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
| Charging VIN (V) (max) | 7.5 |
| Max. ICHG (A) | 1.55 |
| Cell Chemistry | Li-Ion Li-Polymer |
| # Lithium Ion Cells | 1 |
| Protected VIN (V) (max) | 22 |
| Charger (V) | 4.1 4.15 4.2 4.35 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | WLP/20 |
| Budgetary Price (See Notes) | 1.52 |
Simplified Block Diagram
Technical Docs
| Data Sheet | Industry's Smallest 1.55A 1-Cell Li+ DC-DC Charger | Jun 24, 2022 |
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 .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
Parameters
| Charging VIN (V) (max) | 7.5 |
| Max. ICHG (A) | 1.55 |
| Cell Chemistry | Li-Ion Li-Polymer |
| # Lithium Ion Cells | 1 |
| Protected VIN (V) (max) | 22 |
| Charger (V) | 4.1 4.15 4.2 4.35 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | WLP/20 |
| Budgetary Price (See Notes) | 1.52 |
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 (MAX8971EWP+ and MAX8971GEWP+)
- 4.35V, 4.40V, 4.45V, 4.50V (MAX8971BEWP+)
- 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
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 | Jun 24, 2022 |
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 .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact [email protected] with any questions regarding this Sample Site.
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