1A, 1.2MHz Synchronous Boost Converter

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Manufacturer Skyworks


Description :

The AAT1218 is a general purpose DC/DC synchronous boost (step-up) converter providing a tightly regulated DC output voltage for continuous output currents up to 1A (minimum). Operating input voltage must be less than the output voltage and in the 0.5V to 5.5V range, making the device well suited to portable equipment and consumer appliances. The boost output voltage is programmed from 2.5V to 5.5V with an external resistor divider. Optimized internal compensation provides fast transient response with no external components. Synchronous rectification eliminates the need for an external rectifier for output voltage less than 4.5V. Low on-resistance internal switches provide efficiency up to 95%, which minimizes losses and simplifies packaging and circuit board layout. An inductor, two resistors and two ceramic output capacitors are all that are required to implement a DC/DC boost solution. The switching frequency is internally set to 1.2MHz to minimize external filter size and optimize switching losses. Integrated soft-start ensures minimal inrush current. The "anti-ring" circuit reduces stray EMI during light load, discontinuous operation. Input quiescent current is less than 400µA at no load. The device provides cycle-by-cycle current limit and over-temperature protection to prevent device over-stress. The AAT1218 is available in a Pb-free, 12-pin low profile TDFN33 package rated from -40°C to 85°C.

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Technical Data :

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    • 2.5V to 5.5V Adjustable Output Voltage
    • 0.5V Minimum Input Voltage
    • ±2% Output Accuracy
    • No Schottky Diode Required (VOUT < 4.5V)
    • Up to 95% Efficiency
    • 400μA Standby Current
    • <1μA Shutdown Current
    • Integrated Soft-Start Circuitry Limits Inrush Current
    • Constant Frequency 1.2MHz Operation
    • Inductor Height <1.8mm
    • Small Ceramic Capacitors
    • Anti-ring Circuit Reduces EMI
    • Current Mode Control
    • Fast, Stable Transient Response
    • No External Compensation
    • Cycle-by-Cycle Current Limit
    • Low Inrush Current with 0.7ms Soft-start
    • Low Output Ripple: <80mVpp for all Loading Conditions (BW = 25MHz)
    • Over-Temperature Protection
    • Adjustable and Fixed Output Versions Available
    • Delivers 1A to 5V Output from a Single Cell Li+ Battery
    • Low-profile TDFN33-12 Package

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Features Similar products
Control scheme Slope Compensated Current Mode Control  

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Switching frequency (kHz) 1200  
Max Input Voltage (V) 0.5 to 5  
Output Voltage (V) 2.5 to 5.5  
Typ. Active Current (µA) 300  
Typ. Output Voltage Accuracy (%) ± 2  
Output Capacitor Type 10 to 47 μF, X5R or X7R Ceramic Capacitor  
Output Current (mA) 1000 Min  
Operating Temperature (°C) -40 to +85  
Package TDFN33-12