SmartSwitch
™
General Description
The AHK432 is a low voltage adjustable shunt refer-
ence with thermal stability guaranteed over the full
industrial temperature range. This 3-terminal regula-
tor has an output voltage range that extends from
V
REF
(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 battery-powered
portable electronic applications. It also has a sharp
turn-on characteristic and a dynamic resistance of
only 50mW 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%.
Features
• Wide output voltage range (1.24 to 20V)
• Operating current from 60µA to 100mA
• Low dynamic output resistance of 50mΩ
• ±0.5% trimmed voltage reference
• 10mV typ. V
REF
deviation, from -40 to +105°C
• Surface mount 3 or 5 pin SOT-23 or through-
hole 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
AHK432
Adjustable Low Voltage Shunt Regulator
Preliminary
Information
432.2001.11.0.96 1
Typical Application
R
L
IN OUT
R2
R1
AHK432
Adjustable regulator:
OUT = V
REF

R1 + R2
R2
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