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lt3003 1 3003fa typical application features applications description led1 8 3 = 24 leds 350ma per string v max shdn v in pwm led2 lt3003 led3 0.1 ? v ee gnd ot2 ot1 cap 10 h 1nf 10 f 0.33 f led v in v in 3v to 16v v c 3003 ta01a 1 f 1 f pv in 32v gnd simplified lt3476 sw pwm pwm dimming total led current (ma) 0 60 efficiency (%) 65 70 75 80 90 200 400 600 800 3003 ta01b 1000 1200 85 pv in = 32v number of leds = 8 3 = 24 3-channel led ballaster with pwm the lt ? 3003 drives three separate strings of leds up to 350ma/channel with 3% accurate current matching, resulting in uniform led brightness and intensity. this approach is superior to conventional methods of running three separate channels with external ballast resistors requiring expensive factory calibration. the lt3003 operates in boost, buck and buck-boost mode. a true color pwm dimming ratio of up to 3000:1 is achiev- able using a logic-level signal at the pwm pin for all modes without the need for external level-shifting circuitry. for applications with input supply above and below the output voltage of the led strings, the lt3003 allows the leds to be returned to the input supply (buck-boost mode) instead of being limited to only sepic solutions. the lt3003 is ideal for high power led driver applications such as tft lcd backlighting and heads-up displays. ad- ditional overtemperature outputs allow appropriate system management for increased reliability. the lt3003 is available in a small 10-pin mse package. high power led ballaster automotive lighting video cameras tft lcd backlighting 3% led current matching up to 350ma continuous current per led string up to 3000:1 true color pwm tm dimming range pwm input disconnects led strings can operate in buck, boost and buck-boost modes wide input range: 3v to 40v overtemperature outputs works with lt1618, lt3477, lt3474, lt3475, lt3476, ltc ? 3783 thermally enhanced 10-pin msop package , lt, ltc and ltm are registered trademarks of linear technology corporation. true color pwm is a trademark of linear technolology corporation. all other trademarks are the property of their respective owners. buck mode lt3003 with the lt3476 ef? ciency
lt3003 2 3003fa electrical characteristics package/order information absolute maximum ratings v in ............................................................................40v led1, led2, led3 ....................................................48v v max , shdn ..............................................................48v v in C v ee ...................................................................36v v ee ............................................................................36v pwm .........................................................................15v ot1, ot2 .....................................................................6v operating junction temperature range (notes 2, 3, 4) ........................................ C40c to 125c storage temperature range ................... C65c to 150c lead temperature (soldering, 10 sec) .................. 300c (note 1) the denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. pwm = 1v, v max = 4v, v in = 3v, v ee = 0v, i led2 = 100ma, ot1 = ot2 = open, shdn = v in . parameter conditions min typ max units v in operational input voltage v ee = 0v, i led1,2,3 = 100ma v ee = 4v, i led1,2,3 = 100ma 336 40 v v minimum (v in C v ee )v ee = 0v to 36v 2.7 3 v v in quiescent current pwm = 1v, i led1,2,3 = 100ma pwm = 0v, v led1 = v led2 = v led3 10.5 470 600 ma a v in shutdown current shdn = 0v, i led1,2,3 = 0ma 2 4 10 a v max quiescent current pwm = 1v, i led2 = 100ma pwm = 0v, v led1 = v led2 = v led3 55 20 90 300 a na shdn pin threshold i led2 = 100ma, v led1 = v led2 = v led3 0.25 0.7 1 v led current matching i led2 = 350ma, v led1 = v led2 = v led3 C3 0 +3 % |led2 C led1|, |led2 C led3| led current matching with led pin voltage mismatch i led2 = 350ma, (|v led2 C v led1 | + |v led2 C v led3 |) = 700mv C3.5 0.5 +3.5 % led pin voltage i led2 = 100ma 0.7 0.8 0.9 v led1, led2, led3 maximum current v led1,2,3 < 1.5v 375 500 550 ma led1, led2, led3 maximum leakage current pwm = 0v, v led1,2,3 = 48v 0.1 1 a pwm switching threshold i led1,2,3 = 100ma 0.3 0.5 0.7 v turn-on delay (pwm on to i led on) pwm = 0v to 1v, i led > 50ma 2 s v ee pin current in buck mode pwm = 0v, v max = 40v, v in = 39v, v ee = 36v 0.1 1 a overtemperature sense point (ot1, ot2) (note 4) 125 c overtemperature hysteresis point (note 5) C6 from overtemp sense point c ot1 pull-down current ot1 = 0.3v (note 4) 100 a 1 2 3 4 5 led1 led2 led3 v max v in 10 9 8 7 6 v ee shdn ot2 ot1 pwm top view 11 mse package 10-lead plastic msop t jmax = 125c, ja = 35c/w exposed pad (pin 11) is gnd, must be soldered to pcb order part number mse part marking LT3003EMSE ltcff order options tape and reel: add #tr lead free: add #pbf lead free tape and reel: add #trpbf lead free part marking: http://www.linear.com/leadfree/ consult ltc marketing for parts speci? ed with wider operating temperature ranges.
