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mp2 41 0 a 24v, 2a, 1mhz , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 1 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. description the mp2410 a is a 24v , monolithic , synchronous , step - down , white led driver with a built - in power mosfet and rectifier. it achieves up to 2a of continu ous output current with excellent load and line regulation. peak current mode operation provi des fast transient response and eases loop stabilization. the mp2410 a incorporates both analog and pwm dim ming onto a single control pin. the MP2410A implement s deep analog dimming and pwm dimming. full protection features include cycle - by - cycle peak - current limiting, output short - circuit protection (scp) , open le d protection , ntc thermal protection , and thermal shutdown. the MP2410A requires a minimum number of readily available , standard , external components and is available in tsot23 - 6 and tsot23 - 8 packages . features ? 4.2v to 24v wide input range ? synchronous step - down converter ? 100 m internal high - s ide power mosfet ? 80m internal low - s ide synchron ous rectifier ? peak current mode control ? up to 2a continu ous output current ? 100mv feedback voltage ? up to 97 % efficiency ? fixed 1mhz swi tching frequency ? analog and pwm dimming ? cycle - by - cycle current limit ? inherent led open protection ? output short - circuit protection (scp) ? ntc thermal protection ? thermal shutdown ? auto - restart function ? available i n tsot23 - 6 and tsot23 - 8 packages applications ? infrared led driver ? general led driver ? flashlight ? handheld computers backlight all mps parts are lead - free, halogen - free, and adhere to the rohs directive. for mps green status, please visit the mps w eb site under quality assurance. mps and the future of analog ic technology are registered trademarks of monolithic power systems, inc. typical application i n e n / d i m b s t s w f b g n d m p 2 4 1 0 a v i n o f f o n c 2 c 1 l 1 c 3 5 0 m r 2 r 1 m a x 2 a
mp2 410a C 24v, 2a, 1mhz, synchronous, step - down, led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 2 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number package top marking mp 2410 a gj * tsot23 - 6 see below mp 2410 a g je ** tsot23 - 8 * for tape & reel, add suffix C z (e.g. mp 2410 a gj C z) ** for tape & reel, add suffix C z (e.g. mp 2410 a g je C z) top marking (tsot23 - 6) a rx : product code of mp 2410 a gj y: year code top marking (tsot23 - 8) a rv : product code of mp 2410 a gj e y: year code package reference top view top view tsot23 - 6 tsot23 - 8
mp2 410a C 24v, 2a, 1mhz, synchronous, step - down, led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 3 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. absolute maximum ratings (1) supply voltage ( v in ) ................................ ..... 26v v sw ................................ ....... - 0.3v to v in + 0.3 v v bst ................................ ..................... v sw + 6 v all other p ins ................................ .. - 0.3v to +6 v continuous power dissipation (t a = 25 c) (2) tsot23 - 6 ................................ ................ 1.25w tsot23 - 8 ................................ ................ 1.25w junction temperature ............................... 150 c lead temperature ................................ .... 260 c storage temperatur e ................ - 65 c to + 150 c esd capability human body mode ............ 2.0kv recommended operating conditions ( 3 ) supply voltage ( v in ) ........................ 4.2 v to 24 v operating junction temp . (t j ) .. - 40 c to 125 c thermal resistance ( 4 ) ja jc tsot23 - 6 .............................. 100 ..... 55 ... c/w tsot23 - 8 .............................. 100 ..... 55 ... c/w notes : 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), t he junction - to - ambient thermal resistance ja , an d the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max) - t a )/ ja . exceeding the maximum allowable power dissipation produces an excessive die temperature, causing the regulator to go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51 - 7, 4 - layer pcb.
