NJW4814

NJW4814 Dual H-Bridge Driver with Boost Converter 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. ■ PACKAGE OUTLINE NJW4814MLE FEATURES Boost Converter Block H-Bridge Driver Block Under Voltage Lockout Built-in Thermal Shutdown Standby Function Package Outline Output Switch Voltage Switching Current PWM Control Operating Voltage Range Oscillation Frequency Range Soft Start Function Over Current Protection Over Voltage Protection 40V max. 1.5A min. 2.7 to 5.5V 380k to 1MHz 48ms typ. Internal 2 Channel H-Bridge Each Channel Operates Individually Over Current Protection Operating Voltage Range Switching Frequency Output Shut Down Control Fault Indicator Output 300mA typ. 7.0 to 35V 300kHz max. NJW4814MLE : EQFN24-LE Ver.2015-04-07 -1- NJW4814 PIN CONFIGURATION OUTA1 PGND OUTB1 VDD_HB VOVP OUTB2 18 17 16 15 14 13 SW 19 PGND 20 RADJ 21 FB 22 RT 23 GND 24 12 OUTA2 11 PGND 10 FLT 9 INB2 8 INB1 7 INA2 123456 Exposed PAD on backside connect to GND INA1 SHDNBb SHDNAb STBYb VDD_SW IN- < Top View> NJW4814M...