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aic2510 3a step-down pwm converter analog integrations corporation 3a1, no.1 li-hsin rd. i, science park, hsinchu 300, taiwan ds-2510g-01 092408 tel: 886-3-5772500 fax: 886-3-5772510 www.analog.com.tw 1 features operating input voltage from 4.5v to 30v 3.3v, 5v, 12v and adjustable output version adjustable version output voltage range, 1.2v to 30v 4% max over line and load regulation available in to-263-5, to-220-5 and to-220b package requires only 4 external components 150khz fixed constant frequency low power standby mode, i q typically 80 a ttl shutdown capability current limit and thermal shutdown protection 3a guaranteed output load current applications fixed voltage power supply for lcd monitor and lcd tv on-card switching regulators simple high efficiency step-down regulator general description the aic2510 series are step-down monolithic pwm converters for delivering 3a at fixed voltages of 3.3v, 5.0v, 12v and using an external divider to adjust output voltage from 1.2v to 30v with excellent line and load regulation. switching frequency up to 150khz is achievable thus allowing smaller-sized filter components. internal current limit and thermal shutdown circuits provide protection from overloads. the internal precise reference combined with v oltage feedback loop provides optimum output voltage accuracy and fast load transient response. typical application circuit l1 r1 r2 + c2 + c1 d1 v out v in in 1 on/off 5 out 2 fb 4 3 gnd aic 2510 r1 short, r2 and cf open for fixed version cf c1: electrolyte capacitor 470uf c2: electrolyte capacitor 220uf cf:refer to table1 d1: sk54 l1:33uh
aic2510 2 ordering information packing type tr: tape & reel tb: tube package type m5 : to-263-5 t5 : to-220-5 b5 : to-220b p: lead free commercial g: green package output voltage default : adj 33 : 3.3v 50 : 5.0v 12 : 12.0v aic2510- xx xxx xx example: aic2510-50pm5tr 5.0v output version, in lead free to-263- 5 package & taping & reel packing type aic2510-33pb5tr 3.3v output version, in lead free to-220b package & taping & reel packing type order number pin configuration aic 2510pm5 aic 2510-33pm5 aic 2510-50pm5 aic 2510-12pm5 to-263-5 front view 1: in 2. out 3. gnd 4. fb 5. o n/off 1 2 4 5 3 aic 2510pt5 aic 2510-33pt5 aic 2510-50pt5 aic 2510-12pt5 to-220-5 front view 1: in 2. out 3. gnd 4. fb 5. on/off 1 2 3 4 5 to-220b front view 1: in 2. out 3. gnd 4. fb 5. on/off aic 2510pb5 aic 2510-33pb5 aic 2510-50pb5 aic 2510-12pb5 1 2 3 4 5 absolute maximum ratings supply voltage 30v fb, on/off pin input voltage -0.3v to 30v operating temperature range -40 c ~ 85 c storage temperature range -65 c ~ 150 c junction temperature 125 c lead temperature (soldering 10sec.) 260 c thermal resistance junction to case to-263-5, to-220-5, to-220b 3 c/w thermal resistance junction to ambient to-263-5 60 c/w (assume no ambient airflow, no heatsink) to-220-5, to-220b 50 c/w absolute maximum ratings are those values beyond which the life of a device may be impaired.
aic2510 3 electrical characteristics (t a =25 c, v in =12v for the 3.3v, 5v and adjustable version and v in =24v for the 12v version.) (note1) parameter test conditions min. typ. max. unit input voltage 4.5 30 v fixed output voltage aic2510-33 (v in > 4.75v) 3.168 3.432 v aic2510-50 (v in > 7.0v) 4.800 5.200 v aic2510-12 (v in > 15v) 11.52 12.48 v fb reference voltage 1.193 1.267 v saturation voltage 1.2 1.4 v output voltage regulation 4 % quiescent current internal switch off 5 10 ma shutdown quiescent current on/off= 5v (off) 80 200 a fb bias current v fb =1.3 10 50 na output leakage current vout=-0.9 2 30 ma logic input high (regulator off) 2.0 v logic input low (regulator on) 0.6 v oscillator frequency 130 150 180 khz output current limit 3.6 5.5 a maximum duty cycle 100 % minimum duty cycle 0 % efficiency vo=5v, io=3a 80 % note 1: specifications are production tested at t a =25 c. specifications over the -40 c to 85 c operating temperature range are assured by design, characterization and correlation with statistical quality controls (sqc).
