600mA Voltage-Scaling Step-Down DC/DC Converter

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Manufacturer Skyworks


Description :

The AAT1171 SwitchReg™, a member of AnalogicTech's Total Power Management IC™ (TPMIC™) product family, has been specifically designed to dynamically control the operating voltage of a WCDMA or CDMA power amplifier inside single lithium-ion battery-powered systems. The AAT1171 outputs a voltage between 0.6V and 3.6V, thereby optimizing the amplifier efficiency at both low and high transmit levels. The AAT1171 output voltage is controlled via an analog signal from the baseband processor. It can deliver 600mA of continuous load current while maintaining a low 45µA of no load quiescent current. The 2MHz switching frequency minimizes the size of external components while keeping switching losses low. A low resistance MOSFET, typically 230mΩ, provides a low dropout voltage as the battery input voltage approaches the programmed output voltage and the converter runs at 100% duty cycle. To further improve system efficiency, an 85mΩ bypass MOSFET transistor is also included to allow the PA to be powered directly from the battery. The AAT1171 feedback and control method gives excellent load regulation and transient response while maintaining small external components. The output voltage responds in less than 30µs. The converter can be synchronized to an external system clock, forced to operate in Light Load (LL) mode for highest efficiency at light loads, or in Pulse Width Modulation (PWM) mode for low noise operation. The AAT1171 is available in a Pb-free, space-saving TDFN33-12 package and is rated over the -40°C to +85°C temperature range.

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    • VIN Range: 2.7V to 5.5V
    • Variable Output Voltage: 0.6V to 3.6V
    • 600mA Output Current
    • DAC Input: 0.2V to 1.2V
    • High Output Accuracy: ±3%
    • 45μA No Load Quiescent Current
    • Internal Soft Start Limits Startup Current and Output Voltage Overshoot
    • Synchronizable to External 19.8MHz System Clock
    • Over-Temperature and Current Limit Protection
    • Integrated 85mΩ Bypass MOSFET
    • 2MHz Operation
    • PWM/LL Control with Override
    • Fast Start-Up:
    • 50μs (AAT1171-4, AAT1171-5)
    • 150μs (AAT1171-1)
    • 100% Duty Cycle Operation
    • <30μs Output Voltage Response Time
    • 3x3mm 12-Pin TDFN or 1.5x2.2mm 12-Pin 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) 2000  
Max Input Voltage (V) 2.7 to 5.5  
Output Voltage (V) 0.6 to 3.6  
Typ. Active Current (µA) 420  
Typ. Output Voltage Accuracy (%) ± 3  
Output Capacitor Type 4.7 μF 10 V, X5R Ceramic Capacitors  
Output Current (mA) 600  
Operating Temperature (°C) -40 to +85  
Package WLCSP-12