View LTC3216EDEPBF_6037091.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ltc3216 1 3216fc typical application features applications description 1a low noise high current led charge pump with independent torch/flash current control the ltc ? 3216 is a low noise, high current charge pump dc/dc converter designed to power high current leds. the part includes an accurate programmable current source capable of driving loads up to 1a from a 2.9v to 4.4v input. low external parts count (two ? ying capacitors, two programming resistors and two bypass capacitors at v in and cpo) make the ltc3216 ideally suited for small, battery-powered applications. built-in soft-start circuitry prevents excessive inrush cur- rent during start-up. high switching frequency enables the use of small external capacitors. independent high and low current settings are programmed by two external resistors. shutdown mode and current output levels are selected via two logic inputs. an ultralow dropout current source maintains accurate led current at very low i led voltages. automatic mode switching optimizes ef? ciency by monitoring the voltage across the led current source and switching modes only when i led dropout is detected. the ltc3216 is available in a small 3mm 4mm 12-lead dfn package. torch mode ef? ciency vs v in n high ef? ciency operation: 1x, 1.5x or 2x boost modes with automatic mode switching n ultralow dropout i led current control n output current up to 1a n low noise constant frequency operation n independent low current/high current programming and enable pins n wide v in range: 2.9v to 4.4v n open/shorted led protection n led disconnect in shutdown n low shutdown current: 2.5a n 4% led current programming accuracy n automatic soft-start limits inrush current n no inductors n tiny application circuit (all components <1mm pro? le) n 3mm 4mm 12-lead dfn package n led torch/camera light supply for cell phones, pdas and digital cameras n generic lighting and/or flash/strobe applications l , lt, ltc and ltm are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. protected by u.s. patents including 6411531. en1 0 1 0 1 c1 2.2f c2 2.2f c in 2.2f c cpo 4.7f led1 i led v in 2.9v to 4.4v en2 en1 ltc3216 c1 + c1 C c2 + c2 C i set1 i set2 0 (shutdown) 200ma (torch) 600ma 800ma (flash) en2 0 0 1 1 3216 ta01a led1: lumileds lxcl-pwf1 luxeon flash cpo 20k 1% 6.65k 1% en2 (flash) en1 (torch) i led v in (v) 2.8 efficiency (p led /pin) (%) 100 90 80 70 60 50 40 30 20 10 0 3.2 3.6 3.8 3216 ta01b 3.0 3.4 4.0 4.2 4.4 p led /pin lumileds lxcl-pwf1 v f = 3v typ at 200ma i led = 200ma
ltc3216 2 3216fc pin configuration absolute maximum ratings v in to gnd ................................................ ?0.3v to 5.5v cpo to gnd .............................................. ?0.3v to 5.5v en2, en1 ...........................................?0.3v to v in + 0.3v i cpo , i iled (note 2) .............................................1500ma cpo short-circuit duration .............................. inde? nite operating temperature range (note 3).... ?40c to 85c storage temperature range ................... ?65c to 125c (note 1) 12 11 10 9 8 7 1 2 3 4 5 6 c1 ? gnd c2 ? vin en2 en1 c2 + c1 + cpo i set1 i led i set2 top view de12 package 12-lead (4mm 3mm) plastic dfn exposed pad is gnd (pin 13) must be soldered to pcb 13 t jmax = 125c, ja = 43c/w order information lead free finish tape and reel part marking package description temperature range ltc3216ede#pbf ltc3216ede#trpbf 3216 12-lead (4mm 3mm) plastic dfn ?40c to 85c consult ltc marketing for parts speci? ed with wider operating temperature ranges. consult ltc marketing for information on non-standard lead based ? nish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel speci? cations, go to: http://www.linear.com/tapeandreel/ electrical characteristics the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. v in = 3.6v, c in = c1 = c2 = 2.2f, c cpo = 4.7f. parameter conditions min typ max units input power supply v in operating voltage
