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mic5166 3a high-speed low v in ddr terminator ramp control is a trademark of micrel, inc 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 june 2012 m9999-060612-a general description the mic5166 is a 3a, high-speed, linear, low v in, double data rate (ddr), memory te rminator power supply. the part is small and requires small output capacitors making it a tiny overall solution. this allows it to be conveniently placed close to the ddr memo ry, minimizing circuit board layout inductance which may cause excessive voltage ripple at the ddr memory. the mic5166 contains a precision voltage divider network in order to take in the v ddq voltage as a reference voltage and conveniently output the terminator voltage (v tt ) at one half of the v ddq input voltage. the mic5166 is capable of sinking and sourcing up to 3a. it is stable with only two 10f ceramic output capacitors. the part is available in a small 3mm 3mm mlf ? thermally-enhanced package. the mic5166 has a high-side nmos output stage offering very-low output impedance, and very-high bandwidth. the nmos output stage offers a unique ability to respond very quickly to sudden load changes such as is required for ddr memory termination power supply applications. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? operating voltage range: ? v ddq supply: 0.9v to 3.6v ? bias supply: 2.5v to 5.5v ? high bandwidth ? very fast transient response ? stable with two 10f ceramic output capacitors ? two 10f output capacitors used in most applications ? high output voltage accuracy: ? 0.015% line regulation ? 1.5% load regulation ? logic level enable input ? power good (pg) ? thermally-enhanced 3mm 3mm mlf ? ? junction temperature range ?40c to +125c applications ? desktop computers ? notebook computers ? datacom systems ? servers ? video cards _________________________________________________________________________________________________________________________ typical application
micrel, inc. mic5166 june 2012 2 m9999-060612-a ordering information part number output voltage junction temperature range (1) package lead finish MIC5166YML ?vddq ?40 c to +125 c 10-pin 3mm 3mm mlf ? pb-free note: 1. mlf ? is a green rohs-compliant package. lead fini sh is nipdau. mold compound is halogen free.. pin configuration 10-pin 3mm 3mm mlf ? (ml) pin description pin number pin name description 1 vref reference voltage. this output provides an output of the internal reference voltage v ddq /2. the v ref output is used to provide the reference voltage fo r the memory chip. connect a 1.0f capacitor to ground at this pin. this pin can sink and source 10ma. 2 bias bias supply voltage. the bias supply is the po wer mosfet gate drive supply voltage and the supply bus for the ic. the bias voltage must be greater than (v tt + 2.2v). a 1.0f ceramic capacitor from the bias pin to pgnd must be placed next to the ic. 3 agnd analog ground. internal signal ground for all low-power circuits. 4 vddq input supply. vddq is connected to an inte rnal precision divider which provides the v ref . connect a 4.7f capacitor to ground at this pin. 5 pg power good. this is an open drain output that indica tes when the output voltage is within 10% of the reference voltage. the pg flag is asserted typically with 65s delay when the enable is set low or when the output goes outside 10% the window threshold. 6 sns feedback. input to the error amplifier. 7 en enable. logic level control of the output. log ic high enables the mic5166 and a logic low shuts down the mic5166. in the off state, supply current of the device is greatly reduced (typically 0.2a). the en pin should not be left open. 8 pgnd power ground. internal ground connection to the s ource of the internal, low-side drive, n-channel mosfet. 9 vtt power output. this is the connection to the sour ce of the internal high-side n-channel mosfet and drain of the low-side n-channel mosfet. this is a high-frequency, high-power connection, therefore two 10f output capacitors must be placed as close to the ic as possible. 10 vin high-side n-channel mosfet drain connection. the v in operating voltage range is from 0.9v to 3.6v. an input capacitor between the vin pin and t he pgnd is required as close to the chip as possible. ep epad exposed pad. must be connected to a gnd plane for best thermal performance.
