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| ? 2013 microchip technology inc. ds20005208a-page 1 mcp1643 features 1.6a typical peak input current limit up to 550 ma led load current low start-up voltage: 0.65v (typical, 25 ma led current) low operating input voltage: down to 0.5v maximum input voltage < v led <5.0v maximum output voltage: -5.0v - overvoltage protection low reference voltage: -v fb = 120 mv - minimal power loss on sense resistor pulse-width modulation mode operation (1 mhz) internal synchronous rectifier internal compensation inrush current limiting internal soft-start (240 s typical) shutdown (en = gnd): - true load disconnect - dimming control by variable duty cycle shutdown current: 1.2 a (typical) overtemperature protection packages: - msop-8 - 2x3 dfn-8 applications one and two cell alkaline and nimh/nicd portable led lighting products led flashlight and head lamps rechargeable flashlights wall led lamps with motion detectors led supply for backlights general led constant current applications description mcp1643 is a compact, high-efficiency, fixed frequency, synchronous step-up converter optimized to drive one led with constant current, that operates from one and two-cell alkaline and nimh/nicd batteries. the device can also drive two red/green/yellow series connection leds. low-voltage technology allows the regulator to start up without high-output voltage and load-current overshoot from a low 0.65v input. high efficiency is accomplished by integrating the low resistance n-channel boost switch and synchronous p-channel switch. all compensation and protection circuitry are integrated to minimize external components. the internal feedback (v fb ) voltage is set to 120 mv for low power dissipation when sensing and regulating led current. a single resistor sets the constant current output that drives the led load. the device features an output overvoltage protection that limits the output voltage to 5.0v typical, in case the led fails or output load is disconnected. the led will either be turned off or turned on using the enable input. a true output load disconnect mode provides input-to-output isolation while shutdown (en = gnd) by removing the normal boost regulator diode path from input to output. shutdown state consumes 1.2 a from input at room temperature. the led can be turned on and off with a variable duty cycle pulse-width modulation (pwm) signal applied to the en pin for dimming applications. the device also features a thermal shutdown at +150c, with +25c hysteresis. two package options, msop-8 and 2x3 dfn-8, are available. package types mcp1643 2x3 dfn* nc v fb v out s gnd p gnd 1 2 3 4 8 7 6 5 sw v in en ep 9 6 1 2 3 8 v in p gnd en v fb nc 7 s gnd mcp1643 msop-8 5 4 sw v out * includes exposed thermal pad (ep), see table 3-1 . 1 mhz low start-up voltage synchronous boost led constant current regulator downloaded from: http:///
mcp1643 ds20005208a-page 2 ? 2013 microchip technology inc. typical applications 10 100 1000 0.1 1 10 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 led current (ma ) r set ( ) input voltage (v) r set for i led min i led min i led max r set for i led max t a = +25 o c v in gnd v fb c out 4.7 f c in 4.7...10 f l 1 4.7 h sw led 4.7 ? en v out + - alkaline on off mcp1643 i led =25ma r set v in gnd v fb c out 20 f c in 4.7...10 f l 1 4.7 h sw white led 0.33 ? en v out + - nimh 1.2v on/off mcp1643 i led =360ma r set + - nimh 1.2v 1m ? r en i led 0.12v r set ---------------- - = r set minimum and maximum limits for i led in regulation, with 6% tolerance white led i led max i led min downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 3 mcp1643 1.0 electrical characteristics absolute maximum ratings ? en, fb, v in, v sw , v out - gnd ........................... +6.5v en, fb ......... < maximum v out or v in >(gndC0.3v) output short circuit current....................... continuous power dissipation ............................ internally limited storage temperature ......................... -65c to +150c ambient temp. with power applied...... -40c to +85c operating junction temperature........ -40c to +125c esd protection on all pins: hbm .............................................................. 4 kv mm................................................................ 300v ? notice: stresses above those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. exposure to maximum rating conditions for extended periods may affect device reliability. dc characteristics electrical characteristics: unless otherwise indicated, v in = en = 1.2v, c out =20f, c in = 10 f, l = 4.7 h, i led =25ma, t a =+25c. boldface specifications apply over the t a range of -40c to +85c. parameters sym min typ max units conditions input characteristics minimum input voltage after start-up v in 0 . 