Regulator Delivers Display Voltages Efficiently From a Single AA Cell

The AS1343 high-voltage boost regulator provides a voltage up to 42V, delivering the output required for applications such as LCD or OLED displays from a battery source.

The AS1343 offers automatic power-save operation, which improves efficiency at light loads, whilst the micro-power design reduces operating supply current to 22µA. The AS1343 also offers a shutdown mode, requiring less than 1µA current, combined with an output disconnect feature. Altogether, these features reduce the power consumption of the AS1343, resulting in increased battery life.

austriamicrosystems’ AS1343 delivers 40mA with an output voltage of 24V and an input voltage of 3.3V; or 30mA from a single AA cell with an output voltage adjustable in the range of 5.5V to 42V. The AS1343 can operate from a single supply voltage between 0.9V and 3.6V.

The 1MHz fixed switching frequency minimises the PCB footprint by allowing the use of smaller inductors and capacitors. This constant frequency switching also results in low, predictable output noise that can be easily filtered.

The AS1343 offers 2% output voltage accuracy, with a power-ok signal that indicates if the voltage is within 10% of regulation. This regulator is available in a compact 3mmx 3mmx 0.8mm TDFN 10-pin package for industrial temperature ranges from -40°C to 85°C.

 

FEATURES 5.5V to 42V adjustable output voltage 0.9V to 3.6V supply voltage range 30mA, 12V output from 1.5V input 40mA, 24V output from 3.3V input 85% efficiency 1MHz switching frequency Output disconnect Power-OK output 22µA operating supply current 0.1µA shutdown current

APPLICATIONS OLED-display power supply LCD bias generators Portable and battery-powered devices PDAs and organisers

 

 

austriamicrosystems / AS1343