DATA SHEET AAT1217 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter General Description Features The AAT1217 is a high efficiency, synchronous, fixed V Operation Range: 0.5V to V IN OUT frequency, step-up converter designed for single-cell or V Range: 2.5V to 5.5V OUT dual-cell alkaline, NiMH, or NiCd battery-powered appli- 100mA Output from a Single AA Cell Input cations. The high 1.2MHz switching frequency and com- 400mA Output from a Dual AA Cell Input pletely integrated control circuitry minimize the total 500mA Output from a Single Li+ Cell Input solution footprint area while maintaining excellent regu- High Efficiency: Up to 93% Efficiency lation, ripple, and transient response throughout the full Low Start-Up Voltage: 0.85V Typical load range. Internal Synchronous Rectifier V 4.5V: No External Schottky Diode OUT Light load mode operation and low quiescent current Fixed Frequency Pulse Width Modulation (PWM) Current- allow the AAT1217 to maintain high efficiency perfor- Mode Control Scheme with Internal Compensation mance for light load conditions. With a 1.2A peak induc- 1.2MHz Fixed Switching Frequency tor current limit, the AAT1217 is capable of delivering 1.2A Current Limit 100mA to the load from a single AA cell, 400mA from Light Load Mode Operation dual AA cells, or up to 500mA from a single-cell lithium- Over-Current Protection ion battery. The AAT1217 has a 0.85V start-up voltage EMI Reduction Anti-Ringing Control Circuitry with operation down to 0.5V. Low Shutdown Current: <1.0A The AAT1217 is available in a Pb-free, space-saving low -40C to +85C Ambient Temperature Range profile (1mm) 6-pin TSOT23 or 6-pin SOT23 package Low Profile (1mm) TSOT23-6 or SOT23-6 Package and is rated over the -40C to +85C ambient tempera- ture range. Applications Cellular and Smart Phones Digital Still and Video Cameras Microprocessors and DSP Core Supplies MP3 Player Portable Instruments Wireless and DSL Modems Typical Application L1 L1 4.7H 4.7H SW V SW IN V V OUT IN V OUT 0.85V 3.3V,100mA 0.85V 3.3V,100mA VIN VOUT VIN VOUT R3 R3 C OUT 1M AAT1217-1.2 R1 C 1M AAT1217-3.3 OUT C 4.7F IN 1.02M C IN 4.7F 4.7F 4.7F FB SHDN FB SHDN R2 GND 604k GND Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 202050B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. March 19, 2013 DATA SHEET AAT1217 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter Pin Descriptions Pin Symbol Function 1 SW Power Switch Pin. Ties to the drains of the PMOS synchronous recti er and the NMOS switch. 2 GND Ground Pin Feedback Input Pin. Connect FB to the center point of the external resistor divider. The feedback threshold 3FB voltage is 1.23V. 4 SHDN Shutdown Signal Input. Logic high enables the IC. Logic low disables the IC. Shutdown current is <1A. 5 VOUT Power Output Pin. Tied to the source of the PMOS synchronous recti er. 6 VIN Power Supply Input. Must be closely decoupled to GND, Pin 2, with a 4.7F or greater ceramic capacitor. Pin Configuration TSOT23-6/SOT23-6 (Top View) 1 6 VIN SW 2 5 VOUT GND 3 4 SHDN FB Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 202050B Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice. March 19, 2013