Linear Voltage Regulators

AQ104: Quik LDO™

Preliminary Information

The Quik LDO™ AQ104 is a low dropout regulator that requires no external output capacitor for stability and it is stable with any capacitive load. It offers 0.5 Ohms pass device with 500mA load current. Its output voltage is preset to values between 2V and 3.3V with 1% accuracy and presents very good line and load regulation. It also includes output current limit with foldback characteristic and thermal shutdown. The removal of the output capacitor allows cost and board space reduction along with energy saving at power on and off. It is best suited for battery-powered equipment and in particular for cellular phones.
Download AQ104 Proposed datasheet

AQ111: 1A Voltage Regulator in Power SOT23-6

1A regulator in thermally enhanced SOT23-6 packages for significantly reduced footprint.
Download AQ111 datasheet

AQ112: 1A Voltage Regulator

Similar to the AQ1541, the AQ112 implements a 1A regulator in TetraPack™, Acutechnology's proprietary four terminal SOT223. Separate access is given to the collector of the NPN pass device, allowing true LDO dropout with typical NPN regulator stability and performance.

Download AQ112 datasheet

AQ1117: 1A Voltage Regulator

Industry standard 1A regulator in thermally enhanced SOT223. Also availbale in SOT-89 packages for significantly reduced footprint.
Download AQ1117 datasheet

AQ1541: 1A Voltage Regulator with Enable

The AQ1541 series of voltage regulators feature a four pin power package (TetraPack™) allowing for an enable pin. The enable pin implements both digital (on/off) and analog functionality allowing outputs to be sequenced or for ratiometric, coincident, or staggered tracking schemes.

Download AQ1541 datasheet

AQ8211: 500mA LDO with Enable

Samples Available

The AQ8211 is a SOT-23 LDO with very low dropout and reverse current blocking. Separate connections to the input supply and to a higher bias supply allow for very low drop in a bipolar NPN follower pass device for optimal performance. The enable threshold for AQ8211 is with respect to output voltage; use BQ8211 for an enable threshold is with respect to ground.
Download AQ8211 datasheet or

BQ8211: 300mA LDO with Enable

Samples Available

The BQ8211 is a SOT-23 LDO with very low dropout. Separate connections to the input supply and to a higher bias supply allow for very low drop in a bipolar NPN follower pass device for optimal performance. The enable threshold for BQ8211 is with respect to ground.
BQ8211 datasheet

AQ120: Linear Battery Charger Controller

AQ120: LDO Controller

The AQ120 is a low cost linear battery charger controller with similar features to the industry standard "1734" style controller, but with the extra ability to charge multiple cell Lithium Ion batteries as well as NiCad types up to 18 volts. Both output voltage and charge current are programmable with a minimum of external components.

The AQ120 can also be used as a low dropout regulator controller. Using an external PNP, a very inexpensive LDO can be configured; using a discrete PMOS, the AQ120 can be used as a very high current LDO controller, with applications up to tens of Amperes. A separate datasheet is available for use in LDO applications. (The parts and electrical specifications are identical, only terminology differs in the description of the part and its applications.),

Download the AQ120 datasheet for Chargers,
the AQ120 battery charger application note
or the AQ120 datasheet for LDO controller