ltc3216 3 3216fc electrical characteristics 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: based on long-term current density limitations. assumes an operating duty cycle of 10% under absolute maximum conditions for durations less than 10 seconds. max current for continuous operation is 500ma. the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. v in = 3.6v, c in = c1 = c2 = 2.2f, c cpo = 4.7f. note 3: the ltc3216e is guaranteed to meet performance speci? cations from 0c to 85c. speci? cations over the C40c to 85c operating temperature range are assured by design, characterization and correlation with statistical process controls. i led dropout voltage vs led current i led pin current vs i led pin voltage i led vs r set typical performance characteristics (t a = 25c unless otherwise speci? ed) parameter conditions min typ max units 2x mode output impedance v in = 3.2v, v cpo < 5.1v, c1 = c2 = 2.2f 1.7 clk frequency o 0.6 0.9 1.2 mhz cpo short-circuit detection threshold voltage en1/en2 = high o 0.5 1.5 v test current en1 = en2 = low, v cpo = 0v o 10 30 ma en1, en2 high level input voltage (v ih ) o 1.4 v low level input voltage (v il ) o 0.4 v input current (i ih ) o C1 1 a input current (i il ) o C1 1 a i set1 , i set2 v iset1 , v iset2 i setx = 50a o 1.195 1.22 1.245 v i iset1 , i iset2 o 321 a led current (ma) 0 200 dropout voltage (v) 400 800 600 1000 3216 g01 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 v in = 3.6v i led pin voltage (v) 0 i led pin current (ma) 600 500 400 300 200 100 0 0.2 0.4 0.6 0.8 3216 g02 1.0 i led = 500ma 400ma 300ma 200ma 100ma r set (k) i led (ma) 1573 g03 1200 1000 800 600 400 200 0 0 10 20 25 515 30 35 40
ltc3216 4 3216fc typical performance characteristics input shutdown current vs input voltage oscillator frequency vs supply voltage ef? ciency vs v in i set /i led current ratio vs i led current 1.5x mode cpo output ripple 1x mode charge pump open- loop output resistance vs temperature 1.5x mode charge pump open-loop output resistance (1.5v in C v cpo )/i cpo vs temperature 2x mode charge pump open-loop output resistance (2v in C v cpo )/i cpo vs temperature (t a = 25c unless otherwise speci? ed) temperature ( c) C40 switch resistance () 35 85 3216 g04 C15 10 60 0.31 0.29 0.27 0.25 0.23 0.21 0.19 0.17 0.15 i cpo = 200ma v in = 3.6v v in = 3.3v v in = 3.9v temperature ( c) C40 output resistance () 10 60 85 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 3216 g05 C15 35 v in = 3v v cpo = 4.2v c in = c1 = c2 = 2.2f c cpo = 4.7f C40 10 60 85 C15 35 temperature ( c) output resistance () 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 3216 g06 v in = 3v v cpo = 4.8v c in = c1 = c2 = 2.2f c cpo = 4.7f 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 input shutdown current (a) 3216 g07 input voltage (v) 2.9 4.5 3.3 3.7 4.1 3.1 3.5 3.9 4.3 t a = 85 c t a = C40 c t a = 25 c frequency (khz) 930 920 910 900 890 880 870 860 850 840 3216 g08 supply voltage (v) 2.9 4.5 3.3 3.7 4.1 3.1 3.5 3.9 4.3 t a = 85 c t a = C40 c t a = 25 c v in (v) 2.8 efficiency (pled/pin) (%) 100 90 80 70 60 50 40 30 20 10 0 3.2 3.6 3.8 3216 g09 3.0 3.4 4.0 4.2 4.4 led = lxcl-pwf1 lumileds 600ma i led = 800ma 400ma 200ma i led current(ma) 0 current ratio 200 400 500 900 3216 g10 100 300 600 700 800 3400 3350 3300 3250 3200 3150 3100 t a = 85 c t a = C40 c t a = 25 c 3216 g11 v cpo 50mv/div a/c coupled 500ns/div v in = 3.6v i cpo = 200ma
ltc3216 5 3216fc 2x mode cpo output ripple charge pump mode switching and input current typical performance characteristics pin functions c2 + , c1 + , c2 C , c1 C (pins 1, 2, 10, 12): charge pump flying capacitor pins. a 2.2f x5r or x7r ceramic ca- pacitor should be connected from c1 + to c1 C and from c2 + to c2 C . cpo (pin 3): output. cpo is the output of the charge pump. this pin may be enabled or disabled using the en1 and en2 inputs. a 4.7f x5r or x7r ceramic capacitor is required from cpo to gnd. i set1 /i set2 (pins 4, 6): led current programming resistor pins. the i set1 and i set2 pins will servo to 1.22v. resistors connected between each of these pins and gnd are used to set the high and low led current levels. connecting a resistor of 2k or less will cause the ltc3216 to enter overcurrent shutdown mode. i led (pin 5): output. i led is the led current source output. the led is connected between cpo (anode) and i led (cathode). the current into the i led pin is set via the en1 and en2 inputs, and the programming resistors connected from i set2 and i set1 to gnd. en1/en2 (pins 7, 8): inputs. the en1 and en2 pins are used to select which current level is being supplied to the led, as well as to put the part into shutdown mode. the truth table for these pins is as follows: truth table en1 en2 mode 0 0 shutdown 1 0 low current 0 1 high current 1 1 low + high current v in (pin 9): power. supply voltage for the ltc3216. v in should be bypassed with a 2.2f or greater low impedance ceramic capacitor to gnd. gnd (pin 11): charge pump ground. this pin should be connected directly to a low impedance ground plane. exposed pad (pin 13): control signal ground. this pad must be soldered to a low impedance ground plane for optimum thermal and electrical performance. (t a = 25c unless otherwise speci? ed) 3216 g12 v cpo 20mv/div a/c coupled 500ns/div v in = 3.6v i cpo = 400ma 1ms/div en2 5v/div i vin 500ma/div v cpo 1v/div 3216 g13 v in = 3v