micrel, inc. mic5166 june 2012 3 m9999-060612-a absolute maximum ratings (1) v bias .................................................................. ?0.3v to 6v v in ................................................................. ?0.3v to v bias v ddq ................................................................... ?0.3v to v in v tt ................................................................... ?0.3v to v in v en ................................................................. ?0.3v to v bias v pg ................................................................. ?0.3v to v bias pgnd to agnd ............................................. ?0.3v to 0.3v junction temper ature ................................................ 150c storage temperature rang e ....................?65c to +150c lead temperature (sol dering, 10s )............................ 260c continuous power dissipation (t a = 25c) (de-rated 16.4mw/ c above 25c) .....................1.64w continuous power dissipation (t a = 85c) .............656mw esd (2) ....??????????????..........2kv(hbm) operating ratings (3) supply voltage (v bias )...................................... 2.5v to 5.5v supply voltage (v in )......................................0.9v to 3.6v (4) supply voltage (v ddq ) .................................... 0.9v to v in (5) power good voltage (v pg ).................................. 0v to v bias enable input (v en ) ............................................... 0v to v bias junction temperature (t j ) ..................?40c t j +125c package thermal resistance 3mm x 3mm mlf ? -10 ( jc ).............................28. 7c/w 3mm x 3mm mlf ? -10 ( ja ).............................60.7c/w electrical characteristics (6) v in = 1.5v, v bias = 3.3v, v ddq = 1.5v, t a = 25c, unless noted. bold values indicate ?40c t j +125c. parameter condition min. typ. max. units power input supply input voltage range (v in ) 0.9 3.6 v undervoltage lockout trip level v in rising 0.625 0.8 0.9 v uvlo hysteresis 150 mv quiescent supply current (i in ) i out = 0a 0.1 10 a shutdown current (i in ) v en = 0v 0.1 5 a bias supply bias voltage range (v bias ) 2.5 5.5 v undervoltage lockout trip level v bias rising 1.9 2.23 2.33 v uvlo hysteresis 70 mv i out = 1ma 1.6 3 quiescent supply current (i bias ) i out = 1a 1.6 3 ma shutdown current (i bias ) v en = 0v 0.1 5 a v tt output v tt accuracy variation from v ref , i out = -3a to 3a ? 40 40 mv v sns =0.75v, i out = 10ma to +3a 1.5 2.1 load regulation v sns =0.75v, i out = -10ma to -3a ? 1.8 ? 1.4 % v in = 1.5v to 3.6v, v bias = 5.5v, i out = 100ma ? 0.05 0.005 0.05 line regulation v in = 1.5v, v bias = 2.5v to 5.5v, i out = 100ma ? 0.1 0.015 0.17 %/v
micrel, inc. mic5166 june 2012 4 m9999-060612-a electrical characteristics (6) (continued) v in = 1.5v, v bias = 3.3v, v ddq = 1.5v, t a = 25c, unless noted. bold values indicate ?40c t j +125c. parameter condition min. typ. max. units v ref output v ref voltage accuracy variation from (v ddq /2), i ref = -10ma to 10ma ? 1 1 % bias supply dropout voltage dropout voltage (v bias ? v tt ) i out = 100ma 1.15 v dropout voltage (v bias ? v tt ) i out = 500ma 1.25 v dropout voltage (v bias ? v tt ) i out = 3.0a 1.65 2.2 v enable control en logic high level logic high 1.2 v en logic low level logic low 0.2 v v en = 0.2v 1.0 en current v en = 1.2v 6.0 a start-up time from en pin going high to v tt 90% of v ref 55 s short-current protection sourcing current limit v in = 2.7v, v tt = 0v 3.1 4.9 7.8 a sinking current limit v in = 2.7v, v tt = v in ? 3.1 ? 4.9 ? 7.8 a internal fets top-mosfet r ds(on) source, i out = 3a (v tt to pgnd) 130 190 m ? bottom-mosfet r ds(on) sink, i out = -3a (v in to v tt ) 130 190 m ? power good (pg) pg window threshold % of v tt from v ref 90 110 % hysteresis 2 % pg output low voltage i pg = 4ma (sinking) 430 mv pg leakage current v pg = 5.5v, v sns = v ref 1.0 a thermal protection over-temperature shutdown t j rising 150 c over-temperature shutdown hysteresis 10 c notes: 1. exceeding the absolute maximum rating may damage the device. 2. devices are esd sensitive. handling pr ecautions recommended. human body model, 1.5k ? in series with 100pf. 3. the device is not guaranteed to function outside its operating rating. 4. if v bias 3.6v, then v in(max) = v bias . 5. if v bias 4v, then v ddq(max) = 2 (v bias ? 2.2v). if v bias > 4v, then v ddq(max) = 3.6v. 6. specification for packaged product only.
