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14V Input, 1.5A High-Efficiency Buck Converter with 9μA IQ

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Product Details

The MAX77533 is a synchronous 1.5A step-down DC-DC converter optimized for portable 2-cell and 3-cell battery-operated and USB-C applications. The converter operates on an input supply between 3V and 14V. Output voltage is adjustable between 0.8V and 5V in 50mV steps through an I2C serial interface or 1.55V to 99% of the supply voltage with external feedback resistors. Factory-programmed default voltages of 1.2V, 1.8V, and 3.3V are offered to reduce component count for common rails. The device features a low-IQ SKIP mode which allows excellent efficiency at light loads.

Dedicated enable and power-OK (POK) pins allow simple hardware control. An I2C serial interface is optionally used for full configuration and control for dynamic voltage scaling and system power optimization.

Built-in undervoltage lockout (UVLO), output active discharge, cycle-by-cycle current limit, thermal shutdown, and short-circuit protection ensure safe operation under abnormal operating conditions.

The MAX77533 is available in a 12-bump, 0.4mm pitch wafer-level package (WLP).

Key Features

  • 1.5A Single Channel Buck Regulator
  • 3V to 14V Input Voltage Range
  • 0.8V to 99%VSUP Output Voltage Range
    • 0.8V to 5V I2C Programmable in 50mV Steps
    • 1.55V to 99%VSUP with External Feedback Resistors
    • 1.2V, 1.8V, or 3.3V Factory Preset Options
  • High-Efficiency, Low-IQ Extends Battery Life
    • 94% Peak Efficiency at 7.4VSUP, 3.3VOUT (2520 Inductor)
    • 9μA IQ (12VSUP, 1.8VOUT Internal Feedback Version)
    • Selectable Light-Load SKIP and Forced-PWM Modes
  • 1MHz or 550kHz Fixed-Frequency Switching
  • Hardware or Software Control
    • Enable Input and Power-OK Output Pins
    • Optional I2C Full Control Interface
  • Protection Features
    • Cycle-by-Cycle Inductor Peak Current Limit
    • Short-Circuit Hiccup Mode, UVLO, and Thermal Shutdown Protections
    • 1ms Default Soft-Start
  • Small Size
    • 1.85mm x 1.4mm (0.7mm max. height) WLP
    • 12-Bump, 0.4mm Pitch, 3 x 4 Array

Applications/Uses

  • 2-cell/3-cell High Power Density Supplies
  • Drones, HD Cameras, and Notebook Computers
  • Portable Li+/Li-ion Battery Powered Devices
  • Space-Constrained Portable Electronics
Parametric specs for Step-Down (Buck) Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 14
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 13.6
IOUT1 (A) (max) 1.5
Switch Type Internal
Preset VOUT (V) 3.3
Output Adjust. Method Preset, Resistor, I2C
Synchronous Switching Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Design Tools EE-Sim
Package/Pins WLP/12
Budgetary
Price (See Notes)
$0.42 @1k
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Simplified Block Diagram

MAX77533: Simplified Application Circuit MAX77533: Simplified Application Circuit Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX77533 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the MAX77533 synchronous step-down (buck) converter. The EV kit is a step-down voltage regulator circuit using MAX77533 that is capable of 3V to 14V input, 1.5A continuous load, and output voltage adjustable between 0.8V and 5V (internal feedback options) or 1.55V and 99% of the input voltage (external feedback option).

The EV kit features a dual-range electronic load that allows easy evaluation of loading use cases for the buck converter circuit. Steady-state, transient, or random load profiles can be programmed.

A USB-to-I2C translator circuit allows a Windows®-based PC to run a graphical user interface (GUI) for easy control of the MAX77533 registers as well as the on-board electronic load.

View Details

Features

  • Proven PCB Reference Design and Layout
  • Easy to Use
    • Simple Hardware Control: Jumpers and Test Points for EN, BIASEN, and POK
    • GUI Drives I2C Interface for Optional Software Control
    • Fully Assembled and Tested
  • USB to I2C Converter Allows for Easy Communication
    • Windows-Based Software GUI Controls Registers
    • Level Translator (MAX3395) Allows for Adjusting I2C Bus Voltage from 1.8V to 3.3V
  • On-Board Electronic Load Emulates System Loading
    • Steady-State, Transient, and Random Modes

Description

The MAX77533 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the MAX77533 synchronous step-down (buck) converter. The EV kit is a step-down voltage regulator circuit using MAX77533 that is capable of 3V to 14V input, 1.5A continuous load, and output voltage adjustable between 0.8V and 5V (internal feedback options) or 1.55V and 99% of the input voltage (external feedback option).

The EV kit features a dual-range electronic load that allows easy evaluation of loading use cases for the buck converter circuit. Steady-state, transient, or random load profiles can be programmed.

A USB-to-I2C translator circuit allows a Windows®-based PC to run a graphical user interface (GUI) for easy control of the MAX77533 registers as well as the on-board electronic load.

View Details

Features

  • Proven PCB Reference Design and Layout
  • Easy to Use
    • Simple Hardware Control: Jumpers and Test Points for EN, BIASEN, and POK
    • GUI Drives I2C Interface for Optional Software Control
    • Fully Assembled and Tested
  • USB to I2C Converter Allows for Easy Communication
    • Windows-Based Software GUI Controls Registers
    • Level Translator (MAX3395) Allows for Adjusting I2C Bus Voltage from 1.8V to 3.3V
  • On-Board Electronic Load Emulates System Loading
    • Steady-State, Transient, and Random Modes

Description

The MAX77533 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the MAX77533 synchronous step-down (buck) converter. The EV kit is a step-down voltage regulator circuit using MAX77533 that is capable of 3V to 14V input, 1.5A continuous load, and output voltage adjustable between 0.8V and 5V (internal feedback options) or 1.55V and 99% of the input voltage (external feedback option).