aic2510 4 typical performance characteristics 10 100 1000 20 25 30 35 40 45 50 55 60 65 70 75 80 85 vin=24v vout=3.3v version vin=18v vin=12v vin=5v efficiency (%) load current (ma) 10 100 1000 25 30 35 40 45 50 55 60 65 70 75 80 85 90 vin=24v vout=5.0v version vin=30v vin=18v vin=12v efficiency (%) load current (ma) fig.1 3.3v version efficiency fig.2 5v version efficiency 10 100 1000 45 50 55 60 65 70 75 80 85 90 95 vin=18v vout=12.0v version vin=30v vin=24v efficiency (%) load current (ma) 5 10 15 20 25 30 25 30 35 40 45 50 55 60 65 70 75 80 85 90 vout=3.3v vout=5.0v vout=12v case tempearature ( o c) input voltage (v) fig.3 12v version efficiency fig.4 case temperature vs. input voltage -60 -40 -20 0 20 40 60 80 100 100 110 120 130 140 150 160 170 180 190 200 switching frequency (khz) t j ( o c) -60 -40 -20 0 20 40 60 80 100 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 6.0 6.4 6.8 current limit (a) current limit vs. temperature fig.5 switching frequency vs. temperature fig.6 current limit vs. temperature i out =3a to-263-5
aic2510 5 typical performance characteristics (continued) -60 -40 -20 0 20 40 60 80 100 120 140 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 3a 1a dropout voltage (vlot) tj ( o c) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 100 o c -40 o c 25 o c saturation voltage (volt) switch current (a) fig.7 dropout voltage vs. temperature fig.8 switching saturation voltage vs. switch current -60 -40 -20 0 20 40 60 80 100 120 140 0.0 0.5 1.0 1.5 2.0 2.5 on off on/off threshold voltage (volt) tj ( o c) -60 -40 -20 0 20 40 60 80 100 120 140 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 i load =120ma v fb =1.23v minimum supply voltage (volt) tj ( o c) fig.9 on/off threshold voltage vs. temperature fig.10 minimum operating supply voltage vs. temperature (adj only) 0 5 10 15 20 25 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40 o c < tj < 125 o c vin = 30v current (ua) on/off pin voltage (volt) 3a i out 0.1a vout 100mv/div vin=12v vout=5v fig.11 off/on pin current (sinking) vs. temperature fig.12 load transient response
aic2510 6 typical performance characteristics (continued) fig.13 fb pin ripple(ccm) fig.14 fb pin ripple(dcm) block diagram in fb out comp. comp. gnd 2.6v regulator 1.23 v reference driver compensation circuit shdn on / off amp. 150khz osc current limit latch thermal shutdown
aic2510 7 pin descriptions pin 1: in supply voltage input for the ic switching regulator. a suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator. pin 2: out internal switch. the voltage at this pin switches between (v in -v sat ) and approximately -0.5v, with a duty cycle of approximately v out /v in . pin 3: gnd ground requires a short, low noise connection to ensure good load regulation. pin 4: fb feedback input for fixed-output or adjustable-output version. connect directly to output for fixed operation version or to a resistor divider for adjustable operation versions. pin 5: off/on allows the switching regulator c ircuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 80 a. drive it high to disable the reference, control circuitry and internal switches. drive low or connect to gnd for normal operation. application information thermal considerations the aic2510 is available with to-220-5, to220b and to-263-5 packages. the to-220-5 and to220b packages need a heat sink in most conditions. the to-263-5 package is designed to be soldered to the copper on a printed circuit board. the printed circuit board is the heat sink for to-263-5 package and other heat components, such as inductors and diodes. the size of the heat sink depends on the power loss of aic2510 and the ambient temperature. the power loss of aic2510 is determined by input voltage, output voltage and load current. the fig.4 represents the c urve of the aic2510 case temperature in different conditions. the curve shows the aic2510 temperature rises above ambient temperature for a 3a load with different input and output voltage. the values of the temperature rise, which are affected by factors such as sink size, heat produced from heat components, and etc., may be different from those in fig.8 depending on the conditions of the a pplication. according to the equation 1, as the p ower loss or ambient temperature is rising the heat sink size must be increased to decrease the thermal resistance ( ja r ) so that the junction temperature does not over 125 c. an appropriate increase of heat sink size may result in a normal- ranged junction temperature. ja aj d r tt p ? = as junction temperature rises to its temperature protect point, the aic2510 will stop working. output voltage drops to zero until the junction temperature decreases to a normal range.
