NJW4814

Features

• Boost Converter (
  Block Output Switch Voltage (40V max.)
  Switching Current (1.5A min.)
  PWM Control
  Operating Voltage Range (2.7 to 5.5V)
  Oscillation Frequency Range (380k to 1MHz)
  Soft Start Function (48ms typ.)
  Over Current Protection
  Over Voltage Protection)
• H-Bridge Driver Block (
  Internal 2 Channel H-Bridge
  Each Channel Operates Individually
  Over Current Protection (±300mA typ.)
  Operating Voltage Range (7.0 to 35V)
  Switching Frequency (300kHz max.)
  Output Shut Down Control
  Fault Indicator Output)
• Under Voltage Lockout
• Built-in Thermal Shutdown
• Standby Function
• Package Outline (NJW4814MLE : EQFN24-LE)

General Description

The NJW4814 is a dual H-bridge driver with boost converter IC. It can boost the output voltage from Li-ion battery and/or a 5V power supply and drives a piezo device by two H- bridge drivers. 48ms of internal fixed soft start function of the boost circuit sets a limit to startup current. The dual H-bridge drivers have independent signal inputs and a fault output function, therefore the NJW4814 improves controllability from a microcomputer.The input frequency of H-bridge driver is up to 300kHz.