R&E International A Subsidiary of Microchip Technology Inc. RE46C107 DC to DC Converter, Voltage Regulator and Piezoelectric Horn Driver Product Specification Features General Description Low Quiescent Current The RE46C107 is intended for use in 3V or 4.5V 10V Up Converter battery or battery-backed applications. The circuit Low Horn Driver Ron features a DC-to-DC up-converter and driver circuit suitable for driving a piezoelectric horn. A selectable Voltage Regulation to 3.0V or 3.3V 3.0V or 3.3V regulator is also provided for Low Battery Detection microprocessor voltage regulation. An LED driver Available in Standard Packaging or RoHS and low battery detection and signaling are also Compliant Pb Free Packaging available. Pin Configuration Applications 1 16 LBOUT LBST Smoke detectors LBSET 2 15 CO Detectors FEED Personal Security Products VDD 3 14 HRNEN Electronic Toys LEDEN 4 13 HORNS 5 12 LED HORNB 6 11 LX VO 7 10 VSS2 VREG 8 9 VSS REGSEL ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL VALUE UNITS Supply Voltage V 5 V DD V 12 V OUT Input Voltage Range Except REGSEL & FEED V -.3 to V+.3 V in reg REGSEL Input Voltage Range V -.3 to V+.3 V inrs dd FEED Input Voltage Range V -10 to +22 V infd Input Current except FEED I 10 mA in Operating Temperature T 0 to 50 C A Storage Temperature T -55 to 125 STG C Continuous Operating Current I 40 mA O (HornS, HornB, Vreg, VO) 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 R&E International Piezoelectric Horn Driver A Subsidiary of Microchip Technology Inc. Product Specification 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 Connect to the positive supply voltage 4 LEDEN 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. 5 LED Open drain NMOS output used to drive a visible 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 Logic input used to set the Vreg output voltage level. This input should always be tied to either Vdd or Vss. 10 VREG Regulated output voltage. Nominal output is 3.3V for REGSEL=Vdd and 3.0V for REGSEL=Vss. 11 VO Boosted voltage produced by DC-DC converter, typically 4V or 10V. 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. DS22160A-page 2