MAX14676, MAX14676A:Wearable Charge Management Solution

Extend Battery Life of Wearable Electronics

The MAX14676/MAX14676A are battery-charge-management solutions ideal for low-power wearable applications. These devices include a linear battery-charger with a Smart Power Selector™, ModelGauge™ fuel gauge, and several power-optimized peripherals. They feature an ultra-low-power buck regulator with a quiescent current of 900nA (typical) and 74% efficiency with 10μA output. The battery charger features Smart Power Selector operation, allowing operation with dead battery. It limits input current based on a register setting. If the charger power source is unable to supply the entire system load, the smart power control circuit will supplement the system load with current from the battery. The MAX14676/MAX14676A embed a Maxim proprietary ModelGauge fuel gauge to provide an accurate estimate of the available capacity for rechargeable lithium batteries. The MAX14676/MAX14676A include a synchronous high-efficiency step-down converter. The device features a fixed-frequency PWM mode for tighter regulation, and a burst mode for increased efficiency during light-load operation. The MAX14676/MAX14676A have a boost regulator and three programmable current sinks that can be used to drive a variety of LED configurations. The boost converter is controlled independently from the current sinks, and they can be also used separately. The MAX14676/MAX14676A feature a power switch controller that allows the device to be turned on and off by a pushbutton. This controller also provides a delayed reset signal and voltage sequencing. These devices are available in a 42-bump, 0.5mm pitch, 3.497mm x 3.118mm wafer-level package (WLP).

Key Features
  • Extend System Use Time Between Battery Charging
    • 1.8V Low-IQ 200mA Buck Regulator
      • 0.9μA (typ) Quiescent Current
      • Automatic Burst or Forced-PWM Modes
    • ModelGauge with Accurate State-of-Charge
  • Easy-to-Implement Li+ Battery Charging
    • Smart Power Selector
    • 28V Tolerant Input
    • Thermistor Monitor
  • Minimize Power-Management Footprint though High Integration
    • 3.2V Low-IQ 100mA LDO
    • 2.0V Always-On 50μA LDO
    • +5V Safe Output LDO
    • 6.6V Low-IQ 120μA Charge Pump
  • Support a Wide Variety of Display Options
    • 5V to 17V Output Boost Converter
    • 3-Channel Adjustable High-Voltage Current Sinks
  • Optimize System Control
    • Pushbutton to Enable Ultra-Low-Power Mode and Power-On Voltage Sequencing
    • I2C Control
  • Fitness Monitors
  • GPS Watches
  • Portable Medical Devices
  • Wearable Electronics
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MAX14676-MAX14676A Data SheetMAX14676-MAX14676A.pdf
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesLCD/LED/Flash/CCD FeaturesBattery Charger FeaturesInterface TypeVIN
Oper. Freq.
Reset Output
Serial Interface
Current Limit
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
White LED
Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX14676AEWO+ActiveWLP,;42 pin;WLP;-40°C to +85°CLead Free
MAX14676AEWO+TActiveWLP,;42 pin;WLP;-40°C to +85°CLead Free
MAX14676EWO+ActiveWLP,;42 pin;WLP;-40°C to +85°CLead Free
MAX14676EWO+TActiveWLP,;42 pin;WLP;-40°C to +85°CLead Free
MAX14676-MAX14676A.pdf MAX14676A
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MAX14676A.pdf MAX14676A