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MPM3530 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 1 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. description the MPM3530 is an e asy - to - use , fully integrated , 55v input, 3 a , step - down , dc/dc power module. the MPM3530 integrates a monolithic dc/dc converter, power inductor, input capacitors , and the necessary resistors and capacitors in a compac t qfn pac kage. the total power solution only requires a minimal number of external components . the MPM3530 adopts a peak - current - mode control architecture with a fast transient response. th is module provides over - current protectio n (ocp) with valley - current detection , which is used to prevent current run a way. the MPM3530 also has accurate and reliable over - voltage protection (ovp) and auto - recovery thermal protection. an optional external soft start is av ailable , and enable and power good indicator functions are provided . to increase efficiency, the mp m3530 scal es down the switching frequency automatically when the load is light. features ? wide 4.5 v to 55 v operating inp ut range ? efficiency up to 9 2. 3% ? adjustable, wide output voltage : 1v to 1 5 v ? programmable switching frequency with external sync function ? external soft start (ss) ? over - current protection (ocp) ? high efficiency for light - load operation ? over - volta ge protection (ovp) and thermal shutdown protection ? power good (p g ) indication ? meet en55022 class b emission ? operating temperature range: - 40 c to 85 c ? available in a qfn - 4 7 ( 1 0 mm x 1 2 mm x 4 mm ) package applications ? industrial power systems ? diagnostic machines/test equipment ? distributed power systems ? telecom and networking systems all mps parts are lead - free, halogen - free, and adhere to the rohs directive. for mps green status, please visit the mps website under quality assura nce. mps, the mps logo, and simple, easy solutions are trademarks of monolithic power systems, inc. or its subsidiaries. typical application efficiency & p loss vs. load current v out = 3.3v v i n f b o u t e n f r e q c o m p 4 . 5 - 5 5 v c 1 r 1 g n d c 2 m p m 3 5 3 0 p g a g n d v d d r 2 r 3 c 3 3 . 3 v @ 3 a 2 . 2 n f 2 . 5 3 k 1 0 k 4 . 3 2 k 2 x 2 2 f 4 . 7 f r 5 1 0 0 k r 4 1 m r 6 1 0 2 k 0 0.5 1 1.5 2 2.5 20 30 40 50 60 70 80 90 100 0 1 2 3 ploss (w) efficiency (%) load current (a) vin=12v_efficiency vin=24v_efficiency vin=36v_efficiency vin=12v_ploss vin=24v_ploss vin=36v_ploss
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 2 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. ordering information part number* package top marking MPM3530 grf qfn - 47 ( 1 0 mm x 1 2 mm x 4 mm) see below top marking mps: mps prefix yy: year code ww: week code mp3530: first six digits of the part number lllllllll: lo t number m: module package reference top view qfn - 47 ( 10 mm x 1 2 mm x 4 mm) v i n p g n d e n f r e q p g n d f b v i n c o m p a g n d a g n d a g n d s s p g p g n d v d d v i n p g n d b s t s w s w p g n d o u t o u t o u t o u t o u t v i n s w s w s w s w p g n d s w s w o u t o u t o u t o u t o u t o u t 1 1 2 1 3 2 2 2 3 3 4 3 5 4 4 p g n d p g n d o u t p g n d p g n d p g n d o u t 2 3 4 5 6 7 8 9 1 0 1 1 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 3 6 3 7 3 8 3 9 4 0 4 1 4 2 4 3 4 5 4 6 4 7
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 3 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. pin functions pin # name description 1, 42 - 44 v in input supply . vin supplies power to all of the internal control circuitries and the vdd regulator. place a decoupling capacitor to ground close to vin to minimize switching spikes. use wide trace s to connect vin . 2, 12 - 16, 30, 38, 41, 45, 46 pgnd module power ground pin. 3 bst bootstrap. bst is the positive power supply for the inter nal floating high - side mosfet driver. keep bst floating. 4 - 11 sw switch output . keep sw floating. 17 - 28, 47 out module voltage output node. use wide trace s to connect out . 29 vdd power for internal mosfet driver and bst charging circuit. 31 pg powe r good indication. connect a resistor from pg to a pull - up power source if it is being used. 32 ss soft start . float ss for a default 1.2ms ss time. the ss time can be extended by connecting an external capacitor between ss and agnd. 33 - 35 agnd ground for internal logic and signal circuit. 36 comp compensation networks setting . connect an external resistor series with a capacitor between comp and agnd. see the application information section on page 15 for compensation network configuration details . 