AME431B Datasheet | Analog Microelectronics

.. AME, Inc. Adjustable Precision Shunt Regulator n General Description The AME431B series ICs are 3-terminal adjustable shunt regulator with guaranteed temperature stability over a full operation range. These ICs feature sharp turn-on characteristics, low temperature coefficient and low output impendance, which make them ideal substitutes for Zener diodes in applications such as switching power supply, charger and other adjustable regulators. The reference is set to 1.24V for AME431Bxxxxx12 and 2.5V for AME431Bxxxxx25. The output voltage can be set to 1.24V to 16V for VREF=1.24V part type and 2.5 to 36V for VREF=2.5V part type with two external resistors. The AME431B precision reference is offered in two reference tolerance: 0.5% and 1.0% The 5 main packages have low thermal impendance which allows operation over a wide range of -40o C t o +125o C. n Functional Block Diagram V+ (Cathode) VREF GND (Anode) n Features l Very accurate reference voltage : 0.15% typical l High stability under capacitive load l Low temperature deviation: 4.5m V typical l Low equivalent full-range temperature coefficient with 20PPM/o C typical l Low dynamic output resistance: 0.2Ω typical l Sink current capacity from 1m A to 100m A l Low output noise l Available in 5 packages: TO-92, SOT-23-3, SOT-89, SO-8 and SOT-25 n Applications l Adjustable power supplies l Linear regulators l Battery operated puter l Portable electronics l l l l l Instrumentation Switching power supply Mother board LCD monitor Note book puter .. AME, Inc. Adjustable Precision Shunt Regulator n Typical Applications Shunt Regulator R3 VIN VOUT R1 VREF VO=(1+R1/R2) VREF AME431B R2 High Current Shunt Regulator R1 VOUT R4 R2 VO =(1+R2/R3) VREF VREF AME431B R3 Current Source or Current Limit VIN R2 IOUT R1 IOUT =VREF/R2+IKA .. AME, Inc. Adjustable Precision Shunt Regulator n Typical Applications...