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19VIN, 3.5/5.5A 1-Cell Li+ Battery Charger with Smart Power Selector and OTG for USBC PD

Industry's Highest-Efficiency Buck Charger for USB Type-C Power Delivery Applications

Product Details

The MAX77975/MAX77976 is a high-performance high-input 3.5/5.5A fast charger with Smart Power SelectorTM. The IC can operate as a reverse boost without an additional inductor, allowing the battery to share its power through the charging port and is voltage programmable from 5V to 12V. The device features fully integrated low-loss power switches to provide small solution size and high-efficiency, even at high input voltage and high charging current. Its high switching frequency allows the use of a smaller sized inductor. The IC features true load disconnection in reverse boost mode and has an adjustable output current protection limit. The device is highly flexible and programmable through I2C configuration.

The battery charger includes a Smart Power Selector to accommodate a wide range of battery sizes and system loads. The Smart Power Selector allows the system to start-up gracefully as soon as an input source is available, even when the battery is deeply discharged (dead battery) or missing. It can be configured so that when power is applied to the charger input, the battery charging can automatically start.

Key Features

  • High-Efficiency Single-Cell Switching Charger
    • Up to 5.5A Charging with MAX77976
    • 91.2% Buck Efficiency at 4A, 12V Input
    • 90.5% Charging Efficiency at 3.5A, 9V Input
    • Optimized for High Voltage Input Operation
    • Accelerate Charge Time by Monitoring Kelvin Sensing Battery Voltage
    • Up to 3.2A Input Current Limit with AICL
  • +28V Absolute Maximum Input Voltage Rating
  • 3.8V to 19V Input Operating Voltage Range
  • Reverse Boost with Programmable Output Voltage Options up to 12V
    • Up to 18W for MAX77976
    • Up to 12W for MAX77975
  • Integrated Battery True-Disconnect FET
    • RDSON = 7.7
    • Programmable Discharge Current Limit up to 10A
    • Support Shipping Mode and Low Battery Leakage Current
    • 1.3MHz/2.6MHz Switching Frequency with 1μH/0.47μH Inductor
    • Disconnect Input (DISQBAT)
  • Safety
    • Battery Temperature Sensing and Charge Safety Timer
    • JEITA Guideline Compliant
    • Thermal Regulation and Thermal Shutdown
    • System Voltage OVLO/UVLO
  • Charge Status Output for LED
  • Push-Button Input for Exiting from Ship Mode
  • External Discharge FET Enable Output
  • Dedicated Input for Suspend Mode (SUSPND)
  • I2C Interface
  • 4mm x 4mm FC2QFN

Applications/Uses

  • Gaming Devices
  • VR Applications
  • mPOS
  • Tablet PCs
Parametric specs for Battery Chargers
Charging VIN (V) (max) 19
Max. ICHG (A) 5.5
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 28
Charger (V) 4.15 to 4.46
Oper. Temp. (°C) -40 to +85
Package/Pins FC2QFN/23
Budgetary
Price (See Notes)
$1.58 @1k
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Simplified Block Diagram

MAX77975, MAX77976: Simplified Block Diagram MAX77975, MAX77976: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

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

Description

The MAX77975/MAX77976 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77975/MAX77976 single-cell lithium-ion battery charger.

The MAX77975/MAX77976 is for 1S Li+ battery applications and can operate with a 3.8V to 19V input voltage with a maximum charging current of 3.5/5.5A. The MAX77975/MAX77976 offers a reverse boost as well as fully integrated low power loss switches to provide small solution size and high efficiency. The EV kit demonstrates the performance of the MAX77975/MAX77976 charger and provides the convenience of evaluating full USB Type-C® PD solutions with the MAX77958 USB Type-C PD controller. This combination allows fast charging of the battery through the USB Type-C port as well as reverse powering the USB Type-C port with battery OTG mode.

A Micro-B USB cable is included in the package to serve as the interface from a USB port on a Windows PC to the slave I2C port on MAX77975/MAX77976. Windows®- based graphical user interface (GUI) software provides a user-friendly interface to exercise the features of the MAX77975/MAX77976.

View Details

Features

  • High-Efficiency Single-Cell Switching Charger
    • Up to 5.5A Charging with MAX77976
    • 91.2% Buck Efficiency at 4A, 12V Input
  • +28V Absolute Maximum Input Voltage Rating
  • 3.8V to 19V Input Operating Voltage Range
  • Reverse Boost with Programmable Output Voltage Options Up to 12V
  • Charge Status Output for LED
  • Push-Button Input for Exiting from Ship Mode
  • External Discharge FET Enable Output
  • Dedicated Input for Suspend Mode (SUSPND)
  • USB Type-C Standalone Controller Support Customizable Firmware
  • USB Type-C Version 1.3 and PD 3.0 Compliant
  • Sink/Source/DRP Port Support
  • PPS Sink Support
  • Fast Role Swap Initial Sink Support
  • Integrated VCONN Switch with OCP
  • Support Try.Sink
  • Support BC1.2 Legacy Charger Detection

Description

The MAX77975/MAX77976 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77975/MAX77976 single-cell lithium-ion battery charger.

