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mic94090/1/2/3/4/5 high side load switches for consumer applications mlf and micro leadframe are registered trademarks of amkor technology, inc. micrel inc. 2180 fortune drive san jose, ca 95131 usa tel +1 ( 408 ) 944-0800 fax + 1 (408) 474-1000 http://www.micrel.com march 2009 m9999-033109-a general description the mic94090/1/2/3/4/5 is a fam ily of high-side load switches designed for operation from 1.7v to 5.5v input voltage. the load switch pass element is an internal 130m ? r ds(on) p- channel mosfet which enables the device to support up to 1.2a continuous current. additionally, the load switch supports 1.5v logic level c ontrol and shutdown features. the mic94090 and mic94091 feature rapid turn on. the mic94092 and mic94093 provide a slew rate controlled soft- start turn-on of 790s, while the mic94094 and mic94095 provide a slew rate controlled soft-start turn-on of 120s. the soft-start feature option prev ents an in-rush current event from pulling down the input supply voltage. the mic94091, mic94093, and mic94095 include a 250 ? auto discharge load circuit that is switched on when the load switch is disabled. an active pull-down on the enable input keeps the mic94090/1/2/3/4/5 in a default off state until the enable pin is pulled above 1.25v. internal level shift circuitry allows low voltage logic signals to switch higher supply voltages. the enable voltage can be as high as 5.5v and is not limited by the input voltage. the mic94090/1/2/3/4/5 operating voltage range makes them ideal for lithium ion and nimh/nicad/alkaline battery powered systems, as well as non-battery powered applications. the devices prov ide low quiescent current and low shutdown current to maximize battery life. datasheets and support documentation can be found on micrels web site at: www.micrel.com. features ? 1.7v to 5.5v input voltage range ? 1.2a continuous operating current ? 130m ? r ds(on) ? internal level shift for cmos/ttl control logic ? ultra low quiescent current ? micro-power shutdown current ? rapid turn-on: mic94090/1 ? soft-start: mic94092/3 (790s), mic94094/5 (120s) ? load discharge circuit: mic94091/3/5 ? space saving and thermally capable 1.2mm x 1.2mm thin mlf ? package ? industry standard sc-70-6 package applications ? cellular phones ? portable navigation devices (pnd) ? gps modules ? personal media players (pmp) ? ultra mobile pcs ? other portable applications ? pdas ? portable instrumentation ? industrial and datacomm equipment _________________________________________________________________________________________________________ typical application mic94090 (ultra fast turn on) mic94092 (790s soft-start) mic94094 (120s soft-start) mic94091 (ultra fast turn on with auto-discharge) mic94093 (790s soft-start with auto-discharge) mic94095 (120s soft-start with auto-discharge) downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 2 m9999-033109-a ordering information part number pb-free part marking pb-free (1) fast turn on soft- start load discharge package (2) (3) mic94090ymt d1 4-pin 1.2mm x 1.2mm thin mlf ? mic94091ymt d2 4-pin 1.2mm x 1.2mm thin mlf ? mic94092ymt d5 790s 4-pin 1.2mm x 1.2mm thin mlf ? mic94093ymt d7 790s 4-pin 1.2mm x 1.2mm thin mlf ? mic94094ymt 0d 120s 4-pin 1.2mm x 1.2mm thin mlf ? mic94095ymt 1d 120s 4-pin 1.2mm x 1.2mm thin mlf ? mic94090yc6 d1 d sc-70-6 mic94091yc6 d2 d sc-70-6 mic94092yc6 d5 d 790s sc-70-6 mic94093yc6 d7 d 790s sc-70-6 mic94094yc6 0d d 120s sc-70-6 mic94095yc6 1d d 120s sc-70-6 notes: 1. under bar symbol ( _ ) may not be to scale. 2. thin mlf ? = pin 1 identifier. 3. thin mlf ? is a green rohs-compliant package. lead fini sh is nipdau. mold compound is halogen free. pin configuration vout en vin gnd 1 23 4 pin 1 triangle by marking 4-pin (1.2mm x 1.2mm) thin mlf ? (mt) top view 6-pin sc-70-6 (c6) top view pin description pin number tmlf-4 sc-70-6 pin name pin function 1 1 v out drain of p-channel mosfet. 4 2, 5 gnd ground: connect to electrical ground. 3 4 v in source of p-channel mosfet. 