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mic94080/1/2/3/4/5 67m ? r dson 2a high side load switch in 0.85mm x 0.85mm thin mlf ? package mlf and micro leadframe is a registered trademark 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 january 2011 m9999-013111-d general description the mic94080/1/2/3/4/5 is a fami ly of high-side load switches designed to operate from 1.7v to 5.5v input voltage. the load switch pass element is an internal 67m ? r dson p-channel mosfet which enables the device to support up to 2a of continuous current. additionally, the load switch supports 1.5v logic level control and shutdown features in a tiny 0.85mm x 0.85mm 4-pin thin mlf ? package. the mic94080 and mic94081 feature rapid turn on. the mic94082 and mic94083 provide a slew rate controlled soft- start turn-on of 800s, while the MIC94084 and mic94085 provide a slew rate controlled soft-start turn-on of 120s. the soft-start feature is provided to prevent an in-rush current event from pulling down t he input supply voltage. the mic94081, mic94083, and mic94085 feature an active load discharge circuit which switches in a 250 ? load when the switch is disabled to automatica lly discharge a capacitive load. an active pull-down on the enable input keeps the mic94080/1/2/3/4/5 in a default off state until the enable pin is pulled above 1.25v. internal le vel 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 mic94080/1/2/3/4/5 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 provide low quiescent current and low shutdown current to maximize battery life. datasheets and support documentation can be found on micrel?s web site at: www.micrel.com. features ? 0.85mm x 0.85mm space saving 4-pin thin mlf ? package ? 1.7v to 5.5v input voltage range ? 2a continuous operating current ? 67m ? r dson ? internal level shift for cmos/ttl control logic ? ultra low quiescent current ? micro-power shutdown current ? soft-start: mic94082/3 (800s), MIC94084/5 (120s) ? load discharge circuit: mic94081, mic94083, mic94085 ? ultra fast turn off time ? junction operating temperature from -40oc to +125oc applications ? cellular phones ? portable navigation devices (pnd) ? personal media players (pmp) ? ultra mobile pcs ? portable instrumentation ? other portable applications ? pdas ? gps modules ? industrial and datacomm equipment ____________________________________________________________________________________________________________________ typical application level shift and slew rate control load en v in gnd v out mic94080 (ultra fast turn on) mic94082 (800s soft-start) MIC94084 (120s soft-start) level shift slew rate control & load discharge load en v in gnd v out mic94081 (ultra fast turn on with auto-discharge) mic94083 (800s soft-start with auto-discharge) mic94085 (120s soft-start with auto-discharge)
micrel, inc. mic94080/1/2/3/4/5 january 2011 2 m9999-013111-d ordering information part number part marking fast turn on soft-start load discharge package (1) mic94080yft c1 ? 4-pin 0.85mm x 0.85mm thin mlf ? mic94081yft c2 ? ? 4-pin 0.85mm x 0.85mm thin mlf ? mic94082yft c5 800s 4-pin 0.85mm x 0.85mm thin mlf ? mic94083yft c7 800s ? 4-pin 0.85mm x 0.85mm thin mlf ? MIC94084yft c0 120s 4-pin 0.85mm x 0.85mm thin mlf ? mic94085yft 1c 120s ? 4-pin 0.85mm x 0.85mm thin mlf ? notes: 1. thin mlf ? is a green rohs-compliant package. lead fini sh is nipdau. mold compound is halogen free. pin configuration 4-pin (0.85mm x 0.85mm) thin mlf ? (top view) example showing orientation of part marking (bottom view) pin description pin number pin name pin function 1 v out drain of p-channel mosfet. 2 gnd ground should be connect ed to electrical ground. 3 v in source of p-channel mosfet. 4 en enable (input): active-high cmos/ttl c ontrol input for switch. internal ~2m pull down resistor. output will be off if this pin is left floating.
micrel, inc. mic94080/1/2/3/4/5 january 2011 3 m9999-013111-d absolute maximum ratings (1) input voltage (v in ) ........................................................ +6v enable voltage (v en ) ................................................... +6v continuous drain current (i d ) (3) t a = 25c .............................................................. 2a t a = 85c ........................................................... 1.5a pulsed drain current (i dp ) (4) ...................................... 6.0a continuous diode current (i s ) (5) .............................. ?50ma storage temperature (t s ) ....................... ?55c to +150c esd rating ? hbm (6) .................................................... 3kv operating ratings (2) input voltage (v in )....................................... +1.7 to +5.5v junction temperature (t j ) .....................?40c to +125c package thermal resistance 0.85mm x 0.85mm thin mlf ? ( ja ) .......................................................140c/w ( jc ) .........................................................85c/w electrical characteristics t a = 25c, bold values indicate ?40c< 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 = ?250a 0.4 1.25 v v in = v en = 5.5v, i d = open measured on v in mic94080/1 0.1 1 i q quiescent current v in = v en = 5.5v, i d = open measured on v in mic94082/3/4/5 8 15 a i en enable input current v in = v en = 5.5v, i d = open 2.8 4 a i shut-q quiescent current (shutdown) v in = +5.5v, v en = 0v, i d = open measured on v in (7) 0.02 1 a i shut-switch off state leakage current v in = +5.5v, v en = 0v, i d = short measured on v out , (7) 0.02 1 a v in = +5.0v, i d = ?100ma, v en = 1.5v 67 115 m ? v in = +4.5v, i d = ?100ma, v en = 1.5v 70 130 m ? v in = +3.6v, i d = ?100ma, v en = 1.5v 80 165 m ? v in = +2.5v, i d = ?100ma, v en = 1.5v 110 225 m ? v in = +1.8v, i d = ?100ma, v en = 1.5v 175 350 m ? r ds(on) p-channel drain to source on resistance v in = +1.7v, i d = ?100ma, v en = 1.5v 200 375 m ? r shutdown turn-off resistance v in = +3.6v, i test = 1ma, v en = 0v mic94081/3/5 250 400 ? 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 thermal contact to pcb. s ee thermal considerations section. 4. pulse width <300s 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 mic94080yft.
