Power Electronics / Power Management


Boost converter with dynamic output voltage programming has small footprint

20 September 2006 Power Electronics / Power Management

Whilst operating, lighting and display functions in portable products can consume a significant portion of a lithium-ion battery's available power, finding ways to optimise power dissipation and maintain display quality is necessary. Advanced Analogic Technologies' AAT1232 boost converter is tailor-made for these cost-sensitive applications by combining output voltage programming with high output current drive in space-efficient packaging.

Rated at 24 V at 100 mA, the AAT1232 boost converter is said to offer substantial output drive capability in an extremely compact footprint. Operating at a switching frequency up to 2 MHz, it reduces PCB footprint by using small-value external inductors and capacitors. For example, the device operates with 2,2 μH inductors that the company claims are approximately 10 times smaller than many industry standard 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 single-wire S²Cwire (simple serial control) interface - a lower cost and simpler alternative to traditional I²C-based addressing/programming methods, according to AATI.

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 1 mA.

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 comes in a Pb-free, 16-pin, 3 x 4 mm TDFN package or a Pb-free, 12-pin TSOPJW package. It is specified over -40 to +85°C.

For more information contact Stephen Delport, Hi-Q Electronics, +27 (0)21 595 1307.



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