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R&E International
RE46C107
DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification
General Description
The RE46C107 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. A selectable 3.0V or 3.3V regulator is also provided for microprocessor voltage regulation. An LED driver and low battery detection and signaling are also available.
Features
* * * * * * Low Quiescent Current 10V Up Converter Low Horn Driver Ron Voltage Regulation to 3.0V or 3.3V Low Battery Detection
Available in Standard Packaging or RoHS Compliant Pb Free Packaging
Pin Configuration Applications
Smoke detectors CO Detectors Personal Security Products Electronic Toys
LBST LBSET VDD LEDEN LED LX VSS2 VSS
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
LBOUT FEED HRNEN HORNS HORNB VO VREG REGSEL
ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage Input Voltage Range Except REGSEL & FEED REGSEL Input Voltage Range FEED Input Voltage Range Input Current except FEED Operating Temperature Storage Temperature Continuous Operating Current (HornS, HornB, Vreg, VO) SYMBOL VDD VOUT Vin Vinrs Vinfd Iin TA TSTG IO VALUE 5 12 -.3 to Vreg +.3 -.3 to Vdd +.3 -10 to +22 10 0 to 50 -55 to 125 40 UNITS V 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
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RE46C107
DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International
PIN DESCRIPTIONS
PIN# 1 PIN NAME LBST DESCRIPTION Logic input used to activate low battery detection circuitry. Input is designed to interface with circuitry supplied by Vreg, so input voltage levels will scale with the Vreg voltage. Input is disabled during brown-out. Internally connected to the low battery comparator input used to sense the Vdd voltage divider. The internal reference to which this node is compared is nominally 0.9V. Nominal internal resistance to Vdd is 400kohm. Nominal resistance to Vss is 240kohm. The resistance to Vss is changed to a nominal of 220kohm once a low battery condition is detected. External resistances can be added in parallel to adjust the low battery threshold voltage. Connect to the positive supply voltage Logic input used to enable the LED driver. Input is designed to interface with circuitry supplied by Vreg, so input voltage levels will scale with the Vreg voltage. LED driver is disabled during brown-out. Open drain NMOS output used to drive a visible LED. Open drain NMOS output used to drive the boost converter inductor. The inductor should be connected from this pin to the positive supply through a low resistance path. Internally connected to the source of the NMOS device used to drive the boost converter inductor. Connect to the negative supply voltage through a low resistance path. Connect to the negative supply voltage. Logic input used to set the Vreg output voltage level. This input should always be tied to either Vdd or Vss. Regulated output voltage. Nominal output is 3.3V for REGSEL=Vdd and 3.0V for REGSEL=Vss. Boosted voltage produced by DC-DC converter, typically 4V or 10V. This pin is connected to the metal electrode (B) of a piezoelectric transducer. HS is a complementary output to HB and connects to the ceramic electrode (S) of the piezoelectric transducer. Logic input for horn enable designed to interface with circuitry supplied by Vreg. Input voltage levels will scale with the Vreg voltage. Horn is disabled during brown-out. Usually connected to the feedback electrode of the piezoelectric horn through a current limiting resistor. If not used, this pin must be connected to Vss. Logic output used to signal a low battery condition. Output pulls to Vreg when LBST is high and a low battery condition is detected.
2
LBSET
3 4
VDD LEDEN
5 6 7 8 9 10 11 12 13 14 15 16
LED LX VSS2 VSS REGSEL VREG VO HORNB HORNS HRNEN FEED LBOUT
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RE46C107
DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International
Electrical Characteristics
Limits apply at Vdd=3V, Vss=Vss2=0V, Creg=10uF, Cvo=10uF, TA=0C to 50C, unless otherwise noted. Typical values are at TA=27C.
