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lt3591 1 3591f cellular phones pdas, handheld computers digital cameras mp3 players gps receivers typical application features applications description white led driver with integrated schottky in 3mm 2mm dfn the lt ? 3591 is a ? xed frequency step-up dc/dc converter speci? cally designed to drive up to ten white leds in series from a li-ion cell. series connection of the leds provides identical led currents resulting in uniform brightness and eliminating the need for ballast resistors. the device features a unique high side led current sense that enables the part to function as a one wire current source; one side of the led string can be returned to ground anywhere, allowing a simpler one wire led connection. traditional led drivers use a grounded resistor to sense led current, requiring a 2-wire connection to the led string. the high switching frequency allows the use of tiny induc- tors and capacitors. a single pin performs both shutdown and accurate led dimming control. few external compo- nents are needed: open-led protection and the schottky diode are all contained inside a low pro? le 3mm 2mm dfn package. li-ion driver for ten white leds drives up to ten white leds from a 3v supply high side sense allows one wire current source internal schottky diode one pin dimming and shutdown 80:1 true color pwm tm dimming range 42v open led protection 1mhz switching frequency 5% reference accuracy v in range: 2.5v to 12v requires only 2.2f output capacitor low pro? le 8-lead dfn package (3mm 2mm 0.75mm) conversion ef? ciency ctrl v in 22 h v in 3v to 5v r sense 10 ? 3591 ta01a lt3591 shutdown and dimming control sw cap led gnd 2.2 f 1 f led current (ma) 0 efficiency (%) 60 20 3591 ta01b 5 10 15 80 70 55 65 75 v in = 3.6v 10 leds , lt, ltc and ltm are registered trademarks of linear technology corporation. true color pwm is a trademark of linear technology corporation. all other trademarks are the property of their respective owners.
lt3591 2 3591f package/order information electrical characteristics absolute maximum ratings input voltage (v in ) ................................................... 12v ctrl voltage ........................................................... 12v sw voltage .............................................................. 45v cap voltage ............................................................. 45v led voltage ............................................................. 45v operating junction temperature range (note 2) ...............................................C 40c to 85c maximum junction temperature ........................ 125c storage temperature range ...................C 65c to 150c (note 1) 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. parameter conditions min typ max units minimum operating voltage 2.5 v led current sense voltage (v cap C v led )v cap = 24v, i sw = 300ma 190 200 210 mv cap pin bias current v cap = 36v, v led = 35.8v 40 80 a led pin bias current v cap = 36v, v led = 35.8v 20 40 a supply current v cap = 24v, v led = 23v ctrl = 0v 4 9 5 11 ma a switching frequency 0.75 1 1.2 mhz maximum duty cycle 92 94 % switch current limit 500 800 ma switch v cesat i sw = 300ma 200 mv switch leakage current v sw = 24v 0.1 5 a v ctrl for full led current v cap = 44v 1.5 v v ctrl to shut down ic 50 mv v ctrl to turn on ic 100 mv ctrl pin bias current 100 na cap pin overvoltage protection 40 42 44 v schottky forward drop i schottky = 200ma 0.8 v schottky leakage current v r = 30v 4 a top view 9 ddb package 8-lead (3mm 2mm) plastic dfn 5 6 7 8 4 3 2 1 v in gnd nc sw ctrl led nc cap t jmax = 125c, ja = 76c/w exposed pad (pin 9) should be connected to pcb ground order part number ddb part marking lt3591eddb lcpg 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. the denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. v in = 3v, v ctrl = 3v, unless otherwise speci? ed. note 2: the lt3591e is guaranteed to meet performance speci? cations from 0c to 85c operating junction temperature range. speci? cations over the C40c to 85c operating junction temperature range are assured by design, characterization and correlation with statistical process controls.