5 v note 1 , note 3 start-up voltage v in 0 . 6 5 0 . 8 v note 2 , note 1 output overvoltage protection v out_ovp 5 . 0 v note 3 shutdown quiescent current i qshdn 1 . 2 ae n = g n d ; includes n-channel and p-channel switch leakage feedback voltage v fb 105 120 135 mv feedback input bias current i vfb 6 0 p a nmos switch leakage i nlk 0 . 4 av in =v sw =4.0v v out =4.5v v en =v fb =gnd pmos switch leakage i plk 0 . 2 5 av in =vs w = gnd; v out =4.5v nmos switch on resistance r ds(on)n 0 . 2 ? i led = 250 ma, note 3 pmos switch on resistance r ds(on)p 0 . 4 ? i led = 250 ma, note 3 nmos peak switch current limit i n(max) 1 . 6 a note 3 maximum duty cycle dc max 9 0 % note 3 minimum duty cycle dc min 5 % note 3 switching frequency f sw 0.85 1.0 1.15 mhz en input logic high v ih 75 %of v in i led =25ma en input logic low v il 2 0% o f v in i led =25ma note 1: for v in mcp1643 ds20005208a-page 6 ? 2013 microchip technology inc. note: unless otherwise indicated, v in =en=1.2v, c out =20f, c in = 10 f, l = 4.7 h, i led =25ma, t a =+25c, msop-8 package. figure 2-7: one white i led vs. ambient temperature. figure 2-8: i led vs. v en duty cycle. figure 2-9: duty cycle vs. ambient temperature. figure 2-10: maximum i led vs. v in . figure 2-11: f sw vs. ambient temperature. figure 2-12: v fb vs. ambient temperature. 0 50 100 150 200 250 300 350 -40 -25 -10 5 20 35 50 65 80 led current (ma) ambient temperature (c) r set = 5 r set = 1.2 r set = 0.82 r set = 0.41 v in = 1.5v 0 25 50 75 100 125 150 0 102030405060708090100 led current (ma) duty cycle (%) r set = 0.82 v in = 1.5v f en = 400 hz f en = 1 khz 34 35 36 37 38 39 40 -40 -25 -10 5 20 35 50 65 80 duty cycle (%) ambient temperature (c) r set = 1.2 (i led = 100 ma) 0 100 200 300 400 500 600 700 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 led current (ma) input voltage (v) t a = +85 o c t a = +25 o c t a = 0 o c 980 985 990 995 1000 1005 1010 -40 -25 -10 5 20 35 50 65 80 switching frequency (khz) ambient temperature (c) i led = 100 ma 117 118 119 120 121 122 123 -40 -25 -10 5 20 35 50 65 80 feadback voltage (mv) ambient temperature (c) i led = 100 ma downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 7 mcp1643 note: unless otherwise indicated, v in =en=1.2v, c out =20f, c in = 10 f, l = 4.7 h, i led =25ma, t a =+25c, msop-8 package. figure 2-13: start-up after enable. figure 2-14: 100 ma pwm operation. figure 2-15: 400 hz pwm dimming, 85% duty cycle. figure 2-16: start-up when v in =v en . figure 2-17: 400 hz pwm dimming, 15% duty cycle. figure 2-18: open load response. v en 80 us/div 1 v/div v in i led 20 ma/div 20 mv/div, ac coupled v out 1 v/div v sw i led 100 ma/div 1us/div i led 50 ma/div 1 v/div v sw 1 v/div v en 400 us/div 80 us/div 500 ma/div i l 1 v/div v in i led 20 ma/div i led 50 ma/div 1 v/div v sw 1 v/div v en 400 us/div i led 10 ms/div 2 v/div step from i led = 100 ma to open load 2 v/div 100 ma/div v out v sw 2v 5v downloaded from: http:/// mcp1643 ds20005208a-page 8 ? 2013 microchip technology inc. notes: downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 9 mcp1643 3.0 pin descriptions the descriptions of the pins are listed in tab l e 3 - 1 . 3.1 enable pin (en) the en pin is a logic-level input used to enable or disable device switching. device has low quiescent current while disabled. a logic high (>75% of v in ) will enable the regulator output. a logic low (<20% of v in ) will ensure that the regulator is disabled. 3.2 feedback voltage pin (v fb ) the v fb pin is used to regulate the voltage across the r set sense resistor to 120 mv, to keep the output led current in regulation. 3.3 unconnected pin (nc) this pin is unconnected. 3.4 output voltage power pin (v out ) high current flows through the integrated p-channel and out of this pin to the output capacitor, led load and r set sense resistor. the output voltage must be filtered using a 4.7 to 20 f x7r or x5r ceramic capacitor. the value of the output capacitor depends on the load current. 