-00
December 2012
RT9401D
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
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
DS9401D-00
December 2012
www.richtek.com
7