MP3352 60v, 2.5a integrated photo flash charger with igbt driver and quench MP3352 rev. 0.9 www.monolithicpower.com 1 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. the future of analog ic technology description the MP3352 is a fast, highly efficient, precision high-voltage photo-flash charger with integrated igbt driver for xenon flash applications. the programmable peak current is up to 2.5a to ensure fast charging time. a 200m ? internal power switch minimizes the conduction loss. in addition, a 60v maximum voltage lowers the transformer turns ratio and improves the switching loss associated with the primary leakage inductance. external feedback provides 3% charge accuracy. the MP3352 is available in a 16-pin 3mm x 3mm qfn package. features ? integrated 60v, 200m ? power switch ? programmable peak current up to 2.5a ? 3% charge accuracy ? <1ua shutdown current ? integrated igbt driver ? integrated quench feature applications ? digital still cameras ? optical film cameras ? mobile phones with camera ? pdas with camera ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application MP3352 sw rdyb sw fb iset igbtout qref qsns gnd nc nc igbtin pgnd pgnd charge vin d1 d2 600v/1a fgr15n40a t1a t2 tp8 vin chag rdyb qref qsns agnd igbtin + r13 10k r9 33.2k
MP3352 ? 60v, 2.5a integrated photo fla sh charger with igbt driver and quench MP3352 rev. 0.9 www.monolithicpower.com 2 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. package reference 1 2 3 4 13 14 15 16 8 7 6 5 12 11 10 9 part number* package temperature MP3352dq qfn16-3 ?40 c to +85 c * for tape & reel, add suffix ?z (e.g. MP3352dq?z) for rohs compliant packaging, add suffix ?lf (e.g. MP3352dq?lf?z) absolute maxi mum ratings (1) v in to gnd ........................................ -0.3v to 6v charge, iset, igbtin, rdyb, qref, qsns to gnd.............................................. -0.3v to 6v fb to gnd ........................................ -0.3v to 6v sw to gnd ..................................... -0.3v to 60v maximum operating frequency .............400khz operating temperature ranges: -40c to +85c storage temperature ...............-55c to +150c junction temperature.............................+150c lead temperature (solder) ....................+260c thermal resistance (2) ja jc qfn16 (3mmx3mm) ............... 50 ...... 12... c/w notes: 1) exceeding these ratings may damage the device. 2) measured on approximately 1? square of 1 oz copper. electrical characteristics (v in =v (charge)=3.3v, ta = +25c, unless otherwise noted.) parameter conditions min typ max unit photoflash capacitor charger v in voltage range 3 6 v v in uvlo rising edge, hysteresis = 200mv 2.7 2.8 2.9 v v in quiescent current v(charge)=high, v(sw) = 0, free run by t onmax 1 2 ma v in quiescent current charge complete, v(charge)=high, v(fb) = 1.3v 50 a shutdown current from v in v(charge)=low 1 a v sw leakage current v in =3.3v,v sw =60v, in shutdown 2 a sw on resistance between sw and gnd switch turn-on 0.2 ? charge input high voltage 2.4 v charge input low voltage 0.6 v pull-down resistance of charge pin v(charge)=3.3v 100k ? i peak1 r set =33.2k ? 1.36 1.51 1.66 a i peak2 r set =100k ? 0.4 0.5 0.6 a charge completion detect voltage at fb 1.176 1.20 1.224 v fb input bias current i(fb) -0.2 0.2 a dcm comparator threshold with 1.2k ? (1%) connected to fb 15 25 35 mv
