? 2011, scillc. all rights reserved. www.onsemi.com publication order number: jan-2011, rev. 0 lb1838m/d lb1838m overview the lb1838m is a low-saturation two-channel bidirectional motor driver ic for use in low-voltage applications. the lb1838m is a bipolar stepper-motor driver ic that is id eal for use in printers, cameras and other portable devices. functions ? low voltage operation (2.5v min) ? low saturation voltage (upper transistor + lowe r transistor residual voltage: 0.40v at 400ma) ? built-in through-current prevention circuit ? separate logic power supply and motor power supply ? built-in spark killer diodes ? built-in thermal shutdown circuit ? compact package: mfp14s 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 v s max -0.3 to +10.5 v output applied voltage v out v s +v sf v input applied voltage v in -0.3 to +10 v ground pin flow-out current i gnd per channel 1.0 a independent ic 550 mw allowable power dissipation pd max mounted on a specified board * 800 mw operating temperature topr -20 to +75 c storage temperature tstg -40 to +125 c * specified board: 20mm 30mm 1.6mm, glass epoxy board. orderin g numbe r : en3949e monolithic digital ic low-voltage, low-saturation bidirectional motor driver
lb1838m rev. 0 | page 2 of 5 | www.onsemi.com allowable operating ranges at ta = 25 c parameter symbol conditions ratings unit v cc 2.5 to 9.0 v supply voltage v s 1.8 to 9.0 v input high-level voltage v ih 1.8 to 9.0 v input low-level voltage v il -0.3 to +0.7 v electrical characteristics at ta = 25 c, v cc = 3v ratings parameter symbol conditions min typ max unit i cc 0 ena1,2 = 0v, v in 1 = 3v or 0v 0.1 10 a current drain i cc 1 ena1 = 3v, v in 1 = 3v or 0v 12 18 ma v out 1 ena = 3v, v in = 3v or 0v, i out = 200ma 0.2 0.28 v output saturation voltage v out 2 ena = 3v, v in = 3v or 0v, i out = 400ma 0.4 0.6 v i in v cc = 6v, v in = 6v 200 a input current i ena v cc = 6v, ena = 6v 200 a output sustaining voltage v o (sus) i out = 400ma 9 v spark killer diode reverse current i s (leak) v cc 1, v s = 7v 30 a forward voltage v sf i out = 400ma 1.7 v package dimensions unit : mm (typ) 3111a pin assignment 1 v cc 2 ena1 3 out1 4 v s 1 5 out2 6 in1 7 gnd 8 vcont 14 13 12 11 10 9 gnd ena2 out3 v s 2 out4 in2 lb1838m note: both gnd pins should be connected to ground. sanyo : mfp14s(225mil) 1 14 7 8 8.0 0.15 (1.0) 1.0 0.35 1.7max (1.5) 0.1 4.4 0.63 6.4 -20 0 20 40 60 80 100 0 1000 800 600 400 200 pd max -- ta 550 330 480 ambient temperature, ta -- c allowable power dissipation, pd max -- mw independent ic with specified board specified board: 20 30 1.5mm 3 glass epoxy board.
lb1838m rev. 0 | page 3 of 5 | www.onsemi.com vcont in out out m i d v z v cc v s i d = v z r 300 ( = constant) block diagram v cc out3 v s 1 out4 gnd vcont gnd ena2 v s 2 in2 60k 80k 60k 80k out1 out2 ena1 in1 60k 80k 60k 80k stepping motor 10 f control block control block thermal shutdown note: as long as the voltages applied to v cc , v s 1, v s 2, ena1, ena2, in1, and in2 are within the limits set by the absolute maximum ratings, there are no restrictions on the relationship of each voltage level in comparison with the others (regarding which is higher or lower). (ex. v cc = 3v, v s 1, 2 = 2v, ena = in = 5v) truth table in1,2 ena1,2 out1,3 out2,4 mode l h h l forward h h l h reverse l l off off standby h l off off standby vcont pin as shown in the left diagram, the vcont pin outputs the voltage of the band gap zener v z +v f (= 1.93v). in normal use, this pin is left open. the drive current i d is varied by the vcont voltage. however, because the band gap zener is sh ared, it functions as a bridge.
lb1838m rev. 0 | page 4 of 5 | www.onsemi.com v o (sat) -- i o i in -- v in v o (sat) -- ta i s -- v s i cc -- v cc 1.0 0.8 0.6 0.4 0.2 0 200 160 120 80 40 0 0.6 0.5 0.3 0.2 0.1 0 0.4 20 16 12 8 4 0 10 8 6 4 2 0 0 100 200 300 400 500 600 012345678910 -40 -20 0 20 40 60 140 120 100 80 01 23 7 6 5 4812 11 10 9 01 23 7 6 5 4812 11 10 9 ena in1(ena = 3v) i o = 400ma i o = 200ma v cc = v s = 3v v cc = v s = in = 3v v o (sat) = total v cc = v in = 3v for 1channel v cc = v in = 3v for 1channel output current, i o -- ma output saturation voltage, v o (sat) -- v input voltage, v in -- v input current, i in -- a output saturation voltage, v o (sat) -- v ambient temperature, ta -- c current drain, i s -- ma supply voltage, v s -- v current drain, i cc -- ma supply voltage, v cc -- v reverse forward
lb1838m lb1838m/d on semiconductor and the on logo are registered trademarks of semiconductor components industries, llc (scillc). scillc reserve s the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any partic ular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation sp ecial, consequential or incidental damages. scillc strives to supply high-quality high-reliability products and recommends adopting safety measures when designing equipment to avoid accidents or m alfunctions. such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. ?typical? parameter s which may be provided in scillc data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ?typic als,? must be validated for each customer application by customer?s technical experts. scillc shall not be held liable for any claim or suits with regard to a third party?s intellectual property rights which has resulted from the use of the technical information and products mentioned above. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any o ther application in which the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or u nauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distri butors harmless against all claims, costs, damages, and expens es, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scil lc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this li terature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information literature fulfillment: literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone: 303-675-2175 or 800-344-3860 toll free usa/canada fax: 303-675-2176 or 800-344-3867 toll free usa/canada email: orderlit@onsemi.com n. american technical support: 800-282-9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81-3-5773-3850 on semiconductor website: www.onsemi.com order literature: http://www.onsemi.com/orderlit for additional information, please contact your local sales representative
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