mp3351 60v, 2a integrated photo flash charger with igbt driver mp3351 rev. 0.91 www.monolithicpower.com 1 9/2/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. the future of analog ic technology description the mp3351 is a fast, highly efficient, precision high voltage photo-flash charger with integrated igbt driver for xenon flash applications. the programmable peak current from 300ma to 2a. a 200m ? internal power switch minimizes the conduction loss. 60v maximum output voltage lowers the transformer turns ratio and improves switching loss associated with the primary leakage inductance. external feedback provides 3% charge accuracy. the mp3351 is available in a 16-pin 3mm x 3mm qfn package features ? integrated 60v, 200m ? power switch ? operates from a single or duel-cell li+ battery ? 2a peak current w/resistor program ? 3% charge accuracy ? integrated igbt driver 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 3-6v rdyb gnd pgnd fb charge sw iset 3, 6 15 14 10, 11 5 1 12, 13 7, 8 2, 4 16 9 vbatt 1.3v-9v t1 igbtin igbtout n/c v in + - v out igbt mp3351 single or dual cell battery
mp3351 ? 60v, 2a integrated photo flash charger with igbt driver mp3351 rev. 0.91 www.monolithicpower.com 2 9/2/2008 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 MP3351DQ qfn16-3 ?40 c to +85 c * for tape & reel, add suffix ?z (eg. MP3351DQ?z) for rohs compliant packaging, add suffix ?lf (eg. MP3351DQ?lf?z) absolute maximum ratings (1) v in to gnd ........................................ -0.3v to 6v charge, iset, igbtin, rdyb 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 (3mm x 3mm) ............. 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, t a = +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, hysteres is = 200mv 2.7 2.8 2.9 v v in quiescent current v(char ge)=high, v(sw) = 0, free run by t onmax 2.5 5 ma v in quiescent current v(charge)=high, v(fb) = 1.3v 50 a shutdown current from v in v(charge)=low, v in =3.3v 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 100 k ? i peak1 r set =43.1k ? 1.08 1.20 1.32 a i peak2 r set =100k ? 0.3 0.5 0.7 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
mp3351 ? 60v, 2a integrated photo flash charger with igbt driver mp3351 rev. 0.91 www.monolithicpower.com 3 9/2/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. electrical characteristics (continued) (v in =v (charge)=3.3v, t a = +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 50 80 120 s thermal shutdown rising edge, hysteresis = 15 o c 150 o c igbt driver igbtout pull-up on resistance 4 ? igbtout pull-down on resistance 4 ? 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 60 ns igbtout fall time c gate =6500pf 70 ns pull down resistance of igbtin 100k ? pin functions pin# name description 1 iset peak current set input. the peak current is 5 x10 4 the current flow out of this pin. 2, 4 gnd analog ground. tie it directly to local ground plane. 3, 6 vin input supply pin. connect it to system supply voltage. bypass vin to gnd with a 0.1uf or greater ceramic capacitor. 5 igbtout output drive for igbt gate. conn ect this pin to the gate of the igbt. 7, 8 pgnd, exposed pad power ground. ground connection for the power switch. connect exposed pad to pgnd. 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 agai n. bring this pin low will terminate the power delivery and put the part in shutdown. 12, 13 sw switch pin. this is the dr ain of the internal power switch. 14 igbtin logic input pin for igbt drive. 15 rdyb open-drain power-ready output. rdyb bec omes low when the output voltage is reached. 16 fb feedback pin. its trip voltage is 1.2v.
mp3351 ? 60v, 2a integrated photo flash charger with igbt driver mp3351 rev. 0.91 www.monolithicpower.com 4 9/2/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics v out = 300v, i set = 2a, t a = +25oc, unless otherwise noted. 50 250 100 300 150 200 2 6 37 45 26 37 45 6 37 4 5 0 1
mp3351 ? 60v, 2a integrated photo flash charger with igbt driver mp3351 rev. 0.91 www.monolithicpower.com 5 9/2/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. typical performanc e characteristics (continued) v out = 300v, i set = 2a, t a = +25oc, unless otherwise noted. flash
mp3351 ? 60v, 2a integrated photo flash charger with igbt driver mp3351 rev. 0.91 www.monolithicpower.com 6 9/2/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. block diagram igbt out figure 1?functional block diagram
mp3351 ? 60v, 2a integrated photo flash charger with igbt driver mp3351 rev. 0.91 www.monolithicpower.com 7 9/2/2008 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2008 mps. all rights reserved. application information mp3351 controlled flyback charger operates in critical conduction mode with peak current set by iset pin. output voltage is divided down through r1, r2 and r3 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. a minimum t off of 20 s provides a minimum off time at the beginning of charging when dcm comparator always trips because v out is still near zero, min t off will be reduced to 400ns after v o >16v. 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 r1, r2 and r3. 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: lim charge in out i t 1n vv + setting peak charge current mp3351?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 2a peak charge current, rset is 24.9k ? . primary inductance the primary inductance is calculated based on the minimum off time period: out min,off primary peak vt l ni v out : output voltage about 300v t min, off : minimum off time 400nsec. i peak : primary peak current turns ratio the minimum turns ratio of the flyback transformer is obtained as: out ds in v n vv ? v ds : fet drain-source voltage v in : input voltage 3~5v setting output voltage the output voltage is set by selecting the resistive voltage divider ratio. if we use 1.2k for ? the low side resistor (r3) of the voltage divider, we can determine the high side resistor (r1, r2) by the equation: out fb fb vv 1 r1 r2 r3 2v ? == typical values are r1=r2=150k ? ? and r3=1.2k ? . output diode selection the reverse voltage of the output diode is determined by: dout in vv nv = +
mp3351 ? 60v, 2a integrated photo flash charger with igbt driver 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 when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp3351 rev. 0.91 www.monolithicpower.com 8 9/2/2008 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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