R&E International
A Subsidiary of Microchip Technology Inc.
RE46C119
Voltage Regulator, Voltage Converter and Piezoelectric Horn Driver
Product Specification
General Description
Features
The RE46C119 is intended for use in applications
where low voltage regulation and a high voltage
horn driver are required. The circuit features a
voltage boost converter/regulator and driver circuit
suitable for driving a piezoelectric horn. The horn
enable pin activates the boost converter and horn
driver circuit. Supply current is 6.5uA maximum
when the boost regulator and horn driver are not in
use. A 3V regulator is also provided for
microprocessor voltage regulation. Low battery
detection and signaling are also available.
Interconnect pins are provided to allow
communication in multiple unit environments. A
power good pin monitors the status of the regulator
output.
•
•
•
•
•
•
•
•
•
Low Quiescent Current
12V Boost Regulator
Low Horn Driver Ron
3V Regulator, Other Options Available
Low Battery Detection Interface
Power Good Circuit
Device interconnection
Available in DIP and SOIC packages
Available in Standard Packaging or RoHS
Compliant Pb Free Packaging
Pin Configuration
VDD
1
16
VPOS
Applications
IO1
CAP+
Smoke detectors
CO Detectors
Personal Security Products
Electronic Games
Hand Held Instruments
IODIR
CAP-
IO2
VREG
LBST
LBAT
PG
HORNB
HRNEN
HORNS
VSS
FEED
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Supply Voltage
Input Voltage Range Except FEED, IO1, IO2
FEED Input Voltage Range
IO2 Input Voltage Range
IO1 (as input) Voltage Range
Input Current except FEED
Operating Temperature
Continuous Operating Current (Horn or VPOS)
Storage Temperature
Maximum Junction Temperature
SYMBOL
VALUE
UNITS
VDD
Vin
Vinfd
Vio2
Vio1
Iin
TA
Icon
TSTG
TJ
12
-.3 to Vdd +.3
-10 to +22
-.3 to VREG+.3
-.3 to Vdd + 6
10
-40 to 85
50
-55 to 125
125
V
V
V
V
V
mA
°C
mA
°C
°C
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.
DS22169A-page 1
RE46C119
Voltage Regulator, Voltage Converter and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Electrical Characteristics at TA=27°C, Vdd=9V, Vss=0V (unless otherwise noted).
Parameter
Supply Voltage
Quiescent Supply
Current
Supply Current
Symbol
Vdd
Idd1
Idd2
Iin
Input Leakage
Iihf
Iilf
Conditions
Operating
HRNEN, LBST, IODIR, FEED,
REGSEL=VSS, No Loads
LBST, IODIR, FEED =VSS
HRNEN=VDD, No Loads
All Inputs except FEED, Vin=VDD
or VSS
FEED=+22V
FEED=-10V
Output Leakage
Iout
PG = 5.0v
Input Voltage Low
Vil
All Inputs except FEED
Input Voltage
High
Vih
All Inputs Except FEED
Vol1
HORNB or HORNS; Iout=16mA;
IO2, Iout=100uA;
IODIR=Vil , IO1=Vil
PG, Iout=5.0mA;
Output Low Voltage
Vol2
Vol3
Output High
Voltage
VPOS RMS Output
Voltage
Charge pump
Oscillator
Frequency
Charge pump
Power Efficiency
Charge pump
Voltage Efficiency
Low Battery
Interface
VREG Voltage
VREG Line
Regulation
VREG Load
Regulation
Voh1
Voh2
Vvpos
HORNB or HORNS; Iout=-16mA
IO2, Iout=-100uA;
IODIR=Vil , IO1=Vih
VPOS; Iout=-16mA;
HRNEN=VDD
Limits
MIN
6
4.7
CPve
VPOS; Iout=-16mA, C1=1uF
C2=10uF; Vdd=6.5v
VPOS; No Loads, C1=1uF
C2=10uF; Vdd=6.0v
Lbv
LBAT; LBST=Vdd
Vreg
VREG; Iout1mA; Note 2
3.7
Icl
VREG≥Vcl
0.5
PGvtr
Vreg output rising
77
84
94
%Vreg
PGvtf
Vreg output falling
72
80
88
%Vreg
PGtdly
Delay time with respect to PGvtr
IO1ih1
IODIR=Vil, IO1=Vdd-2V, Vdd=12V
IO1ih2
IO1vih
IODIR=Vil, IO1=17V, Vdd=12V
IODIR, IO2=Vih, Vdd=6.5V,
IO1=4.5V
IODIR, IO2=Vih, Vdd=12V,
IO1=Vss
IO dump current
IODIR= Vih, IO2=Vil, IO1=1V
IODIR=Vil
IO1vil
IODIR=Vil
IO1ioh1
IO1ioh2
IO1iol1
IO1 Alarm Voltage
Limits
Conditions
mA
500
25
usec
60
UA
150
UA
-4
mA
-16
10
15
mA
mA
3
V
1.5
V
Unless noted the limits at room temperature are guaranteed and 100% production tested. Limits over temperature are guaranteed but not
100% tested.
Note 2: In normal operation, the regulator will provide high-side current of up to 50mA, but current sinking capability is typically under 1uA. The
overvoltage clamp, Vcl is intended to limit the voltage at VREG (output) when it is pulled up by an external source.
Note 3: Not 100% production tested but limits are guaranteed by design.
