MAX77928

RECOMMENDED FOR NEW DESIGNS

10A 3:1/2:1/1:1 Switched-Capacitor Direct Charger for 1S Li-Ion Battery

Industry leading solution for 45W fast-charging 1S Li-Ion Battery

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: price unavailable

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Overview

10A Bi-Directional Switched-Capacitor Converter
- Integrated Power Switches
- Dual-Phase Configuration, 180-Degree Interleaved
- 2.5V to 16.9V Input Operating Range
- 3:1/2:1/1:1 from VIN to VOUT for Battery Charging
- 1:3/1:2/1:1 from VOUT to VIN for OTG Mode
- 96.2% Efficiency at 4.4V, 9A Output with 3:1 Ratio and Total 8 x 22μF 0603 CFLY
- Programmable Switching Frequency from 200kHz to 1.5MHz
2-Channel Gate Drivers to Drive External MOSFET(s) or GaN FET(s) for OVP or Input Selection
Integrated VB FET with 24V AMR and 40mΩ Switch
Regulations
- Input Current Regulation
- Battery Voltage Regulation
- Thermal Regulation
12-Bit ADC
- VIN/PMID/VEXT1/VEXT2/VOUT/Battery Differential Voltage Measurement
- Input Current Measurement
- External Thermistor Voltage Measurement
- Die Temperature Measurement

Protections
- VIN/VOUT/VEXT1/VEXT2 UVLO and OVLO
- Overcurrent Protection for Both Directions
- Flying Capacitor Short/Open Protection
- Battery (BATP – BATN) OVLO
- Output-to-Input Reverse Current Protection
- NTC Overtemperature Shutdown
- Die Temperature Alarms and Thermal Shutdown
- Watchdog Timer
- BST UVLO and PVDD UVLO
Frequency Dithering
Skip Mode and Audio Mode
Chip Enable Input and VB FET Auto Mode Enable
Frequency Synchronization for Parallel Operation
I²C Interface
0.4mm Pitch, 11 x 8 WLP Package

The MAX77928 is a 10A bi-directional 3:1/2:1/1:1 switched-capacitor converter (SCC) Direct Charger for a 1S Li-ion battery.

For 1S charging configurations, the device can operate in forward mode as a step-down switched-capacitor converter with a 3:1 or 2:1 input-voltage-to-output-voltage conversion ratio. For OTG power configurations, it can operate in reverse mode as a step-up converter with a 1:3 or 1:2 voltage conversion ratio. For both directions, bypass mode (1:1 conversion ratio) is supported. These modes are I²C configurable.

The device integrates 2-channel gate drivers to drive external MOSFET(s) or GaN FET(s) for overvoltage protection or input selection.

The device can regulate the output voltage and input current. The regulation targets for these are I²C programmable.

Please see the Data Sheet for the full description.

APPLICATIONS

Smartphones
Tablets
Single Cell Li-Ion Charger
Portable Devices

Part Models: 2
1ku List Price: price unavailable

Documentation

Data Sheet 1

MAX77928: 10A 3:1/2:1/1:1 Switched-Capacitor Direct Charger for 1S Li-Ion Battery Data Sheet (Rev.0) 01/20/2026

User Guide 1

MAX77928EVKIT User Guide: Evaluation Kit for MAX77928 (Rev.0) 01/20/2026

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX77928EWN+	WLCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
MAX77928EWN+T	WLCSP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluation Board for MAX77928

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Features and Benefits

Evaluates the MAX77928 10A 3:1/2:1/1:1 Switched-Capacitor Direct Charger for a 1S Li-Ion Battery
Demonstrates 10A Bi-Directional Switched-Capacitor Converter
Demonstrates 3:1/2:1/1:1 from V_IN to V_OUT for Battery Charging
Demonstrates 1:3/1:2/1:1 from V_OUT to V_IN for OTG Mode
Demonstrates 2-Channel Gate Drivers to Drive External MOSFET(s) or GaN FET for OVP or Input Selection

Demonstrates Integrated VB FET with 24V AMR and 40mΩ Switch
Demonstrates 12bit ADC
Demonstrates SYNC Operation
Demonstrates Skip Mode and Audio Mode
Demonstrates Frequency Dithering
Fully Assembled and Tested
On-Board I²C Serial Interface
Windows 7 or Newer Compatible Software

Product Details

The MAX77928 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that evaluates the MAX77928, a bi-directional 3:1/2:1/1:1 switched-capacitor converter (SCC) direct charger for a 1S battery. The MAX77928 EV kit includes the IC evaluation board with an integrated I²C communication interface and a USB micro-B cable. Windows^® based graphical-user interface (GUI) software is available for use with the EV kit and can be downloaded from ADI’s website at www.analog.com/products/MAX77928evkit. A Windows 7 or newer Windows operating system is required to use the EV kit software.

Resources

MAX77928EVKIT User Guide: Evaluation Kit for MAX77928 (Rev.0)
1/20/2026

MAX77928EVKIT Gerber Files
1/20/2026

Software

MAX77928EVKIT GUI Software (Rev.1.0)
13.38 MB

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