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AHK432
Adjustable Low Voltage Shunt Regulator General Description
The AHK432 is a low voltage adjustable shunt reference with thermal stability guaranteed over the full industrial temperature range. This three-terminal regulator has an output voltage range that extends from VREF (1.24V) to 20V, giving designers outstanding flexibility in the development of power supplies and instrumentation. With a low operating current of 60A, the AHK432 is well suited for batterypowered portable electronic applications. It also has a sharp turn-on characteristic and a dynamic resistance of only 50m, making it an excellent replacement for zener diodes in low tempco designs. The AHK432 is available in the Pb-free, surfacemount 3- or 5-pin SOT23, as well as the through hole TO-92. Three voltage tolerance options are offered in each package: 0.5%, 1%, and 2%.
Features
* * * * * *
PowerManagerTM
Wide Output Voltage Range (1.24V to 20V) Operating Current From 60A to 100mA Low Dynamic Output Resistance of 50m 0.5% Trimmed Voltage Reference 10mV (Typical) VREF Deviation, From -40C to +105C Surface Mount 3- or 5-Pin SOT23 or ThroughHole 3-Pin TO-92 Package
Applications
* * * * * * * Adjustable and Programmable Supplies Global Voltage Reference for Multiple Power Supplies Instrumentation Isolated Feedback in Switching Power Supplies Linear Regulators (External Reference) Medical Electronics (see Endnote, page 10) Notebook Computers
Typical Application
IN
RL
OUT
R1 Adjustable regulator:
AHK432 R2 OUT = VREF
R1 + R2 R2
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AHK432
Adjustable Low Voltage Shunt Regulator Pin Descriptions
Pin
SOT23-3 SOT23-5 TO-92
Description
Reference. Cathode. Anode. Not internally connected.
1 2 3 N/A
4 3 5 1, 2
1 3 2 N/A
Pin Configuration
SOT23-3 (Top View) Reference Cathode 1 3 2 Anode
SOT23-5 (Top View) N/C N/C Cathode 15 2 34 Anode Reference
TO-92 (Top View) Reference 1 Anode 2 Cathode 3
2
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AHK432
Adjustable Low Voltage Shunt Regulator Absolute Maximum Ratings1
TA = 25C, unless otherwise noted. Symbol
VZ IZ IREF TJ TLEAD
Description
Cathode Voltage Continuous Cathode Current Reference Current Operating Junction Temperature Range Maximum Soldering Temperature (at Leads)
Value
20 100 3 -40 to 150 260
Units
V mA mA C C
Thermal Characteristics
Symbol
JA PD
Description
Maximum Thermal Resistance Maximum Power Dissipation
Package
TO-92 SOT23-3, SOT23-5 TO-92 SOT23-3, SOT23-5
Value
160 410 780 300
Units
C/W mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 432.2005.11.1.3
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AHK432
Adjustable Low Voltage Shunt Regulator Electrical Characteristics
TA = 25C, unless otherwise noted.
AHK432 0.5% AHK432 1.0% AHK432 2.0%
Symbol
VREF
Description Conditions
Reference Voltage
Min Typ Max Min Typ Max Min Typ Max Units
VDEV VREF/ VZ
IREF IREF(DEV)
IZ(OFF) RZ
IZ(MIN)
VZ = VREF TA = 25C 1.234 1.240 1.246 1.228 1.240 1.252 1.215 1.240 1.265 IZ = 10mA V 1.258 1.215 1.265 1.200 1.280 (test circuit 1) TA = -40 1.222 to +105C TA = -40C to +105C, 10 25 10 25 10 25 mV VREF Temp VZ = VREF, IZ = 10mA Deviation (test circuit 1) Ratio of Change IZ = 10mA, -1.0 -2.7 -1.0 -2.7 -1.0 -2.7 mV/V in VREF to VZ = 16V to VREF Change in (test circuit 2) Cathode Voltage Reference R1 = 10k, R2 = , 0.15 0.5 0.15 0.5 0.15 0.5 A Input Current IZ = 10mA (test circuit 2) IREF Temp TA = -40C to +105C 0.1 0.4 0.1 0.4 0.1 0.4 A Deviation R1 = 10k, R2 = , IZ = 10mA (test circuit 2) Off State VREF = 0V VZ = 6V 0.04 0.1 0.04 0.1 0.04 0.1 A Cathode Current (test circuit 3) VZ = 16V 0.04 0.5 0.04 0.5 0.04 0.5 Dynamic f <1kHz, VZ = VREF, 0.05 0.2 0.05 0.2 0.05 0.2 Output IZ = 100A to 100mA Impedance (test circuit 1) Minimum VZ = VREF (test circuit 1) 60 80 60 80 60 80 A Operating Current
4
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AHK432
