LB1848MC-AH ONSEMI | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 6

Technical content

53012 SY 20120522-S00002/41812 SY/32112 SY 20120229-S00010 No.A2036-1/6 http://onsemi.com Semiconductor Components Industries, LLC, 2013 June, 2013 LB1848MC 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 V CC max -0.3 to +8.0 V Output voltage V OUT V CC + VSF V Input voltage V IN -0.3 to +8.0 V Ground pin outflow current I GND Per channel 800 mA Allowable power dissipation Pd max When mounted* 820 mW Operating temperature Topr -20 to +85 °C Storage temperature Tstg -40 to +150 °C *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. Monolithic Digital IC Low-Voltage/Low Saturation Voltage Type Bidirectional Motor Driver Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Oper ating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

No.A2036-2/6 Allowable Operating Ranges at Ta = 25°C Parameter Symbol Conditions Ratings Unit Supply voltage V CC 2.5 to 7.5 V Input high-level voltage V IH 2.5 to 7.5 V Input low-level voltage V IL -0.3 to +0.7 V Electrical Characteristics at Ta = 25°C, VCC = 5V Ratings Parameter Symbol Conditions min typ max Unit ICC0 ENA = 0V, V IN = 3V or 0V - 0.1 10 µA Current drain ICC1 ENA = 3V, V IN = 3V or 0V - 25 35 mA VOUT1 ENA = 3V, VIN = 3V or 0V, VCC = 3 to 7.5V, IOUT = 200mA - 0.27 0.4 V Output saturation voltage VOUT2 ENA = 3V, VIN = 3V or 0V, VCC = 4 to 7.5V, IOUT = 400mA - 0.55 0.8 V IIN V IN = 5V - 75 100 µA Input current IENA ENA = 5V - 85 110 µA Spark Killer Diode Reverse current I S (leak) - - 30 µA Forward voltage V SF I OUT = 400mA - - 1.7 V Package Dimensions unit : mm (typ) 3426A SANYO : SOIC10 4.9 3.9 6.0 610 0.835 0.21 0.37 0.411.0 0.175 1.5

1.75 MAX

Allowable power dissipation, Pdmax - mW Ambient temperature, Ta - C

No.A2036-3/6 Pin Assignment Block Diagram 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 L H H L L H H H L H L H H H L L H H L Note: *1 "-" indicates a "don‛t care" input. VCC OUT1 Stepping Motor OUT2 OUT3 OUT4 IN1 IN2 ENA SOF* GND Thermal shutdown circuit Control block 102 to 103 OUT410 OUT39 OUT18 OUT27 GND Top view VCC 1 IN2 2 ENA 3 SOF 4 IN1 5 LB1848MC

No.A2036-4/6 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 VCC SOF No kickback noise

No.A2036-5/6 (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.) 60kW 43kW 80kW 300W VCC ENA SOF GND Drive circuit External capacitor [SOF pin internal equivalent circuit diagram] 8624 7 59130 8624 7 59130 IIN -- VIN 120 160 200 240 280 VCC=VIN, IN1 / 2 / 3 / 4=H / L / H / L VCC=5V 0.2 0.4 0.6 0.8 1.0 VOUT -- IOUT VCC=VIN=4.0V ICC - VCC Characterstics Power-supply voltage, VCC - V Current drain, ICC - mA Input current, IIN - μA Output saturation voltage, VOUT - V Input voltage, VIN - V Input current, IOUT - A

PS No.A2036-6/6 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 warranty, representation or guarantee regarding the suitability of its products for any particular 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 special, consequentia l or incidental damages. “Typical” parameters 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 “Typicals” must be validated for each customer application by customer’s techn ical experts. 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 other 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 productsfor any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, anddistributors harmless against all claims, costs, damages, and expenses, 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 SCILLC was negligent regarding the design or manufacture oft h e part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.