3.5 switch node pin (sw) connect the inductor from the input voltage to the sw pin. the sw pin carries inductor current and can be as high as 1.6 a typical peak value. the integrated n-channel switch drain and integrated p-channel switch source are internally connected at the sw node. 3.6 power ground (p gnd ) and signal ground pins (s gnd ) the power ground pins are used as a return for the high-current n-channel switch. the signal ground pin is used as a return for the integrated v fb and error amplifier. the length of the trace from input cap return, output cap return and p gnd and s gnd should be made as short as possible to minimize noise on the ground pins. the s gnd and p gnd pins are connected externally. 3.7 power supply input voltage pin (v in ) connect the input voltage source to v in . the input source should be decoupled to gnd with a 4.7 f minimum capacitor. 3.8 exposed thermal pad (ep) there is no internal electrical connection between the exposed thermal pad (ep) and the p gnd and s gnd pins. they must be connected to the same potential on the printed circuit board (pcb). table 3-1: pin function table mcp1643 2x3 dfn mcp1643 msop symbol description 1 1 en enable pin. the logic high enables the operation. do not allow this pin to float. 22v fb reference voltage pin. connect to the v fb pin, the r set (led current set resistor), and the cathode of the led load. 3 3 nc unconnected pin 44v out boost converter output pin. connect to this pin the anode of the led load. an output filter capacitor is required. 5 5 sw boost and rectifier switch input pin. connect the boost inductor between sw and v in . 66p gnd power ground reference pin 77s gnd signal ground reference pin 88v in input supply voltage pin. a local bypass capacitor is required. 9 ep exposed thermal pad, must be connected to v ss downloaded from: http:/// mcp1643 ds20005208a-page 10 ? 2013 microchip technology inc. notes: downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 11 mcp1643 4.0 detailed description 4.1 device overview the mcp1643 is capable of starting up with a low volt- age, while achieving high efficiency to drive one or more leds with constant current. the mcp1643 is a fixed frequency, synchronous step-up converter, with a low voltage reference of 120 mv, optimized to keep the output current constant by regulating the voltage across the feedback resistor (r set ). the normal boost converter with a high voltage reference has a high voltage drop across the current sense resistor. the power dissipated in the sense resistor reduces the efficiency of a led driver solution. therefore, the voltage drop on the sense resistor used to regulate the led current must be low, in this case by a low v fb value of 120 mv. the device can operate from one or two-cell alkaline and nimh/nicd batteries. the maximum input voltage is 5.0v. the device features an overvoltage protection that protects the device if the output voltage (v out ) is higher than 5.0v. this usually happens if the led is disconnected. while v in ? 2013 microchip technology inc. ds20005208a-page 13 mcp1643 4.2.6 internal compensation the error amplifier, with its associated compensation network, completes the closed loop system by comparing the voltage from the sense resistor to a 120 mv reference at the input of the error amplifier and feeding the amplified and inverted signal to the control input of the inner current loop. the compensation network provides phase leads and lags at appropriate frequencies to cancel excessive phase lags and leads of the power circuit. all necessary compensation components and slope compensation are integrated. 4.2.7 short circuit protection unlike most boost converters, the mcp1643 led constant current driver allows its output to be shorted during normal operation. the internal current limit and overtemperature protection limit excessive stress and protect the device during periods of short circuit, overcurrent and overtemperature. 4.2.8 output overvoltage protection overvoltage protection is designed to protect the mcp1643 if the output voltage (v out ) becomes higher than 5.0v. because the device is a step-up converter that runs as a constant current generator, if the load is disconnected, the output increases up to dangerous voltages. this happens when the led fails. the device stops switching and the v out value is verified periodically if it is higher than 5.0v (see figure 2-18 ). this feature does not protect the led. an optional zener diode is added between v out and v fb pins to clamp the output voltage and protects the led against excessive voltage and current. 4.2.9 overtemperature protection overtemperature protection circuitry is integrated in the mcp1643 led constant current driver. this circuitry monitors the device junction temperature and shuts the device off if the junction temperature exceeds the typical +150c threshold. if this threshold is exceeded, the device will automatically restart once the junction temperature drops by 25c. downloaded from: http:/// mcp1643 ds20005208a-page 14 ? 