MAX16976

28V, 600mA Automotive Step-Down Converter with Low Operating Current

Versatile 600mA Automotive-Grade Buck

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Overview

Wide 3.5V to 28V Input Voltage Range
42V Input Transient Tolerance
5V Fixed or 1V to 10V Adjustable Output Voltage
Integrated 600mA High-Side Switch
220kHz to 1.0MHz Adjustable Switching Frequency
Frequency Synchronization Input
Internal Boost Diode
45µA Skip-Mode Operating Current
Less than 10µA Shutdown Current
Adjustable Power-Good Output Level and Timing
3.3V Logic Level to 42V Compatible Enable Input
Current-Limit, Thermal Shutdown, and Overvoltage Protections
-40°C to +125°C Automotive Temperature Range

The MAX16976 is a 600mA current-mode step-down converter with an integrated high-side switch. The device operates with input voltages from 3.5V to 28V while using only 45µA quiescent current at no load. The switching frequency is adjustable from 220kHz to 1.0MHz by using an external resistor and can be synchronized to an external clock. The device’s output voltage is pin-selectable to a fixed 5V or adjustable from 1V to 10V using external resistors. The wide input voltage range makes the device ideal for automotive and industrial applications.

The device operates in skip mode for reduced current consumption in light-load conditions. An adjustable reset threshold helps keep microcontrollers alive down to the lowest specified input voltage. Protection features include cycle-by-cycle current limit, soft-start, overvoltage, and thermal shutdown with automatic recovery. The device also features a power-good monitor to ease power-supply sequencing.

The device operates over the -40°C to +125°C automotive temperature range and is available in a 16-pin QSOP package.

Applications