Ordering number : EN7193B Monolithic Linear IC For Digital Cameras LB1941T Constant Current Forward/Reverse Driver IC Overview The LB1941T is a single-channel forward/reverse driver IC that provides a constant current control function. Its low-saturation output makes it appropriate for voice coil motor control, and it is optimal for use as the shutter driver IC in digital cameras. Functions • Constant current control (IO = 400mA when Rf = 0.5Ω) • Ultraminiature package (MSOP8: 150mil) • Built-in thermal protection circuit • Includes a rapid charge/rapid discharge circuit for stable shutter operation. • Built-in reference voltage circuit (0.2V typical) Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Maximum supply voltage Output current Symbol Conditions VCC max Ratings Unit -0.3 to +10.5 IO max 600 Output applied voltage VO max Input applied voltage VIN max IN1, IN2 -0.3 to VCC+0.3 Allowable power dissipation Pd max Mounted on a specified board.* -0.3 to +10.5 400 V mA V V mW Operating temperature Topr -20 to +75 °C Storage temperature Tstg -55 to +150 °C Note*: Mounted on a board: 114.3mm×76.1mm×1.6mm, glass epoxy resin. 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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 60607 MS IM / N2502 AS (OT) No.7193-1/4 LB1941T Allowable Operating Range at Ta = 25°C Parameter Symbol Function-guaranteed voltage Conditions Ratings VOPR Unit 2.5 to 10 V 50 to 500 mA range Constant-current set range IOUT Set with RFG-GND resistance Input low level voltage VIL IN1, IN2 -0.3 to +0.5 V Input high level voltage VIH IN1, IN2 2.0 to 10 V Electrical Characteristics at Ta = 25°C Parameter Symbol Ratings Conditions min Standby Current dissipation ISTB typ Unit max 1.0 µA 0.20 0.35 V 0.50 0.70 V 400 424 mA +2 % VCC = 8.5V Constant-current H bridge drive circuit Output saturation voltage VO(sat)1 VO(sat)2 Output constant current IOUT VCC = 3V, IO = 200mA (Upper + Lower side) VCC = 4V, IO = 400mA (Upper + Lower side) VCC = 4V, RL = 3Ω, RF = 0.5Ω 375 ∆IO VCC = 4V, RL = 3Ω, RF = 0.5Ω * (Ta = –10 to +60°C) Operating current dissipation ICC VCC = 4V, RL = 0Ω, (No load, full drive) Thermal protection operating TSD Design target value * Temperature dependence of output constant current -2 (reference Ta = 25°C) 150 14 21 mA 180 210 °C 80 100 µA 0 µA temperature Control input circuit Control pin maximum input IIH VIH = 5.5V, VCC = 5.5V current IIL VIL = GND -1 Note*: These items are design target values and are not tested. Package Dimensions unit : mm (typ) 3245B 0.65 0.125 1.1MAX (0.85) 0.25 Specified board 400 300 192 200 100 Mounted on a board: 114.3mm×76.1mm×1.6mm glass epoxy resin 0 --20 0 20 40 60 Ambient temperature, Ta - °C 80 100 ILB01541 0.08 (0.53) 2 Allowable power dissipation, Pd max - mW 0.5 3.0 4.9 8 1 Pd max - Ta 500 3.0 SANYO : MSOP8(150mil) No.7193-2/4 LB1941T Pin Assignment IN1 1 8 VCC IN2 2 7 OUT1 LB1941T FC 3 6 OUT2 GND 4 5 RFG Top view Block Diagram RL OUT1 OUT2 Reference voltage VCC C P U IN2 Logic circuit IN1 + 0.2V -- Constant current control amplifier Boost charge circuit Boost discharge circuit Thermal protection circuit 0.01µF GND FC RFG RF ILB01540 Boost charge and discharge circuits In order to keep the output response time constant during mode transfer from the standby state to forward (reverse) rotation, this IC incorporates boost charge and discharge circuits for external capacitor connected to the FC pin. The external capacitor connected to the FC pin is for output phase compensation (to suppress oscillation), for which 0.01 to 0.1µF is recommended. Note that increase in the capacitor value results in increase in the time necessary for the constant current control to rise. No.7193-3/4 LB1941T Truth Table Input Output Mode IN1 IN2 OUT1 OUT2 L L OFF OFF Standby 1* H L H L Forward rotation L H L H Reverse rotation H H OFF OFF Standby 2* Cautions for use Standby states 1 and 2 in the above truth table differ as follows: Standby state 1 ............All circuits in IC are not operating and the current dissipation is almost zero. Standby state 2 ............The constant-current control amplifier output in IC is in the full drive condition. Both OUT1 and OUT2 are OFF. The current dissipation is a few mA. During mode transfer from the standby state 1 to forward (reverse) rotation, the current rises from the output current zero condition to the required constant current value. On the other hand, during mode transfer from the standby state 2 to forward (reverse) rotation, full drive is applied once to the output, then the current lowers to the required current value. Therefore, select the standby 1 state when putting IC in the standby state. A typical drive sequence is shown in the figure below. Reverserotation Fowardrotation Standby Reverserotation Standby IN1 IN2 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 June, 2007. Specifications and information herein are subject to change without notice. PS No.7193-4/4