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AAT2786 Datasheet(PDF) 1 Page - Advanced Analogic Technologies |
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AAT2786 Datasheet(HTML) 1 Page - Advanced Analogic Technologies |
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1 / 27 page  AAT2786 1.5A Step-Down Converter and 150mA LDO SystemPower TM PRODUCT DATASHEET 2786.2008.04.1.0 1 www .analogictech.com General Description The AAT2786 is a dual output power solution. It includes a 1.5A, 1.4MHz, high-efficiency step-down converter and a high performance 150mA LDO regulator. The step- down regulator output voltage is adjustable from 0.6V to VIN. The LDO regulator has a factory preset fixed output voltage from 1.2V to 3.3V. The step-down converter consumes only 42µA of no-load quiescent current and is designed to maintain high effi- ciency throughout the load range. The step-down con- verter has ultra-low RDS(ON) integrated MOSFETs and can operate up to 100% duty cycle to enable high output voltage, high current applications which require a low dropout threshold. The AAT2786 provides excellent tran- sient response and high output accuracy across the operating range. Pulling the MODE/SYNC pin high enables “PWM Only” mode, maintaining constant fre- quency and low output ripple across the operating range. Alternatively, the converter may be synchronized to an external clock input via the MODE/SYNC pin. The MicroPower low dropout linear regulator in the AAT2786 has been specifically designed for high-speed turn-on and turn-off performance, fast transient response, and good noise and power supply ripple rejection (PSRR), making it ideal for powering sensitive circuits with fast switching requirements. Over-temperature and short-circuit protection safeguard the AAT2786 and system components from damage. Features • VIN Range : 2.5V to 5.5V • 1.5A Step-Down Converter ▪ VOUT Range: 0.6V to VIN ▪ 95% Peak Efficiency ▪ High Efficiency across load range ▪ 42µA No Load Quiescent Current ▪ Optional “PWM Only” Low Noise Mode ▪ Current limit and soft start • 150mA LDO Regulator ▪ VOUT Range: 1.2V to 3.3V (Fixed) ▪ High Power Supply Rejection Ratio ▪ Low Output Noise • Independent Enable Pins • Integrated Power MOSFETs • Over-Temperature Protection • TDFN34-16 Package • -40°C to +85°C Temperature Range Applications • Cellular and Smart Phones • PDAs, Palmtops • Digital Still and Video Cameras • Portable Instruments • Battery-Powered Applications Typical Application R2 Adj R3 59k C8 10nF C6 1µF 3.3µH L1 C1 opt C7 2.2µF BUCK OUT LDO OUT LDO IN BUCK IN C5 Opt C4 22µF C3 1µF R1 100 C2 10µF VIN 12 MODE/SYNC 14 VP 16 VP 15 LDOIN 11 BUCK_EN 13 LDO_EN 9 N/C 10 LDO_OUT 6 BYP 8 LX 2 LX 1 GND 4 PGND 3 LDO_GND 7 FB 5 AAT2786IRN U1 ON/OFF ON/OFF ON/OFF |
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