lt3591 3 3591f typical performance characteristics switch saturation voltage (v cesat ) schottky forward voltage drop shutdown current (v ctrl = 0v) sense voltage (v cap C v led ) vs v ctrl open-circuit output clamp voltage input current in output open circuit switching waveform transient response switch current (ma) 0 500 400 300 200 100 0 300 600 3591 g01 100 200 400 800 700 500 switch saturation voltage (mv) C50 c 125 c 25 c schottky forward drop (mv) schottky forward current (ma) 200 300 3591 g02 100 0 600 500 400 0 200 400 600 800 1000 1200 C50 c 125 c 25 c v in (v) 0 shutdown current ( a) 9 12 15 12 3591 g03 6 3 0 3 6 9 C50 c 125 c 25 c v ctrl (mv) sense voltage (mv) 80 120 3591 g04 40 0 240 200 160 0 500 1000 1500 2000 2500 3000 C50 c 25 c 125 c v in (v) 0 output clamp voltage (v) 42 43 12 3591 g05 41 40 3 6 9 45 44 C50 c 125 c 25 c v in (v) 0 input current (ma) 36 912 3591 g06 C50 c 125 c 4 5 6 3 2 0 1 8 7 25 c v sw 20v/div v cap 50mv/div i l 200ma/div v in = 3.6v front page application circuit 500ms/div 3591 g07 v ctrl 5v/div v cap 5v/div i l 500ma/div v in = 3.6v front page application circuit 1ms/div 3591 g08 t a = 25c, unless otherwise speci? ed.
lt3591 4 3591f v in (v) 0 0 quiescent current (ma) 1 2 3 4 5 6 36 912 3591 g09 C50 c 125 c 25 c temperature ( c ) 0 current limit (ma) 400 1000 3591 g10 200 600 800 C50 C25 0 25 50 75 100 125 C50 25 75 C25 0 50 100 125 temperature ( c) 0 schottky leakage current ( a) 3 6 9 12 15 3591 g11 v r = 10v v r = 16v v r = 20v temperature ( c) C50 C25 40 output clamp voltage (v) 42 45 0 50 75 3591 g12 41 44 43 25 100 125 temperature ( c) C50 input current (ma) 25 75 3591 g13 C25 0 50 100 125 v in = 3v 4 5 6 3 2 0 1 8 7 temperature ( c) C50 switching frequency (khz) 25 75 3591 g14 C25 0 50 100 125 1000 1050 1100 950 900 750 800 850 1200 1150 temperature ( c) C50 maximum duty cycle (%) 25 75 3591 g15 C25 0 50 100 125 98 96 94 90 92 100 v cap (v) 5 sense voltage (mv) 20 30 3591 g16 10 15 25 35 204 200 196 188 192 208 C50 c 125 c 25 c temperature ( c) C50 C25 188 sense voltage (mv) 196 208 0 50 75 3591 g17 192 204 200 25 100 125 typical performance characteristics quiescent current (v ctrl = 3v) current limit vs temperature schottky leakage current vs temperature open-circuit output clamp voltage vs temperature input current in output open circuit vs temperature switching frequency vs temperature maximum duty cycle vs temperature sense voltage (v cap C v led ) vs v cap sense voltage (v cap C v led ) vs temperature t a = 25c, unless otherwise speci? ed.
