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an important notice at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. production data. tlv61046a slvsd82a ? april 2017 ? revised april 2017 tlv61046a 28-v output voltage boost converter with power diode and isolation switch 1 1 features 1 ? input voltage range: 1.8 v to 5.5 v, down to 1.6 v after startup ? output voltage up to 28 v ? integrated power diode and isolation switch ? 980-ma (typical) switch current ? up to 85% efficiency at 3.6-v input and 12-v output ? 2.5% output voltage accuracy ? power save operation mode at light load ? internal 7-ms soft start time ? true disconnection between input and output during shutdown ? output short circuit protection ? output over-voltage protection ? thermal shutdown protection ? 3-mm 3-mm sot23-6 package 2 applications ? pmoled power supply ? lcd panel ? wearable devices ? portable medical equipment ? sensor power supply 3 description the tlv61046a is a highly integrated boost converter designed for applications such as pmoled panel, lcd bias supply and sensor module. the tlv61046a integrates a 30-v power switch, an input to output isolation switch, and a rectifier diode. it can output up to 28 v from input of a li+ battery or two alkaline batteries in series. the tlv61046a operates with a switching frequency at 1.0 mhz. this allows the use of small external components. the tlv61046a has an internal default 12-v output voltage setting by connecting the fb pin to the vin pin. thus it only needs three external components to get 12-v output voltage. the tlv61046a has typical 980-ma switch current limit. it has 7-ms built-in soft start time to reduce the inrush current. when the tlv61046a is in shutdown mode, the isolation switch disconnects the output from input to minimize the leakage current. the tlv61046a also implements output short circuit protection, output over-voltage protection and thermal shutdown. the tlv61046a is available in a 6-pin 3-mm x 3-mm sot23-6 package. device information (1) part number package body size (nom) tlv61046a sot23-6 (6) 2.9 mm x 1.6 mm (1) for all available packages, see the orderable addendum at the end of the data sheet. simplified schematic vin en sw vout fb gnd l1 r1 r2 off on c1 c2 1.8 v ~ 5.5 v 4.5 v ~ 28 v copyright ? 2017, texas instruments incorporated productfolder ordernow technical documents tools & software support &community
2 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated table of contents 1 features .................................................................. 1 2 applications ........................................................... 1 3 description ............................................................. 1 4 revision history ..................................................... 2 5 pin configuration and functions ......................... 3 6 specifications ......................................................... 4 6.1 absolute maximum ratings ...................................... 4 6.2 esd ratings ............................................................ 4 6.3 recommended operating conditions ....................... 4 6.4 thermal information .................................................. 4 6.5 electrical characteristics ........................................... 5 6.6 typical characteristics .............................................. 6 7 detailed description .............................................. 8 7.1 overview ................................................................... 8 7.2 functional block diagram ......................................... 8 7.3 feature description ................................................... 9 7.4 device functional modes .......................................... 9 8 application and implementation ........................ 11 8.1 application information ............................................ 11 8.2 typical application - 12-v output boost converter 11 8.3 system examples ................................................... 15 9 power supply recommendations ...................... 16 10 layout ................................................................... 17 10.1 layout guidelines ................................................. 17 10.2 layout example .................................................... 17 11 device and documentation support ................. 18 11.1 device support .................................................... 18 11.2 receiving notification of documentation updates 18 11.3 community resources .......................................... 18 11.4 trademarks ........................................................... 18 11.5 electrostatic discharge caution ............................ 18 11.6 glossary ................................................................ 18 12 mechanical, packaging, and orderable information ........................................................... 18 4 revision history changes from original (april 2017) to revision a page ? changed to production data .................................................................................................................................................. 1
