APL431L Datasheet, PDF (1/15 Pages) Anpec Electronics Coropration – Low Voltage Adjustable Precision Shunt Regulator

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)
Applications
• Linear Regulators
• Adjustable Power Supply
• Switching Power Supply
Symbol
Anode
REF
Cathode
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
3
1
2
REF CATHODE
SOT-23-3 (Top View)
3 CATHODE
2 ANODE
1 REF
TO-92 (Top View)
NC
NC
5
4
1
2
3
REF ANODE CATHODE
SOT-23-5 (Top View)
1
2
3
REF ANODE CATHODE
SOT-89 (Top View)
Functional Diagram
Cathode
REF
+
_
Vref
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.
1
Rev. B.8 - Mar., 2005
www.anpec.com.tw