r&e international a subsidiary of microchip technology inc. re46c107 dc to dc converter, voltage regulator and piezoelectric horn driver product specification ? 2009 microchip technology inc. ds22160a-page 1 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. applications smoke detectors co detectors personal security products electronic toys 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 1 2 3 4 5 6 7 8 lbst lbset vdd leden led lx vss2 vss lbout feed hrnen horns hornb vo vreg regse l 16 15 14 13 12 11 10 9 absolute maximum ratings parameter symbol value units supply voltage v dd v out 5 12 v v input voltage range except regsel & feed v in -.3 to v reg +.3 v regsel input voltage range v inrs -.3 to v dd +.3 v feed input voltage range v infd -10 to +22 v input current except feed i in 10 ma operating temperature t a 0 to 50 c storage temperature t stg -55 to 125 c continuous operating current (horns, hornb, vreg, vo) i o 40 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 protec tion; however proper esd prevention procedures should be used when handling this product. damage can occur when exposed to extremely high static electrical charge
re46c107 dc to dc converter, voltage regulator and r&e international piezoelectric horn driver a subsidiary of microchip technology inc. product specification ? 2009 microchip technology inc. ds22160a-page 2 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 us ed 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 posit ive supply through a low resistance path. 7 vss2 internally connected to the source of t he 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 t he 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 produc ed 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 interf ace 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 electr ode of the piezoelectric horn through a current limiting resistor. if not used, th is 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.
re46c107 dc to dc converter, voltage regulator and r&e international piezoelectric horn driver a subsidiary of microchip technology inc. product specification ? 2009 microchip technology inc. ds22160a-page 3 electrical characteristics limits apply at vdd=3v, vss=vss2=0v, creg=10uf, cvo=10uf, t a =0 c to 50 c, unless otherwise noted. typical values are at t a =27 c. limits parameter symbol test pin test conditions min typ max units supply voltage vdd 3 operating 2.0 5.0 v standby supply current iddstby inputs low; lbset open; no loads; dc-dc running 14 ua quiescent supply current iddq 3 inputs low; lbset open; no loads; vo=5v; vlx=0.5v 7 10.5 ua quiescent ivo ivoq 10 same conditions as above for iddq 4 7.5 ua iil 1, 4, 14 lbst, leden, hrnen inputs vin= vss -100 na iilrs 9 regsel input vin= vss -100 na input leakage low iilf 15 feed=-10v; vo=10v -15 -50 ua iih 1, 4, 14 lbst, leden, hrnen inputs vin=vreg 100 na iihrs 9 regsel input vin=vdd 100 na input leakage high iihf 15 feed=+22v; vo=10v 20 50 ua vil 1, 4, 14 lbst, leden, hrnen inputs 1 v vilrs 9 regsel input 1 v input voltage low vilf 15 feed input; vo=10v 3 v vih 1, 4, 14 lbst, leden, hrnen inputs vreg-.7 v vihrs 9 regsel input 2.3 v input voltage high vihf 15 feed input; vo=10v 7 v vol1 12,13 hornb or horns; iout=16ma; vdd=3v; vo=10v .3 .5 v vol2 5 led; iout=10ma; vo=4v .3 .5 v output low voltage vol3 16 lbout; iout=100ua; vdd=3v .3 .5 v voh1 12,13 hornb or horns; vo=10v; iout=-16ma; hrnen=vreg 9.5 9.7 v output high voltage voh3 16 lbout; iout=100ua; vdd=2.1v vreg-.5 vreg-.3 v vvo1 11 vdd=3v; hrnen=vreg; iout=10ma 8.5 10 11 v vo output voltage vvo2 11 vdd=3v; hrnen=0v; iout=10ma 3.5 4 4.4 v
