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ARG81800

Allegro
Part Number ARG81800
Manufacturer Allegro
Description 40V 500mA / 1.0A Synchronous Buck Regulators
Published Nov 20, 2019
Detailed Description ARG81800 40 V, 500 mA / 1.0 A Synchronous Buck Regulators with Ultralow Quiescent Current, SYNCIN, CLKOUT, and PGOOD F...
Datasheet PDF File ARG81800 PDF File

ARG81800
ARG81800

Overview
ARG81800 40 V, 500 mA / 1.
0 A Synchronous Buck Regulators with Ultralow Quiescent Current, SYNCIN, CLKOUT, and PGOOD FEATURES AND BENEFITS • Automotive AEC-Q100 qualified • Input operating voltage range: 3.
5 to 36 V □□Withstands surge voltages to 40 V for load dump • Low-Power (LP) mode—draws just 8 µA from VIN while maintaining 3.
3 or 5.
0 VOUT • AUTO mode allows automatic transition between PWM and LP mode based on load current • Programmable PWM frequency (fSW): 250 kHz to 2.
4 MHz • PWM frequency dithering and controlled switch node slew rate reduce EMI/EMC signature • CLKOUT allows interleaving and dithering of “downstream” regulators using their synchronization inputs • Interleaving minimizes input filter capacitor requirement and improves EMI/EMC performance • Synchronization of PWM frequency to external clock on SYNCIN pin • Adjustable output voltage: ±1.
5% accuracy over operating temperature range (‒40°C to 150°C) • Maximized duty cycle at low VIN improves dropout • Soft recovery from dropout condition • Adjustable soft-start time controls inrush current to accommodate a wide range of output capacitances • External compensation provides flexibility to tune the system for maximum stability or fast transient response Continued on next page.
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APPLICATIONS • Infotainment • Navigation Systems • Instrument Clusters • Audio Systems • ADAS Applications • Battery Powered Systems • Industrial Systems • Network and Telecom • Home Audio • HVAC Systems DESCRIPTION TheARG81800 includes all the control and protection circuitry to produce a PWM regulator with ±1.
5% output voltage accuracy, with ultralow quiescent current to enable “keepalive” supply operation with minimal current draw from the supply during very light load regulation.
There are two versions of the ARG81800 available, 500 mA and 1 A, so the physical size of the power components can be optimized for lower current systems, thus reducing PCB area and saving cost.
PWM switching freq...


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