mp2 410a C 24v, 2a, 1mhz, synchronous, step - down, led driver preliminary specific ations subject to ch ange mp2 410 a rev. 1 .0 www.monolithicpower.com 4 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical character istics typical values are v in = 12 v, t j = 25 c , unless otherwise noted. minimum and maximum values are at v in = 12 v , t j = - 40 c to + 1 25 c, unless otherwise noted , guaranteed b y characterization. parameters symbol condition min typ max units supply v oltage operating range v in after turn on 4.2 24 v turn on threshold v in_on v in rising edge 3.5 3.7 4 v hysteretic voltage v in_ hys 0. 12 v supply current shutd own current i s d v en = 0v 10 50 a quiescent current i q v en = 2v, v fb = 200m v 0. 9 1. 1 ma enable and dimming (en/dim) en /dim off threshold v en_off v en/dim falling edge 0. 27 0. 3 1 0.3 5 v en /dim on threshold v en_on v en/dim rising edge 0. 5 4 5 0. 59 0.63 5 v turn off delay time t off_delay 16 22 28 ms en/dim pull - up current i en/dim v en = 0v 2.8 3.8 5.3 a max analog dimming threshold v adim_max theoretically, v fb = 100mv 1. 31 1. 44 1. 57 v min analog dimming threshold v adim_min v fb = 5mv 0. 63 0. 7 0. 78 v feedback (fb) feedback voltage v fb 4.2 v ? v in ? 24v 93 100 107 mv feedback current i fb v fb = 150mv 30 7 5 na power switch high - side mosfet on resistance r ds(on)_h v in = 5.0 v 100 170 m v in = 4.2 v 110 180 m low - side sync hronous rectifier switch on resistance r ds(on)_l v in = 5.0 v 80 140 m v in = 4.2 v 90 150 m switch leakage i sw_lkg v en = 0v, v sw = 0v 1 a high - side current limit i limit_h when h igh - side switch turn s on 3.5 5 6.6 a low - side current limit i limit_l when low - side switch turn s on - 890 - 6 3 0 - 3 3 0 ma ocp current threshold i ocp both for high side and low side 3. 6 5.5 7 a oscillator frequency f sw v fb = 80 m v 0.8 1 1. 2 mhz maximum duty cycle d max v fb = 80m v 90 94 % minimum on time t on _min 70 ns restart timer hiccup timer at fault condition t start 2.4 ms bootstr ap bias voltage for high - side driver v bst - v sw 5.5 v v in 24v 4.8 5. 1 5.5 v v in = 4.2v 3.6 v ntc high - threshold voltage v h_ntc v fb = 95mv 1.16 1.25 1.34 v low - threshold vo ltage v l_ntc v fb = 5mv 0.76 0.82 0.88 v shutdown threshold v sd_ntc v ntc falling edge 0. 34 0.41 0.47 v shutdown voltage hyster esis v sd_ntc_ hys 55 110 185 mv pull - up current source i pull_up_ntc 41 58 72 a leakage current i ntc_ lkg 1 a thermal shutdown thermal shutdown threshold ( 5 ) t sd 150 c thermal shutdown hysteresis ( 5 ) t hys 6 0 c note : 5) guaranteed by character ization.
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 5 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 6 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performace c haracteristics (conti nued) performance waveforms are tested on the evaluation board. v in = 12v , 2 w leds in series, v out = 5. 9 v, i led = 1.5 a, l = 4.7 h, t a = 25c, unless otherwise noted.
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 7 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performace c haracteristics (continued) performance waveforms are tested on th e evaluation board. v in = 12v, 2 wleds in series, v out = 5.9v, i led = 1.5a, l = 4.7 h, t a = 25c, unless otherwise noted.
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 8 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performace c haracteristics (continued) performance waveforms are tested on the evaluation board. v in = 12v, 2 wleds in series, v out = 5.9v, i led = 1.5a, l = 4.7 h, t a = 25c, unless otherwise noted.
