MP2661
4.65V System, 500mA, I2C-Controlled
Battery Charger with Power Path
Management for Single-Cell Li-Ion Battery
DESCRIPTION
FEATURES
The MP2661 is a highly integrated, single-cell,
Fully Autonomous Charger for Single-Cell
Li-Ion and Li-Polymer Batteries
Complete Power Path Management for
Simultaneously Powering the System and
Charging the Battery
±0.5% Charging Voltage Accuracy
13V Maximum Voltage for the Input Source
I2C Interface for Setting Charging
Parameters and Status Reporting
Fully Integrated Power Switches and No
External Blocking Diode Required
Built-In Robust Charging Protection
Including Battery Temperature Monitoring
and Programmable Timer
PCB Over-Temperature Protection
(PCB_OTP)
System Reset Function
Integrated Battery Disconnect Function
Thermal Limiting Regulation On-Chip
Safety-Related Certification:
o IEC 62368-1 CB Certification
Available in a WLCSP-9 (1.55mmx1.55mm)
Package
lithium-ion
(Li-ion)
and
lithium-polymer
(Li-polymer) battery charger with system power
path management for space-limited, portable
applications. The MP2661 uses input power from
either an AC adapter or a USB port to supply the
system load and charge the battery
independently. The charger features constant
current pre-charge (PRE.C), constant current
(CC) fast charge, and constant voltage (CV)
regulation, charge termination, and auto-
recharge.
The power path management function ensures
continuous power to the system by automatically
selecting the input, the battery, or both to power
the system. This power stage features a low
dropout regulator from the input to the system
and a 100mΩ switch from the battery to the
system. Power path management separates the
charging current from the system load, which
allows for proper charge termination and keeps
the battery in full-charge mode.
The MP2661 provides short-circuit protection
(SCP) by limiting the current from the input to the
system, and the battery to the system. SCP
protects the Li-ion battery from being damaged
by excessively high currents. If the battery
voltage (VBATT) drops below its configurable
under-voltage lockout (UVLO) threshold, then
the path between the battery and the system is
cut off to prevent the Li-ion battery from being
over-discharged. An integrated I2C control
interface allows the MP2661 to program the
charging parameters, such as the input current
APPLICATIONS
Wearable Devices
Smart Handheld Devices
Fitness Accessories
Smartwatches
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.
For MPS green status, please visit the MPS website under Quality
Assurance. “MPS” and “The Future of Analog IC Technology” are registered
trademarks of Monolithic Power Systems, Inc.
limit (IIN_LIM), minimum input voltage (VIN_MIN
)
regulation, charging current, battery regulation
voltage, safety timer, and battery UVLO.
The MP2661 is available in a WLCSP-9
(1.55mmx1.55mm) package.
MP2661 Rev. 1.1
6/22/2021
MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021MPS. All Rights Reserved.
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