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

Offers a Unique Combination of Wide VIN Range, Low IQ, High Duty Cycle, and Small Solution Size

Product Details

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.

Key Features

  • 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

Applications/Uses

  • Point-of-Load Applications
  • Portable Devices Powered from 2s, 3s, or 4s Li+ Batteries
  • USB Type-C Devices
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 24
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 0.3
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1700
Design Tools EE-Sim
Package/Pins TDFN/10
Budgetary
Price (See Notes)
$0.49 @1k
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Simplified Block Diagram

MAX77596: Block Diagram MAX77596: Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX77596 evaluation kit (EV kit) demonstrates the MAX77596 synchronous step-down converter IC with integrated switches. The EV kit operates over a wide input range of 3.5V to 24V and can support loads up to 300mA. The EV kit comes standard with the 3.3V fixed output voltage version of the IC. It can be easily modified to evaluate the 5V fixed output version or the adjustable output voltage version.

The EV kit includes jumpers to enable or disable the device, as well as to select either forced-PWM mode (FPWM) or skip-mode operation. A RESETB test point is available to monitor the voltage quality of the converter’s output.

View Details

Features

  • Evaluates Both Fixed-Output and Adjustable-Output Versions (3.3V Version Is Preinstalled)
  • 3.5V to 24V Input Voltage Range
  • 300mA Maximum Load
  • Demonstrates 1.1µA Quiescent Current at 14V Input
  • Active-Low RESET Output Test Point
  • Simple Two-Layer Board Serves as a Reference Design
  • Proven PCB Layout
  • Fully Assembled and Tested

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Tools & Models

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 24
VOUT1 (V) (min) 1
VOUT1 (V) (max) 10
IOUT1 (A) (max) 0.3
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Synchronous Switching? Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1700
Design Tools EE-Sim
Package/Pins TDFN/10
Budgetary
Price (See Notes)
$0.49 @1k

Key Features

  • 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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX77596: Block Diagram MAX77596: Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal