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Ordering number : ENN7193
Monolithic Digital IC
LB1941T
Constant Current Forward/Reverse Driver IC for Digital Cameras
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.
Package Dimensions
unit: mm 3245A-MSOP8
[LB1941T]
3.0
0.08
(0.85) 1.1max
Constant current control (IO = 400 mA when Rf = 0.5 ) Ultraminiature package (MSOP8: 150 mil) Built-in thermal protection circuit Includes a rapid charge/rapid discharge circuit for stable shutter operation. * Built-in reference voltage circuit (0.2 V typical) * * * *
0.65 (0.53)
1
4
0.25 0.125
3.0 4.9
SANYO: MSOP8
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Output current Output applied voltage Input applied voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max IO max VO max VIN max Pd max Topr Tstg IN1, IN2 Mounted on a specified board.* Conditions Ratings -0.3 to +10.5 600 -0.3 to VCC + 0.3 -0.3 to +10.5 400 -20 to +75 -55 to +150 Unit V mA V V mW C C
Note*: Mounted on a board (114.3 x76.1 x1.6 mm3: glass epoxy resin).
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO 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 products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
N2502AS (OT) No. 7193-1/4
0.5
Functions and Features
8
5
LB1941T Allowable Operating Range at Ta = 25C
Parameter Function-guaranteed voltage range Constant-current set range Input low level voltage Input high level voltage Symbol VOPR IOUT VIL VIH Set with RFG-GND resistance IN1, IN2 IN1, IN2 Conditions Ratings 2.5 to 10 50 to 500 -0.3 to +0.5 2.0 to 10 Unit V mA V V
Electrical Characteristics at Ta = 25C
Parameter Standby Current dissipation [Constant-current H bridge drive circuit] Output saturation voltage Output constant current Temperature dependence of output constant current (reference Ta = 25C) Operating current dissipation Thermal protection operating temperature [Control input circuit] Control pin maximum input current IIH IIL VIH = 5.5 V, VCC = 5.5 V VIL = GND -- -1 80 -- 100 0 A VO(sat)1 VO(sat)2 IOUT IO ICC TSD VCC = 3 V, IO = 200 mA (Upper + Lower side) VCC = 4 V, IO = 400 mA (Upper + Lower side) VCC = 4 V, RL = 3 , RF = 0.5 VCC = 4 V, RL = 3 , RF = 0.5 * (Ta = -10 to +60C) VCC = 4 V, RL = 0 (No load, full drive) * -- -- 375 -2 -- 150 0.20 0.50 400 -- 14 180 0.35 0.70 424 +2 21 210 V mA % mA C Symbol ISTB VCC = 8.5 V Conditions Ratings min -- typ -- max 1.0 Unit A
Note*: Design guarantee: Characteristics shown here are design targets and measurement with independent unit is not made before shipment.
500
Pd max -- Ta
Specified board
Allowable power dissipation, Pd max -- mW
400
300
200
192
100
0 --20
Mounted on a board: 114.3 x 76.1 x 1.6mm3 glass epoxy resin
0 20 40 60 80 100 ILB01541
Ambient temperature, Ta -- C
No. 7193-2/4
LB1941T Truth Table
Input IN1 L H L H IN2 L L H H Output OUT1 OFF H L OFF OUT2 OFF L H OFF Mode Standby 1* Forward rotation Reverse rotation 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 Reverserotation Standby Standby IN1 IN2
Pin Assignment
IN1
1
8
VCC
IN2
2
7
OUT1
FC
3
6
OUT2
GND
4 (Top view)
5
RFG
No. 7193-3/4
LB1941T Block Diagram
RL OUT1 OUT2
VCC
Reference voltage
+ 0.2V -Constant current control amplifier
IN1 Logic circuit C P U IN2
Boost charge circuit Boost discharge circuit
GND
Thermal protection circuit FC RFG RF
0.01F
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 0.1 F is recommended. Note that increase in the capacitor value results in increase in the time necessary for the constant current control to rise.
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. 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. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or 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 products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of November, 2002. Specifications and information herein are subject to change without notice. PS No. 7193-4/4

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