Quality Standards and Environmental Certifications

A8660: Wide Input Voltage, Adjustable Output, Synchronous Buck Controller with PWM Frequency Dithering, Synchronization, and NPOR

A8660 Datasheet

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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 band interference with a tuner or other sensitive electronics.

The A8660 has external compensation so it can be tuned to satisfy various system goals over a wide range of PWM frequencies and external components. It includes adjustable soft start to minimize inrush current. Additionally, it monitors the feedback voltage to provide an open-drain NPOR signal with adjustable delay time.

Extensive protection features of the A8660 include pulse-by pulse current limit, hiccup mode short-circuit protection, BOOT open/short voltage protection, VIN undervoltage lockout, VOUT overvoltage protection, and thermal shutdown. The A8660 is supplied in a low profile 20-pin QFN package (suffix “ES”) with exposed power pad.

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 capacitance
Pre-bias startup allows quick, monotonic restart and avoids reset
High-voltage ENBAT input for ignition/key control
Logic enable (ENB) 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

Part Number Specifications and Availability

Part Number	Package Type	Temperature	RoHS Compliant	Part Composition / RoHS Data	Comments	Samples	Check Stock
APEK8660KES-01-MH-10-410KHZ	DEMO BOARD	-20°C to 85°C	No	--	New	Contact your local sales rep	Check Distributor Stock
APEK8660KES-01-MH-5-22MHZ	DEMO BOARD	-20°C to 85°C	No	--		Contact your local sales rep	Check Distributor Stock
A8660KESTR-J	20-lead QFN	-40°C to 125°C	Yes	View Data		Contact your local sales rep	Check Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

The A8660 is supplied in a low profile 20-pin QFN package (suffix “ES”) with exposed power pad.

ES Package Documentation