Ordering number : ENA2036B LB1848MC Monolithic Digital IC Low-Voltage/Low Saturation Voltage Type Bidirectional Motor Driver http://onsemi.com 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 and other portable equipment. The 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 control 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. VO (sat) = 0.55V typical at IO = 400mA • Thermal shutdown circuit • Through-current prevention circuit • No limitations on the magnitude relationship between the power supply voltage (VCC) and the input voltage (VIN) • “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 VCC max -0.3 to +8.0 V Output voltage VOUT VCC + VSF V Input voltage VIN Ground pin outflow current IGND Per channel Allowable power dissipation Pd max When mounted* Operating temperature Topr -20 to +85 °C Storage temperature Tstg -40 to +150 °C -0.3 to +8.0 V 800 mA 820 mW *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 value which cannot be exceeded for any length of time. Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details. Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. Semiconductor Components Industries, LLC, 2013 June, 2013 53012 SY 20120522-S00002/41812 SY/32112 SY 20120229-S00010 No.A2036-1/6 LB1848MC Allowable Operating Ranges at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage VCC 2.5 to 7.5 Input high-level voltage VIH 2.5 to 7.5 V V Input low-level voltage VIL -0.3 to +0.7 V Electrical Characteristics at Ta = 25°C, VCC = 5V Parameter Symbol Current drain Output saturation voltage min typ Unit max ICC0 ENA = 0V, VIN = 3V or 0V - 0.1 10 µA ICC1 ENA = 3V, VIN = 3V or 0V - 25 35 mA VOUT1 ENA = 3V, VIN = 3V or 0V, VCC = 3 to 7.5V, IOUT = 200mA ENA = 3V, VIN = 3V or 0V, VCC = 4 to 7.5V, IOUT = 400mA - 0.27 0.4 V - 0.55 0.8 V IIN VIN = 5V - 75 100 µA IENA ENA = 5V - 85 110 µA - - 30 µA - - 1.7 V VOUT2 Input current Ratings Conditions Spark Killer Diode Reverse current IS (leak) Forward voltage VSF IOUT = 400mA Package Dimensions unit : mm (typ) 3426A 4.9 10 Pd max -- Ta 6 1.75 MAX 0.21 Allowable power dissipation, Pdmax - mW 5 0.41 1.5 1.0 820 800 600 SANYO : SOIC10 427 400 200 0 --20 0.175 1 0.835 0.37 6.0 3.9 1000 0 20 40 60 80 100 Ambient temperature, Ta - C No.A2036-2/6 LB1848MC Pin Assignment VCC 1 10 OUT4 IN2 2 9 OUT3 ENA 3 8 OUT1 SOF 4 7 OUT2 IN1 5 6 GND LB1848MC Top view Block Diagram VCC IN1 OUT1 Stepping Motor OUT2 ENA Thermal shutdown circuit Control block IN2 OUT3 OUT4 GND SOF* 102 to 103 Note: When the “soft off” function is used, a capacitor must be connected to the SOF pin. IF this function is not used, this pin 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 H L H H L L H H H L H L H H L L H H L Note: *1 "-" indicates a "don‛t care" input. No.A2036-3/6 LB1848MC 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 0.01µF) 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 No kickback noise VCC SOF No.A2036-4/6 LB1848MC (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 via 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 load. (The output time period is dependent on the capacity of capacitor; about 2 ms for 0.01μF.) (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.) VCC Drive circuit 300W R1 Q2 43kW Q1 R2 60kW ENA 80kW SOF External capacitor GND [SOF pin internal equivalent circuit diagram] ICC - VCC Characterstics 50 IIN -- VIN 280 VCC=5V VCC=VIN, IN1 / 2 / 3 / 4=H / L / H / L 240 Input current, IIN - μA Current drain, ICC - mA 40 30 20 200 160 120 80 10 40 0 0 0 1 2 3 4 5 6 7 8 9 Power-supply voltage, VCC - V 1 2 3 4 5 6 7 8 9 Input voltage, VIN - V VOUT -- IOUT 1.0 Output saturation voltage, VOUT - V 0 VCC=VIN=4.0V 0.8 0.6 0.4 0.2 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 Input current, IOUT - A No.A2036-5/6 LB1848MC ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. 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