53012 sy 20120522-s00002/41812 sy/ 32112 sy 20120229-s00010 no.a2036-1/6 http://onsemi.com semiconductor components industries, llc, 2013 june, 2013 LB1848MC overview the LB1848MC is 2-channel low-voltage, low saturation voltage type bidirectional motor driver ic that is optimal for use as 2-phase stepping motor drivers in printers, cameras an d other portable equipment. th e output circuits are of the bipolar type, with pnp transistors in the upper side and npn transistors in the lower side, and they achieve low saturation output and low power characteristics despite being provided in a miniature package. the LB1848MC products can directly c ontrol a motor from signals from a microcontroller. the LB1848MC is optimal for 2-phase excitation drive for 2-phase stepping motors using 3-input logic (ena, in1 and in2). another point is that these ic include built-in thermal shutdown circuits so that ic scorching or burning is prevented in advance even if the ic output is shorted. functions ? optimal for 2-phase excitation drive for 2-phase stepping motors ? standby current: zero ? low saturation voltage. v o (sat) = 0.55v typical at i o = 400ma ? thermal shutdown circuit ? through-current prevention circuit ? no limitations on the magnitude relationship between the power supply voltage (v cc ) and the input voltage (v in ) ? ?soft off? function that reduces power supply line noise when switching from drive to standby modes. (requires the use of one external capacitor.) specifications absolute maximum ratings at ta = 25 c parameter symbol conditions ratings unit maximum supply voltage v cc max -0.3 to +8.0 v output voltage v out v cc + v sf v input voltage v in -0.3 to +8.0 v ground pin outflow current i gnd per channel 800 ma allowable power dissipation pd max when mounted* 820 mw operating temperature topr -20 to +85 c storage temperature tstg -40 to +150 c *1: when mounted on the specified printed circuit board (114.3mm 76.2mm 1.5mm), glass epoxy board caution 1) absolute maximum ratings represent the va lue which cannot be exceeded for any length of time. caution 2) even when the device is used within the range of abso lute maximum ratings, as a result of continuous usage under hig h temperature, high current, high voltage, or drastic temperature change, the reliability of the ic may be degraded. please contact us for the further detai ls. monolithic digital ic low-voltage/low saturation voltage type bidirectional motor driver orderin g numbe r : ena2036b 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.
LB1848MC no.a2036-2/6 allowable operating ranges at ta = 25 c parameter symbol conditions ratings unit supply voltage v cc 2.5 to 7.5 v input high-level voltage v ih 2.5 to 7.5 v input low-level voltage v il -0.3 to +0.7 v electrical characteristics at ta = 25 c, v cc = 5v ratings parameter symbol conditions min typ max unit i cc 0 ena = 0v, v in = 3v or 0v - 0.1 10 a current drain i cc 1 ena = 3v, v in = 3v or 0v - 25 35 ma v out 1 ena = 3v, v in = 3v or 0v, v cc = 3 to 7.5v, i out = 200ma - 0.27 0.4 v output saturation voltage v out 2 ena = 3v, v in = 3v or 0v, v cc = 4 to 7.5v, i out = 400ma - 0.55 0.8 v i in v in = 5v - 75 100 a input current i ena ena = 5v - 85 110 a spark killer diode reverse current i s (leak) - - 30 a forward voltage v sf i out = 400ma - - 1.7 v package dimensions unit : mm (typ) 3426a sanyo : soic10 4.9 3.9 6.0 6 10 5 1 0.835 0.21 0.37 0.41 1.0 0.175 1.5 1.75 max pd max -- ta 0 400 427 200 600 1000 800 820 60 40 80 100 020 -- 2 0 allowable power dissipation, pdmax - mw ambient temperature, ta - c
LB1848MC no.a2036-3/6 pin assignment block diagram note: when the ?soft off? function is used, a capacitor must be connected to the sof pin. if this function is not used, this pi n must be left open with absolutely no signals or lines connect. truth tables ena in1 in2 out1 out2 out3 out4 l - - off off off off l l h l h l l h h l l h h h l h l h h h l l h h l note: *1 "-" indicates a "don ? t care" input. v cc out1 stepping motor out2 out3 out4 in1 in2 ena sof* gnd thermal shutdown circuit control block 102 to 103 out4 10 out3 9 out1 8 out2 7 gnd top view 6 v cc 1 in2 2 ena 3 sof 4 in1 5 LB1848MC
LB1848MC no.a2036-4/6 sof pin (?soft off? function) operation the soft off function reduces power supply line noise due to the kickback current generated when the stepping motor drive mode is switched from drive to standby. the ?soft off? function provided by this ic operates when a capacitor (0.001 to 0.01 f) is connected between the sof pin and ground. (leave the sof pin open to disable the soft off function.) the waveforms for each pin are shown below. ena in1 in2 out1 out2 out3 out4 v cc sof no kickback noise
LB1848MC no.a2036-5/6 (cautions) pay attention to following two points in an application where the capacitor to gnd is connected to the sof pin: (1) sudden startup of vcc power supply causes charging of the capacitor from the ic inside vi a the sof pin at startup. during charging, the state equivalent to the one with the ena input at ? h ? occurs, causing output of the corresponding logic to the output pin, which may result in driving of the lo ad. (the output time period is dependent on the capacity of capacitor; about 2 ms for 0.01 f.) (2) to transfer from the drive mode to the standby mode by changing the ena input from ?h? to ?l?, the capacitor is charged from the ic inside via the sof pin as in the case of above (1). during this charge period, the ena input keeps the ?h? condition in ic. by changing in1/in2 input at this time point, the output can be changed. (the time period is equal to that of (1) above.) 60kw q1 r1 r2 q2 43kw 80kw 300w v cc ena sof gnd drive circuit external capacitor [sof pin internal equivalent circuit diagram] 8 6 24 7 59 13 0 0 10 20 30 40 50 8 6 24 7 59 13 0 i in -- v in 0 40 80 120 160 200 240 280 v cc =v in , in1 / 2 / 3 / 4=h / l / h / l v cc =5v 0 0.2 0.4 0.6 0.8 1.0 0.7 0.5 0.1 0.3 0.6 0.4 0 0.2 v out -- i out v cc =v in =4.0v i cc - v cc characterstics power-supply voltage, v cc - v current drain, i cc - ma input current, i in - a output saturation voltage, v out - v input voltage, v in - v input current, i out - a
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