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AAT1276ITP-5.0-T1 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT1276ITP-5.0-T1 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 18 page  AAT1276 Boost Converter with USB Power Switch SwitchRegTM PRODUCT DATASHEET 1276.2007.11.1.1 9 www .analogictech.com AAT1276 Boost Converter with USB Power Switch SwitchRegTM PRODUCT DATASHEET 1276.2007.11.1.1 9 www .analogictech.com Functional Description The AAT1276 is a 500mA synchronous boost converter with a current-limited load switch targeted for single-cell Lithium-ion/polymer devices acting as a portable host for USB power. The AAT1276 has integrated control and synchronous MOSFETs, minimizing the cost and the number of exter- nal components. Additional features include a soft-start function which allows the load voltage to ramp up in a controlled manner, eliminating output voltage overshoot and minimizing inrush current. Typical soft-start time for the boost converter is approximately 300μs. The AAT1276 also has a load switch with user-program- mable current limiting. The load switch reports over- current and over-temperature conditions through an open-drain fault reporting signal (FLT). The fault report- ing signal has a 4ms turn-on delay. Control Scheme The control circuit uses hysteretic current mode control with internal inductor current sensing for very high effi- ciency over a wide output current range. For heavy load, the boost converter operates in continuous conduction mode (CCM). This minimizes the RMS current and opti- mizes the efficiency at load conditions where the losses are dominated by the power MOSFET RDS(ON). This also keeps the ripple current to a minimum and minimizes the output voltage ripple and the output capacitor size. A zero current comparator senses the inductor current and prevents reverse current flow for optimum light load efficiency. Functional Block Diagram Boost Regulator Control Load Switch Control FLT SET EN VCC IN OUT2 FB OUT1 SW LIN GND |
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