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at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 1 features ? low start-up power supply voltage :1.7v(ch6) ? wide supply voltage range from 2.4v to 6.5v (ch6); 3.6v to 6.5v(ch1~5) ? up to 1mhz operating frequency ? supports for down and up/down zeta synchronous rectification conversion(ch1) ? supports for up and up/down sepic synchronous rectification conversion(ch2, ch5) ? supports for up, flyback and up/down sepic conversion at1393/c: ch2,ch3, ch4 , ch5 and ch6 at1393a/b:ch2,ch3,ch5 and ch6 ? supports for inverting conversion at1393a:ch4 ? synchronized rectification on ch1,ch2,ch5 ? power on/off control function ? built-in soft-start function ? built-in short-circuit protection circuit. ? lqfp 48 package general description the at1393 provides a complete power solution for digital still and video cameras through the integration of synchronous rectification topology , soft start function and short circuit detection function. this ic is ideal for applications that use either 2 or 3 alkaline or nimh batteries as well as those using a single li-ion battery. applications ? digital cameras ? ccd imaging devices ? camcorders pin assignment ordering information part number package marking at1393f lqfp48 at1393f at1393f _ pbf lqfp48, pb-free at1393f,date code with one bottom line at1393f _ gre lqfp48,green at1393f,date code with two bottom line at1393af lqfp48 at1393af at1393af _ pbf lqfp48, pb-free at1393af,date code with one bottom line at1393af _ gre lqfp48,green at1393af,date co de with two bottom line aimtron reserves the right without notice to change this circuitry and specifications.
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 2 pin description pin no. pin name function 1swoutout p ut switch control circuit out p u t 2 swin output switch control circuit input 3 fb6 ch6 error amplifier output 4 in6 ch6 error amplifier inverted input 5 cin6 ch6 soft start setting 6 dtc5 ch5 dead time control 7 fb5 ch5 error amplifier output 8 in5 ch5 error amplifier inverted input 9 ina4 ch4 inverting amplifier input 10 outa4 ch4 inverting amplifier output 11 fb4 ch4 error amplifier output 12 in4 ch4 error amplifier inverted input 13 ins4 ch4 short detection comparator inverter input 14 dtc4 ch4 dead time control 15 cs ch1 to ch5 soft start setting 16 vref reference 2.5v output 17 agnd ground 18 cscp timer latch shout-circuit detection input 19 vcc power supply 20 ctl ch6 power supply control input 21 ctl1_ 2 ch1 and ch2 on/off control input 22 ctl3 ch3 on/off control input 23 ctl4 ch4 on/off control input 24 ctl5 ch5 on/off control input 25 rt oscillation frequency setting resistor 26 ct oscillation frequency setting capacitor 27 vb triangular wave oscillator regulator output 28 in3 ch3 error amplifier inverted input 29 fb3 ch3 error amplifier output 30 dtc3 ch3 dead time control 31 in2 ch2 error amplifier inverted input 32 fb2 ch2 error amplifier output 33 dtc2 ch2 dead time control 34 in1 ch1 error amplifier inverted input 35 fb1 ch1 error amplifier output 36 dtc1 ch1 dead time control 37 out1-1 ch1 main side output(p-ch mosfet) 38 out1-2 ch1 synchronous rectifier side output 39 out2-1 ch2 main side output 40 out2-2 ch2 synchronous rectifier side output 41 out3 ch3 output(n-ch mosfet) 42 pvcc output circuit power supply 43 out4 ch4 output at1393/c:drive n-ch mosfet for boost converter at1393a/b:drive p-ch mosfet for inverting 44 pgnd output circuit ground 45 out5-1 ch5 main side output(n_ch mosfet) 46 out5-2 ch5 synchronous rectifier side output 47 out6 ch6 output 48 rb output current setting resistor
