Page 1
SM8144B
NIPPON PRECISION CIRCUITS INC.
EL Sheet Driver
OVERVIEW
The SM8144B is a transformer-less electroluminescent (EL) driver IC, capable of driving displays up to 80
2
cm
in size. It is a high-efficiency driv er that features re vised coil switching transistor ON resistance and output
circuit configuration to reduce loss, all in a compact package.
A microcontroller interface pin (ENA) is provided, which can be used to control the EL driver ON/OFF func-
tion. The device is available in 8-pin VSOP packages.
FEATURES
■
Dedicated EL driver
■
1.6 to 5.5 V supply voltage
■
100mA maximum operating current
(V
= 3.0V, Ta ≤ 70 ° C)
DD
■
3.5 Ω typical output resistance
■
200 Vp-p maximum EL driver voltage*
■
31 to 1500 Hz EL drive frequency range*
■
High voltage CMOS Process
■
8-pin VSOP plastic package
*: Adjustable with external resistance.
PINOUT
(Top view)
OSC
1CHV
2LDR
3VSS
8144BV
4
8 OUT1
7 OUT2
6 VDD
5
ENA
APPLICATIONS
■
Hand held PC, Palm size PC
■
Mobile IT equipment
■
White EL
ORDERING INFORMATION
De vice Pack ag e
SM8144BV 8-pin VSOP
PACKAGE DIMENSIONS
(Unit : mm)
6.4 ± 0.3
4.4 ± 0.2
0.575 typ
3.1 ± 0.3
1.15 ± 0.05
0.65
0.10
0.1 ± 0.05
0.22 ± 0.1
0.12
0 to 10
0.5 ± 0.2
0.1
+
0.05
−
0.15
M
preliminary
NIPPON PRECISION CIRCUITS—1
Page 2
BLOCK DIAGRAM
SM8144B
EL sheet
<
80cm
VDD CHVLDR OUT2OUT1
Switching Circuit
Boosting Block
2
Dividing Circuit
1/4
Oscillator for
Boosting and EL driving
VSS
When ENA is logical "H", SM8144B is active.
OSC
Oscillation Block
R
OSC
ENA from microcontroller
Dividing Circuit
1/1024
ENA
PIN DESCRIPTION
Pin number Name I / O Function
1 C H V I High-voltage DC input
2 LD R O Booster coil driver output
3 VS S – Ground
4 OSC I Coil and EL driver oscillator (oscillator frequency determined by external resistor)
5 ENA I Enable input (built-in pull-down resistor)
6 VD D – Supply
7 OUT2 O Output 2
8 OUT1 O Output 1
preliminary
NIPPON PRECISION CIRCUITS—2
Page 3
−
≤
≤
=
≤
=
≤
=
≤
=
≤
−
°
°
−
SPECIFICATIONS
Absolute Maximum Ratings
Parameter Symbol Condition Rating Unit
Supply voltage range V
Input voltage range V
Output voltage
Po w er dissipation P
Storage temperature range T
DD
V
CHV
V
LDR
V
OUT1/2
STG
IN
D
° C
−
°
°
°
°
°
SM8144B
0.3 to 7.0 V
All Input pins V
CHV pin 0.5 to 120 V
LDR pin 0.5 to 120 V
OUT1, OUT2 pin 0.5 to 120 V
T
70
C 140 m W
a
T
85
C 100 m W
a
SS
0.3 to V
55 to 125
+ 0.3 V
DD
Recommended Operating Conditions
Parameter Symbol Condition
Supply voltage range V
Operating temperature T
Operating current
Coil inductance L
1. Max value is as same as Absolute Maximum Ratings.
1
DD2
OPR
I
DD2
LDR
Including coil current, V
Including coil current, V
Including coil current, V
Including coil current, V
f
= 64 kHz – 0.47 – mH
LDR
DD
DD
DD
DD
3.0V, T
5.0V, T
3.0V, T
5.0V, T
Rating
min typ max
1.6 3.0 5.5 V
40 – 85
70
C – – 100 mA
a
70
C– – 60 mA
a
85
C– – 70 mA
a
85
C– – 42 mA
a
Unit
C
preliminary
NIPPON PRECISION CIRCUITS—3
Page 4
DC Characteristics
V
= 3.0 V, T
DD
= 25 ° C unless otherwise noted.