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 9 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. pin functions pin # name description tsot23 - 6 tsot23 - 8 1 5 gnd ground. gnd is the voltage reference for the regulated output voltage. give careful consideration to gnd during layout . 2 6 sw switch output . 3 7 v in supply voltage . the mp 2410 a operates on a 4.2 v to 24v , unregulated input. an input capacitor is needed to prevent large voltage s pikes from appearing at the input. 4 2 fb current sense feedback voltage . fbs internal reference voltage is 0.1v. 5 3 en /dim on/ off control input and dimming command input . leav ing en/dim floating or applying a voltage higher than 0.59 v on en/dim turns on the MP2410A . for analog dimming, w hen the en/dim voltage rises up from 0. 7v to 1. 44v , the output current change s from its min value to the full - scale led current . for pwm dimming, app ly a 100hz to 2khz pwm signal with an amplitude higher than 1.5v to en/dim . 6 4 bst bootstrap. connect a capacitor between sw and bs t to form a floating supply across the power switch driver. this capacitor is needed to drive the power switchs gate above the supply voltage. - 1 ntc led temperature protection . connect an ntc resistor from ntc to gnd to reduce the outpu t current to protect the led when the ambient temperature rises up at high level s . - 8 n c no connection .
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 10 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. block diagram figure 1: functional block diagram e n / d i m n t c v i n b s t s w f a u l t d e t e c t i o n f b g n d i n p u t p o w e r s u p p l y 5 0 k 4 0 p f 2 p f
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 11 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the mp2410 a is a high - frequency , syn chron ous , rectified , step - down , switch ing mode led driver with a built - in , internal power mosfet and synchronous rectifier switch. the MP2410A offers a very high - performance solution that achieve s up to 2a of continuous output led current with excellent load and line regulation over a wide input supply range . the mp2410 a operates in a fixed 1mhz frequency, and uses peak current control mode to regulate the output current . a new switching cycle is initiated b y the internal clock at the beginning of every switching cycle . the integrated high - side power mosfet is turned on , and the inductor current rises linearly to provide energy to the load. the high - side power mosfet remains on until its current rea ches the value of the comp level , which is the output of the internal error amplifier . the output voltage of the error amplifier depends on the difference of the output feedback and the internal , high - precision reference . t he high - side power switch remains off until the next clock cycle begins . after the high - side switch turns off, the low - side sync switch turns on , and the inductor current flows through the low - side sw itch. to prevent a shoot - through , a dead time is implemented to prevent the high - side and low - side fets from turn ing on at the same time. when the duty cycle of one switching perio d reaches 9 4 %, the current in the high - side power mosfet can not reach the comp - set current value, and the high - side power mosfet is forced to turn off. under - voltage lockout (uvlo) and ic start - u p / shutdown procedure under - voltage lockout (uvlo) i s implemented to prevent the chip from operating at an insufficient supply voltage. the mp 2410 a uvlo comparator monitors the output voltage of the internal regulator , which is supplied from v in . if both v in and en /dim are higher than their appropria te thresholds, the chip starts up . the reference block starts first to generat e stable reference voltage s and currents . the internal regulator is then enabled. the regulator provides a stable supply for the remaining circuitries . three events can shu t down the chip: en /dim low for l onger than t off_delay , v in drops below uvlo , and thermal shutdown. in the shutdown procedure, the signaling path is blocked first to prevent any fault triggering. the comp voltage (v comp ) and the inter nal su pply rail are then pulled down. error amplifier (ea) the internal , low , offset error amplifier compares the fb voltage with the internal 100mv reference and outputs a comp voltage, which is inside of the chip and is used to control the high - side mos fet peak current and regulate the output current. internal soft start (ss) a soft start (ss) is implemented to prevent the converter output current from overshooting during start - up. when the chip starts, the internal circuitry generates a soft - start voltage that ramp s up from 0v. the soft - start period lasts until the voltage on the soft - start capacitor exceeds the 0. 1 v reference voltage. at this point , the reference voltage takes over. floating driver and bootstrap charging the high - side , floating , power mosfet driver is powered by an external bootstrap capacitor. th e b ootstrap capacitor voltage is regulated internally. during normal operation, a 5 .1 v bootstrap voltage is maintain ed between bst and sw.