Interconnect Logic Truth Table
IODIR
(pin 3)
1
1
0
0
© 2009 Microchip Technology Inc.
IO2 (pin 4)
Input
Output
0
1
0
1
IO1 (pin 2)
Input
Output
0
1
0
1
DS22169A-page 3
RE46C119
Voltage Regulator, Voltage Converter and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Functional Block Diagram
© 2009 Microchip Technology Inc.
DS22169A-page 4
RE46C119
Voltage Regulator, Voltage Converter and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
PIN DESCRIPTIONS
VDD (Pin 1, Input) - Connect to the positive
terminal of the supply voltage for the voltage
regulator, charge pump voltage converter
and bi-directional Interconnect block.
IO1 (Pin 2, Input/Output) - This bi-directional
pin provides an interface to additional
RE46C119 IO1 pins. This serves as a
communication link between separate
modules.
IODIR (Pin 3, Input) - This input provides
control for the bi-directional pins IO1 and
IO2.
IO2 (Pin 4, Input/Output) - This bi-directional
pin provides an interface to a TTL/CMOS I/O
of an uP or ASIC. Refer to the interconnect
logic truth table.
LBST (Pin 5, Input) - This input provides an
enable or strobe control for the analog low
battery detection function.
PG (Pin 6, Output) - This open drain NMOS
output provides a status indication of when
the VREG output is above or below a
specified voltage level.
HORNS (Pin10, Output) - Horn output driver
which provides VPOS to VSS output voltage
swing for the piezoelectric horn.
HORNB (Pin11, Output) - Horn output driver
which provides VPOS to VSS output voltage
swing for the piezoelectric horn.
LBAT (Pin12, Output) - Analog output
voltage that is proportional to the VDD
supply and functions as a low battery
detection output.
VREG (Pin13, Output) - Voltage regulator
output, requires an external capacitor.
VCAP- (Pin14, I/O) - Negative terminal for
the external charge pump boost (fly)
capacitor.
VCAP+ (Pin 15, I/O) - Positive terminal for
the external charge pump boost (fly)
capacitor.
VPOS (Pin 16, Output) - This output pin
requires an external filter capacitor which
supplies voltage for the horn driver outputs.
HRNEN (Pin 7, Input) - This input provides
activation control for the charge pump boost
regulator and horn driver outputs.
VSS (Pin 8, Input) - This power pin is
connected to the negative terminal of the
supply voltage.
FEEDBACK (Pin9, Input) - Horn driver
input.
© 2009 Microchip Technology Inc.
DS22169A-page 5
RE46C119
Voltage Regulator, Voltage Converter and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Device Operation
(Please refer to the functional block diagram)
The RE46C119 consists of the following main functional blocks: band gap voltage reference, low drop-out voltage
regulator (with over voltage clamp and power supply brownout protection), low battery detection, switched
capacitor 12 volt boost regulator, horn driver and Interconnect logic.
When power is applied the band gap voltage reference and the voltage regulator output are initially enabled. The
low battery detection, horn driver outputs and switched capacitor 12v boost regulator are enabled by TTL
compatible positive logic control inputs.
When the HRNEN (Horn Enable) input is brought to a logic high level, the horn driver outputs as well as the 12v
boost regulator become active. The 12v boost regulator supplies the horn driver outputs. The 12v boost regulator
utilizes a charge pump to boost the Vdd supply input to a regulated 12-volt output. The charge pump consists of
an internal oscillator that is controlled in a voltage comparator feedback configuration.
The low battery detection is enabled and strobed when the LBST input is brought to a logic high level. The LBAT
output is a voltage follower amplifier whose input is determined by a resistor divider across the device supply rails.
© 2009 Microchip Technology Inc.
DS22169A-page 6
RE46C119
Voltage Regulator, Voltage Converter and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Typical Application Circuit
Application Notes:
(See application circuit)
The efficiency of the switched capacitor charge pump regulator varies with the applied input voltage and the load
current. The approximate voltage efficiency is given by:
Efficiency (%) = [VPOS/(2xVDD)]x100
© 2009 Microchip Technology Inc.
DS22169A-page 7
RE46C119
Voltage Regulator, Voltage Converter and
Piezoelectric Horn Driver
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Application Notes continued:
(See application circuit)
Capacitor Selection:
To achieve minimum output voltage ripple, the output capacitor C4 (for VPOS) should have a low ESR (Effective
Series Resistance) value with leads kept as short as possible. Capacitors with long leads increase ripple voltage
due to lead inductance.
Like all Low-Dropout Regulators, the RE46C119 requires an output capacitor connected between VREG (output)
and VSS to stabilize the internal control loop. The recommended capacitance is 10uF. Capacitor values larger
than 10uF are acceptable.
PCB Layout Suggestions:
Due to large transient currents flow in the VDD, VPOS and VSS terminals, minimizing both input and output ripple is
accomplished by placing capacitors as close as possible to the regulator using short direct circuit wiring or traces.
© 2009 Microchip Technology Inc.
DS22169A-page 8
RE46C119
Voltage Regulator, Voltage 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,
STATUTORY OR OTHERWISE,
RELATED
TO
THE
INFORMATION, INCLUDING BUT NOT LIMITED TO ITS
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R&E International
A Subsidiary of Microchip Technology Inc.
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© 2009, Microchip Technology Incorporated, Printed in the
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© 2009 Microchip Technology Inc.
DS22169A-page 9