37 fb feedback. fb is the input to the pwm comparator. connect an external resist or divider between the output and agnd. 39 freq frequency set p in. connect a resistor from freq to ground to set the switching frequency. if an external sync clock is applied to freq , the converter follow s this sync clock frequency. 40 en enable input . pull en below the specified threshold to shut down the chip. there is no internal pull - up or pull - down circuit, so en cannot be float ed . absolute maximum rat ings (1) supply v oltage ( v in ) ................................ ..... 60v v sw ................................ ....... - 0.5 to ( v in + 0.5v ) v bst ................................ ..................... v sw + 6v v out ................................ .......................... 16.5 v all other pins ................................ .... - 0.3v to 6v en sink current ................................ ........ 150 a all other pins ................................ .... - 0.3v to 4 v continuous power dissipation (t a = + 25 c) ( 2 ) ................................ ................................ ..... 5w junction temperature ............................... 150 c lead temperature ................................ .... 260 c storage temperature .................. - 65 c to 150 c recommended operating conditions ( 3 ) supply voltage ( v in ) ........................ 4. 5 v to 55 v output voltage ( v out ) ......................... 1v to 1 5 v operating junction t emp . (t j ) ... - 40 c to +125 c thermal resistance ja jc qfn - 47 ( 1 0 mm x 1 2 mm x4 mm) evm3530 - rf - 01a (4) ............. 17 ..... 3.4 .... c/w jesd51 - 7 (5) ......................... 17 ..... 7.4 .... 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 , 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 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 con ditions. 4) measured on evm3530 - rf - 01a,4 - layer pcb, 76mm x 76mm. 5) the value of ja given in this table is only valid for comparison with other packages and cannot be used for design purposes. these values were calculated in accordance with jesd51 - 7 and simulated on a specified jedec board. they do not represent the perf ormance obtained in an actual application .
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 4 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. electrical character istics v in = 24 v, v en = 3.3 v , t j = - 40 c to 125 c , unless otherwise noted. parameter symbol condition min typ max units input voltage range input volt age range v in 4.5 55 v output voltage range output voltage range v out 1 15 v load regulation ( 6 ) v out_dc _load v in = 24 v, load current from 0 to 3a 1 % v out line regulation ( 6 ) v out_dc _line i out = 3a, v in from 4.5v to 55v 1 % v out quiescent c urrent quiescent current i q v en = 3.3v, v fb = 1 .0 2 v 450 6 7 0 a current limit peak current limit i lim it 10% duty cycle 5 .5 8.5 11 .5 a vdd regulator vdd regulator output voltage v dd 3.4 3.6 3.8 v switching frequency switching frequency f sw r freq = 100 k 400 52 0 64 0 khz over - voltage and under - voltage protection (ovp, uvp) ovp threshold v ovp_th v fb(ovp) /v fb 108 115 122 % vin uvlo rising threshold v inuv_r 3.7 3.9 4.1 v vin uvlo falling threshold v inuv_f 3.3 3.5 3.7 v error amplifier feedbac k voltage v fb 4.5v v in 55v 0.98 1 1. 02 v fb current i fb v fb = 1.07v 10 50 na comp sink/source current i comp 10 3 0 52 a pwm comparator minimum on time ( 7 ) t on_min 90 ns minimum off time t off_min 100 ns enable (en) en rising thresho ld v en_r 1.4 1.6 1.8 v en falling threshold v en_f 1.1 1.3 1.5 v en threshold hysteresis v en_hys 300 mv soft start (ss) soft - start time ( 6 ) t ss 1.2 ms power good power good threshold v pg_th v out rising , v fb(pg) /v fb 86 90 94 % v out falling , v fb(pg) /v fb 81 85 89 power good hysteresis v pg_hys ? v fb(pg) /v fb 5 % power good delay t pg_dl v out rising 8 22 37 s v out falling 8 21 33 s
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 5 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. electrical character istics (continued) v in = 24 v, v en = 3.3 v , t j = - 40 c to 1 25 c , unless otherwise noted. parameter symbol condition min typ max units thermal thermal shutdown ( 7 ) t sd 1 70 c thermal hysteresis ( 7 ) t sd_hys 10 c notes : 6) not tested in production and guaranteed by over - temperature correl ation . 7) not tested in production and guaranteed by sample characterization.
