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mic2033 high-accuracy, high-side, fixed current limit power switch micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com august 2012 m9999-082012-a general description the mic2033 is a high-side mosfet power distribution switch providing in creased system reli ability utilizing 5% current limit accuracy. the mic2033 has an operating input voltage range from 2.5v to 5.5v, is internally current limited and has thermal shutdown to protect the device and system. the mic2033 is offered with either active-high or active-low logic level enable input controls, has an open drain fault status output flag with a built-in 32ms delay t hat asserts low during over current or thermal shutdo wn conditions. the mic2033 is available in several different fixed current limit options: 0.5a, 0.8a, 1a, and 1.2a. a capacitor adjustable soft-start circuit minimizes inrush current in applications where high capacitive loads are used. the mic2033 is offered in both 6-pin sot-23 and 6-pin 2mm x 2mm thin dfn packages. the mic2033 has an operating junction temperature range of ? 40c to +125c. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? 5% current limit accuracy ? input supply range from 2.5v to 5.5v ? low quiescent current: 100a typical (switch on) ? 75m ? typical r ds(on) at 5v ? current limit options: 0.5a, 0.8a, 1a, and 1.2a ? soft-start control via an external capacitor ? undervoltage lockout (uvlo) ? fast response time (10s) to short circuit loads ? fault status output flag ? logic controlled enable (active-high, active-low) ? thermal shutdown ? pin compatible with mic2005 ? 6-pin 2mm ? 2mm thin dfn and 6-pin sot-23 packages ? junction temperature range from ? 40c to +125c applications ? usb peripherals and usb 2.0/3.0 compatible ? dtv/stb ? notebooks and consumer electronics ? general purpose power distribution ____________________________________________________________________________________________________________ typical application
micrel, inc. mic2033 august 2012 2 m9999-082012-a ordering information part number top mark current limit enable package mic2033-05aym6 35a 0.5a active high sot-23-6l MIC2033-05BYM6 35b 0.5a active low sot-23-6l mic2033-05aymt 3a5 0.5a active high 6-pin 2mm x 2mm thin dfn mic2033-05bymt 3b5 0.5a active low 6-pin 2mm x 2mm thin dfn mic2033-55aym6* 55a 0.55a active high sot-23-6l mic2033-55aymt* 5a5 0.55a active high 6-pin 2mm x 2mm thin dfn mic2033-08aym6 38a 0.8a active high sot-23-6l mic2033-08bym6 38b 0.8a active low sot-23-6l mic2033-08aymt 3a8 0.8a active high 6-pin 2mm x 2mm thin dfn mic2033-08bymt 3b8 0.8a active low 6-pin 2mm x 2mm thin dfn mic2033-10aym6 31a 1.0a active high sot-23-6l mic2033-10bym6 31b 1.0a active low sot-23-6l mic2033-10aymt 3a1 1.0a active high 6-pin 2mm x 2mm thin dfn mic2033-10bymt 3b1 1.0a active low 6-pin 2mm x 2mm thin dfn mic2033-12aym6 32a 1.2a active high sot-23-6l mic2033-12bym6 32b 1.2a active low sot-23-6l mic2033-12aymt 3a2 1.2a active high 6-pin 2mm x 2mm thin dfn mic2033-12bymt 3b2 1.2a active low 6-pin 2mm x 2mm thin dfn notes: 1. under bar symbol ( _ ) may not be to scale. 2. thin dfn is a green rohs compliant package. lead finish is nipdau. mold compound is halogen free. 3. * contact micrel for availability.
micrel, inc. mic2033 august 2012 3 m9999-082012-a pin configuration sot-23 6-lead (m6) top view 2mm x 2mm 6-pin thin dfn (mt) top view notes: 1. thin dfn = pin 1 identifier. pin description pin number sot-23-6l 6-pin 2mmx2mm thin dfn pin name pin function 1 6 vin input: power switch and logic supply input. 2 5 gnd ground: input and output return pin. 3 4 en enable (input): logic compatible, enable co ntrol input that allows turn-on/-off of the switch. do not leave the en pin floating. 4 3 fault/ fault status flag (output): active-low, open-drain output. a logic low state indicates an over current or thermal shutdo wn condition. an over current condition must last longer than t fault/ in order to assert fault/. a pull-up resistor (10k ? recommended) to an external supply is required. 5 2 cslew slew rate control: adjustable soft-start input. adding a small value capacitor from cslew to vin slows the turn-on time of the power mosfet. 6 1 vout switch output: power switch output. ? ep epad exposed pad: exposed pad on bottom si de of package. connect to electrical ground for optimum thermal dissipation.
