MIC94050/94051 micrel january 2007 1 MIC94050/94051 MIC94050/94051 4-terminal symfet? p-channel mosfet general description the MIC94050 and mic94051 are 4-terminal silicon gate p-channel mosfets that provide low on-resistance in a very small package. designed for high-side switch applications where space is critical, the MIC94050/1 exhibits an on-resistance of typically 0.125 at 4.5v gate-to-source voltage. the MIC94050/1 also operates with only 1.8v gate-to-source voltage. the MIC94050 is the basic 4-lead p-channel mosfet. the mic94051 is a variation that includes an internal gate pull- up resistor that can reduce the system parts count in many applications. the 4-terminal sot-143 package permits a substrate con - nection separate from the source connection. this 4-terminal con?guration improves the ja (improved heat dissipation) and makes reverse-blocking switch applications practical. the small size, low threshold, and low r ds(on) make the MIC94050/1 the ideal choice for pcmcia, usb, back-up battery-power, and distributed power management applica - tions. symfet? features ? 0.125 typical on-resistance at 4.5v gate-to-source voltage ? operates with 1.8v gate-to-source voltage ? separate substrate connection allows reverse-blocking applications ? distributed power management ? pcmcia card power management ? usb ports ? battery-powered computers, peripherals ? handheld bar-code scanners ? portable communications equipment ? reverse blocking battery management ordering information part number temp. range* package pb-free MIC94050bm4 C40c to +150c sot-143 no mic94051bm4 C40c to +150c sot-143 no MIC94050ym4 C40c to +150c sot-143 yes mic94051ym4 C40 to +150c sot-143 yes * operating junction temperature g ate source drain substrate schematic symbol MIC94050 mic94051 schematic symbol pin con?guration sot-143 package (m4) typical pcb layout s d g s s pcb heat sin k plane improves heat dissipation pcb traces g s d ss ~350k ? internal gate-to-source pull-up resistor g s d s s functional diagrams substrate source gate drain p5x part identification part number identi?cation MIC94050bm4 p50 mic94051bm4 p51 MIC94050ym4 p 50 mic94051ym4 p 51 micrel, inc. ? 1849 fortune drive ? san jose, ca 95131 ? usa ? tel + 1 (408) 944-0800 ? fax + 1 (408) 944-0970 ? http://www.micrel.com symfet is a trademark of micrel, inc.
MIC94050/94051 micrel MIC94050/94051 2 january 2007 electrical characteristics (note 1) symbol parameter condition (note 1) min typ max units v gs gate threshold voltage v ds = v gs , i d = C250a 0.5 1.2 v i gss gate-body leakage v ds = 0v, v gs = C4.5v, note 2 , note 3 1 a r gs gate-source resistance v ds = 0v, v gs = C4.5v, note 2 , note 4 200 350 500 k c iss input capacitance v gs = 0v, v ds = C5.5v 600 pf i dss zero gate voltage drain current v ds = C5.5v, v gs = 0v 1 a v ds = C5.5v, v gs = 0v, t j = 85c 5 a r ds(on) drain-source on-resistance v gs = C4.5v, i d = C100ma 0.125 0.160 v gs = C3.6v, i d = C100ma 0.135 0.180 v gs = C2.5v, i d = C100ma 0.165 0.200 v gs = C1.8v, i d = C100ma 0.225 0.320 g fs forward transconductance v ds = C5.5v, i d = C200ma, note 5 3 s note 1. t a = 25c unless noted. substrate connected to source for all conditions. note 2. esd gate3 precautions required note 3. MIC94050 only. note 4. mic94051 only. note 5. pulse test: pulse width 80s, duty cycle 0.5%. absolute maximum ratings drain-to-source voltage ............................................................ C6v gate-to-source voltage ................................................. C6v continuous drain current t a = 25c (v gs = 4.5v) ............................................ 1.8a t a = 100c (v gs = 4.5v) .......................................... 1.2a total power dissipation t a = 25c ............................................................. 568mw t a = 100c ........................................................... 227mw operating junction temperature .............. C40c to +150c storage temperature ................................ C55c to +150c esd rating, note 2 operating ratings thermal resistance ja ...................................................................... 220c/w jc ..................................................................... 130c/w
MIC94050/94051 micrel january 2007 3 MIC94050/94051 typical characteristics 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 i d (a) drain-to-source voltage (v) drain characteristic s 1. 5v gs 2. 0v gs 2. 5v gs 3. 0v gs 3. 5v gs 0 100 200 300 400 500 600 700 800 900 1000 0 1 2 3 4 5 6 r ds(on) (m ? ) gate-to-source voltage (v) on -resistance v s. gate-to-source voltag e i d = 1a i d = 100ma 0 100 200 300 400 500 0 1 2 3 4 r ds(on) (m ? ) drain current (a) r ds(on) vs. drain current 2. 5v gs 3. 3v gs 1. 8v gs 4. 2v gs 0 0.5 1 1.5 2 2.5 0 1 2 3 4 drain-source diode v f (v) drain-source current (a) source drai n di od e forw ard volt age drop vs. current 100 s puls e 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -60 -40 -20 0 20 40 60 80 100 120 140 160 gate threshold (v) temperature ( c) ga te th reshol d vs. t emp erat ur e i d = C250 a 0.7 0.8 0.9 1 1.1 1.2 1.3 -40 -15 10 35 60 85 110 135 r ds(on) (normalized) temperature ( c) r ds(o n) vari ance vs. t emp erat ur e v ds =3.6 v i d =0.1 a
MIC94050/94051 micrel MIC94050/94051 4 january 2007 typical applications load +5v 74hc04 on off * substrate must be connected to source s s s * d g MIC94050 figure 1. load switch application load +5v open drain output * substrate must be connected to source s s s * d g mic94051 internal resistor figure 2. load switch application (with internal gate-source pull-up) +4v on off s s s d g MIC94050 +2.7v to 3.6v li coin cell on off s s s d g MIC94050 load 2m ? a b output of f o ff 0v on off +4v of f o n li coin cell on on dont! a b figure 3. reverse-blocking battery back-up application
MIC94050/94051 micrel january 2007 5 MIC94050/94051 package information sot-143 (m4) 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 the 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 the customer. micrel products are noth 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. ? 2002 micrel, incorporated
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