Features and Benefits
- Enables Charging from a USB Port
- Automatic Detection of Adapter Type
- Input Current Up to 1500mA and Charging Current Up to 900mA
- Enumeration Without Processor Intervention
- Supports USB Low-Speed and Full-Speed
- Compliant with USB 2.0 Specification and Battery Charging Specification (Revision 1.1)
- Compliant with Next Generation Low-Voltage Li-Ion Battery Profiles
- Input Overvoltage Protection Up to 16V
- Smart Power Selector Allows Power Path Operation with Discharged or No Battery
- Battery Detection Including Packs with Open Protectors
- Thermal Regulation Prevents Overheating
- LED Indicator for Charge Done, Precharge, and Time/Temperature Error
- Serial (400kHz) I²C-Compatible Interface
- 6µA (typ) Shutdown Current
- 2.44mm x 2.44mm, 25-Bump WLP Package
The MAX77301 is a JEITA-compliant* lithium-ion linear battery charger that operates from a USB port, a dedicated charger, or universal adapter. The IC provides automatic adapter-type detection and enumeration with a USB host or hub. The IC integrates independent battery charge switch, current sense circuit, MOSFET pass elements, thermal regulation circuitry, and eliminates the external reverse-blocking Schottky diode to create the simplest and smallest USB-compliant charging solution.
The IC includes automated detection of charge adapter type, making it possible to distinguish USB 2.0 device, USB charger, dedicated charger devices as well as standard input adapters. See Table 2 in the full data sheet. When enumeration is enabled, the IC automatically negotiates with a USB host, making it possible to achieve the highest-charging current available from a USB 2.0 device or USB charger without processor intervention. The adapter type detection is compliant with USB 2.0 as well as battery charging Specification Revision 1.1.
The IC controls the charging sequence for single-cell Li+ batteries from battery detection, prequalification, fast charge, top-off, and charge termination. Charging is controlled using constant current, constant voltage and constant die-temperature (CCCVCTj) regulation for safe operation under all conditions. The IC is also compliant with JEITA battery charging requirements.
The Smart Power Selector™ feature makes the best use of limited USB or adapter power. Battery charge current is set independent of the input current limit. Power not used by the system charges the battery. The battery assists the input source when needed. System voltage is maintained by allowing the application to operate without a battery, a discharged battery, or a dead battery. Automatic input selection switches the system from battery to external power.
The I²C interface provides full programmability of battery charge characteristics, input current limit, and protection features. This provides flexibility for use with a wide range of adapter and battery sizes.
Other features include undervoltage lockout (UVLO), overvoltage protection (OVP), charge status flag, charge fault flag, input power-OK monitor, battery detection, JEITA-compliant charging, charge timer, 3.3V/10mA auxiliary output, and an external power-on switch.
- Bluetooth Headsets, PDAs, and MP3 Players
- Other Portable Devices
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The MAX77301 evaluation kit (EV kit) is a fully assembled and tested PCB for evaluating the MAX77301 dual-path lithium-ion (Li+) battery charger with USB enumeration and automatic adapter-type detection features. The EV kit is powered from a USB port or dedicated charger with automatic detection of adapter type and USB enumeration capability.
The IC features a Smart Power Selector™ feature that makes the best use of limited USB or adapter power. Battery charge current is set independent of the inputcurrent limit. Power not used by the system charges the battery. This allows the application to operate without a battery, discharged battery, or dead battery. Automatic input selection switches the system between battery, battery assist, and external power modes.
The EV kit provides LED indicators for adapter-type detection (active-low UOK), external power-on (active-low EXT_PWRON), charging status (active-low CHG_STAT), external power-source current capability (CHG_TYPE), and interrupts (active-low IRQ). The EV kit also features an NTC thermistor for thermal protection and JEITA-compliant* charging.
The EV kit is configured for full-speed USB by default, but can be configured for low-speed USB by removing the crystal oscillator and adjusting jumper default settings.
- Bluetooth Headsets, PDAs, and MP3 Players
- Other Portable Devices
Features & Benefits
- Enables Charging from a Micro-B USB Connector
- USB Enumeration without Host-Processor Intervention
- Automatic Detection of Adapter Type or USB Port
- Dual-Speed USB Operation (Full Speed or Low Speed)
- Input Overvoltage Protection to 16V
- Smart Power Selector
- Automatic Current Sharing Between Battery Charging and System
- Operates with Discharged or No Battery
- LED Indicators
- NTC Monitoring of Battery Temperature
- JEITA-Compliant Charging Profile
- Thermal-Charge Regulation Prevents the IC from Overheating
Documentation & Resources
The Basics of USB Battery Charging12/9/2010
Tools & Simulations
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.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.