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 12 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. enable and dimming c ontrol (en/dim) en /dim is a control pin that turns the regulator on and off and dim s the output led current . leave en/dim floating or d rive it high to turn on the mp2410 a . after en/dim is pulled low for t off_delay ( 22ms , typical ly ), the mp241 0 a is turned off . figure 2 shows the control logic of en/dim . figure 2 : en/dim time sequence analog dimming apply a dc signal on en/dim to dim t he mp2410 a in analog dimming mode. when the voltage on en/dim i s lower than v adim_min , the led current is regulated to the minimal scale . when the voltage on en/dim is between v adim_min and v adim_max , the led current changes from the minimal scale to the full scale of the led current. if the voltage on en/dim is h igher than v adim_max , the maximum led current is regulated. figure 3 shows the analog dimming curve . due to the hysteretic of the en /dim on /off threshold , the chip remains at the minimal led current longer at the v en/dim f alling edge until v en/dim is lower than v en_off . the dimming curve is the same in the linear dimming range . figure 3 : analog dimming curve pwm dimming apply a pwm signal on en/dim to implement pwm dimming mode. the dim ming fre que ncy is recommended to be in the range of 100hz to 2khz to achieve good dimming linearity. the digital signals amplitude must be higher than 1.5v. open led if the led is open without a feedback signal, the mp2410 a works at the maximum duty cyc le , and the output voltage rises up close to the input voltage. every power component operates at a safe state. led short - circuit protection (scp) the mp2410 a integrates led short - circuit protection (scp) circuitry. there are several features protecting the mp2410 a from damage when an led short circuit occurs. the mp2410 a features a cycle - by - cycle current limit to restrict the maximum current of the inductor. a protection mechanism monitors the fb level though an internal r - c filter. onc e the fb level rises up to reach v fb_burst_al , the c hip stops switching until the fb level drops to a lower value , and t he system works in burst mode . in the worst - case scenario , the led is shorted to gnd . if the cycle - by - cy cle cu rrent - limit function can not clamp the current overshoot sufficiently , then the current through both the high - side and low - side fets is also monitored by the over - current detector inside the chip. if this current is higher than the short - circuit threshold (i ocp ), the mp2410 a treats this as a short - circuit condition. when an over - current condition or short - circuit condition is detected, the mp2410 a turns off both the high - side and low - side mosfets for 2.4 ms and restar t s . during this period, v comp is pulled down to ground, so the restart from the fault condition is also done with a soft start. e n / d i m i n t e r n a l e n a b l e t o f f _ d e l a y a d i m i l e d f u l l s c a l e v a d i m _ m i n v a d i m _ m a x 0 m i n s c a l e v e n _ o f f v e n _ o n
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 13 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. thermal protection ntc provides led thermal protection. a n ntc resistor used to monitor the ambient temperature can be connected to ntc directly. there is an internal current source flow ing out of ntc . the corresponding voltage is generated on the external ntc resistor and the led current changes (see figure 4 ) . figure 4 : ntc curve the ntc resistance value drops when the ambient temperature rises up. if the ntc voltage drops below v sd_ntc , the switching stops completely, and the led current drops to 0a , so the led lamp can be shut down by pulling ntc down . additionally , to protect against any lethal thermal damage, when the inner temperature exceeds the otp threshold , the mp2410 a shuts down the switching cycle with t hermal shutdown until the temperature drops to its lower threshold. thermal shutdown thermal shutdown is implemented to prevent the chip from operating at exceeding ly high temperature s . when the silicon die temperature is higher than 150c, otp sh uts down the entire chip. when the temperature is below its lower threshold ( typically 9 0c ) , the chip restart s . i l e d 0 v h _ n t c v l _ n t c v s d _ n t c v n t c f u l l s c a l e m i n s c a l e
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 14 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. application informat ion setting the led current a current sense resistor is inserted between the anode of led and gnd. the current sense resistor value can be calculated with equation (1) : (1) for a 2 a led current output , choose r s = 5 0m? . selecting the inductor a n inductor less than 100 h with a nominal dc current rating at least 25% higher than the maximum load current is recommended for most applications. for the highest efficien cy, the inductors dc resistance should be less than 1 00m?. for most designs, the required inductance value can be derived from equation (2): (2) where ? i l is the inductor ripple current. choose the inductor ripple current to be 30% of the maximum load current. the maximum inductor peak current can be calculated with equation (3) : (3) selecting the input capacitor the input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. the input capacitor impedance at the switching frequency should be less than the source impedance to prevent the high - frequency switching current from passing through the input. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, a 10 f capacitor is sufficient. selecting the output capacitor the output capacitor keeps the output current ripple small and ensures feedback loop stability. the output capacitor impedance should be low at the switching frequency. ceramic capacitors with x5r or x7r dielectrics are recommended for their low esr characteristics. for most applications, a 10 f ceramic capacitor is sufficient. pc b layout guidelines efficient pcb layout is critical for stable operation. for best results, refer to the guidelines below. 1. place the high current paths (gnd, v in , and sw) very close to the device with short, direct , and wide traces. 2. place the input capacitor as close to in and gnd as possible . 3. place the ext ernal feedback resistors next to fb . 4. keep the switch node traces short and away from the feedback network . for more information, please refer to the related evaluation board datasheet . s led 0.1v r i ? out in out in l sw v (v v ) l v i f ?? ? ? ? ? l l(max) led i ii 2 ? ??
