R&E International A Subsidiary of Microchip Technology Inc. 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 1 16 LBOUT LBSET 2 15 FEED VDD 3 14 HRNEN LEDEN 4 13 HORNS LED 5 12 HORNB LX 6 11 VO VSS2 7 10 VREG VSS 8 9 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 © 2009 Microchip Technology Inc. DS22160A-page 1 RE46C107 DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International A Subsidiary of Microchip Technology Inc. PIN DESCRIPTIONS PIN# PIN NAME DESCRIPTION 1 LBST Logic input used to activate low battery detection circuitry. This includes activating high boost mode. 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. 2 LBSET 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. 3 VDD 4 LEDEN 5 LED 6 LX 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. 7 VSS2 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. 8 VSS Connect to the negative supply voltage. 9 REGSEL 10 VREG 11 VO 12 HORNB This pin is connected to the metal electrode (B) of a piezoelectric transducer. 13 HORNS HS is a complementary output to HB and connects to the ceramic electrode (S) of the piezoelectric transducer. 14 HRNEN 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. 15 FEED 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. 16 LBOUT Logic output used to signal a low battery condition. Output pulls to Vreg when LBST is high and a low battery condition is detected. © 2009 Microchip Technology Inc. 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. 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. DS22160A-page 2 RE46C107 DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International A Subsidiary of Microchip Technology Inc. Electrical Characteristics Limits apply at Vdd=3V, Vss=Vss2=0V, Creg=10uF, Cvo=10uF, TA=0°C to 50°C, unless otherwise noted. Typical values are at TA=27°C. Parameter Symbol Test Pin Supply Voltage Standby Supply Current Vdd 3 Iddstby Test Conditions Operating Iddq 3 Quiescent Ivo Ivoq 10 Iil 1, 4, 14 Iilrs 9 Iilf 15 Iih 1, 4, 14 Iihrs 9 Iihf Vil 15 1, 4, 14 Vilrs 9 REGSEL Input FEED Input; VO=10V Input Leakage High Input Voltage Low Input Voltage High Output Low Voltage Output High Voltage Vilf 15 Vih 1, 4, 14 Vihrs 9 REGSEL Input Vihf 15 Vol1 12,13 Vol2 Vol3 5 16 Voh1 12,13 Voh3 16 Vvo1 11 Vvo2 11 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 VO Output Voltage © 2009 Microchip Technology Inc. LBST, LEDEN, HRNEN Inputs Limits Typ 2.0 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 Quiescent Supply Current Input Leakage Low Min Max Units 5.0 V 14 uA 7 10.5 uA 4 7.5 uA -100 nA -100 nA -50 uA 100 nA 100 nA 50 1 uA V 1 V 3 V -15 20 Vreg-.7 V 2.3 V 7 V .3 .5 V .3 .3 .5 .5 V V 9.5 9.7 V Vreg-.5 Vreg-.3 V 8.5 10 11 V 3.5 4 4.4 V DS22160A-page 3 RE46C107 DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International A Subsidiary of Microchip Technology Inc. Electrical Characteristics (continued) Limits apply at Vdd=3V, Vss=Vss2=0V, Creg=10uF, Cvo=10uF, TA=0°C to 50°C, unless otherwise noted. Typical values are at TA=27°C. Parameter Symbol Test Pin VO Efficiency Voeff2 Vlbat 3 LBST=Vreg Tplhlb 16 Vdd=2.1; LBSET Cload=5pF Vreg1 10 Vreg2 10 Vregld1 10 Vregld2 10 Brownout Threshold VO-to-Brownout Margin Brownout Pull down VREG over voltage clamp Vobvt 11 Falling edge of VO Vobvtm 11 Ibt Vcl1 Vcl2 Max Units 85 % 75 % 2.55 V 10 20 us 3.2 3.3 3.4 V 2.9 3.0 3.1 V 30 50 mV 30 50 mV 3.2 3.6 4.0 V Vv02 -Vobvt 100 400 mV 10 VO=3.0V; Vreg=2.0V 20 40 mA 10 10 REGSEL=Vdd REGSEL=0V 3.75 3.35 4 3.6 Iout<20mA; REGSEL=Vdd Iout<20mA; REGSEL=Vss 2.3 Limits Typ 2.4 VREG Voltage VREG Load Regulation Min Iload= 10mA, Vdd=3V; HRNEN=0V Iload=100uA; Vdd=3V; HRNEN=0V Voeff1 Low Battery Threshold LBST to LBOUT Propagation Delay Test Conditions Iout=0 to 20mA; HRNEN=Vreg Iout=0 to 20mA; HRNEN=0V 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. © 2009 Microchip Technology Inc. DS22160A-page 4 RE46C107 DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International A Subsidiary of Microchip Technology Inc. Truth Table - Horn/Boost Logic Status Low Battery Disabled; Horn Disabled Low Battery Enabled; Horn Disabled Horn Enabled Horn Enabled © 2009 Microchip Technology Inc. LBST HRNEN FEED HORNB HORNS VO (Typ.) 0 0 X 0 0 Vvo2 (4V) 1 0 X 0 0 Vvo1 (10V) X 1 0 1 0 Vvo1 (10V) X 1 1 0 1 Vvo1 (10V) DS22160A-page 5 RE46C107 DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification R&E International A Subsidiary of Microchip Technology Inc. Functional Block Diagram © 2009 Microchip Technology Inc. DS22160A-page 6 RE46C107 DC to DC Converter, Voltage Regulator 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 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. © 2009 Microchip Technology Inc. DS22160A-page 7 RE46C107 DC to DC Converter, Voltage Regulator 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 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. 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The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® 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. DS22160A-page 8 RE46C107 DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification © 2009 Microchip Technology Inc. R&E International A Subsidiary of Microchip Technology Inc. DS22160A-page 9