FAN8841 Series

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

Catalog

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

Part	Package / Case	Interface	Mounting Type	Operating Temperature [Min]	Operating Temperature [Max]	Load Type	Voltage - Load [Max]	Voltage - Load [Min]	Applications	Fault Protection	Technology	Output Configuration	Voltage - Supply [Min]	Voltage - Supply [Max]	Supplier Device Package
ON Semiconductor FAN8841MPX	24-WFQFN Exposed Pad	Logic	Surface Mount	-55 °C	150 °C	Inductive	60 V	13 V	DC-DC Converters	ESD Over Voltage UVLO	Power MOSFET	Half Bridge (2)	2.7 V	5.5 V	24-MLP (4x4)

Catalog

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

Key Features

• 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

Description

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.