Wearable Power Management Solution

Description

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The MAX20353 is a highly integrated and programmable power management solution designed for ultra-low-power wearable applications. It is optimized for size and efficiency to enhance the value of the end product by extending battery life and shrinking the overall solution size. A flexible set of power-optimized voltage regulators, including multiple bucks, boost, buck-boost, and linear regulators, provides a high level of integration and the ability to create a fully optimized power architecture. The quiescent current of each regulator is specifically suited for 1µA (typ) to extend battery life in always-on applications.

The MAX20353 includes a complete battery management solution with battery seal, charger, power path, and fuel gauge. Both thermal management and input protection are built into the charger.

The device also includes a factory programmable button controller with multiple inputs that are customizable to fit specific product UX requirements.

Three integrated LED current sinks are included for indicator or backlighting functions, and an ERM/LRA driver with automatic resonance tracking is capable of providing sophisticated haptic feedback to the user.

The device is configurable through an I²C interface that allows for programming various functions and reading device status, including the ability to read temperature and supply voltages with the integrated ADC.

This device is available in a 56-bump, 0.5mm pitch 3.71mm x 4.21mm, wafer-level package (WLP) and operates over the -40°C to +85°C extended temperature range.

Key Features

• Extend Battery Use Time Between Battery Charging
  • 2 x Micro-I_Q Buck Regulators (<1μA I_Q (typ) Each)
    • 350mA Output
    • Buck1: 0.7V to 2.275V in 25mV Steps
    • Buck2: 0.7V to 3.85V in 50mV Steps
  • Micro-I_Q LV LDO/Load Switch (1μA I_Q (typ))
    • 1.16V to 2.0V Input Voltage
    • 50mA Output
    • 0.5V to 1.95V Output, 25mV Steps
  • Micro-I_Q LDO/Load Switch (1μA I_Q (typ))
    • 1.71V to 5.5V Input Voltage
    • 100mA Output
    • 0.9V to 4V, 100mV Steps
  • Micro-I_Q Buck-Boost Regulator (1.3μA I_Q (typ))
    • 250mW Output
    • 2.5V to 5V in 100mV Steps
• Easy-to-Implement Li+ Battery Charging
  • Wide Fast Charge Current Range: 5mA to 500mA
  • Smart Power Selector
    • 28V/-5.5V Tolerant Input
    • Programmable JEITA Current/Voltage Profiles
• Minimize Solution Footprint Through High Integration
  • Safe Output LDO
    • 15mA When CHGIN Present
    • 5V or 3.3V
  • Haptic Driver
    • ERM/LRA Driver with Quick Start And Stored Pattern RAM
    • Automatic Resonance Tracking (LRA only)
    • Closed Loop Automatic Braking (LRA only)
• Support Wide Variety of Display Options
  • Micro-I_Q Boost Regulator (2.4μA I_Q (typ))
    • 300mW Output
    • 5V to 20V in 250mV Step
  • 3 Channel Current Sinks
    • 20V Tolerant
    • Programmable from 0.6 to 30mA
• Optimize System Control
  • Power-On/Reset Controller
  • Programmable Push-Button Controller
  • Programmable Supply Sequencing
  • Factory Shelf Mode
  • On-Chip Voltage Monitor Multiplexer and Analog-to-Digital Converter (ADC)

Applications/Uses

• Wearable Devices
• IoT