2013 microchip technology inc. notes: downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 15 mcp1643 5.0 application information 5.1 typical applications the mcp1643 synchronous boost regulator operates at 0.5v input. the maximum output voltage range is limited by overvoltage protection at 5.0v. led current stays in regulation while v in ? v out minus a 300 C 400 mv headroom. the power efficiency conversion is high when driving led currents up to hundreds of ma. output current capability is limited by the 1.6a typical peak input current limit. typical characterization curves in this data sheet are presented to display the typical output current capability. 5.2 led brightness control 5.2.1 adjustable constant current calculations to calculate the resistor values for the mcp1643s led current, use equation 5-1 , where r set is connected to v fb and gnd. the reference voltage (v fb ) is 120 mv. equation 5-1: example 1: example 2: power dissipated on the r set resistor is very low and equal with v fb *i led . for 100 ma led current, the power dissipated on sense resistor is only 12 mw, and the efficiency of the conversion is high. equation 5-1 applies for one or even two leds in series connection. the typical applications graphic shows the maximum and minimum limits for r set over the input voltage range that ensures current regulation for a white led. 5.2.2 pwm dimming leds brightness can also be controlled by setting a maximum current allowed for led (using equation 5-1 ) and lowering it in small steps with a variable duty cycle pwm signal applied to the en pin. the maximum frequency for dimming is limited by the soft start, which varies with the led current. by varying the duty cycle of the signal applied on the en pin (from 0 to 100%), the led current is changing linearly (see figure 2-8 ). 5.3 input capacitor selection the boost input current is smoothed by the boost inductor, reducing the amount of filtering necessary at the input. some capacitance is recommended to provide decoupling from the source. low esr x5r or x7r are well suited, since they have a low temperature coefficient and small size. for most applications, 4.7 f of capacitance is sufficient at the input. for high- power applications that have high-source impedance or long leads, connecting the battery to 10 f capaci- tance is recommended. additional input capacitance can be added to provide a stable input voltage. 5.4 output capacitor selection the output capacitor helps provide a stable output voltage and smooth load current during sudden load transients, as is the pwm dimming. ceramic capacitors are well suited for this application (x5r and x7r). the range of the output capacitor vary from 4.7 f (in case of light loads and static applications) up to 20 f (for hundreds of milliamp led currents and pwm dimming applications). 5.5 connecting more leds to output white leds have a typical 2.7 to 3.2v forward voltage (v f ), which depends on the power dissipated according to its v f /i f characteristic. because mcp1643 allows up to 5.0v maximum to output, two white leds in series connection are not possible. two or more white leds can be connected in parallel to output, as shown in figure 6-1 . current sensing is necessary only for one led. each led of the string is passed by the calculated current according to equation 5-1 . a protection circuit formed by a zener and general purpose diodes will protect the rest of leds, if the led in the sense loop fails. two red, green or yellow leds can be connected in series to the output of mcp1643 (see application example on figure 6-2 ). red leds have a typical v f between 1.8v and 2.2v (it depends on the real color), yellow leds have the v f between 2.1v and 2.2v, while for green options, consider values from 2.0v to 2.4v. v fb = 120 mv i led =25ma r set =4.8 ??? with a standard value of 4.7 ?? i led is 25.53 ma) v fb = 120 mv i led = 100 ma r set =1.2 ? i led v fb r set ----------- - = downloaded from: http:/// mcp1643 ds20005208a-page 16 ? 