GENERAL DESCRIPTION
This device operates with an input-voltage supply from 3.5V to 42V and can operate in dropout conditions by running at 97% duty cycle. It is intended for applications with mid- to high-power requirements that operate at a wide input voltage range, such as during automotive cold-crank or engine stop-start conditions. The step-down controllers operate at a frequency of up to 2.2MHz to allow small external components and reduced output ripple, and to guarantee no AM band interference. The switching frequency is resistor-adjustable (220kHz to 2200kHz). SYNC input programmability enables three frequency modes for optimized performance: forced fixedfrequency operation, skip mode with ultra-low quiescent current, and synchronization to an external clock. The ICs have a spread-spectrum pin for frequency modulation to minimize EMI interference. The ICs will be offered with a synchronous step-up controller. This preboost circuitry turns on during low inputvoltage conditions, and is designed to provide power to step-down controller channels with input voltages as low at 2V.
Analog Devices
