LED driver IC with built-in 16bit shift register
BD7851FP
Description
Dimension (Units : mm)
Applications
The BD7851FP is a constant-current output LED
driver that incorporates a shift register and latch
circuit, which drives 16 LED lamps. Output value
of the constant-current can be set from 1mA to
50mA (Max.) by a single external resistor.
In addition, this IC incorporates a thermal-shut-down
circuit which detects the IC temperature rising and
turns the constant-current output OFF.
01W079B
1) Drive capability: constant-current output 50mA (Max.)
2) Can set the constant-current output value by one external resistor.
3) 3 wire serial (Data, Clock, Latch) control from micro computer
4) With ENABLE pin
5) Power ON reset function
6) Built-in thermal-shut-down circuit
7) Low power consumption
8) Cascade connection
9) Allows multiple LED displays due to the dynamic operation.
10) Small power package HSOP25
HSOP25
All sets having micro computers and LED displays
April, 2001
Features
Absolute Maximum Ratings (Ta=25C)
Power supply voltage
Input voltage
Output voltage
Power dissipation
Parameter
Symbol
Limits
Unit
Vcc
V
I
Vo
PD
10
0
*
~
7.0
0
~
Vcc+0.3
0.3
~
1450
V
V
W
Storage temperature range
Operating temperature range
Tstg
Topr
+150
55
~
+85
20
~
C
C
V
*
Derating : 11.6mW/C for operation above Ta=25C PCB (70mm
70mm1.6mm glass epoxy board)
2.75
0. 1
1.95
0. 1
1.9
0.
1
0.
1
1
0.8
5.4
0.2
7.8
0.3
1
25
0.3Min.
0.36
0. 1
0. 15
13
14
0.25
0.
1
13.6
0.2
Application Circuit
Power supply voltage
Recommended Operating Conditions (Ta=25C)
Parameter
Input voltage "L" level
Input voltage "H" level
4.5
Min.
GND
0.8
Vcc
5.5
Max.
0.2
Vcc
Vcc
V
Unit
V
V
--
Typ.
--
--
V
CC
Symbol
V
IL
V
IH
Output voltage "H"
Output voltage "L"
Electrical characteristics
(Unless otherwise noted; Ta=25C, Vcc=5.0V)
G
R_Ir
S_IN
OUT16
OUT15
OUT14
OUT13
OUT12
OUT10
OUT9
OUT8
OUT7
BD7851FP
OUT6
OUT4
OUT3
OUT2
OUT1
SOUT
CLOCK
Power supply
Vcc
25
24
22
21
20
19
18
17
15
14
13
12
10
9
8
7
4
LATCH
Control circuit
Shift register
Output buffer
p
5
6
-COM
DATA
CLOCK
LATCH
ENABLE
*This product is not designed for protection against radioactive rays.
V
OH
Vcc0.5
--
--
--
--
48
5.0
--
--
--
--
1.8
4.0
1.0
3.0
6.5
40
55
5.9
V
V
mA
mA
mA
mA
mA
mA
V
OL
I
OLC1
0.7
30
Icc
Consumption current
Constant-current output current
(Including error between bits)
I
OH
=1mA
I
OH
=1mA
R=13k
, OUT1~OUT16:OFF
R=1.3k
, OUT1~OUT16:OFF
R=13k
, OUT1~OUT16:ON
R=1.3k
, OUT1~OUT16:ON
V
OUT
=2.0V R=1.3k
V
OUT
=2.0V R=13k
--
--
--
1
6
1
6
0.01
0.8
%
%/V
mA
0.5
62
6.8
I
OLC2
I
OLC
I
Vcc
I
OH
Constant-current output current
error between bits
Output current regulation
against output voltage
Output leak current
V
OUT
=2.0V R=1.3k
(1bit ON mode)
V
OUT
=2.0~3.0V R=
1.3k
V
OUT
=10V
Symbol
Min.
Max.
Unit
Conditions
Typ.
Parameter
Appendix
Appendix1-Rev1.0
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
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