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www.fairchildsemi.com rev. 1.1.2 4/19/02 features 85% ef?iency at 50ma 900mv start-up voltage ?.5% output accuracy only 3 external components required 50, 100 and 180khz versions available 0.5? supply current in shutdown mode external transistor option supports up to 1a load currents applications cellular phones, pagers portable cameras and video recorders palmtops and pdas battery powered systems description the ilc6370 is a compact 50ma boost converter offered in a 5-lead sot-89 package. only three external components are needed to complete the switcher design, and frequency options of 50, 100, and 180khz give the designer the ability to accommodate a wide range of system objectives, includ- ing size, electromagnetic interference requirements and so on. 87% max duty cycle gives conversion ef?iencies of 85%. standard voltage options of 2.5v, 3.3v, and 5.0v at ?.5% accuracy feature on-chip phase compensation and soft-start design. the ilc6371 is designed to drive an external transistor for high current switching regulators applications with all the features and bene?s of the ilc6370 retained. block diagram v lx limiter pwm controlled buffer l x v ss ext + - chip enable osc 50/100/180khz v dd v out ce loop comp v ref slow start v dd is internally connected to the v out pin. ilc6370/6371 super small switching regulator with shutdown
ilc6370/6371 2 rev. 1.1.2 4/19/02 pin assignments absolute maximum ratings t a = 25?c, unless otherwise stated electrical characteristics ilc6370bp-50 unless otherwise speci?d v out = v en = 5v, v in = 0.6 x v out , i out = 50ma, f osc = 100 khz, t a = 25?, test circuit figure 1. parameter symbol ratings units v out input voltage pin v out 12 v ce input voltage v ce 12 v voltage on pin lx v lx 12 v current on pin lx i lx 400 ma voltage on pin ext v ext 0.3~v out + 0.3 v current pin ext i ext ?0 ma continuous total power dissipation (sot-89-5) p d 500 mw operating ambient temperature t opr -40 ~ +85 ? storage temperature t stg -40 ~ +125 ? parameter symbol conditions min. typ. max. units output voltage v out 4.875 5.0 5.125 v input voltage v in 10 v oscillation startup voltage v st1 no external components. apply voltage to v out . lx: 10k ? pull-up to 5v 0.8 v operation startup voltage v st2 external components connected. i out = 1ma 0.9 v supply current 1 i dd1 same as v st1 . apply v out = 4.75v 80.2 133.8 ? supply current 2 i dd2 same as v st1 . v out = 5.5v 8.2 16.5 ? lx switch-on resistance r swon same as i dd1 . v lx = 0.4v 1.4 2.4 ? lx leakage current i lxl no external components. v out = v lx = 10v 1.0 ? oscillator frequency f osc same as i dd1 . 85 100 115 khz maximum duty ratio maxdty same as i dd1 . 808792 % stand-by current i stb same as i dd1 . 0.5 ? ce ?igh?voltage v ceh same as i dd1 . existence of lx oscillation 0.75 v ce ?ow?voltage v cel same as i dd1 . disappearance of lx oscillation 0.2 v ce ?igh?current i ceh same as i dd1 . v ce = 4.75v 0.25 ? ce ?ow?current i cel same as i dd1 . v ce = 0v -0.25 ? efficiency eff 85 % slow start time t ss 4.0 10.0 20.0 ms sot-89-5 (top view) 13 2 v out ce l x 4 5 v ss n/c sot-89-5 (top view) 13 2 v out ce ext 4 5 v ss n/c ilc6370 ilc6371
ilc6370/6371 rev. 1.1.2 4/19/02 3 electrical characteristics ilc6371bp-50 unless otherwise speci?d v out = v en = 5v, v in = 0.6 x v out , i out = 50ma, f osc = 100 khz, t a = 25?, test circuit figure 2. parameter symbol conditions min. typ. max. units output voltage v out 4.875 5.0 5.125 v input voltage v in 10 v oscillation startup voltage v st1 no external components. apply voltage to v out . 0.8 v operation startup voltage v st2 external components connected. i out = 1ma 0.9 v supply current 1 i dd1 same as v st1 . apply v out = 4.75v 40.0 66.8 ? supply current 2 i dd2 same as v st1 . v out = 5.5v 8.2 16.5 ? ext ?igh?on resistance r exth same as i dd1 . v ext = 0.4v 37.5 62.5 ? ext ?ow?on resistance r extl same as i dd1 . v ext = 0.4v 30 50 ? oscillator frequency f osc same as i dd1 . 85 100 115 khz maximum duty ratio maxdty same as i dd1 . 808792 % stand-by current i stb same as i dd1 . 0.5 ? ce ?igh?voltage v ceh same as i dd1 . existence of lx oscillation 0.75 v ce ?ow?voltage v cel same as i dd1 . disappearance of lx oscillation 0.2 v ce ?igh?current i ceh same as i dd1 . v ce = 4.75v 0.25 ? ce ?ow?current i cel same as i dd1 . v ce = 0v -0.25 ? efficiency eff 85 % slow start time t ss 4.0 10.0 20.0 ms