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 3 absolute maximum ratings ratin g parameter symbol condition min max unit power supply voltage vcc -- -- 7 v output current io output pin -- 20 ma output peak current io output pin, duty Q 5% -- 200 ma power dissipation p d ta Q 25 (lqfp-48p) -- 860 mw operating temperature t opt -- -30 85 storage temperature t stg -- -55 125 esd susceptibility (hbm) -- -- 2kv esd susceptibility (mm) -- -- 200 v recommended operating conditions value parameter symbol condition min t yp max unit startup power supply voltage vcc ch6 1.7 -- 5.5 v ch6 2.4 5.0 5.5 v power supply voltage vcc ch1 to ch5 3.6 5.0 5.5 v reference voltage output current i or vref pin -1 -- 0 ma vb pin output current i b vb pin -0.5 -- 0 ma in1 to in5, ina4, ins4 pins 0--vccv input voltage v in in6 pin 0 -- vcc-0.9 v control input voltage v ctl ctl pin 0 -- 7 v out pin (ch1 to ch5) -- 2 15 ma out pin (ch6) 1 2 15 ma output current io out pin -- 1 4 ma output current setting resister r b rb6 pin 2.4 24 51 k oscillator f osc -- 100 500 1000 khz timing capacitor c t -- 47 100 560 pf timing resistor r t -- 8.2 18 100 k cs ch1 to ch5 -- 0.027 1.0 f soft start capacitor c +in6 ch6 -- 0.47 1.0 f short detection capacitor c scp -- -- 0.1 1.0 f vb pin capacitor c vb -- 0.082 0.1 -- f operating ambient temperature ta -- -20 25 85
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 4 electrical characteristics (ta=25 , vcc=pvcc=5v) value parameter symbol condition min t yp max unit reference voltage v ref -- 2.40 2.50 2.60 v output voltage temperature stability v ref / v ref ta = -30 to 85 -- 0.5 -- % input stability line vcc=3.6 to 5.5v -10 -- 10 mv reference voltage block [ref] load stability load vref=0ma to ?1ma -10 -- 10 mv threshold voltage v th vin=0v to vcc 2.6 2.8 3.0 v hysteresis width v h -- -- 0.2 -- v ch1 to ch5 reset voltage v rst vin=vcc to 0v 1.20 1.30 1.40 v under voltage lockout block [u.v.l.o] ch6 threshold voltage v th vin=0v to vcc 1.35 1.5 1.65 v soft start block [cs] charge current i cs -- -1.4 -1.0 -0.6 a soft start block [cin6] charge current i cin6 -3.0 -2.5 -2.0 a threshold voltage v th -- 0.65 0.70 0.75 v input standby voltage v stb -- -- 50 100 mv input latch voltage v i -- -- 50 100 mv short circuit detection block [scp] input source current i cscp -- -1.4 -1.0 -0.6 a oscillator frequency f osc ct=100pf, rt=18k 450 500 550 khz frequency stability for voltage f / fdv vcc=4v to 5.5v -- 1 10 % triangular wave oscillator block [osc] frequency stability for temperature f / fdt ta=-30 to 85 -- 1 20 % threshold voltage v th fb=in 1.24 1.25 1.26 v v t temperature stability v t / v t ta = -30 to 85 -- 0.5 -- %
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 5 in=0v (ch1 to ch3, ch5) -320 -80 -- na input bias current i b in=0v (ch4) -120 -30 -- na voltage gain a v dc 60 100 -- db frequency bandwidth bw a v =0db -- 1.0 -- mhz v oh -- 2.2 2.4 -- v output voltage v ol -- -- 50 200 mv output source current i source fb=2.3v -- -2.0 -1.0 ma error amplifier block (ch1 to ch5) [error amp] output sink current i sink fb=1.45v 70 140 -- a threshold voltage v th fb=0.55 1.24 1.25 1.26 v temperature stability v t / v t ta = -30 to 85 -- 0.5 -- % input bias current i b in=0v -100 -20 -- na voltage gain a v dc 60 75 -- db frequency bandwidth bw a v =0db -- 1.0 -- mhz v oh -- 1.1 1.3 -- v output voltage v ol -- -- 0 200 mv output source current i source fb=0.55v -- -2.0 -1.0 ma error amplifier block (ch6) [error amp] output sink current i sink fb=0.55v 60 120 -- a input offset voltage v io out=1.25v -10 0 10 mv input bias current i b in=0v -120 -30 -- na voltage gain a v dc 60 100 -- db frequency bandwidth bw a v =0db -- 1.0 -- mhz v oh -- 2.2 2.4 -- v output voltage v ol -- -- 50 200 mv output source current i source out=1.25v -- -2.0 -1.0 ma inverting amplifier block (ch4) [inv amp] output sink current i sink out=1.25v 70 140 -- a threshold voltage v th ch1 to ch5 0.97 1.00 1.03 % in=0v (ch1 to ch3, ch5) -320 -80 -- na short detect comparator (ch1 to ch5) [scp comp] input bias current i b in=0v (ch4) -200 -50 na short detect comparator (ch6) threshold voltage v th -- 0.8 0.9 1.0 v