lt3003 3 3003fa typical performance characteristics parameter conditions min typ max units ot2 pull-down current ot2 = 0.3v (note 4) 300 a ot1, ot2 leakage current ot1 = ot2 = 5v 1 a note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: the lt3003e is guaranteed to meet performance speci? cations from 0c to 85c junction temperature. speci? cations over the C40c to 125c operating junction temperature range are assured by design, characterization and correlation with statistical process controls. note 3: this ic includes overtemperature protection that is intended to protect the device during momentary overload conditions. junction temperature will exceed 125c when overtemperature protection is active. continuous operation above the speci? ed maximum operating junction temperature may impair device reliability. note 4: correlation to static test at t a = 25c. note 5: guaranteed by design. i led1,3 to i led2 matching i led (ma) 50 35 30 25 20 15 10 5 0 200 300 3003 g02 100 150 250 350 input quiescent current (ma) t j = 27 c junction temperature ( c) ?50 0 v ee pin current ?1 (na) 50 150 200 250 500 350 0 50 75 3003 g03 100 400 450 300 ?25 25 100 125 10 s after pwm = 0 v in quiescent current vs i led v ee pin current (out of the pin) vs temperature v max pin current vs temperature v in shutdown current vs temperature (v led1,2,3 C v ee ) vs i led junction temperature ( c) ?50 0 v max pin current (na) 1 3 4 5 10 7 0 50 75 3003 g04 2 8 9 6 ?25 25 100 125 10 s after pwm = 0 junction temperature ( c) ?50 4 5 7 25 75 3003 g05 3 2 ?25 0 50 100 125 1 0 6 v in shutdown current ( a) shdn = 0 junction temperature ( c) ?50 i led1,3 vs i led2 (%) 25 3003 g01 2.0 1.0 ?25 0 50 0.5 0 3.0 2.5 1.5 75 100 125 i led1,3 ? i led2 i led2 i led2 = 350ma v led1 = v led2 = v led3 i led (ma) (v led1,2,3 ? v ee ) (mv) 1000 1050 1100 300 3003 g06 950 900 100 200 50 350 150 250 400 850 800 1150 the denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. pwm = 1v, v max = 4v, v in = 3v, v ee = 0v, i led2 = 100ma, ot1 = ot2 = open, shdn = v in . t a = 25c unless otherwise noted. electrical characteristics
lt3003 4 3003fa pin functions typical performance characteristics led1 (pin 1): controlled current input for a string of leds with a cathode lead connected to the pin. connect the ? rst string of leds to this pin. led2 (pin 2): controlled current input for a string of leds with a cathode lead connected to the pin. connect the sec- ond string of leds to this pin. led3 (pin 3): controlled current input for a string of leds with a cathode lead connected to the pin. connect the third string of leds to this pin. v max (pin 4): ? boost: connect to v out ? buck mode: connect to input supply ? buck-boost mode: connect to v out v in (pin 5): input supply, upper rail. this pin must be locally bypassed with a capacitor to ground. v in powers the internal control circuitry. ? boost: connect to input supply ? buck mode: connect to input supply ? buck-boost mode: connect to v out pwm (pin 6): input pin for pwm dimming control. a pwm signal above 0.5v (on threshold) turns the lt3003 channels on. a pwm signal below 0.5v completely discon- nects each led string. if the application does not require pwm dimming, then the pwm pin can be left either open (an internal 10a source current pulls pwm high) or it can be connected to a supply between 0.5v to 15v. ot1 (pin 7): overtemperature output. ot1 pulls 100a from the pin when the junction temperature exceeds 125c. the part has to cool down by 6c for the ? ag to reset; ideal for providing an overtemperature ? ag to the system microprocessor. ot2 (pin 