Dual Half-Bridge Piezoelectric Driver with Step-up DC-DC Converter

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Overview

The FAN8841 is a single-chip piezoelectric actuator driver consisting of a step-up DC-DC converter with integrated 36 V boost switch and the dual half-bridge output stages. The step-up DC-DC converter operates in Critical Conduction Mode (CRM) in order to reduce switching loss at the DC-DC converter for high efficiency. It is optimized to work in a coupled-inductor configuration to provide output voltages in excess of 60 V. The step-up DC-DC converter has a soft-start capability that limits the inrush current during startup. Over-voltage protection and over-current protection are included. Under-voltage protection is used to disable the dual half-bridge gate driver when the step-up DC-DC converter output voltage is lower than the specified threshold voltage. The boost voltage is set using external resistors and analog voltage at the VCON pin and step-up current limit is programmable via the external resistor at the OCP pin. The output Half-bridge is integrated with 75 V P- and N-channel for the piezoelectric actuator driving. An open drain Fault-out (FO) signal indicates if an abnormal over-voltage has occurred.

  • Portable Devices
  • Step-up DC-DC Converter
  • Integrated Step-up Power Switch up to 36 V
  • Wide Operating Voltage Range of 2.7 to 5.5 V
  • Adjustable Step-up Output Voltage by VCON
  • Adjustable Step-up Switch Current Limit
  • Zero Current Detector (ZCD)
  • Internal Soft-Start
  • Built-in Protection Circuit
  • Under-Voltage Protection (UVP)
  • Over-Voltage Protection (OVP)Piezo Actuator Driver
  • Integrated Half-Bridge Switches (VDS=75 V)
  • Dual Half-Bridge Piezoelectric Driver
  • Built-in Shutdown FunctionPackage Information
  • Small 4.0 mm × 4.0 mm MLP

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FAN8841MPX

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Active

CAD Model

Pb

A

H

P

WQFN-24

1

260

REEL

3000

Y

1

5

5.5

75

-

-

150

$1.4364

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