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24V Input, 500mA Buck Regulator with Dual-Input Power MUX

Wide VIN Range, Low IQ Buck Integrates Ideal Diode ORing and Optional I2C Programmability

Product Details

The MAX77756 is a synchronous 500mA step-down DC-DC converter with integrated dual-input power multiplexer (MUX). The converter operates on an input supply as low as 3.0V and as high as 24V. Default output voltage is factory-programmed to either 1.8V, 3.3V, or 5.0V. Output voltage is further adjustable through external resistors or an I2C serial interface.

The dual-input power MUX selects the higher voltage from two different input sources to power the step-down converter. Control circuitry ensures that only one channel of the MUX is on at a time to prevent cross-conduction between input sources. For single-input applications, the MUX can be bypassed and the step-down converter can be powered directly from the SUP pin.

The MAX77756 is available in a small 2.33mm × 1.42mm (0.7mm max height), 15-bump wafer-level package (WLP). For a similar buck converter without a power MUX, refer to the MAX77596.

Design Solution: Pack More Power in Your Cool, Small Smart-Home Hub ›

Key Features

  • Wide Input Power Supply
    • 3V to 24V Supply Voltage
    • 500mA (max) Output Current
    • 1.8V, 3.3V, or 5.0V Factory-Set VOUT with Optional I2C Control: 1.5V to 7.5V in 50mV Steps
    • External Feedback Resistor VOUT Option (1V to 99% VSUP)
    • Hardware or Software Enable
  • Dual-Input Power MUX Replaces Common-Cathode Diode Arrays
    • Automatic Ideal-Diode ORing Voltage Selector
    • 250mΩ MOSFETs Minimize Power Consumption, BOM, and Solution Size
  • Low IQ Enables Always-On Rails
    • 1.5µA Quiescent Current (Only SUP Powered)
    • 19µA Quiescent Current (IN1/IN2 Powered)
    • 88% Peak Efficiency (12VSUP, 3.3VOUT)
  • Safe and Easy to Use
    • Short-Circuit and Thermal Protection
    • 8ms Soft-Start
    • Software-Enabled Spread Spectrum
    • Pin-Programmable Inductor Peak Current Level
  • Small Size
    • 2.33mm × 1.42mm (0.7mm max height) Wafer-Level Package (WLP)
    • 15-Bump, 0.4mm Pitch, 3 × 5 Array

Applications/Uses

  • Battery-Powered Systems, Backup Battery, Uninterruptible Rails
  • Home Automation, Low IQ Smart Hubs
  • Notebook and Tablet Computers
  • USB Type-C Power Delivery Accessories and Devices
Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 24
VOUT1 (V) (min) 1.5
VOUT1 (V) (max) 7.5
IOUT1 (A) (max) 0.5
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Digital/VID
Preset
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Design Tools EE-Sim
Package/Pins WLP/15
Budgetary
Price (See Notes)
$0.49 @1k
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Simplified Block Diagram

MAX77756: Simplified Block Diagram MAX77756: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX77756 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the MAX77756 synchronous 500mA step-down converter. The EV kit allows for easy evaluation of the IC’s input power multiplexer and step-down converter. A dual-range (8mA and 800mA full scale) electronic load is included on the EV kit for easy buck converter load control.

Windows®-based software provides a user-friendly graphical user interface (GUI), as well as a detailed register-based interface to exercise the features of the IC.

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Features

  • Easy to Use
    • Evaluates Both Fixed-Output and Adjustable- Output Versions (3.3V Version Preinstalled)
    • 3V to 24V Input Voltage Range
    • Demonstrates 1.5µA Quiescent Current at 12VSUP Input
  • GUI Drives I2C Interface
  • Emulates System Loading
    • On-Board Electronic Load
    • Electronic Load has Steady-State, Transient, and Random Modes
    • Optional Ability to Control Electronic Load through Function Generator for Patterned Load Waveforms
  • Proven PCB Layout
  • Fully Assembled and Tested

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Tools & Models

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Support & Training

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Parameters

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 24
VOUT1 (V) (min) 1.5
VOUT1 (V) (max) 7.5
IOUT1 (A) (max) 0.5
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Digital/VID
Preset
Synchronous Switching? Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Design Tools EE-Sim
Package/Pins WLP/15
Budgetary
Price (See Notes)
$0.49 @1k

Key Features

  • Wide Input Power Supply
    • 3V to 24V Supply Voltage
    • 500mA (max) Output Current
    • 1.8V, 3.3V, or 5.0V Factory-Set VOUT with Optional I2C Control: 1.5V to 7.5V in 50mV Steps
    • External Feedback Resistor VOUT Option (1V to 99% VSUP)
    • Hardware or Software Enable
  • Dual-Input Power MUX Replaces Common-Cathode Diode Arrays
    • Automatic Ideal-Diode ORing Voltage Selector
    • 250mΩ MOSFETs Minimize Power Consumption, BOM, and Solution Size
  • Low IQ Enables Always-On Rails
    • 1.5µA Quiescent Current (Only SUP Powered)
    • 19µA Quiescent Current (IN1/IN2 Powered)
    • 88% Peak Efficiency (12VSUP, 3.3VOUT)
  • Safe and Easy to Use
    • Short-Circuit and Thermal Protection
    • 8ms Soft-Start
    • Software-Enabled Spread Spectrum
    • Pin-Programmable Inductor Peak Current Level
  • Small Size
    • 2.33mm × 1.42mm (0.7mm max height) Wafer-Level Package (WLP)
    • 15-Bump, 0.4mm Pitch, 3 × 5 Array

Applications/Uses

  • Battery-Powered Systems, Backup Battery, Uninterruptible Rails
  • Home Automation, Low IQ Smart Hubs
  • Notebook and Tablet Computers
  • USB Type-C Power Delivery Accessories and Devices

Description

The MAX77756 is a synchronous 500mA step-down DC-DC converter with integrated dual-input power multiplexer (MUX). The converter operates on an input supply as low as 3.0V and as high as 24V. Default output voltage is factory-programmed to either 1.8V, 3.3V, or 5.0V. Output voltage is further adjustable through external resistors or an I2C serial interface.

The dual-input power MUX selects the higher voltage from two different input sources to power the step-down converter. Control circuitry ensures that only one channel of the MUX is on at a time to prevent cross-conduction between input sources. For single-input applications, the MUX can be bypassed and the step-down converter can be powered directly from the SUP pin.

The MAX77756 is available in a small 2.33mm × 1.42mm (0.7mm max height), 15-bump wafer-level package (WLP). For a similar buck converter without a power MUX, refer to the MAX77596.

Design Solution: Pack More Power in Your Cool, Small Smart-Home Hub ›

Simplified Block Diagram

MAX77756: Simplified Block Diagram MAX77756: Simplified 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