MAX77651

Ultra-Low Power PMIC with 3-Output SIMO and Power Path Charger for Small Li+

Highly-Integrated Battery Charging and Power Solution for Low-Power, Size-Constrained Applications

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New Content (2)

Design Note

Design Note 57: Can You Hear Me Now? Extend the Life of Your Hearable Device

Webcast

Improve Lifetime of your small battery driven IoT system

Features and Benefits

Highly Integrated
- Smart Power Selector™ Li+/Li-Poly Charger
- 3 Output, Single-Inductor Multiple-Output (SIMO) Buck-Boost Regulator
- 150mA LDO
- 3-Channel Current Sink Driver
- Analog MUX Output for Power Monitoring
Low Power
- 0.3µA Shutdown Current
- 5.6µA Operating Current (3 SIMO Channels + LDO)
Charger Optimized for Small Battery Size
- Programmable Fast-Charge Current from 7.5mA to 300mA
- Programmable Battery Regulation Voltage from 3.6V to 4.6V
- Programmable Termination Current from 0.375mA to 45mA
- JEITA Battery Temperature Monitors Adjust Charge Current and Battery Regulation Voltage for Safe Charging
Flexible and Configurable
- I²C Compatible Interface and GPIO
- Factory OTP Options Available
Small Size
- 2.75mm × 2.15mm × 0.7mm WLP Package
- 30-Bump, 0.4mm-Pitch WLP, 6x5 Array
- Small Total Solution Size (19.2mm²)

Product Details

The MAX77650/MAX77651 provide highly-integrated battery charging and power supply solutions for low-power wearable applications where size and efficiency are critical. Both devices feature a SIMO buck-boost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size. A 150mA LDO provides ripple rejection for audio and other noise-sensitive applications. A highly configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA).

The devices include other features such as current sinks for driving LED indicators and an analog multiplexer that switches several internal voltage and current signals to an external node for monitoring with an external ADC. A bidirectional I²C interface allows for configuring and checking the status of the devices. An internal on/off controller provides a controlled startup sequence for the regulators and provides supervisory functionality when the devices are on. Numerous factory programmable options allow the device to be tailored for many applications, enabling faster time to market.

Applications

Bluetooth Headphones/Hearables
Fitness, Health, and Activity Monitors
Internet of Things (IoT)
Portable Devices

Product Categories

Power Management
- PMIC (DC/DC, PowerPath, and Battery Charger)
- SIMO Regulators

Markets and Technologies

Consumer (1)
- Hearables and Wearables

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (3)

MAX77651EVKIT

Evaluation Kit for the MAX77650/MAX77651

MAX77650EVKIT

Evaluation Kit for the MAX77650/MAX77651

MAX32620FTHR

Evaluation Kit for the MAX32620/MAX77650/MAX17055

MAX77651EVKIT

View Detailed Evaluation Kit Information

The MAX77650/MAX77651 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77650/MAX77651. The EV kit allows for easy evaluation of the various MAX77650/MAX77651 features, including the SIMO buck-boost regulator, linear regulator, analog multiplexer, smart battery charger, on/off controller, and I²C interface.

The MAX77650 and MAX77651 EV kits are identical aside from the device (U1), silkscreen, and two resistive dividers at the SIMO outputs (see the MAX77650/MAX77651 EV Kit Differences section). The MAX77650/MAX77651 devices themselves have different output voltage ranges for the SIMO buck-boost regulator. Consult the device data sheet for more information.

Windows^®-based software provides a user-friendly graphical interface as well as a detailed register-based interface to exercise the features of the MAX77650/MAX77651.

Applications

Bluetooth Headphones/Hearables
Fitness, Health, and Activity Monitors
Internet of Things (IoT)
Portable Devices

Features & Benefits

Easy to Use
GUI Drives I²C Interface
On-Board Ammeter
On-Board Thermistor
On-Key Options
RGB LED Cluster
Assembled and Fully Tested
Emulates System Loading
On-Board Electronic Loads
Electronic Loads have steady-state, transient, and random modes
Demonstrates End-to-End Analog Multiplexer Implementation
On-Board ADC
Evaluates Both Push-Button and Slider-Switch On-Key Options

Resources

MAX77650EVKIT

View Detailed Evaluation Kit Information

Windows^®-based software provides a user-friendly graphical interface as well as a detailed register-based interface to exercise the features of the MAX77650/MAX77651.

Applications

Bluetooth Headphones/Hearables
Fitness, Health, and Activity Monitors
Internet of Things (IoT)
Portable Devices

Features & Benefits

Easy to Use
GUI Drives I²C Interface
On-Board Ammeter
On-Board Thermistor
On-Key Options
RGB LED Cluster
Assembled and Fully Tested
Emulates System Loading
On-Board Electronic Loads
Electronic Loads have steady-state, transient, and random modes
Demonstrates End-to-End Analog Multiplexer Implementation
On-Board ADC
Evaluates Both Push-Button and Slider-Switch On-Key Options

Resources

MAX32620FTHR

View Detailed Evaluation Kit Information

The MAX32620FTHR board is a rapid development platform designed to help engineers quickly implement battery-optimized solutions with the MAX32620 Arm^® Cortex^®-M4 microcontroller with FPU. The board also includes the MAX77650 ultra-low power PMIC and MAX17055 fuel gauge to provide efficient power conversion and battery management with minimal board space. The form factor is a small 0.9in x 2.0in dual-row header footprint that is compatible with breadboards and off-theshelf peripheral expansion boards. In addition to the dualrow headers, there are also two 12-pin Pmod™-compatible socket connectors for more expansion options. Also on board are common user-interface peripherals including two RGB indicator LEDs and two pushbuttons. These provide a power-optimized flexible platform for quick proofs-of-concept and early software development to enhance time to market.