micrel, inc. mic5166 june 2012 5 m9999-060612-a typical characteristics v in operating supply current vs. input voltage 0.00 0.05 0.10 0.15 0.20 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 input voltage (v) supply current (a) v ddq = 1.2v v bias = 5v v tt = 0.6v i out = 0a v en = v bias v in shutdown current vs. input voltage 0.00 0.04 0.08 0.12 0.16 0.20 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 input voltage (v) shutdown current (a) v ddq = 1.2v v bias = 5v v en = 0v v ref /v ddq tracking ratio vs. vddq voltage 0.44 0.46 0.48 0.50 0.52 0.54 0.81.21.62.02.42.83.23.6 vddq voltage (v) v ref /v ddq v ddq = 1.2v v bias = 5v v tt = 0.6v i out = 0a v en = v bias v bias operating supply current vs. bias voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 2.5 3.0 3.5 4.0 4.5 5.0 bias voltage (v) supply current (ma) v in = 1.5v v ddq = 0.6v v tt = 0.3v i out = 0a v en = v bias v bias shutdown current vs. bias voltage 0.000 0.060 0.120 0.180 0.240 2.5 3.0 3.5 4.0 4.5 5.0 bias voltage (v) shutdown current (a) v in = 1.5v v ddq = 0.6v v en = 0v v ref /v ddq tracking ratio vs. bias voltage 0.44 0.46 0.48 0.50 0.52 0.54 2.5 3.0 3.5 4.0 4.5 5.0 bias voltage (v) v ref /v ddq v in = 1.5v v ddq = 0.6v i out = 0a v en = v bias enable threshold vs. input voltage 0.500 0.600 0.700 0.800 0.900 1.000 0.9 1.8 2.7 3.6 input voltage (v) enable threshold (v) rising falling v ddq = 1.2v v bias = 5v v tt = 0.6v i out = 0a enable pin current vs. input voltage 0.0 2.0 4.0 6.0 8.0 10.0 0.9 1.8 2.7 3.6 input voltage (v) enable pin current (a) v ddq = 1.2v v bias = 5.5v v tt = 0.6v v en = v in power good window/v tt ratio vs. input voltage 75% 80% 85% 90% 95% 100% 105% 110% 115% 0.91.82.73.6 input voltage (v) v pg window/v tt (%) v ddq = 1.2v v bias = 5v i out = 0a v en = v bias v tt falling vtt falling v tt rising vtt rising
micrel, inc. mic5166 june 2012 6 m9999-060612-a typical characteristics (continued) top mosfet on-resistance vs. input voltage 100 110 120 130 140 150 0.7 1.0 1.3 1.6 1.9 2.2 2.5 2.8 input voltage (v) on-resistance (m ? ) v in = 1.5v v ddq = 1.2v v bias = 5v v sns = open i sink = 3a v en = v bias bottom mosfet on-resistance vs. input voltage 100 110 120 130 140 150 0.7 1.0 1.3 1.6 1.9 2.2 2.5 2.8 input voltage (v) on-resistance (m ? ) v in = 1.5v v ddq = 1.2v v bias = 5v v tt = 0.6v i sink = -3a v en = v bias current limit vs. input voltage -5.0 -4.0 -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 4.0 5.0 1.2 1.6 2.0 2.4 2.8 3.2 3.6 input voltage (v) current limit (a) v ddq = 1.2v v bias = 5.0v v tt = 0.6v v en = v bias sinking sourcing load regulation vs. input voltage -2.0% -1.0% 0.0% 1.0% 2.0% 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6 input voltage (v) total regulation (%) v ddq = 1.2v v bias = 5.0v v tt = 0.6v i out = 0a to 3a v en = v bias sinking sourcing v ref -v tt vs. i_load -0.0150 -0.0100 -0.0050 0.0000 0.0050 0.0100 0.0150 -3.00 -2.00 -1.00 0.00 1.00 2.00 3.00 i_load (a) v ref -v tt (v) v bias = 5v v in = 1.5v v ddq =1.2v v tt = 0.6v v en = v bias v tt vs. i_load 0.5850 0.5900 0.5950 0.6000 0.6050 0.6100 -3.00 -2.00 -1.00 0.00 1.00 2.00 3.00 i_load (a) v tt (v) v bias = 5v v in = 1.5v v ddq =1.2v v tt = 0.6v v en = v bias v ref /v ddq vs. i_load 0.4900 0.4950 0.5000 0.5050 0.5100 -3.00 -2.00 -1.00 0.00 1.00 2.00 3.00 i_load (a) v ref /v ddq v bias = 5v v in = 1.5v v ddq =1.2v v tt = 0.6v v en = v bias v tt /v ddq vs. i_load 0.4900 0.4950 0.5000 0.5050 0.5100 -3.00 -2.00 -1.00 0.00 1.00 2.00 3.00 i_load (a) v tt /v ddq v bias = 5v v in = 1.5v v ddq =1.2v v in = 0.6v v en = v bias v in operating supply current vs. temperature 0.0 0.1 0.2 0.3 0.4 -50 -25 0 25 50 75 100 125 temperature (c) supply current (ua) v in = 1.5v v bias = 5v v ddq = 1.2v v tt = 0.6v i out = 0a v en = v bias
