april 2008 1 m9999-042108 mic4426/4427/4428 micrel, inc. mic4426/4427/4428 dual 1.5a-peak low-side mosfet driver general description the mic4426/4427/4428 family are highly-reliable dual low- side mosfet drivers fabricated on a bicmos/dmos pro cess for low power consumption and high ef?ciency. these drivers translate ttl or cmos input logic levels to output voltage levels that swing within 25mv of the positive supply or ground. comparable bipolar devices are capable of swinging only to within 1v of the supply. the mic4426/7/8 is available in three con?gurations: dual inverting, dual noninverting, and one inverting plus one noninverting output. the mic4426/4427/4428 are pin-compatible replacements for the mic426/427/428 and mic1426/1427/1428 with im- proved electrical performance and rugged design (refer to the device replacement lists on the following page). they can withstand up to 500ma of reverse current (either polarity) without latching and up to 5v noise spikes (either polarity) on ground pins. primarily intended for driving power mosfets, mic4426/7/8 drivers are suitable for driving other loads (capac itive, resistive, or inductive) which require low-impedance, high pea k current, and fast switching time. other applications include driving heavily loaded clock lines, coaxial cables, or piezoelectric transducers. the only load limitation is that total driver power dissipation must not exceed the limits of the package. note see mic4126/4127/4128 for high power and narrow pulse applications. functional diagram ina outa i n v e r t i n g noninverting 0.1ma 0.6ma 2k? inb o u t b i n v e r t i n g noninverting 0.1ma 0.6ma 2k? v s gnd features ? bipolar/cmos/dmos construction ? latch-up protection to >500ma reverse current ? 1.5a-peak output current ? 4.5v to 18v operating range ? low quiescent supply current 4ma at logic 1 input 400a at logic 0 input ? switches 1000pf in 25ns ? matched rise and rall times ? 7 output impedance ? <40ns typical delay ? logic-input threshold independent of supply voltage ? logic-input protection to C5v ? 6pf typical equivalent input capacitance ? 25mv max. output offset from supply or ground ? replaces mic426/427/428 and mic1426/1427/1428 ? dual inverting, dual noninverting, and inverting/ noninverting con?gurations ? esd protection applications ? mosfet driver ? clock line driver ? coax cable driver ? piezoelectic transducer driver micrel, inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408 ) 474-1000 ? http://www.micrel.com downloaded from: http:///
mic4426/4427/4428 micrel, inc. m9999-042108 2 april 2008 ordering information part number temperature standard pb-free range package con?guration mic4426bm mic4426ym C40oc to +85oc 8-pin soic dual inverting mic4426cm mic4426zm C0oc to +70oc 8-pin soic dual inverting mic4426bmm mic4426ymm C40oc to +85oc 8-pin msop dual inverting mic4426bn mic4426yn C40oc to +85oc 8-pin pdip dual inverting mic4426cn mic4426zn C0oc to +70oc 8-pin pdip dual inverting mic4427bm mic4427ym C40oc to +85oc 8-pin soic dual non-inverting mic4427cm mic4427zm C0oc to +70oc 8-pin soic dual non-inverting mic4427bmm mic4427ymm C40oc to +85oc 8-pin msop dual non-inverting mic4427bn mic4427yn C40oc to +85oc 8-pin pdip dual non-inverting mic4427cn mic4427zn C0oc to +70oc 8-pin pdip dual non-inverting mic4428bm mic4428ym C40oc to +85oc 8-pin soic inverting + non-inverting mic4428cm MIC4428ZM C0oc to +70oc 8-pin soic inverting + non-inverting mic4428bmm mic4428ymm C40oc to +85oc 8-pin msop inverting + non-inverting mic4428bn mic4428yn C40oc to +85oc 8-pin pdip inverting + non-inverting mic4428cn mic4428zn C0oc to +70oc 8-pin pdip inverting + non-inverting note desc standard military drawing 5962-88503 available; mic4426, cerdip 8-pin smd#: 5962-8850307pa micrel part number: 5952-88 50307pa mic4427, cerdip 8-pin smd#: 5962-8850308pa micrel part number: 5952-88 50308pa mic4428, cerdip 8-pin smd#: 5962-8850309pa micrel part number: 5952-88 50309pa mic426/427/428 device replacement discontinued number replacement mic426cm mic4426bm mic426bm mic4426bm mic426cn mic4426bn mic426bn mic4426bn mic427cm mic4427bm mic427bm mic4427bm mic427cn mic4427bn mic427bn mic4427bn mic428cm mic4428bm mic428bm mic4428bm mic428cn mic4428bn mic428bn mic4428bn mic1426/1427/1428 device replacement discontinued number replacement mic1426cm mic4426bm mic1426bm mic4426bm mic1426cn mic4426bn mic1426bn mic4426bn mic1427cm mic4427bm mic1427bm mic4427bm mic1427cn mic4427bn mic1427bn mic4427bn mic1428cm mic4428bm mic1428bm mic4428bm mic1428cn mic4428bn mic1428bn mic4428bn downloaded from: http:///