Applications

Fitness Monitors
Portable Medical Devices
Sensor Hub
Sport Watches
Wearable Medical Patches

Features & Benefits

Convenient Development Platform
- 0.9in x 2.0in DIP Form Factor
- Pmod-Compatible Sockets
  - Supports SPI, UART, I²C, and GPIO
  - Accessible from Both Sides of Board
- Integrated Battery Management
  - Single-Cell Li+ Charger
  - Fuel Gauge
- User Interface Peripherals
  - Two RGB LEDs
  - Two Pushbuttons
MAX32620 Microcontroller Features
- 96MHz Arm Cortex-M4 Microcontroller with FPU
- 2048KB Flash
- 256KB SRAM
- Full-Speed USB
- SPI, I²C, UART, and 1-Wire
- 4-Channel 10-Bit ADC
- 49 Dual Voltage GPIO
- 3.9mm x 4.1mm, 81-Bump WLP
MAX77650 Ultra-Low Power PMIC Features
- Smart Power Selector Charger
  - Supports Li+/Li-Poly Batteries
  - 7.5mA to 300mA Charge Current
- Single Inductor Multiple Output (SIMO) Buck-Boost Regulator
  - 3 Outputs from a Single Inductor
- 150mA LDO Regulator
- I²C Configurable
- 2.75mm x 2.15mm, 30-Bump WLP
MAX17055 Fuel Gauge Features
- ModelGauge m5 EZ
  - Eliminates Battery Characterization
  - Eliminates Coulomb Counter Drift
- 7µA Operating Current
- 1.4mm x 1.5mm, 9-Bump WLP

Documentation & Resources

Data Sheet

MAX77650-MAX77651: Ultra-Low Power PMIC with 3-Output SIMO and Power Path Charger for Small Li+ Data Sheet (Rev. 7)
10/11/2018
PDF

User Guide

UG-6428: MAX77650/MAX77651 Programmer's Guide
6/23/2017
PDF

Design Note

Webcast

Improve Lifetime of your small battery driven IoT system
9/7/2023

Video

Technical Article

Simplifying TWS Earbud Designs with 1-Wire Connectivity
4/4/2022 Analog Dialogue
SIMO Switching Regulators: Extending Battery Life for Hearables and Wearables
3/31/2021
Hearables Get Longer Life with SIMO
7/2/2020
How a SIMO PMIC Enhances Power Efficiency for Wearable IoT Designs
10/11/2018

Tools & Simulations

Software Development

MAX77650/MAX77651 EV Kit Software, 1.0.3

ZIP

DCM SIMO Calculator, 3.0.2

XLSX

Reference Designs (1)

MAXREFDES1207

Heart-Rate Monitor Wrist Band Using the MAX77651B

MAXREFDES1207

Heart-Rate Monitor Wrist Band Using the MAX77651B

MAXREFDES1207

Heart-Rate Monitor Wrist Band Using the MAX77651B

View Detailed Reference Design Information

Features & Benefits

Description

The MAXREFDES1207 is a reference design for wearable application based on a total Analog Devices solution which includes the MAX32660, MAX30112, MAX77651B, and MAX40005. This solution demonstrates how a small size, low cost, low power, high accuracy heart-rate (HR) monitor can be easily implemented. This design can monitor heart rate using two green LEDs.

The MAX30112 is an optimized pulse-oximeter and heartrate AFE for wearable health. It has a high-resolution, optical readout signal-processing channel with built-in ambient light cancellation as well as high-current LED driver DACs to form a complete optical readout signal chain. With external LED(s) and photodiode(s), the MAX30112 offers the lowest power, highest performance heart-rate detection solution for wrist applications. The MAX77651B provides highly-integrated battery charging and power supply solutions for low-power wearable applications where size and efficiency are critical. The device features a SIMO buckboost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size. A highly configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA). The MAX32660 is an ultra-low-power, cost-effective, highly- integrated microcontroller unit (MCU) designed for battery- powered devices and wireless sensors. It combines a flexible and versatile power management unit with the powerful Arm^® Cortex^®-M4 with floating point unit (FPU). The MAX40005 is a tiny, single comparator which is ideal for a wide variety of portable electronics applications such as cell phones, media players, and notebooks that have extremely tight board space and power constraints. The design also contains an FTDI FT234 USB-to-serial UART interface.

Parts Used

Resources

MAXREFDES1207 Design Files

ZIP

2.83 M

Product Recommendations

MAX77651 Companion Parts

Recommended Related Parts

MAX77734, MAX17055, MAX77650.

Design Resources

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 Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
MAX77651AEWV+	Material Declaration	Reliability Data	Wafer-Level Package 5x6 Bump, Full Array	Ultra Librarian SamacSys
MAX77651AEWV+T	Material Declaration	Reliability Data	Wafer-Level Package 5x6 Bump, Full Array	Ultra Librarian SamacSys
MAX77651BEWVA+	Material Declaration	Reliability Data	Wafer-Level Package 5x6 Bump, Full Array	Ultra Librarian SamacSys
MAX77651BEWVA+T	Material Declaration	Reliability Data	Wafer-Level Package 5x6 Bump, Full Array	Ultra Librarian SamacSys
Wafer Fabrication Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.