re46c107 dc to dc converter, voltage regulator and r&e international piezoelectric horn driver a subsidiary of microchip technology inc. product specification ? 2009 microchip technology inc. ds22160a-page 4 electrical characteristics (continued) limits apply at vdd=3v, vss=vss2=0v, creg=10uf, cvo=10uf, t a =0 c to 50 c, unless otherwise noted. typical values are at t a =27 c. limits parameter symbol test pin test conditions min typ max units voeff1 iload= 10ma, vdd=3v; hrnen=0v 85 % vo efficiency voeff2 iload=100ua; vdd=3v; hrnen=0v 75 % low battery threshold vlbat 3 lbst=vreg 2.3 2.4 2.55 v lbst to lbout propagation delay tplhlb 16 vdd=2.1; l bset cload=5pf 10 20 us vreg1 10 iout<20ma; regsel=vdd 3.2 3.3 3.4 v vreg voltage vreg2 10 iout<20ma; regsel=vss 2.9 3.0 3.1 v vregld1 10 iout=0 to 20ma; hrnen=vreg 30 50 mv vreg load regulation vregld2 10 iout=0 to 20ma; hrnen=0v 30 50 mv brownout threshold vobvt 11 falling edge of vo 3.2 3.6 4.0 v vo-to-brownout margin vobvtm 11 vv02 -vobvt 100 400 mv brownout pull down ibt 10 vo=3.0v; vreg=2.0v 20 40 ma vcl1 10 regsel=vdd 3.75 4 4.25 v vreg over voltage clamp vcl2 10 regsel=0v 3.35 3.6 3.85 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 sens itive to series resistance. critical components of this resistance are the inductor dc resistanc e, the internal resistance of the batter y 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 ba ttery. in order to function properly under full load at vdd=2v, the total of the inductor and interconnect resistanc es should not exceed 0.3 ohm. the internal battery resistance should be no more than 0.5 ohm and a low esr c apacitor 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 tabl e, wherever a specific vo value is list ed under test conditions, the vo is forced exte rnally 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 limit s are guard-banded based on temperature characterization to guarante e compliance at temperature extremes.
re46c107 dc to dc converter, voltage regulator and r&e international piezoelectric horn driver a subsidiary of microchip technology inc. product specification ? 2009 microchip technology inc. ds22160a-page 5 truth table - horn/boost logic status lbst hrnen feed hornb horns vo (typ.) low battery disabled; horn disabled 0 0 x 0 0 vvo2 (4v) low battery enabled; horn disabled 1 0 x 0 0 vvo1 (10v) horn enabled x 1 0 1 0 vvo1 (10v) horn enabled x 1 1 0 1 vvo1 (10v)
re46c107 dc to dc converter, voltage regulator and r&e international piezoelectric horn driver a subsidiary of microchip technology inc. product specification ? 2009 microchip technology inc. ds22160a-page 6 functional block diagram
re46c107 dc to dc converter, voltage regulator and r&e international piezoelectric horn driver a subsidiary of microchip technology inc. product specification ? 2009 microchip technology inc. ds22160a-page 7 typical application circuit notes: 1/ schottky diode d1 must have maximum peak current rating of at least 1.5a and fo r best results should have forward voltage sp ec of less than 0.5v at 1 amp. 2/ inductor l1 must have maximum peak current rating of at l east 1.5a and for best results should have dc resistance of less th an 0.3 ohm.
re46c107 dc to dc converter, voltage regulator and r&e international piezoelectric horn driver a subsidiary of microchip technology inc. product specification ? 2009 microchip technology inc. ds22160a-page 8 information contained in this publication regarding device applications and the like is prov ided 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 licens es are conveyed, implicitly or otherwise, under any microchip intellectual property rights. trademarks the microchip name and logo, t he microchip logo, accuron, dspic, k ee l oq , k ee l oq 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 acti ve 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, app lication 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, picdem.net, pictail, pic 32 logo, powercal, powerinfo, 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 micr ochip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2009, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. microchip received iso/ts-16949:2002 ce rtification 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 ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolat ile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified.
re46c107 dc to dc converter, voltage regulator and r&e international piezoelectric horn driver a subsidiary of microchip technology inc. product specification ? 2009 microchip technology inc. ds22160a-page 9
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