8): overtemperature output. ot2 pulls 300a from the pin when the junction temperature exceeds 125c. the part has to cool down by 6c for the ? ag to reset; ideal for connecting to the switching regulator g m error ampli? er output to defeat switching. shdn (pin 9): micropower shutdown pin. below 0.7v shuts down the ic. typically i vin = 4a for shdn = 0v. ? boost: connect to system shutdown signal or v in ? buck mode: connect to system shutdown signal or v in ? buck-boost mode: if pwm dimming, connect to pwm (pin 6); if no pwm dimming, connect to system shut- down signal or v in v in quiescent current vs i led v in shutdown current vs v in i led (ma) 50 35 30 25 20 15 10 5 0 200 300 3003 g07 100 150 250 350 v in quiescent current (ma) v in (v) 3 v in shutdown current ( a) 8 12 3003 g08 4 0 13 23 33 8 18 28 38 16 6 10 2 14 shdn = 0 t a = 25c unless otherwise noted.
lt3003 5 3003fa block diagram figure 1. block diagram 1 2 ? + ? + ? + 4 v ee b1 b2 b3 led1 pwm 0.5v v max led2 11 exposed pad led3 3 v in 3v 5 v ee shdn 0.7v 9 ot1 7 pwm logic thermal shutdown bias bg bg 125 c 150 c ot2 3003 f01 8 6 ? + 10 ? + b2 b1 v in b3 v ee (pin 10): lower rail. ? boost: connect to system ground ? buck mode: connect to inductor ? buck-boost mode: connect to input supply exposed pad (pin 11): gnd. the ground for the ic should be soldered to a continuous copper ground plane under the lt3003 die. soldering the exposed pad to the copper ground plane under the device will reduce thermal resis- tance and increase the power capability of the lt3003. pin functions
lt3003 6 3003fa the lt3003 is an easy-to-use 3-channel led ballaster. it allows three strings of leds to be driven in parallel with accurate led current matching. a pwm pin is also provided allowing led currents to be turned on and off at very low duty cycles for very wide led dimming ranges. for reliable system thermal management, two output ? ags, ot1 and ot2, are provided to indicate when the junction temperature exceeds 125c. the block diagram in figure 1 best illustrates the features of lt3003. the lt3003 internal bias circuitry is turned on when v in > 3v and shdn > 0.7v. for led current to be active in each channel, the pwm pin must exceed 0.5v. v max should be connected to the highest supply in the application (see various application modes of boost, buck, buck-boost in the typical applications section). the lt3003 ballasting feature is achieved by using the current monitored in the led2 channel to control the current in channels led1 and led3. a servo loop exists for each channel led1 and led3 that compares the cur- rent in each channel to the led2 reference channel. the current in led2 channel is determined by the led current programmed by the partner led driver. details of how led current can be programmed by the partner ic are covered in the typical applications section using various ics as led drivers. maximum fault current in each of the lt3003 led pins is internally limited to 550ma. if any led string experiences an open-circuit fault, all led string currents are turned off. the lt3003 pwm pin has unique level-shifting circuitry to allow a simple logic-level pwm signal to turn each led pin current on and off regardless of the v ee pin voltage. this allows very simple pwm dimming control of led current without any need for external level-shifting components in buck mode and buck-boost mode applications. care is taken to ensure low current (nano amps) in the v ee and v max pins 10s after pwm low edge. this feature mini- mizes leakage currents in each application to maximize pwm dimming ratio. details of pwm dimming