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  Microchip Technology Semiconductor Electronic Components Datasheet  

RE46C318 Datasheet

Piezoelectric Horn Driver

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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
2V to 5V
V1
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
VDD
LX
VSS
1
2
3
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 0.5.
2012-2013 Microchip Technology Inc.
DS20002301B-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

RE46C318 Datasheet

Piezoelectric Horn Driver

No Preview Available !

RE46C317/18
Functional Block Diagram
VDD
HRNEN
Tri-state Logic
Level Shifter
(RE46C317 Only)
Standard Logic
Level Shifter
(RE46C318 Only)
R1
Voltage Reference
+
-
+
-
R2
VSS
Horn Driver
Gate Control
VO
HORNB
HORNS
FEED
LX
R3
DS20002301B-page 2
2012-2013 Microchip Technology Inc.


Part Number RE46C318
Description Piezoelectric Horn Driver
Maker Microchip
Total Page 22 Pages
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