april 2008 3 m9999-042108 mic4426/4427/4428 micrel, inc. pin con?guration 12 3 4 87 6 5 n c ina gnd inb n c outa v s o u t b mic4426 dual inverting a b 75 24 mic4426 mic4427 mic4428 a b 75 24 a b 75 24 12 3 4 87 6 5 n c ina gnd inb n c outa v s o u t b mic4427 dual noninverting 12 3 4 87 6 5 n c ina gnd inb n c outa v s o u t b mic4428 inverting+ noninverting pin description pin number pin name pin function 1, 8 nc not internally connected 2 ina control input a: ttl/cmos compatible logic input. 3 gnd ground 4 inb control input b: ttl/cmos compatible logic input. 5 outb output b: cmos totem-pole output. 6 v s supply input: +4.5v to +18v 7 outa output a: cmos totem-pole output. downloaded from: http:///
mic4426/4427/4428 micrel, inc. m9999-042108 4 april 2008 absolute maximum ratings (1) supply voltage (v s ) ..................................................... +22v input voltage (v in ) .......................... v s + 0.3v to gnd C 5v junction temperature (t j ) ......................................... 150c storage temperature ................................ C65c to +150c lead temperature (10 sec.) ...................................... 300c esd rating (3) operating ratings (2) supply voltage (v s ) ...................................... +4.5v to +18v temperature range (t a ) (a) ......................................................... C55c to +125c (b) ........................................................... C40c to +85c package thermal resistance pdip ja .......................................................................... 130c/w pdip jc ............................................................................ 42c/w soic ja ........................................................... 120c/w soic jc ............................................................ 75c/w msop ja ......................................................... 250c/w electrical characteristics (4) 4.5v v s 18v; t a = 25c, bold values indicate full speci?ed temperature range; unless noted. symbol parameter condition min typ max units inputv ih logic 1 input voltage 2.4 1.4 v 2.4 1.5 v v il logic 0 input voltage 1.1 0.8 v 1.0 0.8 v i in input current 0 v in v s C1 1 a outputv oh high output voltage v s C0.025 v v ol low output voltage 0.025 v r o output resistance i out = 10ma, v s = 18v 6 10 8 12 i pk peak output current 1.5 a i latch-up protection withstand reverse current >500 ma switching time t r rise time test figure 1 18 30 ns 20 40 ns t f fall time test figure 1 15 20 ns 29 40 ns t d1 delay tlme test flgure 1 17 30 ns 19 40 ns t d2 delay time test figure 1 23 50 ns 27 60 ns t pw pulse width test figure 1 400 ns power supplyi s power supply current v ina = v inb = 3.0v 0.6 1.4 4.5 ma 1.5 8 ma i s power supply current v ina = v inb = 0.0v 0.18 0.4 ma 0.19 0.6 ma notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. handling precautions recommended. 4. speci?cation for packaged product only. downloaded from: http:///
april 2008 5 m9999-042108 mic4426/4427/4428 micrel, inc. test circuits a b ina inb 2 4 mic4427 5 7 outa 1000pf 6 v s = 18v 0.1f 4.7f o u t b 1000pf figure 2a. noninverting con?guration 90% 10% t r 10% 0v 5v t f v s o u t p u t input 90% 0v t d1 t d2 t p w 2.5v figure 2b. noninverting timing a b ina inb 2 4 mic4426 5 7 outa 1000pf 6 v s = 18v 0.1f 4.7f o u t b 1000pf figure 1a. inverting con?guration t d1 90% 10% t f 10% 0v 5v t d2 t r v s o u t p u t input 90% 0v 2.5v t p w figure 1b. inverting timing downloaded from: http:///
mic4426/4427/4428 micrel, inc. m9999-042108 6 april 2008 electrical characteristics rise and fall time vs. 0 5 20 10 15 t f supply voltage (v) 7060 50 40 10 0 time (ns) 20 30 0 5 20 10 15 supply voltage (v) 3530 25 20 50 time (ns) 10 15 4030 10 time (ns) 20 -25 0 150 25 50 temperature (c) 75 100 125 3530 25 20 50 time (ns) 10 15 -25 0 150 25 50 temperature (c) 75 100 125 t d1 8070 60 50 20 0 supply current (ma) 30 4010 400khz 200khz 20khz 10 10000 100 capacitive load (pf) 1000 1k 100 10 1 time (ns) 10 10000 100 capacitive load (pf) 1000 t r t f supply current vs. frequency v = 18v s 10 v 5 v 20 0 supply current (ma) 3010 1 1000 10 frequency (khz) 100 high output vs. current | v C v | (v) s out current sourced (ma) low output vs. current 1.200.96 0 0.48 0.720.24 0 10 current sunk (ma) 20 30 40 50 60 70 80 90 100 10 v 15 v output vol t age (v) 1.200.96 0 0.48 0.720.24 0 10 20 30 40 50 60 70 80 90 100 10 v 15 v -50 t r -50 -75 t r t f -75 t d2 t d1 t d2 c = 1000pf t = 25c l a c = 1000pf t = 25c l a c = 1000pfv = 18v l s c = 1000pfv = 18v l s t = 25c v = 18v a s t = 25c v = 18v a s t = 25c c = 1000pf l a t = 25c a v = 