aic2510 8 application information (continued) components selection inductor the inductor selection depends on the operating frequency of the aic2510. the ripple current ? i l interrelates with inductor value. a lower inductor value gets a higher ripple current. besides, a higher v in or v out can also get the same result. the inductor value can be calculated as the following formula. ( )( ) ? ? ? ? ? ? ? ? ? ? = in out out l v v 1v if 1 l users can define the acceptable ? i l to gain a suitable inductor value. diode the diode current rating must be higher than 1.3 times maximum load current. also, if the power supply needs to resist a continuous output short, the diode should have a current ration equal to the maximum current limit of the aic2510. the reverse voltage rating of the diode should be higher than 1.25 times input voltage and the diode must be fast. the reverse recovery time of the diode is short. capacitor the selection of output capacitor depends on the suitable ripple voltage. lower ripple voltage corresponds to lower esr (equivalent series resistor) of output capacitor. typically, once the esr is satisfied with the ripple voltage, the value of capacitor is adequate for filtering. the formula of ripple voltage is as below: ? ? ? ? ? ? ? ? +?=? out l out fc8 1 esriv the typical input capacitor is 470uf. but as the temperature decreases, the input capacitor needs to increase to stabilize the circuit. example assume the input voltage is 12v, output voltage is 5v and maximum load current is 3a. the output ripple must be smaller than 2% of output voltage inductor selection: ( )( ) ? ? ? ? ? ? ? ? ? ? = in out out l v v v if l 1 1 uh k 4.32 12 5 15 6.0150 1 = ? ? ? ? ? ? ? = here, the delta i l is 0.6a. so we choose 33uh inductor. output capacitor selection: mv fc esriv out l out 100 8 1 < ? ? ? ? ? ? ? ? +?=? we choice the capacitor value: esr=0.12, capacitance=220uf mv mv fc esriv out l out 10074 8 1 <= ? ? ? ? ? ? ? ? +?=? ? diode selection: the full load is 3a and delta i l is 0.6a, so the diode current rating must be higher than 3.6a. cf capacitor for adj version as using the aic2510 adj version, the cf capacitor is required to provide additional stability. in different condition, the cf capacitor must be changed to make the circuit stable. output voltage (v) input voltage (v) r1 ( ) r2 ( ) cf (pf) 1.8 7 36k 82k 1000 4 12 180k 82k 360 6 12 180k 47k 360 8 15 180k 33k 360 10 18 150k 22k 470 15 25 110k 10k 560 table 1
aic2510 9 physical dimensions (unit: mm) t o-263-5 note: 1. refer to jedec to-263ba. 2. dimension "e" does not include mold flash, protrusions or gate burrs. mold flash, protrusion or gate burrs shall not exceed 6 mil per side . 3. dimension "d" does not include inter-lead flash or protrusions. 4. controlling dimension is millimeter, converted inch dimensions are not necessarily exact. e l view b l 3 gauge plane a 1 seating plane with plating base metal section a-a b see view b c e a a h d l 1 a c2 8.38 0 0.51 1.78 14.61 9.65 1.14 0.38 0.00 h q l3 l1 l c2 e e d c b a1 15.88 8 1.68 2.79 0.25 bsc 0.99 10.67 9.65 1.65 0.74 0.25 1.70 bsc 4.06 min. s y m b o l a 4.83 max. to-263-5l millimeters --
aic2510 10 physical dimensions(continued) (unit: mm) t o-220b note : controlling dimension is millimeter, converted inch dimensions are not necessarily exact. e l l 1 b e1 e d d e1 e1 d 1 f a c a1 a2 9.880 3.708 0.304 1.143 8.250 4.250 9.906 8.480 0.690 l f e1 e a2 d1 e1 a1 e d c b 3.962 10.64 7.112 1.397 8.550 0.530 4.550 10.44 9.300 0.940 4.318 min. s y m b o l a 4.826 max. to-220b millimeters d 6.604 l1 9.090 9.850 4.953 5.220 3.556(ref) 2.743(ref) 1.524 2.032
aic2510 11 t o-220-5l note: information provided by aic is believed to be accurate and reliable. however, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an aic product; nor for any infringement of patents or other rights of third parties that may result from its use. we reserve the right to change the circuitry and specifications without notice. life support policy: aic does not authorize any aic product for use in life support devices and/or systems. life support devices or systems are devices or systems which, (i) are intended for surgical implant into the body or (ii) support or sustain life, and 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 to the user. e d d e1 e1 a l d 1 f a1 e b c note : controlling dimension is millimeter, converted inch dimensions are not necessarily exact. 3.429 3.683 2.620 2.870 1.524 2.032 13.589 3.708 0.304 1.143 2.032 9.779 7.620 0.635 l f e d1 e1 a1 e d c b 3.962 14.351 1.397 0.460 2.921 10.668 9.398 1.016 4.064 min. s y m b o l a 4 .826 max. to-220-5l millimeters d 4.953 5 .220

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