36V, 300mA, Mini Buck Converter with 1.1µA I

The MAX16956 is a small, synchronous buck converter with integrated high-side and low-side switches. The device is designed to deliver up to 300mA with input voltages from 3.5V to 36V, while using only 1.1µA quiescent current at no load (fixed-output versions). Voltage quality can be monitored by observing the active-low RESET signal. The device can operate near dropout by running at 97% duty cycle, making it ideal for automotive applications under cold-crank.

The device offers fixed-output voltages of 5V and 3.3V, as well as an adjustable version. The adjustable version allows the user to program the output voltage between 1V and 15V by using a resistor-divider. Frequency is fixed at 2.1MHz, which allows for small external components, reduced output ripple, and minimized AM radio interference. The device offers both forced-PWM and skip modes of operation, with ultra-low quiescent current of 1.1µA in skip mode. The device can be ordered with spread-spectrum frequency modulation designed to minimize EMI-radiated emissions due to the switching frequency.

The MAX16956 is available in a small (3mm × 3mm) 10-pin µMAX® package and operates across the full automotive temperature range of -40°C to +125°C. The device is AEC-Q100 qualified. Applications

* Automotive Body ECUs * Distributed DC Power Systems * Point-of-Load Applications

* Integration and High-Switching Frequency Saves Space

* DC-DC Converter Up to 300mA Capability

* Fixed 5V/3.3V or Programmable Output-Voltage Options (1V to 15V)

* Current-Mode-Control Architecture

* 2.1MHz Operating Frequency

* Fixed 5.4ms Internal Soft-Start

* Spread-Spectrum Frequency Modulation Reduces EMI Emissions

* Low IQ Enables Designers to Meet Stringent OEM Module Power-Consumption Requirements

* 1.1µA Quiescent Current in Standby Mode (Fixed-Output-Voltage Versions Only)

* Wide Input Voltage Range Supports Automotive Applications

* Operating VIN Range: 3.5V to 36V (42V Tolerant)

* 97% (Max) Duty-Cycle Operation with Low Dropout

* Robust Performance Supports Wide Range of Automotive Applications

* Short-Circuit, Thermal Protections

* -40°C to +125°C Automotive Temperature Range

* AEC-Q100 Qualified