lt3591 5 3591f block diagram pin functions v in (pin 1): input supply pin. must be locally bypassed. gnd (pin 2): ground pin. should be tied directly to local ground plane. sw (pin 4): switch pin. minimize trace area at this pin to minimize emi. connect the inductor at this pin. cap (pin 5): output of the driver. this pin is connected to the cathode of internal schottky. connect the output capacitor to this pin and the sense resistor from this pin to the led pin. led (pin 7): connection point for the anode of the first led and the sense resistor. the led current can be programmed by : i mv r led sense = 200 ctrl (pin 8): dimming and shutdown pin. connect this pin below 50mv to disable the driver. as the pin voltage is ramped from 0v to 1.5v, the led current ramps from 0 to i led ( = 200mv/r sense ). the ctrl pin must not be left ? oating. exposed pad (pin 9): ground. the exposed pad must be soldered to pcb ground to achieve the rated thermal performance. 4 C + C + r sw cap 1 v in q s driver overvoltage protection ramp generator oscillator v ref 1.25v start-up control shdn q1 r C + + 5 led 3591 f01 ctrl gnd 7 82 C + a = 6.25 a1 r c c c a2 a3 pwm comp figure 1. block diagram
lt3591 6 3591f figure 2. switching waveforms operation the lt3591 uses a constant frequency, current mode control scheme to provide excellent line and load regula- tion. operation can be best understood by referring to the block diagram in figure 1. at power-up, the capacitor at the cap pin is charged up to v in (input supply voltage) through the inductor and the internal schottky diode. if ctrl is pulled higher than 100mv, the bandgap reference, the start-up bias and the oscillator are turned on. at the start of each oscillator cycle, the power switch q1 is turned on. a voltage proportional to the switch current is added to a stabilizing ramp and the resulting sum is fed into the positive terminal of the pwm comparator, a2. when this voltage exceeds the level at the negative input of a2, the pwm logic turns off the power switch. the level at the negative input of a2 is set by the error ampli? er a1, and is simply an ampli? ed version of the difference between the v cap and v led voltage and the bandgap reference. in this manner the error ampli? er, a1, sets the correct peak current level in inductor l1 to keep the output in regulation. the ctrl pin is used to adjust the led current. the lt3591 enters into shutdown when ctrl is pulled lower than 50mv. minimum output current the lt3591 can drive a 2-led string at 2ma led current without pulse skipping using the same external compo- nents shown in the application circuit on the front page of this data sheet. as current is further reduced, the device will begin skipping pulses. this will result in some low frequency ripple, although the average led current remains regulated down to zero. the photo in figure 2 details circuit operation driving two white leds at 2ma load. peak induc- tor current is less than 40ma and the regulator operates in discontinuous mode, meaning the inductor current reaches zero during the discharge phase. after the inductor current reaches zero, the sw pin exhibits ringing due to the lc tank circuit formed by the inductor in combination with the switch and the diode capacitance. this ringing is not harmful; far less spectral energy is contained in the ringing than in the switch transitions. v sw 5v/div i l 20ma/div v in = 4.2v i led = 2ma 2 leds 500ns/div 3591 f02
lt3591 7 3591f inductor selection a 22h inductor is recommended for most lt3591 ap- plications. although small size and high ef? ciency are major concerns, the inductor should have low core losses at 1mhz and low dcr (copper wire resistance). some small inductors in this category are listed in table 1. the ef? ciency comparison of different inductors is shown in figure 3. table 1. recommended inductors part l (h) current rating (ma) max dimension l w h (mm) vendor vlf4012at- 220mr51 22 510 4 3.8 1.2 tdk www.tdk.com vlcf4018t- 220mr49-2 22 490 4.1 4.1 1.8 vlcf4020t- 220mr56 22 560 4.1 4.1 2 lqh43cn220k03 22 420 4.8 3.4 2.8 murata www.murata.com nr4018t220m 22 590 