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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 3-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 battery-powered 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 surface-mount 3 or 5 pin SOT-23, as well as the through hole TO-92. Three voltage tolerance options are offered in each package: 0.5%, 1%, and 2%.
AHK432
Features
* * * * * *
PowerManagerTM SmartSwitch TM
Wide output voltage range (1.24 to 20V) Operating current from 60A to 100mA Low dynamic output resistance of 50m 0.5% trimmed voltage reference 10mV typ. VREF deviation, from -40 to +105C Surface mount 3 or 5 pin SOT-23 or throughhole 3 pin TO-92 packages
Applications
* * * * * * * Notebook computers Isolated feedback in switching power supplies Adjustable and programmable supplies Linear regulators (External Reference) Instrumentation Medical Electronics* Global voltage reference for multiple power supplies
Typical Application
IN
RL
OUT
R1
Adjustable regulator: OUT = VREF R1 + R2 R2
AHK432 R2
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Adjustable Low Voltage Shunt Regulator Absolute Maximum Ratings
Symbol
VZ IZ IREF TJ JA PD TLEAD
AHK432
(TA=25C unless otherwise noted) Value
20 100 3 -40 to 150 160 410 780 300 260
Description
Cathode Voltage Continuous Cathode Current Reference Current Operating Junction Temperature Range Maximum Thermal Resistance Maximum Power Dissipation Maximum Soldering Temperature (at Leads) TO-92 SOT-23-3, SOT-23-5 TO-92 SOT-23-3, SOT-23-5
Units
V mA mA C C/W mW C
Note: 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.
Electrical Characteristics
Symbol Description
Reference Voltage VREF Temp Deviation Ratio of Change in VREF to Change in Cathode Voltage Reference Input Current IREF Temp Deviation
(TJ=25C unless otherwise noted)
AHK432 0.5% AHK432 1.0% typ AHK432 2.0% max Units
Conditions
VZ=VREF IZ=10mA (test circuit 1) TA=-40 to +105C, VZ=VREF, IZ=10mA (test circuit 1) IZ=10mA, VZ=16V to VREF (test circuit 2) R1=10k, R2=, IZ=10mA (test circuit 2) TA=-40 to +105C R1=10k, R2=, IZ=10mA (test circuit 2) VREF=0V (test circuit 3) f<1kHz, VZ=VREF, IZ=100A to 100mA (test circuit 1) VZ=VREF (test circuit 1) VZ=6V VZ=16V
min
typ
max min
Max min typ
TA=25C 1.234 1.240 1.246 1.228 1.240 1.252 1.215 1.240 1.265 TA=-40 1.222 to +105C 10 V 1.258 1.215 25 10 1.265 1.200 25 10 1.280 25 mV
VREF
VDEV
VREF/VZ
-1.0
-2.7
-1.0
-2.7
-1.0
-2.7
mV/V
IREF
0.15
0.5
0.15
0.5
0.15
0.5
A
IREF(DEV)
0.1
0.4
0.1
0.4
0.1
0.4
A
IZ(OFF) RZ
Off State Cathode Current Dynamic Output Impedance Minimum Operating Current
0.04 0.04 0.05
0.1 0.5 0.2
0.04 0.04 0.05
0.1 0.5 0.2
0.04 0.04 0.05
0.1 0.5 0.2
A
IZ(MIN)
60
80
60
80
60
80
A
2
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Adjustable Low Voltage Shunt Regulator Test Circuits
Test Circuit 1 Test Circuit 2 Test Circuit 3
AHK432
IN IZ IREF
OUT
IN IZ IREF
OUT
IN
OUT
IZ(off)
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Adjustable Low Voltage Shunt Regulator Typical Characteristics
(Unless otherwise noted, TA = 25C, IZ = 10mA) Cathode Current vs. Cathode Voltage
15
AHK432
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 -100
Cathode Current (nA)
70 60 50 40 30 20 10 0 -50
Ratio (V/V)
VZ=5V VREF=0V (Off-state)
IZ=10mA dVZ=VREF to 16V
-200 -300 -400 -500 -600
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Junction Temperature (C)
Junction Temperature (C)
4
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Adjustable Low Voltage Shunt Regulator
AHK432
(Unless otherwise noted, TA = 25C, IZ = 10mA) Cathode Impedance vs. Temperature
16% 10
Impedance vs. Frequency
Normalized Impedance
12% 8% 4% 0% -4 % -50
Impedance ()
1
0.1
-25
0
25
50
75
100
125
0.01 1.E+01
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
Current (mA)
Stable
IZ
Stable
R1=10k CL
60 40 20
Unstable
VREF=VZ
AHK432
R2
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
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Adjustable Low Voltage Shunt Regulator Functional Block Diagram
CATHODE
AHK432
Symbol Diagram
CATHODE
REF
REF
VREF=1.24V
ANODE
ANODE
Ordering Information
Package SOT-23-3 SOT-23-5 TO-92 SOT-23-3 SOT-23-5 TO-92 Ammo Tape and Reel Bulk Bulk or Tape and Reel Tolerance 0.5% N/A N/A AHK432ILY-.5-B1 AHK432IGY-.5-T1 AHK432IGV-.5-T1 AHK432ILY-.5-A1 1.0% N/A N/A AHK432ILY-1-B1 AHK432IGY-1-T1 AHK432IGV-1-T1 AHK432ILY-1-A1 2.0% N/A N/A AHK432ILY-2-B1 N/A N/A AHK432ILY-2-A1
* 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.
6
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Adjustable Low Voltage Shunt Regulator Pin Configuration
3-lead SOT-23 (Top View) Reference Cathode 1 3 2 Anode
5-lead SOT-23 (Top View) N/C N/C Cathode 15 2 34 Anode Reference
TO-92 (Top View) Reference 1 Anode 2 Cathode 3
AHK432
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.
5 x 2
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Adjustable Low Voltage Shunt Regulator
TO-92 (Ammo packing option)
4.825 0.505 12.8 9.5 2.5 +0.4 -0.1
AHK432
4.74 0.47
0.38 x 3
5 x 2 3.705 0.525
5 x 4
SOT-23-3
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.
8
0.14 0.06
4 4
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Adjustable Low Voltage Shunt Regulator
SOT-23-5
2.85 0.15 1.90 BSC 0.95 BSC
AHK432
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.
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Adjustable Low Voltage Shunt Regulator
AHK432
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, and advise customers 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
432.2004.04.1.0

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