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MP2410 24v, 2a, 1mhz, synchronous, step-down led driver MP2410 rev. 1.0 www.monolithicpower.com 1 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. the future of analog ic technology description the MP2410 is a 24v, monolithic, synchronous, step-down, white led driver with a built-in power mosfet and rectifier. it achieves up to 2a of continuous output current with excellent load and line regulation. peak current mode operation provides fast transient response and eases loop stabilization. the MP2410 implements deep analog dimming. full protection features include cycle-by-cycle peak-current limiting, output short-circuit protection (scp), open led protection, ntc thermal protection, and thermal shutdown. the MP2410 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 ? 100m ? internal high-side power mosfet ? 80m ? internal low-side synchronous rectifier ? peak current mode control ? up to 2a continuous output current ? 100mv feedback voltage ? up to 97% efficiency ? fixed 1mhz switching frequency ? analog dimming ? cycle-by-cycle current limit ? inherent led open protection ? output short-circuit protection (scp) ? ntc thermal protection ? thermal shutdown ? auto-restart function ? available in tsot23-6 and tsot23-8 packages applications ? infrared led driver ? general led driver ? flashlight ? handheld computers backlight a ll mps parts are lead-free, halogen-free, and adhere to the rohs directive. fo r mps green status, please visit the mps website under qualit y a ssurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application in en/dim bst sw fb gnd MP2410 v in off on c2 c1 l1 c3 50m r2 r1 max 2a v in (v) 84 86 88 90 92 94 96 98 100 6 8 10 12 14 16 18 20 22 24 26
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver MP2410 rev. 1.0 www.monolithicpower.com 2 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number package top marking MP2410gj * tsot23-6 see below MP2410gje ** tsot23-8 * for tape & reel, add suffix ?z (e.g. MP2410gj?z) ** for tape & reel, add suffix ?z (e.g. MP2410gje?z) top marking (tsot23-6) alg: product code of MP2410gj y: year code top marking (tsot23-8) alx: product code of MP2410gje y: year code package reference top view top view 4 3 2 1 8 7 6 5 ntc fb en/dim bst nc vin sw gnd tsot23-6 tsot23-8
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver MP2410 rev. 1.0 www.monolithicpower.com 3 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. absolute maxi mum ratings (1) supply voltage (v in ) ..................................... 26v v sw ........................................ -0.3v to v in + 0.3v v bst ...................................................... v sw + 6v all other pins ................................... -0.3v to +6v continuous power dissipation (t a = 25c) (2) tsot23-6 ................................................ 1.25w tsot23-8 ................................................ 1.25w junction temperature ................................ 150c lead temperature ..................................... 260c storage temperature ................ -65c to +150c esd capability human body mode ............ 2.0kv recommended operating conditions (3) supply voltage (v in ) ......................... 4.2v to 24v operating junction temp. (t j ) .. ?-40c to 125c 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), the junction-to- ambient thermal resistance ja , and 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 powe r 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.
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 4 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics typical values are v in = 12v, t j = 25c, unless otherwise noted. minimum and maximum values are at v in = 12v, t j = -40c to +125c, unless otherwise noted, guaranteed by characterization. parameters symbol condition min typ max units supply voltage 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 shutdown current i sd v en = 0v 10 50 a quiescent current i q v en = 2v, v fb = 200mv 0.9 1.1 ma enable and dimming (en/dim) en/dim off threshold v en off v en/dim falling edge 0.27 0.31 0.35 v en/dim on threshold v en on v en/dim rising edge 0.545 0.59 0.635 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 4.2v ? ? power switch high-side mosfet on resistance r ds(on)_h v in = 5.0v 100 170 m ? v in = 4.2v 110 180 m ? low-side synchronous rectifier switch on resistance r ds(on)_l v in = 5.0v 80 140 m ? v in = 4.2v 90 150 m ? switch leakage i sw lkg v en = 0v, v sw = 0v 1 a high-side current limit i limit_h when high-side switch turns on 3.5 5 6.6 a low-side current limit i limit_l when low-side switch turns on -890 -630 -330 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 = 80mv 0.8 1 1.2 mhz maximum duty cycle d max v fb = 80mv 90 94 % minimum on time t on min 70 ns restart timer hiccup timer at fault condition t start 2.4 ms
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 5 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics (continued) typical values are v in = 12v, t j = 25c, unless otherwise noted. minimum and maximum values are at v in = 12v, t j = -40c to +125c, unless otherwise noted, guaranteed by characterization. parameters symbol condition min typ max units bootstrap bias voltage for high-side driver v bst -v sw 5.5v v in 24v 4.8 5.1 5.5 v v in = 4.2v 3.6 v ntc high-threshold voltage v hntc v fb = 95mv 1.16 1.25 1.34 v low-threshold voltage v lntc 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 hysteresis 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 60 c note: 5) guaranteed by characterization.
