/
/
/
Battery Management 
/
Top ![]()
MAX8971
Industry's Smallest 1.55A 1-Cell Li+ DC-DC Charger
Switching Charger Delivers High Efficiency (90%~92%)
MyMaxim SubscriptionsProduct Details
Key Features
Applications/Uses
Parametric specs for Battery Chargers
| Package/Pins | WLP/20 |
| Budgetary Price (See Notes) | 1.25 |
View Less
Simplified Block Diagram
Technical Docs
| Data Sheet | Industry's Smallest 1.55A 1-Cell Li+ DC-DC Charger | Sep 13, 2018 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
Parametric specs for Battery Chargers
| Package/Pins | WLP/20 |
| Budgetary Price (See Notes) | 1.25 |
Key Features
- 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/Uses
- AR/VR Glasses
- Bluetooth Headsets
- Hearables
- Portable Devices
- Smartphones
- USB Charging
- Wearables
Description
The MAX8971 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.
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.
Technical Docs
| Data Sheet | Industry's Smallest 1.55A 1-Cell Li+ DC-DC Charger | Sep 13, 2018 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Request a Quote