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 15 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical ap plication circuit figure 5 : typical buck converter application , v in = 8v to 24 v, v o = 5. 9 v, i led = 1.5 a 4 . 7 h l 1 d s 8 4 l c b - b 1 1 3 4 a s - 4 r 7 n 1 0 n f / 5 0 v c 3 1 e n / d i m t p 2 4 . 7 f / 3 5 v c 1 1 2 0 6 n c r 5 2 0 k r 6 0 r 3 1 0 f / 3 5 v c 2 1 2 1 0 1 k r 4 0 . 1 / 1 % r 1 1 2 0 6 0 . 2 / 1 % r 2 1 2 0 6 1 v i n t p 1 1 g n d t p 3 1 l e d + t p 4 1 l e d - t p 5 n / c 8 v i n 7 s w 6 g n d 5 b s t 4 e n / d i m 3 f b 2 n t c 1 u 1 m p 2 4 1 0 a 2 . 2 n f / 5 0 v c 4 n t c 1
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver mp2 410 a rev. 1 .0 www.monolithicpower.com 16 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information tsot23 - 6 f r o n t v i e w n o t e : 1 ) a l l d i m e n s i o n s a r e i n m i l l i m e t e r s . 2 ) p a c k a g e l e n g t h d o e s n o t i n c l u d e m o l d f l a s h , p r o t r u s i o n o r g a t e b u r r . 3 ) p a c k a g e w i d t h d o e s n o t i n c l u d e i n t e r l e a d f l a s h o r p r o t r u s i o n . 4 ) l e a d c o p l a n a r i t y ( b o t t o m o f l e a d s a f t e r f o r m i n g ) s h a l l b e 0 . 1 0 m i l l i m e t e r s m a x . 5 ) d r a w i n g c o n f o r m s t o j e d e c m o - 1 9 3 , v a r i a t i o n a b . 6 ) d r a w i n g i s n o t t o s c a l e . 7 ) p i n 1 i s l o w e r l e f t p i n w h e n r e a d i n g t o p m a r k f r o m l e f t t o r i g h t ( s e e e x a m p l e t o p m a r k ) . t o p v i e w r e c o m m e n d e d l a n d p a t t e r n s e a t i n g p l a n e s i d e v i e w d e t a i l " a " s e e d e t a i l ' ' a ' ' i a a a a p i n 1 i d s e e n o t e 7 e x a m p l e t o p m a r k
mp2 410 a C 24v, 2a, 1mh z , synchronous , step - down , led driver notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp2 410 a rev. 1 .0 www.monolithicpower.com 17 4/25/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information ( continued ) tso t23 - 8 front view note : 1 ) all dimensions are in millimeters . 2 ) package length does not include mold flash , protrusion or gate burr . 3 ) package width does not include interlead flash or protrusion . 4 ) lead coplanarity ( bottom of leads after forming ) shall be 0 . 10 millimeters max . 5 ) jedec reference is mo - 193 , variation ba . 6 ) drawing is not to scale . 7 ) pin 1 is lower left pin when reading top mark from left to right , ( see example top mark ) top view recommended land pattern seating plane side view detail '' a '' see detail '' a '' iaaaa pin 1 id see note 7 example top mark

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