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lt3663 1 3663fb output current (a) 0.1 efficiency (%) 100 90 80 70 60 50 40 0.5 0.9 0.3 0.7 1.1 3663 ta01b 1.3 v in = 15v v in = 8v v in = 30v typical application description 1.2a step-down switching regulator with output current limit the lt ? 3663 is a current mode step-down switching regu- lator with programmable output current limit. the current limit accurately controls the system power dissipation and reduces the size of the power path components. the wide operating input voltage range of 7.5v to 36v (60v transient) suits the lt3663 to a variety of input sources, including unregulated 12v wall adapters, 24v industrial supplies, and automotive power. the lt3663 includes a low current shutdown mode, input overvoltage and undervoltage lockout, and thermal shut- down. internal compensation and boost diode minimize the number of external exponents. 3.3v and 5v ? xed output voltage versions are available. the lt3663 is available in 8-lead dfn and msop packages with exposed pads for low thermal resistance. l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. 5v step-down converter features applications n wide input range: operation from 7.5v to 36v overvoltage lockout protects circuit through 60v transients n programmable output current limit (0.4a to 1.2a) n 3.3v and 5v fixed output voltage options n integrated boost diode n fixed frequency, peak current mode control lt3663 f sw = 1.5mhz lt3663-x f sw = 1mhz n low switch v cesat : 275mv at 1a n internally compensated n thermal protection n thermally enhanced 8-pin 2mm 3mm dfn and msop packages n distributed supply regulation n automotive battery regulation n industrial supplies n wall transformer regulation ef? ciency 3663 ta01 lt3663 v in v in run i lim boost sw gnd 0.1f 2.2f 22f 59k 28.7k 11k 6.8h i sense v out v out fb on off
lt3663 2 3663fb absolute maximum ratings input voltage (v in ) (note 2) ......................................60v boost pin voltage ...................................................50v boost pin above sw pin .........................................25v v outs , v out , i sense , fb pins .......................................6v run pin (note 2) ......................................................60v (note 1) order information lead free finish tape and reel part marking* package description temperature range lt3663edcb#pbf lt3663edcb#trpbf ldvk 8-lead (2mm 3mm) plastic dfn C40c to 125c lt3663idcb#pbf lt3663idcb#trpbf ldvk 8-lead (2mm 3mm) plastic dfn C40c to 125c lt3663edcb-3.3#pbf lt3663edcb-3.3#trpbf lfmw 8-lead (2mm 3mm) plastic dfn C40c to 125c lt3663idcb-3.3#pbf lt3663idcb-3.3#trpbf lfmw 8-lead (2mm 3mm) plastic dfn C40c to 125c lt3663edcb-5#pbf lt3663edcb-5#trpbf lfmy 8-lead (2mm 3mm) plastic dfn C40c to 125c lt3663idcb-5#pbf lt3663idcb-5#trpbf lfmy 8-lead (2mm 3mm) plastic dfn C40c to 125c lt3663ems8e#pbf lt3663ems8e#trpbf ltdwt 8-lead plastic msop C40c to 125c lt3663ims8e#pbf lt3663ims8e#trpbf ltdwt 8-lead plastic msop C40c to 125c lt3663hms8e#pbf lt3663hms8e#trpbf ltdwt 8-lead plastic msop C40c to 150c lt3663ems8e-3.3#pbf lt3663ems8e-3.3#trpbf ltfmx 8-lead plastic msop C40c to 125c lt3663ims8e-3.3#pbf lt3663ims8e-3.3#trpbf ltfmx 8-lead plastic msop C40c to 125c lt3663hms8e-3.3# pbf lt3663 hms8e-3.3#trpbf l tfmx 8-lead plastic msop C40c to 150c lt3663ems8e-5#pbf lt3663ems8e-5#trpbf ltfmz 8-lead plastic msop C40c to 125c operating junction temperature range (note 3) lt3663e ............................................. C40c to 125c lt3663i .............................................. C40c to 125c lt3663h ............................................ C40c to 150c storage temperature .............................. C65c to 150c pin configuration lt3663 top view sw boost i sense v out v in run fb i lim dcb package 8-lead (2mm 3mm) plastic dfn 9 gnd 3 4 2 1 6 5 7 8 lt3663-x top view sw boost i sense v out v in run v outs i lim dcb package 8-lead (2mm 3mm) plastic dfn 9 gnd 3 4 2 1 6 5 7 8 ja = 64c/w exposed pad (pin 9) is gnd, must be soldered to pcb ja = 64c/w exposed pad (pin 9) is gnd, must be soldered to pcb lt3663 1 2 3 4 v in run fb i lim 8 7 6 5 sw boost i sense v out top view 9 gnd mse package 8-lead plastic msop lt3663-x 1 2 3 4 v in run v outs i lim 8 7 6 5 sw boost i sense v out top view 9 gnd mse package 8-lead plastic msop ja = 35c/w exposed pad (pin 9) is gnd, must be soldered to pcb ja = 35c/w exposed pad (pin 9) is gnd, must be soldered to pcb
lt3663 3 3663fb 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: absolute maximum voltage at v in and run pins is 60v for nonrepetitive 1 second transients. note 3: the lt3663e is guaranteed to meet performance speci? cations from 0c to 125c. speci? cations over the C40c to 125c operating temperature range are assured by design, characterization, and correlation with statistical process controls. the lt3663i speci? cations the l denotes the speci? cations which apply over the full operating temperature range, otherwise speci? cations are at t a = 25c. v in = 12v, r ilim = 36.5k unless otherwise noted. parameter conditions min typ max units v in undervoltage lockout rising l 7 7.5 v v in undervoltage lockout hysteresis 500 mv v in overvoltage lockout rising l 36 39 41 v v in overvoltage lockout hysteresis 1v v in supply current not switching 2.4 3.2 ma v in supply current in shutdown v run = 0v 0.01 2 a run input voltage high 2.5 v run input voltage low 0.3 v run pin bias current v run = 2.3v (note4) v run = 0v 6 0.01 15 0.1 a a v out current limit range l 0.4 1.2 a v out current limit l 0.8 1 1.2 a operating frequency lt3663 lt3663-x 1350 900 1500 1000 1650 1100 khz khz maximum duty cycle l 80 92 % feedback voltage lt3663 l 784 800 816 mv fb bias current v fb = 0.8v, lt3663 50 150 na regulated output voltage lt3663-3.3 lt3663-5 l l 3.234 4.900 3.3 5 3.366 5.100 v v v outs bias current lt3663-x 90 120 a switch peak current limit (note 5) l 1.6 2 2.5 a switch v cesat i sw = 1a 275 mv minimum boost voltage i sw = 1a (note 6) 1.85 2.2 v boost diode drop i diode = 60ma 0.9 1.2 v boost pin current i sw = 1a 28 ma are guaranteed over the full C40c to 125c temperature range. the lt3663h speci? cations are guaranteed over the C40c to 150c operating temperature range. high junction temperatures degrade operating lifetimes. operating lifetime is derated at junction temperatures greater than 125c. note 4: current ? ows into pin. note 5: switch peak current limit guaranteed by design and/or correlation to static test. note 6: this is the minimum voltage across the boost capacitor needed to guarantee full saturation of the switch. lead free finish tape and reel part marking* package description temperature range lt3663ims8e-5#pbf lt3663ims8e-5#trpbf ltfmz 8-lead plastic msop C40c to 125c lt3663hms8e-5#pbf lt3663hms8e-5#trpbf ltfmz 8-lead plastic msop C40c to 150c consult ltc marketing for parts speci? ed with wider operating temperature ranges. *the temperature grade is identi? ed by a label on the shipping container. 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/ order information