4.2 4.2 1.8 taiyo yuden www.t-yuden.com nr4012t220m 22 510 4.2 4.2 1.2 cdrh3d18- 220nc 22 600 4 4 2 sumida www.sumida.com b82470-a1223-m 22 480 4.8 4.8 1.2 epcos www.epcos.com applications information capacitor selection the small size of ceramic capacitors make them ideal for lt3591 applications. use only x5r and x7r types because they retain their capacitance over wider temperature ranges than other types such as y5v or z5u. a 1f input capacitor and a 50v, 2.2f output capacitor are suf? cient for most applications. a limited number of manufacturers produce small 50v capacitors. table 2 shows a list of several recommended 50v capacitors. consult the manufacturer for detailed information on their entire selection of ceramic parts. table 2. recommended output capacitors part c (f) voltage case size vendor temp. height (mm) grm21br71h105 ka12l 1 50v 0805 murata www.murata.com x7r 1.25 0.15 grm31mr71h105ka88 1 50v 1206 x7r 1.15 0.1 grm31cr71h225ka88 2.2 50v 1206 x7r 1.6 0.2 grm31cr71h475ka12l 4.7 50v 1206 x7r 1.6 0.2 umk316bj475kl-t 4.7 50v 1206 taiyo yuden www.t-yuden.com x7r 1.6 0.2 figure 3. ef? ciency comparison of different inductors led current (ma) 0 50 efficiency (%) 55 85 80 65 5 10 3591 f03 70 75 60 15 20 taiyo yuden nr4018t220m tdk vlcf4018t-220mr49-2 taiyo yuden nr4012t220m tdkvlcf4012at-220mr51 murata lqh43cn220k03 tdk vlcf4020t-220mr56 sumida cdrh3d18-220nc epcos b82470-a1223-m v in = 3.6v 10 leds
lt3591 8 3591f applications information schottky diode the lt3591 has a built-in schottky diode. the internal schottky saves board space in space constrained appli- cations. in less space sensitive applications, an external schottky diode connected between the sw node and the cap node increases ef? ciency one to two percent. it is important to use a properly rated schottky diode that can handle the peak switch current of the lt3591. in addition, the schottky diode must have a breakdown voltage of at least 40v along with a low forward voltage in order to achieve higher ef? ciency. one recommended external schottky diode for the lt3591 is the phillips pmeg4005aea. overvoltage protection the lt3591 has an internal open-circuit protection circuit. in the cases of output open circuit, when the leds are disconnected from the circuit or the leds fail open circuit, v cap is clamped at 42v (typ). the lt3591 will then switch at a very low frequency to minimize input current. the v cap and input current during output open circuit are shown in the typical performance characteristics. figure 4 shows the transient response when the leds are disconnected. for low dcr inductors, which is usually the case for this application, the peak inrush current can be simpli? ed as follows: i v l r l lc pk in = ? ? ? ? ? ? = = C. ? ? exp C ? ? ? C 06 2 2 1 rr l 2 2 4? where l is the inductance, r is the dcr of the inductor and c is the output capacitance. table 3 gives inrush peak currents for some component selections. table 3. inrush peak currents v in (v) r ( )l ( h) c out ( f) i p (a) 4.2 0.3 22 2.2 1.06 4.2 0.71 22 2.2 0.96 4.2 0.58 15 1 0.83 4.2 1.6 15 1 0.68 programming led current the feedback resistor (r sense ) and the sense voltage (v cap C v led ) control the led current. the ctrl pin controls the sense reference voltage as shown in the typical performance characteristics. for ctrl higher than 1.5v, the sense reference is 200mv, which results in full led current. in order to have accurate led current, precision resistors are preferred (1% is rec- ommended). the formula and table for r sense selection are shown below. r mv i sense led = 200 v cap 20v/div i l 500ma/div v in = 3.6v circuit of front page application leds disconnected at this instant 500 s/div 3591 f04 figure 4. output open-circuit waveform inrush current the lt3591 has a built-in schottky diode. when supply voltage is applied to the v in pin, an inrush current ? ows through the inductor and the schottky diode and charges up the cap voltage. the schottky diode inside the lt3591 can sustain a maximum current of 1a.
