Low Noise, High Frequency Dual Step-Down Converter

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Manufacturer Skyworks


Description :

The AAT2789 is a 2-channel synchronous step-down converter operating from an input voltage range of 2.7V to 5.5V, making it the ideal choice for single-cell Lithium-ion/polymer battery powered systems or low voltage 3.3V and 5V based consumer equipment. Channel 1 delivers up to 1700mA output current while Channel 2 delivers up to 800mA. Both converters incorporate a unique low noise architecture which reduces output ripple and spectral noise. The AAT2789 uses a high switching frequency to minimize external filter sizing. Peak current mode control eliminates external compensation while optimizing transient performance and stability. The AAT2789 requires a minimum of external components to realize a high efficiency dual-output step-down converter while minimizing solution size and footprint. Each of the step-down regulators has an independent input and enable pin. Externally adjustable output voltage is provided. Light load operating mode provides high efficiency over the entire load range. Low quiescent current enables excellent life for battery powered systems. The AAT2789 is available in a 3x4mm Pb-free 16-pin TDFN package and is rated over the -40°C to 85°C operating temperature range.

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    • VIN Range: 2.7V to 5.5V
    • Output Voltage Range: 0.6V to VIN
    • Low Noise Light Load Mode
    • Low Ripple PWM Mode
    • Output Current:
    • Channel 1: 1700mA
    • Channel 2: 800mA
    • Highly Efficient Step-Down Converters
    • Low RDS(ON) Integrated Power Switches
    • 100% Duty Cycle
    • High Switching Frequency
    • Peak Current Mode Control
    • Internal Compensation
    • Excellent Transient Response
    • Internal Soft Start
    • Fast Turn-On Time
    • Over-Temperature Protection
    • Current Limit Protection
    • Low Profile TDFN34-16 Package
    • -40°C to 85°C Temperature Range

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Features Similar products
Control scheme Peak Current Mode  

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Switching frequency (kHz) 1400  
Max Input Voltage (V) 2.7 to 5.5  
Output Voltage (V) 0.6 to 5.5  
Typ. Active Current (µA) 42  
Output Capacitor Type 10 to 22 μF, X5R or X7R Ceramic Capacitor (Channel 1), 4.7 to 10 μF, X5R or X7R Ceramic Capacitor (Channel 2)  
Output Current (mA) 1700 (Channel 1), 800 (Channel 2)  
Operating Temperature (°C) -40 to +85  
Package TDFN34-16