Fast Transient 400mA Step-Down DC/DC Converter

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Manufacturer Skyworks


Description :

The AAT1146 SwitchReg is a 1.4MHz step-down converter with an input voltage range of 2.7V to 5.5V and output voltage as low as 0.6V. It is optimized to react quickly to a load variation. The AAT1146 is available in fixed voltage versions with internal feedback and a programmable version with external feedback resistors. It can deliver 400mA of load current while maintaining a low 27μA no load quiescent current. The 1.4MHz switching frequency minimizes the size of external components while keeping switching losses low. The AAT1146 is designed to maintain high efficiency throughout the operating range, which is critical for portable applications. The AAT1146 is available in the Pb-free, space-saving 2.0x2.1mm SC70JW-8 and SOT23-5 packages and is rated over the -40°C to +85°C temperature range.

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    • VIN Range: 2.7V to 5.5V
    • VOUT Fixed or Adjustable from 0.6V to VIN
    • 27μA No Load Quiescent Current
    • Up to 98% Efficiency
    • 400mA Max Output Current
    • 1.4MHz Switching Frequency
    • 120μs Soft Start
    • Fast Load Transient
    • Over-Temperature Protection
    • Current Limit Protection
    • 100% Duty Cycle Low-Dropout Operation
    • <1μA Shutdown Current
    • SC70JW-8 and SOT23-5 Packages
    • Temperature Range: -40°C to +85°C

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Control scheme Slope Compensated Peak Current Mode Control  

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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) 27  
Output Capacitor Type 4.7 to 10 μF, X5R or X7R Ceramic Capacitor  
Output Current (mA) 400  
Operating Temperature (°C) -40 to +85  
Package SC70JW-8