lt3591 9 3591f applications information table 4. r sense value selection for 200mv sense i led (ma) r sense ( ) 540 10 20 15 13.3 20 10 dimming control there are three different types of dimming control circuits. the led current can be set by modulating the ctrl pin with a dc voltage, a ? ltered pwm signal or directly with a pwm signal. using a dc voltage for some applications, the preferred method of brightness control is a variable dc voltage to adjust the led current. the ctrl pin voltage can be modulated to set the dim- ming of the led string. as the voltage on the ctrl pin increases from 0v to 1.5v, the led current increases from 0 to i led . as the ctrl pin voltage increases beyond 1.5v, it has no effect on the led current. the led current can be set by: i mv r when v v i v led sense ctrl led ctrl > 200 15 6 ,. . 2 25 125 ? ,. r when v v sense ctrl < feedback voltage variation versus control voltage is given in the typical performance characteristics. using a filtered pwm signal a ? ltered pwm signal can be used to control the brightness of the led string. the pwm signal is ? ltered (figure 5) by a rc network and fed to the ctrl pin. the corner frequency of r1, c1 should be much lower than the frequency of the pwm signal. r1 needs to be much smaller than the internal impedance of the ctrl pin which is 10m (typ). direct pwm dimming changing the forward current ? owing in the leds not only changes the intensity of the leds, it also changes the color. the chromaticity of the leds changes with the change in forward current. many applications cannot tolerate any shift in the color of the leds. controlling the intensity of the leds with a direct pwm signal allows dimming of the leds without changing the color. in addition, direct pwm dimming offers a wider dimming range to the user. dimming the leds via a pwm signal essentially involves turning the leds on and off at the pwm frequency. the typical human eye has a limit of ~60 frames per second. by increasing the pwm frequency to ~80hz or higher, the eye will interpret that the pulsed light source is con- tinuously on. additionally, by modulating the duty cycle (amount of on-time), the intensity of the leds can be controlled. the color of the leds remains unchanged in this scheme since the led current value is either zero or a constant value. figure 6 shows a li-ion powered driver for ten white leds. direct pwm dimming method requires an external nmos tied between the cathode of the lowest led in the string lt3591 ctrl c1 0.1 f pwm 10khz typ 3591 f05 r1 100k figure 5. dimming control using a filtered pwm signal ctrl pwm freq v in l1 22 h v in 3v to 5v r sense 10 ? 3591 f06 lt3591 sw cap led 100k gnd 0v 5v c2 2.2 f q1 si2308 c1 1 f figure 6. li-ion to ten white leds with direct pwm dimming
lt3591 10 3591f and ground as shown in figure 6. a si2308 mosfet can be used since its source is connected to ground. the pwm signal is applied to the ctrl pin of the lt3591 and the gate of the mosfet. the pwm signal should traverse between 0v to 5v, to ensure proper turn on and off of the driver and the nmos transistor q1. when the pwm signal goes high, the leds are connected to ground and a current of i led = 200mv/r sense ? ows through the leds. when the pwm signal goes low, the leds are disconnected and turn off. the mosfet ensures that the leds quickly turn off without discharging the output capacitor which in turn allows the leds to turn on faster. figure 7 shows the pwm dimming waveforms for the circuit in figure 6. applications information the calculations show that for a 100hz signal the dimming range is 83 to 1. in addition, the minimum pwm duty cycle of 1.2% ensures that the led current has enough time to settle to its ? nal value. figure 8 shows the dimming range achievable for different frequencies with a settling time of 120s. i l 500ma/div i led 20ma/div pwm 5v/div v in = 3.6v 10 leds 2ms/div 3591 f07 figure 7. direct pwm dimming waveforms the time it takes for the led current to reach its pro- grammed value sets the achievable dimming range for a given pwm frequency. for example, the settling time of the led current in figure 7 is approximately 120s for a 3.6v input voltage. the achievable dimming range for this application and 100hz pwm frequency can be determined using the following method. example: ? ? == == = 100 120 11 100 001 hz t s ts settle period , . ddim range t t s s mi period settle . : === 001 120 83 1 n n duty cycle t t s s settle period ? . == 100 120 001 ? ?.