AAT1100

Advanced Analog Technology, Inc. AAT1100 Product information presented is current as of publication date. Details are subject to change without notice TRIPLE-CHANNEL PWM CONTROLLER Features z z z z z z z z z z z Complete PWM Power Control Circuitry Precision Reference¡G 1.25V±1% (25 oC) Low Operating Voltage¡G 2.5V to 7.0V Under-Voltage Lockout Protection Totem Pole Output Output Short Circuit Protection Low Dissipation Current¡G 2.5mA at 500 kHz and 50% Duty Cycle Separate On / Off Control for CH1, CH3 Pair and CH2 (Refer to Function Table) Dead Time Control¡G 0 to 100% Wide Operating Frequency¡G 50 kHz to 1MHz Minimized External Components General Description The AAT1100 provides an integrated triple-channel pulse-width-modulation (PWM) solution for the power supply of DC-DC system; this device offers system engineer the flexibility to custom-make the power supply circuitry to a specific application. Each channel contains its own error amplifier, PWM comparator, dead–time control (DTC) and output driver. The under-voltage protection, oscillator, short circuit protection and voltage reference circuit are common features of the three channels. The AAT1100 contains two boost circuits (CH1, CH3) and a buck-boost circuit (CH2). DTC can be set to provide 0% to 100% dead-time through a divider network. Soft-Start can be implemented by paralleling the DTC resistor with a capacitor. Two DTC inputs are assigned for CH1, CH3 pair and CH2 individually, and DTC inputs can be used to c...