micrel, inc. mic5166 june 2012 7 m9999-060612-a typical characteristics (continued) v in shutdown current vs. temperature 0.0 0.1 0.2 0.3 0.4 0.5 -50 -25 0 25 50 75 100 125 temperature (c) shutdown current (ua) v in = 1.5v v bias =5v v ddq = 1.2v v en = 0v v in uvlo threshold vs. temperature 0.6 0.7 0.8 0.9 1.0 -50-25 0 255075100125 temperature (c) uvlo threshold (v) rising falling v bias = 5.0v vddq = 1.2v vtt = 0.6v i out = 0a v bias = 5.0v v ddq = 1.2v v tt = 0.6v i out = 0a v en = v bias enable threshold vs. temperature 0.5000 0.6000 0.7000 0.8000 0.9000 1.0000 -50 -25 0 25 50 75 100 125 temperature (c) enable threshold (v) falling rising v in = 1.5v v bias = 5v v ddq = 1.2v v tt = 0.6v sourcing load regulation vs. temperature -2.0% -1.5% -1.0% -0.5% 0.0% 0.5% 1.0% -50 -25 0 25 50 75 100 125 temperature (c) load regulation (%) v in = 1.5v v bias = 5v v ddq = 1.2v v tt = 0.6v i out = 0a to 3a v en = v bias sinking load regulation vs. temperature -2.0% -1.5% -1.0% -0.5% 0.0% 0.5% 1.0% -50 -25 0 25 50 75 100 125 temperature (c) load regulation (%) v in = 1.5v v bias = 5.5v v ddq = 1.2v v tt = 0.6v i out = 0a to -3a v en = v bias v ref /v ddq tracking ratio vs. temperature 0.597 0.598 0.599 0.600 0.601 -50 -25 0 25 50 75 100 125 temperature (c) v ref /v ddq v in = 1.5v v bias = 5v v ddq = 1.2v v tt = 0.6v i out = 0a v en = v bias output voltage vs. temperature 0.5970 0.5980 0.5990 0.6000 0.6010 -50 -25 0 25 50 75 100 125 temperature (c) output voltage (v) v in = 1.5v v bias = 5v v ddq = 1.2v v tt = 0.6v i out = 0a v en = v bias current limit vs. temperature 4.5 4.8 5.0 5.3 5.5 -50 -25 0 25 50 75 100 125 temperature (c) current limit (a) v in = 1.5v v bias = 5v v ddq = 1.2v v tt = 0.6v v en = v bias sourcing sinking enable pin current vs. temperature 0 1 2 -50 -25 0 25 50 75 100 125 temperature (c) enable pin current (a) v in = 1.5v v bias = 5v v ddq = 1.2v v en = v in
micrel, inc. mic5166 june 2012 8 m9999-060612-a typical characteristics (continued) top mosfet on-resistance vs. temperature 100 115 130 145 160 175 -50 -25 0 25 50 75 100 125 temperature (c) on-resistance (m ? ) v in = 1.5v v bias = 5v v ddq = 1.2v v tt = 0.6v i source = +3a v en = v bias bottom mosfet on-resistance vs. temperature 110 120 130 140 150 160 -50 -25 0 25 50 75 100 125 temperature (c) on-resistance (m ? ) v in = 1.5v v bias = 5v v ddq = 1.2v v tt = 0.6v i sink = -3a v en = v bias
micrel, inc. mic5166 june 2012 9 m9999-060612-a functional characteristics
micrel, inc. mic5166 june 2012 10 m9999-060612-a functional characteristics (continued)
micrel, inc. mic5166 june 2012 11 m9999-060612-a functional diagram figure 1. mic5166 block diagram
