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MIC33163/4 4mhz, 1a, buck regulator with integrated inductor and hyperlight load ? g eneral description the MIC33163/4 is a highly - efficient synchronous buck regulator with integrated inductor which provides the optimal trade - off between footprint and efficiency. the MIC33163/4 operates at 4mhz switching frequency and provides up to 1a output current. in addition, t he 100% duty cycle and hyperlight load ? ( hll ) mode - of - operation delivers very - high efficiency at light loads and ultra - fast transient response which makes t he MIC33163/4 perfectly suited for any space con strain ed application and great alternative for low dropout regulators . an additional benefit of this proprietary architecture is very low output ripple voltage throughout the entire load range with the use of small output capacitors. the MIC33163/4 provide s a small compa ct total solution size of 4.6 mm 7mm with very few tiny external components. at higher loads, the MIC33163/4 provides a constant switching frequency around 4mhz while achieving peak efficien cies up to 93%. it also includes under - voltage lockout to ensure proper operation under power - sag conditions, internal soft - start to reduce inrush current, fold - back current limit, power good (pg) indicator and thermal shutdown. the MIC33163/4 is available in 20 - pin 2.5mm 3.0mm 1.1mm qfn package with an operating junction temperature range from ? 40 c to +125 c. datasheets and support documentation are available on micrel?s website at: www.micrel.com . features ? integrated mosfets and inductor ? 100% duty cycle ? 4mhz pwm operation in continuous mode ? 1a output current ? low output voltage ripple ? 85% typical efficiency at 1ma , up to 93% peak efficiency ? ultra - fast transient response ? advanced copper lead frame design pro vides superior thermal performance ? low - radiated emission (emi) per en55022, class b ? adjustable output voltage 0.7v to 5v ? thermal - shutdo wn and current - limit protection ? configurable soft - start with pre - bias start - up capability ? auto d ischarge of 180 (mic33164 only) ? l ow profile 2.5mm 3.0mm 1.1mm qfn packages ? 0.1a shutdown current ? 33a quiescent current applications ? 5v p oint - of - l oad ( pol ) ? low - voltage distributed power systems ? space - constrained applications ? portable devices ? ssd storage systems ? digital cameras typical application 10 20 30 40 50 60 70 80 90 100 10 100 1000 efficiency (%) output current(ma) efficiency vs. output current v in = 5v v out = 1.8v v out = 2.5v v out =3.3v hyperlight load is a registered trademark of micrel, 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 may 22, 2014 revision 1.1
micrel, inc. MIC33163/4 ordering information part number output voltage auto discharge junction temperature range package ( 1 , 2 ) MIC33163ygj adj no ? 40 c to + 12 5 c 20- pin 2.5mm 3mm qfn mic33 1 64ygj adj yes ? 40 c to + 12 5 c 20- pin 2.5mm 3mm qfn note: 1. q fn is a green, rohs - compliant package. mold compound is halogen free. 2. pb - free lead finish is matt e tin . p in configuration 2.5mm 3mm qfn (gj ) adjustable output voltage (top view) pin description pin number pin name pin function 1, 20 pvin power input voltage: connect a capacitor to pgnd to decouple the noise. 2, 8, 9 pgnd power ground. 3, 4, 5, 6, 7 sw switch (output): internal power mosfet output switches. disable pull - down 180 (mic33164 only). 10,11,12,13 vout inductor o utput. connect a capacitor to pgnd to filter the switcher output voltage 14 agnd analog ground: connect to central ground point where all high current paths meet (cin, cout, pgnd) for best operation. 15 avin analog input voltage: connect a capacitor to ground to decouple the noise. 16 ss soft - start: place a capacitor from ss pin to ground to program the soft start time. 17 pg power good: open drain output for the power good indicator. place a resistor between this pin and a voltage source to detect a power good condition. 1 8 fb feedback: connect a resistor divider from vout to agnd to set the output voltage. 19 en enable (input): logic high enables operation of the regulator. logic low will shut down the device. do not leave floating. may 22, 2014 2 revision 1.1