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 6 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. typical performance characteristics performance waveforms are tested on the evaluation board of the design example section . v in = 24 v, t a = 25 c, unless otherwise noted. efficiency & p loss vs. load current v out = 1.2v efficiency & p loss vs. load current v out = 3.3v efficiency & p loss vs. load current v out = 5v efficiency & p loss vs. load current v out = 12v load r egulation v out = 3.3v line r egulation v out = 3.3v 0 0.5 1 1.5 2 2.5 0 10 20 30 40 50 60 70 80 90 0 1 2 3 ploss (w) efficiency (%) load current (a) vin=12v_efficiency vin=24v_efficiency vin=36v_efficiency vin=12v_ploss vin=24v_ploss vin=36v_ploss 0 0.5 1 1.5 2 2.5 20 30 40 50 60 70 80 90 100 0 1 2 3 ploss (w) efficiency (%) load current (a) vin=12v_efficiency vin=24v_efficiency vin=36v_efficiency vin=12v_ploss vin=24v_ploss vin=36v_ploss 0 0.5 1 1.5 2 2.5 3 20 30 40 50 60 70 80 90 100 0 1 2 3 ploss (w) efficiency (%) load current (a) vin=12v_efficiency vin=24v_efficiency vin=36v_efficiency vin=12v_ploss vin=24v_ploss vin=36v_ploss 0 0.5 1 1.5 2 2.5 3 3.5 4 50 60 70 80 90 100 0 1 2 3 ploss (w) efficiency (%) load current (a) vin=24v_efficiency vin=36v_efficiency vin=24v_ploss vin=36v_ploss -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 0 1 2 3 load regulation (%) load current (a) vin=12v vin=24v vin=36v -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 0.2 5 25 45 line regulation (%) input voltage (v) io=3a io=1a
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 7 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. typical performance characteristics (continued) performance waveforms are tested on the evaluation board of the design example section . v in = 24 v, t a = 25 c, unless otherwise noted. thermal d era ting v out = 1.2 v thermal d era ting v out = 3.3 v thermal d era ting v out = 5 v thermal d era ting v out = 12 v 0 0.5 1 1.5 2 2.5 3 3.5 -40 10 60 load current (a) ambient temperature (degc) vin=24v vin=36v vin=12v 0 0.5 1 1.5 2 2.5 3 3.5 -40 10 60 load current (a) ambient temperature (degc) vin=24v vin=36v vin=12v 0 0.5 1 1.5 2 2.5 3 3.5 -40 10 60 load current (a) ambient temperature (degc) vin=24v vin=36v vin=12v 0 0.5 1 1.5 2 2.5 3 3.5 -40 10 60 load current (a) ambient temperature (degc) vin=24v vin=36v
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 8 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. typical performance characteristics (continued) performance waveforms are tested on the evaluation board of the design example section . v in = 24 v, t a = 25 c, unles s otherwise noted. start - u p through vin v out = 3.3v, i out = 0a start - u p through vin v out = 3.3v, i out = 3a ch1: v in 20v/div. ch2: v out 2 v/div . ch 3 : sw 20v/div. ch 4 : i out 5a/div. ch1: v in 20v/div. ch2: v out 2 v/div . ch 3 : sw 20v/div. ch 4 : i out 5a/d iv. 2m s/div. 2m s/div. output ripple v out = 3.3v, i out = 0a, 4x22f caps output ripple v out = 3.3v, i out = 3 a, 4x22f caps ch1: v out /ac 20mv/div. ch1: v out /ac 10mv/div. 10m s/div. 2 s/div. load transient response v out = 3 .3v, 1.5 - 3a, 4x22f caps load transient response v out = 3.3v, i out = 0 - 3a, 4x22f caps ch1: v out /ac 50mv/div. ch 4 : i out 2a/div. ch1: v out /ac 200mv/div. ch 4 : i out 2a/div. 2m s/div. 2m s/div.