MP3352 ? 60v, 2.5a integrated photo fla sh charger with igbt driver and quench MP3352 rev. 0.9 www.monolithicpower.com 3 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. electrical characteristics (continued) (v in =v (charge)=3.3v, ta = +25c, unless otherwise noted.) parameter conditions min typ max unit rdyb leakage current v(rdyb)=3.3v 1 a rdyb output low voltage i sink = 2ma 0.2 v max t on maximum t on time 45 75 105 s thermal shutdown rising edge, hysteresis = 15 o c 150 o c qref input current q ref =0.2v to 1.2v -0.1 0.1 a qsns-qref offset voltage q ref =0.2v to 1.2v -50 50 mv qsns input current q ref =0.2v to 1.2v -0.1 0.1 a qsns to igbt delay q ref =0.2v to 1.2v 2 s igbt driver igbtout pull-up on resistance 5 ? igbtout pull-down on resistance 5 ? igbtin input high voltage 2.4 v igbtin input low voltage 0.6 v propagation delay igbtin rising/falling edge to igbtout rising/falling edge, c gate =6500pf 45 ns igbtout rise time c gate =6500pf,20% to 80% 60 ns igbtout fall time c gate =6500pf,20% to 80% 70 ns pull down resistance of igbtin 100k ? pin functions pin # name function 1 iset peak current set input. the peak current is 5 x10 4 the current flow out of this pin. 2 gnd analog ground. tie it directly to local ground plane. 3 qref quench reference input. 4 qsns quench sense input from light sensor. 5 igbtout output drive for igbt gate. connect this pin to the gate of the igbt. 6 vin input supply pin. connect it to system supply voltage. bypass vin to gnd with a 2x10f or greater ceramic capacitor. 7, 8 pgnd power ground. ground connection for the power switch. 9 charge charge enable pin. a low-to-high transition on this pin puts the part into power delivery mode. once the target voltage is reached, the part will stop charging the output. toggle this pin will start charging again. bring this pin low will terminate the power delivery and put the part in shutdown. 10, 11 n/c no connect 12, 13 sw switch pin. this is the drain of the internal power switch. 14 igbtin logic input pin for igbt drive. 15 rdyb open-drain power-ready output. rdyb goes low when the output voltage is reached. 16 fb feedback pin. trip voltage is 1.2v.
MP3352 ? 60v, 2.5a integrated photo fla sh charger with igbt driver and quench MP3352 rev. 0.9 www.monolithicpower.com 4 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics t a = +25 c, unless otherwise noted. v out 50v/div. v out 100v/div. v out 50v/div. v sw 20v/div. v charge 5v/div. v rdby 5v/div. v sw 20v/div. i inductor 2a/div. i in 500ma/div. v out 100v/div. v charge 5v/div. v rdby 5v/div. i in 500ma/div. v out 100v/div. v charge 5v/div. v rdby 5v/div. i in 500ma/div. v out 100v/div. v charge 5v/div. v rdby 5v/div. i in 500ma/div. i inductor 2a/div. switching waveform v cc =v in =3.3v,v out =300v,i set =2.5a charging waveform c out =47 f,v cc =v in =3.3v,v out =300v,i set =2.5a charging waveform c out =47 f,v cc =v in =5v,v out =300v,i set =2.5a charging waveform c out =100 f,v cc =v in =5v,v out =300v,i set =2.5a charging waveform c out =100 f,v cc =v in =3.3v,v out =300v,i set =2.5a v cc =v in =5v,v out =300v,i set =2.5a switching waveform 200ms/div 200ms/div 400ms/div 400ms/div
MP3352 ? 60v, 2.5a integrated photo fla sh charger with igbt driver and quench MP3352 rev. 0.9 www.monolithicpower.com 5 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics (continued) t a = +25 c, unless otherwise noted. charge time (s) line regulation (%) output voltage (v) efficiency (%) 2.0 3.0 4.0 5.0 6.0 7.0 50 100 150 200 250 300 input voltage (v) 2.0 3.0 4.0 5.0 6.0 7.0 input voltage (v) 2.0 292 294 296 298 300 290 3.0 4.0 5.0 6.0 7.0 input voltage (v) output voltage (v) charge time vs. input voltage line regulation (%) flash current v out vs. v in efiiciency at i set =2.5a 0 -1.00 -0.50 0.00 0.50 1.00 0.5 40 45 50 55 60 65 70 75 80 85 1.0 1.5 2.0 2.5 v in =6v v in =3v v in =4.5v v out =300v v igbtout 2v/div. v igbtin 2v/div. v out 100v/div. i flash 50a/div.
