R&E International
A Subsidiary of Microchip Technology Inc.
RE46C108
Piezoelectric Horn Driver and Voltage Regulator
Product Specification
General Description
The RE46C108 is a piezoelectric horn driver with a
voltage regulator that can operate at 3.3V or 5V. It
is intended for applications requiring a 9V horn
driver with a low voltage logic supply. The horn
feedback control pin is designed for use with self-
oscillating piezoelectric horn but can also be used in
direct drive applications.
Applications
Smoke detectors
CO Detectors
Personal Security Products
Electronic Toys
Features
• Low Quiescent Current
• Low Horn Driver Ron
• Voltage Regulation to 3.3V or 5V
• Available in DIP and SOIC packaging
•
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging
Pin Configuration
REGSEL
VDD
REGOUT
FEED
HRNEN
HORNS
HORNB
VSS
1
8
Absolute maximum ratings
Supply Voltage Vdd ........………………………………….......-.5V to +14V
Input voltage Range Vin ...…………………………………..... -.3V to VDD+.3V, except FEED
FEED Input Voltage Range Vinf …………………………...… -10V to +22V
Input Current Iin ..............…………………………………..... 10mA, except FEED
Operating Temperature .......………………………………….. -40 to 85
°C
Continuous Output Current (HornS, HornB) .……………….. 30mA
Continuous Output Current (REGOUT) .…………………….. 55mA
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These
are stress ratings only and operation at these conditions for extended periods may affect device reliability.
This product utilizes CMOS technology with static protection; however proper ESD prevention procedures should be
used when handling this product. Damage can occur when exposed to extremely high static electrical charges
© 2009 Microchip Technology Inc.
DS22165A-page 1
RE46C108
Piezoelectric Horn Driver and Voltage Regulator
R&E International
Product Specification
A Subsidiary of Microchip Technology
Inc.
© 2009 Microchip Technology Inc.
DS22165A-page 2
Electrical Characteristics at TA = 25°C, VDD = 9V, Vss = 0V (unless otherwise noted).
Parameter
Test
Pin
Test Conditions
Limits
Min Typ Max
Units
Supply Voltage
Vdd
Operating
6.0 9.0 13.8
V
Standby Supply
Current
Vdd
Hrnen=Vss; No Loads
4
uA
Input Leakage
Hrnen,Resel
Vin=Vdd or Vss
-100 100
nA
FEED
Feed = +22V
20 50
uA
FEED
Feed = -10V
-50 -15
uA
Input Voltage Low
Hrnen,
Regsel
1.0
V
Input Voltage High
Hrnen,
Regsel
2.3
V
Output Low Voltage
Horns or
Hornb
Iout=16mA; Vdd=9V
Vdd=7.2V
0.3 0.5
0.9
V
V
Output High Voltage
Horns or
Hornb
Iout=-16mA; Vdd=9V
Vdd=7.2V
8.5 8.7
6.3
V
V
Regulator Voltage
Regout
Iout<50mA; Regsel=Vdd
Iout<50mA; Regsel=Vss
T
A
=-40 to 85
°C
See note #3
4.75 5.0 5.25
3.10 3.3 3.50
V
V
Line Regulation
Regout
6V<Vdd<12V; No load
30
mV
Load Regulation
Regout
0mA<Iout<20mA
100
mV
Brown-Out Threshold
Voltage
*See note #1
Vdd
Regsel=Vdd or Vss
Falling edge of Vdd
4.5 5.0 5.5
V
Brown-Out Pull Down
Current
Regout
Vdd=4.5V; Regout=2V
15 25
mA
Regout Overvoltage
Clamp
*See note #2
Regout
Regsel=Vdd; Iout > 1mA
Regsel=Vss; Iout > 1mA
5.5 6.0 6.5
3.7 4.0 4.3
V
V
Notes:
1/ The brown-out threshold voltage is the Vdd voltage at which the regulator will be disabled and Regout will be
pulled to Vss.
2/ In normal operation, the regulator will provide high-side current of up to 20mA, but current sinking capability is
typically under 1uA. The overvoltage clamp is intended to limit the voltage at Regout when it is pulled up by an
external source.
3/ The limits shown are 100% tested at 25C only. Test limits are guard-banded based on temperature
characterization to guarantee compliance at temperature extremes.
RE46C108
Piezoelectric Horn Driver and Voltage Regulator
R&E International
Product Specification
A Subsidiary of Microchip Technology
Inc.
Typical Application
Functional Block Diagram
Bandgap
Reference
© 2009 Microchip Technology Inc.
DS22165A-page 3
Output
Adjust
3
VDD
2
4
1
8
7
6
5
VSS
REGSEL
REGOUT
HRNEN
HORNB
HORNS
FEED
Clamp &
Shutdown
Circuit
RE46C108
Piezoelectric Horn Driver and Voltage Regulator
R&E International
Product Specification
A Subsidiary of Microchip Technology
Inc.
Information contained in this publication regarding device
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Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, K
EE
L
OQ
, K
EE
L
OQ
logo,
MPLAB, PIC, PICmicro,
PICSTART, rfPIC, SmartShunt and UNI/O are registered
trademarks of Microchip Technology Incorporated in the U.S.A.
and other countries.
FilterLab, Hampshire, Linear Active Thermistor, MXDEV, MXLAB,
SEEVAL, SmartSensor and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial Programming,
ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB Certified logo,
MPLIB, MPLINK, mTouch, nanoWatt XLP, PICkit, PICDEM,
PICDEM.net, PICtail, PIC
32
logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total
Endurance, TSHARC, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip Technology Incorporated in
the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2009, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California and
India. The Company’s quality system processes and procedures are for its
PIC
®
MCUs and dsPIC
®
DSCs, K
EE
L
OQ
®
code hopping devices, Serial
EEPROMs, microperipherals, nonvolatile memory and analog products. In
addition, Microchip’s quality system for the design and manufacture of
development systems is ISO 9001:2000 certified.
© 2009 Microchip Technology Inc.
DS22165A-page 4