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1 ds9917-03 april 2011 www.richtek.com RT9917 pin configurations 7 channel dc/dc converters general description the RT9917 is a complete power-supply solution for digital still cameras and other hand-held devices. it integrates : ch1 : boost dc -dc converter with load disconnect controller (sw1). ch2 : selectable boost/buck dc-dc converter ch3 : step-down dc-dc converter with internal compensation. ch4 : step-down dc-dc converter with internal compensation. ch5 : dc/dc converter with hv nmos, internal compensation and load disconnect (sw5) for ccd positive supply. ch6 : dc/dc converter with hv pmos for ccd negative supply. ch7 : wled driver with hv nmos, internal compensation and allow for pwm dimming. sw1 : load disconnect controller for ch1. sw5 : load disconnect switch for ch5. features z z z z z 1 channel boost/buck selectable by sel pin z z z z z 2 selectable on/off sequence set by seq pin z z z z z 4 channels with internal compensation z z z z z provide charge pump voltage to enhance nmos gate driving capability for alkaline battery input z z z z z all power switches integrated z z z z z syn step-down dc/dc converter ` ` ` ` ` up to 95% efficiency ` ` ` ` ` 100% (max) duty cycle z z z z z syn step-up dc/dc converter ` ` ` ` ` adjustable output voltage ` ` ` ` ` up to 95% efficiency z z z z z open led protection z z z z z transformerless inverting converter for ccd z z z z z fixed 1mhz switching frequency z z z z z compact 40-lead wqfn package z z z z z rohs compliant and 100% lead (pb)-free ordering information note : richtek products are : ` rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ` suitable for use in snpb or pb-free soldering processes. applications z digital still camera z pda z portable device (top view) wqfn-40l 5x5 30 29 28 27 26 25 24 23 22 21 31 32 33 34 35 36 37 38 39 40 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 pvdd2 vddm cfb7 gnd lx7 lx5 vout7 fb3 en7 lx3 pvdd1 pvdd6 cp cn cpo fb6 fb4 comp6 lx4 pvdd4 sw5o sw5i fb5 vref sel seq en6 pvdd3 en134 comp1 fb1 ok134 vout1 fb2 comp2 en2 lx2 gnd lx6 en5 lx1 41 RT9917 package type qw : wqfn-40l 5x5 (w-type) lead plating system p : pb free g : green (halogen free and pb free)
2 ds9917-03 april 2011 www.richtek.com RT9917 typical application circuit timing diagram for li-ion : ch2 3.3v is from v out of ch1 power on sequence : ch1 boost 5v ch3 buck 2.5v ch4 buck 1.8v ch2 buck 3.3v power off sequence : ch2 buck 3.3v ch4 buck 1.8v ch3 buck 2.5v ch1 boost 5v 5v pvdd1 fb2 ok134 fb1 lx2 pvdd2 gnd sw5o sw5i lx5 36 31 20 30 15 25 RT9917 10uf/25v v bat fb5 150k 3.3v 10uf 5v pvdd3 13 14 c1 c3 c8 r1 l5 l4 4.7uh 10uh vout1 10uf x 2 comp1 comp2 v bat lx3 21 l2 4.7uh 10uf c5 2.5v fb3 23 11 pvdd4 lx4 10 l3 4.7uh 10uf c7 1.8v fb4 8 1nf c9 16v l7 10uh 68k 10.5k 4.7uf/16v -8v 0.1uf 2 lx6 7 fb6 16 vref 9 comp6 75k 1nf 22 en7 dimming en134 en2 en5 en6 off on 4 cp 5 cn 6 cpo 12 19 27 32 33 38 34 35 37 39 c4 c6 c12 c13 c14 r3 r4 r5 r6 r7 r8 r10 r11 r12 10uf/25v c24 887k 75k 47pf c11 4.7pf c15 470k r13 88.7k r14 39k r15 560pf c16 10uf c17 470k r16 150k r17 15k r18 2.2nf c19 10pf c18 10uf c20 768k 360k 22pf v bat 10uf c21 470k 374k 33pf 18 seq 17 sel v bat 26 24 28 v bat lx7 vout7 cfb7 1uf/16v c10 10 r9 l6 d1 d2 d3 10uh d4 pvdd6 3 v bat power on lx1 1 40 vddm v bat l1 2.2uh 29 1uf 10uf 1uf 1uf 1uf c24 c25 c26 c27 vddm en134, en2 ch1 v out 5v ch3 v out 2.5v ch4 v out 1.8v ch2 v out 3.3v wait until fb3 < 0.1v ic shutdown 3.5ms user define wait until fb4 < 0.1v wait until fb2 < 0.1v 3.5ms 3.5ms 3.5ms