micrel, inc. mic5166 june 2012 12 m9999-060612-a application information ddr memory requires two power supplies, one for the memory chip, referred to as v ddq and the other for a termination supply v tt , which is one-half v ddq . with memory speeds in excess of 300mhz, the memory system bus must be treated as a transmission line. to maintain good signal integrity the memory bus must be terminated to minimize signal reflections. figure 2 shows the simplified termination circuit. each control, address and data lines have these term ination resistors rs and rt connected to them. figure 2. ddr memory termination circuit bus termination provides a means to increase signaling speed while maintaining good signal integrity. the termination network consists of a series resistor (r s ) and a terminating resistor (r t ). values of r s range between 10 ? to 30 ? with a typical of 22 ? , while r t ranges from 22 ? to 28 ? with a typical value of 25 ? . v ref must maintain half v ddq with a 1% tolerance, while v tt will dynamically sink and source current to maintain a termination voltage of 40mv from the v ref line under all conditions. this method of bus termination reduces common-mode noise, settling time, voltage swings, emi/rfi and improves slew rates. v ddq powers all the memory ics, memory drivers and receivers for all the memory bits in the ddr memory system. the mic5166 regulates v tt to v ddq/2 during sourcing or sinking current. the memory bits are not usually all at a logic high or logic low at the same time so the v tt supply is usually not sinking or sourcing ? 3a or +3a current continuously. v tt v tt is regulated to v ref . due to high-speed signaling, the load current seen by v tt is constantly changing. to maintain adequate transient response, two 10f ceramic capacitors are required. the proper placement of ceramic capacitors is important to reduce both esr and esl such that high-current and high-speed transients do not exceed the dynamic voltage tolerance requirement of v tt . the ceramic capacitors provide current during the fast edges of the bus transition. using several smaller ceramic capacitors distributed near the termination resistors is important to redu ce the effects of pcb trace inductance. v ddq the v ddq input on the mic5166 is used to create the internal reference voltage for v tt . the reference voltage is generated from an internal resistor divider network of two 500k ? resistors, generating a reference voltage v ref that is v ddq/2 . the v ddq input should be kelvin connected as close as possible to the memory supply voltage. since the reference is simply v ddq/2 , any perturbations on v ddq will also appear at half the amplitude on the reference. for this reason a 4.7f ceramic capacitor is required on the v ddq supply. this will aid performance by improving the source impedance over a wide frequency range. sense the sense (sns) pin provides the path for the error amplifier to regulate v tt . the sns input must also be kelvin connected to the v tt bypass capacitors. if the sns input is connected to close to the mic5166, the ir drop of the pcb trace can cause the v tt voltage at the memory chip to be too low. placing the mic5166 as close as possible to the ddr memory will improve the load regulation performance. enable the mic5166 features an active-high enable input (en) that allows on-off control of the regulator. the current through the device reduces to near ?zero? when the device is shutdown, with only <0.2a of leakage current. the en input may be directly tied to v bias . the active high enable pin uses cmos technology and the enable pin cannot be left floating; a floating enable pin may cause an indeterminate state on the output.