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 9 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. typical performance characteristics (continued) performance waveforms are tested on the evaluation board of the design example section . v in = 24 v, t a = 25 c, unless otherwise noted. conducted emission, en55022 class b v out = 3.3v input pi filter : 10 f, 4.7 h, 10 f radiated emi ssion, en55022 class b v out = 3.3v input pi filter : 10 f, 4.7 h, 10 f ch 2 : on/pd 2 v/div . ch 1 : v out 5 v/div. ch 3 : gok 2 v /div. ch 4 : i in 2.5a /div. ch 2 : on/pd 2 v/div . ch 1 : v out 5 v/div. ch 3 : gok 2 v /div. ch 4 : i in 2.5a /div. 1 s/div. 4 s/div. em i test circ uit 0 10 20 30 40 50 60 70 80 150k 300 400 500 800 1m 2m 3m 4m 5m 6 8 10m 20m 30m level in dbv f re q ue n cy in h z en 55022 voltage on mains qp 0 5 10 15 20 25 30 35 40 45 50 55 60 30m 50 60 80 100m 200 300 400 500 800 1g level in dbv/m f re q ue n cy in h z en 55022 electric field strength 3 m qp v i n f b o u t e n f r e q c o m p v i n = 4 . 5 - 5 5 v c 1 r 1 g n d c 2 m p m 3 5 3 0 p g a g n d v d d r 2 r 3 c 3 3 . 3 v @ 3 a 2 . 2 n f 2 . 5 3 k 1 0 k 4 . 3 2 k 2 x 2 2 f 4 . 7 f r 5 1 0 0 k r 4 1 m r 6 1 0 2 k l 1 4 . 7 h 1 0 h c i n 2 c i n 1 1 0 h v e m i f b 1 1 0 0 @ 1 0 0 m 1 , 4 2 - 4 4 4 0 2 9 3 1 3 9 3 3 - 3 5 2 , 1 2 - 1 6 , 3 0 , 3 8 , 4 1 , 4 5 , 4 6 3 6 3 7 1 7 - 2 8 , 4 7
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 10 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. block diagram figure 1 : functional block diagram i s w 1 v s s _ i n t e r n a l s s _ i n t e r n a l s s 4 0 0 m v p l l c l k f b f s w f o l d b a c k f r e q s e t t i n g p l l f s w s e t t i n g p l l o n c o m p f s w f o l d b a c k 1 1 0 % r e f 9 0 % r e f f b o c z c c l k z c s w l o w r b c p b l s d m o s q h s d m o s h s c u r r e n t l i m i t c o m p o u t v i n b s t c l k l s d r v l l o w n o o c p g n d p g f b c o m p f r e q i n t e r n a l r e g u l a t o r ( 2 . 5 v ) v d d r e g u l a t o r ( 3 . 6 v o r 4 . 8 v ) v o l t a g e r e f e r e n c e c u r r e n t r e f e r e n c e t h e r m a l s h u t d o w n v i n u v l o h o u s e k e e p i n g 2 v c l k v d d i s w e n 4 . 7 h
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 11 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. operation the mp m3530 is a high - performance and complete power solution that features a wide input voltage range, high efficiency, ext ernal / internal soft start, programmable frequency , and comprehensive protection mode s ( ovp, ocp, otp ) . pulse - width modulation ( pwm ) control the mp m3530 uses peak - current - mode control to regulate the output voltage. a pulse - width modulat ion ( pwm ) cycle is initiated by the internal clock at the beginning of e very cycle. after the high - side mosfet (hs - fet) turns on, the inductor current rise s linearly to prov ide energy to the load. the hs - f et remains on until its curr ent reaches the comp vol tage (v comp ), which is the output of the internal error amplifier (ea). the output voltage of the error amplifier depends on the difference of the output feedback voltage and the internal high - precision reference , and it decide s how much energy should be transferred to the load. the higher the load current, the higher v comp will be . after the high - side switch turns off, the low - side switch turns on , and the inductor current flow s through the low - si de switch. to avoid a shoo t - through issue, a dead time is inserted to prevent the hs - fet and ls - fet from turn ing on at the same time. for each turn - on and turn - off in a switching cycle, the hs - fet turns on and off with a minimum on and off time limit. light - load operation to achieve high efficiency, the MPM3530 uses two features during light load . first, when the load current decreases, the inductor current drop s at the same time. the ls - fet turn s off to save driver loss when the inductor current drops to zero. second, when the load decreases, the switching frequency is scaled down to reduce the switchi ng loss after v comp drops down below a certain threshold. error amplifier (ea) the error amplifier compares the fb voltage (v fb ) with the internal reference and outputs a current proportional to the difference between the two. this current is used to charge the external compensation networks to form v comp , which is used to control the hs - fet peak current and regulate the output voltage. oscillator and sync function the internal oscillator frequency is set by the frequency set resistor (r freq ) con nected between freq and gnd . the relationship between the oscillator frequency and r freq is shown in table 1 on page 14 . during light load, the s witching frequency is scal ed down according to v comp . the switching frequency start s decreas ing when v comp is lower than about 0.8v. the switching is disabled when v comp drops below about 0.7v. reduce switching loss and thermal dissipation, the switching frequency is decreased according to v fb . when fb is lower than 25% x r e f , the switching frequency starts decreas ing from the normal value a nd finally drops to 5% of the normal value when fb is zero. freq can be used to synchronize the internal oscillator rising edge to an external clock falling edge. ensure that the high amplitude of the sync clock is higher than 1.5v an d the low amplitude is lower than 1v to drive the internal logic. the recommended external sync frequency is in the range of 100khz to 1mhz. there is no pulse - width requirement but note that there is always a parasitic capacitance of the pad . if the pulse width is too short, a clear rising and falling edge may not be seen due to the parasitic capacitance. a pulse longer than 100ns is recommended in the application. enable control ( en ) en is a control pin that turns the module o n and off . drive en above 1.6v to turn on the regulator . drive en below 1.3v to turn off the regulator .
