Ordering number : EN7714A Monolithic Digital IC LB1948M 12V Low Saturation Voltage Drive Forward/Reverse Motor Driver Overview The LB1948M is a 2-channel low saturation voltage forward/reverse motor driver IC. It is optimal for motor drive in 12V system products and can drive either two DC motors, one DC motor using parallel connection, or a 2-phase bipolar stepping motor with 1-2 phase excitation mode drive. Features • Supports 12V power supply systems • Low saturation voltage: VO(sat) = 0.5V (typical) at IO = 400mA • Zero current drawn in standby mode • Braking function • Supports parallel connection: IO max = 1.6A, VO(sat) = 0.6V (typical) at IO = 800mA • Built-in spark killer diode • Built-in thermal shutdown circuit • Miniature package: MFP-10S (6.4mm × 5.0mm) Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Symbol Conditions VCC max Ratings Unit -0.3 to +20 V Output voltage VOUT -0.3 to +20 V Input voltage VIN -0.3 to +18 V Ground pin source current IGND Per channel 800 mA Allowable power dissipation Pd max1 Independent IC 350 mW Pd max2 Mounted on a specified board* 870 mW Operating temperature Topr -20 to +85 °C Storage temperature Tstg -40 to +150 °C * Specified board: 114.3mm × 76.1mm × 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. http://semicon.sanyo.com/en/network D2408 MS / 31004TN (OT) No.7714-1/6 LB1948M Allowable Operating Range at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage VCC 2.5 to 16 V Input high-level voltage VIH 1.8 to 10 V Input low-level voltage VIL -0.3 to +0.7 V Electrical Characteristics at Ta = 25°C, VCC = 5V Parameter Symbol Ratings Conditions min Current drain Unit typ max ICC0 IN1, 2, 3, 4 = 0V (Standby mode) 0.1 10 µA ICC1 *1 (Forward or reverse mode) 15 21 mA mA ICC2 *2 (Brake mode) 30 40 Output saturation voltage VO(sat)1 IOUT = 200mA (High Side and Low Side) 0.25 0.35 VO(sat)2 IOUT = 400mA (High Side and Low Side) 0.50 0.75 V Input current IIN VIN = 5V 85 110 µA 30 µA 1.7 V V Spark Killer Diode Reverse current IS(leak) Forward voltage VSF IOUT = 400mA *1:IN1/IN2/IN3/IN4=H/L/L/L or L/H/L/L or L/L/H/L or L/L/L/H. *2:IN1/IN2/IN3/IN4=H/H/L/L or L/L/H/H. Package Dimensions unit : mm (typ) 3086B Pd max -- Ta 10 0.63 5.0 4.4 6.4 6 0.15 0.1 (1.5) 1.7max 5 1 Allowable power dissipation, Pd max -- W 1.0 0.35 1.0 Specified board: 114.3×76.1×1.6mm3 glass epoxy board. 0.87 0.8 0.6 0.45 0.4 0.35 Independent IC 0.2 0 -20 (0.5) 0.18 0 20 40 60 80 85 100 Ambient temperature, Ta -- °C SANYO : MFP10S(225mil) Pin Assignment VCC 1 10 OUT1 IN1 2 9 OUT2 IN2 3 LB1948M 8 OUT3 IN3 4 7 OUT4 IN4 5 6 GND Top view No.7714-2/6 LB1948M Truth Table Input Output Notes IN1 IN2 IN3 IN4 OUT1 OUT2 OUT3 OUT4 L L L L OFF OFF OFF OFF L L OFF OFF H L H L L H L H Reverse H H L L Brake Standby mode Standby mode 1CH Forward L L OFF OFF H L H L Standby mode L H L H Reverse H H L L Brake 2CH Forward Block Diagram 10µF VCC 60kΩ OUT1 80kΩ IN1 M IN3 60kΩ 80kΩ 60kΩ 80kΩ IN4 Thermal shutdown circuit 60kΩ 80kΩ IN2 Control block OUT2 OUT3 M OUT4 GND No.7714-3/6 LB1948M Design Documentation (1) Voltage magnitude relationship There are no restrictions on the magnitude relationships between the voltages applied to VCC and IN1 to IN4. (2) Parallel connection The LB1948M can be used as a single-channel H-bridge power supply by connecting IN1 to IN3, IN2 to IN4, OUT1 to OUT3, and OUT2 to OUT4 as shown in the figure. (IOmax = 1.6A, VO(sat) = 0.6V (typical) at IO = 800mA) 1 VCC OUT1 10 2 IN1 OUT2 9 3 IN2 LB1948M OUT3 8 4 IN3 OUT4 7 5 IN4 GND 6 M (3) Observe the following points when designing the printed circuit board pattern layout. • Make the VCC and ground lines as wide and as short as possible to lower the wiring inductance. • Insert bypass capacitors between VCC and ground mounted as close as possible to the IC. • Resistors of about 10KΩ must be inserted between the CPU output ports and the IN1 to IN4 pins if the microcontroller and the LB1948M are mounted on different printed circuit boards and the ground potentials differ significantly. Thermal Shutdown Temperature (1) Thermal shutdown temperature The thermal shutdown temperature Ttsd is 200 ± 20°C with fluctuations. (2) Thermal shutdown operation The operation of the thermal shutdown circuit is shown in the figure below. When the chip temperature Tj is in the direction of increasing (solid line), the output turns off at approximately 200°C. When the chip temperature Tj is in the direction of decreasing (dotted line), the output turns on (returns) at approximately 125°C. 14 LB1948M Thermal shutdown reference chart VCC = 12V 100°C Output voltage, VO -- V 12 220°C Return 10 TSD operation 8 6 4 2 220°C 0 100 120 140 160 100°C 180 200 220 Chip temperature, Tj -- °C No.7714-4/6 LB1948M Thermal Shutdown Circuit Block Diagram Reference voltage circuit Thermal shutdown circuit Drive circuit Vref Function equivalent circuit Note: The above is an example of thermal shutdown circuits although there are some differences from the actual internal circuit. Thermal Shutdown Operation The thermal shutdown circuit compares the voltage of the heat sensitive element (diode) with the reference voltage and shuts off the drive circuit at a certain temperature to protect the IC chip from overheating. ICC -- VCC 40 IIN -- VIN 400 VIN = 5V VCC = 12V 30 Input current, IIN -- µA Current drain, ICC -- mA (= IN1 / IN2 or IN3 / IN4) H/H 20 H / L, L /H 10 0 L/L 0 5 10 15 300 1~ IN 100 0 20 4 200 0 5 Supply voltage, VCC -- V VO(sat) -- IO 15 VCC = 12V VCC = 12V 0.5 (IN1 0.4 e ow 0.3 nd sid L a de h ig 0.2 20 ICC -- Ta 40 Current drain, ICC -- mA Output saturation voltage, VO(sat) -- V 0.6 10 Input voltage, VIN -- V si H 30 / 2) H /H 20 H / L, L /H 10 0.1 0 0 100 200 300 400 Output current, IO -- mA 500 600 0 -40 -20 0 20 40 60 80 100 120 140 Ambient temperature, Ta -- °C No.7714-5/6 LB1948M Output saturation voltage, VO(sat) -- V 0.7 0.6 VO(sat) -- Ta VCC = 12V High side and Low side 00mA 0.5 IO= 4 0.4 300mA 0.3 200mA 0.2 100mA 0.1 0 -40 -20 0 20 40 60 80 100 120 140 Ambient temperature, Ta -- °C 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 December, 2008. Specifications and information herein are subject to change without notice. PS No.7714-6/6