ltc3216 6 3216fc block diagram operation the ltc3216 uses a fractional switched capacitor charge pump to power a high current led with a programmed regulated current. the part starts up into the 1x mode. in this mode, v in is directly connected to cpo. this mode provides maximum ef? ciency and minimum noise. the ltc3216 will remain in this mode until the led current source begins to dropout. when dropout is detected, the ltc3216 will switch to 1.5x mode after a soft-start period. any subsequent dropout detected will cause the part to enter 2x mode. the part may be reset to 1x mode by bringing the part into shutdown mode and then reen- abling the part. a two phase nonoverlapping clock activates the charge pump switches. in the 2x mode, the ? ying capacitors are charged on alternate clock phases from v in . while one capacitor is being charged from v in , the other is stacked on top of v in and connected to the output. alternatively, in the 1.5x mode the ? ying capacitors are charged in series during the ? rst clock phase, and stacked in parallel on top of v in on the second clock phase. this sequence of charging and discharging the ? ying capacitors continues at a free running frequency of 900khz (typ). the current delivered to the led load is controlled by the internal programmable current source. three discrete current settings (low, high and low + high) are avail- able and may be selected via the en2 and en1 pins. the values of these currents may be selected by choosing the appropriate programming resistors. each resistor is 2 3 5 13 11 12 4 6 C + 1 10 1x mode: cpo = v in 1.5x mode: cpo = 4.6v 2x mode: cpo = 5.1v v ref dropout detector current source control control logic mode control oscillator 8 9 7 gnd cpo i led gnd i set2 i set1 v in en1 en2 c1 + c1 C c2 + c2 C 3216 bd
ltc3216 7 3216fc operation connected between the i set2 or i set1 pin and gnd. the resistor values needed to attain the desired current levels can be determined by equation 1. r set1/2 = 3965/i led (1) a resistor value of 2k or less (i.e. a short-circuit) will cause the ltc3216 to enter overcurrent shutdown mode. this mode will prevent damage to the part by shutting down the high power sections of the chip. regulation is achieved by sensing the voltage at the cpo pin and modulating the charge pump strength based on the error signal. the cpo regulation voltages are set internally, and are dependent on the charge pump mode as shown in table 1. table 1. charge pump output regulation voltages charge pump mode v cpo 1.5x 4.6v 2x 5.1v in shutdown mode all circuitry is turned off and the ltc3216 draws a very low current from the v in supply. furthermore, cpo is weakly connected to v in . the ltc3216 enters shutdown mode when both the en1 and en2 pins are brought low. since en1 and en2 are high impedance cmos inputs they should never be allowed to ? oat. to ensure that their states are de? ned they must always be driven with valid logic levels. thermal protection the ltc3216 has built-in overtemperature protection. ther- mal shutdown circuitry will shutdown the i led output when the junction temperature exceeds approximately 150c. it will re-enable the i led output once the junction temperature drops back to approximately 135c. the ltc3216 will cycle in and out of thermal shutdown inde? nitely without latch up or damage until the heat source is removed. soft-start to prevent excessive inrush current during start-up and mode switching, the ltc3216 employs built-in soft-start circuitry. soft-start is achieved by increasing the amount of current available to the output charge storage capacitor linearly over a period of approximately 250s. charge pump strength when the ltc3216 operates in either the 1.5x mode or 2x mode, the charge pump can be modeled as a theve- nin-equivalent circuit to determine the amount of current available from the effective input voltage and effective open-loop output resistance, r ol (figure 1). figure 1. charge pump open-loop thevenin-equivalent circuit C + + C cpo r ol 1.5v in or 2v in r ol is dependent on a number of factors including the oscillator frequency, ? ying capacitor values and switch resistances. from figure 1, we can see that the output current is proportional to: (1.5v in C cpo)/r ol or (2v in C cpo)/r ol (2) in the 1.5x mode or 2x mode respectively. current levels the ltc3216 may be programmed to have three discrete current levels. these are the low, high and low + high current levels. the low and high currents are set by the resistors connected between i set1 and i set2 pins, respectively, to gnd. the low + high current mode supplies a current that is equal to sum of the low and high currents. due to the low output impedance of this part, care should be taken in selecting current levels. this part can supply up to 500ma continuously, and up to 1a for pulsed operation with a 10% duty cycle. pulsed operation may be achieved by toggling the en1 and en2 bits. in either continuous or pulsed operation, proper board layout is required for effective heat sinking. mode switching the ltc3216 will automatically switch from 1x mode to 1.5x mode, and subsequently from 1.5x mode to 2x mode