lt3663 4 3663fb minimum switch on-time run pin current output current limit feedback voltage temperature (c) C50 output current limit (a) 50 0 100 3663 g04 150 125 25 C25 75 1.20 1.15 1.05 1.10 1.00 0.90 0.95 0.85 0.80 r ilim = 36.5k temperature (c) C50 feedback voltage (v) 50 0 100 3663 g05 150 125 25 C25 75 0.84 0.82 0.80 0.78 0.76 temperature (c) C50 minimum switch-on time (ns) 50 0 100 3663 g10 150 125 25 C25 75 140 120 100 80 40 60 20 0 run pin voltage (v) 0 run pin current (a) 30 10 50 3663 g11 60 20 40 45 40 30 35 25 15 5 20 10 0 temperature (c) switching frequency (mhz) 1.6 3663 g02 0.9 1.0 1.1 1.2 1.3 1.4 1.5 C50 C25 0 25 50 75 100 150 125 lt3663-x lt3663 switching frequency output current (a) output voltage (v) 6 5 4 3663 g12 0 1 2 3 0 0.2 0.4 0.6 0.8 1 1.2 1.4 r ilim = 28.7k output current limit typical performance characteristics t a = 25c, unless otherwise noted. v in shutdown current v in overvoltage lockout temperature (c) C50 input voltage (v) 50 0 100 3663 g06 150 125 25 C25 75 42 32 33 34 35 36 37 38 39 40 41 rising falling v in voltage (v) 0 v in current (a) 30 10 50 3663 g08 60 20 40 800 700 500 600 400 200 300 100 0 v run = 0v temperature (c) input voltage (v) 8.0 7.5 7.0 3663 g03 4.0 4.5 5.0 5.5 6.0 6.5 C50 C25 0 25 50 75 100 150 125 rising falling v in undervoltage lockout
lt3663 5 3663fb typical performance characteristics boost pin current boost diode v f t a = 25c, unless otherwise noted. switch current (a) boost pin current (ma) 35 30 25 20 3653 g07 0 5 15 10 0 0.2 0.4 0.5 0.8 1.0 1.2 diode current (ma) boost diode v f (v) 1.4 1.2 1 0.8 3653 g09 0 0.2 0.6 0.4 0 50 100 150 200 250 300 switch current (a) switch voltage drop (mv) 400 350 3663 g01 0 50 100 150 200 250 300 0 0.2 0.4 0.6 0.8 1 1.2 125c C45c 25c switch voltage drop pin functions boost: the boost pin is used to provide a drive voltage, higher than the input voltage, to the internal power switch. the boost pin is also internally connected to the cathode of the boost diode. gnd (exposed pad pin 9) : ground. the exposed pad must be soldered to the pcb and electrically connected to ground. use a large ground plane and thermal vias to optimize thermal performance. fb (lt3663): the lt3663 regulates the fb pin to 0.8v. connect the feedback resistor divider tap to this pin. i lim : output current limit program pin. connect a resistor to ground to program the regulator output current limit. i sense : the i sense pin is the positive input to the internal output current limit sense resistor. the i sense pin is also the anode to the internal boost diode. run: the run pin is used to put the lt3663 into shutdown mode. tie to ground to shut down the lt3663. tie to 2.5v or more for normal operation. if the shutdown feature is not used, connect this pin to v in . sw: the sw pin is the output of the internal power switch. connect this pin to the inductor, catch diode and boost capacitor. v in : the v in pin supplies current to the lt3663s internal regulator and internal power switch. capacitively bypass the pin to ground. v out : the v out pin is connected to the negative terminal of the internal output current limit sense resistor. v outs (lt3663-x): output voltage sense pin. connect to the positive terminal of the output capacitor.