and criti- cal parameters are given in the applications information section pwm dimming. the lt3003 incorporates internal junction temperature sensing and provides two open-collector outputs, ot1 and ot2, which become active low when junction tem- perature exceeds 125c. ot1 is sized to pull 100a and can be used as an input to the microprocessor for system thermal management. ot2 is sized to pull 300a to defeat switching for most of ltcs led drivers by pulling down the g m error ampli? er output. lt3003 is forced to a zero led current state by a special internal protection circuit when junction temperature reaches 150c. to calculate the lt3003 junction temperature, see thermal calculations in the applications information section. operation
lt3003 7 3003fa input capacitor selection the lt3003 is typically driven from the same input voltage used for the partner led driver ic. the led driver and inductor govern the requirements for the input capacitor of the application. a ceramic input capacitor in the range of 1f to 10f works for most applications. in cases where the lt3003 input voltage is derived separately from the led driver, a 1f input capacitor works well. led current matching an led driver programs the led current and lt3003 ac- tively ballasts three separate strings of leds. the currents in all three channels will be matched to better than 3%. to achieve best current matching, (v in C v ee ) should be between 3v and 10v. a low (v in C v ee ) also minimizes lt3003 internal power dissipation (see thermal calcula- tion section for more information). pwm dimming the lt3003 has a wide pwm dimming range for constant color led dimming. pwm dimming is superior to analog dimming as it preserves true color quality. pwm dimming control with the lt3003 is achieved using a simple ground referenced pwm signal with a 0.5v on/off threshold. the leds operate at either programmed or zero current but their brightness changes with the pwm signal duty cycle. when pwm is low, led strings are completely discon- nected. in addition, the lt3003 switches to low power standby mode ~10s after pwm low edge, resulting in higher system power ef? ciency. for the widest dimming range, the pwm signal should be 100hz. the human eye is typically sensitive to ? ickering below ~80hz. operating the pwm higher than 100hz results in a reduced pwm dimming ratio. achieving high pwm dimming ratios require attention to circuit leakages, such as reverse bias leakage currents through the external schottky. hence, for high pwm dim- ming ratios, components should be chosen to minimize leakage currents. if an application does not require pwm dimming, the pwm pin can be left open (unconnected) and an internal 10a source current pulls pwm high. boost pwm dimming the lt3003 supports up to a 3000:1 pwm dimming ratio with a 100hz pwm dimming frequency. to achieve such high pwm ratios, leakages of the led driver and other external components should be minimal. buck mode: pwm dimming the lt3003 supports up to a 3000:1 pwm dimming ratio in buck mode. the pwm dimming in buck mode is achieved by an architecture that allows the lt3003 power ground (v ee ) to move with output capacitor voltage. pwm dim- ming control is achieved by a simple ground referenced pwm signal, eliminating the need for any external level- shift component. high pwm dimming ratios require very low v ee and v max pin currents during the pwm off state. the lt3003 v in ? v ee (v) 3 i led1,3 vs i led2 (%) 8 12 3003 f02 2 69 0 10 6 4 36 33 30 27 24 21 18 15 i led2 = 350ma ? v led = 1.4v figure 2. i led matching vs (v in C v ee ) led pin current range the steady-state operational current range for each led pin is between 100ma and 350ma. internal protection circuitry limits absolute maximum pin current to 550ma. led open-circuit protection if any led string is open, then currents in all three chan- nels reduce to zero. the driver chip, which supplies led current, should have an overvoltage clamp to protect the lt3003 from high led pin voltages. applications information
