Ordering number : EN3949E Monolithic Digital IC LB1838M Low-Voltage, Low-Saturation Bidirectional Motor Driver 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 ideal for use in printers, cameras and other portable devices. Functions • Low voltage operation (2.5V min) • Low saturation voltage (upper transistor + lower 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 Maximum supply voltage Symbol Conditions Ratings Unit VCC max -0.3 to +10.5 V VS max -0.3 to +10.5 V VS+VSF V Output applied voltage VOUT Input applied voltage VIN Ground pin flow-out current IGND Allowable power dissipation Pd max -0.3 to +10 V Per channel 1.0 A Independent IC 550 mW 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. 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To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 21209 MS/82599TH(II)/21097HA(II)/O1596HA(II)/4302TS(US) No.3949-1/5 LB1838M Allowable Operating Ranges at Ta = 25°C Parameter Symbol Supply voltage Conditions Ratings Unit VCC 2.5 to 9.0 VV VS 1.8 to 9.0 V Input high-level voltage VIH 1.8 to 9.0 V Input Low-level voltage VIL -0.3 to +0.7 V Electrical Characteristics at Ta = 25°C, VCC = 3V Parameter Symbol Ratings Conditions min Unit typ max ICC0 ENA1,2 = 0V, VIN1 = 3V or 0V 0.1 10 µA ICC1 ENA1 = 3V, VIN1 = 3V or 0V 12 18 mA Output saturation voltage VOUT1 ENA = 3V, VIN = 3V or 0V, IOUT = 200mA 0.2 0.28 VOUT2 ENA = 3V, VIN = 3V or 0V, IOUT = 400mA 0.4 0.6 V Input current IIN VCC = 6V, VIN = 6V 200 µA IENA VCC = 6V, ENA = 6V 200 µA VO(SUS) IOUT = 400mA Reverse current IS(leak) VCC1, VS = 7V 30 µA Forward voltage VSF IOUT = 400mA 1.7 V Current drain Output sustaining voltage 9 V V Spark killer diode Package Dimensions unit : mm (typ) 3111A Pd max -- Ta Allowable power dissipation, Pd max -- mW 1000 8.0 14 0.63 4.4 6.4 8 1 1.7MAX 1.0 0.35 0.15 0.1 (1.5) (1.0) 7 SANYO : MFP14S(225mil) 800 600 550 Specified board: 20×30×1.5mm3 glass epoxy board. With specified board Independent IC 480 400 330 200 0 -20 0 20 40 60 80 100 Ambient temperature, Ta -- °C Pin Assignment GND ENA2 OUT3 VS2 14 13 12 11 OUT4 IN2 10 Vcont 9 8 6 7 IN1 GND LB1838M 1 2 3 4 5 VCC ENA1 OUT1 VS1 OUT2 Note: Both GND pins should be connected to ground. No.3949-2/5 LB1838M Block Diagram 10µF IN1 60kΩ 80kΩ ENA1 VS2 Control block VCC VS1 OUT1 Stepping Motor OUT2 60kΩ 80kΩ IN2 Control block Thermal shutdown 60kΩ 80kΩ ENA2 OUT3 OUT4 60kΩ 80kΩ GND GND Vcont Note: As long as the voltages applied to VCC, VS1, VS2, 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. VCC = 3V, VS1, 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 VCC VS As shown in the left diagram, the Vcont pin outputs the voltage of the band gap Zener VZ +VF (= 1.93V). In normal use, this pin is left open. The drive current ID is varied by the Vcont voltage. However, because the band gap Zener is shared, it functions as a bridge. OUT IN 300Ω M ID OUT VZ ID = VZ ( = Constant) r Vcont No.3949-3/5 LB1838M VO(sat) -- IO 1.0 IIN -- VIN 200 0.8 0.6 0.4 0.2 0 A EN ) V =3 A EN 160 Input current, IIN -- µA Output saturation voltage, VO(sat) -- V VCC = VS = 3V 1( 120 IN 80 40 0 100 200 300 400 500 0 600 0 1 2 3 VO(sat) -- Ta 5 6 7 8 9 10 11 12 IS -- VS 20 VCC = VS = IN = 3V VO(sat) = total VCC = VIN = 3V For 1channel 0.5 16 A 00m IO= 4 0.4 Current drain, IS -- mA Output saturation voltage, VO(sat) -- V 0.6 4 Input voltage, VIN -- V Output current, IO -- mA 0.3 A I O = 200m 0.2 12 8 4 0.1 0 -40 -20 0 20 40 60 80 100 120 140 Ambient temperature, Ta -- °C 1 2 3 4 5 6 7 8 9 10 Supply voltage, VS -- V ICC -- VCC 10 00 VCC = VIN = 3V For 1channel Current drain, ICC -- mA 8 6 erse Rev Forward 4 2 0 0 1 2 3 4 5 6 7 8 9 10 11 12 Supply voltage, VCC -- V No.3949-4/5 LB1838M SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require the export license from the authorities concerned in accordance with the above law. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of July, 2008. Specifications and information herein are subject to change without notice. PS No.3949-5/5