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 6 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics 95 96 97 98 99 100 101 102 103 -50 -25 0 25 50 75 100 125 150 60 80 100 120 140 160 180 -50 -25 0 25 50 75 100 125 150 40 60 80 100 120 140 160 -50 -25 0 25 50 75 100 125 150
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 7 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performace characteristics (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. i led (a) v dim analog level (v) v out (v) v out (v) line regulation 2 wleds in series analog dimming curve ntc curve v in (v) v ntc level (v) v in (v) efficiency vs. v in 2 wleds in series 84 86 88 90 92 94 96 98 100 6 8 10 12 14 16 18 20 22 24 26 76 79 82 85 88 91 94 97 100 01234567891011 v in =12v v in =5v -1.6 -1.2 -0.8 -0.4 0.0 0.4 0.8 1.2 1.6 6 8 10 12 14 16 18 20 22 24 26 -0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8 01234567891011 v in =12v v in =5v 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 v dim rising v dim falling 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0.3 0.5 0.7 0.9 1.1 1.3 1.5 i led (a)
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 8 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performace characteristics (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. en start-up en shutdown open led protection minimum analog dimming v en/dim =0.6v short led+ to gnd protection short led+ to led- protection v in 2v/div. v en 1v/div. v sw 5v/div. i l 500ma/div. i led 500ma/div. v sw 10v/div. i led 500ma/div. i l 500ma/div. v in 2v/div. v out 2v/div. v sw 5v/div. i l 200ma/div. v en 1v/div. v sw 10v/div. i led 500ma/div. i l 500ma/div. v en/dim 200mv/div. v sw 5v/div. i led 20ma/div. i l 500ma/div. v fb 50mv/div. v sw 5v/div. i l 500ma/div. v sw 5v/div. i l 1a/div. steady state v in 5v/div. v sw 10v/div. i led 500ma/div. i l 500ma/div. v in 5v/div. v sw 10v/div. i led 500ma/div. i l 500ma/div. v in start-up v in shutdown
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 9 8/25/2016 mps proprietary information. patent protec ted. 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 vin supply voltage. the MP2410 operates on a 4.2v to 24v, unregulated input. an input capacitor is needed to prevent large voltage spikes from appearing at the input. 4 2 fb current sense feedback voltage. fb?s internal reference voltage is 0.1v. 5 3 en/dim on/off control input and dimming command input. leaving en/dim floating or applying a voltage higher than 0.59v on en/dim turns on the MP2410. for analog dimming, when the en/dim voltage rises up from 0.7v to 1.44v, the output current changes from its min value to the full-scale led current. 6 4 bst bootstrap. connect a capacitor between sw and bst to form a floating supply across the power switch driver. this capacitor is needed to drive the power switch?s gate above the supply voltage. - 1 ntc led temperature protection. connect an ntc resistor from ntc to gnd to reduce the output current to protect the led when the ambient temperature rises up at high levels. - 8 nc no connection.