ilc6370/6371 4 rev. 1.1.2 4/19/02 applications circuits figure 1. test circuit figure 2. test circuit ilc6370 1 2 3 4 5 ce v out c l + gnd v in l sd l: 100h sd: schottky diode c l : 47f 16v (ceramic or tantalum capacitor) ilc6371 1 2 3 4 5 ce v out c l + l sd v in gnd c b r b tr l: 100h sd: schottky diode c l : 47f 16v (ceramic or tantalum capacitor) r b : 1k ? c b : 3300pf tr: 2sc3279, 2sdi628g
ilc6370/6371 rev. 1.1.2 4/19/02 5 functions and operation the ilc6370 performs boost dc-dc conversion by control- ling the switch element shown in the circuit below. when the switch is closed, energy is built up in the inductor. when the switch opens, this energy is forced to pass through the diode to the output. as the on and off cycles continue, the output capacitor voltage builds up due to energy being transferred from the inductor consequently, the output voltage is boosted with respect to input. the ilc6370/6371 monitors the voltage on the output capacitor in order to determine how much energy should be transferred through the switch. in general, the switching characteristic is determined by the desired output voltage and the required load current. speci? cally, the energy transfer is determined by the energy stored in the coil during each switching cycle. el = ?t on , v in ) where el is the energy stored in the inductor, t on is the on time and v in is the input voltage. the ilc6370/6371 use a pulse width modulation (pwm) technique. the devices are offered with one of three ?ed internal frequencies: 50, 100, or 180khz. the switches are continuously driven at these frequencies. the control cir- cuitry varies the power being delivered to the load by varying the on-time, or duty cycle, of the switch. since more on-time translates to higher energy built up in the inductor, the maximum duty cycle of the switch determines the maximum load current that the device can support. the ilc6370 and ilc6371 both support up to 87% duty cycles, for maximum usable range of load currents. the internal bias (v od ) is provided by the output voltage v out .. there are two key advantages of pwm type controllers. first, because the controller automatically varies the duty cycle of the switchs on-time in response to changing load conditions, the pwm controller will always have an optimized waveform for a steady-state load. this translates to very good ef?iency at high currents and minimal ripple on the output. [ripple is due to the output capacitor con- stantly accepting and storing the charge received from the inductor, and delivering charge as required by the load. the ?umping?action of the switch produces a sawtooth-shaped voltage as seen at the output.] the other key advantage of the pwm type controllers is that the radiated noise due to the switching transients will always occur at a ?ed switching frequency. many applications are insensitive to switching noise, but certain types of applica- tions, especially communication equipment, need to mini- mize the high frequency interference within their system as much as is possible. using a boost converter requires a cer- tain amount of high frequency noise to be generated; using a pwm converter makes that noise spectrum predictable; thus it is easier to ?ter it. there are downsides of pwm approaches, especially at very low currents. since the pwm techniques rely on constant switching and varying duty cycle to match the load condi- tions, there is a minimum load current that can be handled ef?iently. if the ilc6370/6371 had an ideal switch, this would not be such a problem. but an actual switch consumes some ?ite amount of current to switch on and off; at very low current this can be of the same magnitude as the load current itself, driving switching ef?iencies down to 50% and below. the other limitation of pwm techniques is that, while the fundamental switching frequency is easier to ?ter out since its constant, the higher order harmonics of pwm will be present and may have to be ?tered out as well. filtering requirements will vary by application and by actual system design and layout, so generalization in this area is dif?ult, at best. [for other boost converter techniques, please refer to the ilc6380/81 and ilc6390/91 data sheets.] nevertheless, pwm control for boost dc-dc conversion is widely used, especially in audio-noise sensitive applications or applica- tions requiring strict ?tering of the high frequency compo- nents. fairchilds products give very good ef?iencies of 85% at 50ma output (5v operation), 87% maximum duty cycles for high load conditions, while maintaining very low shutdown current levels of 0.5?. the only difference between the ilc6370 and ilc6371 parts is that the 6371 is con?ured to drive an external transistor as the switch element. since larger transistors can be selected for this element, higher effective loads can be regulated. start-up mode the ilc6370 has an internal soft-start mode which suppresses ringing or overshoot on the output during start-up. the following diagram illustrates this start-up conditions typical performance. v in - v f v out min t soft-start (~10msec) t = 0