Adjustable Low Voltage Shunt Regulator Typical Characteristics
Unless otherwise noted, TA = 25C, IZ = 10mA. Cathode Current vs. Cathode Voltage
15
Cathode Current vs. Cathode Voltage
200
Cathode Current (A)
-1 -0.5 0 0.5 1 1.5
Cathode Current (mA)
10 5 0 -5 -10 -15
150 100 50 0 -50 -100 -150 -200 -1 -0.5 0 0.5 1 1.5
Cathode Voltage ( V)
Cathode Voltage (V)
Reference Voltage vs. Temperature
1.252 180
Reference Current vs. Temperature
Reference Voltage (V )
1.248 1.244 1.24 1.236 1.232 -50 -25 0 25 50 75 100 125
Reference Curre nt (nA)
IZ = 10mA
160 140 120 100 80 60 40 20 0 -50 -25 0 25 50 75
IZ = 10mA R1 = 10k R2 = Open
100
125
Junction Temperature (C)
Junction Temperatur e (C)
Cathode Current vs. Temperature
80
Ratio of VREF / VZ vs. Temperature
0
Cathode Current (nA)
70 60 50 40 30 20 10 0 -50
Ratio (V/V)
VZ = 5V VREF = 0V (Off-state)
-100 -200 -300 -400 -500 -600
IZ = 10mA dVZ = VREF to 16V
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Junction Temperature (C)
Junction Temperature (C)
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AHK432
Adjustable Low Voltage Shunt Regulator Typical Characteristics
Unless otherwise noted, TA = 25C, IZ = 10mA. Cathode Impedance vs. Temperature
Normalized Impedance (%)
16 12 8 4 0 -4 -50 -25 0 25 50 75 100 125 0.01 1.E+01 10
Impedance vs. Frequency
Impedance ()
1
0.1
1.E+02
1.E+03
1.E+04
1.E+05
1.E+06
Junction Temperature (C)
Frequency ( Hz )
Gain and Phase vs. Frequency
120 100 180 150 120 90 60 30 0 -30 1.E+06
VOUT VIN
13.7k AHK432 8.25k 5V 169
Gain (dB)
80 60 40 20 0 -20 1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
Frequency (Hz)
Test Circuit for Voltage Gain and Phase
Stability Boundary
1k
100 80
IZ
Stable Stable
Current (mA)
R1=10k CL
60 40
Unstable
20
AHK432 R2
VREF=VZ
0 10.E+0
100.E+0
1.E+3
10.E+3
100.E+3
1.E+6
10.E+6
Load Capacitance (pF)
Test Circuit for Stability
6
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AHK432
Adjustable Low Voltage Shunt Regulator Functional Block Diagram
CATHODE
Symbol Diagram
CATHODE
REF
REF
VREF=1.24V
ANODE
ANODE
Test Circuits
Test Circuit 1 Test Circuit 2 Test Circuit 3
IN IZ IREF
OUT
IN IZ IREF
OUT
IN
OUT
IZ(off)
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AHK432
Adjustable Low Voltage Shunt Regulator Ordering Information1
Package
SOT23-3 SOT23-5 TO92 SOT23-3 SOT23-5 TO-92 Tape and Reel Ammo Bulk
Bulk or Tape and Reel
Tolerance
0.5% 1.0% 2.0%
N/A N/A AHK432ILY-.5-B1 AHK432IGY-.5-T1 AHK432IGV-.5-T1 AHK432ILY-.5-A1
N/A N/A AHK432ILY-1-B1 AHK432IGY-1-T1 AHK432IGV-1-T1 AHK432ILY-1-A1
N/A N/A AHK432ILY-2-B1 N/A N/A AHK432ILY-2-A1
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
TO-92 (Bulk packing option)
12.7 BSC 3.705 0.525
4.74 0.47
1.27
0.15
0.38 0.80 0.10
4.825 0.505
0.38
5
All dimensions in millimeters.
1. Sample stock is generally held on part numbers listed in BOLD.
8
5 x 2
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AHK432
Adjustable Low Voltage Shunt Regulator
TO-92 (Ammo packing option)
4.825 0.505 12.8 9.5 2.5 +0.4 -0.1 0.38 x 3
4.74 0.47
5 x 2 3.705 0.525
5 x 4
SOT23-3
2.92 0.12
1.30 0.10
0.95 BSC 1.90 BSC
2.37 0.27
0.86 0.16
0.075 0.075
0.96 0.21
0.38
0.40 0.10 x 3
0.50 0.10
0.54 REF
All dimensions in millimeters.
0.14 0.06
4 4
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AHK432
Adjustable Low Voltage Shunt Regulator
SOT23-5
2.85 0.15 1.90 BSC 0.95 BSC
1.575 0.125
1.10 0.20
0.60 REF
2.80 0.20
1.20 0.25
0.15 0.07 4 4
GAUGE PLANE
10 5
0.40 0.10
0.075 0.075
0.60 REF
0.45 0.15
0.10 BSC
All dimensions in millimeters.
Endnote: LIFE SUPPORT POLICY AnalogicTech's PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF Advanced Analogic Technologies Inc. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
(c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech's standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 10
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