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 12 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. there is no internal pull - up or pull - down at en, so when it is floating, the en status is uncertain. en is clamped internally using a 6.5v zener diode between en and gnd . connecting en to a voltage source directly without any pull - up resistor requires limiting the voltage amplitude to 6v to prevent damage t o the zener diode. en can be connected to a higher voltage ( such as vin) through a pull - up resistor if the system does not have another logic signal acting as the enable signal. if doing this, en sure that the pull - up resistor is high enough to keep the sink current flowing into en below 150 a to avoid damaging the zener diode. for example, when connecting en to v in = 12v, r pull - up (12v - 6.5v) 150a = 37k. soft start (ss) a soft start (ss) is im plemented in the MPM3530 to ensure a smooth output voltage during power - on and power - off. the soft - start function also helps reduce inrush current during start - up. the soft - start function is achieved by rampin g ss up slowly and using ss to override the internal reference (ref) when ss - 900mv is lower than ref. when ss - 900mv is higher than ref, ref regains control. 900mv is the offset voltage of ss , which means ss is detected as 0 internally whe n it is lower than 900mv. to minimize the delay for ss to reach 0.9v, an internal pull - up circuit with about 30 a of average current pulls ss up to 600mv . then use a 4 a constant current to charge ss until it reaches 2.5v. when ss is in the rang e of 0.9 - 1.9v, it overrides ref as the reference voltage of the error amplifier. during this period, the output voltage ramps up from 0 to the regulated value following the rise of ss . an internal 4.7 nf ss capacitor is used in the MPM3530 . the default ss time can be estimated with equation (1) : (1) the default ss time is about 1.2 ms. if a longer ss time is needed, an external ss capacitor can be added between ss and agnd . the external capacitor value can be determined with equation (2) : (2) over - voltage protection (ovp) the MPM3530 monitors the feedback output voltage to achieve over - voltage protection (ovp) . if v fb is higher than 103% x ref, the MPM3530 switches to sleep mode , the hs - fet turn s off , and the ls - fet turn s on to discharge the output energy. the MPM3530 resumes normal operation after v fb drops below 103% x ref. if v fb is higher than 110% x r ef , the hs - fet and ls - fet are turned off immediately. then both mosfets are latched , and the pg signal is asserted to indicate the fault status . recycle en or vin to clear the protection. over - current protection (ocp) the MPM3530 has cycle - by - cycle peak - current - limit protection and valley - current detection protection. the inductor current is monitored during the hs - fet on state. if the inductor current exceeds the current limit value set by v comp , the hs - fet turns off immediately. then the ls - fet is turned on to discharge the en ergy , and the inductor current decrease s . the hs - fet will not turn on again unless the inductor valley current is below a certain current threshold ( valley current limit ) . this is useful for preventing a n inductor current run away. both the peak current limit and the valley current limit value s depend on v fb . if the feedback output voltage is higher than 50% x ref, the current limit value is at the normal value. if the feedback output voltage is lower than 50% x rff, the current limit decrease s to half the normal value when the feedback output voltage is zero. this feature is very useful for reduc ing over - curren t protection ( ocp ) thermal dissipation , which may worsen when the output voltage is shorted. it is also useful for reduc ing high inrush current during start - up. under - voltage lockout ( uvlo ) protection the MPM3530 has an input under - voltage lockout protection (uvlo). assuming that en is ) a ( i ) v ( v ) nf ( c ) ms ( t ss ref ss ss ? ? ? ) nf ( . ) v ( v ) a ( i ) ms ( t ) nf ( c ref ss ss ss 7 4 ? ? ? ?