lt3663 6 3663fb functional block diagram 2.5v internal regulator, reference, uvlo and ovp oscillator slope compensation c3 r sense1 v in sw q1 r sense2 r1 note: resistor divider is internal on lt3663-x versions. exposed pad (gnd) 3663 bd boost i sense v out c1 r ilim v in internal compensation d1 d2 r s q C + C + C + driver l c2 v out C + g2 a1 0.8v C + g1 i lim v c r2 fb run
lt3663 7 3663fb operation the lt3663 is a constant frequency, current mode step down regulator. a switch cycle is initiated when the os- cillator enables the rs ? ip ? op, turning on the internal power switch, q1. the sense ampli? er (a1) monitors the switch current via the voltage dropped across the current sense resistor r sense1 . the comparator compares the ampli? ed current signal with the output (v c ) of the error ampli? er (g1). the switch is turned off when this current exceeds a value determined by the v c voltage. the error ampli? er monitors the v out voltage through an internal resistor divider and, when not driven externally, servos the v c voltage to regulate v out . if the v out voltage drops, the v c voltage will be driven higher increasing the output current and v out voltage. an active clamp (not shown) on the v c node provides current limit. the lt3663 is internally compensated with a pole-zero combination on the v c node. an external capacitor and internal diode, d2, generate a voltage at the boost pin that is higher than the input supply. (refer to block diagram) this allows the driver to fully saturate the internal bipolar npn power switch for ef? cient operation. the switch driver operates from either v in or boost to ensure startup. an internal regulator provides power to the control circuitry. this regulator includes input undervoltage and overvoltage protection which disables switching action when v in is out of range. when switching is disabled, the lt3663 safely sustains input voltages up to 60v. note that while switching is disabled the output will discharge. output current limiting is provided via the servo action of ampli? er g2. the voltage across sense resistor, r sense2 , is compared to a voltage programmed by external resistor r ilim on the i lim pin. a capacitor averages the inductor ripple current. if the average inductor current exceeds the programmed value then the v c voltage is pulled low, reduc- ing the current in the regulator. the output current limit circuit allows for a lower current rated inductor and diode and provides better control of system power dissipation.
lt3663 8 3663fb 2.5s/div 3663 f02 v sw 20v/div i l 1a/div v out 200mv/div ac-coupled figure 2. pulse-skip mode v sw 20v/div i l 1a/div v out 200mv/div ac-coupled 2.5s/div 3663 f01 applications information fb resistor network the output voltage of the lt3663 is programmed with a resistor divider. choose the 1% resistors according to: r1 = r2 (v out /0.8 C 1) reference designators refer to the block diagram. the resistor divider is internal on the ? xed output voltage versions, lt3663-x. minimum duty cycle as the input voltage increases the duty cycle decreases. at some point, the minimum duty cycle of the ic is reached and pulse skipping begins. the output voltage continues to regulate but the output voltage ripple increases. the input voltage at which this occurs is calculated as follows: v vv dc vv in out f min fsw = + () + ? where v f is the forward voltage drop of the catch diode, d1, and v sw is the voltage drop on the internal switch, q1. lt3663 dc min is typically 0.12. for v f = 0.4v, v sw = 0.3v, and v out = 3.3v pulse skipping occurs at about 24.5v. figure 1 illustrates switching waveforms in normal mode for a 3.3v output application with v in = 20v. figure 2. illustrates switching waveforms in pulse skip mode a 3.3v output application with v in = 30v. figure 1. normal operation inductor selection a good ? rst choice for the inductor value is: l = v out + v d (h) where v d is the voltage drop of the catch diode (~0.4v) and l is in h. with this value there is no sub-harmonic oscillation for applications with 50% or greater duty cycle. the inductors rms current rating must be greater than the maximum load current. size the inductor so the saturation current rating is about 30% higher than the maximum load current. the output current limit circuit tightly controls the maximum average inductor current, therefore the inductor rms current rating does not have to be overrated to handle short circuit or overload condi- tions. for high ef? ciency, keep the series resistance (dcr) less than 0.1. a higher value inductor is larger in size and slows transient response but reduces output voltage ripple. a lower value inductor has higher ripple currents but is physically smaller or, for the same size, it has lower dcr typically resulting in higher ef? ciency.