3 ds9917-03 april 2011 www.richtek.com RT9917 timing diagram power on sequence : ch1 boost 5v ch3 buck 2.5v ch4 buck 1.8v ch2 buck 3.3v power off sequence : ch2 buck 3.3v ch4 buck 1.8v ch3 buck 2.5v ch1 boost 5v for li-ion : ch2 3.3v is from v bat 5v fb2 ok134 fb1 lx2 pvdd2 gnd sw5o sw5i lx5 1 36 31 20 30 15 25 RT9917 v bat fb5 150k 3.3v 10uf pvdd3 13 14 c1 c3 c8 r1 l5 l4 4.7uh 10uh vout1 10uf x 2 comp1 comp2 v bat lx3 21 l2 4.7uh 10uf c5 2.5v fb3 23 11 pvdd4 lx4 10 l3 4.7uh 10uf c7 1.8v fb4 8 1nf c9 16v l7 10uh 68k 10.5k 4.7uf/16v -8v 0.1uf 2 lx6 7 fb6 16 vref 9 comp6 75k 1nf 22 en7 dimming en134 en2 en5 en6 off on 4 cp 5 cn 6 cpo 12 19 27 32 33 38 34 35 37 39 c4 c6 c12 c13 c14 r3 r4 r5 r6 r7 r8 r10 r11 r12 10uf/25v c24 887k 75k 47pf c11 4.7pf c15 470k r13 88.7k r14 39k r15 560pf c16 10uf c17 470k r16 150k r17 15k r18 2.2nf c19 10pf c18 10uf c20 768k 360k 22pf v bat 10uf c21 470k 374k 33pf 18 seq 17 sel v bat 26 24 28 v bat lx7 vout7 cfb7 1uf/16v c10 10 r9 l6 d1 d2 d3 10uh d4 pvdd6 3 v bat power on v bat pvdd1 lx1 40 vddm v bat l1 29 1uf 10uf 2.2uh 1uf 10uf/25v 1uf 1uf c24 c25 c26 c27 vddm en134, en2 ch1 v out 5v ch3 v out 2.5v ch4 v out 1.8v ch2 v out 3.3v wait until fb3 < 0.1v ic shutdown 3.5ms user define wait until fb4 < 0.1v wait until fb2 < 0.1v 3.5ms 3.5ms 3.5ms
4 ds9917-03 april 2011 www.richtek.com RT9917 timing diagram for 2aa note : a schottky diode connect from lx1 to pvdd1 is required for low-voltage start up. power on sequence : ch1 boost 3.3v ch3 buck 2.5v ch4 buck 1.8v (ch2 boost 5v and sw1 3.3v) power off sequence : (ch2 boost 5v and sw1 3.3v) ch4 buck 1.8v ch3 buck 2.5v ch1 boost 3.3v 3.3v pvdd1 fb2 ok134 fb1 pvdd2 lx1 gnd sw5o sw5i lx5 1 40 36 20 30 15 25 RT9917 v bat fb5 vddm v bat 1m 10ufx2 5v pvdd3 13 14 c1 c3 c8 r1 l1 l5 q1 2.2uh 10uh vout1 10uf comp1 comp2 3.3v lx3 21 l2 4.7uh 10uf c5 2.5v fb3 23 11 pvdd4 lx4 10 l3 4.7uh 10uf c7 1.8v fb4 8 1nf c9 16v l7 10uh 68k 10.5k 4.7uf/16v -8v 0.1uf 2 lx6 7 fb6 16 vref 9 comp6 75k 1nf 22 en7 dimming en134 en2 en5 en6 off on 4 cp 5 cn 0.1uf 6 cpo 12 19 27 29 32 33 38 34 35 37 39 c4 c6 c12 c13 c14 c15 c16 r3 r4 r5 r6 r7 r8 r10 r11 r12 10uf/25v c24 887k 75k 47pf c11 4.7pf c17 470k r13 150k r14 39k r15 560pf c18 10uf c19 470k r16 88.7k r17 39k r18 560pf c21 10uf c22 768k 360k 22pf 3.3v 10uf c23 470k 374k 33pf 18 seq 17 sel v bat 26 24 28 v bat lx7 vout7 cfb7 1uf/16v c10 10 r9 l6 d1 d2 d3 10uh d4 pvdd6 3 v bat 1uf ao3415 lx2 31 v bat l4 2.2uh 3.3v v out power on 1uf 10uf 1uf 10uf/25v 1uf 1uf c24 c25 c26 c27 vddm en134, en2 ch1 v out 3.3v ch3 v out 2.5v ch4 v out 1.8v v out1 3.3v wait until fb4 < 0.1v wait until v out1 < 0.4v wait until fb3 < 0.1v ic shutdown ch2 v out 5v depends on loading user define 3.5ms 3.5ms 3.5ms 3.5ms 3.5ms
5 ds9917-03 april 2011 www.richtek.com RT9917 channel ch3 formula v out = (1+r3/r4) x 0.8 v out (v) 2.5 1.8 1.3 1.2 1.0 l(uh) 4.7 4.7 4.7 4.7 4.7 r3(k ? ) 768 470 237 187 23.2 r4(k ? ) 360 374 374 374 93.1 c4(pf) 22 33 68 82 47 c out (uf) 10 10 10 10 10 ? channel ch4 formula v out = (1+r5/r6) x 0.8 v out (v) 2.5 1.8 1.3 1.2 1.0 l(uh) 4.7 4.7 4.7 4.7 4.7 r5(k ? ) 768 470 237 187 23.2 r6(k ? ) 360 374 374 374 93.1 c6(pf) 22 33 68 82 47 c out (uf) 10 10 10 10 10 ? channel ch5 formula v out = (1+r7/r8) x 1.25 v out (v) 12 13 15 15.5 16 l(uh) 10 10 10 10 10 r7(k ? ) 820 820 1000 820 886 r8(k ? ) 95.3 86.6 90.9 71.5 75 c9(pf) 1000 1000 1000 1000 1000 c out (uf) 10/16v 10/16v 10/25v 10/25v 10/25v ? channel ch6 formula v out = (r10/r11)*(-1.25) * r10+r11 <90k v out (v) -6 -6.3 -7 -7.5 -8 l(uh) 10 10 10 10 10 r10(k ? ) 57.6 69.8 63.4 68 68 r11(k ? ) 12 13.7 11.3 11.3 10.5 c out (uf) 10/16v 10/16v 4.7/16v 4.7/16v 4.7/16v r12(k ? ) 47 47 75 75 75 c11(pf) 47 47 47 47 47 c14(pf) 1000 1000 1000 1000 1000 ?
