AQ533 Datasheet | Acutechnology Semiconductor

Description The AQ533 is an ultra-low dropout voltage regulator capable of delivering 500 m A to the load. It is adjustable and can set a precise voltage from 1.22V to 12V with two external resistors. The AQ533 meets all specifications down to 1.22V output, unlike CMOS LDO’s which loose performance with outputs below 2.25V. The enable pin provides a remote turn-off for low power consumption. It draws virtually zero current in shutdown mode and implements Sequential, Ratiometric, or Simultaneous sequencing schemes. This also allows for a separate bias connection from the pass transistor in order to achieve ultra low dropout from VIN to VOUT. Reverse current protection blocks current flowing from VOUT to VIN when the AQ533 is disabled. No current flows. To assure accuracy within 1.5% over temperature, the heart of the AQ533 is a selfcorrecting Acu Ref™ bandgap reference. On-chip current limit and thermal shutdown with hysteresis protects against any bination of overload and ambient temperature that might cause the junction temperature to exceed safe limits. Applications - Graphic cards - PC motherboards - Cell Phones - DVD video player Features - Low dropout voltage (350m V at 500 m A) - Enable pin implements sequencing - Reverse current protection - Vout tolerance less than 1.5% over - - - - - - temperature Featured in the very small SOT-23 package Stable with low cost 1µF capacitor Low ground current <100 µA Thermal protection with hysteresis Short circuit protection Ro HS pliant available Typical Application .acutechnology. .Data Sheet.in Acutechnology Semiconductor Inc. Pin Configuration Pin Descriptions Pin Name VIN Ground ENABLE Adjust VOUT Function + Unregulated Input Voltage, Collector of Pass Transistor - Ground Active high, ENABLE > (0.95V + VOUT), Chip bias circuit supply OFF low, ENABLE < 0.25V Adjust input. Connect to resistive feed back divider. Regulated Output Functional Block Diagram .acutechnology. Rev. 1.7 September 13,...