lt3663 9 3663fb applications information catch diode the catch diode conducts current only during switch-off time. average forward current in normal operation is calculated from: ii vv v d avg out in out in () ? = where i out is the maximum output load current pro- grammed by the i lim resistor. peak reverse voltage is equal to the regulator input voltage. use a schottky diode with a reverse voltage rating greater than the input voltage. the overvoltage protection feature in the lt3663 keeps the switch off when v in > 39v (typical) allowing the use of a 45v rated schottky even when v in ranges up to 60v. input capacitor bypass the input of the lt3663 circuit with a 1f or higher value ceramic capacitor of x7r or x5r type. y5v types have poor performance over temperature and applied volt- age and are not recommended. if the input power source has high impedance, or there is signi? cant inductance due to long wires or cables, additional bulk capacitance may be necessary. this can be provided with a low per- formance electrolytic capacitor. step-down regulators draw current from the input supply in pulses with very fast rise and fall times. the input capacitor is required to reduce the resulting voltage ripple at the lt3663 and to force this very high frequency switching current into a tight local loop, minimizing emi. place the capacitor in close proximity to the lt3663 and the catch diode; (see the pcb layout section). output capacitor a 10f or greater ceramic capacitor is recommended to provide low output ripple and good transient response. ceramic capacitors have very low equivalent series re- sistance (esr) and provide the best ripple performance. use x5r or x7r types and keep in mind that a ceramic capacitor biased with v out has less than its speci? ed nominal capacitance. high performance electrolytic capacitors can be used for the output capacitor. low esr is important, so choose one that is intended for use in switching regulators. keep the esr less than 0.1. i lim resistor the lt3663 output current limit controls the maximum current delivered from the lt3663 regulator. this allows tighter control of the system power dissipation and also protects the inductor and diode from overheating during an overload or short circuit condition. a resistor con- nected from i lim pin to gnd programs the output current. table 1 details the i lim resistor values for speci? c output current limits. table 1. output current limit vs r lim value output current limit (a) r ilim value (k) 0.4 140 0.6 75 0.8 48.7 1.0 36.5 1.2 28.7 there may be a reason in some applications to move the output current limit. the following simple circuit demon- strates how the output current limit can be adjusted: figure 3. circuit for multiple values of output current limit lt3663 on, r ilim = ra off, r ilim = ra + rb i lim 3663 f03 ra rb
lt3663 10 3663fb applications information boost and bias pin considerations capacitor c3 and the internal boost diode (see the block diagram) are used to generate a boost voltage that is higher than the input voltage. in most cases a 0.1f capacitor works well. figure 4 shows three ways to arrange the boost circuit. the boost pin must be more than 2.3v above the sw pin for best ef? ciency. for outputs of 3v and above, the standard circuit (figure 4a) is best. for outputs between 2.8v and 3v, use a 1f boost capacitor. a 2.5v output presents a special case because it is marginally adequate