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 13 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. active, the MPM3530 is powered on when the input voltage is higher than the uvlo rising threshold . the MPM3530 is powered off when the input voltage drops below th e uvlo falling threshold. thermal shutdown protection thermal shutdown is employed in the mp m3530 by monitoring the temperature internally. if the junction temperature exceeds the threshold (typically 170c ), the regulator shuts off . the re gulator turns on again when the temperature drops below 160c . there is a hysteresis of ~ 10c . power good (pg) the mp m3530 has one power good (pg) pin out to indicate normal operation after a soft - start time. pg is the open drain of an internal mosfet and should be connected to vdd or an external voltage source through a resistor (i.e. : 100k ). after the input voltage is applied, the mosfet is turned on , and pg is pulled to gnd before ss is ready. after v fb reaches 90% of v ref , the mosfet turns off , and pg is pulled high by an external voltage source. whe n v fb drops to 85% of v ref , the pg voltage is pulled to gnd to indicate a failure output status. floating driver and bootstrap charging an internal bootstrap capacitor ( typically 0.1f ) between bst and sw powers the float ing power mosfet driver. this floating driver has its own uvlo protection. this uvlos rising threshold is 2.3v with a hysteresis of 300mv. the drivers uvlo is soft - start related . when the bootstrap voltage reaches its uvlo threshold, the soft - star t circuit resets. when the bootstrap uvlo is gone, the reset is off , and the soft - start process resumes. the dedicated internal bootstrap regulator regulates and charges the bootstrap capacitor to 4.2v. when the voltage between the bst and sw nodes is less than its regulation, a pmos pass transistor from vin to bst turns on . the charging current path is from vin to bst to sw. as long as v in is higher than v sw sufficiently , the bootstrap capacitor can be charged. when the hs - fet is on , v in v sw , so the bootstrap capacitor cannot be charged. when the ls - fet is on , the difference between v in and v sw is at its largest, making it the best period to charge. when there is no current in the inductor, v sw = v out , so the d ifference between v in and v out can charge the bootstrap capacitor. at higher duty cycles, there is less time for the bootstrap charging , so the bootstrap capacitor may not be charged s ufficiently . if the internal circuit does not have sufficient voltage and the bootstrap capacitor is not charged, extra external circuitry can be used to ensure that the bootstrap voltage is within the normal o perating region.
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 14 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. application in formation setting the switching frequency the MPM3530 has an externally adjustable frequency. the switching frequency (f s w ) can be set using a resistor at freq (r freq ). table 1 shows recommended r freq value s for various f s w values. table 1 : f sw vs. r freq f sw (khz) r freq (k) 1000 47.5 900 56 800 63.4 700 73.2 600 84.5 500 102 400 133 300 178 200 261 100 523 setting the output voltage a resistive voltage divider from the output voltage to fb sets the output voltage. the voltage divider divides the output volta ge down to the feedback voltage by the ratio shown in equation (3): (3) calculate the output voltage with equation (4): (4) for example, if r 1 is 10k?, then r2 can be calculated with equation (5): (5) for a 3.3v output voltage, r 1 is 10k?, and r 2 is 4.32 k?. selecting the input capacitor the input current to the step - down converter is discontinuous and requires a capacitor to supply ac current to the step - down converter w hile maintaining the dc input voltage. use capacitors with a low equivalent series resistance (esr) for the best performance. ceramic capacitors are preferred, but tantalum or low esr electrolytic capacitors may also be sufficient. for simplification, c hoose an input capacitor with an rms current rating greater than half of the maximum load current. the input capacitor (c1) can be electrolytic, tantalum, or ceramic. when using electrolytic or tantalum capacitors, place a small, high - quality, ceramic cap acitor (0.1f) as close to the ic as possible. when using ceramic capacitors, ensure that they have enough capacitance to provide a sufficient charge to prevent excessive voltage ripple at the input. the input voltage ripple caused by the capacitance can b e approximated with equation (8): (8) selecting the output capacitor the output capacitor (c2) maintains the dc output voltage. use