General Description

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 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 cur-

rent 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

Benefits and Features

● Flexible Power for Systems That Require a Wide

Input Voltage Range

• 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 (3.3V Fixed Output

Voltage)

● 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

19-100785; Rev 1; 4/20

Ordering Information appears at end of data sheet.

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MAX77597

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