3 tlv61046a www.ti.com slvsd82a ? april 2017 ? revised april 2017 product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 5 pin configuration and functions dbv package 6-pin sot23 top view pin functions pin type description name number sw 1 pwr the switch pin of the converter. it is connected to the drain of the internal power mosfet. gnd 2 pwr ground fb 3 i voltage feedback of adjustable output voltage. connected to the center tap of a resistor divider to program the output voltage. when it is connected to the vin pin, the output voltage is set to 12 v by an internal feedback. en 4 i enable logic input. logic high voltage enables the device. logic low voltage disables the device and turns it into shutdown mode. vout 5 pwr output of the boost converter vin 6 i ic power supply input sw fb gnd vin en vout
4 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated (1) stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions . exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) all voltage values are with respect to network ground terminal. 6 specifications 6.1 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) (1) min max unit voltage range at terminals (2) vin, en, fb ? 0.3 6 v sw, vout ? 0.3 32 v operating junction temperature range, t j ? 40 150 c storage temperature range, t stg ? 65 150 c (1) electrostatic discharge (esd) to measure device sensitivity and immunity to damage caused by assembly line electrostatic discharges in to the device. (2) jedec document jep155 states that 500-v hbm allows safe manufacturing with a standard esd control process. (3) jedec document jep157 states that 250-v cdm allows safe manufacturing with a standard esd control process. 6.2 esd ratings value unit v (esd) (1) electrostatic discharge human body model (hbm), per ansi/esda/jedec js-001, all pins (2) 2000 v charged device model (cdm), per jedec specification jesd22-c101, all pins (3) 500 v 6.3 recommended operating conditions over operating free-air temperature range (unless otherwise noted) min typ max unit v in input voltage range 1.8 5.5 v v out output voltage range 3.3 28 v l effective inductance range 2.2 0.7 10 22 1.3 h c in effective input capacitance range 0.22 1.0 f c out effective output capacitance range 0.22 1.0 10 f t j operating junction temperature ? 40 125 c (1) for more information about traditional and new thermal metrics, see the semiconductor and ic package thermal metrics application report. 6.4 thermal information thermal metric (1) tlv61046a unit dbv (sot23) 6 pins r ja junction-to-ambient thermal resistance 177.7 c/w r jc(top) junction-to-case (top) thermal resistance 120.6 r jb junction-to-board thermal resistance 33.2 jt junction-to-top characterization parameter 21.5 jb junction-to-board characterization parameter 32.6 r jc(bot) junction-to-case (bottom) thermal resistance n/a
5 tlv61046a www.ti.com slvsd82a ? april 2017 ? revised april 2017 product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 6.5 electrical characteristics t a = ? 40 c to 85 c, v in = 3.6 v and v out = 12 v. typical values are at t a = 25 c, unless otherwise noted. parameter test conditions min typ max unit power supply v in input voltage range 1.8 5.5 v v in_uvlo under voltage lockout threshold v in rising 1.75 1.8 v v in falling 1.55 1.6 v in_hys vin uvlo hysteresis 200 mv i q_vin quiescent current into vin pin ic enabled, no load, no switching, v in = 1.8 v to 5.5 v, v out = 12 v 110 200 a i sd shutdown current into vin pin ic disabled, v in = 1.8 v to 5.5 v, t a = 25 c 0.1 1.0 a output v out output voltage range 3.3 28 v v out_12v 12-v output voltage accuracy fb pin connected to vin pin, t j =0 c to 125 c 11.7 12.1 12.4 v v ref feedback voltage pwm mode, t a =25 c 0.783 0.795 0.807 v pwm mode, t j =-40 c to 125 c 0.775 0.795 0.815 v pfm mode, t a =25 c 0.803 v v ovp output overvoltage protection threshold 28 29.2 30.4 v v ovp_hys over voltage protection hysteresis 0.9 v i fb_lkg leakage current into fb pin t a = 25 c 200 na i sw_lkg leakage current into sw pin ic disabled, t a = 25 c 500 na power switch r ds(on) isolation mosfet on resistance v out = 12 v 850 m low-side mosfet on resistance v out = 12 v 450 f sw switching frequency v in = 3.6 v, v out = 12 v, pwm mode 850 1050 1250 khz t on_min minimal switch on time 150 250 ns i lim_sw peak switch current limit v in = 3.6 v, v out = 12 v 680 980 1250 ma v in = 2.4 v, v out = 3.3 v 20 ma i lim_chg pre-charge current v in = 3.6 v, v out = 0 v 30 50 ma t startup startup time v out from v in to 12 v, c out_effective = 2.2 f, i out = 0 a 2 5 ms logic interface v en_h en logic high threshold 1.2 v v en_l en logic low threshold 0.4 v protection t sd thermal shutdown threshold t j rising 150 c t sd_hys thermal shutdown hysteresis t j falling below t sd 20 c
