AQ8211 Datasheet, PDF (1/10 Pages) Acutechnology Semiconductor – Ultra-Low Dropout 500mA Voltage Regulator with Enable

Product Specification
Revision 2.1
AQ8211
Ultra-Low Dropout
500mA Voltage Regulator
with Enable
January 22, 2007
General Description
The AQ8211 is an ultra-low dropout voltage
regulator capable of delivering 500 mA to the
load. It is adjustable and can set a precise
voltage from 1.22V to 12V with two external
resistors. The AQ8211 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 AQ8211 is
disabled. No current flows.
To assure accuracy over temperature, the heart
of the AQ8211 is a self-correcting AcuRef™
bandgap reference.
On-chip current limit and thermal shutdown with
hysteresis protects against any combination of
overload and ambient temperature that might
cause the junction temperature to exceed safe
limits.
Applications
• Graphic cards and PC motherboards
• Cell Phones
• DVD video player
Replacement for:
• LX8211
Features
• Extended Temp Range -40C˚ ≤ 125C˚
• Low dropout voltage (350mV at 500 mA)
• Enable pin implements sequencing
• Reverse current protection
• 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
• RoHS compliant
Typical Application
www.acutechnology.com
AQ8211