Skyworks AAT2782

Description

The AAT2782 provides three independently regulated DC outputs: two step-down (Buck) regulators and a single low input voltage, low drop-out (LDO) regulator. The input voltage range for the step-down regulators is2.7V to 5.5V, while the LDO regulator allows inputs from 1.5V to 5.5V. The low input voltage LDO regulator allows high efficiency, step-down, low noise outputs. In addition, the LDO input may be connected to step-downoutputs 1 or 2.

The Channel 1 and 2 step-down regulators can deliver up to 1200mA and 600mA output current, respectively. Step-down output voltages are set with external resistors. Switching frequency is set at 1.3MHz to ensure small external filtering components. Current mode control assures fast transient response and stable operation across the operating range. The Channel 3 LDO regulator can deliver up to 400mA with -80dB power supply rejection ratio (PSRR) and 65μVRMS output noise with an optional bypass capacitor. The LDO output voltage is factory set with a default voltage of 1.20V. Independent enable and input pins are provided. The device consumes low quiescent current and provides high efficiency across the load range for maximum life in battery systems.

The AAT2782 is available in the Pb-free, 16-pin TDFN34 package and is rated over the -40°C to 85°C operating temperature range.

Features

• VIN Range Step-Down (Buck): 2.7V to 5.5V
• VIN Range Low Drop-Out (LDO): 1.5V to 5.5V
• Output Voltage Range: 0.6V to VIN
• Step-Down Output Current:
• Channel 1: 1200mA
• Channel 2: 600mA
• LDO Output Current:
• Channel 3: 400mA
• High Efficiency with Low RDS(ON) Switches
• Step-Down up to 97%
• LDO Regulator up to 80%
• Total Quiescient Current 170μA
• Shutdown Current: 1μA
• Step-Down Converters
• 1.3MHz Switching Frequency
• Current Mode Control
• Cycle-by-Cycle Current Limit
• High Efficiency Light-Load Mode Operation
• LDO Converter
• Ultra Low Noise with Bypass Capacitor
• Over-Current Protection
• 200μs Internal Soft Start
• Over-Temperature Protection
• TDFN34-16 Low Profile Package
• -40°C to 85°C Temperature Range
• The inductor should be set equal to the output voltage-numeric value in μH

Typical applications

• Microprocessor / DSP Core / IO Power
• Portable Media Players
• PDAs and Handheld Computers
• Wireless Data Systems
• Cellular and SmartPhones

More information

• Datasheet
• IC product information