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mic33263/4 4mhz, 2a buck regulator with integrated inductor and hyperlight load ? general description the mic33263/4 is a highly - efficient synchronous buck regulator with an integrated inductor which provides the optimal trade - off between footprint and efficiency. the mic33263/4 operates at 4mhz switching frequency and provides up to 2a output current. in addition, the 100% duty cycle and hyperlight load ? (hll) mode - of - operation delivers very - high efficiency at light loads and ultra - fast transient response which mak es the mic33263/4 perfectly suited for any space - constrained 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 us e of small output capacitors . the mic33263/4 provide s small compact total solution size of 4. 6 mm 7mm with very few tiny external components . at higher loads, the mic33263/4 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, foldback current limit, power good (pg) indicator, and thermal shutdown. the mic33263/4 is available in a 20 - pin 2.5mm 3.0mm 1.9mm qfn package with an operating junction temperature range from ? 40 c to +85 c. datasheets and support documentation are available on micrel?s web site at : www.micrel.com . features ? in tegrated mosfets, inductor ? 100% duty cycle ? 4mhz pwm operation in continuous mode ? 2a output current ? low output voltage ripple ? 85% typical efficiency at 1ma and u p to 93% peak efficiency ? ultra - fast transient response ? advanced copper lead frame design provides superior thermal performance ? thermal - shutdo wn and current - limit protection ? low - radiated emission (emi) per en55022, class b ? adjustable output voltage 0.7v to 5v ? configurable soft - start with pre - bias start - up capability ? auto discharge of 180 (mic33264 only) ? low profile 2.5mm 3.0mm 1.9mm qfn packages ? 0.1a shutdown current ? 33a quiescent current applications ? 5v point - of - load (pol) ? low voltage distributed power systems ? space - constrained applications ? portable devices ? ssd storage systems ? dig ital 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 15, 2014 revision 1.1
micrel, inc. mic33263/4 ordering information part number output voltage auto discharge junction temperature range package ( 1 , 2 ) mic33263ygk adj no ? 40 c to +85c 20- pin 2.5mm 3mm qfn mic 33264ygk adj yes ? 40 c to +85c 20- pin 2.5mm 3mm qfn note: 1. qfn is a green, rohs - compliant package. mold compound is halogen free. 2. pb - free. lead finish is matte tin. pin configuration 2.5mm 3mm qfn ( gk ) (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 18 0 ohms (mic33164 only) . 10, 11, 12, 13 vout inductor output. 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 pi n 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 t o detect a power good condition . 18 fb feedback: connect a resistor divider from the output to ground 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 15, 2014 2 revision 1.1
micrel, inc. mic33263/4 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 se nsitive 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 +85 c thermal resistance 20- pin 2.5mm 3mm qfn ( ja ) ........................ 50 c/w electrical characteristics ( 6 ) t a = 25 c; v in = v en = 3.6v; c out = 22 f unless otherwise specified. bold values indicate ? 40c t j +85 c, unless otherwise specified. 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 85 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 0.682 0.7 0.717 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 1a, v in = 3.6v 0.3 % 20ma i load 1a, v in = 5.5v pwm switch on - resistance i sw = 100ma pmos 0.13 i sw = ? 100ma nmos switching frequency i out = 120ma 4 mhz soft - start (ss) time v out = 90%, c ss = 1nf 1000 s soft - start (ss) current v ss = 0v 2.2 a power good (pg) 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 15, 2014 3 revision 1.1
micrel, inc. mic33263/4 electrical characteristics ( 6 ) (continued) t a = 25 c; v in = v en = 3.6v; c out = 22 f unless otherwise specified. bold values indicate ? 40c t j +85 c, unless otherwise speci fied. 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 overtemperature shutdown 160 c overtemperature shutdown hysteresis 20 c sw pull - down resistance (mic33264 only) v en = 0v 180 ? may 15, 2014 4 revision 1.1
micrel, inc. mic33263/4 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 v out = 2.4v 0 5 10 15 20 25 30 35 40 45 2.5 3 3.5 4 4.5 5 5.5 iq (a) vin (v) quiscent current vs. input voltage v out = 2v no load 24 26 28 30 32 34 36 38 40 -40 -20 0 20 40 60 80 100 120 140 iq (a) temperature ( c) iq vs. temperature v in = 3.6v 1.999 2 2.001 2.002 2.003 2.004 2.005 2.006 2.5 3 3.5 4 4.5 5 5.5 output voltage (v) input voltage (v) line regulation (light loads) 150ma 50ma 1.998 2 2.002 2.004 2.006 2.008 2.01 2.012 2.014 2.016 2.018 2.5 3 3.5 4 4.5 5 5.5 output voltage (v) input voltage (v) line regulation (high loads) 500ma 300ma 2a 1.96 1.97 1.98 1.99 2 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 0 20 40 60 80 100 120 140 160 180 200 output voltage (v) output current (ma) output voltage vs. output current (dcm) v in = 3.6v may 15, 2014 5 revision 1.1
