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
cm
2
in size. It is a high-efficiency driver that features revised 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
s
s
s
PINOUT
(Top view)
ina
CHV
1
2
3
4
LDR
VSS
s
s
s
s
s
Dedicated EL driver
1.6 to 5.5 V supply voltage
100mA maximum operating current
(V
DD
= 3.0V, Ta
≤
70°C)
3.5Ω 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
OSC
*: Adjustable with external resistance.
s
s
s
Hand held PC, Palm size PC
Mobile IT equipment
White EL
lim
P ackag e
8-pin V S O P
APPLICATIONS
PACKAGE DIMENSIONS
(Unit : mm)
0 to 10
ORDERING INFORMATION
D e vice
SM8144BV
4.4
± 0.2
6.4
±
0.3
0.575 typ
3.1
±
0.3
1.15
± 0.05
0.15
−0
.05
+0
.1
pre
0.10
0.22
± 0.1
0.1
± 0.05
0.65
0.12
M
NIPPON PRECISION CIRCUITS—1
0.5
± 0.2
ry
8
7
6
5
OUT1
OUT2
VDD
ENA
8144BV
SM8144B
BLOCK DIAGRAM
EL sheet
<
80cm
2
VDD
LDR
CHV
Boosting Block
VSS
PIN DESCRIPTION
Pin nu m b e r
1
2
3
4
Name
CHV
LDR
VSS
lim
I/O
I
High-voltage DC input
O
–
I
Booster coil driver output
Ground
I
–
Supply
O
O
Output 2
Output 1
When ENA is logical "H", SM8144B is active.
pre
OSC
ENA
5
6
7
8
VDD
OUT2
OUT1
Coil and EL driver oscillator (oscillator frequency determined by external resistor)
E n a ble input (built-in pull-down resistor)
ina
Dividing Circuit
1/4
Dividing Circuit
1/1024
Oscillator for
Boosting and EL driving
OSC
ENA
Oscillation Block
R
OSC
ENA from microcontroller
ry
OUT1
OUT2
Switching Circuit
Function
NIPPON PRECISION CIRCUITS—2
SM8144B
SPECIFICATIONS
Absolute Maximum Ratings
P arameter
Supply voltage range
Input voltage range
Symbol
V
DD
V
IN
V
CHV
Output voltage
V
LDR
V
OUT1/2
Pow er dissipation
Storage temperature range
P
D
T
STG
All Input pins
CHV pin
LDR pin
Condition
Rating
−
0.3 to 7.0
V
S S
−
0.3 to V
D D
+ 0.3
0.5 to 120
Unit
V
V
V
V
V
OUT1, OUT2 pin
T
a
≤
70
°C
T
a
≤
85
°C
Recommended Operating Conditions
P arameter
Supply voltage range
Operating temperature
Symbol
V
DD2
T
O P R
ina
ry
0.5 to 120
0.5 to 120
140
100
−
55 to 125
Rating
typ
3.0
–
Condition
min
1.6
max
5.5
85
−
40
–
–
–
–
–
–
–
–
–
0.47
100
60
70
42
–
mW
mW
°C
Unit
V
°C
Including coil current, V
D D
=
3.0V, T
a
≤
70
°C
Operating current
1
mA
lim
I
D D 2
L
LDR
f
L D R
= 64 kHz
Including coil current, V
D D
=
5.0V, T
a
≤
70
°C
Including coil current, V
D D
=
3.0V, T
a
≤
85
°C
Including coil current, V
D D
=
5.0V, T
a
≤
85
°C
mA
mA
mA
Coil inductance
mH
1. Max value is as same as Absolute Maximum Ratings.
pre
NIPPON PRECISION CIRCUITS—3
SM8144B
DC Characteristics
V
DD
= 3.0 V, T
a
= 25
°C
unless otherwise noted.
Rating
P arameter
Supply voltage
CHV output voltage
OUT1, OUT2 HIGH-level output voltage
O U T 1 , O U T 2 L OW -level output voltage
LDR output resistance
OSC oscillator frequency
OSC oscillator frequency range
OUT1, OUT2 output frequency
OUT1, OUT2 output frequency range
LDR inductance driver frequency
LDR inductance driver frequency range
ENA HIGH-level input voltage
E N A L OW -level input voltage
ENA input current
ENA r ise time
1
Operating current
Stand-by current
1.
Symbol
V
DD
V
CHV
V
OUTH
V
OUTL
R
LDR
f
O S C 1
f
O S C 2
f
O U T 1
f
O U T 2
f
L D R 1
f
L D R 2
V
ENAH
V
ENAL
I
E N A H
t
E N A
I
D D 1
I
S T B
I
L D R
= 50 mA
R
O S C
= 180 kΩ
Condition
min
1.6
0.5
–
–
typ
3.0
–
max
5.5
100
V
V
V
V
Unit
ina
R
O S C
= 180 kΩ
200
31
51
8
250
–
R
O S C
= 180 kΩ
64
–
ENA = HIGH, V
D D
= 1.6 to 5.5V
V
D D
– 0.5
V
S S
– 0.3
2.0
–
–
E N A = L OW , V
D D
= 1.6 to 5.5V
V
E N A H
= V
D D
= 3.0V
–
4.0
–
Excluding coil current
E N A = L OW
–
–
–
–
lim
V
DD
ENA
V
SS
V
DD
−
0.5
V
SS
+ 0.5
t
ENA
pre
NIPPON PRECISION CIRCUITS—4
ry
–
–
100
0.5
–
3.5
5.25
307
205
32
256
–
1536
300
1500
77
384
V
D D
+ 0.3
V
S S
+ 0.5
6.0
100
1.0
1.0
Ω
kHz
Hz
kHz
V
µA
µs
mA
µA
SM8144B
TYPICAL APPLICATIONS
s
EL sheet size: 20 to 30cm
2
, Current consumption: 20mA
CHV
LDR
0.01µF
470µH
VSS
OSC
s
EL sheet size: 30 to 50cm
2
, Current consumption: 40mA
0.1µF
100V
lim
LDR
0.01µF
3.0V
s
EL sheet size: 50 to 100cm
2
, Current consumption: 80mA
pre
0.01µF
3.0V
0.1µF
100V
Note: Do not operate the S M 8 1 4 4 B with the EL sheet NOT connected (no load to OUT1/OUT2) since the IC will be damaged.
ina
Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N471K04M00
CHV
OUT1
3.0V
180kΩ
220µH
VSS
OSC
180kΩ
Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N221K04M00
CHV
LDR
220µH
VSS
VDD
OSC
360kΩ
Diode: TOSHIBA 1SS250
Coil: TOKO D73LC (817CE221M)
ry
OUT1
OUT2
VDD
ENA
0.1µF
100V
EL sheet
EL sheet
OUT2
VDD
ENA
OUT1
EL sheet
OUT2
ENA
NIPPON PRECISION CIRCUITS—5
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