6 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 6.6 typical characteristics v in = 3.6 v, v out = 12 v, t a = 25 c, unless otherwise noted. v out = 12 v figure 1. efficiency vs output current v in = 3.6 v figure 2. efficiency vs output current v in = 3.6 v, v out = 12 v, fb pin connected to vin pin, pwm mode figure 3. 12-v fixed output voltage vs temperature v in = 3.6 v, v out = 12 v, pwm mode figure 4. fb reference voltage vs temperature v in = 3.6 v, v out = 12 v, no switching figure 5. quiescent current into vin vs temperature v in = 1.8 v ~ 6 v, v out = 12 v, no switching figure 6. quiescent current into vin vs input voltage temperature ( q c) reference voltage (mv) -40 -20 0 20 40 60 80 100 120 780 785 790 795 800 805 810 d004 output current (a) efficiency (%) 0.0001 0.001 0.01 0.1 1 0 10 20 30 40 50 60 70 80 90 100 d001 vin = 1.8 v vin = 3 v vin = 3.6 v vin = 4.2 v output current (a) efficency (%) 0.0001 0.001 0.01 0.1 1 0 10 20 30 40 50 60 70 80 90 100 d002 vout = 5 v vout = 12 v vout = 24 v temperature ( q c) quiescent current ( p a) -40 -20 0 20 40 60 80 100 120 70 80 90 100 110 120 130 140 150 d005 input voltage (v) quiescent current ( p a) 1.8 2.4 3 3.6 4.2 4.8 5.4 6 70 80 90 100 110 120 130 140 150 d001 temperature ( q c) 12-v fixed output voltage (v) -40 -20 0 20 40 60 80 100 120 11.9 11.95 12 12.05 12.1 12.15 12.2 d003
7 tlv61046a www.ti.com slvsd82a ? april 2017 ? revised april 2017 product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated typical characteristics (continued) v in = 3.6 v, v out = 12 v, t a = 25 c, unless otherwise noted. v in = 3.6 v figure 7. shutdown current vs temperature v in = 3.6 v, v out = 12 v figure 8. current limit vs temperature v in = 1.8 v ~ 6 v, v out = 12 v figure 9. current limit vs input voltage input voltage (v) current limit (ma) 1.8 2.4 3 3.6 4.2 4.8 5.4 6 500 600 700 800 900 1000 1100 d009 temperature ( q c) shutdown current ( p a) -40 -20 0 20 40 60 80 0 0.05 0.1 0.15 0.2 0.25 0.3 d007 temperature ( q c) current limit (ma) -40 -20 0 20 40 60 80 100 120 500 600 700 800 900 1000 1100 d008
8 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 7 detailed description 7.1 overview the tlv61046a is a highly integrated boost converter designed for applications requiring high voltage and small solution size such as pmoled panel power supply and sensor module. the tlv61046a integrates a 30-v power switch, an input to output isolation switch and a rectifier diode. it can output up to 28 v from input of a li+ battery or two cell alkaline batteries in series. one common issue with conventional boost regulators is the conduction path from input to output even when the power switch is turned off. it creates three problems, which are inrush current during start-up, output leakage current during shutdown and excessive over load current. in the tlv61046a, the isolation switch is turned off under shutdown mode and over load conditions, thereby opening the current path. thus the tlv61046a can truely disconnect the load from the input voltage and minimize the leakage current during shutdown mode. the tlv61046a operates with a switching frequency at 1.0 mhz. this allows the use of small external components. the tlv61046a has an internal default 12-v output voltage setting by connecting the fb pin to the vin pin. thus it only needs three external components to get 12-v output voltage. the tlv61046a has typical 980-ma switch current limit. it has 7-ms built-in soft start time to minimize the inrush current. the tlv61046a also implements output short circuit protection, output over-voltage protection and thermal shutdown. 7.2 functional block diagram thermal shutdown uvlo gate driver pwm / pfm control soft start & current limit control 3 2 5 1 6 logic 4 vout ea vout vin sw en fb gnd vout vin gate driver ovp ref pre-charge & short circuit protection & on/off control en ref fb 1.2v copyright ? 2016, texas instruments incorporated