micrel, inc. mic33263/4 typical characteristics (continued) 1.94 1.95 1.96 1.97 1.98 1.99 2 2.01 2.02 2.03 2.04 2.05 2.06 200 400 600 800 1000 1200 1400 1600 1800 2000 output voltage (v) output current (ma) output voltage vs. output current (ccm) v in = 3.6v 1.9 1.92 1.94 1.96 1.98 2 2.02 2.04 2.06 2.08 2.1 -40 -20 0 20 40 60 80 100 120 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) vin (v) pg threshold vs. input voltage pg rising pg falling 2.4 2.42 2.44 2.46 2.48 2.5 2.52 2.54 2.56 -40 -20 0 20 40 60 80 100 120 uvlo threshold (v) temperature ( c) uvlo threshold vs. temperature v in = 3.6v uvlo on uvlo off 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 40 20 0 20 40 60 80 100 120 enable threshold (v) temperature ( c) enable threshold vs. temperature v in = 3.6v 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 1 10 100 1000 10000 1 10 100 1000 10000 sw frequency (khz) output current (ma) switching frequency vs. output current vin = 3.6v vin = 5v v out = 2v 0.68 0.685 0.69 0.695 0.7 0.705 0.71 0.715 0.72 -40 -20 0 20 40 60 80 100 120 feedback voltage (v) temperature( c) feedback voltage vs. temperature v in = 3.6v load = 50 ? shutdown current (a) temperature ( c) shutdown current vs. temperature v in = 3.6v may 15, 2014 6 revision 1.1
micrel, inc. mic33263/4 typical characteristics (continued) 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 20 40 60 80 100 120 maximum output current (ma) ambient temperature( c) maximum output current vs. temperature v in = 3.3v v in = 5v v out = 1.8v may 15, 2014 7 revision 1.1
micrel, inc. mic33263/4 functional characteristics may 15, 2014 8 revision 1.1
micrel, inc. mic33263/4 functional characteristics (continued) may 15, 2014 9 revision 1.1
micrel, inc. mic33263/4 functional characteristics (continued) may 15, 2014 10 revision 1.1
micrel, inc. mic33263/4 functional diagram figure 1 . simplified mic33263/4 functional block diagram ? may 15, 2014 11 revision 1.1
micrel, inc. mic33263/4 functional description pvin the input supply (pvin) provides power to the internal mosfets for the switch - mode regulator. the pvin 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 pvin and the power ground (pgnd) pin is required. refer to the pcb layout recommendations section for details. avin analog vin (avin) 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 av in. a 1f capacitor as close to avin as possible is recommended. refer to the pcb layout recommendation s 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 mic33264 switches an int ernal load of 180? on the regulators switch node to discharge the output. the mic33263/4 features external soft - start circuitry adjusted by the soft - start (ss) pin that 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 the vout pin. due to the high - speed switching on this pin, the switch node should be not be connecte d. 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 mic33263/4 is rated for an output current of up to 2a. a 22f capacitor is recommended for best performance. refer to the pcb layout recommendations 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 pow er ground (pgnd) loop. refer to the pcb layout recommendations section for details. pgnd the power ground 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 an alog 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 90% of its steady state voltage. a pull - up resistor of more than 5k ? should be connected from pg to vout. ss the soft - start (ss) pin is used to control the output voltage ramp - up time. setting css to 1nf sets the start - up time to the recommended minimum of approximately 575s. the start - up time can be d etermined by equation 1 : ss 3 ss c ) 10 ln( 10 250 t = fb this is the control input fo r programming the output 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 15, 2014 12 revision 1.1
micrel, inc. mic33263/4 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 15, 2014 13 revision 1.1
