July 2001 alpha mi croelectronics gm bh ú1200
Description
The ú1200 is a high voltage output DC-AC con-
verter that can operate from a 2.2V - 5.0V power
supply.
The ú1200 is capable of supplying up to 220Vpp
signals, making it ideal for driving small electrolu-
mines cent lam ps. One external inductor is required
to generate the high voltage charge.
The device features 15µA (max) standby current,
for use in low power portable products. An induc tor
is used to generate the high voltage, and two ex-
ternal capacitors are needed to select the inductor
and the lamp oscillator frequencies.
The ú1200 is offered in an 8 pin narrow SOIC
package or also in die form.
Features
q Battery operation 2.2V - 5.0V
q 15µA Maximum Standby Current
q High Voltage Output up to 220Vpp
q Dual oscillator operation
q Enable control
q Temperature range -25°C ... +85°C
q Package SOP8 ú1200ET
Die ú1200EX
Applications
q Watches
q Pagers
q Handheld Instruments
q Mobile Cellular Phones
q Electronic Organizers
q Personal Biological Monitors
q Handheld Games
q LCD modules
q PDAs
q Portable Instrumentation
Typical Application
4.7mH /
15Ohm
CL
EN
VDD
4
8
7
6
ú1200
OUT1
COIL 3
On/Off
OUT2 5
1 CC
3V-Batter
y
EL-La m p
4sq.inch
2 GND
1.5nF 22pF
0V
ESR
Cap
Electroluminescent Lamp Driver IC
ú
Data Sheet
ú1200 alpha microelectroni cs gm bh July 2001
Page 2 of 6
Functional Block Diagram
ú1200
VDD
7
6
1 CC
GND 2
EN Enable
5
4
OUT2
OUT1
3 COIL
COIL
Oscillator
coil Div 2
VDD
VDD / VBatter
y
EL-Lamp
&
&
&
CL
Oscillator
lamp
8
Lamp
Cap
Coil
Cap
H-Bridge
Div 2
General description
The ú1200 is a high voltage output DC-AC converter that can operate from a 2.2V - 5.0V power supply.
The IC is capable of supplying up to 220Vpp signals, making it ideal for driving small electro luminescent
lamps. The device features 15 µA standby current, for use also in portable products.
An inductor is used to generate the high voltage, and two external capacitors are needed to select the
inductor and the lamp oscillator frequencies.
The ú1200 is offered in an 8-pin narrow SOIC package or die form.
Block Description
The ú1200 are made up of three basic circuit elements, two oscillators, a coil, and a switched H-bridge
network. The oscillators set the coil and lamp frequencies independently. This allows for the selective
setting of the coil / lamp frequency ratio. The coil frequency can be selected for maximum energy transfer
per cycle for a given coil value. The coil oscillator is designed to operate at 75% duty cycle and the lamp
oscillator is designed for 50% duty cycle, for minimum DC offset across the EL lamp.
An external capacitor connected between pin CL and GND allows the user to vary the lamp output fre-
quency from approximately 75Hz (4.7nF) to 1kHz (270pF). Likewise, an external capacitor connected
between pin CC and GND allows the user to vary the coil output frequency from approximately
4kHz (220pF) to 30kHz (10pF).
July 2001
Page 3 of 6 alpha mi croelectronics gm bh ú1200
Pin / Pad Configuration
SOP 8 Die
Pin Description / Pad Coordinates
PIN / PAD# NAME FUNCTION PAD-X * PAD-Y *
1 CC Oscillator input. Connect capacitor to GND to set
coil switching frequency. -703.0 105.0
2 GND Power supply common 380.0 -467.0
3 COIL Coil input. Connect inductor from COIL to positive
power supply. 712.0 -448.0
4 OUT1 Lamp driver output 1. Connect to EL lamp. 712.0 -186.0
5 OUT2 Lamp driver output 2. Connect to EL lamp. 712.0 149.0
6 VDD Positive power supply 712.0 367.0
7 EN Input to enable driver operation. Internal pulled down.
EN = High activates driver. -712.0 424.0
8 CL Oscillator input. Connect capacitor to GND to set
lamp frequency. -712.0 136.0
* Centre of pad; related to die centre (0,0); Dimensions are in microns.
ESD protection according to MIL-STD. 883E (Method 3015.7, HBM, minimum 1.5kV) for all pads
Absolute Maximum Ratings 1)
# Symbol Parameter Min Max Unit
1 VDD Supply voltage 7.0 V
2 VIN Input voltage -0.5 VDD + 0.5 V
3 IIN Input current 60 mA
4 VDS Lamp output voltage 220 VPP
5 PTOT Power dissipation
2) 500 mW
6 Tstg Storage temperature -65 150 °C
7 TJ Junction temperature 150 °C
Note: 1): These are stress ratings only and functional operation of the device at these or any other conditions
beyond those indicated in the operation sections of the specification below is not implied.