2 6 en enable (input): active-high cmos-compatible control input for switch. internal 2m pull down resistor to gnd, output will be off if this pin is left floating. -- 3 nc no internal connection. a signal or voltage applied to this pin will have no effect on device operation. downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 3 m9999-033109-a absolute maximum ratings (1) input voltage (v in ) ...................................................... +6v enable voltage (v en ) ................................................. +6v continuous drain current (i d ) (3) t a = 25c (mlf ? ).............................................. 1.2a t a = 25c (sc- 70) ............................................ 1.2a pulsed drain current (i dp ) (4) .................................... 6.0a continuous diode current (i s ) (5) ............................ C50ma storage temperature (t s ) ..................... C55c to +150c esd rating C hbm (6) ...................................................3kv operating ratings (2) input voltage (v in )....................................... +1.7 to +5.5v junction temperature (t j ) .....................C40c to +125c package thermal resistance thin mlf ? ( jc ) (3) ............................................60c/w thin mlf ? ( ja ) (3) ..........................................140c/w sc-70-6 ( jc ) ................................................100c/w sc-70-6 ( ja ) ................................................240c/w electrical characteristics t a = 25c, bold values indicate C40c< t a < +85c, unless noted. symbol parameter condition min typ max units v en_th enable threshold voltage v in = 1.7v to 4.5v, i d = C250 a 0.4 1.25 v v in = v en = 5.5v, i d = open measured on v in mic94090/1 0.1 1 a i q quiescent current measured on the v in pin v in = v en = 5.5v, i d = open measured on v in mic94092/3/4/5 8 15 a i en enable input current v in = v en = 5.5v, i d = open 2.5 4 a i sd shutdown current v in = +5.5v, v en = 0v, i d = open measured on the v in pin (7) 0.01 1 a i shut-switch off state leakage current v in = +5.5v, v en = 0v, i d = short measured on v out (7) 0.01 1 a v in = +5.0v, i d = C100ma, v en = 1.5v 130 225 m ? v in = +4.5v, i d = C100ma, v en = 1.5v 135 235 m ? v in = +3.6v, i d = C100ma, v en = 1.5v 140 255 m ? v in = +2.5v, i d = C100ma, v en = 1.5v 170 315 m ? v in = +1.8v, i d = C100ma, v en = 1.5v 235 355 m ? r ds(on) p-channel drain to source on resistance v in = +1.7v, i d = C100ma, v en = 1.5v 260 375 m ? r shutdown turn-off resistance v in = +3.6v, i test = 1ma, v en = 0v mic94091/3/5 250 400 ? downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 4 m9999-033109-a electrical characteristics (dynamic) t a = 25c, bold values indicate C40c< t a < +85c, unless noted. symbol parameter condition min typ max units v in = +3.6v, id = C100ma, v en = 1.5v mic94090/1 0.4 1.5 s v in = +3.6v, id = C100ma, v en = 1.5v mic94092/3 200 740 1500 s t on_dly turn-on delay time v in = +3.6v, id = C100ma, v en = 1.5v mic94094/5 65 110 165 s v in = +3.6v, id = C100ma, v en = 1.5v mic94090/1 0.4 1.5 s v in = +3.6v, id = C100ma, v en = 1.5v mic94092/3 400 790 1500 s t on_rise turn-on rise time v in = +3.6v, id = C100ma, v en = 1.5v mic94094/5 65 120 175 s t off_dly turn-off delay time v in = +3.6v, id = C100ma, v en = 1.5v 60 200 ns t off_fall turn-off fall time v in = +3.6v, id = C100ma, v en = 1.5v 10 100 ns notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. with backside thermal contact to pcb. see thermal considerations section. 4. pulse width <300 s with < 2% duty cycle. 5. continuous body diode current co nduction (reverse conduction, i.e. v out to v in ) is not recommended. 