to support the boosted drive stage while using the internal boost diode. for reliable boost pin operation with 2.5v outputs use a good external schottky diode (such as the on semi, mbr0540) and a 1f boost capacitor (see figure 4 b). f o r l o w e r o u t p u t v o l t a g e s c o n n e c t a n e x t e r n a l s c h o t t k y diode to the input (figure 4c), or to another supply greater than 2.8v. using v in reduces the maximum input voltage to 25v. the circuit in figure 4a is more ef? cient because the boost pin current comes from a lower voltage source. take care to ensure that the maximum voltage ratings of the boost pin is not exceeded. figure 4. three circuits to generate boost pin voltage lt3663 (4c) for v out < 2.5v; v in(max) = 25v v in v in 3663 f04 boost sw d3 c3 i sense v out v out lt3663 (4b) for 2.5v < v out < 2.8v v in v in boost sw d3 c3 i sense v out v out lt3663 (4a) for v out > 2.8v v in v in boost sw c3 i sense v out v out
lt3663 11 3663fb applications information pcb layout proper operation and minimum emi, requires careful printed circuit board layout. figure 5 shows the recom- mended component placement with trace, ground plane and via locations. note that large, switched currents ? ow in the lt3663s v in and sw pins, the catch diode (d2) and the input capacitor (c1). keep the loop formed by these components as small as possible and tied to system ground in only one place. locate these components, along with the inductor and output capacitor, on the same side of the circuit board, and keep their connections on that layer. place a local, unbroken ground plane below these components, and tie this ground plane to system ground at one location, ideally at the ground terminal of the output capacitor c1. make the sw and boost pcb trace as short as possible. include vias near the exposed gnd pad of the lt3663 to help remove heat from the lt3663 to the ground plane. high temperature considerations the die temperature of the lt3663 must not exceed the maximum rating. this is generally not a concern unless the ambient temperature is above 85c. for higher tem- peratures, take care in the layout of the circuit to ensure good heat sinking of the lt3663. de-rate the maximum load current as the ambient temperature approaches the maximum temperature rating. calculate the die tempera- ture by multiplying the lt3663 power dissipation by the thermal resistance from junction to ambient. estimate the power dissipation within the lt3663 by calculating the total power loss from an ef? ciency measurement and subtracting the catch diode loss. thermal resistance depends on the layout of the circuit board, but 64c/w is typical for the (2mm 3mm) dfn (dcb) package. other linear technology publications application notes 19, 35 and 44 contain more detailed descriptions and design information for buck regulators and other switching regulators. the lt1376 data sheet has a more extensive discussion of output ripple, loop compensation and stability testing. design note 100 shows how to generate a bipolar output supply using a buck regulator. 3663 f05 v in run r ilim c2 v out gnd l d1 c3 c1 r2 r1 3 4 2 1 6 5 7 8 lt3663 figure 5. lt3663 pcb layout
