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Boost converter combines output voltage programming with high output current drive in space-efficient packaging

30th August 2006

Advanced Analogic Technologies Inc., Europe

ES Admin

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Rated at 24V at 100mA, the AAT1232 is the latest addition to AnalogicTech’s rapidly growing family of boost converters targeted primarily at cost-sensitive OLED, LCD, and CCD applications. The device offers substantial output drive capability in an extremely compact footprint. Operating at a switching frequency up to 2MHz, the AAT1232 reduces PCB footprint by using small-value external inductors and capacitors. For example, the device operates with 2.2µH inductors that are approximately ten times smaller than many competitive boost conductors require. Small TSOP and TDFN packages and fewer external components also help reduce system cost.

Configuring the AAT1232’s operation is easy and dynamic. Depending on the application, the system designer can select one of two internal feedback reference voltages using its SEL input. In addition, the AAT1232 offers dynamic output voltage programming over a 16-step range using the company’s patented single-wire S2Cwire™ (Simple Serial Control) interface, a lower cost and simpler alternative to traditional I2C-based addressing/programming methods.

A True Load Disconnect feature on the AAT1232 completely isolates the load from the power sources when the EN/SET input is pulled low. This feature helps to minimise standby power dissipation and extends battery life by virtually eliminating leakage current. The AAT1232 maintains 80% efficiency across a wide range of load currents -- even down to 1mA.

The boost converter also features a number of protection circuits, including integrated soft start, cycle-by-cycle current limit, and short-circuit protection. The AAT1232 is available now in a Pb-free, 16-pin, 3x4mm TDFN package or a Pb-free, 12-pin TSOPJW package. The device is specified over the -40 to +85 degrees C operating temperature range.