6 ds9917-03 april 2011 www.richtek.com RT9917 functional pin description pin no. pin name pin function 1 pvdd1 power input pin for ch1. 2 lx6 switch node of ch6. high impedance in shutdown. 3 pvdd6 power input pin for ch6. 4 cp charge pump external driver pin. 5 cn charge pump external driver pin. 6 cpo output pin for charge pump. 7 fb6 feedback input pin for ch6. high impedance in shutdown. 8 fb4 feedback input pin for ch4. high impedance in shutdown. 9 comp6 compensation pin for ch6. pull to gnd in shutdown. 10 lx4 switch node for ch4. high impedance in shutdown. 11 pvdd4 power input pin for ch4. 12 en5 enable pin for ch5. 13 sw5o output pin for ch5 load disconnect. 14 sw5i input pin for ch5 load disconnect. 15 fb5 feedback input pin for ch5. high impedance in shutdown. 16 vref 1.25v reference output pin. 17 sel ch2 boost/buck select pin. logic state can?t be changed during operation. 18 se q ch1, ch3, ch4 power on/off sequence setting pin. logic state can?t be changed during operation. 19 en6 enable pin for ch6. 20 pvdd3 power input pin for ch3 21 lx3 switch node for ch3. high impedance in shutdown. 22 en7 enable pin for ch7. 23 fb3 feedback input pin for ch3. high impedance in shutdown. 24 vout7 sense pin for ch7 output voltage. 25 lx5 switch node for ch5. high impedance in shutdown. 26 lx7 switch node for ch7. high impedance in shutdown. 27, 41 (exposed pad) gnd analog gnd pin. the exposed pad must be soldered to a large pcb and connected to gnd for maximum thermal dissipation. 28 cfb7 feedback input pin for ch7. 29 vdd m ic analog input power pin. this voltage is also used to drive power nmos gate of ch5 and ch7. 30 pvdd2 power input pin for ch2. 31 lx2 switch node for ch2. high impedance in shutdown. 32 en2 enable pin for ch2 33 comp2 compensation pin for ch2 34 fb2 feedback input pin for ch2. high impedance in shutdown. 35 vout1 sense pin for ch1 output voltage. high impedance in shutdown. 36 ok134 external switch control pin. high impedance in shutdown. 37 fb1 feedback input pin for ch1. high impedance in shutdown. 38 comp1 compensation pin for ch1. pull to gnd in shutdown. 39 en134 enable pin for ch1, ch3, ch4, sw 1. 40 lx1 switch node for ch1. high impedance in shutdown.
7 ds9917-03 april 2011 www.richtek.com RT9917 function block diagram timing diagram ch5 and ch6 timing diagram ch1 c-mode step-up + - 0.8v ref ch2 c-mode step-up or step-down + - 0.8v ref ch3 c-mode step-down + - 0.8v ref ch5 c-mode step-up pwm + - 1.25v ref oscillator soft start ok134 vout7 fb5 lx5 sw5i vddm gnd fb1 comp1 lx1 lx2 fb3 pvdd3 pvdd1 comp2 pvdd2 fb2 lx3 sw5o ch6 c-mode inverting pvdd6 lx6 + - fb6 comp6 ch7 c-mode step-up pwm + - 0.25v ref cfb7 lx7 en7 lx4 fb4 ch4 c-mode step-down + - 0.8v ref pvdd4 enable mode sequence sel seq en134 en2 en5 en6 charge pump cp cn cpo ref sw1 controller + - vout1 1.25v ref vref thermal protect sw5o (to ccd +) en5 max 18ms sw5i en6 ch6 v out depends on loading depends on loading depends on loading max 18ms
8 ds9917-03 april 2011 www.richtek.com RT9917 electrical characteristics (v ddm = 3.3v, t a = 25 c, unless otherwise specified) absolute maximum ratings (note 1) z supply voltage, v ddm ------------------------------------------------------------------------------- 0.3v to 7v z power input pvdd1, pvdd2, pvdd3, pvdd4, pvdd6 ------------------------------------ ? 0.3v to 7v switch node : lx1, lx2, lx3, lx4 ----------------------------------------------------------------------------------- ? 0.3v to 7v lx5, lx7, sw5i, sw5o, vout7 ----------------------------------------------------------------- ? 0.3v to 21v lx6 ------------------------------------------------------------------------------------------------------- (pv dd6 ? 14v) to (pvdd6 + 0.3v) z the other pins ---------------------------------------------------------------------------------------- ? 0.3v to 7v z power dissipation, p d @ t a = 25 c wqfn 40l 5x5 ---------------------------------------------------------------------------------------- 2.778w z package thermal resistance (note 2) wqfn 40l 5x5, ja ---------------------------------------------------------------------------------- 36 c/w wqfn 40l 5x5, jc ---------------------------------------------------------------------------------- 7 c/w z junction temperature -------------------------------------------------------------------------------- 150 c z lead temperature (soldering, 10 sec.) ---------------------------------------------------------- 260 c z storage temperature range ---------------------------- ------------------------------------------- ? 