ilc6370/6371 6 rev. 1.1.2 4/19/02 external components and layout consideration the ilc6370 is designed to provide a complete dc-dc convertor solution with a minimum of external components. ideally, only three externals are required: the inductor, a pass diode, and an output capacitor. the inductor needs to be of low dc resistance type, typically 1 ? value. toroidal wound inductors have better ?ld containment (less high frequency noise radiated out) but tend to be more expensive. some manufacturers such as muruta and coilcraft have new bobbin-wound inductors with shielding included, which may be an ideal ? for these applications. contact the manufacturer for more information. the inductor size needs to be in the range of 47? to 1mh. in general, larger inductor sizes deliver less current, so the load current will determine the inductor size used. for load currents higher than 10ma, use an inductor from 47? to 100?. for load currents of about 5ma (pagers for example), use of an inductor in the range of 100? to 330? is desirable. for even lighter loads, an inductor of up to 1mh can be used. the use of a larger inductor will increase overall conversion ef?iency due to the reduction in switching currents. for the ilc6371, using an external transistor, the use of a 47? inductor is recommended based on our experience with the part. note that these values are recommended for both 50khz and 100khz operation. if the ilc6370 or ilc6371 is used at 180khz switching frequencies, the inductor size can be reduced to approximately half of these stated values. the capacitor should, in general, be ceramic or tantalum type, as they have much better esr and temperature stability than other capacitor types. never use electrolytics or chemical caps, as the capacitor value changes dramatically below 0?c and the overall design may become unstable. different capacitor values will directly impact the ripple voltage seen on the output at a given load current due to the direct charge-to-voltage relationship of this element. differ- ent capacitor values will also indirectly affect system reli- ability, as the lifetime of the capacitor can be degraded by constant high current in?x and out?x. running a capacitor near its maximum rated voltage can deteriorate lifetime as well; this is especially true for tantalum caps which are par- ticularly sensitive to overvoltage conditions. the diode must be of schottky type for fast recovery and minimal loss. a diode rated at greater than 200ma and maximum voltage greater than 30v is recommended for fast switching time and best reliability over time. different diodes may introduce different level of high frequency switching noise into the output waveform so trying out several sources may be desirable. for the ilc6371, much of the component selection is as described above, with the addition of the external npn transistor and the base drive network. the transistor needs to be of npn type, and should be rated for currents of 2a or more. [this translates to lower effective on resistance and, therefore, higher overall ef?iencies.] the base components should remain at 1k ? and 3300pf; any changes need to be veri?d prior to implementation. as for actual physical component layout, in general, the more compact the layout is, the better the overall perfor- mance will be. it is important to remember that everything in the circuit depends on a common and solid ground reference. ground bounce can directly affect the output regulation and presents dif?ult behavior to predict. keeping all ground traces wide will eliminate ground bounce problems. it is also critical that the ground pin of c l and v ss pin of the device be the same pin on the board, as this capacitor serves two functions: that of the output load capacitor, and that of the input supply bypass capacitor. layouts for dc-dc converter designs are critical for overall performance, but following these simple guidelines can simplify the task by avoiding some of the more common mistakes made in these cases. once actual performance is completed, be sure to double check the design on an actual manufacturing prototype product to verify that nothing has changed which can affect the performance.
