View MC33466-D_2952214.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

? semiconductor components industries, llc, 2001 november, 2001 rev. 5 1 publication order number: mc33466/d mc33466 fixed frequency pwm micropower dc-to-dc converter the mc33466 series are micropower switching voltage regulators, specifically designed for handheld and laptop applications, to provide regulated output voltages using a minimum of external parts. a wide choice of output voltages are available. these devices feature a very low quiescent bias current of 15 m a typical. the mc33466hxxjt1 series features a highly accurate voltage reference, an oscillator, a pulse width modulation (pwm) controller, a driver transistor (lx), an error amplifier and feedback resistive divider. the mc33466hxxlt1 is identical to the mc33466hxxjt1, except that a drive pin (ext) for an external transistor is provided. due to the low bias current specifications, these devices are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable. mc33466 series features: ? low quiescent bias current of 15 m a ? high output voltage accuracy of 2.5% ? low startup voltage of 0.9 v at 1.0 ma ? softstart = 500 m s ? surface mount package sot89 h suffix case 1213 http://onsemi.com marking diagram 1 tab pin connections (tab is connected to pin 2) 1 2 3 (top view) ground output lx tab mc33466hxxjt1 (tab is connected to pin 2) 1 2 3 (top view) ground output ext tab mc33466hxxlt1 see detailed ordering and shipping information in the package dimensions section on page 13 of this data sheet. ordering information xx = voltage option (30, 33, 50) yy = 1a = jt1, 2b= lt1 zz = lot code xxy yzz
mc33466 http://onsemi.com 2 figure 1. representative block diagrams this device contains 100 active transistors. gnd drive pwm controller 100 khz oscillator v ref 1 2 v o mc33466hxxjt1 mc33466hxxlt1 phase comp soft-start output (voltage feedback) 3 ext gnd drive pwm controller 50 khz oscillator v ref 1 2 v o phase comp soft-start output (voltage feedback) 3 v lx limiter lx v in v in xx denotes output voltage c o c o d d l l rb cb q c in c in maximum ratings (t c = 25 c, unless otherwise noted.) rating symbol value unit power supply voltage (transient) v o 12 v power supply voltage (operating) v o 8.0 v external pin voltage v ext 0.3 to v o v lx pin voltage v lx 12 v ext pin source/sink current i ext 50 ma lx pin sink current i lx 250 ma power dissipation and thermal characteristics h suffix, plastic package case 1213 (sot89) maximum power dissipation @ t a = 25 c p d 500 mw thermal resistance, junctiontoair r q ja 200 c/w operating junction temperature t j 125 c operating ambient temperature t a 30 to +80 c storage temperature range t stg 40 to +125 c note: esd data available upon request.
mc33466 http://onsemi.com 3 electrical characteristics (v cc = 2.0 v, i o = 10 ma and t a = 25 c, unless otherwise noted.) characteristic symbol min typ max unit oscillator frequency f osc khz jt1 suffix 40 50 60 lt1 suffix 80 100 120 oscillator minimum startup voltage (i o = 1.0 ma) v start v jt1 suffix 0.8 0.9 oscillator minimum supply voltage (i o = 1.0 ma) v cc v jt1 suffix 0.7 oscillator startup voltage (i o = 0 ma) v start v lt1 suffix 0.7 0.8 lx output (jt1 suffix) on state sink current (v lx = 0.4 v) i lx ma 30jt1 suffix 60 33jt1 suffix 63 50jt1 suffix 80 v lx voltage limit (note 1) v lxlim 0.65 0.8 1.0 v off state leakage current (v lx = 6.0 v) i lkg 0.5 m a ext output (lt1 suffix) on state source current (v ext = v o 0.4 v) i source ma 30lt1 suffix 1.5 33lt1 suffix 1.575 50lt1 suffix 2.0 off state sink current (v ext = 0.4 v) i sink ma 30lt1 suffix 1.5 33lt1 suffix 1.575 50lt1 suffix 