ltc3216 8 3216fc v in , cpo capacitor selection the style and value of capacitors used with the ltc3216 determine several important parameters such as regulator control loop stability, output ripple, charge pump strength and minimum start-up time. to reduce noise and ripple, it is recommended that low equivalent series resistance (esr) ceramic capacitors be used for both c vin and c cpo . tantalum and aluminum capacitors are not recommended because of their high esr. the value of c cpo directly controls the amount of output ripple for a given load current. increasing the size of c cpo will reduce the output ripple at the expense of higher start-up current. the peak-to-peak output ripple for 1.5x mode is approximately given by the expression: v ripple(p-p) = i out /(3f osc ? c cpo ) (3) where f osc is the ltc3216s oscillator frequency (typically 900khz) and c cpo is the output storage capacitor. both the style and value of the output capacitor can sig- ni? cantly affect the stability of the ltc3216. as shown in the block diagram, the ltc3216 uses a control loop to adjust the strength of the charge pump to match the cur- rent required at the output. the error signal of this loop is stored directly on the output charge storage capacitor. the charge storage capacitor also serves as the dominant pole for the control loop. to prevent ringing or instability, it is important for the output capacitor to maintain at least 2.2f of actual capacitance over all conditions. likewise, excessive esr on the output capacitor will tend to degrade the loop stability of the ltc3216. the closed loop output resistance of the ltc3216 is designed to be 76m. for a 100ma load current change, the error signal will change by about 7.6mv. if the output capacitor has 76m or more of esr, the closed-loop frequency response will cease to roll off in a simple one pole fashion and poor load transient response of instability could result. multilayer ceramic chip capacitors typically have exceptional esr performance. mlccs combined with a tight board layout will yield very good stability. as the value of c cpo controls the amount of output ripple, the value of c vin controls the amount of ripple present at the input pin (v in ). the input current to the ltc3216 will be relatively constant while the charge pump is on either the input charging phase or the output charging phase but will drop to zero during the clock nonoverlap times. since the nonoverlap time is small (~15ns), these missing notches will result in only a small perturbation on the input power supply line. note that a higher esr capacitor such as tantalum will have higher input noise due to the input current change times the esr. therefore, ceramic capacitors are again recommended for their exceptional esr performance. input noise can be further reduced by powering the ltc3216 through a very small series inductor as shown in figure 2. a 10nh inductor will reject the fast current notches, thereby presenting a nearly constant current load to the input power supply. for economy, the 10nh inductor can be fabricated on the pc board with about 1cm (0.4") of pc board trace. operation whenever a dropout condition is detected at the i led pin. in the low current mode, the part will wait approximately 150ms after dropout is detected before switching to the next mode. in the high and low + high current modes, the part will wait approximately 2ms before switching to the next mode. these delays allow the led to warm up and reduce its forward voltage which may remove the dropout condition. in order to reset the part back into 1x mode, the ltc3216 must be brought into shutdown (en1 = en2 = low). im- mediately after the part has been brought to shutdown, it may be set to the desired output current level via the en1 and en2 pins. an internal comparator will not allow the main switches to connect v in and cpo in 1x mode until the voltage at the cpo pin has decayed to less than or equal to the voltage at the v in pin. applications information