ilc6370/6371 rev. 1.1.2 4/19/02 7 typical performance characteristics (general conditions for all curves) output current i out (ma) 0 4.4 output voltage v out (v) 4.8 100 5.2 200 500 v in =1.0v 5.0 4.6 4.2 4.0 300 400 l=100h c=47f(tantalum) v in =2.0v v in =3.0v v in =4.0v 5.4 output voltage vs output current ilc6370cp-50 output current i out (ma) 0 2.7 output voltage v out (v) 2.9 40 3.1 80 200 3.0 2.8 2.6 120 160 l=100h c=47f(tantalum) 3.2 output voltage vs output current ilc6370cp-30 output current i out (ma) 0 40 efficiency: effi (%) 80 100 200 500 100 60 20 0 300 400 l=100h c=47f(tantalum) v in =1.0v v in =2.0v v in =4.0v v in =3.0v efficiency vs output current ilc6370cp-50 output current i out (ma) 0 40 efficiency: effi (%) 80 40 80 200 100 60 20 0 120 160 l=100h c=47f(tantalum) v in =1.0v v in =1.5v v in =2.0v efficiency vs output current ilc6370cp-30 output current i out (ma) 0 40 ripple vr (mv p-p ) 80 100 200 v in =0.9v 100 60 20 0 300 400 l=100h c=47f(tantalum) v in =4.0v v in =3.0v ripple voltage vs output current ilc6370cp-50 v in =2.0v output current i out (ma) 0 40 ripple vr (mv p-p ) 80 50 100 v in =1.0v 100 60 20 0 150 200 l=100h c=47f(tantalum) v in =1.5v v in =2.0v ripple voltage vs output current ilc6370cp-30 input voltage v in (v) 200 input current ( m a) 400 1 2 500 300 100 0 3 4 input voltage vs input current ilc6370cp-50, no load current 600 l=100h c=47f(tantalum) input voltage v in (v) 1.0 100 input current ( m a) 200 1.2 1.4 2.0 250 150 50 0 1.6 1.8 l=100h input voltage vs input current ilc6370cp-30, no load current c=47f(tantalum) v in =1.0v v in =1.5v v in =2.0v
ilc6370/6371 8 rev. 1.1.2 4/19/02 typical performance characteristics (general conditions for all curves) time ( sec) -20 4.0 6.0 060 7.0 5.0 3.0 20 40 l=100h v in =3.0v ilc6370cp-50 output voltage v out (v) transient response output current i out (ma) 0.4 v st , v hld ( v ) 0.8 0 10 1.0 0.6 0.2 0 20 30 start voltage/hold voltage vs i out ilc6370cp-50 1.2 v st v hld c=47f(tantalum) 80 i out =1ma~30ma
ilc6370/6371 rev. 1.1.2 4/19/02 9 package dimensions 5-lead sot-89 4.5 0.1 1.5 0.1 0.4 0.1 0. units: mm 4 0.1 1.6 0.2 1.5 0.1 1.5 0.1 0.1 0.1 0.1 2.5 0.1 0.42 0.1 ? 1.0 5 4 12 3 0.4 0.9 min. +0.5 0.3 4.5 0.42 0.47 0.42
ilc6370/6371 4/19/02 0.0m 001 stock#ds30006370 ? 2002 fairchild semiconductor corporation life support policy fairchild s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. ordering information part number output voltage @ switching frequency ilc6370cp25x 2.5v 2.5%@50khz ilc6370cp33x 3.3v 2.5%@50khz ilc6370cp50x 5.0v 2.5%@50khz ilc6370bp25x 2.5v 2.5%@100khz ilc6370bp30x 3.0v 2.5%@100khz ilc6370bp33x 3.3v 2.5%@100khz ilc6370bp50x 5.0v 2.5%@100khz ilc6370bp53x 5.3v 2.5%@100khz ilc6370ap25x 2.5v 2.5%@180khz ILC6370AP33X 3.3v 2.5%@180khz ilc6370ap50x 5.0v 2.5%@180khz ilc6370ap52x 5.2v 2.5%@180khz ilc6371cp25x 2.5v 2.5%@50khz ilc6371cp33x 3.3v 2.5%@50khz ilc6371cp50x 5.0v 2.5%@50khz ilc6371bp25x 2.5v 2.5%@100khz ilc6371bp33x 3.3v 2.5%@100khz ilc6371bp50x 5.0v 2.5%@100khz ilc6371ap25x 2.5v 2.5%@180khz ilc6371ap33x 3.3v 2.5%@180khz ilc6371ap50x 5.0v 2.5%@180khz standard product offering comes in tape and reel, quantity 1000 per reel, orientation right for sot-89