micrel, inc. mic5166 june 2012 13 m9999-060612-a power good (pg) the power-good (pg) output pr ovides an under and over voltage fault flag for the v tt output. the pg output remains high as long as v tt is within 10% range of v ref and goes low if the output moves beyond this range. figure 3. power good threshold the pg has an open-drain output. a pull-up resistor must be connected to v ibias , v in or an external source. the external source voltage must not exceed the maximum rating of the pin. the pg pin can be connected to another regulator?s enable pin for sequencing of the outputs. v bias requirement a 1f ceramic input capacitor is required on v bias pin. to achieve the ultra-fast transient response, the mic5166 uses an all n-channel power output stage as shown in the functional diagram. the high-side n- channel mosfet requires the v bias voltage to be 2.2v higher than the v tt to be able to fully enhance the high- side mosfet. v in requirement v in is used to supply the rail voltage for the high-side n- channel power output stage. it is normally connected to v ddq , but it can be connected to a lower voltage to reduce power dissipation. in this case, the input voltage must be higher than the v tt voltage to ensure that the output stage is not operating in dropout. component selection input capacitor a 10f ceramic input capacitor is all that is required for most applications if it is close to a bulk capacitance. the input capacitor must be placed on the same side of the board and next to the mic5166 to minimize the dropout voltage and voltage ringing during transient and short circuit conditions. it is also recommended that each capacitor to be connected to the pgnd directly, not through vias. 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. output capacitor as part of the frequency compensation, the mic5166 requires two 10f ceramic output capacitors for best transient performance. to improve transient response, any other type of capacitor can be placed in parallel as long as the two 10f ceramic output capacitors are placed next to the mic5166. the output capacitor type and placement criteria are the same as the input capacitor. see the input capacitor section for a detailed description. thermal considerations the mic5166 is packaged in the 3mm x 3mm mlf ? , a package that has excellent t hermal performance. this maximizes heat transfer from the junction to the exposed pad (epad) which connects to the ground plane. the size of the ground plane attached to the exposed pad determines the overall thermal resistance from the junction to the ambient air surrounding the printed circuit board. thermal design the most complicated design parameters to consider are thermal characteristics. thermal design requires the following application-speci c parameters: ? maximum ambient temperature (t a ) ? output current (i out ) ? output voltage (v out ) ? input voltage (v in ) ? ground current (i gnd )
micrel, inc. mic5166 june 2012 14 m9999-060612-a first, calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet. p d = (v in ? v tt ) i out + (v bias i gnd ) eq. 1 where the ground current is approximated by using numbers from the ?electrical characteristics? or ?typical characteristics.? for example, given an expected maximum ambient temperature (t a ) of 70 c with v in = 1.2v, v bias = 3.3v, v tt = 0.9v, and i out = 3a, first calculate the expected p d using equation 1: p d = (1.2v ? 0.9v) 3a + 3.3v 0.0016a = 0.90528w eq. 2 next, determine the junction temperature for the expected power dissipation above using the thermal resistance ( ja ) of the 10-pin 3mm 3mm mlf ? (yml) adhering to the following criteria for the pcb design (1oz. copper and 100mm 2 copper area for the mic5166): t j = ( ja p d ) + t a = (60.7 c/w 0.90528w) + 70 c = 124.95 c eq. 3 to determine the maximum power dissipation allowed that would not exceed the ic?s maximum junction temperature (125 c) when operating at a maximum ambient temperature of 70 c: p d(max) = (t j(max) ? t a )/ ja = (125 c ? 70 c)/(60.7 c/w) = 0.9061w eq. 4 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 thermocouple that comes with the thermal voltage meter. this thermocouple 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 thermocouple or an infrared thermometer. if a thermocouple is used, it must be constructed of 36 gauge wire or higher to minimize the wire heatsinking effect. in addition, the thermocouple tip must be covered in either thermal grease or thermal glue to make sure that the thermocouple junction is making good contact to the case of the ic. this thermocouple from omega (5sc-tt-k-36-36) is adequate for most applications. to avoid this messy thermocouple 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 x 3mm mlf ? package.
