3MHz Fast Transient 400mA Step-Down Converter

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Manufacturer Skyworks


Description :

The AAT1149 SwitchReg is a 3.0MHz step-down converter with an input voltage range of 2.7V to 5.5V and output voltage as low as 1.0V. It is optimized to react quickly to load variations and operate with a tiny 0603 inductor that is only 1mm tall. The AAT1149 output voltage is programmable via external feedback resistors. It can deliver 400mA of load current while maintaining a low 45µA no load quiescent current. The 3.0MHz switching frequency minimizes the size of external components while keeping switching losses low. The AAT1149 maintains high efficiency throughout the operating range, which is critical for portable applications. The AAT1149 is available in a Pb-free, space-saving 2.0x2.1mm SC70JW-8 package or a 5-pin wafer-level chip scale (WLCSP) package and is rated over the -40°C to +85°C temperature range.

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    • Ultra-Small 0603 Inductor (Height = 1mm)
    • VIN Range: 2.7V to 5.5V
    • VOUT Adjustable from 1.0V to VIN
    • 400mA Max Output Current
    • Up to 98% Efficiency
    • 45μA No Load Quiescent Current
    • 3.0MHz Switching Frequency
    • 70μs Soft Start
    • Fast Load Transient
    • Over-Temperature Protection
    • Current Limit Protection
    • 100% Duty Cycle Low-Dropout Operation
    • <1μA Shutdown Current
    • SC70JW-8 or 0.9x1.2mm WLCSP Package
    • Temperature Range: -40°C to +85°C

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Features Similar products
Control scheme Slope Compensated Peak Current Mode Control  

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Switching frequency (kHz) 3000  
Max Input Voltage (V) 2.7 to 5.5  
Output Voltage (V) 1 to 5.5  
Typ. Active Current (µA) 45  
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