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 10 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. block diagram en/dim ntc vin bst sw fault detection fb gnd input power supply 50k ? 40pf 2pf figure 1: functional block diagram
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 11 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the MP2410 is a high-frequency, synchronous, rectified, step-down, switching mode led driver with a built-in, internal power mosfet and synchronous rectifier switch. the MP2410 offers a very high-performance solution that achieves up to 2a of continuous output led current with excellent load and line regulation over a wide input supply range. the MP2410 operates in a fixed 1mhz frequency and uses peak current control mode to regulate the output current. a new switching cycle is initiated by 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 reaches 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. the 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 switch. to prevent a shoot-through, a dead time is implemented to prevent the high- side and low-side fets from turning on at the same time. when the duty cycle of one switching period reaches 94%, the current in the high-side power mosfet cannot reach the comp-set current value, and the high-side power mosfet is forced to turn off. under-voltage lockout (uvlo) and ic start- up/shutdown procedure under-voltage lockout (uvlo) is implemented to prevent the chip from operating at an insufficient supply voltage. the MP2410 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 appropriate thresholds, the chip starts up. the reference block starts first to generate stable reference voltages and currents. the internal regulator is then enabled. the regulator provides a stable supply for the remaining circuitries. three events can shut down the chip: en/dim low for longer 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 internal supply 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 mosfet 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 ramps up from 0v. the soft-start period lasts until the voltage on the soft-start capacitor exceeds the 0.1v 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. the bootstrap capacitor voltage is regulated internally. during normal operation, a 5.1v bootstrap voltage is maintained between bst and sw. enable and dimming control (en/dim) en/dim is a control pin that turns the regulator on and off and dims the output led current through a dc signal. leave en/dim floating or drive it high to turn on the MP2410. after en/dim is pulled low for t off_delay (22ms, typically), the MP2410 is turned off. figure 2 shows the control logic of en/dim.
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 12 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. figure 2: en/dim time sequence analog dimming apply a dc signal on en/dim to dim the MP2410 in analog dimming mode. when the voltage on en/dim is 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 higher 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 falling 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 open led if the led is open without a feedback signal, the MP2410 works at the maximum duty cycle, 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 integrates led short-circuit protection (scp) circuitry. there are several features protecting the MP2410 from damage when an led short circuit occurs. the MP2410 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. once the fb level rises up to reach v fb_burst_al , the chip stops switching until the fb level drops to a lower value, and the system works in burst mode. in the worst-case scenario, the led is shorted to gnd. if the cycle-by-cycle current-limit function cannot clamp the current overshoot sufficiently, then the current through both the high-side and low-side fets is also monitored by over-current detector inside the chip. if this current is higher than the short-circuit threshold (i ocp ), the MP2410 treats this as a short-circuit condition. when an over-current condition or short-circuit condition is detected, the MP2410 turns off both the high-side and low-side mosfets for 2.4ms and restarts. during this period, v comp is pulled down to ground, so the restart from the fault condition is also done with a soft start. thermal protection ntc provides led thermal protection. an ntc resistor used to monitor the ambient temperature can be connected to ntc directly. there is an internal current source flowing out of ntc. the corresponding voltage is generated on the external ntc resistor and the led current changes (see figure 4).
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 13 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. i led 0 v h_ntc v l_ntc v sd_ntc v ntc full scale min scale 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 shuts down the switching cycle with thermal shutdown until the temperature drops to its lower threshold. thermal shutdown thermal shutdown is implemented to prevent the chip from operating at exceedingly high temperatures. when the silicon die temperature is higher than 150c, otp shuts down the entire chip. when the temperature is below its lower threshold (typically 90c), the chip restarts.
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 14 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. application information 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): s led 0.1v r i ? (1) for 2a led current output, choose r s = 50m ? . selecting the inductor an inductor less than 100h with a nominal dc current rating at least 25% higher than the maximum load current is recommended for most applications. for the highest efficiency, the inductor?s dc resistance should be less than 100m ? . for most designs, the required inductance value can be derived from equation (2): out in out in l sw v(vv) l vif ?? ? ?? ? (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): l l(max) led i ii 2 ? ?? (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 10f 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 10f ceramic capacitor is sufficient. pcb 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 external 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.
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 15 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuit 4.7uh l1 ds84lcb-b1134as-4r7n 10nf/50v c3 1 en/dim tp2 4.7uf/35v c1 1206 nc r5 20k r6 0 r3 10uf/35v c2 1210 1k r4 0.1/1% r1 1206 0.2/1% r2 1206 1 vin tp1 1 gnd tp3 1 led+ tp4 1 led- tp5 n/c 8 vin 7 sw 6 gnd 5 bst 4 en/dim 3 fb 2 ntc 1 u1 MP2410 2.2nf/50v c4 ntc1 figure 5: typical buck converter application, v in = 8v to 24v, v o = 5.9v, i led = 1.5a
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change MP2410 rev. 1.0 www.monolithicpower.com 16 8/25/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information tsot23-6
MP2410 ? 24v, 2a, 1mhz, synchronous, step-down, led driver preliminary specifications subject to change notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP2410 rev. 1.0 www.monolithicpower.com 17 8/25/2016 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information (continued) tsot23-8 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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