micrel, inc. mic33263/4 application information the mic33263/4 is a high - performance d c - to - dc step - down regulator offering a small solution size of 4.6mm 7mm. supporting an output current up to 2a inside a tiny 3mm 2.5mm qfn package, the mic33263/4 requires very few external components while meeting today?s miniature portable electronic device needs. using the hyperlight load (hll) switching scheme, the mic33263/4 is able to maintain high efficiency throughout the entire load range while providing ultra - fast load transient response. the following sections provide additional device application information. input capacitor a 2.2f ceramic capacitor or great er should be placed close to the pv in pin and pgnd pin for bypassing. a tdk c1608x5r0j475m, 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. y5 v temperature rating capacitors, aside from losing most of their capacitance over temperature, can also become resistive at high frequencies. this reduces their ability to filter out high - frequency noise. output capacitor the mic33263/4 is designed for use with a 22f or greater ceramic output capacitor. increasing the output capacitance will lower output ripple and improve load transient response but could also increase solution size or cost. a low equivalent series resistance (esr) ceramic output capacito r such as the tdk c1608x5r 1a 226m080ac , size 0603, 22 f 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 recommen ded due to their wide variation in capacitance over temperature and increased resistance at high frequencies. compensation the mic 33263/4 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 33263/4 enters 100% duty cycle when the input voltage gets close to the nominal output voltage, in this case the hi gh - 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 r dson and dcr of the inductor. this is extremely useful in battery - powered applications to accomplish longest operation time. efficiency considerations efficiency is 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 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 may 15, 2014 14 revision 1.1
micrel, inc. mic33263/4 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 mode (hll) mic 33263/4 uses a minimum on and off time proprietary control loop ( pcl) patented by micrel called hyperlight load (hll) . when the output voltage falls below the regulation threshold, the error comparator begins a switching cycle that turns the pmos on and keeps it o n 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 comparator turns the pmos off for a minimum - off - time until the output drops below the threshold. the nmos a cts 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 device when it is on. the asynchronous switching combination between the pmos and the nmos allows the co ntrol loop to work in discontinuous mode for light load operations. in discontinuous mode, the mic 33263/4 works in pulse frequency modulation (pfm) to regulate the output. as the output current increases, the off - time decreases, thus provides more energy t o the output. this switching scheme improves the efficiency of mic 33263/4 during light load currents by only switching when it is needed. as the load current increases, the mic 33263/4 goes into continuous conduction mode (ccm) and switches at a frequency c entered at 4mhz. as shown in figure 3 , as the output c urrent increases, the switching frequency also increases until the mic 33263/4 goes from hll mod e to p wm mode at approximately 120ma. the mic 33263/4 will switch at a relatively constant frequency around 4mhz once the output current is over 2 20ma. figure 3 . sw frequency vs. output emission characteristic of mic 33263/4 the mic 33263/4 integrates switching components in a single package, so the mic 33263/4 has reduced emission compared to standard buck regulator with external mosfets and inductors. the radiated emi scans for mic 33263/4 are shown in the functional characteristics . the limit on the graph is per en55022 class b standard. 1 10 100 1000 10000 1 10 100 1000 10000 sw frequency (khz) output current (ma) switching frequency vs. output current vin = 3.6v vin = 5v v out = 2v may 15, 2014 15 revision 1.1
micrel, inc. mic33263/4 typical application schematic 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 2 63y gk micrel, inc. ( 10) 4mhz, 2a buck regulator with integrated inductor and hyperlight load 1 mic332 64y gk notes: 7. tdk: www.tdk.com . 8. murata: www.murata.com . 9. vishay: www.vishay.com . 10. micrel, inc.: www.micrel.com . may 15, 2014 16 revision 1.1
micrel, inc. mic33263/4 pcb layout recommendations top layer bottom layer may 15, 2014 17 revision 1.1
micrel, inc. mic33263/4 package information and recommended landing pattern ( 11) 20- pin 2.5mm 3mm qfn ( gk ) note: 11. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com . may 15, 2014 18 revision 1.1
micrel, inc. mic33263/4 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 reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arisi ng 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 implie d 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 malfunction of a pr oduct 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 reasonably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life support applianc es, 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. ? 20 14 micrel, incorporated. may 15, 2014 19 revision 1.1

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