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Analog Devices / Maxim Integrated MAX77785/MAX77786 1-Cell Li+ Battery Chargers

Analog Devices MAX77785/MAX77786 1-Cell Li+ Battery Chargers are high-performance high input 3.5/5.5A fast chargers implementing the Smart Power Selector™. The MAX77785/MAX77786 can operate as a reverse boost converter without an additional inductor, letting the battery share its power through the charging port and offering programmable output voltage from 4.505V to 10.805V. The devices feature fully integrated low-loss power switches to deliver a small solution size and high efficiency, even at high input voltage and charging current. The high switching frequency facilitates the use of a smaller-sized inductor. The ICs feature true load disconnection in reverse boost mode and have an adjustable output current protection limit. The chargers are highly flexible and programmable through an I2C configuration. The MAX77785/MAX77786 supports Li-ion, Li-polymer, and LiFePO4 battery chemistries. It can also provide fast programmable unplug detection of sources for dynamic system load management.

To support a variety of legacy USBs as well as proprietary adapters, the ADI MAX77785/MAX77786 also integrates BC1.2 detection using the D+ and D- pins. The battery charger includes a Smart Power Selector for various battery sizes and system loads. The Smart Power Selector permits the system to start up gracefully when an input source is available, even when the battery is deeply discharged (dead battery) or missing. The device can be configured so that the battery charging can automatically start when power is applied to the charger input.

Features

  • High-efficiency single-cell switching charger
    • Up to 5.5A charging with MAX77786
    • Up to 3.5A charging with MAX77785
    • 90% buck efficiency at 4A, 15V input
    • Up to 5.5A input current limit with AICL (MAX77786)
    • Up to 3.5A input current limit with AICL (MAX77785)
  • Reverse boost with programmable output voltage options up to 10.805V
    • Up to 16.2W for MAX77786
    • Up to 10.8W for MAX77785
    • Dedicated Boost enable input
  • Integrated battery true-disconnect FET
    • RDSON=7.7mΩ
    • Programmable discharge current limit up to 10A
    • Shipping mode and low battery leakage current
    • 1.3MHz switching frequency with 1µH inductor
    • Disconnect input (DISQBAT)
  • +26V absolute maximum input voltage rating
  • 4.7V to 18.2V input operating voltage range
  • Safety
    • Battery temperature sensing and charge safety timer
    • JEITA Guideline Compliant
    • Thermal regulation and thermal shutdown
    • System voltage OVLO/UVLO
  • USB switch with BC1.2 detection
  • Spread spectrum for noise-sensitive applications
  • Charge status output for LED
  • Push-button input for exiting from ship mode
  • Programmable unplug detection output
  • Dedicated input for Suspend Mode (SUSPND)
  • I2C interface
  • 2.96mm x 2.96mm WLP

Applications

  • Gaming devices
  • VR applications
  • mPOS
  • Tablet PCs

Associated Kits

Analog Devices / Maxim Integrated MAX77785EVKIT/MAX77786EVKIT Evaluation Kits

Fully assembled & tested PCB that features the MAX77785/86 1-cell lithium-ion battery chargers.

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Simplified Block Diagram

Block Diagram - Analog Devices / Maxim Integrated MAX77785/MAX77786 1-Cell Li+ Battery Chargers
Inilathala: 2024-04-16 | Na-update: 2024-05-14