a
SM8144B
Ω
Ω
Ω
Ω
µ
µ
µ
Parameter Symbol Condition
Supply voltage V
CHV output voltage V
OUT1, OUT2 HIGH-level output voltage V
OUT1, OUT2 LOW-level output voltage V
LDR output resistance R
OSC oscillator frequency f
OSC oscillator frequency range f
OUT1, OUT2 output frequency f
OUT1, OUT2 output frequency range f
LDR inductance driver frequency f
LDR inductance driver frequency range f
ENA HIGH-level input voltage V
ENA LOW-level input voltage V
ENA input current I
ENA rise time
Operating current I
Stand-by current I
1.
1
DD
CHV
OUTH
OUTL
LDR
OSC1
OSC2
OUT1
OUT2
LDR1
LDR2
ENAH
ENAL
ENAH
t
ENA
DD1
STB
Rating
min typ m ax
1.6 3.0 5.5 V
0.5 – 100 V
– – 100 V
– – 0.5 V
I
= 50 mA – 3.5 5.25
LDR
R
= 180 k
OSC
R
= 180 k
OSC
R
= 180 k
OSC
ENA = HIGH, V
ENA = LOW, V
V
= V
ENAH
Excluding coil current – – 1 .0 mA
ENA = LOW – – 1.0
= 1.6 to 5.5V V
DD
= 1.6 to 5.5V V
DD
= 3.0V 2.0 4.0 6.0
DD
205 256 307
32 – 1536
200 250 300
31 – 1500
51 64 77
8 – 384
– 0.5 – V
DD
– 0.3 – V
SS
– – 100
DD
SS
+ 0.3
+ 0.5
Unit
kHz
Hz
kHz
V
A
s
A
ENA
VSS
VDD
VDD − 0.5
SS + 0.5
V
tENA
preliminary
NIPPON PRECISION CIRCUITS—4
Page 5
TYPICAL APPLICATIONS
■
EL sheet size: 20 to 30cm
2
, Current consumption: 20mA
0.1µF
100V
SM8144B
CHV
OUT1
EL sheet
■
EL sheet size: 30 to 50cm
0.01µF
2
, Current consumption: 40mA
0.01µF
470µH
3.0V
3.0V
180kΩ
Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N471K04M00
0.1µF
100V
220µH
180kΩ
Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N221K04M00
LDR
VSS
OSC
CHV
LDR
VSS
OSC
OUT2
VDD
ENA
OUT1
OUT2
VDD
ENA
EL sheet
■
EL sheet size: 50 to 100cm
preliminary
Note: Do not operate the SM8144B with the EL sheet NOT connected (no load to OUT1/OUT2) since the IC will be damaged.
2
, Current consumption: 80mA
0.1µF
100V
0.01µF
220µH
3.0V
360kΩ
Diode: TOSHIBA 1SS250
Coil: TOKO D73LC (817CE221M)
CHV
LDR
VSS
OSC
OUT1
OUT2
VDD
ENA
EL sheet
NIPPON PRECISION CIRCUITS—5
Page 6
SM8144B
preliminary
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to
improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for
the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits
are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision
Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification.
The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or
malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter,
including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or
indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies.
NIPPON PRECISION CIRCUITS INC.
4-3, Fukuzumi 2-chome
Koto-ku, To kyo 135-8430, Japan
NIPPON PRECISION CIRCUITS INC.
Telephone: 03-3642-6661
Facsimile: 03-3642-6698
NP0006AE 2000.05
NIPPON PRECISION CIRCUITS—6
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