ceramic, tantalum, or low esr electrolytic capacitors. low esr capacitors are recommended to keep the output voltage ripple low. the output voltage ripple can be estimated with equation (9): (9) where l is the inductor value, and r esr is the esr value of the output capacitor. for ceramic capacitors, the capacitance dominates t he impedance at the switching frequency and contributes the most to the output voltage ripple. for simplification, the output voltage ripple can be estimated with equation (10): (10) for tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. fb out r2 v =v r1+r2 ? out fb r1+r2 v =v r2 ? k 1 v 10 r2 out ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? in out in out sw load in v v 1 v v c1 f i v ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? c2 f 8 1 r v v 1 l f v v sw esr in out sw out out ? ? ? ? ? ? ? ? ? ? ? ? ? ? in out 2 sw out out v v 1 c2 l f 8 v v
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 15 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. for simplification, the output ripple can be approximated with equation (11): (11) the characteristics of the output capacitor also affect the stability of the regulation syste m. the MPM3530 can be optimized for a wide range of capacitances and esr values. compensation components the MPM3530 employs current - mode control for easy compensation and fast transient response. comp is the output of the internal error amplifier and cont rols system stability and transient response. a series resistor - capacitor combination sets a pole - zero combination to control the control systems characteristics. the dc gain of the voltage feedback loop can be calculated with equation (12): (12) where a vea is the error amplifier voltage gain ( 10 00v/v), g cs is the current - sense transconductance ( 12 a/v), and r load is the load resistor value. the system has two important poles: one due to the compensation capacitor (c 3 ) and the output resistor of the error amplifier, and the other due to the output capacitor and the load resistor. these poles can be determined with equation (13) and equation (14): (13) (14) where g ea is the error - amplifier transconductance ( 540 a/v). the system has one important zero due to the compensation capacitor and the compensation resistor (r 3 ). this zero can be determined with equation (15): (15) the system may have another sign ificant zero if the output capacitor has a large capacitance or a high esr value. this zero can be determined with equation (16): (16) in this case, a third pole set by the compensation capacitor (c 4 ) and the compensation resistor can compensate for the effect of the esr zero. this pole can be determined with equation (17): (17) the goal of compensation design is to shape the converter transfer function for a desired loop gain. the system crossover frequenc y where the feedback loop has unity gain is important, since lower crossover frequencies result in slower line and load transient responses, while higher crossover frequencies lead to system instability. generally, set the crossover frequency to ~0.1xf sw . use the following steps to design the compensation: 1. choose r 3 to set the desired crossover frequency. r3 can be determined with equation (18): (18) where f c is the desired crossover frequency. 2. choose c 3 to achieve the desired phas e margin. for applications with typical inductor values, set the compensation zero (f z1 ) to <0.25xf c to provide a sufficient phase margin. esr in out sw out out r v v 1 l f v v ? ? ? ? ? ? ? ? ? ? ? out fb vea cs load vdc v v a g r a ? ? ? ? vea ea p1 a c3 2 g f ? ? ? load p2 r c2 2 1 f ? ? ? r3 c3 2 1 f z1 ? ? ? esr esr r c2 2 1 f ? ? ? r3 c4 2 1 f p3 ? ? ? fb out cs ea c v v g g f c2 2 r3 ? ? ? ? ?
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 1 6 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. 3. c 3 can be calculated with equation (19): (19) determine if c 4 is required. c4 is required if the esr zero of the output capacitor is located at <0.5xf sw , or equation (20) is valid: (20) if this is the case, use c 4 to set the pole (f p3 ) at the location of the esr zero. determine c 4 with equation (21) : (21) external b ootstrap diode f or high duty - cycle operations where v out / v in > 65% , the re is less time available for the bootstrap charging , so the bootstrap capacitor may not be charged sufficiently . t his affects efficiency and norm al operation. a n external bootstrap diode from the 3 - 5v rail to bst can help charge the bootstrap capacitor and enhance efficiency (see figure 2) . the output voltage is a good choice for this power supply if it is in the above range. the bootstrap diode can be a low - cost one , such as in4148 or