APL431L
Low Voltage Adjustable Precision Shunt Regulator
Features
•
•
•
•
•
•
•
•
•
Precise Reference Voltage to 1.24V
Guaranteed 0.5% or 1% Reference Voltage
Tolerance
Sink Current Capability, 80uA to 100mA
Quick Turn-on
Adjustable Output Voltage, V
O
= V
REF
to 20V
Low Operational Cathode Current, 80µA
Typical
0.1Ω Typical Output Impedance
SOT-23-3, SOT-23-5, TO-92 and SOT-89
Packages
Lead Free Available (RoHS Compliant)
General Description
The APL431L is a 3-terminal low voltage adjustable
precision reference with specified thermal stability
over applicable commercial temperature ranges. Out-
put voltage may be set to any value between V
ref
(1.
24 V) and 20 V with two external resistors (see Fig-
ure 2). When used with an photocoupler, the
APL431L is an ideal voltage reference in isolated feed-
back circuits for 3V to 12V switching-mode power
supplies. This device has a typical output imped-
ance of 0.1Ω. Active output circuitry provides a very
sharp turn-on characteristic, making the APL431L ex-
cellent replacements for zener diodes in many
applications, including on-board regulation and ad-
justable power supplies.
ANODE
NC
NC
3
1
2
5
1
2
4
3
Applications
•
•
•
Linear Regulators
REF CATHODE
REF ANO DE CATHO DE
SOT-23-3 (Top View)
3
C ATHO D E
SOT-23-5 (Top View)
Adjustable Power Supply
2
AN OD E
Switching Power Supply
1
R EF
1
2
3
REF
ANODE CATHODE
Symbol
REF
Anode
Cathode
TO-92 (Top View)
SOT-89 (Top View)
Functional Diagram
C athode
REF
+
_
V
ref
Anode
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright
ANPEC Electronics Corp.
Rev. B.8 - Mar., 2005
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
