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A8660

Allegro
Part Number A8660
Manufacturer Allegro
Description Synchronous Buck Controller
Published May 15, 2019
Detailed Description A8660 Wide Input Voltage, Adjustable Output, Synchronous Buck Controller with PWM Frequency Dithering, Synchronization,...
Datasheet PDF File A8660 PDF File

A8660
A8660

Overview
A8660 Wide Input Voltage, Adjustable Output, Synchronous Buck Controller with PWM Frequency Dithering, Synchronization, and NPOR FEATURES AND BENEFITS • Automotive AEC-Q100 qualified • Wide operating voltage range: 3.
0 to 45 V • Adjustable output voltage • PWM frequency dithering reduces EMI/EMC signature and minimizes input filtering • Programmable base frequency (fOSC): 200 kHz to 2.
2 MHz • For low frequency, high current designs (<520 kHz), applying a clock to SYNCIN will synchronize the PWM frequency to avoid AM band harmonic interference • Soft recovery from dropout avoids overshoot of VOUT • External compensation provides flexibility to tune the system for maximum stability or optimum transient response • Adjustable soft-start time controls inrush current to accommodate a wide range of output capacitances • Pre-bias startup allows quick, monotonic restart and avoids reset • High-voltage ENBAT input for ignition/key control • Logic enable (EN) input for microcontroller or DSP control • NPOR open-drain output with adjustable rising delay • Overvoltage, pulse-by-pulse current limit, hiccup mode short circuit, and thermal protections • Robust FMEA: pin open/short and component faults APPLICATIONS • Infotainment • Navigation systems • Instrument clusters • Audio systems • ADAS applications • Battery-powered systems • Industrial systems • Network and telecom • Home audio • HVAC systems DESCRIPTION Designed to satisfy the power supply requirements of automotive, industrial, and consumer applications, the A8660 includes all the control and protection circuitry to produce a robust PWM controller delivering high current.
The A8660 includes PWM frequency dithering, which has been shown to reduce EMI/EMC.
A soft recovery feature prevents output voltage overshoot when the converter comes out of a low VIN dropout condition.
For high current, low frequency designs (<520 kHz), an external clock can be applied to the SYNCIN pin to shift the PWM harmonics, thus avoiding AM...


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