bat54. figure 2 : external bootstrap diode at no load or light load, the converter may operate in pulse - skip mode to maintain the output - voltage regulation. u nder this condition, v sw = v out for most of the time , so the diode from v out to bst cannot charge the bootstrap capacitor . for a sufficient gate voltage during pulse - skip mode, v in - v out should be no less than 3v. for example, if v out = 3.3v, then v in must exceed 3.3v + 3v = 6.3v to maintain a sufficient bootstrap voltage at no load or light load. to meet this requirement, en can program the input uvlo voltage to v out + 3v. pcb layout guidelines (10) efficient pcb layout is critical for stable operation. for best r esults, refer to figure 3 and follow the guidelines below. 1. keep the connection of the input ground and gnd as short and wide as possible. 2. ensure that all feedback connections are short and direct. 3. place the feedback resistors as close as to the chip as possible. 4. route sensitive analog areas such as fb away from sw. 5. place enough vias around the chip for better thermal performances . c f r3 2 4 c3 ? ? ? 2 f r c2 2 1 sw esr ? ? ? r3 r c2 c4 esr ? ? c b s t c o u t l b s t s w 3 v - 5 v r a i l 1 n 4 1 4 8 v o u t
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 17 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. top layer bottom layer figure 3 : recommended layout
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 18 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. typical application circuit s figure 4 : 3.3v output typical application circuit figure 5 : - 5 v output typical application circuit figure 6 : 12v output typical application circuit v i n f b o u t e n f r e q c o m p 4 . 5 - 5 5 v @ 5 0 0 k h z c 1 r 1 g n d c 2 m p m 3 5 3 0 p g a g n d v d d r 2 r 3 c 3 3 . 3 v @ 3 a 2 . 2 n f 2 . 5 3 k 1 0 k 4 . 3 2 k 2 x 2 2 f 4 . 7 f r 5 1 0 0 k r 4 1 m r 6 1 0 2 k 1 , 4 2 - 4 4 4 0 2 9 3 1 3 9 3 3 - 3 5 2 , 1 2 - 1 6 , 3 0 , 3 8 , 4 1 , 4 5 , 4 6 3 6 3 7 1 7 - 2 8 , 4 7 v i n f b o u t e n f r e q c o m p 4 . 5 ~ 5 0 v @ 5 0 0 k h z c 1 r 1 g n d c 2 m p m 3 5 3 0 p g a g n d v d d r 2 r 3 c 3 - 5 v @ 3 a 2 . 2 n f 2 . 5 3 k 1 0 k 2 . 5 k 2 x 2 2 f 4 . 7 f r 5 1 0 0 k r 4 1 m r 6 1 0 2 k 1 0 f s y s t e m g n d c 4 i c g n d 1 , 4 2 - 4 4 4 0 2 9 3 1 3 9 3 3 - 3 5 2 , 1 2 - 1 6 , 3 0 , 3 8 , 4 1 , 4 5 , 4 6 3 6 3 7 1 7 - 2 8 , 4 7 v i n f b o u t e n f r e q c o m p 4 . 5 - 5 5 v @ 8 0 0 k h z c 1 r 1 g n d c 2 m p m 3 5 3 0 p g a g n d v d d r 2 r 3 c 3 1 2 v @ 3 a 2 . 2 n f 2 . 5 3 k 1 0 k 9 1 0 r 2 x 2 2 f 4 . 7 f r 5 1 0 0 k r 4 1 m r 6 6 3 . 4 k 1 , 4 2 - 4 4 4 0 2 9 3 1 3 9 3 3 - 3 5 2 , 1 2 - 1 6 , 3 0 , 3 8 , 4 1 , 4 5 , 4 6 3 6 3 7 1 7 - 2 8 , 4 7
MPM3530 C 55v , 3a , step - down power module MPM3530 rev. 1.0 www.monolithicpower.com 19 9/21/2018 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. typical application circuits (continued) figure 7 : two - p hase p ara llel c onnection typical application circuit v i n f b o u t e n f r e q c o m p 4 . 5 - 5 5 v r 1 g n d m p m 3 5 3 0 p g a g n d v d d r 2 r 3 c 3 3 . 3 v @ 5 a 2 . 2 n f 2 . 5 3 k 1 0 k 9 1 0 r r 5 1 0 0 k r 4 1 m r 6 6 3 . 4 k 1 , 4 2 - 4 4 4 0 2 9 3 1 3 9 3 3 - 3 5 2 , 1 2 - 1 6 , 3 0 , 3 8 , 4 1 , 4 5 , 4 6 3 6 3 7 1 7 - 2 8 , 4 7 s w r 7 n s c 2 2 x 2 2 f c 1 4 . 7 f c 4 n s s s b s t 3 2 3 4 - 1 1 v i n f b o u t e n f r e q c o m p 4 . 5 - 5 5 v r 1 g n d m p m 3 5 3 0 p g a g n d v d d r 2 r 3 c 3 3 . 3 v @ 5 a 2 . 2 n f 2 . 5 3 k 1 0 k 9 1 0 r r 5 1 0 0 k r 4 1 m r 6 6 3 . 4 k 1 , 4 2 - 4 4 4 0 2 9 3 1 3 9 3 3 - 3 5 2 , 1 2 - 1 6 , 3 0 , 3 8 , 4 1 , 4 5 , 4 6 3 6 3 7 1 7 - 2 8 , 4 7 s w r 7 n s c 1 4 . 7 f c 4 n s s s b s t 3 2 3 4 - 1 1 2 x 2 2 f c 2 p w m s y n c g e n e r a t o r 5 0 0 k - 8 0 0 k h z s y n c i n p v d d s y n c i n n
MPM3530 C 55v , 3a , step - down power module 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 p roducts into any application. mps will not assume any legal responsibility for any said applications. MPM3530 rev. 1.0 www.monolithicpower.com 20 9/21/2018 mps proprietary information. patent protected . u nauthorized photocopy and duplication prohibited. ? 2018 mps. all rights reserved. package information qfn - 47 ( 1 0mm x 1 2 mm x 4 mm ) s i d e 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 ) l e a d c o p l a n a r i t y s h a l l b e 0 . 1 0 m i l l i m e t e r s m a x . 3 ) j e d e c r e f e r e n c e i s m o - 2 2 0 . 4 ) d r a w i n g i s n o t t o s c a l e . p i n 1 i d m a r k i n g t o p v i e w p i n 1 i d i n d e x a r e a r e c o m m e n d e d l a n d p a t t e r n b o t t o m v i e w p i n 1 i d 0 . 4 0 x 4 5 t y p . 0 . 4 0 x 4 5

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