micrel, inc. MIC33163/4 absolute maximum ratings ( 3 ) supply voltage ( v in = v avin = v pvin ) .................. ? 0.3v to 6v power good voltage (v pg ) ................................ ? 0.3v to 6v output switch voltage (v sw ) ............................. ? 0.3v to 6v enable input voltage (v en ) .. .............................. ? 0.3v to v in junction temperature (t j ) ....................................... +150 c storage temperature range (t s ) ............. ? 65 c to +150 c lead temperature (soldering, 10s ) ............................ 260 c esd rating ( 5) ................................................. esd sensitive operating ratings ( 4 ) supply voltage (v in = v avin = v pvin ) ................. 2.7v to 5.5v enable input voltage (v en ) .. ?????????.0v to v in feedback voltage (v fb ) ...................................... 0.7v to v in junction temperature range (t j ) . ?. ? 40 c t j + 125 c thermal resistance 20- p in 2 .5 mm 3 mm q fn ( ja ) ........................ 5 0 c/w electrical characteristics ( 6 ) t a = 25c v in = v en = 3.6v; c out = 22 f unless otherwise specified. bold values indicate ? 40c t j + 12 5c, unless otherwise noted. parameter condition min. typ. max. units supply voltage range 2.7 5.5 v undervoltage lockout threshold (turn - on) 2.40 2.53 2.65 v undervoltage lockout hysteresis 75 mv quiescent current i out = 0ma , v sns > 1.2 v out nominal 33 55 a shutdown current v en = 0v; v in = 5.5v 0.1 2 a output voltage accuracy v in = 3.6v if v outnom < 2.5v, i load = 20ma ? 2.5 +2.5 % v in = 5 .5v if v outnom 2.5v, i load = 20ma feedback regulation voltage 0.68 2 0.7 0.7 17 v current limit v sns = 0.9 v outnom 2.5 3.3 a output voltage line regulation v in = 3.6v to 5.5v , i load = 20ma 0.3 %/v output voltage load regulation 20ma i load 1 a, v in = 3.6v 0.3 % 20ma i load 1 a, v in = 5.5 v 0.3 pwm switch on - resistance i sw = 100ma pmos 0.13 ? i sw = ? 100ma nmos 0.13 ? switching frequency i out = 120ma 4 mhz soft - start time v out = 90%, c ss = 1nf 1000 s soft - start current v ss = 0v 2.2 a power good threshold (rising) % of v nom 85 90 95 % notes: 3. exceeding the absolute maximum ratings may damage the device. 4. the device is not guaranteed to function outside its operating ratings. 5. devices are esd sensitive. handling precautions are recommended. human body model, 1.5k ? in series with 100pf. 6. specification for packaged product only. may 22, 2014 3 revision 1.1
micrel, inc. MIC33163/4 electrical characteristics ( 6 ) (continued) t a = 25c; v in = v en = 3.6v ; c out = 22 f unless otherwise specified. bold values indicate ? 40c t j + 12 5c, unless otherwise noted. parameter condition min. typ. max. units power good threshold hysteresis 7 % power good pull - down v sns = 90% v nominal , i pg = 1ma 60 200 mv enable threshold turn - on 0.5 0.8 1.2 v enable hysteresis 70 mv enable input current 0.1 2 a overt emperature shutdown 160 c overt emperature shutdown hysteresis 20 c sw pull - down r esistance (mic3 3164 only) v en = 0v 180 ? may 22, 2014 4 revision 1.1
micrel, inc. MIC33163/4 typical characteristics 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 efficency (%) output current(ma) efficiency vs. output current v out = 1.2v v in = 3.3v v out = 2.5v v out = 1.8v 10 20 30 40 50 60 70 80 90 100 10 100 1000 efficiency (%) output current(ma) efficiency vs. output current v in = 5v v out = 1.8v v out = 2.5v v out = 3.3v v out = 1.2v 1 10 100 1000 10000 100000 1000000 100 1000 10000 100000 1000000 rise time (s) css (pf) vout rise time vs. css v in = 3.6v 2.6 2.8 3 3.2 3.4 3.6 3.8 4 2.5 3 3.5 4 4.5 5 5.5 current limit (a) input voltage (v) current limit vs. input voltage 1.75 1.752 1.754 1.756 1.758 1.76 1.762 1.764 1.766 1.768 1.77 2.5 3 3.5 4 4.5 5 5.5 output voltage (v) input volatge (v) line regulation (high loads) 200ma 500ma 1a 0 100 200 300 400 500 600 700 800 900 1000 1100 20 40 60 80 100 120 max output current (ma) ambient temperature( c) max. output current vs. temperature v in = 5v v out = 1.8v v in =3.3v may 22, 2014 5 revision 1.1
