R&E International
A Subsidiary of Microchip Technology Inc.
RE46C117
DC to DC Converter and Piezoelectric Horn Driver
Product Specification
General Description
Features
The RE46C117 is intended for use in 3V or 4.5V
battery or battery-backed applications. The circuit
features a DC-to-DC up-converter and driver circuit
suitable for driving a piezoelectric horn
•
•
•
•
Low Quiescent Current
10V Up Converter
Low Horn Driver Ron
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging
Applications
Smoke detectors
CO Detectors
Personal Security Products
Electronic Toys
Pin Configuration
FEED
1
8
HRNEN
VDD
2
7
HORNS
LX
3
6
HORNB
VSS
4
5
VO
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Input Voltage Range Except FEED
FEED Input Voltage Range
Input Current except FEED
Operating Temperature
Storage Temperature
Continuous Operating Current
(HornS, HornB, VO)
SYMBOL
VDD
VOUT
Vin
Vinfd
Iin
TA
TSTG
IO
VALUE
5
12
-.3 to Vdd +.3
-10 to +22
10
0 to 50
-55 to 125
40
UNITS
V
V
V
V
mA
°C
°C
mA
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 charge
© 2009 Microchip Technology Inc.
DS22159B-page 1
RE46C117
DC to DC Converter and Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Electrical Characteristics
Limits apply at Vdd=3V, Vss=0V, Cvo=10uF, TA=0°C to 50°C, unless otherwise noted.
Typical values are at TA=27°C.
Parameter
Supply Voltage
Standby Supply
Current
Quiescent Supply
Current
Quiescent Ivo
Symbol
Vdd
Iddstby
Iddq
Input Voltage Low
Ivoq
Iin
Iihf
Iilf
Vil
Input Voltage High
Vih
Output Low Voltage
Vol1
Output High
Voltage
Voh1
Input Leakage
VO Output Voltage
VO Efficiency
Brownout
Threshold
Test Conditions
Operating
HRNEN low; No loads; DC-DC
Running
HRNEN low; No loads;
VO=5V; Vlx=0.5V
Same conditions as above for Iddq
HRNEN Input, Vin=VDD or VSS
FEED=+22V; VO=10V
FEED=-10V; VO=10V
HRNEN Input
Min
Limits
Typ
Max
Units
2.0
—
5.0
V
—
14
—
uA
—
7
10.5
uA
—
-100
—
-50
—
4
—
20
-15
—
7.5
100
50
—
1
uA
nA
uA
uA
V
2.3
—
—
V
—
.3
.5
V
9.5
9.7
—
V
Vvo1
Vvo2
Voeff1
Voeff2
HRNEN Input
HORNB or HORNS; Iout=16mA;
Vdd=3V
HORNB or HORNS; VO=10V;
Iout=-16mA; Vdd=HRNEN=3V
Vdd=3V; HRNEN=3V: Iout=10mA
Vdd=3V; HRNEN=0V; Iout=10mA
Iload= 10mA, Vdd=3V; HRNEN=0V
Iload=100uA; Vdd=3V; HRNEN=0V
8.5
3.5
—
—
10
4
85
75
11
4.4
—
—
V
V
%
%
Vobvt
Falling edge of VO
3.2
3.6
4.0
V
Notes on Electrical Characteristics:
1. DC-DC converter in high boost mode (normal VO=10V) can draw current pulses of greater than 1 Amp and is therefore very
sensitive to series resistance. Critical components of this resistance are the inductor DC resistance, the internal resistance of the
battery and the resistance in the connections from the inductor to the battery, from the inductor to the LX pin and from the Vss2 pin
to the battery. In order to function properly under full load at Vdd=2V, the total of the inductor and the interconnect resistances
should not exceed 0.3 ohm. The internal battery resistance should be no more than 0.5 ohm and a low ESR capacitor of 10uF or
more should be connected in parallel with the battery to average current over the boost converter cycle.
2. In the Electrical Characteristics Table, wherever a specific VO value is listed under test conditions, the VO is forced externally
with the inductor disconnected and the DC-DC converter is not running.
3. The brown-out threshold voltage is the VO voltage at which the horn will be disabled.
4. The limits shown are 100% tested at 25C only. Test limits are guard-banded based on temperature characterization to guarantee
compliance at temperature extremes.
© 2009 Microchip Technology Inc.
DS22159B-page 2
RE46C117
DC to DC Converter and Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Functional Block Diagram
© 2009 Microchip Technology Inc.
DS22159B-page 3
RE46C117
DC to DC Converter and Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Typical Application Circuit
Notes:
1/ Schottky diode D1 must have maximum peak current rating of at least 1.5A and for best results should have
forward voltage spec of less than 0.5V at 1 Amp.
2/ Inductor L3 must have maximum peak current rating of at least 1.5A and for best results should have DC
resistance of less than 0.5 ohm.
© 2009 Microchip Technology Inc.
DS22159B-page 4
RE46C117
DC to DC Converter and Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Notes
© 2009 Microchip Technology Inc.
DS22159B-page 5
RE46C117
DC to DC Converter and Piezoelectric Horn Driver
Product Specification
Information contained in this publication regarding device
applications and the like is provided only for your convenience and
may be superseded by updates. It is your responsibility to ensure
that your application meets with your specifications. MICROCHIP
MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY
KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL,
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OTHERWISE,
RELATED
TO
THE
INFORMATION, INCLUDING BUT NOT LIMITED TO ITS
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otherwise, under any Microchip intellectual property rights.
R&E International
A Subsidiary of Microchip Technology Inc.
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© 2009, Microchip Technology Incorporated, Printed in the
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Printed on recycled paper.
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© 2009 Microchip Technology Inc.
DS22159B-page 6
