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 60µA, the AHK432 is well suited for batterypowered portable electronic applications. It also has a sharp turn-on characteristic and a dynamic resistance of only 50mΩ, 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
• • • • • •
PowerManager™
Wide Output Voltage Range (1.24V to 20V) Operating Current From 60µA to 100mA Low Dynamic Output Resistance of 50mΩ ±0.5% Trimmed Voltage Reference 10mV (Typical) VREF Deviation, From -40°C to +105°C 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
432.2005.11.1.3
1
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
432.2005.11.1.3
AHK432
Adjustable Low Voltage Shunt Regulator Absolute Maximum Ratings1
TA = 25°C, 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
ΘJA 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
3
AHK432
Adjustable Low Voltage Shunt Regulator Electrical Characteristics
TA = 25°C, 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 = 25°C 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 +105°C TA = -40°C to +105°C, 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 = 10kΩ, R2 = ∞, 0.15 0.5 0.15 0.5 0.15 0.5 µA Input Current IZ = 10mA (test circuit 2) IREF Temp TA = -40°C to +105°C 0.1 0.4 0.1 0.4 0.1 0.4 µA Deviation R1 = 10kΩ, R2 = ∞, IZ = 10mA (test circuit 2) Off State VREF = 0V VZ = 6V 0.04 0.1 0.04 0.1 0.04 0.1 µA Cathode Current (test circuit 3) VZ = 16V 0.04 0.5 0.04 0.5 0.04 0.5 Dynamic f
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