9 tlv61046a www.ti.com slvsd82a ? april 2017 ? revised april 2017 product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 7.3 feature description 7.3.1 under-voltage lockout an under-voltage lockout (uvlo) circuit stops the operation of the converter when the input voltage drops below the typical uvlo threshold of 1.55 v. a hysteresis of 200 mv is added so that the device cannot be enabled again until the input voltage goes up to 1.75 v. this function is implemented in order to prevent malfunctioning of the device when the input voltage is between 1.55 v and 1.75 v. 7.3.2 enable and disable when the input voltage is above maximal uvlo rising threshold of 1.8 v and the en pin is pulled high, the tlv61046a is enabled. when the en pin is pulled low, the tlv61046a goes into shutdown mode. the device stops switching and the isolation switch is turned off providing the isolation between input and output. in shutdown mode, less than 1- a input current is consumed. 7.3.3 soft start the tlv61046a begins soft start when the en pin is pulled high. at the beginning of the soft start period, the isolation fet is turned on slowly to charge the output capacitor with 30-ma current for about 2 ms. this is called the pre-charge phase. after the pre-charge phase, the tlv61046a starts switching. this is called switching soft start phase. an internal soft start circuit limits the peak inductor current according to the output voltage. when the output voltage is below 3 v, the peak inductor current is limited to 140 ma. along with the output voltage going up from 3 v to 5 v, the peak current limit is gradually increased to the normal value of 980 ma. the switching soft start phase is about 5 ms typically. the soft start funciton reduces the inrush current during startup. 7.3.4 over-voltage protection the tlv61046a has internal output over-voltage protection (ovp) function. when the output voltage exceeds the ovp threshold of 29.2 v, the device stops switching. once the output voltage falls 0.9 v below the ovp threshold, the device resumes operation again. 7.3.5 output short circuit protection the tlv61046a starts to limit the output current whenever the output voltage drops below 4 v. the lower output voltage, the smaller output current limit. when the vout pin is shorted to ground, the output current is limited to less than 200 ma. this function protects the device from being damaged when the output is shorted to ground. 7.3.6 thermal shutdown the tlv61046a goes into thermal shutdown once the junction temperature exceeds the thermal shutdown termperature threshold of 150 c typically. when the junction temperature drops below 130 c typically, the device starts operating again. 7.4 device functional modes the tlv61046a has two operation modes, pwm mode and power save mode. 7.4.1 pwm mode the tlv61046a uses a quasi-constant 1.0-mhz frequency pulse width modulation (pwm) at moderate to heavy load current. based on the input voltage to output votlage ratio, a circuit predicts the required off-time. at the beginning of the switching cycle, the nmos switching fet, shown in the functional block diagram, is turned on. the input voltage is applied across the inductor and the inductor current ramps up. in this phase, the output capacitor is discharged by the load current. when the inductor current hits the current threshold that is set by the output of the error amplifier, the pwm switch is turned off, and the power diode is forward-biased. the inductor transfers its stored energy to replenish the output capacitor and supply the load. when the off-time is expired, the next switching cycle starts again. the error amplifier compares the fb pin voltage with an internal reference votlage, and its output determines the inductor peak current. the tlv61046a has a built-in compensation circuit that can accommodate a wide range of input voltage, output voltage, inductor value and output capacitor value for stable operation.
10 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated device functional modes (continued) 7.4.2 power save mode the tlv61046a implements a power save mode with pulse frequency modulation (pfm) to improve efficiency at light load. when the load current decreases, the inductor peak current set by the output of the error amplifier declines to regulate the output voltage. when the inductor peak current hits the low limit of 200 ma, the output voltage will exceed the setting voltage as the load current decreases further. when the fb voltage hits the pfm reference voltage, the tlv61046a goes into the power save mode. in the power save mode, when the fb voltage rises and hits the pfm reference voltage, the device continues switching for several cycles because of the delay time of the internal comparator. then it stops switching. the load is supplied by the output capacitor and the output voltage declines. when the fb voltage falls below the pfm reference voltage, after the delay time of the comparator, the device starts switching again to ramp up the output voltage. figure 10. output voltage in pwm mode and pfm mode output voltage v out_nom 1.01 x v out_nom pfm mode at light load pwm mode at heavy load
