APL431

APL431 Adjustable Precision Shunt Regulator Features General Description Precise Reference Voltage to 2.500V Guaranteed 0.5%, 1% or 2% Reference Voltage Tolerance Sink Current Capability, 1mA to 100mA Quick Turn-On Adjustable Output Voltage, V = V to 20V O REF Low Operational Cathode Current, 250µA Typical 0.1Ω Typical Output Impedance SOT-23-3, SOT-23-5, SOT-89, SOP-8, and TO-92 Packages Lead Free and Green Devices Available (RoHS Compliant) Applications Linear Regulators Adjustable Power Supply Switching Power Supply The APL431 is a 3-terminal adjustable voltage reference with specified thermal stability over applicable commercial temperature ranges. Output voltage may be set to any value between VREF (2.5 V) and 20 V with two external resistors (See Figure 2). When used with an photocoupler, the APL431 is an ideal voltage reference in isolated feedback circuits for 2.5V 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 APL431 excellent replacements for zener diodes in many applications, including on-board regulation and adjustable power supplies. Pin Configuration ANODE 3 12 REF CATHODE NC NC 54 123 REF ANODE CATHODE Symbol SOT-23-3 (Top View) SOT-23-5 (Top View) REF Anode Cathode Functional Diagram Cathode 123 REF ANODE CATHODE SOT-89 (Top View) CATHODE ANODE ANODE NC 1 2 3 4 8 REF 7 ANODE 6 ANODE 5 NC...