32207 ti pc b8-5899,7386 no.7231-1/7 http://onsemi.com semiconductor components industries, llc, 2013 june, 2013 lb1937t overview the lb1937t is a 2-phase bipolar drive stepping motor driver ic that supports low-voltage drive and can drive two stepping motors at the same time. the lb1937t's miniature package and minimal number of external components reduces the required mounting area. it also provides hi gh-efficiency motor drive an d can reduce circuit current consumption. since it provides a current detection pin and supports pwm control input, it can be used to implement current chopper control at the system level. the lb1937t is optimal for the stepping motors used for lens drive in digital cameras, printers, and movie cameras. functions and features ? low saturation voltage forward/reverse motor driver (v o sat = 0.3v at i o = 200ma) ? four h-bridge channels ? wide usable voltage range (allowable voltage range: 2.5v to 9.5v, absolute maximum rating: 10.5v) ? supports pwm input (low power consumption can be achieved in slow delay mode that uses in1/in2 = h/h logic.) ? motor (coil) current detection pin ? built-in thermal shutdown circuit ? thin form factor mini ature package (tssop24) monolithic digital ic 1-2 phase excitation stepping motor driver orderin g numbe r : EN7231
lb1937t no.7231-2/7 specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit v cc max -0.3 to +10.5 v maximum supply voltage vs max -0.3 to +10.5 v maximum output voltage v out max vs+ vsf v input voltage v in max -0.3 to +8.0 v ground pin source current ignd max per channel 800 ma allowable power dissipation pd max when mounted on a circuit board * 1100 mw operating temperature topr -30 to +85 c storage temperature tstg -40 to +150 c * specified circuit board : 114.3 76.1 1.6mm 3 , glass epoxy allowable operating range at ta = 25 c parameter symbol conditions ratings unit v cc 2.5 to 9.5 supply voltage vs 2.5 to 9.5 v high-level input voltage v ih 2.0 to 7.5 v low-level input voltage v il -0.3 to 0.7 v electrical characteristics at ta = 25 c, v cc = vs = 5v ratings parameter symbol conditions min typ max unit i cc 0 in1 to in8 = 0v 0.1 5 a v cc system power supply current i cc 1 in1 = in3 = 3v 10 16 ma is0 in1 to in8 = 0v 0.1 5 a vs system power supply current is1 in1 = in3 = 3v 13 19 ma v out 1 v cc = vs = 3v to 7.5v, v in = 3v or 0v, i out = 200ma (high and low side) 0.3 0.4 v output saturation voltage v out 2 v cc = vs = 4v to 7.5v, v in = 3v or 0v, i out = 400ma (high and low side) 0.6 0.8 v input current i in v in = 5v 150 200 a spark killer diode reverse current is(leak) 30 a forward voltage vsf i out = 400ma 1.7 v stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above the recommended oper ating conditions is not implied. extended exposure to stresses above the recommended operating conditions may affect device reliabili ty.
lb1937t no.7231-3/7 package dimensions unit:mm (typ) 3260a pin assignment sanyo : tssop24(225mil) 6.4 0.5 4.4 (0.5) (1.0) 6.5 0.5 0.15 1 12 24 13 0.22 0.08 1.2max 22 24 2 0 1 8 1 9 2 1 v cc 2 3 1 5 7 6 4 8 vs in1 in2 in3 in4 in8 out5 out4 p-gnd out1 top view 9 10 11 12 13 14 15 1 6 1 7 23 s - gnd in5 in6 in7 vs p - gnd out8 out7 out6 p - gnd out3 out2 (nc) lb1937t 0 1000 1100 600 200 400 800 1200 -40 - 30 10 0 80 60 20 -20 40 0 572.00 ambient temperature, ta ? c allowable power dissipation, pd max ? mw pd max ? ta mounted on the specified circuit board specified circuit board : 114.3 76.1 1.6mm 3 glass epoxy board
lb1937t no.7231-4/7 block diagram control block thermal shutdown s-gnd stepping motor 10 30k 30k 30k 30k 30k 30k 30k 30k 30k 30k 30k 30k 30k 30k 30k 10
lb1937t no.7231-5/7 truth table input output in1 in2 in3 in4 in5 in6 in7 in8 out1 out2 out3 out4 out5 out6 out7 out8 output mode l l off off (1) l h l h (2) h l h l (3) h h off h (4) (*) (*) h off (4) l l off off (5) l h l h (6) h l h l (7) h h off h (8) (*) (*) h off (8) l l off off (11) l h l h (12) h l h l (13) h h off h (14) (*) (*) h off (14) l l off off (15) l h l h (16) h l h l (17) h h off h (18) (*) (*) h off (18) l : low, h : high *: the output logic mode w hen in1/in2 = h/h is determined by the immediately preceding in1/in2 mode. the post-switching output modes will be as follows. when switching from (2): (4) when switching from (3): (4)' when switching from (1): undefined (either (4) or (4)') the modes when in3/in4 = h/h operat e similarly as described below. when switching from (6): (8) when switching from (7): (8)' when switching from (5): undefined (either (8) or (8)')
lb1937t no.7231-6/7 0 20 15 10 5 012345678910 0 20 15 10 5 01 23 4 5 6 78910 0 250 200 150 100 50 0.2 0.7 0.6 0.5 0.4 0.3 0123456789 0 25 20 15 10 5 -40 -20 0 20 40 60 80 100 120 140 -40 -20 0 20 40 60 80 100 120 140 0 15.0 10.0 12.5 7.5 2.5 5.0 0 0.50 0.75 0.25 -40 -20 0 20 40 60 80 100 120 140 0 100 200 400 300 500 supply voltage, v cc ? v supply voltage, v s ?v input voltage, v in ?v ambient temperature, ta ? c ambient temperature, ta ? c ambient temperature, ta ? c i cc -- v cc i s -- v s i cc -- ta i s -- ta i in -- v in v o (sat) -- i o v o (sat) -- ta supply current, i cc ?ma supply current, i cc ?ma output current, i o ?ma output saturation voltage, v o (sat) ?v output saturation voltage, v o (sat) ?v supply current, i s ?ma input current, i in ? a supply current, i s ?ma high and low side high and low side in1 to in8
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