micrel, inc. mic5166 june 2012 15 m9999-060612-a sequencing the following diagr ams illustrate meth ods for connecting mic5166?s to achieve sequencing requirements: figure 6. turn-on sequence with soft-start (rc = 3.3nf) figure 7. turn-on sequence with no soft-start (rc = open)
micrel, inc. mic5166 june 2012 16 m9999-060612-a pcb layout guidelines warning!!! to minimize emi and output noise, follow these layout recommendations pcb layout is critical to achieve reliable, stable and efficient performance. a ground plane is required to control emi and minimize the inductance in power, signal and return paths. the following guidelines should be followed to insure proper operation of the mic5166 converter. ic ? the 10f ceramic capacitor, which is connected to the vin pin, must be located right at the ic. the vddq pin is very noise sensitive and placement of the capacitor is very critical. use wide traces to connect to the vddq and agnd pins. ? the signal ground pin (agnd) must be connected directly to the ground planes. do not route the agnd pin to the pgnd pad on the top layer. ? place the ic close to the point-of-load (pol). ? use wide traces to route the input and output power lines. ? signal and power grounds should be kept separate and connected at only one location. input capacitor ? a 10f x5r or x7r dielectric ceramic capacitor is recommended on each of the vin pins for bypassing. ? place the input capacitors on the same side of the board and as close to the ic as possible. ? keep both the vin pin and pgnd connections short. ? place several vias to the ground plane close to the input capacitor ground terminal. ? use either x7r or x5r dielectric input capacitors. do not use y5v or z5u type capacitors. ? do not replace the ceramic input capacitor with any other type of capacitor. any type of capacitor can be placed in parallel with the input capacitor. ? if a tantalum input capacitor is placed in parallel with the input capacitor, it must be recommended for switching regulator applications and the operating voltage must be derated by 50%. ? in ?hot-plug? applications, a tantalum or electrolytic bypass capacitor must be used to limit the over- voltage spike seen on the input supply with power is suddenly applied. output capacitor ? use a wide trace to connect the output capacitor ground terminal to the input capacitor ground terminal. ? phase margin will change as the output capacitor value and esr changes. contact the factory if the output capacitor is different from what is shown in the bom. ? the feedback divider network must be place close to the ic with the bottom of r2 connected to agnd. ? the feedback trace should be separate from the power trace and connected as close as possible to the output capacitor. sensing a long high current load trace can degrade the dc load regulation.
micrel, inc. mic5166 june 2012 17 m9999-060612-a evaluation board schematics
micrel, inc. mic5166 june 2012 18 m9999-060612-a evaluation board sche matics (continued)
micrel, inc. mic5166 june 2012 19 m9999-060612-a bill of materials item part number manufacturer description qty. 08056d226mat avx (3) c2012x5r0j226k tdk (2) c1, c2, c19 grm21br60j226me39l murata (1) 22f, 6.3v, ceramic capacitor, x5r, 0805 3 08056d225kat2a avx (3) c2012x5r0j225k tdk (2) c3 grm21br60j225ka01l murata (1) 2.2f, 6.3v, ceramic capacitor, x5r, 0805 1 06035c102kat avx (3) c1608x7r1h102k tdk (2) c4, c6, c12 grm188r71h102ka01d murata (1) 1nf, 50v, ceramic capacitor, x7r, 0603 3 06035a390jat2a avx (3) c1608c0g1h390j tdk (2) c7 grm1885c1h390ja01d murata (1) 39pf, 50v, ceramic capacitor, npo, 0603 1 06035a391jat2a avx (3) c1608c0g1h391j tdk (2) c8 