A4WP Compliant High-Frequency Wireless Charging Receiver Frontend

NXXA4WP Archived
  • This page contains information on a product that is no longer manufactured (discontinued). Specifications and information herein are available for historical reference only.

The NX1A4WP is an A4WP (Alliance for Wireless Power) compliant wireless power receiver front end. It contains a high-voltage, highly efficient rectifier, integrated LDOs, a D1C-to-DC converter, a multi-channel 12-bit ADC, four GPIOs and a Fast-Mode I²C-bus interface. The integrated rectifier supports voltages of up to 20 V and is protected by an integrated automatic clamping function and an automatic over-power protection function. The DC-to-DC regulator delivers a nominal voltage of 5 V. The host microcontroller configures the on-chip controller for automatic interrupt-driven system control. The controller reads the rectifier output voltage, current level information, junction temperature and external temperature sensor information from the ADC. It controls the DC-to-DC converter as well as the GPIOs.

Product Details

Features

Key Features

  • 25 V tolerant antenna input pins
  • Automatic over-voltage protection of the antenna inputs
  • 6.78 MHz compatible integrated rectifier
  • High efficiency with an active rectifier and a DC-to-DC converter
  • Integrated LDOs (1.8 V and 3.3 V up to 100 mA) with auto enable and discharge path
  • Integrated DC-to-DC buck regulator with 5 V, 1.2 A output
  • Multi-channel 12-bit ADC subsystem
  • Temperature sensor (NTC) analog interface
  • USB bus power supply detection
  • 400 kHz I²C-bus target interface
  • Software and power-on reset of the on-chip digital controller
  • Programmable rectifier modes: active, half-active and passive
  • 2 digital General Purpose Input and Output ports (GPIOs) with open-drain outputs and up to 60 V tolerance for control and communication applications
  • 2 digital General Purpose Input and Output ports (GPIOs) with open-drain outputs and 25 V tolerance for control and communication applications
  • Protection circuitry:
    • Automatic over-power protection
    • Automatic AC short to ground for OVP option
    • Automatic DC-to-DC over-voltage protection lock out option
    • Over-temperature protection
    • Over-voltage protection
    • Under-voltage protection
    • Under-voltage lockout (for LDOs and DC-to-DC controller)
  • Specified from -40 °C to +85 °C ambient temperature
  • 3.56 mm x 3.41 mm WLCSP with 0.5 mm pitch

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