micrel, inc. MIC33163/4 typical characteristics (continued) 1.72 1.73 1.74 1.75 1.76 1.77 1.78 0 20 40 60 80 100 120 140 output voltage (v) output current (ma) output voltage vs. output current (dcm) v in = 3.6v . .3 . .5 .6 . . 3 5 6 output voltage (v) output current (ma) output voltage vs. output current (ccm) v in = 3.6v 1.65 1.67 1.69 1.71 1.73 1.75 1.77 1.79 1.81 1.83 1.85 -40 -20 0 20 40 60 80 100 output voltage (v) temperature ( c) output voltage vs. temperature v in = 3.6v 82 83 84 85 86 87 88 89 90 91 92 2.5 3 3.5 4 4.5 5 5.5 pg threshold (% of vref) input voltage (v) pg threshold vs. input voltage pg rising pg falling . .6 . .5 .5 .5 .56 .5 .6 6 uvlo threshold (v) temperature ( c) uvlo threshold vs. temperature uvlo on uvlo off 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1 2.5 3 3.5 4 4.5 5 5.5 enable voltage (v) input voltage (v) enable thresholds vs. input voltage c ff = 1nf t case = 25 c v out = 2v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -40 -20 0 20 40 60 80 100 enable threshold (v) temperature ( c) enable threshold vs. temperature v in = 3.6v frequency (khz) output current (ma) switching frequency vs. output current v in = 3.6v v in = 5v .6 .65 .6 .65 . .5 . .5 . 6 feedback voltage (v) temperature ( c) feedback voltage vs. temperature v in =3.6v v out = 1.75v i out = 30ma may 22, 2014 6 revision 1.1
micrel, inc. MIC33163/4 typical characteristics (continued) 0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 -40 -20 0 20 40 60 80 100 120 shutdown current (a) temperature ( c) shutdown current vs. temperature v in = 3.6v may 22, 2014 7 revision 1.1
micrel, inc. MIC33163/4 functional characteristics may 22, 2014 8 revision 1.1
micrel, inc. MIC33163/4 functional characteristics (continued) may 22, 2014 9 revision 1.1
micrel, inc. MIC33163/4 functional characteristics (continued) may 22, 2014 10 revision 1.1
micrel, inc. MIC33163/4 functional diagram figure 1 . simplified mic 3 3163/4 functional block diagram ? may 22, 2014 11 revision 1.1
micrel, inc. MIC33163/4 functional description p vin the input supply ( p v in ) provides power to the internal mosfets for the switch - mode regulator . the pv in operating input voltage range of 2.7v to 5.5v so an input capacitor, with a minimum voltage rating of 6.3v, is recommended. due to the high switching speed, a minimum 2.2f bypass capacitor placed close to p v in an d the power ground (pgnd) pin is required . refer to the pcb layout r ecommendations section for details. avin analog vin (av in ) provides power to the internal control and analog supply circuitry. avin must be tied to pvin. careful layout should be considered to ensure that any high - frequency switching noise caused by pvin is reduced before reaching avin. a 1f capacitor as close as to avin as possible is recommended. refer to the pcb layout r ecommendat ions section for details. en/shutdown a logic high signal on the enable pin activates the output voltage of the device. a logic low signal on the enable pin deactivates the output and reduces supply current to 0.1a. when disabled the mic 3 3164 switches an internal load of 180 ? on the regulators switch node to discharge the output. the mic 3 3163/4 features external soft - start circuitry adjusted by the soft start (ss) pin, which reduces in - rush current and prevents the output voltage from overshooting at start up. do not leave the en pin floating. sw the switch (sw) connects to the controller end of integrated inductor. the other end of the inductor is connected to v out pin. due to the high - speed switching on this pin, the switch node should be not be connected. vout the output pin (vout) connects to the output of integrated inductor. the output capacitor should be connected from this pin to pgnd as close to the module as possible. the MIC33163/4 is rated for an output current of up to 1a. a 22 f capacitor is recommended for best performance. refer to the pcb layout r ecommendations section for details. agnd the analog ground (agnd) is the ground path for the biasing and control circuitry. the current loop for the signal ground should be separate from the power ground (pgnd) loop. refer to the pcb layout recommendations section for details. pgnd the power ground (pgnd) pin is the ground path for the high current in pwm mode. the current loop for the power ground should be as small as possible and separate from the analog ground (agnd) loop as applicable. refer to the pcb layout recommendations section for details. pg the power