2.0 total device maximum duty ratio each cycle d 70 80 90 % output voltage v o v 30jt1 or 30lt1 suffix 2.925 3.0 3.075 33jt1 or 33lt1 suffix 3.218 3.3 3.383 50jt1 or 50lt1 suffix 4.875 5.0 5.125 softstart time (note 2) t ss 0.5 2.0 ms quiescent bias current (i o = 0 ma) i q m a 30jt1 suffix (v in = 1.8 v) 15 25 33jt1 suffix 17 27 50jt1 suffix (v in = 3.0 v) 30 45 quiescent bias current (v in = v o + 0.5 v, i o = 0 ma) 30jt1 suffix 2.0 5.0 33jt1 suffix 2.0 5.0 50jt1 suffix 2.0 5.0 quiescent bias current (i o = 0 ma) i q m a 30lt1 suffix (v in = 1.8 v) 30 50 33lt1 suffix 34.5 56 50lt1 suffix (v in = 3.0 v) 60 90 quiescent bias current (v in = v o + 0.5 v, i o = 0 ma) 30lt1 suffix 2.0 5.0 33lt1 suffix 2.0 5.0 50lt1 suffix 2.0 5.0 1. when the lx switch is turned on, i lx current carried through the r ds(on) of the lx switch results in v lx . when v lx reaches v lxlim , the lx switch is turned off by the lx switch protection circuit. 2. the softstart circuit turnon sequence is as follows: a) v in is applied. b) the internal ic v ref is held at zero for 200 m s. during this time, the error amplifier output voltage ramps up to the positive voltage rail. c) the internal reference steps up to 0.7 v after 200 m s delay has timed out. d) the error amplifier output voltage integrates down to its steady state value. as the error amplifier output integrates down, the output lx pin of ext pin pulse width gradually widens to its steady operating value.
mc33466 http://onsemi.com 4 typical applications 0.5 0 200 80 t a , ambient temperature ( c) i q , quiescent bias current ( m a) i q , quiescent bias current ( m a) 80 60 40 20 0 20 40 0 100 figure 2. quiescent current versus temperature t a , ambient temperature ( c) figure 3. quiescent current versus temperature mc33466h50jt1 i o = 0 ma v in = 3.0 v figure 4. oscillator frequency versus temperature figure 5. maximum duty ratio versus temperature figure 6. lx switching current versus temperature figure 7. v lx voltage limit versus temperature mc33466h50jt1 i o = 10 ma v in = 3.0 v 80 60 40 mc33466h50jt1 i o = 0 ma v in = 5.5 v 80 60 40 20 0 20 40 0 5 3 2 1 i lx , lx switching current (ma) 80 60 40 20 0 20 40 t a , ambient temperature ( c) 160 120 1.0 mc33466h50jt1 i o = 10 ma v in = 3.0 v v lxlim , v lx voltage limit (v) 80 60 40 20 0 20 40 t a , ambient temperature ( c) 0.9 0.8 40 0.7 0.6 20 4 f osc , oscillator frequency (khz) 80 60 40 20 0 20 40 t a , ambient temperature ( c) mc33466h50jt1 l = 120 m h i o = 10 ma v in = 3.0 v d max , maximum duty ratio (%) 80 60 40 20 0 20 40 60 100 t a , ambient temperature ( c) 90 80 70 mc33466h50jt1 l = 120 m h i o = 10 ma v in = 3.0 v 20 100 80 60 40
mc33466 http://onsemi.com 5 typical applications 100 efficiency (%) 40 100 150 50 0 90 i o , output current (ma) 80 70 i o , output current (ma) 1.0 6.0 3.0 5.0 4.0 2.0 1.0 6.0 80 100 120 v o , output voltage (v) figure 8. output voltage versus output current figure 9. output voltage versus output current figure 10. output voltage versus output current figure 11. output voltage versus output current figure 12. efficiency versus output current figure 13. effciency versus output current mc33466h50jt1 l = 120 m h t a = 25 c mc33466h50jt1 l = 120 m h t a = 25 c v in = 4.0 v v in = 3.0 v v in = 1.0 v v in = 2.0 v 3.0 60 40 20 0 i o , output current (ma) 5.0 4.0 mc33466h50lt1 l = 28 m h t a = 25 c v in = 3.0 v v in = 2.0 v v in = 1.5 v v in = 4.0 v 400 500 600 300 200 100 0 i o , output current (ma) 2.0 v o , output voltage (v) i o , output current (ma) 100 0 1000 500 0 80 i o , output current (ma) 60 40 20 mc33466h50lt1 l = 28 m h t a = 25 c 2.6 3.1 40 60 v o , output voltage (v) v in = 2.0 v v in = 1.0 v v in = 1.5 v 2.8 20 0 3.0 2.9 2.7 2.5 mc33466h30jt1 l = 120 m h t a = 25 c 3.1 400 600 v o , output voltage (v) v in = 2.0 v v in = 0.9 v v in = 1.5 v 2.8 200 0 3.0 2.9 v in = 2.5 v mc33466h30lt1 l = 28 m h t a = 25 c efficiency (%) 60 50 v in = 2.0 v v in = 1.0 v v in = 3.0 v v in = 3.0 v v in = 4.0 v v in = 2.0 v v in = 1.5 v v in = 3.0 v v in = 3.0 v v in = 4.0 v