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 6 v t0 duty = 0 % 1.0 1.1 -- v threshold voltage v tmax duty = 100 % -- 1.8 1.9 v pwm comp. (ch1 to ch5) [pwm comp] input current i dtc dtc=0.4v (ch1 to ch5) -1.0 -0.3 -- a v t0 duty = 0 % 0.2 0.3 -- v threshold voltage v tmax duty = 100 % -- 0.74 0.84 v pwm comp. (ch6) [pwm comp] maximum duty cycle dtr ct=100pf, rt=18k rb=24k 70 80 -- % output source current i source out=vcc/2 -- -130 -- ma output sink current i sink out=vcc/2 -- 100 -- ma r oh out = -15ma -- 18 30 output block (ch1,2,4,5) [pch mos] output on resistor r ol out = 15ma -- 16 25 output source current i source out=vcc/2 -- -130 -- ma output sink current i sink out=vcc/2 -- 100 -- ma r oh out = -15ma -- 18 30 output block (ch1 to ch5) [nch mos] output on resistor r ol out = 15ma -- 16 25 output source current i source out=0.7v,rb=24k -2.6 -2.0 -1.4 ma output block (ch6) [drive] output sink current i sink duty Q 5%,out=0.7v -- 40 -- ma v ih swout = ?l? level 1.5 -- 6.5 v sw input voltage v il swout = ?h? level 0 -- 0.4 v input current i swin swin = 5v -- 100 200 a output source current i source duty R9 5%, swout=0v -- -9 -- ma output sink current i sink duty Q 5%, swout=5v -- 17 -- ma r oh swout = -4ma -- 250 400 output switch control block [sw] output on resistor r ol swout = 4ma -- 100 150 v ih active mode 1.5 -- 6.5 v ctl input voltage v il standby mode 0 -- 0.4 v control block (ctl, ctl1 to ctl5) [ctl] input current i ctl ctl = 5v -- 100 200 a vcc standby current icss ctl=0v -- -- 10 a pvcc standby current icss(o) ctl=0v -- -- 10 a general vcc nominal supply current icc ctl, ctl1 to ctl5 = 5v -- 6 9 ma
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 7 block diagram
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 8 application circuit
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 9
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 10 typical characteristics
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 11
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 12 function description 1. power converter reference voltage block a temperature independent voltage of typi cal value at 2.50v is generated from the power source by the reference voltage circuit, which is used as a reference voltage for all internal circuitry a nd supplies load current to external device up to 1 ma. triangular oscillator block a triangular oscillation waveform is gene rated by connecting a timing resistor (rt) to pin 25 and a timing capacitor (ct) to pin 26. the resulting waveforms ct (amplitude at 0.3v to 0.8v), ct1 (in phase with ct with amplitude at 1.1v to 1.8v) and ct2 (reverse phase with ct w ith amplitude at 1.1v to 1.8v) serve as input to the pwm comparator. error amplifier block the error amplifier controls the error signal to the pwm comparator by sensing the dc/dc converter output voltage. furthermore, by connecting feedback resistor and capacitor from the output pin to the inverted input pin of the error amplifier, an arbitrary loop gain can be set to make the system stable. inverting amplifier block the inverting amplifier detects the ne gative dc/dc converter output voltage and sends a control signal to the error amplifier. pwm comparator block the pwm comparator converts the input vo ltage to pulse width and thereby the duty cycle of the dc/dc converter. channels 1, 2, and 5 main sides, channel 3, 4, and 6 : the comparator keeps the output transistor turn on while the error amplifier output voltage and dtc voltage are higher than the triangular wave voltage. channels 1, 2, and 5 synchronous rectification sides : the comparator keeps the output transistor turn on while the error amplifier output voltage are lower than the triangular wave voltage.
