Ordering number : EN7232B LB1940T LB1940U http://onsemi.com Monolithic Digital IC 2-ch H-Bridge Constant Current Driver Overview The LB1940T and LB1940U are 2-phase exciter type bipolar stepper motor driver ICs that feature low-voltage, (supporting 3V battery) and low current operation with low saturation voltage. These ICs enable constant-current control of actuators, and are optimal for driving the actuators of PC peripherals such as USB compatible scanners, FDDs, and printers, as well as for controlling the shutter, iris, and AF of a digital still camera. Features • Low-voltage driving 2-power source type: VS = 1.6 to 7.5V, VDD = 1.9 to 6.5V Single power source type: VS = VDD = 1.9 to 7.5V • Low saturation output: VO(sat) = 0.3V at IO of 200mA • Constant-current control • Built-in reference voltage (Vref = 0.9V) • Small-sized, low-profile package (LB1940T: TSSOP20; 225mil; thickness (t) = 1.2mm max.) (LB1940U: MSOP20; thickness (t) = 0.85mm max.) Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Symbol Conditions Ratings Unit Maximum supply voltage VB max VS1, VS2, VDD -0.3 to +10.5 Output applied voltage VOUT max OUT1, OUT2, OUT3, OUT4 -0.3 to +10.5 Output Current IO max 400 V V mA Input applied voltage VIN max ENA1, ENA2, IN1, IN2, VC Allowable power dissipation Pd max Mounted on a specified board * Operating temperature Topr -20 to +85 °C Storage temperature Tstg -55 to +150 °C -0.3 to +10.5 800 V mW * Mounted on a Specified board: 114.3mm×76.1mm×1.6mm, glass epoxy 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 D0512HK 20080624-S00002,B8-5952/D2706 MS IM/93004 JO IM No.7232-1/8 LB1940T, LB1940U Allowable Operating Range at Ta = 25°C Parameter Function-guaranteed voltage range Symbol Conditions Ratings min typ unit max VOPR1 VDD system, VS = 2.0V 1.9 6.5 VOPR2 VS system, VDD = 5.0V 1.6 7.5 V Low level input threshold voltage VIL ENA1, ENA2, IN1, IN2 -0.3 1.0 V High level input threshold voltage VIH ENA1, ENA2, IN1, IN2 2.0 6.0 V VC input voltage VC 0.19 1.0 V Electrical Characteristics at Ta = 25°C, VS = 3V, VDD = 5V Parameter Standby current dissipation Symbol ISTB Conditions Ratings min typ VS = VDD = 6.5V unit max 0.1 1.0 0.95 μA Regulator output circuit VREF output voltage VREF IOL = 0 to 1mA 0.85 0.9 SVDD output voltage VSVDD IOL = 10mA 4.70 4.85 V VO(sat)1 VDD = 5.0V, VS = 2.0V IO = 200mA (PNP side) 0.20 0.30 V VO(sat)2 VDD = 5.0V, VS = 2.0V IO = 200mA (NPN side) 0.10 0.15 V IOUT1 VDD = 6.0V, VC = 0.2V, VS = 3.5V RL = 5Ω (between OUT-OUT), RFB = 2Ω 94 100 106 mA 180 200 220 mA 1.5 3 mA 4 7 mA -1 μA 100 μA V H bridge output circuit OUT output saturation voltage (at saturation control) OUT output current (at constant current control) IOUT2 VC = Rb Ra + Rb VREF (Ra = 70kΩ, Rb = 20kΩ) * VDD = 6.0V, VS = 2.0V RL = 5Ω (between OUT-OUT), RFB = 1Ω VS system operating current IS1 VC = consumption VDD system operating current dissipation IDD1 VC = Rb Ra + Rb Rb Ra + Rb VREF (Ra = 70kΩ, Rb = 20kΩ) * VREF (Ra = 70kΩ, Rb = 20kΩ) * ENA1 = 2V VC input current IVC VDD = 6.0V, VS = 2.0V, VC = 1.9V IIH VIH = 5.5V 0 Control input circuit Control pin maximum input current IIL VIL = GND 80 -1 0 * For Ra and Rb, refer to Application Circuit Diagram. No.7232-2/8 LB1940T, LB1940U Package Dimensions Package Dimensions unit : mm (typ) 3246 unit : mm (typ) 3262 [LB1940T] 5.2 0.5 6.5 20 11 [LB1940U] 11 0.5 6.3 4.4 4.4 6.4 20 1 0.22 10 0.15 (1.0) 1.2max 0.65 (0.3) 1 10 (0.35) 0.125 0.2 0.85max (0.65) 0.08 0.5 0.08 SANYO : TSSOP20(225mil) SANYO : MSOP20(225mil) Pd max - Ta Allowable Power Dissipation, Pd max - mW 1000 800 Mounted on a Specified board: 114.3mm×76.1mm×1.6mm glass epoxy 800mW 600 400 200 0 LB1940T/U --20 0 20 40 60 Ambient