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AAT1217ICA-1.2-T1 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT1217ICA-1.2-T1 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
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1 / 13 page  AAT1217 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter SwitchRegTM PRODUCT DATASHEET 1217.2008.03.1.3 1 www .analogictech.com 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 appli- cations. The high 1.2MHz switching frequency and com- pletely integrated control circuitry minimize the total solution footprint area while maintaining excellent regu- lation, ripple, and transient response throughout the full load range. Light load mode operation and low quiescent current allow the AAT1217 to maintain high efficiency perfor- mance for light load conditions. With a 1.2A peak induc- tor 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 lithium- ion 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 tempera- ture range. 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) Current- Mode 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: <1.0μA • -40°C to +85°C Ambient Temperature Range • Low Profile (1mm) TSOT23-6 or SOT23-6 Package 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 FB VIN SHDN GND VOUT AAT1217-1.2 CIN 4.7μF VIN 0.85V VIN 0.85V L1 4.7μH R1 1.02M R2 604k VOUT 3.3V,100 mA SW R3 1M Ω COUT 4.7μF FB VIN SHDN GND VOUT AAT1217-3.3 CIN 4.7μF L1 4.7μH VOUT 3.3V, 100 mA SW R3 1M Ω COUT 4.7μF |
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