product folder - fairchild p/n ilc6370ap50 - product information fairchild semiconductor space space space search | parametric | cross reference space product folders and datasheets application notes space space space find products home >> find products >> space space space space products groups space analog and mixed signal discrete interface logic microcontrollers non-volatile memory optoelectronics markets and applications new products product selection and parametric search cross-reference search technical information buy products technical support my fairchild company ilc6370ap50 product information related links request samples dotted line how to order products dotted line product change notices (pcns) dotted line support dotted line distributor and field sales representatives dotted line quality and reliability dotted line design tools contents general description | features | applications | product status/pricing/packaging general description the ilc6370 is a compact 50ma boost converter offered in a 5-lead sot-89 package. only three external components are needed to complete the switcher design, and frequency options of 50, 100, and 180khz give the designer the ability to accommodate a wide range of system objectives, including size, electromagnetic interference requirements and so on. 87% max duty cycle gives conversion efficiencies of 85%. standard voltage options of 2.5v, 3.3v, and 5.0v at 2.5% accuracy feature on-chip phase compensation and soft-start design. the ilc6371 is designed to drive an external transistor for high current switching regulators applications with all the features and benefits of the ilc6370 retained. back to top features space datasheet download this datasheet pdf e-mail this datasheet [e- mail] this page print version file:///d|/html/ilc6370ap50.html (1 of 2) [7/26/02 5:10:39 pm]
product folder - fairchild p/n ilc6370ap50 - product information l 85% efficiency at 50ma l 900mv start-up voltage l 2.5% accurate outputs l only 3 external components required l 50, 100 and 180khz switching frequency versions available l 0.5a supply current in shutdown mode l external transistor option supports up to 1a load currents back to top applications l cellular phones, pagers l portable cameras and video recorders l palmtops and pdas l battery powered systems back to top product status/pricing/packaging product product status pricing* leads packing method ilc6370ap50x full production $1.89 3 tape reel * 1,000 piece budgetary pricing back to top space space home | find products | technical information | buy products | support | company | contact us | site index | privacy policy ? copyright 2002 fairchild semiconductor space space file:///d|/html/ilc6370ap50.html (2 of 2) [7/26/02 5:10:39 pm]

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