65 c to 150 c z esd susceptibility (note 3) hbm (human body mode) ------------------------------------------------------------------------- 2kv mm (ma chine mode) --------------------------------------------------------------------------------- 200v recommended operating conditions (note 4) z supply voltage, v ddm ------------------------------------------------------------------------------- 2.7v to 5.5v z en7 dimming control frequency range for ch7 --------------------------------------------- 1khz to 100khz (avoid 2k to 20khz for audio noise) z junction temperature range ---------------------------- ------------------------------------------- ? 40 c to 125 c z ambient temperature range ---------------------------- ------------------------------------------- ? 40 c to 85 c parameter symbol test condition min typ max units supply voltage vddm minimum startup voltage v st -- -- 1.6 v vddm over voltage protection 5.6 6 6.5 v vddm over voltage protection hysteresis -- -- 0.6 v supply current shutdown supply current into vddm i off en134 = en2 = en5 = en 6 = en7 = 0v -- 1 10 ua ch1 (syn-boost) + sw1 : supply current into vddm i q1 non switching, en134 = 3.3v -- -- 800 ua ch2 (syn-boost or syn-buck) : supply current into vddm i q2 non switching, en2 = 3.3v -- -- 800 ua ch3 (syn-buck) : supply current into vddm i q3 non switching, en134 = 3.3v -- -- 800 ua to be continued
9 ds9917-03 april 2011 www.richtek.com RT9917 parameter symbol test condition min typ max units ch4 (syn-buck) : supply current into vddm i q4 non switching, en134 = 3.3v -- -- 800 ua ch5 (asyn-boost) + sw5 : supply current into vddm i q5 non switching, en5 = 3.3v -- -- 800 ua ch6 (inverting) + charge pump supply current into vddm i q6 non switching, en6 = 3.3v pvdd6 = 3.3v -- -- 800 ua ch7 (wled): supply current into vddm i q7 non switching, en7 = 3.3v -- -- 800 ua oscillator ch1,2,3,4,5,6,7 operating frequency f osc 900 1000 1100 khz ch1 maximum duty cycle (boost) v fb1 = 0.7v 80 83 86 % ch2 maximum duty cycle (boost) v fb2 = 0.7v 80 83 86 % ch2 maximum duty cycle (buck) v fb2 = 0.7v -- -- 100 % ch3 maximum duty cycle (buck) v fb3 = 0. 7v -- -- 100 % ch4 maximum duty cycle (buck) v fb4 = 0. 7v -- -- 100 % ch5 maximum duty cycle (boost) v fb5 = 1.15v 91 94 97 % ch6 maximum duty cycle (inverting) v fb6 = 0.1v 91 94 97 % ch7 maximum duty cycle (wled) c fb7 = 0.15v 91 94 97 % feedback regulation voltage feedback regulation voltage @ fb1, fb2, fb3, fb4 0.788 0.8 0.812 v feedback regulation voltage @ fb5 1.237 1.25 1.263 v feedback regulation voltage @ fb6 -15 0 15 mv feedback regulation voltage @ cfb7 0.237 0.25 0.263 v ok134 sink current ok134 = 1v -- 140 -- ua reference vref output voltage v ref 1.237 1.25 1.263 v vref load regulation 0 a < i ref < 200 a -- -- 10 mv power sw itch p-mosfet, pvdd1 = 3.3v -- 150 -- m ch1 on resistance of mosfet r ds(on) n-mosfet, pvdd1 = 3.3v -- 150 -- m ch1 current limitation (boost) n-mosfet, pvdd1 = 3.3v -- 3 -- a p-mosfet, pvdd2 = 3.3v -- 150 -- m ch2 on resistance of mosfet r ds(on) n-mosfet, pvdd2 = 3.3v -- 150 -- m ch2 current limitation (buck) p-mosfet, pvdd2 = 3.3v -- 1.5 -- a ch2 current limitation (boost) n-mosfet, pvdd2 = 3.3v -- 3 -- a p-mosfet, pvdd3 = 3.3v -- 200 -- m ch3 on resistance of mosfet r ds(on) n-mosfet, pvdd3 = 3.3v -- 200 -- m ch3 current limitation (buck) p-mosfet, pvdd3 = 3.3v -- 1.5 -- a to be continued
10 ds9917-03 april 2011 www.richtek.com RT9917 parameter symbol test condition min typ max units p-mosfet, pvdd4 = 3.3v -- 200 -- m ch4 on resistance of mosfet r ds(on) n-mosfet, pvdd4 = 3.3v -- 200 -- m ch4 current limitation (buck) p-mosfet, pvdd4 = 3.3v -- 1.5 -- a ch5 load disconnect mosfet p-mosfet, sw5i = 3.3v -- 0.5 -- ch5 on resistance of mosfet n-mosfet, vddm = 3.3v -- 0.5 -- ch5 current limitation n-mosfet, vddm = 3.3v -- 1.5 -- a ch6 on resistance of mosfet p-mosfet, pvdd6 = 3.3v -- 1 -- ch6 current limitation p-mosfet, pvdd6 = 3.3v -- 1.5 -- a ch7 on resistance of mosfet n-mosfet, vddm = 3.3v -- 0.5 -- ch7 current limitation n-mosfet, vddm = 3.3v -- 0.8 -- a protection over voltage protection of pvdd1 -- 6 -- v over voltage protection of pvdd2 -- 6 -- v under voltage protection of vout1 -- 1.75 -- v over voltage protection of sw5i -- 19 -- v over voltage protection of vout7 -- 19 -- v ch5 load disconnect uvp of sw5o -- 0.4 -- v control en134, en2, en5, en6, en7 input high level threshold -- 0.8 1.3 v en134, en2, en5, en6, en7 input low level threshold 0.4 0.8 -- v en134, en2, en5, en6, en7 sink current -- 2 6 ua seq sel input high level threshold 1.3 -- -- v seq sel input low level threshold -- -- 0.4 v seq sel sink current en134 or en2 or en5 or en6 or en7 = 3.3v -- 6 18 ua seq sel sink current en134 = en2 = en5 = en6 = en7 = 0v -- 0 0.1 ua thermal protection thermal shutdown t sd 125 160 -- c thermal shutdown hysteresis t sd -- 20 -- c note 1. stresses listed as the above ? absolute maximum ratings ? may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. note 2. ja is measured in the natural convection at t a = 25 c on a high effective four layers thermal conductivity test board of jedec 51-7 thermal measurement standard. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions.