2013 microchip technology inc. 5.6 inductor selection the mcp1643 device is designed to be used with small surface mount inductors. an inductance value of 4.7 h is recommended to achieve a good balance between the inductor size, converter load transient response and minimized noise. several parameters are used to select the correct inductor: maximum-rated current saturation current copper resistance (esr) for boost converters, the inductor current can be much higher than the output current. the lower the inductor esr, the higher the efficiency of the converter, a common trade-off in size versus efficiency. the saturation current typically specifies a point at which the inductance has rolled off a percentage of the rated value. this can range from a 20% to 40% reduction in inductance. as the inductance rolls off, the inductor ripple current increases, as does the peak switch current. it is important to keep the inductance from rolling off too much, causing switch current to reach the peak limit. 5.7 thermal calculations the mcp1643 is available in two different packages: msop-8 and 2 x 3 dfn-8. by calculating the power dissipation and applying the package thermal resis- tance ( ? ja ), the junction temperature is estimated. the maximum continuous ambient temperature rating for the mcp1643 family of devices is +85c. to quickly estimate the internal power dissipation for the switching boost regulator, an empirical calculation using measured efficiency can be used. given the measured efficiency, the internal power dissipation is estimated by equation 5-2 : equation 5-2: the difference between the first term, input power, and the second term, power delivered, is the internal mcp1643s power dissipation. this is an estimate assuming that most of the power lost is internal to the mcp1643 device and not c in , c out and the inductor. there is some percentage of power lost in the boost inductor, with very little loss in the input and output capacitors. for a more accurate estimation of the internal power dissipation, subtract the i inrms 2 xl dcr power dissipation. 5.8 pcb layout information good printed circuit board layout techniques are important to any switching circuitry, and switching power supplies are no different. when wiring the switching high current paths, short and wide traces should be used. for the mcp1643, these paths are from v in pin to the v out, output capacitor, led load, r set sense resistor, and s gnd and p gnd pins to the input capacitor. therefore, it is important that the input and output capacitors be placed as close as possible to the mcp1643, to minimize the loop area. the feedback track should be routed away from the switching node and close to the v fb pin. r set must be connected as close as possible to the v fb pin, unless regulation issues appears. when possible, ground planes and traces should be used to help shield the feedback signal and minimize noise and magnetic interference. table 5-1: mcp1643 recommended inductors part number value (h) dcr ( ?? ? typ) i sat (a) size wxlxh (mm) wurth ? group 744025004 4.7 0.100 1.7 2.8x2.8x2.8 744042004 4.7 0.082 1.65 4.8x4.8x1.8 coilcraft me3220 4.7 0.190 1.5 2.5x3.2x2.0 lps4018 4.7 0.125 1.8 4x4x1.8 xfl4020 4.7 0.052 2.0 4x4x2.1 tdk corporation b82462 g4472m 4.7 0.04 1.8 6x6x3 b82462 a4472m 4.7 0.08 2.8 6x6x3 slf6028- 4r7m1r6 4.7 0.028 1.6 6x6x2.8 v out i out ? efficiency ------------------------------------- ?? ?? v out i out ? ?? ? p dis = downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 17 mcp1643 figure 5-1: mcp1643 led constant current driver msop8 recommended layout. apply the same guidance for 8-dfn package. c out l c in +v in gnd +v out mcp1643 enable led r set gnd wired on bottom plane 1 a k sw downloaded from: http:/// mcp1643 ds20005208a-page 18 ? 2013 microchip technology inc. notes: downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 19 mcp1643 6.0 typical application circuits figure 6-1: three white leds application powered from one or two cells. figure 6-2: 150 ma two power red leds driver with pwm dimming control from pic ? microcontroller. note: d z and d group protects wled2 and wled3 from excessive voltage and current, if wled1 fails. the mcp1643 input quiescent current in shutdown (en = gnd) is typically 1.2 a. high- load currents require additional output capacitance. v in gnd v fb c out 10...20 f c in 4.7...10 f l 1 4.7 h sw wled1 2.4 ? en v out on off i led1 =50ma r set wled2 2.4 ? r 2 wled3 2.4 ? r 3 i led2 =50ma i led3 =50ma battery input (one or two cells) d z v z =2.4v d mcp1643 i led 0.12v r set -------------- = from pic ? mcu i/o v in gnd v fb c out 20 f c in 4.7 C 10 f l1 4.7 h sw led1 - red 0.82 ? en v out i led =150ma r set battery input (one or two cells) led2 - red pwm signal, f = 400 hz, duty cycle variable i led 0.12v r set -------------- = mcp1643 downloaded from: http:/// mcp1643 ds20005208a-page 20 ? 