MAX77840

PRODUCTION

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

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.17

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Overview

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
- R_DS(ON) = 12.8mΩ
- Rated Up to 9A_RMS, 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 I_Q
- 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

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

Documentation

Data Sheet 1

MAX77840: 3A Buck Charger with ModelGauge m5 Fuel Gauge and USB BC1.2 Detection Data Sheet (Rev.0) 08/25/2021

Technical Articles 1

Enabling Automation in Logistics and Retail - Part 1 07/09/2024

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX77840EWG+	81-WLCSP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX77840EWG+T	81-WLCSP-N/A	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jan 5, 2022 - 2228 TEST
		pcn_2228
MAX77840EWG+	PRODUCTION
MAX77840EWG+T	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

Software Development 1

MAX77840 Evaluation Kit Software, 1.1.14

Evaluation Kits

Evaluation Kit for the MAX77840

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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 Details

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