% %.% 100 1 2 100 1 2 100 = = duty cycle range at h hz pwm dimming frequency (hz) 10 pwm dimming range 100 1000 10000 100 1000 10000 3591 f08 1 10 pulsing may be visible figure 8. dimming range vs frequency in addition to extending the dimming range, pwm dimming improves the ef? ciency of the converter for led currents below 20ma. figure 9 shows the ef? ciency for traditional analog dimming of the front page application and pwm dimming of the application in figure 6. figure 9. pwm vs analog dimming ef? ciency led current (ma) 0 efficiency (%) 60 65 70 20 3591 f09 55 5 10 15 80 75 pwm dimming analog dimming v in = 3.6v 10 leds
lt3591 11 3591f applications information low input voltage applications the lt3591 can be used in low input voltage applications. the input supply voltage to the lt3591 must be 2.5v or higher. however, the inductor can be run off a lower battery voltage. this technique allows the leds to be powered off two alkaline cells. most portable devices have a 3.3v logic supply voltage which can be used to power the lt3591. the leds can be driven straight from the battery, resulting in higher ef? ciency. figure 10 shows six leds powered by two aa cells. the battery is connected to the inductor and the chip is powered off a 3.3v logic supply voltage. ctrl v in c2 4.7 f c1: taiyo yuden emk107bj105ma c2: murata grm31cr71h475ka12l l1: taiyo yuden nr4018t150m c1 1 f l1 15 h c1 1 f 2 aa cells 2v to 3.2v 3.3v r sense 10 ? 3591 f10 lt3591 shutdown and dimming control sw cap led gnd figure 10. 2 aa cells to six white leds board layout considerations as with all switching regulators, careful attention must be paid to the pcb board layout and component placement. to prevent electromagnetic interference (emi) problems, proper layout of high frequency switching paths is essential. minimize the length and area of all traces connected to the switching node pin (sw). keep the sense voltage pins (cap and led) away from the switching node. place c out next to the cap pin. always use a ground plane under the switching regulator to minimize interplane coupling. re- commended component placement is shown in figure 11. figure 11. recommended component placement l1 c in c out 3591 f11 v in ctrl led cap r sense sw 6 7 gnd 9 8 3 2 1 5 4
lt3591 12 3591f typical applications led current (ma) efficiency (%) 60 70 85 80 55 65 75 10 3491 ta02b 20 05 15 no schottky external schottky v in = 3.6v 10 leds led current (ma) 0 efficiency (%) 65 70 50 3591 ta03b 60 10 20 30 40 80 75 v in = 3.6v 4 leds li-ion driver for ten white leds ef? ciency li-ion driver for four white leds at 50ma ef? ciency sw v in l1 22 h d1 *optional v in 3v to 5v r sense 10 ? 3591 ta02a lt3591 shutdown and dimming control ctrl cap led gnd c2 2.2 f c1 1 f c1:taiyo yuden emk107bj105ma c2: murata grm31cr71h225ka88 l1: taiyo yuden nr4018t220m d1: phillips pmeg4005aea ctrl v in l1 10 h v in 3v to 5v r sense 3.92 ? 3591 ta03a lt3591 shutdown and dimming control sw cap led gnd c2 4.7 f c1 1 f c1:taiyo yuden emk107bj105ma c2: murata grm31cr71h475ka12l l1: murata lqh32cn100k53
lt3591 13 3591f typical applications cap led v in c2 4.7 f c1 1 f l1 22 h c1: taiyo yuden emk107bj105ma c2: murata grm31cr71h475ka12l c3: murata GRM21BR71H105KA12L l1: taiyo yuden nr4018t220m v in 3v pv in 24v r sense 2 ? 3591 ta05a lt3591 shutdown and dimming control ctrl sw gnd c3 1 f led current (ma) 0 70 efficiency (%) 75 95 3591 ta05b 20 40 60 80 100 80 85 90 cap led v in c2 4.7 f c1 1 f l1 22 h v in 3v pv in 24v r sense 2 ? 3591 ta06a lt3591 shutdown and dimming control ctrl sw gnd c3 1 f c1: taiyo yuden emk107bj105ma c2: murata grm31cr71h475ka12l c3: murata GRM21BR71H105KA12L l1: taiyo yuden nr4018t220m led current (ma) 70 efficiency (%) 80 95 90 75 85 40 80 3591 ta06b 100 20 060 24v to four white leds at 100ma ef? ciency 24v to five white leds at 100ma ef? ciency