11 ds9917-03 april 2011 www.richtek.com RT9917 ch4 buck efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 output current (ma) efficiency (%) ch3 buck efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 output current (ma) efficiency (%) ch2 boost efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 output current (ma) efficiency (%) ch1 boost efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 10 100 1000 output current (ma) efficiency (%) typical operating characteristics v out = 5v, l = 2.2 h, c out = 10 fx2 v in = 4.5v v in = 4.2v v in = 3.3v v in = 2.5v v in = 2.0v v in = 1.8v v out = 3.3v, l = 2.2 h, c out = 10 fx2 v in = 3.0v v in = 2.7v v in = 2.5v v in = 2.2v v in = 2.0v v in = 1.8v v out = 1.8v, l = 4.7 h, c out = 10 f v out = 2.5v, l = 4.7 h, c out = 10 f ch6 inverting efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 1 10 100 output current (ma) efficiency (%) v out = ? 8v, l = 10 h, c out = 10 f v in = 4.5v v in = 4.2v v in = 1.8v v in = 2.0v v in = 3.3v v in = 2.5v ch5 boost efficiency vs. output current 0 10 20 30 40 50 60 70 80 90 100 1 10 100 output current (ma) efficiency (%) v out = 15v, l = 10 h, c out = 10 f v in = 4.5v v in = 4.2v v in = 3.3v v in = 2.5v v in = 2.0v v in = 1.8v v in = 3.0v v in = 3.3v v in = 3.6v v in = 3.9v v in = 4.2v v in = 4.5v v in = 2.0v v in = 2.5v v in = 3.0v v in = 3.3v v in = 4.2v v in = 4.5v
12 ds9917-03 april 2011 www.richtek.com RT9917 ch7 efficiency vs. input voltage 0 10 20 30 40 50 60 70 80 90 100 1.522.533.544.55 input voltage (v) efficiency (%) i out = 20ma, l = 10 h, c out = 1 f ch1, ch2, ch3 and ch4 power on time (2.5ms/div) v out _ch1 (2v/div) seq = high, v in = 3.6v v out _ch2 (2v/div) v out _ch3 (2v/div) v out _ch4 (1v/div) ch1, ch2, ch3 and ch4 power off time (5ms/div) v out _ch1 (5v/div) seq = high, v in = 3.6v v out _ch2 (2v/div) v out _ch3 (2v/div) v out _ch4 (2v/div) ch1, ch2, ch3 and ch4 power off time (2.5ms/div) v out _ch1 (2v/div) seq = high, v in = 3.0v v out _ch2 (2v/div) v out _ch3 (2v/div) v out _ch4 (2v/div) sw1_3.3v (2v/div) ch1 sw1 ch2 ch3 ch4 ch1, ch2, ch3 and ch4 power on time (2.5ms/div) v out _ch1 (1v/div) seq = high, v in = 3.0v v out _ch2 (2v/div) v out _ch3 (2v/div) v out _ch4 (1v/div) sw1_3.3v (2v/div) ch1 sw1 ch2 ch3 ch4 ch1 output voltage ripple time (500ns/div) lx1 (2v/div) v in = 3v, v out = 5v, i out = 300ma l = 2.2 h, c out = 10 f x 2 v out_ac (5mv/div)
13 ds9917-03 april 2011 www.richtek.com RT9917 ch6 output voltage ripple time (500ns/div) lx6 (5v/div) v in = 1.8v, v out = -8v, i out = 50ma l = 10 h, c out = 10 f v out_ac (5mv/div) ch7 output voltage ripple time (2.5ms/div) lx7 (5v/div) v in = 1.8v, i out = 25ma (4 x wled) l = 10 h, c out = 1 f v out_ac (50mv/div) ch5 output voltage ripple time (500ns/div) lx5 (5v/div) v in = 1.8v, v out = 15v, i out = 30ma l = 10 h, c out = 10 f v out_ac (5mv/div) ch2 output voltage ripple time (500ns/div) lx2 (2v/div) v in = 2.7v, v out = 3.3v, i out = 300ma l = 2.2 h, c out = 10 f x 2 v out_ac (5mv/div) ch3 output voltage ripple time (500ns/div) lx3 (2v/div) v in = 4.2v, v out = 2.5v, i out = 300ma l = 4.7 h, c out = 10 f v out_ac (5mv/div) ch4 output voltage ripple time (500ns/div) lx4 (1v/div) v in = 3.3v, v out = 1.8v, i out = 300ma l = 4.7 h, c out = 10 f v out_ac (2mv/div)
14 ds9917-03 april 2011 www.richtek.com RT9917 ch1 boost output voltage vs. output current 4.96 4.97 4.98 4.99 5.00 5.01 5.02 5.03 5.04 5.05 5.06 0 50 100 150 200 250 300 350 400 450 500 output current (ma) output voltage (v) v in = 3.0v ch3 buck output voltage vs. output current 2.47 2.48 2.49 2.50 2.51 2.52 2.53 2.54 2.55 2.56 2.57 0 50 100 150 200 250 300 350 400 450 500 550 600 output current (ma) output voltage (v) v in = 3.7v ch2 boost output voltage vs. output current 3.29 3.30 3.31 3.32 3.33 3.34 3.35 3.36 3.37 3.38 3.39 0 50 100 150 200 250 300 350 400 450 500 output current (ma) output voltage (v) v in = 2.5v ch4 buck output voltage vs. output current 1.76 1.77 1.78 1.79 1.8 1.81 1.82 1.83 1.84 0 50 100 150 200 250 300 350 400 450 500 550 600 output current (ma) output voltage (v) v in = 3.3v ch5 boost output voltage vs. output current 14.80 14.85 14.90 14.95 15.00 15.05 15.10 15.15 15.20 0 102030405060708090100 output current (ma) output voltage (v) v in = 3.7v ch6 inverting output voltage vs. output current -8.03 -8.02 -8.01 -8 -7.99 -7.98 -7.97 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 output current (ma) output voltage (v) v in = 3.7v
