The MAX8971EWP+ is a compact, high-frequency, high-efficiency switch-mode charger for a one-cell lithium-ion (Li+) battery. It delivers up to 1.55A of current to the battery from inputs up to 7.5V and withstands transient inputs up to 22V. The 4MHz switch-mode charger is ideally suited for small portable devices, such as Bluetooth headsets, AR/VR glasses, and other lithium-ion powered accessories. It minimizes component size and heat. Battery-protection features include: low-voltage prequalification, charge fault timer, die temperature monitoring, and battery temperature monitoring. The battery temperature monitoring adjusts the charge current and termination voltage for safe use of secondary lithium-ion batteries. The IC accepts either a general DC input or USB. It has programmable automatic input-current limiting to protect upstream charging sources such as USB. Charge parameters are easily adjustable through an I2C interface. Charge is terminated based on user-selectable minimum current level. Charge status is provided to the application processor through an interrupt pin. The IC is available in a space-saving, 20-bump, 2.18mm x 1.62mm WLP package.
Feature
- Switch-Mode Charger
- High-Efficiency
- Low Heat
- Fast Charge Time
- Small and Simple
- Precise
- Up to ±5% Current Regulation and 0.5% Voltage Regulation
- Safe
- JEITA Battery Temperature Monitor
- Over/Undervoltage Protection, Safety Timers, Temperature Regulation
- USB Friendly
- Flexible
- Programmable Voltage/Current
- Status/Interrupts Through I2C
- Automatic Input Current Limit
- I2C Interface
- Input Current Limit (100mA to 1500mA)
- Fast-Charge/Termination Current (250mA to 1550mA)
- Charge Voltage (4.1V, 4.15V, 4.2V, 4.35V)
- Termination Enable
- +22V Absolute Maximum Input Voltage Rating
- Up to 7.5V Maximum Operating Input Voltage
- 5V USB/Safeout LDO for USB PHY
- 2.3A GSM RF Test Mode (Factory Testing)
- Charge Current to Voltage Conversion (VICHG) for Baseband ADC
- Reverse Battery Leakage Protection
- Input/Output Overvoltage Protection
- Interrupt Status Output
Applications
- AR/VR Glasses
- Bluetooth Headsets
- Hearables
- Portable Devices
- Smartphones
- USB Charging
- Wearables