lt3003 8 3003fa uses novel circuit techniques to reduce v ee and v max pin currents to nano amp range ~10s after pwm low edge. this preserves the output capacitor voltage and results in higher pwm dimming ratios. buck-boost mode: pwm dimming the lt3003 can also perform pwm dimming in buck-boost mode. the buck-boost con? guration requires the pwm and shdn pins to be tied together. this con? guration can support up to a 2000:1 pwm dimming ratio. drv led driver sw pwm l1 d1 c1 c2 v in r sense d1a d2a d3a d1b d2b d3b d1c d2c d3c + led1 pwm shdn v in ot1 ot2 led2 lt3003 led3 v ee gnd 3003 f03 v max ea figure 3. boost mode drv led driver sw c1 c2 d1 v in r sense d1a d2a d3a d1b d2b d3b d1c d2c d3c + led1 pwm l1 pwm ot1 ot2 shdn led2 lt3003 led3 v ee gnd 3003 f04 v in v max ea figure 4. buck mode c1 c2 d3c d3b d3a 3003 f05 led3 d2c d2b d2a led2 gnd v ee v in d1c d1b d1a led1 ot1 ot2 shdn pwm pwm v in v max lt3003 drv led driver sw + ea l1 d1 r sense figure 5. buck-boost mode overtemperature protection the lt3003 incorporates internal junction temperature sensing and provides two open-collector outputs, ot1 and ot2, which become active low when junction temperature exceeds 125c. the active ot1 output can sink 100a of current and can be connected to system microprocessor. the active low ot2 output can sink 300a of current and can be connected to the switching regulators g m error ampli? er output to defeat switching. the lt3003 has to cool down by 6c (119c) for ot1 and ot2 outputs to reset (collector outputs high). applications information
lt3003 9 3003fa in addition, lt3003 has an internal 150c overtemperature protection circuitry that resets the chip to zero led current mode. this prevents the chip from continuous operation at high temperature. thermal calculations to maximize output power capability in an application without exceeding the lt3003 125c maximum operational junction temperature, it is useful to be able to calculate power dissipation within the ic. the power dissipation within the lt3003 comes from four main sources: switch dc loss, switch loss due to led v led mismatch and input quiescent current. 1. switch dc loss: p sw(dc) = i led ? v led ? 3 (see (v led1,2,3 C v ee ) vs i led typical performance characteristics graph.) 2. switch loss due to v led mismatch: p sw( vled) = total v led mismatch ? i led 3. input quiescent loss: p q = (v in C v ee ) ? (i q C 1ma) + 1ma ? v in i i ma q led =+ 3 40 3 4. total power dissipation: p tot = p sw(dc) + p sw( vled) + p q 5. lt3003 junction temperature: t j (lt3003) = t a + ja (p tot ); ja (p tot ) = p tot ? 35c/w example v in = 3v; v ee = 0v; i led = 350ma/string; ? i ma ma ma q =+= 3 350 40 32925 . total v led mismatch = 1v: ? e.g., led string 1 voltage drop = 6v; led string 2 voltage drop = 5.7v; led string 3 voltage drop = 5.3v ? total v led mismatch = (6v C 5.7v) + (6v C 5.3v) = 1v v led = 1.1v at i led = 350ma (see (v led C v ee ) vs i led typical performance characteristics graph). 1. p sw(dc) = 3 ? 350ma ? (1.1v) = 1.16w 2. p sw(led) = 1000mv ? 350ma = 350mw 3. p q = (3 C 0) ? (29.25 C 1)ma + 3 ? 