micrel, inc. mic2033 august 2012 4 m9999-082012-a absolute maximum ratings (1) v in to gnd....................................................... ? 0.3v to +6v v out to gnd ...................................................... ? 0.3v to v in v cslew to gnd................................................. ? 0.3v to +6v v en to gnd...................................................... ? 0.3v to +6v v fault/ to gnd................................................. ? 0.3v to +6v fault/ current (i fault/ ) ..............................................25ma maximum power dissipation (p d ) .............internally limited lead temperature (solde ring, 10 se c.)...................... 260c storage temperature (t s )......................... ? 65c to +150c esd rating (2) hbm ......................................................................... 3kv mm .........................................................................300v operating ratings (3) supply voltage (v in )..................................... +2.5v to +5.5v v en , v fault/ ................................................... ? 0.3v to +5.5v v cslew , v out ...................................................... ? 0.3v to v in ambient temperature range (t a ) .............. ?40c to +85c junction temperature (t j ) ........................ ?40c to +125c package thermal resistance sot-23-6 ( ? ja ) ..............................................177.2c/w 6-pin 2mm ? 2mm dfn ( ? ja ) .............................90c/w electrical characteristics (4) v in = v en = 5v; c in = 1f; c cslew = 0.1f; c out = 1f; t j = 25c. bold values indicate ?40c t j +125c, unless noted. symbol parameter condition min. typ. max. units power supply input v in input voltage range 2.5 5.5 v v in rising 2.0 2.25 2.5 v v uvlo input supply under-voltage lockout threshold v in falling 1.9 2.15 2.4 v uvlohys input supply under-voltage lockout threshold hysteresis v in rising or v in falling 100 mv active high enable (a): v en = 0v, v in = 5v switch off (i out = 0a) active low enable (b): v en = v in = 5v 0.75 5 active high enable (a): v en = 1.5v, v in = 5v i dd supply current switch on (i out = 0a) active low enable (b): v en = 0v, v in = 5v 100 300 a power mosfet v in = 2.5v, i out = 350ma 100 177 v in = 3.3v, i out = 350ma 85 145 r ds(on) switch on-resistance v in = 5v, i out = 350ma 75 125 m ? i lkg output leakage current switch off, v out = 0v 0.22 15 a current limit mic2033-05xxxx, v out = 0.8 x v in 0.475 0.50 0.525 mic2033-55xxx, v out = 0.8 x v in (5) 0.517 0.550 0.578 mic2033-08xxxx, v out = 0.8 x v in 0.76 0.80 0.84 mic2033-10xxxx, v out = 0.8 x v in 0.95 1.00 1.05 i limit current limit mic2033-12xxxx, v out = 0.8 x v in 1.14 1.20 1.26 a i/o logic low 0.5 v en enable voltage logic high 1.5 v
micrel, inc. mic2033 august 2012 5 m9999-082012-a i en enable input current 0v v en 5v 1 a electrical characteristics (4) (continued) symbol parameter condition min. typ. max. units r fault/ fault/ output resistance i out = 10ma 25 ? i fault/_off fault/ off current v fault/ = v in 10 a i cslew cslew input current v cslew = v in 0.6 a thermal protection t sd thermal shutdown threshold t j rising 157 c t sdhys thermal shutdown hysteresis 15 c timing specifications (ac parameters) t rise output turn-on rise time (6) r load = 10 ? ; c out = 1f 700 s t fall output turn-off fall time (6) v en = off; r load = 10 ? ; c out = 1f 32 s t on_dly output turn-on delay (6) r load = 10 ? ; c out = 1f 700 s t off_dly output turn-off delay (6) r load = 10 ? ; c out = 1f 5 s t sc_resp short circuit response time (6) v out = 0v (short circuit) 10 s t fault/ over-current fault response delay time (6) 16 32 49 ms notes: 1. exceeding the absolute maximum rating may damage the device. 2. devices are esd sensitive. handling precaut ions recommended. human body model (hbm), 1.5k ? in series with 100pf. 3. the device is not guaranteed to function outside its operating rating. 4. specification for packaged product only. 5. preliminary. 6. see timing diagrams (figures 1-3).
