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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

Key Features

Applications/Uses

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
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Simplified Block Diagram

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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

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 .