11 tlv61046a www.ti.com slvsd82a ? april 2017 ? revised april 2017 product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 8 application and implementation note information in the following applications sections is not part of the ti component specification, and ti does not warrant its accuracy or completeness. ti ? s customers are responsible for determining suitability of components for their purposes. customers should validate and test their design implementation to confirm system functionality. 8.1 application information the tlv61046a is a boost dc-dc converter integrating a power switch, an input to output isolation switch and a rectifier diode. the device supports up to 28-v output with the input voltage range from 1.8 v to 5.5 v. the tlv61046a adopts the current-mode control with adaptive constant off-time. the switching frequency is quasi- constant at 1.0 mhz. the isolation switch disconnects the output from the input during shutdown to minimize leakage current. the following design procedure can be used to select component values for the tlv61046a. 8.2 typical application - 12-v output boost converter spacing figure 11. 12-v boost converter 8.2.1 design requirements table 1. design requirements parameters values input voltage 2.7 v ~ 4.2 v output voltage 12 v output current 50 ma output voltage ripple 50mv vin en sw vout fb gnd l1 4.7 f 1.0 f r1 r2 off on c1 c2 2.7 v ~ 4.2 v 10 h tlv61046a 71.5 k 1.0 m 12 v
12 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 8.2.2 detailed design procedure 8.2.2.1 programming the output voltage there are two ways to set the output voltage of the tlv61046a. when the fb pin is connected to the input voltage, the output voltage is fixed to 12 v. this function makes the tlv61046a only need three external components to minimize the solution size. the second way is to use an external resistor divider to set the desired output voltage. by selecting the external resistor divider r1 and r2, as shown in equation 1 , the output voltage is programmed to the desired value. when the output voltage is regulated, the typical voltage at the fb pin is v ref of 795 mv. where ? v out is the desired output voltage ? v ref is the internal reference voltage at the fb pin (1) for best accuracy, r2 should be kept smaller than 80 k to ensure the current flowing through r2 is at least 100 times larger than the fb pin leakage current. changing r2 towards a lower value increases the immunity against noise injection. changing the r2 towards a higher value reduces the quiescent current for achieving higher efficiency at low load currents. 8.2.2.2 inductor selection because the selection of the inductor affects steady state operation, transient behavior, and loop stability, the inductor is the most important component in power regulator design. there are three important inductor specifications, inductor value, saturation current, and dc resistance (dcr). the tlv61046a is designed to work with inductor values between 2.2 h and 22 h. follow equation 2 to equation 4 to calculate the inductor ? s peak current for the application. to calculate the peak current in the worst case, use the minimum input voltage, maximum output voltage, and maximum load current of the application. to have enough design margin, choose the inductor value with -30% tolerance, and a low power-conversion efficiency for the calculation. in a boost regulator, the inductor dc current can be calculated with equation 2 . where ? v out = output voltage ? i out = output current ? v in = input voltage ? = power conversion efficiency, use 80% for most applications (2) the inductor ripple current is calculated with the equation 3 for an asynchronous boost converter in continuous conduction mode (ccm). where ? i l(p-p) = inductor ripple current ? l = inductor value ? f sw = switching frequency ? v out = output voltage ? v in = input voltage (3) therefore, the inductor peak current is calculated with equation 4 . out ref v r1 1 r2 v u ? ? 1 in out in l(p p) sw out v v 0.8v v i l v 0.8v u ' u u f out out l(dc) in v i i v u u k