mc33466 http://onsemi.com 6 typical applications 1.6 v start /v hold , voltage limit (v) 0 20 30 10 0 1.2 i o , output current (ma) 0.8 0.4 100 0 400 500 600 300 200 100 0 80 i o , output current (ma) 60 40 20 100 figure 14. efficiency versus output current figure 15. efficiency versus output current figure 16. startup/hold voltage versus output current figure 17. startup/hold voltage versus output current mc33466h30jt1 l = 120 m h t a = 25 c figure 22 mc33466h50jt1 l = 120 m h t a = 25 c figure 22 v in = 2.0 v v in = 1.5 v v in = 1.0 v v start v hold 0 20 25 30 15 10 5.0 0 80 i o , output current (ma) 60 40 20 mc33466h30lt1 l = 28 m h t a = 25 c figure 23 v in = 2.0 v v in = 1.5 v v in = 0.9 v 1.6 v start /v hold , voltage limit (v) 0.6 80 100 120 60 40 20 0 1.4 i o , output current (ma) 1.2 1.0 0.8 mc33466h50lt1 l = 28 m h t a = 25 c figure 23 v start v hold v start /v hold , startup/hold voltage (v) 0.2 40 60 80 0.6 0 20 40 t a , ambient temperature ( c) 1.0 0.8 0.4 20 v o , output voltage (v) figure 18. output voltage versus temperature figure 19. startup/hold voltage versus temperature mc33466h50jt1 l = 120 m h i o = 10 ma v in = 3.0 v figure 22 4.8 40 60 80 5.0 0 20 40 t a , ambient temperature ( c) 5.2 5.1 4.9 20 mc33466h50jt1 l = 120 m h i o = 3.0 ma figure 22 v start v hold efficiency (%) efficiency (%) v in = 2.5 v
mc33466 http://onsemi.com 7 typical applications v o , output voltage (v) 5.0 5.4 5.2 40 50 60 20 10 0 t, time (ms) 30 4.8 4.6 i cc , supply current ( m a) figure 20. supply current versus input voltage figure 21. load transient response mc33466h50jt1 l = 120 m h i o = 0 ma figure 22 0 150 250 200 4.0 5.0 6.0 2.0 1.0 0 v in , input voltage (v) 3.0 100 50 mc33466h50jt1 l = 120 m h i o = 1.0 to 30 ma v in = 3.0 v figure 22 i o , output current (ma) 0 150 250 200 100 50
mc33466 http://onsemi.com 8 definitions quiescent bias current current which is used to operate the switching regulator chip and is not delivered to the load. leakage current current drawn through a transistor junction, under a specified collector voltage, when the transistor is off. functional description introduction the mc33466 series are monolithic power switching regulators optimized for dctodc converter applications where power drain must be minimized. the combination of features in this series allows the system designer to directly implement stepup, stepdown or flyback converters with a small number of external components. potential applications include low power consumer products and battery powered portable products. typical application circuits are shown in figures 22 through 26. operating description the mc33466 series converters operate as a fixed frequency voltage mode regulator. operation is intended to be in the discontinuous mode, where the inductor current ramps up to a peak value which is greater than or equal to twice the value of the dc input current during the ontime of the transistor switch. during the offtime of the transistor switch, the inductor current ramps down to zero and remains at zero until another switching cycle begins. because the output voltage pin is also used as the supply voltage for powering internal circuitry, an external startup circuit is needed in stepdown converter and flyback designs to provide