1ma = 88mw 4. p tot = 1.1w + 350mw + 88mw 1.6w the lt3003 uses a thermally enhanced 10-lead mse package. with proper soldering of the exposed pad to the underside of the package, combined with a full copper plane underneath the device, the thermal resistance ( ja ) is about 35c/w. for an ambient temperature of t a = 25c, the junction temperature of the lt3003, for the example application described above, can be calculated as: 5. t j = t a + ja ? p tot = 25c + 35c/w ? 1.6w = 81c minimizing lt3003 internal power dissipation the lt3003 requires at least 3v headroom between v in and v ee . hence, for systems with high system input volt- age and low v ee (such as running multiple series leds in a buck mode), it is bene? cial to lower the level of v in pin voltage (lt3003 upper rail) with an external zener to reduce power dissipation in the chip. therefore, it is recom- mended to limit (v in C v ee ) to less than 10v. to achieve best performance, (v in C v ee ) should equal 3v. applications information
lt3003 10 3003fa 1.05a buck mode lt3003 with the lt3476 led led led led r1 0.1 ? led led 1 2 9 54 10 c2 0.33 f 1nf c1 1 f r3 21k 4.7 f 35v 1 f pv in 32v v in 3v to 16v l1 10 h d1 d2 20v 3 6 3003 ta02a ot1 7 ot2 lt3003 v in v max 8 gnd 11 led1 led2 led3 8 leds per string; 350ma per string c1: tdk c1608x7r1c105k c2: taiyo yuden gmk212bj334mg-t d1: diodes inc. dfls140 l1: toko a916cy-100m-p3 led: lumileds luxeon shdn v ee pwm cap1 v in shdn lt3476 gnd nc 3 18 33 2 7 37 6 led1 ref v adj1 35 pwm1 29 sw1 r t 28 39 sw1 1 v c1 19-21, 30-32 total led current (ma) 0 60 efficiency (%) 65 70 75 80 90 200 400 600 800 3003 ta02b 1000 1200 85 pv in = 33v number of leds = 8 3 = 24 ef? ciency typical applications
lt3003 11 3003fa 330ma boost lt3003 with the lt3477 lt3003 v in v in c3 1 f 25v 3003 ta03a i led 110ma per string 6 to 8 leds per string 4 5 9 11 10 v max pwm 8 7 6 6 13 14 16 17 d1 11 321 v out 4v led1 led2 led3 v ee gnd shdn ot1 ot2 fbn i sp2 3 7 8 5 12 2 4 21 15 pwm r3 6.81k i sn2 fbp v ref r t v c d2 1n4148w shdn lt3477 i sp1 i sn1 sw sw gnd gnd ss nc nc nc 1 10 9 v in i adj1 i adj2 18 19 20 r4 0.3 ? 1% r5 1.15m 1% l1 4.7 h v in 8v to 16v r6 45.3k 1% c3 0.033 f c4 4.7 f 50v v out c2 22nf c1, c3: taiyo yuden tmk212bj105mg-br c4: murata grm32er71h475ka88l d1: diodes inc. dfls140 l1: sumida cdrh5d16-4r7 q1 2n7002 c1 1 f 25v pwm dimming ratio 1 total i led (ma) 10 100 10000 3003 ta03b 1 0.1 10 100 1000 1000 i led = 110ma per string number of leds = 8 3 = 24 v in (v) 8 50 efficiency (%) 55 65 70 75 100 85 10 12 13 3003 ta03b 60 90 95 80 911 14 15 16 i led = 110ma per string number of leds = 8 3 = 24 pwm dimming ef? ciency typical applications
lt3003 12 3003fa 300ma buck-boost mode lt3003 with the lt3477 lt3003 v in 1 2 3 6 97 8 v max pwm 7 6 d1 45 d3 led1 led1 led2 led3 v ee gnd shdn ot1 ot2 led2 led3 i led = 100ma led4 led5 led6 led7 led8 led9 led10 led11 led12 fbn shdn ss v c lt3477 i sp1 i sn1 sw gnd fbp v ref i sp2 i sn2 r t v in i adj1 i adj2 10 h r sense 0.33 ? 3.3 f 50v cer d1: zetex zlls1000 d2: diodes inc 1n4148 d3: philips pdz9.1b nmos: zetex 2n7002 nmos d2 pwm 3003 ta04a 280k 10k 10nf 33nf cer v in 8v to 16v 33 f cer 1 f 0v 5v 100hz 6.81k ef? ciency v in (v) 6 68 efficiency (%) 70 72 74 76 80 8 10 12 14 3003 ta04b 16 18 78 i led = 200ma i led = 100ma number of leds = 4 3 = 12 typical applications
lt3003 13 3003fa 1a buck mode lt3003 with the lt1618 ef? ciency lt3003 led2 led3 led1 d1 14v r1 1m v in 5v c3 1 f 50v l1 10 h 1.5a pwm 100hz, 5v 500:1 max pwm dimming ratio c out 1 f 50v cer 220pf gnd pwm v max i led = 333ma per string v ee v in shdn ot1 ot2 c1 4.7 f 50v cer 10nf 3003 ta05a 1k 1n4148w zlls1000 r sense 0.05 ? 1%, 1a isn lt1618 isp v in shdn sw q4 2n7002 v c i adj gnd fb nc 1 f 10v cer v in 32v total led current (a) 0 77 efficiency (%) 78 79 80 81 82 83 0.2 0.4 0.6 0.8 3003 ta05b 1.0 number of leds = 6 3 = 18 typical applications