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 13 output block a totem pole configuration is designed for the output block and can drive external mosfet or transistor. 2. channel control the channels are turned on and turned of f according to the voltage levels at the ctl, ctl12, ctl3, ctl4, and ctl5 as described in the following table. voltage level at control (c tl) pin channel on/off status ctl ctl1,2 ctl3 ctl4 ctl5 ch6 ch1,2 ch3 ch4 ch5 l x x x x off (standby state) loff l h off on loff l h h off on on loff l h off on loff l h h h off on on on loff l h off on loff l h h off on on loff l h off on loff h h h h h on on on on on x : don?t care 3. protective functions short circuit protection and timer latch the comparator for short circuit detect ion in each channel detects the output voltage level of the power converter. when the output voltage falls below the short detection level, there will be a c onstant bias current charging the external capacitor c scp that is connected to the cscp pin until the capacitor voltage level reaches about 0.7v and the output transi stor turned off consequently. the actuated protection can be rese t by restarting the power source.
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 14 under-voltage lockout protection the under-voltage lockout protection is triggered when the supply voltage momentarily drops during tr ansient, which may cause the ic to malfunction. to prevent such malfunctions, the under-volta ge lockout protection circuit will turn off the output transistor, set the dead tim e to 100%, and hold the cscp pin at the ?l? level after detecting a de crease in internal reference voltage with respect to the power supply voltage,. output switch control when the power is turned on, output switch control circ uit (swin = ?l?) prevents the reactive current from flowing to ex ternal ch5 and ch6. after releasing uvlo and the c+in6 pin voltage goes above 0.9v, if swin is ?h? then swout becomes ?l? to turn on the external mosfet and generate output voltage.
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 15 4. soft start function the ctl, ctl1,2, ctl3, ctl4, and ctl5 terminals are driven to high level at the same time. the driving scheme is described in the following diagram.
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 16 after ch6 soft start and driving the ctl1,2, ctl3, ctl4, and ctl5 to high level. the driving scheme is described in following diagram.
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 17 soft start setting (for ch6) consider the input voltage a nd the load current to decide the value of the capacitor connected to the cin6 pin. the soft start time ts(s) until the dc/dc converter output voltage of ch6 reaches 95% can be calculated by: ts(s) = 0.45 * c 1 ( f) soft start setting (for ch1 to ch5) ts(s) = 1.25 * c s ( f) note : it could be disabled soft star t function by floating cin6 pin or cs pin. ) 1 ( 25 . 1 ) ( ^ rc ts in c e v ? + ? = ? ? ? ? ? ? + = k k k k r 75 45 75 * 45
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 18 determine oscillator frequency the triangular oscillator frequency is decided by the timing capacitor (c t ) and timing resistor (r t ) according to the following formula: f osc (khz) = 900000/( r t (k )* c t (pf)) dc/dc output voltage for ch1 to ch3, ch5 and ch6 for ch4
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 19
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 20 the ch6 source current the output circuit of ch6 is illustrated in the following diagram. it can determine the output source current by defi ning the value of resistor r b . note that the source current can be calculated by the following equation. output source current = (v rb /r b ) * 210 (a) setting time of short circuit protection the scp comparator in ea ch channel detects the output vo ltage to decide whether the power converter works at normal condition. at the same time, the voltage level of cscp pin is held at low level. if th e output load of th ese converters rapidly malfunction or become shorted, causi ng the output voltage to drop, the scp comparator detects that and enables short circuit protection. the time period for short circuit protection is shown in the following equation. short detection time (t pe (s)) t pe (s) = 0.7 * c scp ( f) note : it could be disabled short circ uit protection function by connecting cscp pin into the ground.
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 21 setting the dead time control level when using step up or zeta or flyb ack dc/dc converter, it must prevent that output transistor works at full-on state ( on duty = 100%). to prevent this situation, set the maximum duty of these channels. the dead time control circuit is implemented as below. when the volta ge at the dtc1 pin is higher than the triangular wave voltage (ct1), the output transistor is turned on. the maximum duty calculation formula assuming that tr iangular wave amplitude = 0.7v and triangular wave minimum voltage = 1.1v. note 1 : the circuit is suitable at ch1 to ch5. note 2 : shorting dtc and vref to disable dead time control function. using ch4 inv amp. when not using the ch4 inv amp., connect the ina4 and outa4 each other. ( ) [ ] % 100 7 . 0 / 1 . 1 ? = d v duty
at1393/a/b/c preliminary product information 6-channel dc-dc converter ic for dsc 2f, no.10, prosperity rd. ii, science-based industrial park, hsinchu 300,taiwan, r.o.c. tel: 886-3-563-0878 www: http://www.aimtron.com.tw fax: 886-3-563-0879 email: service@aimtron.com.tw 22 package description lqfp48

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