lt3663 12 3663fb typical applications 2.5v step-down converter 1.2v step-down converter 5v step-down converter 3663 ta02 lt3663 v in v in 7.5v to 36v transient to 60v run i lim boost sw gnd c3 0.1f c1 4.7f d1: diodes inc, dfls260 l: tdk, vlcf5020t-6r8n1r3-1 c2 22f r1 59k r ilim 28.7k r2 11k l 6.8h d1 i sense v out v out 5v 1.2a fb on off 3663 ta04 lt3663 v in v in 7.5v to 36v transient to 60v run i lim boost sw gnd c3 1f c1 4.7f d1: diodes inc, dfls260 d3: on semi, mbr0560 l: tdk, vlcf5020t-3r3n2r0-1 c2 22f r1 210k r ilim 28.7k r2 100k l 3.3h d1 i sense v out v out 2.5v 1.2a d3 fb on off 3663 ta05 lt3663 v in v in 7.5v to 23v run i lim boost sw gnd c3 0.22f c1 4.7f d1: diodes inc, dfls240 d3: on semi, mbr0540 l: tdk, vlcf5020t-3r3n2r0-1 c2 22f r1 49.9k r ilim 28.7k r2 100k l 3.3h d1 i sense v out v out 1.2v 1.2a d3 fb on off ? ? 3663 ta07 lt3663-5 v in run i lim sw boost gnd c2 0.1f 16v c1 2.2f 50v 1206 c3 47f 1206 10v 20% l16-0017 bh electronics 1761es5-3.3 r1 10k d1 dfls260 60v 2a i sense v out c5 2.2f 0603 10v t1 4 2 3 1 10h 10h 1 2 34 5 d2 13 2 r3 100 0805 c4 47pf 50v 0603 cmpsh-3e sot-23 v outs r2 100k note: 60v max transient voltage r ilim 75k v in 7.5v to 36v hvbuck 5v 600ma in gnd shdn out byp c6 0.01f 10v 0403 c7 10f 6.3v 0603 3.3v 50ma rtn lt3663-5 5v step-down regulator with isolated 3.3v output
lt3663 13 3663fb package description 3.00 0.10 (2 sides) 2.00 0.10 (2 sides) note: 1. drawing is not a jedec package outline 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 0.75 0.05 r = 0.115 typ r = 0.05 typ 1.35 ref 1 4 8 5 pin 1 bar top mark (see note 6) 0.200 ref 0.00 ? 0.05 (dcb8) dfn 0106 rev a 0.23 0.05 0.45 bsc pin 1 notch r = 0.20 or 0.25 45 chamfer 0.25 0.05 1.35 ref recommended solder pad pitch and dimensions apply solder mask to areas that are not soldered 2.10 0.05 0.70 0.05 3.50 0.05 package outline 0.45 bsc 1.35 0.10 1.35 0.05 1.65 0.10 1.65 0.05 dcb package 8-lead plastic dfn (2mm 3mm) (reference ltc dwg # 05-08-1718 rev a)
lt3663 14 3663fb ms8e package 8-lead plastic msop , exposed die pad (reference ltc dwg # 05-08-1662 rev e) msop (ms8e) 0908 rev e 0.53 p 0.152 (.021 p .006) seating plane 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 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 C 0.38 (.009 C .015) typ 0.86 (.034) ref 0.65 (.0256) bsc 0 o C 6 o typ detail a detail a gauge plane 12 3 4 4.90 p 0.152 (.193 p .006) 8 8 1 bottom view of exposed pad option 7 6 5 3.00 p 0.102 (.118 p .004) (note 3) 3.00 p 0.102 (.118 p .004) (note 4) 0.52 (.0205) ref 1.83 p 0.102 (.072 p .004) 2.06 p 0.102 (.081 p .004) 5.23 (.206) min 3.20 C 3.45 (.126 C .136) 2.083 p 0.102 (.082 p .004) 2.794 p 0.102 (.110 p .004) 0.889 p 0.127 (.035 p .005) recommended solder pad layout 0.42 p 0.038 (.0165 p .0015) typ 0.65 (.0256) bsc 0.1016 p 0.0508 (.004 p .002) detail b detail b corner tail is part of the leadframe feature. for reference only no measurement purpose 0.05 ref 0.29 ref
lt3663 15 3663fb information furnished by linear technology corpor ation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- t i o n t h a t t h e i n t e r c o n n e c t i o n o f i t s c i r c u i t s a s d e s c r i b e d h e r e i n w i l l n o t i n f r i n g e o n e x i s t i n g p a t e n t r i g h t s . revision history rev date description page number b 11/09 additions to features text changes to description addition of mse package to pin con? guration additions made to order information changes to electrical characteristics expanded temperature range of typical performance curves addition of note to functional block diagram text changes to applications information addition of typical applications drawing addition of ms8e package drawing 1 1 2 2, 3 3 4, 5 6 8, 11 12 14 (revision history begins at rev b)