5v c t = 25c a v = 5v s 25 50 150 75 100 ambient temperature (c) 1000 750250 0 500 0 0.5 2.51.0 1.5 supply current (ma) 20 15 5 0 supply voltage (v) 10 2.0 125 supply current (a) 15 10 0 5 0 50 100 150 200 300 400 20 supply voltage (v) maximum package power dissip a tion (mw) 1250 no loadboth inputs logic "1" t = 25c a no loadboth inputs logic "0" t = 25c a soic pdip supply voltage delay time vs. supply voltage rise and fall time vs. temperature rise and fall time vs. capacitive load supply current vs. capacitive load delay time vs. temperature quiescent power supply current vs. supply voltage quiescent power supply current vs. supply voltage package power dissipation downloaded from: http:///
april 2008 7 m9999-042108 mic4426/4427/4428 micrel, inc. applications informationsupply bypassing large currents are required to charge and discharge large capacitive loads quickly. for example, changing a 1000pf load by 16v in 25ns requires 0.8a from the supply input. to guarantee low supply impedance over a wide frequency range, parallel capacitors are recommended for powe r supply bypassing. low-inductance ceramic mlc capacitors wi th short lead lengths (< 0.5) should be used. a 1.0f ?lm capacitor in parallel with one or two 0.1f ceramic mlc capacitors normally provides adequate bypassing. grounding when using the inverting drivers in the mic4426 or mic4428, individual ground returns for the input and output circuits or a ground plane are recommended for optimum switching speed. the voltage drop that occurs between the drivers ground and the input signal ground, during normal high-cur- rent switching, will behave as negative feedback and degrade switching speed. control input unused driver inputs must be connected to logic high (which can be v s ) or ground. for the lowest quiescent current (< 500a) , connect unused inputs to ground. a logic-high signal will cause the driver to draw up to 9ma. the drivers are designed with 100mv of control input hys- teresis. this provides clean transitions and minimizes output stage current spikes when changing states. the control input voltage threshold is approximately 1.5v. the control input recognizes 1.5v up to v s as a logic high and draws less than 1a within this range. the mic4426/7/8 drives the tl494, sg1526/7, mic38c42, tsc170 and similar switch-mode power supply integrated circuits. power dissipation power dissipation should be calculated to make sure that the driver is not operated beyond its thermal ratings. quiescent power dissipation is negligible. a practical value for total power dissipation is the sum of the dissipation caused by the load and the transition power dissipation (p l + p t ). load dissipation power dissipation caused by continuous load current (when driving a resistive load) through the drivers output resistance is: p l = i l 2 r o for capacitive loads, the dissipation in the driver is: p l = f c l v s 2 transition dissipation in applications switching at a high frequency, transition power dissipation can be signi?cant. this occurs during switching transitions when the p-channel and n-channel output fets are both conducting for the brief moment when one is turning on and the other is turning off. p t = 2 f v s q charge (q) is read from the following graph: 110 -8 810 -9 410 -9 310 -9 210 -9 610 -9 110 -9 4 6 8 10 12 14 16 18 supply voltage (v) charge (q) crossover energy loss per transition downloaded from: http:///
mic4426/4427/4428 micrel, inc. m9999-042108 8 april 2008 package information 45 0 C8 0.228?(5.79) 0.189?(4.8) plane max ) 0.010?(0.25)0.007?(0.18) 0.045?(1.14) 0.0040?(0.102) 0.013?(0.33) 0.150?(3.81) typ pin?1 inches?(mm) 0.016?(0.40) 8-pin soic (m) 0.004?(0.10) 0.035?(0.89) 0.021?(0.53) 0.012?(0.03)?r 0.0256?(0.65)?typ 0.012?(0.30)?r 5 0 ?min 0.112?(2.84) 0.116?(2.95) 0.012?(0.03) 0.007?(0.18)0.005?(0.13) 0.038?(0.97) 0.032?(0.81) inch?(mm) 0.187?(4.74) 8-pin mm8? msop (mm) 8-pin plastic dip (n) downloaded from: http:///
april 2008 9 m9999-042108 mic4426/4427/4428 micrel, inc. micrel inc. 2180 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com this information furnished by micrel in this data sheet is believed to be accurate and reliable. however no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and speci?cations at any time without noti?cation to t he customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signi?cant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is a purchaser s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2003 micrel, incorporated. downloaded from: http:///
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