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MAX77301/MAX77301A
JEITA-Compliant, Li+ Charger with Smart
Power Selector, Automatic Detection, and USB
Enumeration
General Description
Benefits and Features
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 integrates in-
dependent 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.
● 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
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 stan-
dard input adapters. When enumeration is enabled, the IC
automatically negotiates with a USB host, making it possi-
ble to achieve the highest-charging current available from
a USB 2.0 device or USB charger without processor inter-
vention. The adapter type detection is compliant with USB
2.0 as well as battery charging Specification Revision 1.1.
● Thermal Regulation Prevents Overheating
● LED Indicator for Charge Done, Precharge, and Time/
Temperature Error
The IC controls the charging sequence for single-cell
Li+ batteries from battery detection, prequalification, fast
charge, top-off, and charge termination. Charging is con-
trolled using constant current, constant voltage and con-
stant die-temperature (CCCVCTj) regulation for safe op-
eration under all conditions. The IC is also compliant with
JEITA battery charging requirements.
2
● Serial (400kHz) I C-Compatible Interface
● 6µA (typ) Shutdown Current
● 2.44mm x 2.44mm, 25-Bump WLP Package
Ordering Information appears at end of data sheet.
Simplified Operating Circuit
4.0V TO 6.6V
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 se-
lection switches the system from battery to external pow-
er.
(+16V OVP)
BUS
SYS
V
BUS
SYSTEM
LOAD
2
I C
CHARGE AND
SYS LOAD
SWITCH
CONTROL
LOGIC
D+
D-
USB
INTERFACE
1-CELL LI-ION
BATT
2
OSC
The I C interface provides full programmability of battery
MAX77301
charge characteristics, input current limit, and protection
features. This provides flexibility for use with a wide range
of adapter and battery sizes.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
Other features include undervoltage lockout (UVLO), over-
voltage protection (OVP), charge status and fault flags, in-
put power-OK monitor, charge timer, 3.3V/10mA auxiliary
output, and an external power-on switch.
*U.S. Patent # 6,507,172
Applications
• Smartphones, Bluetooth Headsets • AR/VR Glasses
• Hearables, Wearables • Portable Devices
19-6556; Rev 1; 12/20
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