18 ics 1-1-3 dc/dc converter ics surface-mount, separate excitation step-down switching mode si-8000tm series absolute maximum ratings unit v w c c c/w c/w ratings 43 1.06 1.65 ?0 to +150 ?0 to +150 6 95 symbol v in p d1 p d2 t j t stg j-c j-a parameter dc input voltage power dissipation junction temperature * storage temperature thermal resistance (junction to case) thermal resistance (junction to ambient air) features compact surface-mount package (to252-5) output current: 1.5 a high efficiency: 81% typ. (at vo = 5 v) requires only 4 discrete components built-in reference oscillator (300 khz) built-in drooping-type-overcurrent and thermal protection circuits output on/off available (circuit current at output off: 200 a typ.) soft start available by on/off pin conditions when mounted on glass-epoxy board (900 mm 2 copper area 4.3%) when mounted on glass-epoxy board (900 mm 2 copper area 50%) when mounted on glass-epoxy board (900 mm 2 copper area 4.3%) *: this product has built-in thermal protection circuits that may operate when the junction temperature rises above 130 c. the recommended design for the junction temperature during operation is below 125 c. applications onboard local power supplies ? v equipment ? a equipment recommended operating conditions parameter input voltage range output voltage output current range operating junction temperature range operating temperature range symbol v in v o i o t jop t op ratings SI-8008TM v o +3* 1 to 40 0.8 to 24 0 to 1.5 ?0 to +100 ?0 to +85 unit v v a c c *1: the minimum value of an input voltage range is the higher of 4.5 v or v o + 3 v. electrical characteristics (t a =25 c) pa r ameter symbol unit rating SI-8008TM min. 0.784 1.6 typ. 0.800 v in =15v, i o =0.1a max. 0.816 80 reference voltage efficiency oscillation frequency line regulation load regulation overcurrent protection starting current v adj ? v oload conditions conditions conditions conditions conditions conditions conditions conditions conditions conditions 0.1 v in =15v, i o =0.1a, t c = 0 to 100 c 81 v in =15v, i o =0.5a ? v adj / ? t 10 v ssl =0v 0.5 40 10 v in =15v, i o =0.2 to 1.5a 40 300 v in =15v, i o =0.5a fo 60 v in =10 to 30v, i o =0.5a ? v oline 6 v in =15v, i o =0a v in =15v i q 200 v in =15v, v ss =0v 400 i q (off) v ssl i ssl i s v mv/ c % khz mv mv a v a ma a on/off pin* quiescent circuit current low level voltage outflow current at low voltage t emperature coefficient of reference voltage *: 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 to the power supply in the ic, so applying the external voltage is prohibited. if the pin is not used, leave it open. si-8000tm si-8000tm ss 5ss 5ss c3 c3 5 v o. on/off soft start soft start +v o. on/off si-8000tm
19 ics si-8000tm series external dimensions (to252-5) (unit : mm) block diagram t ypical connection diagram c 1 : 220 f c 2 : 470 f c 3 :1 f (only when using soft-start function) l 1 :47 f di : sjpb-h6 (sanken) 6.60 0.20 5.34 0.20 0.50 0.10 2.30 0.20 0.50 0.10 (1.00) 12345 1.27 typ 1.27 typ seating plane 0.00 to 0.127 1.10 0.20 6.10 0.20 2.70 0.20 9.90 0.30 (0.89) 0 to 8 6.60 0.20 5.34 0.20 (5.04) r 0.325 (1.50) (4.06) 2.70 0.20 9.90 0.30 0.50 0.10 2.30 0.20 1.18 0.20 0.1 4 3 gnd 2 in ss sw adj 1 5 preg. overcurrent protection reset osc + comp. error amp. latch & drive thermal protection on/off soft start reference voltage + + SI-8008TM in c 1 220 f c 3 di l47 h l 1 r1 r2 c 2 470 f v in gnd ss gnd si-8000tm sw i adj adj 12 4 3 5 + + v o gnd pin assignment q in w sw e gnd r adj t ss plastic mold package type flammability: ul94v-0 product mass: approx. 0.33 g
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