initial power to the integrated circuit to begin switching. the startup circuit needed can be three discrete components, as shown in figure 24, or a micropower undervoltage sensor, as shown in figure 25. oscillator the oscillator frequency, is internally programmed to 50 khz for the jt1 suffix and 100 khz for the lt1 suffix. the timing capacitor (c t ) discharge to charge ratio of the oscillator is designed for a maximum duty cycle of 80% at the lx or ext output. during the charge of c t , the oscillator generates an internal blanking pulse that holds the pwm control off, disabling the output transistor drive. the oscillator peak and valley thresholds are 0.5 v and ground, respectively. pulse width modulator the pulse width modulator consists of a comparator with the oscillator ramp voltage applied to the inverting input, while the error amplifier output is applied to the noninverting input. output switch conduction is initiated when the timing capacitor is charged to its peak voltage value. when the timing capacitor ramp discharges to a voltage below the error amplifier output, the comparator resets a latch terminating output transistor drive for the duration of the oscillator ramp period. error amplifier and reference an error amplifier is provided which has a nominal 80 db of voltage gain at dc. internal compensation components provide poles at 0.25 hz, 30 khz and 33 khz. two zeros are provided at 1.0 khz and at 2.5 khz. the output voltage value is set by the internal voltage divider and a 0.7 v reference which is trimmed to an accuracy of 2.5%. because the loop compensation components are located within the ic, discontinuous mode operation is recommended for most applications. driver and output switch to aid in system design flexibility and conversion efficiency, two output driver options are provided. the mc33466hxxjt1 converters have an internal drive transistor which is capable of sinking currents greater than 60 ma into the lx pin. an internal v lx limiter circuit senses if the lx pin voltage exceeds 1.0 v during t on and turns off the drive transistor. the mc33466hxxlt1 provides output drive for an external transistor. applications the following converter applications show the simplicity and flexibility of the converter architecture. three main converter topologies are demonstrated in figures 22 through 26. figure 22. mc33466h50jt1 typical stepup application mbrd520lt1 v in 3 v o lx gnd mc33466h50jt1 22 m f 120 m h 1 v o 2 22 m f figure 23. mc33466h50lt1 typical stepup application mbrd520lt1 v in 3 mmbt2222alt1 300 v o ext gnd mc33466h50lt1 100 m f 28 m h 0.01 m f 1 v o 5.0 v 2 22 m f
mc33466 http://onsemi.com 9 figure 24. mc33466h33jt1 stepdown application drive 100 330 m f v lx limiter 3 v ref gnd pwm controller 50 khz oscillator 2 v o 3.3 v 320 ma 1.0 k v in mbrd0520lt1 47 m h 1.5 k 3.3 v 330 m f mc33466h33jt1 mmbt2907alt1 1 mmbt2222alt1 bzx84c3v3lt1 startup circuit lx output 330 m f soft-start phase comp test condition results line regulation v in = 5.0 v to 10 v, i o = 320 ma 7.0 mv = 0.1% load regulation v in = 7.0 v, i o = 3.3 ma to 320 ma 3.0 mv = 0.04% output ripple v in = 7.0 v, i o = 320 ma 70 mvpp efficiency v in = 7.0 v, i o = 320 ma 63.8%
mc33466 http://onsemi.com 10 drive v lx limiter v ref gnd pwm controller 50 khz oscillator 2 mc33466h33jt1 1 output soft-start phase comp figure 25. micropower stepdown application 100 100 m f 3 v o 3.3 v 300 ma 1.0 k v in 5.0 v mbrd0520lt1 1 100 m f mmbt2907alt1 mmbt2222alt1 mc33464n-30atr startup circuit in out gnd 10 k 3 2 47 m h lx 10 k note: using the mc33464n30atr reduces current drawn in the startup circuit to 1 ma during normal operation.