13 tlv61046a www.ti.com slvsd82a ? april 2017 ? revised april 2017 product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated (1) see third-party products disclaimer (4) normally, it is advisable to work with an inductor peak-to-peak current of less than 40% of the average inductor current for maximum output current. a smaller ripple from a larger valued inductor reduces the magnetic hysteresis losses in the inductor, and emi. but in the same way, load transient response time is increased. because the tlv61046a is for relatively small output current application, the inductor peak-to-peak current could be as high as 200% of the average current with a small inductor value, which means the tlv61046a always works in dcm mode. table 2 lists the recommended inductors for the tlv61046a. table 2. recommended inductors for the tlv61046a part number l( h) dcr max (m ) saturation current (a) size (lxwxh) vendor (1) fdsd0420-h-100m 10 200 2.5 4.2x4.2x2.0 toko cdrh3d23/hp 10 198 1.02 4.0x4.0x2.5 sumida 74438336100 10 322 2.35 3.2x3.2x2.0 wurth vls4012-4r7m 4.7 132 1.1 4.0x4.0x1.2 tdk 8.2.2.3 input and output capacitor selection the output capacitor is mainly selected to meet the requirements for output ripple and loop stability. this ripple voltage is related to the capacitor ? s capacitance and its equivalent series resistance (esr). assuming a ceramic capacitor with zero esr, the minimum capacitance needed for a given ripple can be calculated by: where ? d max = maximum switching duty cycle ? v ripple = peak to peak output voltage ripple (5) the esr impact on the output ripple must be considered if tantalum or aluminum electrolytic capacitors are used. care must be taken when evaluating a ceramic capacitor ? s derating under dc bias, aging, and ac signal. for example, the dc bias can significantly reduce capacitance. a ceramic capacitor can lose more than 50% of its capacitance at its rated voltage. therefore, always leave margin on the voltage rating to ensure adequate capacitance at the required output voltage. it is recommended to use the output capacitor with effective capacitance in the range of 0.47 f to 10 f. the output capacitor affects loop stability of the boost regulator. if the output capacitor is below the range, the boost regulator can potentially become unstable. increasing the output capacitor makes the output voltage ripple smaller in pwm mode. for input capacitor, a ceramic capacitor with more than 1.0 f is enough for most applications. out max out sw ripple i d c v u u f l p p l p l dc i i i 2 '
14 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 8.2.3 application performance curves v in = 3.6 v, v out = 12 v, i out = 50 ma figure 12. switching waveforms in pwm ccm mode v in = 3.6 v, v out = 12 v, i out = 18 ma figure 13. switching waveforms in pwm dcm mode v in = 3.6 v, v out = 12 v, i out = 3 ma figure 14. switching waveforms in power save mode v in = 3.6 v, v out = 12 v, i out = 50 ma figure 15. soft startup waveforms v in = 3.6 v, v out = 12 v, i out = 50 ma figure 16. shutdown waveforms v in = 3.6 v, v out = 12 v figure 17. 30-ma to 70-ma load transient response en 1 v / div vout (ac) 3 v / div inductor current 100 ma / div vout (ac) 200 mv / div output current 50 ma / div sw 10 v / div vout (ac) 50 mv / div inductor current 100 ma / div en 1 v / div vout 3 v / div inductor current 100 ma / div sw 10 v / div vout (ac) 30 mv / div inductor current 100 ma / div sw 10 v / div vout (ac) 10 mv / div inductor current 100 ma / div
15 tlv61046a www.ti.com slvsd82a ? april 2017 ? revised april 2017 product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated v out = 12 v, i out = 50 ma figure 18. input voltage from 3.3-v to 4.2-v line transient response 8.3 system examples 8.3.1 fixed 12-v output voltage with three external components the tlv61046a can output fixed 12-v voltage by connecting the fb pin to the vin pin to save the external resistor divider. the figure 19 shows the application circuit. figure 19. fixed 12-v output voltage by connecting the fb pin to vin pin vin en sw vout gnd fb l1 10 p f 2.2 p f off on c1 c2 1.8 v ~ 5.5 v 12 v 10 p h copyright ? 2017, texas instruments incorporated vout (ac) 200 mv / div vin (3.3 v offset) 500 mv / div
16 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 9 power supply recommendations the device is designed to operate from an input voltage supply range between 1.8 v to 5.5 v. this input supply must be well regulated. if the input supply is located more than a few inches from the converter, additional bulk capacitance may be required in addition to the ceramic bypass capacitors. a typical choice is an electrolytic or tantalum capacitor with a value of 47 f. the input power supply ? s output current needs to be rated according to the supply voltage, output voltage and output current of the tlv61046a.