micrel, inc. mic2033 august 2012 6 m9999-082012-a timing diagrams vout 0 0 t rise t fall t v 10% 10% 90% 90% en figure 1. output rise/fall time vout en 0 0 t on_dly t off_dly t v 10% 50% 50% 90% figure 2. turn-on/off delay
micrel, inc. mic2033 august 2012 7 m9999-082012-a figure 3. short circuit response time and over current fault flag delay
micrel, inc. mic2033 august 2012 8 m9999-082012-a typical characteristics input supply current vs. temperature 0 25 50 75 100 125 150 175 200 -50 -25 0 25 50 75 100 125 temperature (c) supply current (a) v in = 5v i out = 0ma vin off current vs. temperature 0.00 0.25 0.50 0.75 1.00 1.25 1.50 -50-25 0 25 50 75100125 temperature (c) supply off current (a) v in = 5v v en = off i out = 0ma undervoltage lockout vs. temperature 1.50 1.75 2.00 2.25 2.50 -50 -25 0 25 50 75 100 125 temperature (c) uvlo threshold (v) v in falling v in rising r ds(on) vs. temperature 0 25 50 75 100 125 -50-25 0 255075100125 temperature (c) r ds (on) (m ? ) v in = 5v i out = 350ma mic2033-05xx r ds(on) vs. temperature 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 temperature (c) r ds (on) (m ? ) v in = 5v i out = 350ma mic2033-12xx r ds(on) vs. output current 0 25 50 75 100 125 0 100 200 300 400 500 output current (ma) r ds (on) (m ? ) v in = 5v t a = 25c mic2033-05xx r ds(on) vs. output current 0 25 50 75 100 125 0 100 200 300 400 500 output current (ma) r ds (on) (m ? ) v in = 3.3v t a = 25c mic2033-05xx r ds(on) vs. output current 0 25 50 75 100 125 0.00 0.25 0.50 0.75 1.00 1.25 output current (a) r ds (on) (m ? ) v in = 5v t a = 25c mic2033-12xx r ds(on) vs. output current 0 25 50 75 100 125 0.00 0.25 0.50 0.75 1.00 1.25 output current (a) r ds (on) (m ? ) v in = 3.3v t a = 25c mic2033-12xx
micrel, inc. mic2033 august 2012 9 m9999-082012-a typical characteristics (continued) current limit vs. temperature 400 450 500 550 600 -50-250255075100125 temperature (c) current limit (ma) v in = 5v v out = 4v mic2033-05xx current limit vs. temperature 0 200 400 600 800 1000 1200 -50 -20 10 40 70 100 130 temperature (c) current limit (ma) v in = 5v v out = 4v mic2033-08xx current limit vs. temperature 0.00 0.25 0.50 0.75 1.00 1.25 1.50 -50 -20 10 40 70 100 130 temperature (c) current limit (a) v in = 5v v out = 4v mic2033-10xx current limit vs. temperature 1.10 1.15 1.20 1.25 1.30 -50 -25 0 25 50 75 100 125 temperature (c) current limit (a) v in = 5v v out = 4v mic2033-12xx vin - vout vs. output current 0 10 20 30 40 50 0 100 200 300 400 500 output current (ma) vin - vout (mv) v in = 5v t a = 25c mic2033-05xx vin - vout vs. output current 0 25 50 75 100 125 0.00 0.25 0.50 0.75 1.00 1.25 output current (a) vin - vout (mv) v in = 5v t a = 25c mic2033-12xx fault/ pin resistance vs. temperature 0 5 10 15 20 25 -50 -25 0 25 50 75 100 125 temperature (c) fault/ pin resistance ( ? ) v in = 5v i flag = 10ma fault/ response time vs. temperature 0 10 20 30 40 50 -50 -25 0 25 50 75 100 125 temperature (c) fault/ response time (ms) v in = 5v mic2033-xxxx
micrel, inc. mic2033 august 2012 10 m9999-082012-a functional characteristics
micrel, inc. mic2033 august 2012 11 m9999-082012-a functional characteristics (continued)
micrel, inc. mic2033 august 2012 12 m9999-082012-a functional diagram figure 4. mic2033 block diagram
micrel, inc. mic2033 august 2012 13 m9999-082012-a functional description the mic2033 is a high-side mosfet power distribution switch providing increased sy stem reliability utilizing 5% current limit accuracy. the mic2033 has an operating input voltage range from 2.5v to 5.5v and is internally current limited and has thermal shutdown that protects the device and system. soft-start soft-start reduces the power supply input surge current at startup by cont rolling the output voltage rise time. the input surge appears while the output capacitor is charged up. a slower output ri se time will draw a lower input surge current. during soft-start, an internal current sink discharges the external capacitor at cslew to ground to control the ramp of the output voltage. the output voltage rise time is dependent upon the value of c cslew , the input voltage, output voltage, and the current limit. the value of the cslew external capacitor is recommended to be in the range of 0.1f to 1f. input capacitor a 1f to 10f ceramic input capacitor is recommended for most applications. the input capacitor must be placed on the same side of the board and next to the mic2033 to minimize the voltage ringing during transient and short circuit conditions. it is also recommended to use two vias for each end of the capacitor to connect to the power and ground plane. x7r or x5r dielectric ceramic capacitors are recommended because of their temperature performance. x7r-type capacitors change capacitance by 15% over their operat ing temperature range and are the most stable type of ceramic capacitors. z5u and y5v dielectric capacitors change value by as much as 50% and 60% respectively over their operating temperature ranges. to use a ceramic chip capacitor with