The EV kit features a dual-range electronic load that allows easy evaluation of loading use cases for the buck converter circuit. Steady-state, transient, or random load profiles can be programmed.

A USB-to-I2C translator circuit allows a Windows®-based PC to run a graphical user interface (GUI) for easy control of the MAX77533 registers as well as the on-board electronic load.

View Details

Features

  • Proven PCB Reference Design and Layout
  • Easy to Use
    • Simple Hardware Control: Jumpers and Test Points for EN, BIASEN, and POK
    • GUI Drives I2C Interface for Optional Software Control
    • Fully Assembled and Tested
  • USB to I2C Converter Allows for Easy Communication
    • Windows-Based Software GUI Controls Registers
    • Level Translator (MAX3395) Allows for Adjusting I2C Bus Voltage from 1.8V to 3.3V
  • On-Board Electronic Load Emulates System Loading
    • Steady-State, Transient, and Random Modes

Description

The MAX77533 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the MAX77533 synchronous step-down (buck) converter. The EV kit is a step-down voltage regulator circuit using MAX77533 that is capable of 3V to 14V input, 1.5A continuous load, and output voltage adjustable between 0.8V and 5V (internal feedback options) or 1.55V and 99% of the input voltage (external feedback option).

The EV kit features a dual-range electronic load that allows easy evaluation of loading use cases for the buck converter circuit. Steady-state, transient, or random load profiles can be programmed.

A USB-to-I2C translator circuit allows a Windows®-based PC to run a graphical user interface (GUI) for easy control of the MAX77533 registers as well as the on-board electronic load.

View Details

Features

  • Proven PCB Reference Design and Layout
  • Easy to Use
    • Simple Hardware Control: Jumpers and Test Points for EN, BIASEN, and POK
    • GUI Drives I2C Interface for Optional Software Control
    • Fully Assembled and Tested
  • USB to I2C Converter Allows for Easy Communication
    • Windows-Based Software GUI Controls Registers
    • Level Translator (MAX3395) Allows for Adjusting I2C Bus Voltage from 1.8V to 3.3V
  • On-Board Electronic Load Emulates System Loading
    • Steady-State, Transient, and Random Modes

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Tools & Models

EE-Sim: Design & Simulate MAX77533

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Parameters

Parametric specs for Step-Down (Buck) Switching Regulators
VIN (V) (min) 3
VIN (V) (max) 14
VOUT1 (V) (min) 0.8
VOUT1 (V) (max) 13.6
IOUT1 (A) (max) 1.5
Switch Type Internal
Preset VOUT (V) 3.3
Output Adjust. Method Preset, Resistor, I2C
Synchronous Switching Yes
Power Good Signal Yes
# DC-DC Outputs 1
Switching Frequency (kHz) 1000
Design Tools EE-Sim
Package/Pins WLP/12
Budgetary
Price (See Notes)
$0.42 @1k

Key Features

  • 1.5A Single Channel Buck Regulator
  • 3V to 14V Input Voltage Range
  • 0.8V to 99%VSUP Output Voltage Range
    • 0.8V to 5V I2C Programmable in 50mV Steps
    • 1.55V to 99%VSUP with External Feedback Resistors
    • 1.2V, 1.8V, or 3.3V Factory Preset Options
  • High-Efficiency, Low-IQ Extends Battery Life
    • 94% Peak Efficiency at 7.4VSUP, 3.3VOUT (2520 Inductor)
    • 9μA IQ (12VSUP, 1.8VOUT Internal Feedback Version)
    • Selectable Light-Load SKIP and Forced-PWM Modes
  • 1MHz or 550kHz Fixed-Frequency Switching
  • Hardware or Software Control
    • Enable Input and Power-OK Output Pins
    • Optional I2C Full Control Interface
  • Protection Features
    • Cycle-by-Cycle Inductor Peak Current Limit
    • Short-Circuit Hiccup Mode, UVLO, and Thermal Shutdown Protections
    • 1ms Default Soft-Start
  • Small Size
    • 1.85mm x 1.4mm (0.7mm max. height) WLP
    • 12-Bump, 0.4mm Pitch, 3 x 4 Array

Applications/Uses

  • 2-cell/3-cell High Power Density Supplies
  • Drones, HD Cameras, and Notebook Computers
  • Portable Li+/Li-ion Battery Powered Devices
  • Space-Constrained Portable Electronics

Description

The MAX77533 is a synchronous 1.5A step-down DC-DC converter optimized for portable 2-cell and 3-cell battery-operated and USB-C applications. The converter operates on an input supply between 3V and 14V. Output voltage is adjustable between 0.8V and 5V in 50mV steps through an I2C serial interface or 1.55V to 99% of the supply voltage with external feedback resistors. Factory-programmed default voltages of 1.2V, 1.8V, and 3.3V are offered to reduce component count for common rails. The device features a low-IQ SKIP mode which allows excellent efficiency at light loads.

Dedicated enable and power-OK (POK) pins allow simple hardware control. An I2C serial interface is optionally used for full configuration and control for dynamic voltage scaling and system power optimization.

Built-in undervoltage lockout (UVLO), output active discharge, cycle-by-cycle current limit, thermal shutdown, and short-circuit protection ensure safe operation under abnormal operating conditions.

The MAX77533 is available in a 12-bump, 0.4mm pitch wafer-level package (WLP).

Simplified Block Diagram

MAX77533: Simplified Application Circuit MAX77533: Simplified Application Circuit 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.