lt3663 16 3663fb linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com ? linear technology corporation 2009 lt 1109 rev b ? printed in usa related parts typical application 3.3v step-down converter 3663 ta03 lt3663 v in v in 7.5v to 36v run i lim boost sw gnd c3 0.1f c1 4.7f d1: diodes inc, dfls240 l: tdk, vlcf5020t-4r7n1r7-1 c2 22f r1 316k r ilim 28.7k r2 100k l 4.7h d1 i sense v out v out 3.3v 1.2a fb on off ef? ciency output current (a) 0.1 efficiency (%) 100 90 80 70 60 50 30 40 0.5 0.9 0.3 0.7 1.1 3663 ta06 1.3 v in = 15v v in = 8v v in = 30v part number description comments lt1766 60v, 1.2a (i out ), 200khz, high ef? ciency step-down dc/dc converter v in : 5.5v to 60v, v outmax = 1.20v, i q = 2.5ma, i sd = 25a, tssop16/tssop16e packages lt1933 500ma(i out ), 500khz step-down switching regulator in sot-23 v in : 3.6v to 36v, v outmax = 1.2v, i q = 1.6ma, i sd <1a, thinsot package lt1936 36v, 1.4a(i out ) , 500khz high ef? ciency step-down dc/dc converter v in : 3.6v to 36v, v outmax = 1.2v, i q = 1.9ma, i sd <1a, ms8e package lt1940 dual 25v, 1.4a (i out ), 1.1mhz, high ef? ciency step-down dc/dc converter v in : 3.6v to 25v, v outmax = 1.20v, i q = 3.8ma, i sd <30a, tssop16e package lt1976/lt1977 60v, 1.2a (i out ), 200/500khz, high ef? ciency step-down dc/dc converter with burstmode ? operation v in : 3.3v to 60v, v outmax = 1.20v, i q = 100a, i sd <1a, tssop16e package ltc3407/ ltc3407-2 dual 600ma/800ma, 1.5/2.25 mhz syncronous step-down dc/dc converter v in : 2.5v to 5.5v, v outmax = 0.6v, i q = 40a, i sd <1a, 3mm 3mm dfn, ms10e packages lt3434/lt3435 60v, 2.4a (i out ), 200/500khz, high ef? ciency step-down dc/dc converter with burstmode operation v in : 3.3v to 60v, v outmax = 1.20v, i q = 100a, i sd <1a, tssop16e package lt3437 60v, 400ma (i out ),micropower step-down dc/dc converter with burstmode operation v in : 3.3v to 60v, v outmax = 1.25v, i q = 100a, i sd <1a, 3mm 3mm dfn, tssop16e packages lt3493 36v, 1.4a(i out ), 750khz high ef? ciency step-down dc/dc converter v in : 3.6v to 36v, v outmax = 0.8v, i q = 1.9ma, i sd <1a, 2mm 3mm dfn package lt3501 dual 25v, 3a (i out ), 1.5mhz, high ef? ciency step-down dc/dc converter v in : 3.3v to 25v, v outmax = 0.8v, i q = 3.7ma, i sd <10a, tssop-20e package lt3503 20v, 1a (i out ), 2.2mhz, high ef? ciency step-down dc/dc converter v in : 3.6v to 20v, v outmax = 0.78v, i q = 1.9ma, i sd <1a, 2mm 3mm dfn, package lt3505 36v, 1.2a (i out ), 3mhz, high ef? ciency step-down dc/dc converter v in : 3.6v to 36v, v outmax = 0.78v, i q = 2ma, i sd <2a, 3mm 3mm dfn, ms8e packages lt3506/a dual 25v, 1.6a (i out ), 575khz/1.1mhz, high ef? ciency step-down dc/dc converter v in : 3.6v to 25v, v outmax = 0.8v, i q = 3.8ma, i sd <30a, 4mm 5mm dfn package lt3508 dual 36v, 1.4a (i out ), 2.5mhz, high ef? ciency step-down dc/dc converter v in : 3.6v to 36v, v outmax = 0.8v, i q = 4.3ma, i sd <1a, 4mm 4mm qfn, tssop16e packages lt3510 dual 25v, 2a (i out ), 1.5mhz, high ef? ciency step-down dc/dc converter v in : 3.3v to 25v, v outmax = 0.8v, i q = 3.7ma, i sd <10a, tssop-20e package ltc3548 dual 400ma + 800ma, 2.25 mhz syncronous step-down dc/dc converter v in : 2.5v to 5.5v, v outmax = 0.6v, i q = 40a, i sd <1a, 3mm 3mm dfn, ms10e packages burstmode is a registered trademark of linear technology corporation.

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