6. devices are esd sensitive. handling precaut ions recommended. hbm (human body model), 1.5k ? in series with 100pf. 7. measured on the mic94090ymt. downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 5 m9999-033109-a typical characteristics downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 6 m9999-033109-a typical characteristics downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 7 m9999-033109-a functional characteristics mic94090 downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 8 m9999-033109-a mic94091 downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 9 m9999-033109-a mic94092 downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 10 m9999-033109-a mic94093 downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 11 m9999-033109-a mic94094 downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 12 m9999-033109-a mic94095 downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 13 m9999-033109-a application information power dissipation considerations as with all power switches, the ultimate current rating of the switch is limited by t he thermal properties of the package and the pcb it is mounted on. there is a simple, ohms law type relationship between thermal resistance, power dissipation and temperature which are analogous to an electrical circuit: figure 1. electrical circuit from this simple circuit we can calculate vx if we know isource, vz and the resistor values, rxy and ryz using the equation: () vz ryz rxy isource vx + + ? = thermal circuits can be considered using these same rules and can be drawn similarly replacing current sources with power dissipation (in watts), resistance with thermal resistance (in o c/w) and voltage sources with temperature (in o c). figure 2. thermal equivalent circuit now replacing the variables in the equation for vx, we can find the junction temperature (tj) from power dissipation, ambient temperature and the known thermal resistance of the pcb (r ca ) and the package (r ja ). () amb ca jc diss j t r r p t + + ? = (1) it is this equation that is used to determine the graphs on page 7. p diss is calculated as (i switch 2 x r swmax ). r jc is found in the operating ratings section of the datasheet and r ca (the pcb thermal resistance) values for various pcb copper areas can be taken from designing with low dropout voltage regulators (1) available from the micrel website (ldo application hints). example: a switch is intended to drive a 500ma load and is placed on a printed circuit board which has a ground plane area of at least 25mm square. the voltage source is a li-ion battery with a lower operating threshold of 3v and the ambient temperature of the assembly can be up to 50 o c. summary of variables: i sw = 0.5a vin = 3v to 4.2v tamb = 50 o c r jc = 60 o c/w from datasheet (p. 3) r ca = 53 o c/w read from graph in fig. 3 figure 3. excerpt from the ldo book (1) p diss = i sw 2 x r swmax the worst case switch resistance (r swmax ) at the lowest vin of 3v is not available in the datasheet, so the next lower value of vin is used. r swmax @ 2.5v = 315m if this were a figure for worst case r swmax for 25 o c, an additional consideration is to allow for the maximum junction temperature of 125 o c, the actual worst case resistance in this case will be 30% higher (see r ds(on) variance vs. temperature graph). r swmax @ 2.5v (@ 125c) = 315 x 1.3 = 410m therefore junction temperature (t j ): t j = 0.5 2 x 0.41 x (60+53) + 50 from (eqn. 1) t j = 62 o c this is well below the maximum 125 o c. downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 14 m9999-033109-a package information 6-pin sc-70 (c6) downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 15 m9999-033109-a 4-pin thin mlf ? (mt) downloaded from: http:///
micrel, inc. mic94090/1/2/3/4/5 march 2009 16 m9999-033109-a landing pattern optional for maximum thermal performance. heatsink should be connected to gnd plane of pcb for maximum thermal performance. suggested land pattern 4-pin thin mlf ? (mt) 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 belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product can reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended 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 significan t injury to the user. a purchasers use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2009 micrel, incorporated. downloaded from: http:///

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