60 ics 1-1-3 dc/dc converter ics recommended operating conditions *1 parameter input voltage range output voltage range output current range operating junction temperature range operating temperature range symbol v in v cc v c/e v o i o t jop t op unit v v v v a c c absolute maximum ratings *1 unit v v v w c c c/w c/w symbol v in v cc v c/e p d t j t stg j-c j-a parameter input voltage power dissipation *2, *3 junction temperature storage temperature thermal resistance (junction to case) *2 thermal resistance (junction to ambient air) *2 ratings SPI-8001TW spi-8002tw spi-8003tw 21 40 40 21 40 40 21 40 40 3.0 +135 +150 ?0 to +135 ?0 to +150 9.0 35.8 features ? regulators combined in one package output current: 1.5a 2 (hsop 16 pin surface mount package) ? igh efficiency: typ80% (SPI-8001TW), typ78% (spi-8002tw) ? ariable output voltage: 1.0 to 16v (spi- 8001tw), 1.0 to 24v (spi-8002tw) built-in reference oscillator (250khz): enables to downsize a choke-coil low circuit current consumption: 1 a (at output off) high accuracy reference voltage: 1% built-in foldback-overcurrent and thermal protection circuits built-in on/off circuit (soft start available) per output *1: absolute maximum ratings show the destructive limit. no parameter should exceed the ratings in transient or normal operations. *2: when mounted on glass-epoxy board 70cm 2 (copper laminate area 30.8cm 2 ). *3: limited by thermal protection. ratings SPI-8001TW spi-8002tw spi-8003tw min. max. min. max. min. max. v o +3 20 v o +3 38 v o +3 38 4.5 20 4.5 38 4.5 38 20 38 38 116 1241 24 1.5 1.5 1.5 ?0 +135 ?0 +135 ?0 +125 ?0 +135 ?0 +135 ?0 +85 *1: recommended operating conditions show the operating conditions required for the normal circuit function described in the ele ctrical characteristics. these conditions must be followed in actual use. 2-output, step-down switching mode SPI-8001TW/spi-8002tw/spi-8003tw applications onboard local power supplies ? a equipment for stabilization of the secondary-side output voltage of switching power supplies
61 ics SPI-8001TW/spi-8002tw/spi-8003tw electrical characteristics *1 unit v mv/ c % % khz mv mv a ma ma a a ma ma v v a v a parameter reference voltage t emperature coefficient of reference voltage efficiency 1 *2 efficiency 2 *2 oscillation frequency line regulation load regulation overcurrent protection starting current quiescent circuit current 1 quiescent circuit current 2 quiescent circuit current 3 quiescent circuit current 4 quiescent circuit current 5 quiescent circuit current 6 high level voltage c/e pin low level voltage inflow current at high low level voltage ss pin *3 inflow current at low symbol v ref conditions ? v ref / ? t conditions eff1 conditions eff2 conditions f osc conditions v line conditions v load conditions i s conditions i in conditions i cc conditions i in (off) conditions i cc (off) conditions i in (ssov) conditions i cc (ssov) conditions v c/eh conditions v c/el conditions i c/eh conditions v ssl conditions i ssl conditions (t a =25 c) *1: electrical characteristics show the characteristic ratings guaranteed when operating the ics under the measurement condition s described in the above table. *2: efficiency is calculated from the following formula. (%) = v o ? o 100 v in ? in *3: pin 6 and pin 11 are the ss pins. soft start at power on can be performed with capacitors connected