ltc3216 9 3216fc applications information flying capacitor selection warning: polarized capacitors such as tantalum or alumi- num should never be used for the ? ying capacitors since their voltage can reverse upon start-up of the ltc3216. ceramic capacitors should always be used for the ? ying capacitors. the ? ying capacitors control the strength of the charge pump. in order to achieve the rated output current it is necessary to have at least 2.2f of actual capacitance for each of the ? ying capacitors. capacitors of different materials lose their capacitance with higher temperature and voltage at different rates. for example, a ceramic capacitor made of x7r material will retain most of its capacitance from C 40 o c to 85 o c whereas a z5u or y5v style capacitor will lose considerable capacitance over that range. z5u and y5v capacitors may also have a very poor voltage coef? cient causing them to lose 60% or more of their capacitance when the rated voltage is applied. therefore, when comparing different capacitors, it is often more appropriate to compare the amount of achievable capacitance for a given case size rather than comparing the speci? ed capacitance value. for example, over rated voltage and temperature conditions, a 1f, 10v, y5v ceramic capacitor in a 0603 case may not provide any more capacitance than a 0.22f, 10v, x7r available in the same case. the capacitor manufacturers data sheet should be consulted to determine what value of capacitor is needed to ensure minimum capacitances at all temperatures and voltages. table 2 shows a list of ceramic capacitor manufacturers and how to contact them. table 2. recommended capacitor vendors avx www.avxcorp.com kemet www.kemet.com murata www.murata.com taiyo yuden www.t-yuden.com vishay www.vishay.com tdk www.tdk.com layout considerations and noise due to its high switching frequency and the transient currents produced by the ltc3216, careful board layout is necessary. a true ground plane and short connections to all capacitors will improve performance and ensure proper regulation under all conditions. the ? ying capacitor pins c1 + , c2 + , c1 C and c2 C will have very high edge rate waveforms. the large dv/dt on these pins can couple energy capacitively to adjacent pcb runs. magnetic ? elds can also be generated if the ? ying capacitors are not close to the ltc3216 (i.e., the loop area is large). to decouple capacitive energy transfer, a faraday shield may be used. this is a grounded pcb trace between the sensitive node and the ltc3216 pins. for a high quality ac ground, it should be returned to a solid ground plane that extends all the way to the ltc3216. power ef? ciency to calculate the power ef? ciency ( ) of a white led driver chip, the led power should be compared to the input power. the difference between these two numbers represents lost power whether it is in the charge pump or the current sources. stated mathematically, the power ef? ciency is given by: (4) p led p i n the ef? ciency of the ltc3216 depends upon the mode in which it is operating. recall that the ltc3216 operates as a pass switch, connecting v in to cpo, until dropout is detected at the i led pin. this feature provides the op- timum ef? ciency available for a given input voltage and figure 2. 10nh inductor used for input noise reduction (approximately 1cm of wire) v in gnd ltc3216 2.2f 0.1f 10nh 3216 f02
ltc3216 10 3216fc applications information led forward voltage. when it is operating as a switch, the ef? ciency is approximated by: (5) p led p i n = v led ?i led v in ?i i n v led v i n since the input current will be very close to the led current. at moderate to high output power, the quiescent current of the ltc3216 is negligible and the expression above is valid. once dropout is detected at the i led pin, the ltc3216 enables the charge pump in 1.5x mode. in 1.5x boost mode, the ef? ciency is similar to that of a linear regulator with an effective input voltage of 1.5 times the actual input voltage. this is because the input current for a 1.5x charge pump is approximately 1.5 times the load current. in an ideal 1.5x charge pump, the power ef? ciency would be given by: (6) ideal p led p i n = v led ?i led v in ? 1.5i le d v led 1.5v i n similarly, in 2x boost mode, the ef? ciency is similar to that of a linear regulator with an effective input voltage of 2 times the actual input voltage. in an ideal 2x charge pump, the power ef? ciency would be given by: (7) ideal p led p i n = v led ?i led v in ?2?i le d v led 2?v i n thermal management for higher input voltages and maximum output current, there can be substantial power dissipation in the ltc3216. if the junction temperature increases above approximately 150c, the thermal shutdown circuitry will automatically deactivate the output. to reduce maximum junction tem- perature, a good thermal connection to the pc board is recommended. connecting the exposed pad to a ground plane and maintaining a solid ground plane under the device can reduce the thermal resistance of the package and pc board considerably.
