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DATA SHEET
MAX77301
JEITA-Compliant, Li+ Charger with Smart Power
Selector, Automatic Detection, and USB Enumeration
General Description
Benefits and Features
S Enables Charging from a USB Port
S Automatic Detection of Adapter Type
The MAX77301 is a JEITA-compliant* lithium-ion linear
battery charger that operates from a USB port, a dedi-
cated charger, or universal adapter. The IC provides
automatic adapter-type detection and enumeration with
a USB host or hub. The IC integrates independent bat-
tery 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.
S Input Current Up to 1500mA and Charging Current
Up to 900mA
S Enumeration Without Processor Intervention
S Supports USB Low-Speed and Full-Speed
S Compliant with USB 2.0 Specification and Battery
Charging Specification (Revision 1.1)
S Compliant with Next Generation Low-Voltage
Li-Ion Battery Profiles
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. 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 detec-
tion is compliant with USB 2.0 as well as battery charging
Specification Revision 1.1.
S Input Overvoltage Protection Up to 16V
S Smart Power Selector™ Allows Power Path
Operation with Discharged or No Battery
S Battery Detection Including Packs with Open
Protectors
S Thermal Regulation Prevents Overheating
S LED Indicator for Charge Done, Precharge, and
Time/Temperature Error
S Serial (400kHz) I2C-Compatible Interface
S 6µA (typ) Shutdown Current
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.
S 2.44mm x 2.44mm, 25-Bump WLP Package
Applications
Bluetooth Headsets, PDAs, and MP3 Players
Other Portable Devices
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 with-
out a battery, a discharged battery, or a dead battery.
Automatic input selection switches the system from bat-
tery to external power.
The I2C interface provides full programmability of battery
charge characteristics, input current limit, and protec-
tion features. This provides flexibility for use with a wide
range of adapter and battery sizes.
Simplified Operating Circuit
4.0V TO 6.6V
(+16V OVP)
BUS
SYS
V
BUS
SYSTEM
LOAD
2
I C
CHARGE AND
CONTROL
LOGIC
SYS LOAD
SWITCH
D+
D-
USB
INTERFACE
1-CELL LI-ION
BATT
OSC
MAX77301
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 aux-
iliary output, and an external power-on switch.
Ordering Information appears at end of data sheet.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
*U.S. Patent # 6,507,172.
For related parts and recommended products to use with this part, refer to www.maximintegrated.com/MAX77301.related.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6556; Rev 0; 1/13
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