micrel, inc. mic94080/1/2/3/4/5 january 2011 4 m9999-013111-d electrical characteristics (dynamic) t a = 25c, bold values indicate ?40c< t a < +85c, unless noted. symbol parameter condition min typ max units v in = +3.6v, i d = ?100ma, v en = 1.5v mic94080, mic94081 0.40 1.5 s v in = +3.6v, i d = ?100ma, v en = 1.5v mic94082, mic94083 200 600 1500 s t on_dly turn-on delay time v in = +3.6v, i d = ?100ma, v en = 1.5v MIC94084, mic94085 65 110 165 s v in = +3.6v, i d = ?100ma, v en = 1.5v mic94080, mic94081 0.4 1.5 s v in = +3.6v, i d = ?100ma, v en = 1.5v mic94082, mic94083 400 800 1500 s t on_rise turn-on rise time v in = +3.6v, i d = ?100ma, v en = 1.5v MIC94084, mic94085 65 120 175 s t off_dly turn-off delay time v in = +3.6v, i d = ?100ma, v en = 0v 60 200 ns t off_fall turn-off fall time v in = +3.6v, i d = ?100ma, v en = 0v 20 100 ns
micrel, inc. mic94080/1/2/3/4/5 january 2011 5 m9999-013111-d typical characteristics mic94080/1/2/3/4/5 mic94080/1/2/3/4/5 mic94080/1/2/3/4/5 mic94080/1 mic94082/83/84/85 mic94080/81 mic94082/3/4/5 mic94081/2/3/4/5 mic94080/1
micrel, inc. mic94080/1/2/3/4/5 january 2011 6 m9999-013111-d typical characteristics mic94082/3 mic94080/1 mic94082/3 MIC94084/5 MIC94084/5 mic94080/1/2/3/4/5 mic94080/1/2/3/4/5
micrel, inc. mic94080/1/2/3/4/5 january 2011 7 m9999-013111-d functional characteristics mic94080
micrel, inc. mic94080/1/2/3/4/5 january 2011 8 m9999-013111-d mic94081
micrel, inc. mic94080/1/2/3/4/5 january 2011 9 m9999-013111-d mic94082
micrel, inc. mic94080/1/2/3/4/5 january 2011 10 m9999-013111-d mic94083
micrel, inc. mic94080/1/2/3/4/5 january 2011 11 m9999-013111-d MIC94084
micrel, inc. mic94080/1/2/3/4/5 january 2011 12 m9999-013111-d mic94085
micrel, inc. mic94080/1/2/3/4/5 january 2011 13 m9999-013111-d application information power switch soa the safe operating area (soa) curve represents the boundary of maximum safe operating current and maximum safe operating junction temperature. figure 1. soa graph the curves above show the soa for various v in ?s mounted on a typical 1 layer, 1 square inch copper board. power dissipation considerations as with all power switches, the current rating of the switch is limited mostly 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 2. simple 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 by replacing current sources with power dissipation (in watts), resistance with thermal resistance (in oc/w) and voltage sources with temperature (in oc). figure 3. simple thermal circuit now replacing the variables in the equation for vx, we can find the junction temperature (t j ) from power dissipation, ambient temperature and the known thermal resistance of the pcb (r ca ) and the package (r jc ). t j = p diss x (r jc + r ca ) + t a p diss is calculated as i switch 2 x r swmax . r jc is found in the operating ratings secti on of the datasheet and r ca (the pcb thermal resistance) values for various pcb copper areas is discussed in the document ?designing with low dropout voltage regulators? available from the micrel website (ldo application hints). example: a switch is intended to drive a 1a load and is placed on a printed circuit board which has a ground plane area of at least 25mm by 25mm (625mm 2 ). 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 50oc. summary of variables: i sw = 1a v in = 3v to 4.2v t a = 50 o c r jc = 85oc/w r ca = 53oc/w read from graph in figure 4 figure 4. excerpt from the ldo book
micrel, inc. mic94080/1/2/3/4/5 january 2011 14 m9999-013111-d p diss = i sw 2 x r swmax the worst case switch resistance (r swmax ) at the lowest v in of 3v is not available in the datasheet, so the next lower value of v in is used. r swmax @ 2.5v = 200m if this were a figure for worst case r swmax for 25oc, an additional consideration is to allow for the maximum junction temperature of 125oc, the actual worst case resistance in this case can be 30% higher (see r dson variance vs. temperature graph). however, 200m ? is the maximum over temperature. therefore: t j = 1 2 x 0.2 x (85+53) + 50 t j = 78oc this is below the maximum 125oc.
micrel, inc. mic94080/1/2/3/4/5 january 2011 15 m9999-013111-d package information 4-pin (0.85mm x 0.85mm) thin mlf ? (ft)
micrel, inc. mic94080/1/2/3/4/5 january 2011 16 m9999-013111-d recommended land pattern 4-pin (0.85mm x 0.85mm) thin mlf ? (ft) 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 micrel makes no representations or warranties with respect to t he accuracy or completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether expre ss, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right. 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 purchaser?s use or sale of micrel produc ts for use in life support app liances, 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. ? 2008 micrel, incorporated.

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