MAX14745:Wearable Charge-Management Solution

Extends Battery Life of Wearable Electronics

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).

Key Features
  • 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
MAX14745: Typical Application Circuit
MAX14745: Typical Application Circuit
  • Fitness Monitors
  • Rechargeable IoT devices
  • Wearable Electronics
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MAX14745 Data SheetMAX14745.pdf
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesBattery Charger FeaturesInterface TypeVIN
Oper. Freq.
MAX14745Step-DownReset Output
Serial Interface
Current Limit
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input
Design kits & evaluation modules
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX14745AEWX+ActiveWLP,;36 pin;WLP;-40°C to +85°CLead Free
MAX14745AEWX+TActiveWLP,;36 pin;WLP;-40°C to +85°CLead Free
MAX14745CEWX+ActiveWLP,;36 pin;WLP;-40°C to +85°CLead Free
MAX14745CEWX+TActiveWLP,;36 pin;WLP;-40°C to +85°CLead Free
MAX14745DEWX+ActiveWLP,;36 pin;WLP;-40°C to +85°CLead Free
MAX14745DEWX+TActiveWLP,;36 pin;WLP;-40°C to +85°CLead Free
MAX14745.pdf MAX14745