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3.15A USB Type-C Autonomous Charger for 1-Cell Li+ Batteries

Industry's First Autonomous Charger with Integrated USB Type-C Detection

Product Details

The MAX77751 is a standalone, 3.15A charger with 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.

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.

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.

Key Features

  • Up to 16V Protection
  • 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)
  • 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
  • Integrated Battery True-Disconnect FET
  • 3mm x 3mm, 24 Lead FC2QFN Package

Applications/Uses

  • Mobile Point-of-Sale (mPOS) Terminals
  • Portable Medical Devices
  • Wireless Headphones
  • GPS Trackers
  • Charging Cradles for Wearable Devices
  • Power Banks
  • Mobile Routers
Parametric specs for Battery Chargers
Charging VIN (V) (max) 14
Max. ICHG (A) 3.15
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 16
Charger (V) 4.1
4.15
4.2
4.35
4.5
4.3
4.4
4.45
Oper. Temp. (°C) -40 to +85
Package/Pins FC2QFN/24
Budgetary
Price (See Notes)
$1.31 @1k
Parametric specs for USB Charger Detectors
Protocol BC1.2
USB Type-C
VSUPPLY (Single) (V) (min) 4.7
VSUPPLY (Single) (V) (max) 14
VSIGNAL (V) (min) 0
Supported USB Battery Charging Specification BC1.2
USB Type-C
VBUS Tolerance (V) 16
ESD Protection +/-2kV HBM
Package/Pins FC2QFN/24
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Simplified Block Diagram

MAX77751: Simplified Block Diagram MAX77751: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX77751 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77751, the standalone 3.15A USB Type-C® autonomous charger.

The EV kit is a switch-mode charger and Smart Power Selector™ with autonomous configuration. The MAX77751 can operate from 4.5V to 14V input, with the fast-charge current up to 3.15A and maximum input current limit of 3A.

The EV kit features USB Type-C CC detection, battery charging compliant with the USB Battery Charging Specification Revision 1.2 (BC1.2), proprietary adapter detection upon input insertion, and automatic configuration of the charger input current limit to the maximum allowable current from the input source.

The MAX77751 has the reverse-boost capability, which is enabled by the ENBST pin to allow the 5.1V/1.5A output to CHGIN.

View Details

Features

  • Up to 16V Protection
  • 14V Maximum Input Operating Voltage
  • 3.15A Maximum Charging Current
  • 6A Discharge Current Protection
  • No Firmware or Communication Required
  • Integrated USB Detection
    • Integrated CC Detection for USB Type-C
    • Integrated BC1.2 Detection for Legacy SDP, DCP, and CDP
    • Automatic Input Current Limit Configuration
  • Input Voltage Regulation with Adaptive Input Current Limit (AICL)
  • 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
  • Integrated Power Path
  • Integrated Battery True-Disconnect FET
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

The MAX77751 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77751, the standalone 3.15A USB Type-C® autonomous charger.

The EV kit is a switch-mode charger and Smart Power Selector™ with autonomous configuration. The MAX77751 can operate from 4.5V to 14V input, with the fast-charge current up to 3.15A and maximum input current limit of 3A.

The EV kit features USB Type-C CC detection, battery charging compliant with the USB Battery Charging Specification Revision 1.2 (BC1.2), proprietary adapter detection upon input insertion, and automatic configuration of the charger input current limit to the maximum allowable current from the input source.

The MAX77751 has the reverse-boost capability, which is enabled by the ENBST pin to allow the 5.1V/1.5A output to CHGIN.

View Details

Features

  • Up to 16V Protection
  • 14V Maximum Input Operating Voltage
  • 3.15A Maximum Charging Current
  • 6A Discharge Current Protection
  • No Firmware or Communication Required
  • Integrated USB Detection
    • Integrated CC Detection for USB Type-C
    • Integrated BC1.2 Detection for Legacy SDP, DCP, and CDP
    • Automatic Input Current Limit Configuration
  • Input Voltage Regulation with Adaptive Input Current Limit (AICL)
  • 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
  • Integrated Power Path
  • Integrated Battery True-Disconnect FET
  • Proven PCB Layout
  • Fully Assembled and Tested

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Support & Training

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 14
Max. ICHG (A) 3.15
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 16
Charger (V) 4.1
4.15
4.2
4.35
4.5
4.3
4.4
4.45
Oper. Temp. (°C) -40 to +85
Package/Pins FC2QFN/24
Budgetary
Price (See Notes)
$1.31 @1k
Parametric specs for USB Charger Detectors
Protocol BC1.2
USB Type-C
VSUPPLY (Single) (V) (min) 4.7
VSUPPLY (Single) (V) (max) 14
VSIGNAL (V) (min) 0
Supported USB Battery Charging Specification BC1.2
USB Type-C
VBUS Tolerance (V) 16
ESD Protection +/-2kV HBM
Package/Pins FC2QFN/24

Key Features

  • Up to 16V Protection
  • 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)
  • 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
  • Integrated Battery True-Disconnect FET
  • 3mm x 3mm, 24 Lead FC2QFN Package

Applications/Uses

  • Mobile Point-of-Sale (mPOS) Terminals
  • Portable Medical Devices
  • Wireless Headphones
  • GPS Trackers
  • Charging Cradles for Wearable Devices
  • Power Banks
  • Mobile Routers

Description

The MAX77751 is a standalone, 3.15A charger with 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.

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.

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.

Simplified Block Diagram

MAX77751: Simplified Block Diagram MAX77751: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal