AAT1217

PRODUCT DATASHEET AAT1217 SwitchRegTM General Description The AAT1217 is a high efficiency, synchronous, fixed frequency, step-up converter designed for single-cell or dual-cell alkaline, NiMH, or NiCd battery-powered applications. The high 1.2MHz switching frequency and completely integrated control circuitry minimize the total solution footprint area while maintaining excellent regulation, ripple, and transient response throughout the full load range. Light load mode operation and low quiescent current allow the AAT1217 to maintain high efficiency performance for light load conditions. With a 1.2A peak inductor current limit, the AAT1217 is capable of delivering 100mA to the load from a single AA cell, 400mA from dual AA cells, or up to 500mA from a single-cell lithiumion battery. The AAT1217 has a 0.85V start-up voltage with operation down to 0.5V. The AAT1217 is available in a Pb-free, space-saving low profile (1mm) 6-pin TSOT23 or 6-pin SOT23 package and is rated over the -40°C to +85°C ambient temperature range. 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter Features • • • • • • • • • • • • • • • • • VIN Operation Range: 0.5V to VOUT VOUT Range: 2.5V to 5.5V 100mA Output from a Single AA Cell Input 400mA Output from a Dual AA Cell Input 500mA Output from a Single Li+ Cell Input High Efficiency: Up to 93% Efficiency Low Start-Up Voltage: 0.85V Typical Internal Synchronous Rectifier ▪ VOUT ≤ 4.5V: No External Schottky Diode Fixed Frequency Pulse Width Modulation (PWM) CurrentMode Control Scheme with Internal Compensation 1.2MHz Fixed Switching Frequency 1.2A Current Limit Light Load Mode Operation Over-Current Protection EMI Reduction Anti-Ringing Control Circuitry Low Shutdown Current: