General Description
The APL1431L is a 3-terminal low voltage adjustable precision reference with specified thermal stability over applicable commercial temperature ranges . Output voltage may be set to any value between VREF (1.24 V) and 20 V with two external resistors (see Figure 2) . When used with an photocoupler , the APL1431L is an ideal voltage reference in isolated feedback circuits for 1.24V to 12V switching mode power supplies . This device has a typical output impedance of 0.1Ω . Active output circuitry provides a very sharp turn-on characteristic , making the APL1431L excellent replacements for zener diodes in many applications , including on-board regulation and adjustable power supplies.

Features
• Precise Reference Voltage to 1.24V
• Guaranteed 0.5% or 1% Reference Voltage Tolerance
• Sink Current Capability , 60mA to 100mA
• Quick Turn-on
• Adjustable Output Voltage , VO = VREF to 20V
• Low Operational Cathode Current , 60mA Typical
• 0.1Ω Typical Output Impedance
• SOT-23-5 Packages

Applications
• Linear Regulators
• Adjustable Power Supply
• Switching Power Supply