2013 microchip technology inc. notes: downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 21 mcp1643 7.0 packaging information 7.1 package marking information 8-lead msop example 1643i 312256 8-lead dfn (2 x 3 x 0.9 mm) example akf 312 25 part number code mcp1643-i/mc akf mcp1643t-i/mc akf legend: xx...x customer-specific information y year code (last digit of calendar year) yy year code (last 2 digits of calendar year) ww week code (week of january 1 is week 01) nnn alphanumeric traceability code rohs compliant jedec designator for matte tin (sn) * this package is rohs compliant. the rohs compliant jedec designator ( ) can be found on the outer packaging for this package. note : in the event the full microchip part number cannot be marked on one line, it will be carried over to the next line, thus limiting the number of available characters for customer-specific information. 3 e 3 e part number code mcp1643-i/ms 1643i mcp1643t-i/ms 1643i downloaded from: http:/// mcp1643 ds20005208a-page 22 ? 2013 microchip technology inc. ! " #$ %! & '(!%&! %( % ")%% % " * & & # "% ( % " + * ) ! % " & "% ,- . /01 / & % # % ! ))%!%% ,21 $ & '! ! )%!%% '$$& % ! 2% & %! % * " ) ' % * $ % % " % %% 133))) & &3 * 4% 55,, & 5&% 6 67 8 6!&( $ 6 9 % ./0 7 : % 9 % "$$ . 0% %* + ,2 7 5 % /0 7 ;"% , + /0 ,# " "5 % + < .. ,# " ";"% , . < . 0% %;"% ( . + 0% %5 % 5 + . 0% % % ,# " " = < < d n e note 1 1 2 exposed pad note 1 2 1 d2 k l e2 n e b a3 a1 a note 2 bottom view top view ) 0 +0 downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 23 mcp1643 note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:/// mcp1643 ds20005208a-page 24 ? 2013 microchip technology inc. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 25 mcp1643 note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:/// mcp1643 ds20005208a-page 26 ? 2013 microchip technology inc. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 27 mcp1643 appendix a: revision history revision a (august 2013) original release of this document. downloaded from: http:/// mcp1643 ds20005208a-page 28 ? 2013 microchip technology inc. notes: downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 29 mcp1643 product identification system to order or obtain information, e. g., on pricing or delivery, refer to the factory or the listed sales office . device: mcp1643: led constant current regulator mcp1643t: led constant current regulator (tape and reel) temperature range: i= - 4 0 ? c to +85 ? c (industrial) package: mc = plastic dual flat, no lead package - 2x3x0.9 mm body (dfn) ms = plastic micro small outline package (msop) examples: a) mcp1643-i/mc: industrial temperature, 8ld 2x3 dfn package b) mcp1643t-i/mc: tape and reel, industrial temperature, 8ld 2x3 dfn package c) mcp1643-i/ms: industrial temperature, 8ld msop package d) mcp1643t-i/ms: tape and reel, industrial temperature, 8ld msop package part no. x /xx package temperature range device downloaded from: http:/// mcp1643 ds20005208a-page 30 ? 2013 microchip technology inc. notes: downloaded from: http:/// ? 2013 microchip technology inc. ds20005208a-page 31 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 buyers 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. trademarks the microchip name and logo, the microchip logo, dspic, flashflex, k ee l oq , k ee l oq logo, mplab, pic, picmicro, picstart, pic 32 logo, rfpic, sst, sst logo, superflash and uni/o are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, hampshire, hi-tech c, linear active thermistor, mtp, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. silicon storage technology is a registered trademark of microchip technology inc. in other countries. analog-for-the-digital age, app lication maestro, bodycom, chipkit, chipkit logo, codeguard, dspicdem, dspicdem.net, dspicworks, dsspeak, ecan, economonitor, fansense, hi-tide, in-circuit serial programming, icsp, mindi, miwi, mpasm, mpf, mplab certified logo, mplib, mplink, mtouch, omniscient code generation, picc, picc-18, picdem, picdem.net, pickit, pictail, real ice, rflab, select mode, sqi, serial quad i/o, total endurance, tsharc, uniwindriver, wiperlock, zena and z-scale 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. gestic and ulpp are registered trademarks of microchip technology germany ii gmbh & co. kg, a subsidiary of microchip technology inc., in other countries. all other trademarks mentioned herein are property of their respective companies. ? 