led driver ic with built-in 16bit shift register BD7851FP description dimension (units : mm) applications the BD7851FP is a constant-current output led driver that incorporates a shift register and latch circuit, which drives 16 led lamps. output value of the constant-current can be set from 1ma to 50ma (max.) by a single external resistor. in addition, this ic incorporates a thermal-shut-down circuit which detects the ic temperature rising and turns the constant-current output off. 01w079b 1) drive capability: constant-current output 50ma (max.) 2) can set the constant-current output value by one external resistor. 3) 3 wire serial (data, clock, latch) control from micro computer 4) with enable pin 5) power on reset function 6) built-in thermal-shut-down circuit 7) low power consumption 8) cascade connection 9) allows multiple led displays due to the dynamic operation. 10) small power package hsop25 hsop25 all sets having micro computers and led displays april, 2001 features absolute maximum ratings (ta=25?c) power supply voltage input voltage output voltage power dissipation parameter symbol limits unit vcc v i vo pd 10 0 * ~ 7.0 0 ~ vcc+0.3 0.3 ~ 1450 v v w storage temperature range operating temperature range tstg topr +150 55 ~ +85 20 ~ ? c ? c v * derating : 11.6mw/ ? c for operation above ta=25 ? c pcb (70mm 70mm 1.6mm glass epoxy board) 2.75 0. 1 1.95 0. 1 1.9 0. 1 0. 1 1 0.8 5.4 0.2 7.8 0.3 1 25 0.3min. 0.36 0. 1 0. 15 13 14 0.25 0. 1 13.6 0.2
application circuit power supply voltage recommended operating conditions (ta=25?c ) parameter input voltage "l" level input voltage "h" level 4.5 min. gnd 0.8 vcc 5.5 max. 0.2 vcc vcc v unit v v ty p. v cc symbol v il v ih output voltage "h" output voltage "l" electrical characteristics (unless otherwise noted; ta=25 ? c, vcc=5.0v) g r _ i r s _ in ou t1 6 ou t1 5 ou t1 4 ou t1 3 ou t1 2 ou t1 0 ou t 9 ou t 8 ou t 7 bd7 85 1f p ou t 6 ou t 4 ou t 3 ou t 2 ou t 1 sout c l ock power suppl y v cc 2 5 24 22 21 2 0 1 9 1 8 17 1 5 14 1 3 12 1 0 9 8 7 4 lat ch c ontrol circui t shift re g iste r output buffer p 5 6 - com 0.5 48 5.0 1.8 4.0 1.0 3.0 6.5 40 55 5.9 v v ma ma ma ma ma ma v ol i olc1 0.7 30 icc consumption current constant-current output current (including error between bits) i oh =1ma i oh = 1ma r=13k ? , out1~out16:off r=1.3k ? , out1~out16:off r=13k ? , out1~out16:on r=1.3k ? , out1~out16:on v out =2.0v r=1.3k ? v out =2.0v r=13k ? 1 6 1 6 0.01 0.8 % %/v ma 0.5 62 6.8 i olc2 ? i olc i ? vcc i oh constant-current output current error between bits output current regulation against output voltage output leak current v out =2.0v r=1.3k ? (1bit on mode) v out =2.0~3.0v r= 1.3k ? v out =10v symbol min. max. unit conditions ty p. parameter
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