Click here for production status of specific part numbers.
MAX77751
3.15A USB-C Autonomous Charger
for 1-Cell Li+ Batteries
Benefits and Features
General Description
•
•
•
•
•
•
Up to 16V Protection
The MAX77751 is a standalone, 3.15A charger with
13.7V Maximum Input Operating Voltage
3.15A Maximum Charging Current
6A Discharge Current Protection
No Firmware or Communication Required
Integrated USB Detection
• CC Detection for USB Type-C
• BC1.2 Detection for Legacy SDP, DCP, and CDP
• Automatic Input Current Limit Configuration
• Input Voltage Regulation with Adaptive Input
Current Limit (AICL)
®
integrated USB Type-C CC detection and reverse
boost capability. The fast-charge current and top-off
current thresholds are easily configured with resistors.
The MAX77751 operates with an input voltage of 4.5V
to 13.7V and has a maximum input current limit of 3A.
The IC also implements the adaptive input current limit
(AICL) function that regulates the input voltage by
reducing input current, to prevent the voltage of a weak
adapter from collapsing or folding back.
The USB Type-C Configuration Channel (CC) detection
pins on the MAX77751 enable automatic USB Type C
power source detection and input current limit
configuration. To support a variety of legacy USB as well
as proprietary adapters, the IC also integrates BC1.2
detection using the D+ and D- pins. The IC runs the CC
detection and BC1.2 detection automatically without any
software as soon as the USB plug is inserted.
•
•
Reverse Boost Capability up to 5.1V, 1.5A
Pin Control of All Functions
• Resistor-Configurable Fast-Charge Current
• Resistor-Configurable Top-Off Current
• ENBST Pin to Enable and Disable Reverse Boost
• STAT Pin to Indicate Charging Status
• INOKB Pin to Indicate Input Power-OK (POK)
• ITOPOFF Pin to Disable Charge
The IC also offers Reverse-Boost capability up to 5.1V,
1.5A, which can be enabled with the ENBST pin. The
STAT pin indicates charging status, while the INOKB pin
indicates valid input voltage. Charging can be stopped
by pulling the ITOPOFF pin low.
•
•
Integrated Battery True-Disconnect FET
3mm x 3mm, 24 Lead FC2QFN Package
Ordering Information appears at end of data sheet.
The MAX77751 is equipped with a Smart Power
Selector™ and a battery true-disconnect FET to control
the charging and discharging of the battery or isolate the
battery in case of a fault. The MAX77751 is offered in
several variants to support Li-ion batteries with various
termination voltages from 4.1V to 4.5V. The IC comes in
a 3mm x 3mm, 0.4mm pitch 24-lead FC2QFN package
making it suitable for low-cost PCB assembly.
Applications
•
•
•
•
•
•
•
Mobile Point-of-Sale (mPOS) Terminals
Portable Medical Devices
Wireless Headphones
GPS Trackers
Charging Cradles for Wearable Devices
Power Banks
Mobile Routers
USB Type-C is a registered trademark of USB Implementers Forum.
Smart Power Selector is a trademark of Maxim Integrated Products, Inc.
19-100802; Rev 4; 11/20