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R&E International
A Subsidiary of Microchip Technology Inc.
RE46C109
Voltage Regulator, Voltage Converter and Piezoelectric Horn Driver
Product Specification
General Description
The RE46C109 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.
Features
* * * * * * * * * Low Quiescent Current 12V Boost Regulator Low Horn Driver Ron 3V Regulator, Other Options Available Low Battery Detection Interface Power Good and Brownout Circuits Device interconnection Available in DIP and SOIC packages
Available in Standard Packaging or RoHS Compliant Pb Free Packaging
Pin Configuration
VDD 1 16 VPOS CAP+ CAPVREG LBAT HORNB HORNS FEED
Applications
Smoke detectors CO Detectors Personal Security Products Electronic Games Hand Held Instruments
IO1 IODIR IO2 LBST PG HRNEN VSS
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
VDD Vin Vinfd Vio2 Vio1 Iin TA Icon TSTG TJ
VALUE
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
UNITS
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.
(c) 2009 Microchip Technology Inc.
DS22168A-page 1
RE46C109
Voltage Regulator, Voltage Converter and Piezoelectric Horn Driver Product Specification R&E International
A Subsidiary of Microchip Technology Inc.
Electrical Characteristics at TA=27C, Vdd=9V, Vss=0V (unless otherwise noted).
Parameter
Supply Voltage Quiescent Supply Current Supply Current
Symbol
Vdd Idd1 Idd2 Iin Operating
Conditions
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 PG = 5.0v All Inputs except FEED
Limits
MIN 6 4.7 350 -100 20 -50 -15 1.0 1 100 50 TYP MAX 12 6.5 UNITS V uA uA nA uA uA uA V
Input Leakage
Iihf Iilf
Output Leakage Input Voltage Low
Iout Vil
Input Voltage High
Output Low Voltage
Vih
Vol1 Vol2 Vol3
All Inputs Except FEED
HORNB or HORNS; Iout=16mA; IO2, Iout=100uA; IODIR=Vil , IO1=Vil PG, Iout=5.0mA; HORNB or HORNS; Iout=-16mA IO2, Iout=-100uA; IODIR=Vil , IO1=Vih VPOS; Iout=-16mA; HRNEN=VDD VPOS; Iout=-16mA, C1=1uF C2=10uF; Vdd=6.5v VPOS; No Loads, C1=1uF C2=10uF; Vdd=6.0v LBAT; LBST=Vdd VREG; Iout<50mA; HRNEN=VSS VREG; Vdd=6V to 12V; VREG Iout=10mA; HRNEN = VSS; Note 3 VREG; Iout=0 to -50mA; HRNEN=VSS; Note 3 Falling Edge of VDD; Note 1 Vdd=4.5V, Vreg=2v
2.3
.3 .3 .5 Vpos-.5 Vreg -.5 10.7 Vpos-.3 Vreg -.3 11.8 150 85 95
.17 *Vdd
V
.5 .5 V V V V V 12.7 V kHz % %
.23*Vdd
Output High Voltage VPOS RMS Output Voltage Charge pump Oscillator Frequncy Charge pump Power Efficiency Charge pump Voltage Efficiency Low Battery Interface VREG Voltage VREG Line Regulation VREG Load Regulation Brownout Threshold Brownout Pull Down Current
Voh1 Voh2 Vvpos CPf CPpe CPve Lbv Vreg Vregln Vregld Vbvt Ibt
99
.2*Vdd
V V mV mV V mA
2.85
3
3.15 50 90
4.5 15
5.0 25
5.5
(c) 2009 Microchip Technology Inc.
DS22168A-page 2
RE46C109
Voltage Regulator, Voltage Converter and Piezoelectric Horn Driver Product Specification R&E International
A Subsidiary of Microchip Technology Inc.
Electrical Characteristics at TA=27C, Vdd=9V, Vss=0V (unless otherwise noted).
Parameter
VREG Over Voltage Clamp VREG Over Voltage Clamp Current PG Trip Threshold PG Delay
Symbol
Vcl Icl PGvtr PGvtf PGtdly IO1ih1 IO1ih2
Conditions
Iout>1mA; Note 2 VREGVcl Vreg output rising Vreg output falling Delay time with respect to PGvtr IODIR=Vil, IO1=Vdd-2V, Vdd=12V 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 IODIR=Vil
Limits
MIN 3.7 0.5 77 72 25 84 80 500 60 150 -4 -16 10 3 1.5 15 94 88 TYP 4.0 MAX 4.3 UNITS V mA %Vreg %Vreg usec UA UA mA mA mA V V
IO1 Output Current
IO1ioh1 IO1ioh2 IO1iol1
IO1 Alarm Voltage
IO1vih IO1vil
Unless noted the limits at room temperature are guaranteed and 100% production tested. Limits over temperature are guaranteed but not 100% tested. Note 1: The brown-out threshold voltage is the Vdd voltage at which the regulator will be disabled and VREG (output) will be pulled to Vss. 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 IO2 (pin 4) Input Output 0 1 0 1 IO1 (pin 2) Input Output 0 1 0 1
(c) 2009 Microchip Technology Inc.
DS22168A-page 3
RE46C109
Voltage Regulator, Voltage Converter and Piezoelectric Horn Driver Product Specification R&E International
A Subsidiary of Microchip Technology Inc.
Functional Block Diagram
(c) 2009 Microchip Technology Inc.
DS22168A-page 4
RE46C109
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 RE46C109 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 a 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. 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.
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.
(c) 2009 Microchip Technology Inc.
DS22168A-page 5
RE46C109
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 RE46C109 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.
(c) 2009 Microchip Technology Inc.
DS22168A-page 6
RE46C109
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
(c) 2009 Microchip Technology Inc.
DS22168A-page 7
RE46C109
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 RE46C109 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.
(c) 2009 Microchip Technology Inc.
DS22168A-page 8
RE46C109
Voltage Regulator, Voltage Converter and Piezoelectric Horn Driver Product Specification
Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, KEELOQ 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, 32 logo, PowerCal, PowerInfo, PICDEM.net, PICtail, PIC 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. (c) 2009, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper.
R&E International
A Subsidiary of Microchip Technology Inc.
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 CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.
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(R) MCUs and dsPIC(R) DSCs, KEELOQ(R) 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.
(c) 2009 Microchip Technology Inc.
DS22168A-page 9

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