grm188r71h391ka01d murata (1) 390pf, 50v, ceramic capacitor, npo, 0603 1 06035a101jat2a avx (3) c1608c0g1h101j tdk (2) c9 grm1885c1h101ja01d murata (1) 100pf, 50v, ceramic capacitor, npo, 0603 1 12066d476mat2a avx (3) c3216x5r0j476m tdk (2) c10, c11 grm31cr60j476me19l murata (1) 47 f, 6.3v, ceramic capacitor, x5r,1206 2 12106d107mat2a avx (3) c3225x5r0j107m tdk (2) c14 grm32er60j107me20l murata (1) 100f, 6.3v, ceramic capacitor, x5r, 1210 1 06036d106mat avx (3) fp3-1r0-r tdk (2) c15, c20, c24 grm188r60j106me47d murata (1) 10f, 6.3v, ceramic capacitor, x5r, 0603 3 06036d105kat2a avx (3) c1608x5r0j105k tdk (2) c16, c18, c21, c23 grm188r60j105ka01d murata (1) 1f, 6.3v, ceramic capacitor, x5r, 0603 4 06036d475kat2a avx (3) c1608x5r0j475m tdk (2) c17 c1608x5r0j475m murata (1) 4.7f, 6.3v, ceramic capacitor, x5r, 0603 1
micrel, inc. mic5166 june 2012 20 m9999-060612-a bill of materials (continued) item part number manufacturer description qty. c5 n.u. 0603 ceramic capacitor 1 06035c104kat2a avx (3) c1608x7r1h104k tdk (2) c22 grm188r71h104ka93d murata (1) 0.1f, 50v, ceramic capacitor, x7r, 0603 1 c13 eeu-fc1a471 panasonic (4) 470f/10v, elect., 20%, 8x11.5, radial 1 l1 fp3-1r0-r cooper (5) 1h,6.26a inductor 1 q3, q4 nds8425 fairchild (7) mosfet, n-ch 20v 7.4a 8-soic 2 r1a crcw0603300rfkea vishay dale (6) 300 ? , resistor, 1%, 0603 r1b crcw06031101fkea vishay dale (6) 510 ? , resistor, 1%, 0603 r1c crcw0603806rfkea vishay dale (6) 806 ? , resistor, 1%, 0603 r1d crcw06031k10fkea vishay dale (6) 1.1k, resistor, 1%, 0603 1 r2 crcw0603698rfkea vishay dale (6) 698 ? , resistor, 1%, 0603 1 r3 crcw06032002fkea vishay dale (6) 20k, resistor, 1%, 0603 1 r4 crcw06034752fkea vishay dale (6) 47.5k, resistor, 1%, 0603 1 r6, r8, r11, r17, r21 crcw06032r20rfkea vishay dale (6) 2.2 ? , resistor, 1%, 0603 5 r7 crcw060349r9rfkea vishay dale (6) 49.9 ? , resistor, 1%, 0603 1 r9 crcw06031002fkea vishay dale (6) 10k, resistor, 1%, 0603 1 r10, r19 crcw06031k00fkea vishay dale (6) 1k, resistor, 1%, 0603 2 r12 crcw0603000rfkea vishay dale (6) 0 ? , resistor, 1%, 0603 1 r13, r14, r24 crcw25121r00fkeghp vishay dale (6) 1 ? , resistor, 1.5w, 1%, 2512 3 r15 crcw25122r00jneg vishay dale (6) 2 ? , resistor, 1.5w, 1%, 2512 1 r16, r18, r20 crcw06031003fkea vishay dale (6) 100k, resistor, 1%, 0603 3 r22, r23 lr2512-r50fw vishay dale (6) 0.5 ? , resistor, 1.5w, 1%, 2512 2 rv1 pv36w103c01b00 murata (1) pot, 10k ? , 0.5w, 9.6x5xx10 1 u1 mic22405yml micrel (9) 4a, synchronous buck regulator 1 u2 mic5166ymm micrel (9) 3a high-speed low v in ddr terminator 1 u3 sn74ahct00rgyr ti (8) quad, 2in pos-nand gate, 14-pin, qfn 1 u4 mic1557ym5 micrel (9) 5mhz rc timer oscillator 1 u5 mic4425 micrel (9) 3a dual inverting and non-inverting mosfet driver 1 notes: 1. murata tel: www.murata.com . 2. tdk: www.tdk.com . 3. avx: www.avx.com . 4. panasonic: www.panasonic.com . 5. cooper: www.cooper.com 6. vishay dale: www.vishay.com . 7. fairchild: www.fairchildsemi.com . 8. ti : www.ti.com 9. micrel, inc.: www.micrel.com .
micrel, inc. mic5166 june 2012 21 m9999-060612-a pcb layout recommendations top silk copper layer 1
micrel, inc. mic5166 june 2012 22 m9999-060612-a pcb layout recommendations (continued) copper layer 2 copper layer 3
micrel, inc. mic5166 june 2012 23 m9999-060612-a pcb layout recommendations (continued) copper layer 4 bottom silk
micrel, inc. mic5166 june 2012 24 m9999-060612-a package information 10-pin 3mm 3mm mlf ? (ml)
micrel, inc. mic5166 june 2012 25 m9999-060612-a recommended landing pattern 10-pin 3mm 3mm mlf ? land pattern 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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