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

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)

* 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