2013, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. isbn: 978-1-62077-402-1 note the following details of the code protection feature on microchip devices: microchip products meet the specification cont ained in their particular microchip data sheet. microchip believes that its family of products is one of the most secure families of its kind on the market today, when used i n the intended manner and under normal conditions. there are dishonest and possibly illegal methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specif ications contained in microchips data sheets. most likely, the person doing so is engaged in theft of intellectual property. microchip is willing to work with the customer who is concerned about the integrity of their code. neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as unbreakable. code protection is constantly evolving. we at microchip are co mmitted to continuously improvin g the code protection features of our products. attempts to break microchips code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2009 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 ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory an d analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001:2000 certified. quality management s ystem certified by dnv == iso/ts 16949 == downloaded from: http:/// ds20005208a-page 32 ? 2013 microchip technology inc. americas corporate office 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7200 fax: 480-792-7277 technical support: http://www.microchip.com/ support web address: www.microchip.com atlanta duluth, ga tel: 678-957-9614 fax: 678-957-1455 boston westborough, ma tel: 774-760-0087 fax: 774-760-0088 chicago itasca, il tel: 630-285-0071 fax: 630-285-0075 cleveland independence, oh tel: 216-447-0464 fax: 216-447-0643 dallas addison, tx tel: 972-818-7423 fax: 972-818-2924 detroit farmington hills, mi tel: 248-538-2250 fax: 248-538-2260 indianapolis noblesville, in tel: 317-773-8323 fax: 317-773-5453 los angeles mission viejo, ca tel: 949-462-9523 fax: 949-462-9608 santa clara santa clara, ca tel: 408-961-6444 fax: 408-961-6445 toronto mississauga, ontario, canada tel: 905-673-0699 fax: 905-673-6509 asia/pacific asia pacific office suites 3707-14, 37th floor tower 6, the gateway harbour city, kowloon hong kong tel: 852-2401-1200 fax: 852-2401-3431 australia - sydney tel: 61-2-9868-6733 fax: 61-2-9868-6755 china - beijing tel: 86-10-8569-7000 fax: 86-10-8528-2104 china - chengdu tel: 86-28-8665-5511 fax: 86-28-8665-7889 china - chongqing tel: 86-23-8980-9588 fax: 86-23-8980-9500 china - hangzhou tel: 86-571-2819-3187 fax: 86-571-2819-3189 china - hong kong sar tel: 852-2943-5100 fax: 852-2401-3431 china - nanjing tel: 86-25-8473-2460 fax: 86-25-8473-2470 china - qingdao tel: 86-532-8502-7355 fax: 86-532-8502-7205 china - shanghai tel: 86-21-5407-5533 fax: 86-21-5407-5066 china - shenyang tel: 86-24-2334-2829 fax: 86-24-2334-2393 china - shenzhen tel: 86-755-8864-2200 fax: 86-755-8203-1760 china - wuhan tel: 86-27-5980-5300 fax: 86-27-5980-5118 china - xian tel: 86-29-8833-7252 fax: 86-29-8833-7256 china - xiamen tel: 86-592-2388138 fax: 86-592-2388130 china - zhuhai tel: 86-756-3210040 fax: 86-756-3210049 asia/pacific india - bangalore tel: 91-80-3090-4444 fax: 91-80-3090-4123 india - new delhi tel: 91-11-4160-8631 fax: 91-11-4160-8632 india - pune tel: 91-20-2566-1512 fax: 91-20-2566-1513 japan - osaka tel: 81-6-6152-7160 fax: 81-6-6152-9310 japan - tokyo tel: 81-3-6880- 3770 fax: 81-3-6880-3771 korea - daegu tel: 82-53-744-4301 fax: 82-53-744-4302 korea - seoul tel: 82-2-554-7200 fax: 82-2-558-5932 or 82-2-558-5934 malaysia - kuala lumpur tel: 60-3-6201-9857 fax: 60-3-6201-9859 malaysia - penang tel: 60-4-227-8870 fax: 60-4-227-4068 philippines - manila tel: 63-2-634-9065 fax: 63-2-634-9069 singapore tel: 65-6334-8870 fax: 65-6334-8850 taiwan - hsin chu tel: 886-3-5778-366 fax: 886-3-5770-955 taiwan - kaohsiung tel: 886-7-213-7828 fax: 886-7-330-9305 taiwan - taipei tel: 886-2-2508-8600 fax: 886-2-2508-0102 thailand - bangkok tel: 66-2-694-1351 fax: 66-2-694-1350 europe austria - wels tel: 43-7242-2244-39 fax: 43-7242-2244-393 denmark - copenhagen tel: 45-4450-2828 fax: 45-4485-2829 france - paris tel: 33-1-69-53-63-20 fax: 33-1-69-30-90-79 germany - munich tel: 49-89-627-144-0 fax: 49-89-627-144-44 italy - milan tel: 39-0331-742611 fax: 39-0331-466781 netherlands - drunen tel: 31-416-690399 fax: 31-416-690340 spain - madrid tel: 34-91-708-08-90 fax: 34-91-708-08-91 uk - wokingham tel: 44-118-921-5869 fax: 44-118-921-5820 worldwide sales and service 11/29/12 downloaded from: http:/// |
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