low-voltage/low-saturation bidirectional constant-voltage regulated motor driver overview the lb1837m is a low-voltage, low-saturation, two-channel motor driver with a bidirectional braking function that provides constant-voltage regulated output for bidirectional operation. the design of the lb1837m is ideal for video equipment, cameras, and other portable equipment. features . wide operating voltage range (3.0 to 9.0 v). . low saturation voltage v o (sat) = 0.40 v at i o = 200 ma. . consumes almost no current in standby mode (0.1 a or less). . permits setting of bidirectional constant-voltage regulated value. . built-in reference voltage coupled to input. . brake function built in. . compact mfp14s package. package dimensions unit: mm 3111-mfp14s [lb1837m] sanyo : mfp14s specifications absolute maximum ratings atta=25 c parameter symbol conditions ratings unit maximum supply voltage v cc max 10.5 v output current im max 250 ma applied input voltage v in 0.3 to +10 v allowable power dissipation pd max with board ( 30 x 30 x 1.5 mm 3 ) 800 mw operating temperature topr 20 to +80 c storage temperature tstg 40 to +125 c allowable operating ranges atta=25 c parameter symbol conditions ratings unit supply voltage v cc 3.0 to 9.0 v input [h] voltage v ih 3.0 to 9.0 v input [l] voltage v il 0.3 to +0.7 v control voltage v c 0.2 to 6.0 v ordering number: EN3948B monolithic digital ic lb1837m sanyo electric co.,ltd. semiconductor bussiness headquarters tokyo office tokyo bldg., 1-10, 1 chome, ueno, taito-ku, tokyo, 110 japan 61295ha(ii) no.3948-1/5
electrical characteristics atta=25 c, v cc =6v parameter symbol conditions min typ max unit supply current i cc 0 during standby 0.1 10 a i cc 1 (for one channel) during bidirectional operation during control, load open 23ma i cc 2 (for one channel) during bidirectional operation during saturation, load open 35ma i cc 3 during braking (for one channel) 6.5 9 ma output saturation voltage vsat1 i o = 100 ma (upper side + lower side) 0.3 0.4 v vsat2 i o = 200 ma (upper side + lower side) 0.4 0.55 v vsat3 i o = 200 ma (lower side) 0.07 0.10 0.15 v reference voltage vref ivre f=1ma 1.85 2.0 2.15 v output voltage voltage characteristics d v o d v cc v o =5v,v cc = 5.5 to 9 v, i o = 100 ma 20 mv output voltage current characteristics d v o d i cc v o =5v,v cc =6v, i o =10to100ma 50 mv input current i in v in = 5 v 90 150 a output voltage v o between out and gnd 2.5xv c 2.7xv c v equivalent circuit block diagram (for one channel) truth table input output mode in 1/3 in 2/4 out 1/3 out 2/4 l l off off standby hlhl constant-voltage regulated forward operation lhlh constant-voltage regulated reverse operation h h l l brake the constant-voltage regulated output v o (= voltage between h side output and gnd) is controlled by 2.5 x v c . the output is in the saturated state when the v c input range is 0.2 to 6 v and v o ^ v cc . pin assignment thermal reference voltage logic predriver note: both gnd pins must be grounded. lb1837m no.3948 -2/5
pin functions pin no. symbol equivalent circuit diagram pin function 14 v cc power supply pin for output and controller. 9 12 gnd gnd pins for output and controller. both must be grounded. 1 2 6 7 in2 in1 in3 in4 input pins that determine the excitation of the outputs. in1 and in2 control outputs out1 and out2; in3 and in4 control outputs out3 and out4. when inputs in1 through in4 are all low or open, the device goes into standby mode and current consumption drops to 10 a or less. l: 0.3 to +0.7 v h: 3.0 to 9.0 v there are no limitations on the magnitude relationships between the v cc and v in supply voltages. 8 10 11 13 out4 out3 out1 out2 output pins. have built-in spark killer diodes. braking provides short braking that turns on the lower transistor. 3 vref reference voltage (= 2.0 v). 4 5 v c 1 v c 2 output input pins that determine the constant- voltage regulated output level. the constant-voltage regulated output v o (= voltage between h side output and gnd) is controlled by v o =2.5xv c . there are no limitations on the magnitude relationships between the v cc ,v c 1 and v c 2 supply voltages. lb1837m no.3948 -3/5
sample application circuit if the outputs oscillate, insert capacitors of 0.001 to 0.1 f between the outputs. v o (sat) e i o specified board (30 x 30 x 1.3 mm 3 glass epoxy) ambient temperature, ta e c allowable power dissipation, pd max e mw pd max e ta output current, i o ema output saturation voltage, v o (sat) e v i in ev in input voltage, v in ev input current, i in ea vev cc supply voltage, v cc ev output voltage, v o ev no load no load lb1837m no.3948 -4/5
no products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 accept full responsibility and indemnify and defend sanyo electric co., ltd., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on sanyo electric co., ltd., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. sanyo believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. this catalog provides information as of june, 1995. specifications and information herein are subject to change without notice. lb1837m no.3948 -5/5
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