17 tlv61046a www.ti.com slvsd82a ? april 2017 ? revised april 2017 product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 10 layout 10.1 layout guidelines as for all switching power supplies, especially those running at high switching frequency and high currents, layout is an important design step. if the layout is not carefully done, the regulator could suffer from instability and noise problems. to maximize efficiency, switch rise and fall time are very fast. to prevent radiation of high frequency noise (for example, emi), proper layout of the high-frequency switching path is essential. minimize the length and area of all traces connected to the sw pin, and always use a ground plane under the switching regulator to minimize interplane coupling. the input capacitor needs not only to be close to the vin pin, but also to the gnd pin in order to reduce input supply ripple. the most critical current path for all boost converters is from the switching fet, through the rectifier diode, then the output capacitors, and back to ground of the switching fet. this high current path contains nanosecond rise and fall time and should be kept as short as possible. therefore, the output capacitors need not only to be close to the vout pin, but also to the gnd pin to reduce the overshoot at the sw pin and vout pin. 10.2 layout example a large ground plane on the bottom layer connects the ground pins of the components on the top layer through vias. figure 20. pcb layout example vout vin gnd gnd sw fb gnd vin en vout
18 tlv61046a slvsd82a ? april 2017 ? revised april 2017 www.ti.com product folder links: tlv61046a submit documentation feedback copyright ? 2017, texas instruments incorporated 11 device and documentation support 11.1 device support 11.1.1 third-party products disclaimer ti's publication of information regarding third-party products or services does not constitute an endorsement regarding the suitability of such products or services or a warranty, representation or endorsement of such products or services, either alone or in combination with any ti product or service. 11.2 receiving notification of documentation updates to receive notification of documentation updates, navigate to the device product folder on ti.com. in the upper right corner, click on alert me to register and receive a weekly digest of any product information that has changed. for change details, review the revision history included in any revised document. 11.3 community resources the following links connect to ti community resources. linked contents are provided "as is" by the respective contributors. they do not constitute ti specifications and do not necessarily reflect ti's views; see ti's terms of use . ti e2e ? online community ti's engineer-to-engineer (e2e) community. created to foster collaboration among engineers. at e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. design support ti's design support quickly find helpful e2e forums along with design support tools and contact information for technical support. 11.4 trademarks e2e is a trademark of texas instruments. all other trademarks are the property of their respective owners. 11.5 electrostatic discharge caution this integrated circuit can be damaged by esd. texas instruments recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 11.6 glossary slyz022 ? ti glossary . this glossary lists and explains terms, acronyms, and definitions. 12 mechanical, packaging, and orderable information the following pages include mechanical, packaging, and orderable information. this information is the most current data available for the designated devices. this data is subject to change without notice and revision of this document. for browser-based versions of this data sheet, refer to the left-hand navigation.
package option addendum www.ti.com 5-may-2017 addendum-page 1 packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish (6) msl peak temp (3) op temp (c) device marking (4/5) samples TLV61046ADBVR active sot-23 dbv 6 3000 green (rohs & no sb/br) cu nipdau level-1-260c-unlim -40 to 125 1c4f tlv61046adbvt active sot-23 dbv 6 250 green (rohs & no sb/br) cu nipdau level-1-260c-unlim -40 to 125 1c4f (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) rohs: ti defines "rohs" to mean semiconductor products that are compliant with the current eu rohs requirements for all 10 rohs substances, including the requirement that rohs substance do not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, "rohs" products are suitable for use in specified lead-free processes. ti may reference these types of products as "pb-free". rohs exempt: ti defines "rohs exempt" to mean products that contain lead but are compliant with eu rohs pursuant to a specific eu rohs exemption. green: ti defines "green" to mean the content of chlorine (cl) and bromine (br) based flame retardants meet js709b low halogen requirements of <=1000ppm threshold. antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) msl, peak temp. - the moisture sensitivity level rating according to the jedec industry standard classifications, and peak solder temperature. (4) there may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) multiple device markings will be inside parentheses. only one device marking contained in parentheses and separated by a "~" will appear on a device. if a line is indented then it is a continuation of the previous line and the two combined represent the entire device marking for that device. (6) lead/ball finish - orderable devices may have multiple material finish options. finish options are separated by a vertical ruled line. lead/ball finish values may wrap to two lines if the finish value exceeds the maximum column width. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis.
package option addendum www.ti.com 5-may-2017 addendum-page 2
tape and reel information *all dimensions are nominal device package type package drawing pins spq reel diameter (mm) reel width w1 (mm) a0 (mm) b0 (mm) k0 (mm) p1 (mm) w (mm) pin1 quadrant TLV61046ADBVR sot-23 dbv 6 3000 180.0 8.4 3.2 3.2 1.4 4.0 8.0 q3 tlv61046adbvt sot-23 dbv 6 250 180.0 8.4 3.2 3.2 1.4 4.0 8.0 q3 package materials information www.ti.com 9-may-2017 pack materials-page 1
*all dimensions are nominal device package type package drawing pins spq length (mm) width (mm) height (mm) TLV61046ADBVR sot-23 dbv 6 3000 210.0 185.0 35.0 tlv61046adbvt sot-23 dbv 6 250 210.0 185.0 35.0 package materials information www.ti.com 9-may-2017 pack materials-page 2

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