Piezoelectric Horn Driver with Boost Converter
• 3V Operation
• Low Quiescent Current
• 10V Boost Converter
• Low Horn Driver On-Resistance
• Compatible with RE46C117
• Smoke Detectors
• CO Detectors
• Personal Security Products
• Electronic Toys
2V to 5V
The RE46C317/18 are CMOS piezoelectric horn driver
ICs with built-in boost converter. They are intended for
use in 3V battery or battery-backed applications. The
circuits feature a boost converter and a driver circuit
suitable for driving a piezoelectric horn.
The RE46C317/18 are compatible with the RE46C117
device and offer lower standby current.
The RE46C317 has three valid states of Horn Enable
(tri-state, low and high), while the RE46C318 has only
two valid states, low and high.
Note 1: Schottky diode D1 must have the maximum peak current rating of at least 1A. For best results, the
forward voltage spec should be less than 0.5V at 1A.
2: Inductor L3 must have the maximum peak current rating of at least 1A. For best results, the DC resistance
should be less than 0.5.
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