y5v dielectric, the value must be much higher than an x7r ceramic or a tantalum capacitor to ensure the same capacitance value over the operating temperature range. output capacitor the output capacitor type and placement criteria are the same as the input capacitor. see the input capacitor section for a detailed description. enable the mic2033 offers either an active high or active low enable input (en) that allows on/off control of the switch output. the current through the device reduces to near ?zero? when the device is shutdown, with only microamperes of leakage current. the en input may be directly tied to v in or driven by a voltage that is equal to or less than v in , but do not leave this pin floating. current limit the mic2033 is available with four fixed current limit settings: 0.5a, 0.8a, 1a, and 1.2a. if the output current exceeds the set current limit, then the mic2033 switch will enter constant current limit mode. the maximum allowable current limit may be less than the full specified and/or expected current if the mic2033 is not mounted on a circuit board with sufficiently low thermal resistance. the mic2033 responds within 10s to short circuits to limit the output current and also provides an output fault flag that will assert (low) for an over current condition that lasts longer than 32ms. thermal design to help reduce the thermal resistance, the epad (underneath the ic) should be soldered to the pcb ground and the placement of thermal vias either underneath or near the epad is highly recommended. thermal design requires the following application- speci c parameters: ? maximum ambient temperature (t a ) ? output current (i out ) ? input voltage (v in ) ? current limit (i limit ) when the mic2033 is in constant current limit mode, it may exceed the over temperature threshold. if this occurs, the over temperatur e condition will shut down the mic2033 switch and t he fault status flag will go active (assert low). after t he switch cools down, it will turn on again. the mic2033 power dissipation can be maximized by either lowering the thermal resistance on the exposed pad (only the dfn package has an exposed pad) on the printed circ uit board, or by limiting the maximum allowable ambient temperature. thermal measurements it is always wise to measure the ic?s case temperature to make sure that it is with in its operating limits. although this might seem like a very elementary task, it is very easy to get erroneous results. the most common mistake is to use the standard thermal couple that comes with the thermal voltage meter. this thermal couple wire gauge is large, typically 22 gauge, and behaves like a heatsink, resulting in a lower case measurement. there are two suggested methods for measuring the ic case temperature: a thermal couple or an infrared thermometer. if a thermal couple is used, it must be constructed of 36 gauge wire or higher to minimize the wire heatsinking effect. in addition, the thermal couple tip must be covered in either thermal grease or thermal glue
micrel, inc. mic2033 august 2012 14 m9999-082012-a to make sure that the thermal couple junction is making good contact to the case of the ic. this thermal couple from omega (5sc-tt-k-36-36) is adequate for most applications. to avoid this messy thermal couple grease or glue, an infrared thermometer is recommended. most infrared thermometers? spot size is too large for an accurate reading on small form factor ics. however, an ir thermometer from optris has a 1mm spot size, which makes it ideal for the 3mm ? 3mm dfn package. also, get the optional stand. the stand makes it easy to hold the beam on the ic for long periods of time.
micrel, inc. mic2033 august 2012 15 m9999-082012-a evaluation board schematic bill of materials item part number manufacturer description qty. c1608x5r0j105k tdk (1) c1, c2 06036d105kat2a avx (2) 1f/6.3v ceramic capacitor, x5r, 0603 2 06033c104kat2a tdk c3 c1608x7r1e104k avx 0.1f/25v ceramic capacitor, x7r, 0603 1 r1, r2 crcw060310k0fkea vishay/dale (3) 10k ? , film resistor, 0603, 1% 2 u1 mic2033-xxxymt micrel (4) high-accuracy, high-side, fixed current limit power switch 1 notes: 1. tdk: www.tdk.com . 2. avx.: www.avx.com . 3. vishay: www.vishay.com . 4. micrel, inc.: www.micrel.com
micrel, inc. mic2033 august 2012 16 m9999-082012-a pcb layout (mic2033-xxxymt evaluation board) mic2033-xxxymt evaluation board ? top layer mic2033-xxxymt evaluation board ? bottom layer
micrel, inc. mic2033 august 2012 17 m9999-082012-a pcb layout (mic2033-xxx ym6 evaluation board) mic2033-xxxym6 evaluation board ? top layer mic2033-xxxym6 evaluation board ? bottom layer
micrel, inc. mic2033 august 2012 18 m9999-082012-a package information 6-pin 2mm x 2mm thin dfn (mt)
micrel, inc. mic2033 august 2012 19 m9999-082012-a package information (continued) sot23-6l (m6)
micrel, inc. mic2033 august 2012 20 m9999-082012-a 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. ? 2012 micrel, incorporated.

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