Temperature, Ta- °C 80 100 ILB01486 True Table Input Output ENA IN 1 2 L L H 1 OUT 2 SVDD 3 Mode 1 2 4 H L H on L H L on Forward rotation Standby (current dissipation zero) H H L A blank means “don’t care”. Reverse rotation L H on Reverse rotation H L on Forward rotation A blank means “off”. No.7232-3/8 LB1940T, LB1940U Pin Assignment VC1 1 20 VS1 S-GND 2 19 SVDD VS1 1 20 VC1 SVDD 2 VC2 3 18 V DD Vref 4 17 OUT1 ENA1 5 ENA2 6 VDD 3 18 VC2 OUT1 4 17 Vref RFG1 5 16 ENA1 LB1940U OUT2 6 16 RFG1 LB1940T 19 S-GND 15 ENA2 OUT3 7 14 IN1 RFG2 8 13 IN2 15 OUT2 IN1 7 14 OUT3 OUT4 9 12 FC1 IN2 8 13 RFG2 VS2 10 11 FC2 FC1 9 12 OUT4 FC2 10 Top view 11 VS2 Top view Pin Description Pin No. Pin LB1940T LB1940U Name 1 20 VC1 Pin No. Description Reference voltage input for 1ch Pin LB1940T LB1940U Name 11 10 VS2 Description Motor power supply (+) control 2 19 S-GND GND for control system 12 9 OUT4 Motor drive output 4 3 18 VC2 Reference voltage input for 2ch 13 8 RFG2 Constant-current detection pin 4 17 Vref Reference voltage output 14 7 OUT3 Motor drive output 3 5 16 ENA1 Signal input for 1ch control 15 6 OUT2 Motor drive output 2 6 15 ENA2 Signal input for 2ch control 16 5 RFG1 Constant-current detection pin 1 control 7 14 IN1 Signal input for 1ch control 17 4 OUT1 Motor drive output 1 8 13 IN2 Signal input for 2ch control 18 3 VDD Control system power supply (+) 9 12 FC1 C connection pin for 1ch phase 19 2 SVDD 20 1 VS1 Control system power output compensation 10 11 FC2 C connection pin for 2ch phase Motor power supply (+) compensation No.7232-4/8 + -- FC1 VS1 RFG1 OUT1 300Ω 65kΩ 65kΩ ENA2 VDD-SW Reference voltage logic circuit VDD IN1 65kΩ ENA1 OUT2 IN2 65kΩ S-GND VC1 VREF OUT3 SVDD OUT4 RFG2 VS2 FC2 + -- VC2 LB1940T, LB1940U Block Diagram 300Ω 80kΩ 80kΩ 80kΩ 80kΩ No.7232-5/8 LB1940T, LB1940U Application Circuit Diagram VDD VS2 VS1 ENA1 OUT1 ENA2 CPU IN1 IN2 OUT2 LB1940T LB1940U OUT3 OUT4 S-GND FC1 SVDD FC2 Vref Ra VC1 VC2 RFG1 RfB RFG2 RfB Rb At constant-current control: The OUT current is controlled so that the RFG pin voltage is equal to the VC input pin voltage. For example, IOUT = 200mA (= 0.2V/1Ω) when VC = 0.2V and RFB = 1Ω. *: There is no priority relationship between respective input voltages (ENA, IN) and respective supply voltages (VDD, VS). For example, operation with VIN = 5V, VDD = 3V, VS = 2V is possible. Note: The input voltage range to the reference voltage input pin VC for constant-current setting is from 0.19V to 1.0V. Constant current setting The composition of the constant-control circuit of this IC is as shown in the figure below. The voltage entered in the VC pin is entered as a reference to the “+” side input of the constant-current control amplifier. The “-” side of this constant-current control amplifier is connected to the RFG pin via the wire bonded resistor Rb (= 0.1Ω). The constant-current control circuit consists of comparison of the voltage generated at the external current detection resistor with the above reference voltage. In addition, since the bias current Ib (= 1.5μA) flows out of the positive (+) input of the constant current control amplifier during the constant current control, if the voltage is input to the VC pin by dividing the VREF voltage by 4.5 according to the dividing resistance (70kΩ and 20kΩ) as shown in the figure, the formula for calculating the VC voltage is as follows : VC = VREF/4.5+Ib×20kΩ = VREF/4.5+0.03 Therefore, the theoretical equation to set the constant current IOUT is as follows: IOUT = VC/(RFB+Rb) = (VREF/4.5+0.03)/(RFB+Rb) No.7232-6/8 LB1940T, LB1940U No.7232-7/8 LB1940T, LB1940U 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. 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