ltc3216 11 3216fc 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 de package 12-lead plastic dfn (4mm 3mm) (reference ltc dwg # 05-08-1695) 4.00 0.10 (2 sides) 3.00 0.10 (2 sides) note: 1. drawing proposed to be a variation of version (wged) 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 view?exposed pad 1.70 0.10 0.75 0.05 r = 0.115 typ r = 0.05 typ 2.50 ref 1 6 12 7 pin 1 notch r = 0.20 or 0.35 45 chamfer pin 1 top mark (note 6) 0.200 ref 0.00 ? 0.05 (ue12/de12) dfn 0806 rev d 2.50 ref recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 2.20 0.05 0.70 0.05 3.60 0.05 package outline 3.30 0.10 0.25 0.05 0.50 bsc 1.70 0.05 3.30 0.05 0.50 bsc 0.25 0.05
ltc3216 12 3216fc linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 o fax: (408) 434-0507 o www.linear.com ? linear technology corporation 2004 lt 0208 rev c ? printed in usa related parts typical application high power camera light and flash c1 2.2f c2 2.2f c in 2.2f c cpo 4.7f i led (total) = 200ma/400ma 2.9v to 4.4v r set1 = 20k 1% r set2 = 10k 1% 3216 ta02 i led v in en2 en1 ltc3216 c1 + c1 C c2 + c2 C i set1 i set2 cpo en1 (torch) en2 (flash) part number description comments lt1618 constant current, 1.4mhz, 1.5a boost converter v in : 1.6v to 18v, v out(max) = 36v, i q = 1.8ma, i sd < 1a ms package lt1961 1.5a (i sw ), 1.25mhz, high ef? ciency step-up dc/dc converter v in : 3v to 25v, v out(max) = 35v, i q = 0.9ma, i sd 6a ms8e package ltc3205 250ma, 1mhz, multi-display led controller v in : 2.8v to 4.5v, v out(max) = 5.5v, i q = 50ua, i sd < 1a dfn package ltc3206 400ma, 800khz, multi-display led controller v in : 2.8v to 4.5v, v out(max) = 5.5v, i q = 50ua, i sd < 1a dfn package ltc3453 1mhz, 800ma synchronous buck-boost high power led driver v in(min) : 2.7v to 5.5v, v in(max) : 2.7v to 4.5v, i q = 2.5ma, i sd < 6a qfn package lt3467/lt3467a 1.1a (i sw ), 1.3/2.1mhz, high ef? ciency step-up dc/dc converter with integrated soft-start v in : 2.4v to 16v, v out(max) = 40v, i q = 1.2ma, i sd < 1a thinsot package lt3479 3a, full featured dc/dc converter with soft-start and inrush current protection v in : 2.5v to 24v, v out(max) = 40v, i q = 5ma, i sd < 1a dfn, tssop packages

▲Up To Search▲

Price & Availability of LTC3216EDEPBF

	To Download LTC3216EDEPBF Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .