MAX14745

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PMIC with Ultra Low IQ Voltage Regulators and Battery Charger for Small Lithium Ion Systems

Extends Battery Life of Wearable Electronics

Data Sheet (Rev. 23) Product Selection Table
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Overview

  • Extend System Use Time Between Battery Charging
    • Dual Ultra-Low-IQ 200mA Buck Regulators
      • Output Programmable from 0.8V to 2.375V and 0.8V to 3.95V
      • 0.9µA (typ) Quiescent Current (Buck 1)
      • Optional Fixed Peak-Current Mode to Optimize Ripple Frequency in Noise-Sensitive Applications
    • Three Ultra-Low-IQ 100mA LDOs
    • LDO1
      • Output Programmable from 0.8V to 3.6V
      • 0.6µA (typ) Quiescent Current
      • 2.7V to 5.5V Input with Dedicated Pin
    • LDO2/3
      • Output Programmable from 0.9V to 4V
      • 1µA (typ) Quiescent Current
      • 1.71V to 5.5V Input with Dedicated Pin
  • Easy-to-Implement Li+ Battery Charging
    • Smart Power Selector
    • 28V/-5.5V Tolerant Input
    • Thermistor Monitor
  • Minimize Solution Footprint Through High Integration
    • Provides Five Regulated Voltage Rails
    • Switch Mode Option on Each LDO
  • Optimize System Control
    • Monitors Pushbutton for Ultra-Low Power Mode
    • Power-On Reset Delay and Voltage Sequencing
    • On-Chip Voltage Monitor Multiplexer

The MAX14745 is a battery-charge-management solution ideal for low-power wearable applications. The device includes a linear battery charger with a smart power selector and several power-optimized peripherals. The MAX14745 features two ultra-low quiescent current buck regulators and three ultra-low quiescent current low-dropout (LDO) linear regulators, providing up to five regulated voltages, each with an ultra-low quiescent current, allows designers to minimize power consumption and extend battery life in 24/7 operation devices, such as those in the wearable market.

The battery charger features a smart power selector that allows operation on a dead battery when connected to a power source. To avoid overloading a power adapter, the input current to the smart power selector is limited based on an I2C register setting. If the charger power source is unable to supply the entire system load, the smart power control circuit supplements the system load with current from the battery. The charger also supports temperature dependent charge currents.

The two synchronous, high-efficiency step-down buck regulators feature a variable frequency mode for increased efficiency during light-load operation. The output voltage of these regulators can be programmed through I2C with the default preconfigured. The buck regulators can support dynamic voltage scaling to further improve system power consumption.

The three configurable LDOs each have a dedicated input pin. Each LDO regulator output voltage can be programmed through I2C with the default preconfigured. The linear regulators can also be configured to operate as power switches that may be used to disconnect the quiescent load of the system peripherals.

The MAX14745 features a programmable power controller that allows the device to be configured for applications that require the device be in a true-off, or always-on, state. The controller also provides a delayed reset signal and voltage sequencing.

The MAX14745 is available in a 36-bump, 0.4mm pitch, 2.72mm x 2.47mm wafer-level package (WLP).

Applications

  • Fitness Monitors
  • Rechargeable IoT devices
  • Wearable Electronics
MAX14745
PMIC with Ultra Low IQ Voltage Regulators and Battery Charger for Small Lithium Ion Systems
MAX14745: Typical Application Circuit
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Documentation

Data Sheet 1

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Evaluation Kits

MAX14745EVKIT

Evaluation Kit for the MAX14745

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Features and Benefits

  • RoHS Compliant
  • Proven PCB Layout
  • Full Assembled and Tested
  • I2C Serial Interface

Product Details

The MAX14745 evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX14745 wearable charge-management solution with I2C capability for low-power wearable application. The device includes a linear battery charger, smart power selector, two ultra-low quiescent current buck regulators, and three low-dropout (LDO) linear regulators.

Refer to the MAX14745 IC data sheet for detailed information regarding the operation and features of the devices.

Applications

  • Fitness Monitors
  • Rechargeable IoT devices
  • Wearable Electronics

MAX14745EVSYS

Evaluation Kit for the MAX14745

Buy Now View Details

Features and Benefits

  • USB Power Option
  • Flexible Configuration
  • On-Board LED Indicator and Battery Simulation
  • Sense Test Point for Output Voltage Measurement
  • Windows® 8/10-Compatible GUI Software
  • Fully Assembled and Tested

Product Details

The MAX14745 evaluation system kit (EVSYS kit) is a fully assembled and tested circuit board that demonstrates the MAX14745 low power wearable power management integrated circuit (PMIC). The MAX14745 features two bucks, three linear regulators, and a battery charger.

The MAX14745 EVSYS kit comes with the MAX14745 board, the MAXPICO2PMB# board, and two USB micro-B cables. The EVSYS kit comes with the MAX14745AEWX+ installed. The MAX14745 is configurable through an I2C interface that allows for programming various functions and reading the device status. The EV kit GUI application sends commands to the MAXPICO2PMB# adapter board to configure the device.

Applications

  • Fitness Monitors
  • Rechargeable IoT devices
  • Wearable Electronics
MAX14745EVKIT
Evaluation Kit for the MAX14745
MAX14745EVSYS
Evaluation Kit for the MAX14745

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