15 ds9917-03 april 2011 www.richtek.com RT9917 application information the RT9917 includes the following seven dc/dc converter channels to build a multiple-output power-supply system. ch1 : ste p-up synchronous current mode dc/dc converter with internal power mosfets. the output voltage could be load disconnected by a switch controller and an external pmos. ch2 : selectable step-up or step-down synchronous current mode dc/dc converter with internal power mosfets. ch3 : step-down synchronous current mode dc/dc converter with internal power mosfets and internal compensation network. ch4 : step-down synchronous current mode dc/dc converter with internal power mosfets and internal compensation network. ch5 : step-up asynchronous current mode dc/dc converter with internal power mosfet and internal compensation network. the output voltage could be load disconnected by an internal pmos. ch6 : inverting current mode dc/dc converter with internal power mosfet. ch7 : current mode wled driver with internal power mosfet and internal compensation network. also provides open led protection. sw1 : load disconnect controller for ch1. sw5 : load disconnect switch for ch5 all converters operate in pwm mode with 1mhz constant frequency under moderate to heavy loading. the RT9917 also provides two different on/off sequences by setting ? seq ? pin. ch1 : step-up converter step-up : the converter operates at fixed frequency pwm mode and continuous current mode (ccm) with internal mosfet and synchronous rectifier for up to 95% efficiency. add a sbd between lx1 and pvdd1 for 2aa battery application. ch2 : selectable step-up or step-down converter step-up : the converter operates at fixed frequency pwm mode and continuous current mode (ccm) with internal mosfet and synchronous rectifier for up to 95% efficiency. step-down : the converter operates at fixed frequency pwm mode and continuous current mode (ccm) with internal mosfet and synchronous rectifier for up to 95% efficiency. while the input voltage is close to the output voltage, the converter enters low dropout mode. the duty could be as long as 100% to extend battery life. ch3 : step-down dc/dc converter the converter operates at fixed frequency pwm mode, ccm and integrated internal compensation. while the input voltage is close to the output voltage, the converter could enter low dropout mode with low output ripple. the duty could be as long as 100% to extend the battery life. ch4 : step-down dc/dc converter the converter operates at fixed frequency pwm mode, ccm and integrated internal compensation. while the input voltage is close to the output voltage, the converter could enter low dropout mode with low output ripple. the duty could be as long as 100% to extend the battery life. ch5 : step-up dc/dc converter it integrates asynchronous boost with an internal mosfet, internal compensation and an external schottky diode to provide ccd positive power supply. the converter is inactive until the sw5 soft start procedure is finished. this feature provides load disconnect function and effectively limits the inrush current at start up. ch6 : inv dc/dc controller this controller integrates an internal p-mosfet and an external schottky diode to provide ccd negative power supply. the output voltage is set as v out = (r10/r11) x (-1.25) (r10, r11 refer to typical application circuit).