Parameter
Supply Voltage Standby Supply Current Quiescent Supply Current Quiescent Ivo
Symbol
Vdd Iddstby Iddq Ivoq Iil
Test Pin
3
Test Conditions
Operating Inputs low; LBSET open; No loads; DC-DC Running Inputs low; LBSET open; No loads; VO=5V; Vlx=0.5V Same conditions as above for Iddq LBST, LEDEN, HRNEN Inputs Vin= VSS REGSEL Input Vin= Vss FEED=-10V; VO=10V LBST, LEDEN, HRNEN Inputs Vin=Vreg REGSEL Input Vin=Vdd FEED=+22V; VO=10V LBST, LEDEN, HRNEN Inputs REGSEL Input FEED Input; VO=10V LBST, LEDEN, HRNEN Inputs REGSEL Input FEED Input; VO=10V HORNB or HORNS; Iout=16mA; Vdd=3V; VO=10V LED; Iout=10mA; VO=4V LBOUT; Iout=100uA; Vdd=3V HORNB or HORNS; VO=10V; Iout=-16mA; HRNEN=Vreg LBOUT; Iout=100uA; Vdd=2.1V Vdd=3V; HRNEN=Vreg; Iout=10mA Vdd=3V; HRNEN=0V; Iout=10mA
Min
2.0
Limits Typ
20 7 9
Max
5.0
Units
V uA uA uA
3 10 1, 4, 14 9 15 1, 4, 14 9 15 1, 4, 14 9 15 1, 4, 14 9 15 12,13 5 16 12,13 16 11 11
-100 -100 -15 -50 100 100 20 50 1 1 3 Vreg-.7 2.3 7 .3 .3 .3 9.5
Vreg-.5
nA nA uA nA nA uA V V V V V V
Input Leakage Low Iilrs Iilf Iih Input Leakage High Iihrs Iihf Vil Input Voltage Low Vilrs Vilf Vih Input Voltage High Vihrs Vihf Output Low Voltage Output High Voltage Vol1 Vol2 Vol3 Voh1 Voh3 Vvo1 VO Output Voltage Vvo2
.5 .5 .5
V V V V V V V
9.7
Vreg-.3
10 4
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RE46C107
DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International
Electrical Characteristics (continued)
Limits apply at Vdd=3V, Vss=Vss2=0V, Creg=10uF, Cvo=10uF, TA=0C to 50C, unless otherwise noted. Typical values are at TA=27C.
Parameter
VO Efficiency
Symbol
Voeff1 Voeff2
Test Pin
Test Conditions
Iload= 10mA, Vdd=3V; HRNEN=0V Iload=100uA; Vdd=3V; HRNEN=0V
Min
Limits Typ
85 75 2.4 30
Max
Units
% % V us
Low Battery Threshold LBST to LBOUT Propagation Delay VREG Voltage
Vlbat Tplhlb Vreg1 Vreg2
3 16 10 10 10 10 11 11 10 10 10
LBST=Vreg Vdd=2.1; LBSET Cload=5pF Iout<20mA; REGSEL=Vdd Iout<20mA; REGSEL=Vss Iout=0 to 20mA; HRNEN=Vreg Iout=0 to 20mA; HRNEN=0V Falling edge of VO Vv02 -Vobvt VO=3.0V; Vreg=2.0V REGSEL=Vdd REGSEL=0V 100 20 3.75 3.35 3.1 2.8
3.3 3.0 50 50 3.6 400 40 4 3.6
3.5 3.2
V V mV mV V mV mA
VREG Load Regulation Brownout Threshold VO-to-Brownout Margin Brownout Pull down VREG over voltage clamp
Vregld1 Vregld2 Vobvt Vobvtm Ibt Vcl1 Vcl2
4.25 3.85
V V
Notes on Electrical Characteristics: 1/ DC-DC converter in high boost mode (nominal 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 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 draw 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 regulator and horn will be disabled. At VO voltages below the brown-out threshold Vreg will be pulled to Vss. 4/ 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 Vreg when it is pulled up by an external source. 5/ The limits shown are 100% tested at 25C only. Test limits are guard-banded based on temperature characterization to guarantee compliance at temperature extremes.
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RE46C107
DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International
Functional Block Diagram
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RE46C107
DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International
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 L1 must have maximum peak current rating of at least 1.5A and for best results should have DC resistance of less than 0.3 ohm.
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RE46C107
DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International
R&E INTERNATIONAL, Inc. reserves the right to make changes without further notice to any products herein to improve reliability, function or design. R&E INTERNATIONAL, Inc. does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. R&E INTERNATIONAL, Inc. products are not authorized for use as critical components in life support devices or systems without the express written approval of the President of R&E INTERNATIONAL, Inc. Life support devices or systems are devices or systems which are intended for surgical implant into the body to support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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