MAX77840
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MAX77840

3A Buck Charger with ModelGauge m5 Fuel Gauge and USB BC1.2 Detection

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Fully Integrated, Single Chip Battery Management Solution for 1-Cell USB Applications

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.17
Features
  • Single-Input Switch Mode Charger
  • Up to 16V Protection
    • Up to 13.4V Input Operating Range
    • Up to 4.0A Input Current Limit with Adaptive Input Current Limiting (AICL)
    • Up to 3.15A Battery Charging Current Limit
    • CC, CV, and Die Temperature Control
    • Small Inductor: 0.47µH or 1µH Package
    • High Efficiency
  • Supports USB-OTG Reverse Boost, up to 1.5A Current Limit (Programmable)
  • Integrated Battery True-Disconnect FET
    • RDS(ON) = 12.8mΩ
    • Rated Up to 9ARMS, Discharge Current Limit (Programmable, Default 4.5A)
  • Adapter Type Detection
    • D+/D- Detection for USB port, USB DCP, and USB HVDCP
    • BC 1.2 Compliant
  • ModelGauge m5 Battery Fuel Gauge
    • ±1% SOC Accuracy, No Calibration Cycles, Very Low IQ
    • Time-to-Empty and Time-to-Full Prediction
  • One Safeout LDO
  • Control Functions
    • Shipping Mode with ONKEY Pressing Clear
    • True Hardware Reset with ONKEY
  • I2C 3.0 Compatible Interface with Interrupt Output
  • 3.87mm x 3.96mm, 9 x 9 Array WLP with 0.4mm Pitch
Additional Details
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The MAX77840 is a 3.15A switched-mode charger and ModelGauge™ fuel gauge with integrated USB BC1.2 detection for Li-ion batteries and a SAFEOUT LDO.

The charger integrates all switches and operates at either 4MHz or 2MHz (programmable) switching frequency, allowing selection of the smallest external components or achieving lowest heat dissipation. The MAX77840 is ideally suited for devices such as mobile point-of-sale devices, portable medical electronics, or other handheld devices. It includes the USB BC1.2 detection function to recognize common USB adapters and set the input current limit automatically. The MAX77840 can supply up to 1.5A OTG current with proprietary MAXOTG protection, that limits the OTG output current to prevent system voltage from collapsing under heavy OTG loads.

The ModelGauge m5 provides accurate battery fuel gauging and operates with extremely low battery current (25µA, typ) during standby or sleep mode to extend battery life. The interaction between the ModelGauge m5 and the charger provides end users a superior charging experience in a single IC.

Shipping mode is built into the MAX77840 to minimize battery drain when the device is not in use. The MAX77840 features an I2C 3.0 compatible serial interface. It is offered in a 3.87mm x 3.96mm, 9 x 9 bump array wafer-level package (WLP) with 0.4mm pitch.

Applications

  • Industrial PCs
  • Portable Medical Devices
  • Mobile Point-of-Sale Devices
  • Wireless Speakers
  • E-Cigarettes
  • Smart Home Automation, Sensors
  • Internet of Things (IoT)
Part Models 2
1ku List Price Starting From $2.17

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Documentation

Documentation

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Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Jan 5, 2022

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX77840EVKIT

Evaluation Kit for the MAX77840

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MAX77840EVKIT

Evaluation Kit for the MAX77840

Evaluation Kit for the MAX77840

Features and Benefits

  • MAX77840 EV kit Includes all Necessary Components for Device Operation in Addition to many Components for added Flexibility and Easy to Use
  • Easy-to-Use Push-Button Interface for On-Off Control
  • 0Ω Resistors in Series with Several Key Nodes to be able to Isolate them and for Added Flexibility
  • Assembled and Tested
  • Test Points Allow Convenient Access to Nodes of Interest
  • Jumper Headers Acting as both Test Points and Shunts

Product Detail

The MAX77840 evaluation kit (EV kit) consists of a board and the Maxim MINIQUSB with an extender board command module.

The MAX77840 includes a single input, 3.15A switch mode charger with reverse boost capability for one-cell Lithium-Ion (Li+) battery; USB BC1.2 adapter type detection with proprietary ModelGauge fuel-gauging technology, and a Safeout LDO.

The EV kit comes standard with the MAX77840 installed. MiniQUSB board with an extender board should be used that allows a PC to use a USB port to emulate an I2C 2-wire interface. This Windows® based graphical user interface (GUI) software is available for use with the EV kit and can be downloaded from the MAX77840 product webpage at www.maximintegrated.com. Windows 7 or newer operating system is required to use the EV kit GUI software.

Applications

  • E-Cigarettes
  • Industrial PCs
  • Internet of Things (IoT)
  • Mobile Point-of-Sale Devices
  • Portable Medical Devices
  • Smart Home Automation, Sensors
  • Wireless Speakers
Reference Designs

Reference Designs 1

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