lt3591 14 3591f typical applications ctrl v in c2 2.2 f c1 1 f l1 22 h v in 3v to 5v r sense 10 ? 3591 ta07a lt3591 shutdown and dimming control sw cap led gnd c1: taiyo yuden emk107bj105ma c2: murata grm31cr71h225ka88 l1: taiyo yuden nr4018t220m led current (ma) 0 efficiency (%) 50 55 60 15 85 80 3591 ta07b 510 20 65 70 75 v in = 3.6v 7 leds ctrl v in c2 2.2 f c1 1 f l1 22 h v in 3v to 5v r sense 10 ? 3591 ta08a lt3591 shutdown and dimming control sw cap led gnd c1: taiyo yuden emk107bj105ma c2: murata grm31cr71h225ka88 l1: taiyo yuden nr4018t220m led current (ma) 0 55 efficiency (%) 60 85 80 3591 ta08b 20 65 70 75 15 510 v in = 3.6v 8 leds li-ion driver for seven white leds conversion ef? ciency li-ion driver for eight white leds conversion ef? ciency
lt3591 15 3591f 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. package description ddb package 8-lead plastic dfn (3mm 2mm) (reference ltc dwg # 05-08-1702 rev b) 2.00 0.10 (2 sides) note: 1. drawing conforms to version (wecd-1) in jedec package outline m0-229 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on the top and bottom of package 0.40 0.10 bottom viewexposed pad 0.56 0.05 (2 sides) 0.75 0.05 r = 0.115 typ r = 0.05 typ 2.15 0.05 (2 sides) 3.00 0.10 (2 sides) 1 4 8 5 pin 1 bar top mark (see note 6) 0.200 ref 0 C 0.05 (ddb8) dfn 0905 rev b 0.25 0.05 2.20 0.05 (2 sides) recommended solder pad pitch and dimensions 0.61 0.05 (2 sides) 1.15 0.05 0.70 0.05 2.55 0.05 package outline 0.25 0.05 0.50 bsc pin 1 r = 0.20 or 0.25 45 chamfer 0.50 bsc
lt3591 16 3591f linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2007 lt 0207 ? printed in usa related parts typical application part number description comments lt1618 constant-current, constant voltage 1.24mhz, high ef? ciency boost regulator up to 16 white leds, v in : 1.6v to 18v, v out(max) = 34v, i q = 1.8ma, i sd < 1a, ms package lt1937 constant-current, 1.2mhz, high ef? ciency white led boost regulator up to 4 white leds, v in : 2.5v to 10v, v out(max) = 34v, i q = 1.9ma, i sd < 1a, thinsot tm /sc70 packages ltc ? 3200 low noise, 2mhz regulated charge pump white led driver up to 6 white leds, v in : 2.7v to 4.5v, i q = 8ma, i sd < 1a, ms package ltc3200-5 low noise, 2mhz regulated charge pump white led driver up to 6 white leds, v in : 2.7v to 4.5v, i q = 8ma, i sd < 1a, thinsot package ltc3201 low noise, 1.7mhz regulated charge pump white led driver up to 6 white leds, v in : 2.7v to 4.5v, i q = 6.5ma, i sd < 1a, ms package ltc3202 low noise, 1.5mhz regulated charge pump white led driver up to 8 white leds, v in : 2.7v to 4.5v, i q = 5ma, i sd < 1a, ms package ltc3205 high ef? ciency, multidisplay led controller up to 4 (main), 2 (sub) and rgb, v in : 2.8v to 4.5v, i q = 50a, i sd < 1a, 24-lead qfn package lt3465/lt3465a constant-current, 1.2mhz/2.7mhz, high ef? ciency white led boost regulator with integrated schottky diode up to 6 white leds, v in : 2.7v to 16v, v out(max) = 34v, i q = 1.9ma, i sd < 1a, thinsot package lt3466/lt3466-1 dual full function, 2mhz diodes white led step-up converter with built-in schottkys up to 20 white leds, v in : 2.7v to 24v, v out(max) = 39v, dfn, tssop-16 packages lt3486 dual 1.3a white led converter with 1000:1 true color pwm dimming drives up to 16 100ma white leds. v in : 2.5v to 24v, v out(max) = 36v, dfn, tssop packages lt3491 2.3mhz white led driver with integrated schottky diode drives up to 6 leds. v in : 2.5v to 12v, v out(max) = 27v, sc70 and dfn packages lt3497 dual full function 2.3mhz led driver with 250:1 true color pwm dimming with integrated schottky diodes up to 12 white leds, v in : 2.5v to 10v, v out(max) = 32v, 3mm 2mm dfn package thinsot is a trademark of linear technology corporation ctrl v in c2 2.2 f c1 1 f l1 22 h v in 3v to 5v r sense 10 ? 3591 ta09a lt3591 shutdown and dimming control sw cap led gnd c1: taiyo yuden emk107bj105ma c2: murata grm31cr71h225ka88 l1: taiyo yuden nr4018t220m led current (ma) 0 85 80 75 70 65 60 55 15 3591 ta09b 510 20 efficiency (%) v in = 3.6v 9 leds li-ion driver for nine white leds conversion ef? ciency

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