to these pins. the outpu ts can also be turned on/off with these pins. the outputs are stopped by setting the voltages of these pins to v ssl or lower. ss-pin voltages can be changed with open-collector drive circuits of transistors. when using both the soft-start and on/off functions together, the discharge currents from c 4 and c 5 flow into the on/off control transistors respectively. therefore, limit the currents securely to protect the transistors if c 4 and c 5 capacitances are large. the ss pins are pulled up to the power supply in the ics, so applying the external voltages are prohibited. ratings SPI-8001TW spi-8002tw spi-8003tw min. typ. max. min. typ. max. min. typ. max. 0.996 1.006 1.016 0.996 1.006 1.016 0.966 1.006 1.016 v in =10v, v o =1v, i o =0.1a v in =14v, i o =0.1a 0.1 0.1 0.1 v in =10v, v o =1v, i o =0.1a, ta=?0 to +135 c v in =14v, i o =0.1a, ta=?0 to +125 c 80 78 78 v in =v cc =15v, v o =5v, i o =0.5a, i in : including i cc v in = v cc =14v, v o =5v, i o =0.5a, i in : including i cc 83 81 81 v in =15v, v o =5v, i o =0.5a, v cc =5v, i in : excluding i cc v in =14v, v cc =5v, v o =5v, i o =0.5a, i in : excluding i cc 250 215 250 285 200 400 v in =v cc =15v, v o =5v, i o =0.5a v in =14v, i o =0.1a, c osc =100pf 30 60 30 60 30 60 v in =v cc =10 to 20v, v o =5v, i o =1a v in =v cc =9 to 18v, v o =5v, i o =1a 10 40 10 40 10 40 v in =v cc =15v, v o =5v, i o =0.2 to 1.5a v in =v cc =14v, v o =5v, i o =0.2 to 1.5a 1.6 1.6 1.6 v in =v cc =15v v in =v cc =14v 444 v in =15v, v cc =5v, i o =0v, v o 12v v in =14v, v cc =5v, i o =0a, v o 12v 8.5 8.5 8.5 v cc =15v, i o =0a v cc =14v, i o =0a 111 v in =15v, v c/e =0v or open v in =14v, v c/e =0v or open 111 v cc =15v, v c/e =0v or open v in =14v, v c/e =0v or open ? ? v in =14v, v cc =5v, i o =0a, ss1=ss2=0v 8.5 ? cc =14v, i o =0v, ss1=ss2=0v 22 2 v in =v cc =15v v in =v cc =14v 0.8 0.8 0.8 v in =v cc =15v v in =v cc =14v 95 95 95 v c/e =20v v c/e =20v 0.5 0.5 0.5 v in =v cc =15v v in =v cc =14v 60 80 60 80 60 80 v ssl =0v, v in =v cc =15v v ssl =0v, v in =v cc =14v
62 ics 1-1-3 dc/dc converter ics (unit : mm) external dimensions (hsop16) 10.5 0.2 2.5 0.2 2.75max 7.5 0.2 0.4+0.15/?.05 1.27 0.25 2.0+0.2/?.08 a 10.5 0.3 0.9 0.3 0 to 0.1 0 to 8 0.25+0.15/?.05 (2) (4.5) 1+0.1/?.05 (heatsink thickness) 1.35 ?.2 (between the root of leads and back side) 12.2 ?.2 (gate remains: not included in dimensions) s 0.10 s enlarged view of a 16 9 18 (11) 9 16 pin assignment (SPI-8001TW, spi-8002tw) q agnd o agnd w v in1 ! 0 v ref2 e v cc ! 1 ss2 r swout1 ! 2 dgnd2 t dgnd1 ! 3 swout2 y ss1 ! 4 c/e u v ref1 ! 5 v in2 i n.c ! 6 n.c block diagram SPI-8001TW/spi-8002tw reset 3v 1v 3v agnd ss1 6 amp buffer-amp v ref1 7 r5 c4 v ref v c/e v cc 3 14 c/e v in1 2 tsd fdown + sw out1 dgnd1 dgnd2 v in2 4 5 15 13 l1 di1 l2 c2 r1 r2 r3 r4 v o1 v o2 agnd f down cut + + pwm agnd 1, 9 + c7 + c1 c6 v in di2 3v ss2 11 amp buffer-amp v ref2 10 r6 c5 + 12 sw out2 c3 + + pwm + c8 osc reset preg start f down cut drive pwm logic ocp ocp drive pwm logic uvlo pin assignment (spi-8003tw) q agnd o agnd w v in1 ! 0 r osc e v cc ! 1 v ref2 r swout1 ! 2 ss2 t dgnd1 ! 3 dgnd2 y ss1 ! 4 swout2 u v ref1 ! 5 c/e i c osc ! 6 v in2 spi-8003tw 3v 1v 3v a gnd ss1 6 amp buffer-amp v ref1 7 r5 r7 c9 c5 c6 v ref v c/e v cc 3 15 c/e v in1 2 tsd fdown + sw out1 dgnd1 dgnd2 v in2 4 5 16 14 l1 di1 l2 c2 r1 r2 r3 r4 v o1 v o2 a gnd f down cut + + pwm a gnd 1, 9 + c7 + c1 c4 v in di2 3v ss2 12 amp buffer-amp v ref2 11 10 8 r6 + 13 sw out2 c3 + + pwm + c8 osc reset preg start f down cut drive pwm logic ocp ocp drive pwm logic uvlo cosc rosc product mass : approx.0.86g
63 ics SPI-8001TW/spi-8002tw/spi-8003tw t ypical connection diagram v in gnd v c/e v cc 3 v in1 swout1 r5 c4 c1 c6 + 24 ss1 6 11 dgnd1 5 v in2 15 ss2 dgnd2 12 7 v ref1 13 swout2 10 v ref2 r6 c5 c/e agnd ch2 ch1 14 1, 9 di2 l2 i ref2 c3 v 02 c8 + gnd di1 l1 i ref1 c2 r1 r2 r3 r4 v 01 c7 + spi-8000tw diodes di1, di2 ? be sure to use schottky-barrier diodes for di1 and di2. if other diodes like fast recovery diodes are used, ic may be destroyed because of the reverse voltage generated by the recover y voltage or on voltage. choke coils l1, l2 if the winding resistance of the choke coil is too high, the efficiency may drop below the rated value. as the overcurrent protection starting current is about 2.0a, take care concerning heat radiation from the choke coil caused b y magnetic saturation due to overload or short-circuited load. use a closed-magnetic-path coil to prevent interference between the channels sw out 1 and sw out 2. capacitors c1, c2, c3 as large ripple currents flow through c1, c2 and c3, use high-frequency and low-impedance capacitors suitable for switching mo de power supplies. especially when the impedance of c2 and c3 are high, the switching waveforms may become abnormal at low temperatures. for c2 an d c3, do not use capacitors with extremely low equivalent series resistance (esr) such as os capacitors or tantalum capacitors, which may cause abnormal oscillation. resistors r1, r2, r3, r4 r1, r2, r3 and r4 are resistors for setting output voltages. set the resistors so that i ref is approx. 1 ma. for example, r1 and r2 can be calculated as shown below. (v o1 ? ref1 )(v o1 ?) v ref1 1 r1= i ref1 = 1 10 ? ( ? ), r2= i ref1 = 1 10 ? 1(k ? ) to create the optimum operating conditions, place the components as close as possible to each other. c1 : 220 f/50v c2, c3 : 470 f/25v c4, c5 : 1 f c6, c7, c8 : 0.1 f note 1: the efficiency depends on the input voltage and the output current. therefore, obtain the value from the efficiency grap h and substitute the percent- age in the formula above. note 2: thermal design for d 1 must be considered separately. t a -p d characteristics v o : output voltage v in : input voltage i o : output current ? : efficiency (%) v f :d 1 forward voltage sjpb-h6?.45v (i o =1a) p d = v o ? o 100 ? ?v f ? o 1 v o ? v in ?5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 025507 5 100 125 135 150 power dissipation p d (w) ambient temperature t a ( c) 69.2 c/w (0.84 cm 2 ) 52.3 c/w (3.34 cm 2 ) 42.6 c/w (8.64 cm 2 ) 35.8 c/w (30.8 cm 2 ) (copper laminate area) j-a 38.2 c/w (15.6 cm 2 ) = . . v in gnd v c/f v cc 3 v in1 swout1 r5 c5 c1 c4 c9 r7 + 24 ss1 6 12 dgnd1 5 v in2 16 ss2 dgnd2 13 7 v ref1 14 swout2 11 v ref2 r6 c6 c/e a gnd c orc r csc ch2 ch1 15 1, 9 10 di2 l2 i ref2 c3 v c2 c8 + gnd di1 l1 i ref1 c2 r1 r2 r3 r4 v c1 c7 + 8 spi-8003tw r5, r6 : 1k ? l1, l2 : 47 h di1, di2 : sjpb-h6 (sanken) c1 : 220 f/50v c2, c3 : 470 f/25v c4 : 1 f/50v c5, c6 : 1 f/10v c7, c8 : 0.1 f/50v c9 : 100pf/10v l1, l2 : 47 h r2, r4 : 1k ? r5, r6 : 1k ? di1, di2 : sjpb-h6 (sanken)
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