16 ds9917-03 april 2011 www.richtek.com RT9917 ch7 : wled driver it is an asynchronous dc/dc converter with an internal mosfet, internal compensation and an external schottky diode to drive up to 4 wled. this channel also features pwm dimming control from en7 pin and open diode protection. the current through wled is set as i (ma) = [250mv/r( )] x duty (%) r : current sense resistor from cfb7 to gnd. duty : pwm dimming by en7 pin. dimming frequency range is from 1khz to 100khz but it is recommended to avoid 2khz to 20khz for audio noise. hold en7 low for more than 15ms will turn off ch7. sw1 sw1 is an open drain controller to drive an external pmos and then functions as a load disconnect switch for ch1. this switch features soft start, power on/off sequence and under voltage protection functions. ok134 is an open drain control pin. once ch1, ch3 and ch4's soft start are completed, sw1 is on. the ok134 pin is slowly pulled low and controlled with soft start to suppress the inrush current. vout1 is used for sw1 soft start and under voltage protection. if sw1 is not used, connect a resistor to vout1 (refer to typical application circuit for li-ion). sw5 sw5 is an internal switch enabled by en5 and functions as a load disconnection for ch5. this switch features soft start, powe on sequence, over voltage (for sw5i) and under voltage (for sw5o) protection functions. charge pumps the charge pump function is enabled while battery type is alkaline battery. this channel provides pump voltage to enhance mos gate driving capability. this function is not necessary while battery is li-ion type. reference voltage the RT9917 provides a precise 1.25v reference voltage with sourcing capability 100 a. connect a 0.1 f ceramic capacitor from vref pin to gnd. reference voltage is enabled by connecting en6 to logic high. furthermore, this reference voltage is internally pulled to gnd in shutdown. for ch2, mode setting is decided by ? sel ? pin. the ch2 of RT9917 features flexible boost or buck topology setting for either 1x li-ion or 2 x aa application by one pin. sequence setting is decided by ? seq ? pin.please note that the logic state can not be changed during operation. seq = high the power on sequence is : ` while en134 goes high, ch1 will be turned on to wait for the completion of ch1's soft start. ` after that, ch3 will be turned on to wait for the completion of ch3's soft start. ` and then, ch4 will be turned on to wait for the completion of ch4's soft start. ` then, sw1 will be turned on and ch2 is allowed to be turned on by en2 at any time. ` finally, sw1's soft start will be completed. the power-off sequence is : ` at first, while en134 goes low, (sw1 is showdown and internally pulled low, ch2 must be turned off by en2) sw1 (note 1) and ch2 (note 2) will be shutdown. ` after that, ch4 will be turned off and internally pulled low to wait for the completion of ch4's shutdown. ` and then, ch3 will be turned off and internally pulled low to wait for ch3's shutdown completion. sel ch2 high boost low buck table 1. mode setting seq power on sequence high ch1 -> ch3 -> ch4 -> (sw1 and ch2) low ch3 -> ch4 -> ch1 -> (sw1 and ch2) seq power off sequence high (sw1 and ch2) -> ch4 -> ch3 -> ch1 low (sw1 and ch2) -> ch1 -> ch4 -> ch3 table 2. sequence setting mode and sequence setting please refer to ? electrical characteristics ? for level of logic high or low.
17 ds9917-03 april 2011 www.richtek.com RT9917 ` then, ch1 will be turned off and internally pulled low (note 3) to wait for ch1's shutdown completion. ` finally, the whole ic will be shutdown (if en5, en6 and en7 already go low). note 1 : the sw1 is designed for ch1. note 2 : if ch2 is configured as a boost, then the ch2 will not be internally pulled low and the completion of shutdown will not be checked. note3 : ch1 is configured as a boost, so the ch1 will not be internally pulled low and the completion of shutdown will not be checked. seq = low the power on sequence is : ` while en134 goes high, ch3 will be turned on to wait for the completion of ch3's soft start. ` after that, ch4 will be be turned on to wait for the completion of ch4's soft start. ` and then, ch1 will be turned on to wait for the completion of ch1's soft start. ` then, sw1 will be turned on and ch2 is allowed to be turned on by en2 at any time. ` finally, sw1's soft start will be completed. the power-off sequence is : ` at first, while en134 goes low, (sw1 is showdown and internally pulled low, ch2 must be turned off by en2) sw1 (note 1) and ch2 (note 2) will be shutdown. ` then, ch1 will be turned off and internally pulled low (note 3) to wait for ch1's shutdown completion. ` after that, ch4 will be turned off and internally pulled low to wait for the completion of ch4's shutdown. ` and then, ch3 will be turned off and internally pulled low to wait for ch3's shutdown completion. ` finally, the whole ic will be shutdown (if en5, en6 and en7 already go low). protection protection type threshold (typical) refer to electrical spec protection methods reset method v dd m over voltage protection v ddm > 6v disable all channels (except ch7) restart if v ddm < 5.6v (with hysteresis) ch1:boost current limit nmos current> 3a nmos off, pmos on automatic reset at next clock cycle pvdd1 ovp pvdd1 > 6v ic shutdown (except ch7) v ddm pow er reset ch2:boost current limit nmos current> 3a nmos off, pmos on automatic reset at next clock cycle pvdd2 ovp pvdd2 > 6v ic shutdown (except ch7) v ddm pow er reset ch2:buck ocp pmos current > 1.5a ic shutdown (except ch7) v ddm pow er reset ch3:buck ocp pmos current > 1.5a ic shutdown (except ch7) v ddm power reset ch4:buck ocp pmos current > 1.5a ic shutdown (except ch7) v ddm power reset ch5: ocp nmos current > 1.5a nmos off automatic reset at next clock cycle ch6: ocp pmos current > 1.5a ic shutdown (except ch7) v ddm pow er reset ch7:wled ocp nmos current > 0.8a nmos off automatic reset at next clock cycle ovp vout7 > 19v shutdown ch 7 reset by toggling en 7 sw1 uvp vout1 < 1.75v after sw1 soft start end ic shutdown (except ch7) v ddm pow er reset sw5 ovp sw5i > 19v ic shutdown (except ch7) v ddm pow er reset uvp sw5o < 0.4v after sw5 soft start end ic shutdown (except ch7) v ddm pow er reset thermal thermal shutdown temperature > 160 c all channels stop switching temperature < 140 c