lt3003 14 3003fa 1a buck lt3003 with the lt3475 ef? ciency lt3003 gnd 20v led1 led2 led3 v max v in v ee shdn ot2 ot1 pwm pwm1 100hz 2000:1 max pwm dimming ratio led1 led4 led7 led2 330ma per string 3s 3p luxeon i white led5 led8 led3 led6 led9 c3 1 f 50v v in 56 16 11 20 8 10 7 3 1 4 r1 20k v in shdn pwm1 pwm2 boost1 out1 17 ref sw1 led1 d1 1n4448w d2 b240a c1 0.22 f x5r r4 1.0k l1 10 h sumida boost2 out2 sw2 9 2 gnd gnd r t lt3475 led2 second channel one of two channels shown r8 2.0k 12 19 v adj1 v adj2 r10 10k r12 11.8k 1% r13 1.0m c7 220pf q3 2n7002 c5 0.1 f c3 3300pf c out1 2.2 f 16v c in1 4.7 f 50v 13 15 14 21 f sw = 1mhz 3003 ta06a 18 v c1 v c2 v in 24v total led current (a) 0 50 efficiency (%) 65 70 80 0.2 0.4 0.6 0.8 3003 ta06b 1.0 90 100 55 65 75 85 95 1.2 typical applications
lt3003 15 3003fa information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. mse package 10-lead plastic msop (reference ltc dwg # 05-08-1664) msop (mse) 0603 0.53 0.152 (.021 .006) seating plane 0.18 (.007) 1.10 (.043) max 0.17 ? 0.27 (.007 ? .011) typ 0.86 (.034) ref 0.50 (.0197) bsc 12 3 45 4.90 0.152 (.193 .006) 0.497 0.076 (.0196 .003) ref 8 9 10 10 1 7 6 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.254 (.010) 0 ? 6 typ detail ?a? detail ?a? gauge plane 5.23 (.206) min 3.20 ? 3.45 (.126 ? .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.305 0.038 (.0120 .0015) typ 2.083 0.102 (.082 .004) 2.794 0.102 (.110 .004) 0.50 (.0197) bsc bottom view of exposed pad option 1.83 0.102 (.072 .004) 2.06 0.102 (.081 .004) 0.127 0.076 (.005 .003) package description
lt3003 16 3003fa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2006 lt 0107 rev a ? printed in usa part number description comments lt1618 constant-current/constant-voltage dc/dc converter drives 20 white leds from li-ion, 10-lead ms package lt1932 constant current,1.2mhz, high ef? ciency white led boost regulator v in : 1v to 10v, v out(max) = 34v, i q = 1.2ma, i sd < 1a, thinsot tm package lt1942 quad dc/dc converter for triple output tft supply plus boost led driver, with a 2-channel ballaster tft supply: three switching regulators (two boost, one inverting) led supply: up to two strings of 10 leds. v in : 2.6v to 16v, v out(max) = 45v, i q = 7ma, i sd < 1a, low pro? le qfn package. lt3475 36v, 2mhz, dual 1.5a step-down led driver v in : 4v to 36v, 200khz to 2mhz, tssop20e package, 3000:1 dimming lt3477 3a, 3.5mhz, constant-current dc/dc converter with dual rail sense. can drive leds in boost, buck and buck-boost con? gurations v in : 2.5v to 25v, v out(max) = 42v, i sd < 1a, qfn/tssop packages lt3478 4.5a constant current boost led driver with pwm v in : 2.7v to 36v, v out(max) = 40v, i led(max) = 1.05a, i sd < 5a, fe16 package lt3479 3a, 3.5mhz, 42v full featured boost/inverter converter with soft-start v in : 2.5v to 24v, v out(max) = 40v, i q = 5ma, i sd < 1a, dfn/tssop packages lt3474 36v, 2mhz, step-down 1a led driver v in : 4v to 36v, 200khz to 2mhz, tssop16e package, 400:1 dimming ltc3205 multi-display led controller, step-up/step-down fractional charge pump, independent current and dimming control v in : 2.8v to 4.5v, 800mhz, qfn package ltc3783 pwm led power and boost, flyback and sepic controller v in : 3.6v to 36v, 300khz, dfn, tssop16e package, 3000:1 dimming thinsot is a trademark of linear technology corporation. related parts

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