MAX77301

PRODUCTION

MAX77301

JEITA-Compliant, Li+ Charger with Smart Power Selector, Automatic Detection, and USB Enumeration

Safe and Quick Charging, Adapter Type Detection, and Maximum Charge Current Enumeration

PRODUCTION

MAX77301: Simplified Operating Circuit slide

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Features

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

Additional Details

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.

Applications

Bluetooth Headsets, PDAs, and MP3 Players
Other Portable Devices

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

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Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

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Part Models 2

1ku List Price

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Technical Documents 2

MAX77301: JEITA-Compliant, Li+ Charger with Smart Power Selector, Automatic Detection, and USB Enumeration Data Sheet (Rev.1) 07/15/2021

MAX77301 Reliability Data 01/12/2023

Design Resources 2

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX77301EWA+	Wafer-Level Package 5x5 Bump, Full Array	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
MAX77301EWA+T	Wafer-Level Package 5x5 Bump, Full Array	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

MAX77301EWA+
Pin/Package Drawing
Wafer-Level Package 5x5 Bump, Full Array
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

MAX77301EWA+T
Pin/Package Drawing
Wafer-Level Package 5x5 Bump, Full Array
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Companion Parts 4

Parts	Product Life Cycle	Description
Linear Battery Chargers3
MAX8895V	PRODUCTION	Li-Ion Chargers with Smart Power Selector, Adapter Type Detection, and USB Enumeration
MAX8895W	PRODUCTION	Li-Ion Chargers with Smart Power Selector, Adapter Type Detection, and USB Enumeration
MAX8895X	PRODUCTION	Li-Ion Chargers with Smart Power Selector, Adapter Type Detection, and USB Enumeration
Product1
MAX8895Y	Obsolete	Li-Ion Chargers with Smart Power Selector, Adapter Type Detection, and USB Enumeration

MAX77301EVKIT

Evaluation Kit for the MAX77301/MAX77301A

MAX77301EVKIT

Evaluation Kit for the MAX77301/MAX77301A

Features and 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

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Product Detail

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.

Applications