24V, 300mA, Buck Converter with 1.1μA I

The MAX77596 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 24V, 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 and 5V output versions, as well as an adjustable version. The adjustable version allows the user to program the output voltage between 1V and 10V by using a resistor-divider. 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 MAX77596 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

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

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

* VIN Range: 3.5V to 24V

* Up to 300mA Output Current

* Fixed 3.3V, 5V, or Programmable 1V to 10V 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 (3.3V Fixed Output Voltage)

* 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