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AAT1217 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT1217 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
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1 / 13 page  General Description TheAAT1217 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 cir- cuitry minimize the total solution footprint area while maintaining excellent regulation, ripple, and transient response throughout the full load range. Pulse skipping mode operation and low quiescent current allow the AAT1217 to maintain high effi- ciency performance for light load and sleep mode conditions. With a 1.2A peak switch current limit, theAAT1217 is capable of delivering 100mAto the loadfromasingleAAcellorupto400mAfromdual AA cells. The AAT1217 has a 0.85V start-up volt- age with operation down to 0.5V. TheAAT1217 is available in a Pb-free, space-sav- ing low profile (1mm) 6-pin TSOT23 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 • 100mAOutput from a SingleAACell Input • 400mAOutput from a DualAACell 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 • 1.2ACurrent Limit • Light Load Pulse Skipping Mode Operation • Low 80µANo Load Input Current • Over-Current Protection • EMI ReductionAnti-Ringing Control Circuitry • Low Shutdown Current: <1.0µA • -40°C to +85°CAmbient Temperature Range • Low Profile (1mm) TSOT23-6 Package Applications • Cellular and Smart Phones • Digital Still and Video Cameras • Microprocessors and DSP Core Supplies • MP3 Player • Portable Instruments • Wireless and DSLModems AAT1217 600mA, 1.2MHz, Micropower Synchronous Step-Up Converter TypicalApplication FB VIN SHDN GND VOUT AAT1217-1.2 CIN 4.7µF VIN: 0.85V L1 4.7µH R1 1.02MΩ R2 604kΩ VOUT: 3.3V,100mA SW R3 1MΩ COUT 4.7µF FB VIN SHDN GND VOUT AAT1217-3.3 CIN 4.7µF VIN:0.85V L1 4.7µH VOUT: 3.3V,100mA SW R3 1MΩ COUT 4.7µF 1217.2007.07.1.0 1 SwitchReg™ |
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