Step-up DC/DC converter combines high efficiency, true load disconnect and small footprint for ultraportable systems.
Ultraportable systems running from single or dual alkaline, NiMH, or NiCd cells need to boost voltage while conforming to strict requirements for battery life and system size. A low-voltage step-up converter from AnalogicTech maintains high efficiency over the entire output current range, requires no external compensation, and provides true load disconnect (TLD) – all in a tiny 2.0x2.1mm SC70JW package. The device delivers an ideal balance of high efficiency, essential features, and small total solution size.
Extending AnalogicTech’s rapidly growing boost converter line, the AAT1265 synchronous fixed frequency step-up converter supplies 100mA to a 3.3V load from a single AA cell and 250mA from dual AA cells. The AAT1265 delivers efficiency up to 93 percent and maintains high efficiency over the entire load range. A 2MHz switching frequency helps minimise solution footprint by enabling the use of extremely small inductors and capacitors.
Leakage current is a common concern with boost converters. Typically these devices present a conduction path from the input to the output via the body diode of the P-channel MOSFET when the system is not active. To eliminate such power loss, designers often use a load switch and control circuitry to disconnect the load from the converter. AnalogicTech’s AAT1265 solves this problem with the TLD feature which disconnects the body diode from the output. This feature extends battery life and simplifies the system design by eliminating an external load switch and control circuitry.
The AAT1265 also adds a variety of safety features to preserve the integrity of the device including short-circuit and over-current protection, inrush current limit, and soft start. Specified over the -40 to +85 degrees C temperature range, the AAT1265 is available in a Pb-free, compact 2.0x2.1mm SC70JW-8 package.
Further information: Phil Dewsbury, Advanced Analogic Technologies, Inc. Tel: +44 (0) 1189 657763 Fax: +44 (0) 1189 657764 Steve Rowley, Publitek Limited Tel: +44 (0) 1889 579493 E-mail: firstname.lastname@example.org Web: http://www.publitek.com