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

The MAX77597 is a small, synchronous buck converter with integrated 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 version). Voltage quality can be monitored by observing the active-low RESET signal. The device can operate near dropout by running at 98% duty cycle, making it ideal for battery-powered applications.

The device offers fixed 3.3V. Frequency is fixed at 1.7MHz, which allows for small external components and reduced output ripple. The device offers both forced-PWM and skip modes of operation, with ultra-low quiescent current of 1.1µA in skip mode.

The MAX77597 is available in a small (2mm x 2.5mm) 10-pin TDFN package and operates across the -40°C to +85°C temperature range.

Applications

* Portable Devices Powered from 2s, 3s, or 4s Li+ Batteries * USB Type-C Devices * Point-of-Load Applications

* Flexible Power for Systems That Require a Wide Input Voltage Range

* VIN Range: 3.5V to 36V

* Up to 300mA Output Current

* Fixed 3.3V Output Voltage

* 98% (Max) Duty Cycle Operation with Low Dropout

* Operates from 5V, 12V, or 20V USB Type-C Input Power

* Operates from 2S, 3S, or 4S Li-Ion Battery

* Minimizes Power Consumption and Extends Battery Life

* 1.1µA Quiescent Current

* 86% Peak Efficiency at 12VIN, 3.3VOUT

* Minimizes Solution Size

* 1.7MHz Operating Frequency

* Small 2.0mm x 2.5mm x 0.75mm 10-Pin TDFN Package

* Robust Solution

* Short-Circuit, Thermal Protections

* 6.67ms Internal Soft-Start Minimizes Inrush Current

* Current-Mode Control Architecture

* Up to 42V Input Voltage Tolerance