MP3352 ? 60v, 2.5a integrated photo fla sh charger with igbt driver and quench MP3352 rev. 0.9 www.monolithicpower.com 6 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. test circuits -- + -- + -- + q q r s driver 1v v in v in v in rdyd igbtin qref qsns iset igbt in igbt out r i-lim 80 s delay dcm 10mv one shot 1.2v 1v bandgap, thermal shutdown & por pgnd sw iset agnd fb fb 1.2v full charge q qr s 50 m ? 100k ? figure 1?functional block diagram
MP3352 ? integrated photo flash charger and igbt driver MP3352 rev. 0.9 www.monolithicpower.com 7 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. application information MP3352 controlled flyback charger operates in critical conduction mode with peak current set by iset pin. output voltage is divided down through r1, r2 from the positive terminal of the transformer secondary and compares with 1.20v at fb pin. the low to high transition of charge pin will enable the flyback converter to switch. charger may enter dcm mode when charge is close to full and actual off time is less than minimum t off . circuit will stop switching and rdyb will be pulled low once the flash capacitor is charged to 300v, a value set by r2, r5, and r8. when the part is ready the internal dissipation is reduced to just the circuits for igbt driver. toggle charge pin will start charge again. bringing charge pin low terminates the power delivery and put the part in shutdown. a maximum t on timer prevents pulling current from starved power source. if the on time exceeds maximum t on , the switch is forced off regardless of i peak detection. integrated igbt driver uses v in as its power supply. dcm comparator dcm boundary is reached when v (fb) drops to zero. the dcm comparator compares v (fb) and a fixed offset voltage of 25mv to account for the comparator delay. charge speed the output capacitor charging speed is determined by: out in lim charge v n v 1 i t + setting peak charge current MP3352?s peak charge current (i set ) can be set by an external resistor, r set from the iset pin to ground. the value of r set can be calculated from: set set 50 r(k) i(a) ?= for example, for 2.5a peak charge current, r set is 20k ? . primary inductance the primary inductance is calculated based on the minimum off time period: peak off min, out primary ni t v l v out : output voltage about 300v t min-off minimum off time 300ns. i peak : primary peak current turns ratio the minimum turns ratio of the flyback transformer is obtained as: in ds out v v v n ? v ds : fet drain-source voltage v in : input voltage 3~5v table 1?recommended transformer table part number description size (lwh) vendor ttrn-038s t-19-060 1:8, lprimary = 6 h, for i lim = 2.5 amax 6.4mm7.7mm4.0mm tokyo coil 750310448 1:8, lprimary = 6 h, for i lim = 2.5 amax 7mm10mm5mm wurth electronics ldt565630t-042 1:8, lprimary = 6 h, for i lim = 2a only 5.8mm5.8mm3mm tdk
MP3352 ? integrated photo flash charger and igbt driver MP3352 rev. 0.9 www.monolithicpower.com 8 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. setting output voltage the output voltage is set by selecting the resistive voltage divider ratio. if we use 1.2k ? ? the low side resistor (r8) of the voltage divider, we can determine the high side resistor (r2, r5) by the equation: out fb 25 8 fb vv 1 rr r 2v ? == typical values are r2=r5=150k ? ? and r8=1.2k ? . output diode selection the reverse voltage of the output diode is determined by: in out d nv v v + = quench function MP3352 has build-in quench function to accurately control exposure time and preserve power, thus to extend battery life. when output capacitor is fully charged and igbtin (pin14) is set high, internal igbt driver drives the gate of igbt high and fires the flash strobe. once the photo transistor gets the flash light, it starts to charge c and the voltage of c represents the total exposure. igbt will be off when the voltage on c exceeds the control voltage on qref (pin3) MP3352 sw rdyb sw fb iset igbtout qref qsns gnd nc nc igbtin pgnd pgnd charge vin v cc control voltage photo transistor c 6 9 15 3 4 2 10 11 7 8 14 5 1 16 13 12 typical application circuit MP3352 vin charge xenon flash rdyb qref qsns gnd pgnd pgnd igbtin igbtout iset fb sw sw nc nc t1 t2 q2 q1 vin chag rdyb qref qsns igbtin vcc 6 9 15 3 4 2 10 11 7 8 14 5 1 16 13 12 + figure 2?application circuit for 2 cell li-ion battery photo flash charger
MP3352 ? 60v,2.5a integrated photo flash charger with igbt driver and quench notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP3352 rev. 0.9 www.monolithicpower.com 9 11/12/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. package information qfn16-3(exposed pad) side view top view 1 16 13 12 9 8 5 4 bottom view 2.90 3.10 1.50 1.80 2.90 3.10 1.50 1.80 0.50 bsc 0.18 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id marking 1.70 0.50 0.25 recommended land pattern 2.90 note: 1) all dimensions are in millimeters. 2) exposed paddle size does not include mold flash. 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing conforms to jedec mo-220, variation veed-4. 5) drawing is not to scale. pin 1 id see detail a pin 1 id option a 0.30x45? typ. pin 1 id option b r0.20 typ. detail a pin 1 id index area 0.70 0.30 0.50
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