mc33466 http://onsemi.com 11 figure 26. flyback application 100 100 m f v o 3.3 v 1.0 k v in 1.5 k 3.3 v mc33466h33jt1 mmbt2907alt1 mmbt2222alt1 startup circuit 100 m f drive v lx limiter v ref gnd pwm controller 50 khz oscillator 2 1 output soft-start phase comp 3 lx
mc33466 http://onsemi.com 12 calculation stepdown stepup flyback l (v in v o )(t on ) 2i o (v in )(t on ) 2i in (v in )(t on ) 2i in t on d fs d fs d fs d (v o ) (v in ) (v o v in ) (v o ) v o ns np
(v in ) v o i l(avg) i o i in i in i l(pk) (v in v o )(t on ) l (v in v sat )(t on ) l (v in v sat )(t on ) l v ripple(pp) i l(pk) 1 8fsc o
2 ( esr ) 2 1 2 the following converter design characteristics must be chosen: v in nominal operating dc input voltage v o desired dc output voltage i o desired dc output current v ripple(pp) desired peaktopeak output ripple voltage. for best performance the ripple voltage should be kept to a low value since it will directly affect line and load regulation. capacitor c o should be a low equivalent series resistance (esr) electrolytic designed for switching regulator applications. d operating duty cycle = t on (fs). this parameter must be chosen to be <0.5 for stepup and flyback applications. notes: 1. v sat saturation voltage of the switching transistor. 2. i in dc input switch. 3. fs switching frequency, nominally 50 khz. 4. r o load resistance. r o = v o /i o . 5. ns, np in flyback applications ns is the number of turns of the secondary transformer winding; np is the number of the primary winding turns. figure 27. design equations design example stepdown application required: v in = 8.0 v, an output voltage of 3.3 v at 300 ma is desired with an output ripple of less than 300 mvpp. r o v o i o 11 1. because this is a discontinuous mode design, d v o v in 3.3 8 0.41. choose d = 0.33. 2. t on d fs 0.33 (50 khz) 6.6 m s. 3. l (v in v o )(t on ) 2i o (8 3.3)(6.6 m s) [2(0.3)] 51.7 m h. choose l = 47 m h. coilcraft part number do3316p473. 4. i l(pk) (v in v o )(t on ) l (8 3.3)(6.6 m s) (47 m h) 660 ma. 5. esr v ripple(pp) i l(pk) (300 mv) (660 ma) 0.455 . choose c o = two parallel avx 330 m f tantalum chip capacitors. part number taje337m006. specified maximum esr for each is 0.9 w . the complete design schematic is shown in figure 24.
mc33466 http://onsemi.com 13 ordering information device output voltage type operating temperature range package shipping mc33466h30jt1 3.0 it mc33466h33jt1 3.3 int. switch mc33466h50jt1 5.0 switch t =30 to +80 c sot 89 1000 ta p e & reel mc33466h30lt1 3.0 ext. t a = 30 to +80 c sot89 1000 tape & reel mc33466h33lt1 3.3 ext . switch di mc33466h50lt1 5.0 drive other voltages from 2.5 v to 7.5 v, in 0.1 v increments are available. consult factory for information.
mc33466 http://onsemi.com 14 package dimensions sot89 h suffix case 121302 issue c k l g h m 0.10 t s b s a m 0.10 t s b s a d e 2 pl c j a b f t seating plane notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeters 3. 1213-01 obsolete, new standard 1213-02. dim a min max min max inches 4.40 4.60 0.173 0.181 millimeters b 2.40 2.60 0.094 0.102 c 1.40 1.60 0.055 0.063 d 0.37 0.57 0.015 0.022 e 0.32 0.52 0.013 0.020 f 1.50 1.83 0.059 0.072 g 1.50 bsc 0.059 bsc h 3.00 bsc 0.118 bsc j 0.30 0.50 0.012 0.020 k 0.80 --- 0.031 --- l --- 4.25 --- 0.167
mc33466 http://onsemi.com 15 notes
mc33466 http://onsemi.com 16 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthori zed use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. mc33466/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada

▲Up To Search▲

Price & Availability of MC33466-D

	To Download MC33466-D Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .