32 ics 1-1-3 dc/dc converter ics features ?surface-mount package (to263-5) ?output current: 3.5 a ?high effici ency: 83% (vo = 5 v, v in = 15 v, io = 2 a) ?requires only 6 discrete components ?built-in reference oscillator (300 khz) ?built-in drooping-type overcurrent and thermal protection circuits ?built-in soft start circuit (output on/off available) - si-8001fde ?built-in on/off function (active low) - si-8001fdl ?low current consumption during off - si-8001fdl lineup absolute maximum ratings unit v v w c c c/w c/w ratings si-8001fde si-8001fdl 43 ? in 3 +150 ?0 to +150 3 *1 33.3 *1 symbol v in v c p d t j t stg j-c j-a parameter input voltage on/off control voltage power dissipation *1 junction temperature *2 storage temperature thermal resistance (junction to case) thermal resistance (junction to ambient air) part number si-8001fde si-8001fdl v o (v) variable(0.8 to 24) i o (a) 3.5 function soft start on/off conditions when mounted on glass-epoxy board measuring 40 40 mm (copper laminate area: 100%) when mounted on glass-epoxy board measuring 40 40 mm (copper laminate area: 100%) when mounted on glass-epoxy board measuring 40 40 mm (copper laminate area: 100%) *1 : limited by thermal protection circuit *2 : this product has built-in thermal protection circuits that may activate when the junction temperature exceeds 130 c. the recommended design for the junction temperature during ic operation is below 125 c. parameter input voltage range output voltage range output current range operating junction temperature range operating temperature range symbol 7 * / 7 0 * 0 5 k p q 5 p q ratings si-8001fde si-8050fdl v o+3 *1 to 40 0.8 to 24 0 to 3.5 ?0 to +100 ?0 to +85 unit v v a c c *1: the minimum value of the input voltage range is 4.5 v or vo + 3 v, whichever is higher. recommended operating conditions electrical characteristics unit v mv/ c % khz mv mv a v a v v a ma a parameter reference voltage te mperature coefficient of reference voltage efficiency oscillation frequency line regulation load regulation overcurrent protection starting current low level voltage ss pin *1 outflow cuurent at low voltage on/off control voltage (output on) on/off pin *2 on/off control voltage (output off) on/off controll current (output on) quiescent circuit current symbol v adj conditions ? v adj / ? t conditions conditions f o conditions ? v oline conditions ? v oload conditions i s conditions v ssl i ssl conditions vc, ih vc, il ic, ih conditions iq conditions iq(off) conditions (r1=4.2k ? , r2=0.8k ? when ta = 25 c and vo=5v) *1: pin 5 is the ss pin. soft start at power on can be performed with a capacitor connected to this pin. the output can also be turned on/off with this pin. the output is stopped by setting the voltage of this pin to vssl or lower. ss-pin voltage can be changed with an open-collector drive circuit of a transistor. when using both the soft-start and on/off functions together, the discharge current from c3 flows into the on/off control transistor. therefore, limit the current securely to protect the transistor if c3 capacitance is large. the ss pin is pulled up (3.7 v typ.) to the power supply in the ic, so applying the external voltage is prohibited. if this pin is not used, leave it open. *2: output is off when the output control terminal vc is open. each input level is equivalent to ls-ttl. therefore, the device can be driven directly by ls-ttls. ratings si?001fde si?001fdl min. typ. max. min. typ. max. 0.784 0.800 0.816 0.784 0.800 0.816 v in =15v, io=0.2a v in =15v, io=0.2a 0.1 0.1 v in =15v, io=0.2a, tc=0 to 100 cv in =15v, io=0.2a, tc=0 to 100 c 83 83 v in =15v, io=2a v in =15v, io=2a 270 300 330 270 300 330 v in =15v, io=2a v in =15v, io=2a 80 80 v in =10 to 30v, io=2a v in =10 to 30v, io=2a 50 50 v in =15v, io=0.2 to 3.5a v in =15v, io=0.2 to 3.5a 3.6 3.6 v in =15v v in =15v 0.5 630 v in =15v, v ss =0v 0.8 2.0 6 100 vc=2v 66 v in =15v, io=0a v in =15v, io=0a 200 600 30 200 v in =15v, vss=0v v in =15v, vc=2v si-8001fde si-8001fde ss 5ss 5ss c3 c3 5 v o. on/off soft start soft start +vo. on/off si-8001fde surface mount, separate excitation step-down switching mode SI-8000FD series applications ?dvd recorder, fpd-tv ?oa equipment, such as printers ?onboard local power supplies
33 ics external dimensions (to263-5) (unit : mm) pin assignment 1 in 2 sw 3 gnd (common to the rear side of the product) 4 v adj 5 ss or vc plastic mold package type flammability: ul 94v-0 product mass: approx. 1.48g (0.40) 2.54 0.3 (4.6) 9.2 0.2 1.2 0.2 4.9 0.2 (0.75) 2.0 0.1 15.3 0.3 9.9 0.2 case temperature measurement point (15 ) (0.5) 2-r0.3 10.0 0.02 3-r0.3 (r0.3) (r0.3) 0.88 0.10 1.5 dp: 0.2 (1.7 0.25 ) 12345 (1.7 0.25 ) 0.8 0.1 4.5 0.2 1.3 0.10 0.15 2.4 0.2 +0.10 ?.05 (3 ) (3 ) (3 ) (3 ) (3 ) 0 to 6 15.30 0.3 (6.8) 9.2 0.2 4.9 0.2 (1.75) (2 r0.45) (1.7 0.25 ) (1.7 0.25 ) 0.8 0.1 10.0 0.2 (4.4) (8.0) block diagram 4 3 gnd 2 in ss sw v adj 1 5 preg. ocp reset osc + comp. error amp. latch & drive tsd on/off soft start + + v ref si-8001fde si-8001fdl 4 3 gnd 2 v in v c sw adj 1 5 preg. ocp reset osc comp. error amp. latch & drive tsd on/off v ref t ypical connection diagram c 1 : 470 f c 2 : 680 f c 3 : 0.1 (only when using soft-start function) l 1 :47 h di : spb-g56s (sanken) in c 1 c 3 di l1 r1 r2 c 2 v in gnd ss gnd SI-8000FDe sw i adj adj 12 4 3 5 + + v out gnd c 1 : 470 f c 2 : 680 f l 1 :47 h di : spb-g56s (sanken) in c 1 di l1 r1 r2 c 2 v in gnd vc gnd si-8001fdl sw i adj adj 12 4 3 5 + + v out gnd SI-8000FD series
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