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 (I
O
= 400 mA when R
f
= 0.5
Ω)
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 = 25°C
Parameter
Maximum supply voltage
Output current
Output applied voltage
Input applied voltage
Allowable power dissipation
Operating temperature
Storage temperature
Symbol
V
CC
max
I
O
max
V
O
max
V
IN
max
Pd max
Topr
Tstg
IN1, IN2
Mounted on a specified board.*
Conditions
Ratings
–0.3 to +10.5
600
–0.3 to V
CC
+ 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
×76.1 ×1.6
mm
3
: 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 = 25°C
Parameter
Function-guaranteed voltage range
Constant-current set range
Input low level voltage
Input high level voltage
Symbol
VOPR
I
OUT
V
IL
V
IH
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 = 25°C
Parameter
Standby Current dissipation
[Constant-current H bridge drive circuit]
Output saturation voltage
Output constant current
Temperature dependence of output constant
current (reference Ta = 25°C)
Operating current dissipation
Thermal protection operating temperature
[Control input circuit]
Control pin maximum input current
I
IH
I
IL
V
IH
= 5.5 V, V
CC
= 5.5 V
V
IL
= GND
—
–1
80
—
100
0
µA
V
O
(sat)1
V
O
(sat)2
I
OUT
∆I
O
I
CC
TSD
V
CC
= 3 V, I
O
= 200 mA (Upper + Lower side)
V
CC
= 4 V, I
O
= 400 mA (Upper + Lower side)
V
CC
= 4 V, R
L
= 3
Ω,
RF = 0.5
Ω
V
CC
= 4 V, R
L
= 3
Ω,
RF = 0.5
Ω*
(Ta = –10 to +60°C)
V
CC
= 4 V, R
L
= 0
Ω
(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
V
CC
= 8.5 V
Conditions
Ratings
min
—
typ
—
max
1.0
Unit
µA
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
×
76.1
×
1.6mm
3
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
0.01µF
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 µF 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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