The MAX77975/MAX77976 is for 1S Li+ battery applications and can operate with a 3.8V to 19V input voltage with a maximum charging current of 3.5/5.5A. The MAX77975/MAX77976 offers a reverse boost as well as fully integrated low power loss switches to provide small solution size and high efficiency. The EV kit demonstrates the performance of the MAX77975/MAX77976 charger and provides the convenience of evaluating full USB Type-C® PD solutions with the MAX77958 USB Type-C PD controller. This combination allows fast charging of the battery through the USB Type-C port as well as reverse powering the USB Type-C port with battery OTG mode.

A Micro-B USB cable is included in the package to serve as the interface from a USB port on a Windows PC to the slave I2C port on MAX77975/MAX77976. Windows®- based graphical user interface (GUI) software provides a user-friendly interface to exercise the features of the MAX77975/MAX77976.

View Details

Features

  • High-Efficiency Single-Cell Switching Charger
    • Up to 5.5A Charging with MAX77976
    • 91.2% Buck Efficiency at 4A, 12V Input
  • +28V Absolute Maximum Input Voltage Rating
  • 3.8V to 19V Input Operating Voltage Range
  • Reverse Boost with Programmable Output Voltage Options Up to 12V
  • Charge Status Output for LED
  • Push-Button Input for Exiting from Ship Mode
  • External Discharge FET Enable Output
  • Dedicated Input for Suspend Mode (SUSPND)
  • USB Type-C Standalone Controller Support Customizable Firmware
  • USB Type-C Version 1.3 and PD 3.0 Compliant
  • Sink/Source/DRP Port Support
  • PPS Sink Support
  • Fast Role Swap Initial Sink Support
  • Integrated VCONN Switch with OCP
  • Support Try.Sink
  • Support BC1.2 Legacy Charger Detection

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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

Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 19
Max. ICHG (A) 5.5
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 28
Charger (V) 4.15 to 4.46
Oper. Temp. (°C) -40 to +85
Package/Pins FC2QFN/23
Budgetary
Price (See Notes)
$1.58 @1k

Key Features

  • High-Efficiency Single-Cell Switching Charger
    • Up to 5.5A Charging with MAX77976
    • 91.2% Buck Efficiency at 4A, 12V Input
    • 90.5% Charging Efficiency at 3.5A, 9V Input
    • Optimized for High Voltage Input Operation
    • Accelerate Charge Time by Monitoring Kelvin Sensing Battery Voltage
    • Up to 3.2A Input Current Limit with AICL
  • +28V Absolute Maximum Input Voltage Rating
  • 3.8V to 19V Input Operating Voltage Range
  • Reverse Boost with Programmable Output Voltage Options up to 12V
    • Up to 18W for MAX77976
    • Up to 12W for MAX77975
  • Integrated Battery True-Disconnect FET
    • RDSON = 7.7
    • Programmable Discharge Current Limit up to 10A
    • Support Shipping Mode and Low Battery Leakage Current
    • 1.3MHz/2.6MHz Switching Frequency with 1μH/0.47μH Inductor
    • Disconnect Input (DISQBAT)
  • Safety
    • Battery Temperature Sensing and Charge Safety Timer
    • JEITA Guideline Compliant
    • Thermal Regulation and Thermal Shutdown
    • System Voltage OVLO/UVLO
  • Charge Status Output for LED
  • Push-Button Input for Exiting from Ship Mode
  • External Discharge FET Enable Output
  • Dedicated Input for Suspend Mode (SUSPND)
  • I2C Interface
  • 4mm x 4mm FC2QFN

Applications/Uses

  • Gaming Devices
  • VR Applications
  • mPOS
  • Tablet PCs

Description

The MAX77975/MAX77976 is a high-performance high-input 3.5/5.5A fast charger with Smart Power SelectorTM. The IC can operate as a reverse boost without an additional inductor, allowing the battery to share its power through the charging port and is voltage programmable from 5V to 12V. The device features fully integrated low-loss power switches to provide small solution size and high-efficiency, even at high input voltage and high charging current. Its high switching frequency allows the use of a smaller sized inductor. The IC features true load disconnection in reverse boost mode and has an adjustable output current protection limit. The device is highly flexible and programmable through I2C configuration.

The battery charger includes a Smart Power Selector to accommodate a wide range of battery sizes and system loads. The Smart Power Selector allows the system to start-up gracefully as soon as an input source is available, even when the battery is deeply discharged (dead battery) or missing. It can be configured so that when power is applied to the charger input, the battery charging can automatically start.

Simplified Block Diagram

MAX77975, MAX77976: Simplified Block Diagram MAX77975, MAX77976: 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