good (pg) pin is an open drain output which indicates logic high when the output voltage is typically above 9 0 % of its steady state voltage. a pull - up resistor of more than 5k ? should be connected from pg to v out . ss the soft - start (ss) pin is used to control the output voltage ramp - up time. setting c ss to 1nf sets the start - up time to the recommended minimum of approximately 575 s . the start - up tim e can be determined by equation 1: ss 3 ss c ) 10 ln( 10 250 t = fb this is the control input for programming the outpu t voltage. a resistor divider network is connected to this pin from the output and is compared to the internal 0.7v reference within the regulation loop. may 22, 2014 12 revision 1.1
micrel, inc. MIC33163/4 the output voltage can be programmed between 0.7v and 5 v using equation 2: ? ? ? ? ? ? + = r2 r1 1 v v ref out eq. 2 where: r1 is the top resistor, r2 is the bottom resistor. table 1 . example feedback resistor values v out r1 r2 1.2v 215k 301k 1.5v 301k 261k 1.8v 340k 215k 2.5v 274k 107k 3.3v 383k 102k 3.6v 422k 102k 5v 634k 102k may 22, 2014 13 revision 1.1
micrel, inc. MIC33163/4 application information the mic 3 3163/4 is a high - performance d c - to - dc step - down regulator offering a small solution size of 4.6mm 7 mm. supporting an output current up to 1 a inside a tiny 3 mm 2 .5 mm q fn package, the MIC33163/4 requires very few external components while meeting today?s miniature portable electronic device n eeds. using the hll switching scheme, the mic 3 3163/4 is able to maintain high efficiency throughout the entire load range while provid ing ultra - fast load transient response. the following sections provide additional device application information. input capacitor a 2.2f ceramic capacitor or greater should be placed close to the vin pin and pgnd pin for bypassing. a murata grm188r60j475k e19d , size 0603, 4.7f ceramic capacitor is recommended based upon performance, size and cost. a x5r or x7r temperature rating is recommended for the input capacitor. y5v temperature rating capacitors, aside from losing most of their capacitance over tempe rature, can also become resistive at high frequencies. this reduces their ability to filter out high - frequency noise. output capacitor the mic 3 3163/4 is designed for use with a 22 f or greater ceramic output capacitor. increasing the output capacitance wil l lower output ripple and improve load transient response but could also increase solution size or cost. a low equivalent series resistance (esr) ceramic output capacitor such as the tdk c1608x5r0j226m080ac , size 0603, 22f ceramic capacitor is recommended based upon performance, size and cost. both the x7r or x5r temperature rating capacitors are recommended. the y5v and z5u temperature rating capacitors are not recommended due to their wide variation in capacitance over temperature and increased resistanc e at high frequencies. compensation the mic 331 63/4 is designed to be stable with a 22 f ceramic (x5r) output capacitor. an external feedback capacitor of 15pf to 68pf is required for optimum regulation performance. 100% duty cycle low dropout operation the mic 331 63/4 enters 100% duty cycle when the input voltage gets close to the nominal output voltage, in this case the high - side mosfet switch is turned on 100% for one or more cycles. by decreasing the input voltage further the high - side mosfet switch turns on completely. in this case the small difference between vin and vout is determined by rdson and dcr of the inductor. this is extremely useful in battery - powered applications to accomplish longest operation time . efficiency considerations efficiency i s defined as the amount of useful output power, divided by the amount of power supplied , as shown in equation 3: 100 i v i v % efficiency in in out out = ? ? ? ? ? ? ? ? figure 2 . efficiency under load 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 efficency (%) output current(ma) efficiency vs. output current v out = 1.2v v in = 3.3v v out = 2.5v v out = 1.8v may 22, 2014 14 revision 1.1
