40V, 1A Synchronous Buck Regulator with Ultralow Quiescent Current

ARG81800

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The ARG81800 is a synchronous buck regulator ideal for "keep-alive" applications, offering ±1.5% output voltage accuracy and ultralow quiescent current (8µA) for minimal power consumption during light-load operation. Features include programmable switching frequency, synchronization, and comprehensive protection.

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Top Features

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
Enable input can command ultralow 1 μA shutdown current
Open-drain PGOOD output with rising delay
Pre-bias startup allows quick restart and avoids reset
Overvoltage, pulse-by-pulse current limit, hiccup mode short circuit, and thermal protections
Robust FMEA: pin open/short and component faults