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| RE46C317 Datasheet, PDF (1/22 Pages) Microchip Technology – Piezoelectric Horn Driver with Boost Converter | |||
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RE46C317/18
Piezoelectric Horn Driver with Boost Converter
Features:
⢠3V Operation
⢠Low Quiescent Current
⢠10V Boost Converter
⢠Low Horn Driver On-Resistance
⢠Compatible with RE46C117
Applications:
⢠Smoke Detectors
⢠CO Detectors
⢠Personal Security Products
⢠Electronic Toys
Typical Application
V1
2V to 5V
L1
10 μH
C1
10 μF
Description:
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.
Package Types
RE46C317/18
PDIP, SOIC
FEED 1
VDD 2
LX 3
VSS 4
8 HRNEN
7 HORNS
6 HORNB
5 VO
RE46C317/18
FEED
HRNEN
R1
1.5M
C4
1 nF
VDD
HORNS
LX
HORNB
VSS
VO
D1
R2
200K
C3
10 μF
RE46C317 Only
High
Tri-state
Low
RE46C318 Only
High
Low
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 0.5ï.
ï£ 2012-2013 Microchip Technology Inc.
DS20002301B-page 1
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