micrel, inc. MIC33163/4 over 100ma, efficiency loss is dominated by mosfet r dson and inductor losses. higher input sup ply voltages will increase the gate - to - s ource threshold on the internal mosfets, thereby reducing the internal r dson . this improves efficiency by reducing dc losses in the device. hyperlight load (hll) mode mic 3 3163/4 uses a micrel - patented minimum on - and off - time proprietary control loop ( pcl) called hyperlight load (hll) . when the output voltage falls below the re gulation threshold, the error comparator begins a switching cycle that turns the pmos on and keeps it on for the duration of the minimum - on- time. this increases the output voltage. if the output voltage is over the regulation threshold, then the error comp arator turns the pmos off for a minimum - off - time until the output drops below the threshold. the nmos acts as an ideal rectifier that conducts when the pmos is off. using a nmos switch instead of a diode allows for lower voltage drop across the switching d evice when it is on. the asynchronous switching combination between the pmos and the nmos allows the control loop to work in discontinuous mode for light load operations. in discontinuous mode, the mic 3 3163/4 works in pulse frequency modulation (pfm) to re gulate the output. as the output current increases, the off - time decreases, thus provides more energy to the output. this switching scheme improves the efficiency of mic 3 3163/4 during light load currents by only switching when it is needed. as the load cur rent increases, the mic 3 3163/4 goes into continuous conduction mode (ccm) and switches at a frequency centered at 4mhz. as shown in figure 3 , as the output c urrent increases, the switching frequency also increases until the mic 3 3163/4 goes from hll mode to p wm mode at approximately 120ma. the mic 3 3163/4 will switch at a relatively constant frequency around 4mhz o nce the output current is over 2 20ma. figure 3 . sw frequency vs. output current emission characteristic of MIC33163/4 the MIC33163/4 integrates switching components in a single package for reduce d emission s compared to standard buck regulator s with external mosfets and inductors. the radiated emi scans for the MIC33163/4 are shown in the functional c haracteristic . the limit on the graph is per en55022 class b standard. 1 10 100 1000 10000 1 10 100 1000 frequency (khz) output current (ma) switching frequency vs. output current v in = 3.6v v in = 5v 5 r .
micrel, inc. MIC33163/4 typical application circuit bill of materials item part number manufacturer description qty. c1 c1608x5r1a475k080ac tdk ( 7 ) 4.7f, 10v, x5r, size 0603 1 grm188r60j475ke19d murata ( 8 ) c2 c1608x5r1a105k tdk 1f, 10v, x5r, size 0603 1 c3 c1005c0g1h102j050ba tdk 1nf, 50v, 0402 1 c4 c1005c0g1h150j050ba tdk 15pf, 50v, 0402 1 grm1555c1h150jz01d murata c5 c1608x5r1a226m080ac tdk 22f,10v, x5r, size 0603 1 r1 crcw 0402301kfkea vishay ( 9 ) 301k, 1%, 1/16w, size 0402 1 r2 crcw 0402158k0fkea vishay 158k, 1%, 1/16w, size 0402 1 r3, r4 crcw 0402100kfkea vishay 100k, 1%, 1/16 w, size 0402 1 r5 crcw040249r9fked vishay 49.9?, 1%, 1/16w, size 0402 1 u1 mic3 3 1 63ygj micrel, inc. ( 10) 4mhz, 1 a, 100% duty cycle buck regulator with integrated inductor and hyperlight load 1 mic331 64ygj notes: 7. tdk: www.tdk.com . 8. murata: www.murata.com . 9. vishay: www.vishay.com . 10. micrel, inc.: www.micrel.com . may 22, 2014 16 revision 1.1
micrel, inc. MIC33163/4 pcb layout recommendations top bottom may 22, 2014 17 revision 1.1
micrel, inc. MIC33163/4 package information and recommended landing pattern ( 11) 20-p in 2.5mm 3mm qfn (gj) note: 11. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com . may 22, 2014 18 revision 1.1
micrel, inc. MIC33163/4 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 the accuracy or completeness of the information furnished in th is data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel rese rves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right . micrel products are not designed or authorized for use as components in life support appliances, devices or systems where mal function 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 reaso nably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk a nd purchaser agrees to fully indemnify micrel for any damages resul ting from such use or sale. ? 20 14 micrel, incorporated. may 22, 2014 19 revision 1.1

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