18 ds9917-03 april 2011 www.richtek.com RT9917 thermal considerations for continuous operation, do not exceed absolute maximum operation junction temperature. the maximum power dissipation depends on the thermal resistance of ic package, pcb layout, the rate of surroundings airflow and temperature difference between junction to ambient. the maximum power dissipation can be calculated by following formula : p d(max) = ( t j(max) - t a ) / ja where t j(max) is the maximum operation junction temperature 125 c, t a is the ambient temperature and the ja is the junction to ambient thermal resistance. for recommended operating conditions specification, where t j(max) is the maximum junction temperature of the die (125 c) and t a is the ambient temperature. the junction to ambient thermal resistance ja is layout dependent. for wqfn-40l 5x5 packages, the thermal resistance ja is 36 c/w on the standard jedec 51-7 four layers thermal test board. the maximum power dissipation at t a = 25 c can be calculated by following formula : p d(max) = (125 c ? 25 c) / (36 c/w) = 2.778w for wqfn-40l 5x5 packages the maximum power dissipation depends on operating ambient temperature for fixed t j(max) and thermal resistance ja . for RT9917 package, the figure 1 of derating curves allows the designer to see the effect of rising ambient temperature on the maximum power allowed. figure 1. derating curves for RT9917 packages layout consideration ` all the traces of the compensation components should be short to reduce the parasitic connection resistance and isolated from other noisy device traces. the ground traces must be connected to ground plane independently. compensative parts: r15, c16, r18, c19, r12, c11, c14. ` all the traces of the feedback components should be short to reduce the parasitic connection resistance and isolated from other noisy device traces. the ground traces must be connected to ground plane independently. output sense trace must be kept away from the noisy device (inductor). feedback parts: r13, r14, c15 for ch1. r16, r17, c18 for ch2. r3, r4, c4 for ch3. r5, r6, c6 for ch4. r7, r8, c9 for ch5. r10, r11, c13for ch6. r9 for ch7. ` all the traces of connecting inductor must be as wide as possible. inductor: l1, l2, l3, l4, l5, l6, l7. ` output capacitor should be placed close to vout and connected to ground plane to reduce noise coupling. output capacitor: c1, c5, c7, c8, c10, c12, c17 and c24. ` input capacitor should be placed close to vbat and connected to ground plane. input capacitor: c2, c3, c20, c21, c26, c27 and c28. ` the gnd (pin 27) and exposed pad should be connected to a strong ground plane for heat sinking and noise protection. ` the en7 pin is used for dimming control. keep the fb3 trace away from the en7. 0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 0 153045607590105120135 ambient temperature (c) maximum power dissipation (w ) four layers pcb ( c)
19 ds9917-03 april 2011 www.richtek.com RT9917 figure 2 lx should be connec ted to inductor by wide and short trace, keep sensitive components away from this trace. 30 29 28 27 26 25 24 23 22 21 31 32 33 34 35 36 37 38 39 40 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 pvdd2 vddm cfb7 gnd lx7 lx5 vout7 fb3 en7 lx3 pvdd1 pvdd6 cp cn cpo fb6 fb4 comp6 lx4 pvdd4 sw5o sw5i fb5 vref sel seq en6 pvdd3 en134 comp1 fb1 ok134 vout1 fb2 comp2 en2 lx2 gnd lx6 en5 lx1 41 c25 v bat c3 v bat c26 c27 v bat d3 l6 l5 d1 c8 c10 d1 d2 d3 d4 r9 gnd wled+ wled- c4 r3 r4 l2 gnd vout3 c5 gnd r8 c9 r7 v bat gnd c20 c24 c21 v bat gnd vout5 vout5 l3 c7 gnd c11 c14 r12 r6 r5 c6 c13 r11 r10 vout4 vout6 d2 l7 c12 r14 r13 c15 c16 r15 r1 r18 c19 r17 r16 c18 l4 c17 gnd vout2 c2 l1 c1 v bat vout1 gnd gnd place the feedback and compensation components as close as possible to the fb and comp pin and keep away from noisy devices. input/output capacitors must be placed as close as possible to the input/output pins. connect the exposed pad to a ground plane.
20 ds9917-03 april 2011 www.richtek.com RT9917 richtek technology corporation headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 information that is provided by richtek technology corporation is believed to be accurate and reliable. richtek reserves the ri ght to make any change in circuit design, specification or other related things if necessary without notice at any time. no third party intellectual property inf ringement of the applications should be guaranteed by users when integrating richtek products into any application. no legal responsibility for any said applications i s assumed by richtek. richtek technology corporation taipei office (marketing) 5f, no. 95, minchiuan road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)86672399 fax: (8862)86672377 email: marketing@richtek.com outline dimension symbol dimensions in millimeters dimensions in inches min max min max a 0.700 0.800 0.028 0.031 a1 0.000 0.050 0.000 0.002 a3 0.175 0.250 0.007 0.010 b 0.150 0.250 0.006 0.010 d 4.950 5.050 0.195 0.199 d2 3.250 3.500 0.128 0.138 e 4.950 5.050 0.195 0.199 e2 3.250 3.500 0.128 0.138 e 0.400 0.016 l 0.350 0.450 0.014 0.018 w-type 40l qfn 5x5 package d e d2 e2 l b a a1 a3 e 1 see detail a note : the configuration of the pin #1 identifier is optional, but must be located within the zone indicated. det ail a pin #1 id and tie bar mark options 1 1 2 2

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