2): Derate linearly with 6.2mW/K above Ta = 70°C for ú1200ET (SOP8)
CC
EN VDD
CL
COIL
OUT1
OUT2
(0,0)
X
Y
GND
1200EX
600
µ
m
1800 x 1300
µ
m2
125 x 125
µ
m2 Pad size:
Gross di e size:
Die thi ckness:
COIL
OUT1
1
2
3
4
8
7
6
5
1200ET
CC
GND
CL
EN
VDD
OUT2
ú1200 alpha microelectroni cs gm bh July 2001
Page 4 of 6
Electrical Characteristics
Operational Range
# Symbol Parameter Min Max Unit
1 VDD Supply voltage 2.2 5.0 V
2 VCOIL Supply voltage connected to inductor VDD 5.0 V
3
CEL-lamp EL-lamp capacitance 4 22 nF
4 fEL-lamp EL-lamp frequency 75 1000 Hz
5 L Coil inductance 1 10 mH
6 fCOIL Coil frequency 4 40 kHz
7 Ta Ambient temperature -25 85 °C
DC Characteristics
Ta = -25°C … +85°C, VDD = 2.2 … 5.0V, VCOIL = VDD … 5.0V,
CEL-lamp = 22nF, Coil = 4.7mH/15Ohm, CCC = 22pF, CCL = 1.5nF unless otherwise specified
# Symbol Parameter Conditions Min Typ Max Unit
1
IS =
IDD + ICOIL Supply current VDD = VEN = 3.0V
VCOIL = 3.0V
Ta = 25°C
15 25 mA
2
ISD =
IDD + ICOIL Shutdown current VDD = 5.0V
VEN = 0V,
Ta = 25°C
5 15 µA
3
VEN H Input voltage High - EN VDD-0.25 VDD V
DD+0.25 V
4
VEN L Input voltage Low - EN -0.25 0 0.25 V
5 IEN Input current - EN VEN = VDD
Ta = 25°C 25 µA
AC Characteristics
Ta = 25°C … +85°C, VDD = 2.2 … 5.0V, VCOIL = VDD … 5.0V,
CEL-lamp = 22nF, Coil = 4.7mH/15Ohm, CCC = 22pF, CCL = 1.5nF unless otherwise specified
# Symbol Parameter Conditions Min Typ Max Unit
VDD = 3.0V , Ta = 25°C 15 20 25 kHz
1
fCOIL Coil frequency
10 35 kHz
2
DCC Coil duty cycle 75 %
3 Ipeak coil Peack current coil Guaranteed by design 60 mA
VDD = 3.0V , Ta = 25°C 150 200 250 Hz
4
fEL-lamp EL-lamp frequency
100 450 Hz
VDD = 2.2V , Ta = 25°C 50 70 VPP
VDD = 3.0V , Ta = 25°C 80 110 VPP
VDD = 5.0V , Ta = 25°C 100 130 VPP
5 Vpeak lamp EL-lamp voltage,
peak to peak
VDD = 3.0V 60
VPP
July 2001
Page 5 of 6 alpha mi croelectronics gm bh ú1200
Package 8-pin Plastic SOP
Outline dimensions: Plastic package SOP 8
B
C
D
K H G
E
Pin 1 index
5 8
4
DIM Min Typ Max
A
B
C
D
E
G
H
K
M
4.9
--
0.1
3.9
6.0
--
0.35
0°
5.0
--
0.2
4.0
6.2
--
0.42
--
5.1
2.0
0.3
4.2
6.4
--
1.27 BSC
0.49
10°
M
A
Application hint:
Board Layout Considerations
The ú1200 IC incorporates two independent asynchronous oscillators, one of which supplies the signal
for switching of the coil transistor which generates the coil charge pulses and the other supplies the clock
signal to switch the high voltage H-bridge output circuit. It is necessary to keep all high voltage signals
away from these oscillator clock signals as much as possible as crosstalk between the two signals can
cause distortion in the EL drive signal which can result in either low light output or blinking of the EL lamp.
It is always recommended that a low ESR decoupling capacitor (100nF or more) be used between VDD
and GND tight to the circuit. The GND pin should in turn be connected to the system ground plane. If it is
connected via a circuit trace, this trace should be as short and as wide as possible.
ú1200 alpha microelectroni cs gm bh July 2001
Page 6 of 6
Note
It is not given warranty that the declared circ uits, devices , facilities ; components, assembly groups or t reat ments included herein
are free from legal clai ms of third parties.
The declared data are serving only to des c ri ption of product. They are not guarantee properties as defined by law. The examples
are given without obligation and cannot given ris e t o any liabilit y.
Reprinting t hi s data sheet - or part s of it - is only allowed with a licens e of the publis her.
alpha mi croelectronics gm bh reserves the right to m ak e changes on this specificati on without notice at any time.
alpha microelectronics gmbh
Im Technologiepark 1 Tel ++49-335-557 1750
15236 Frankfurt (Oder) Fax ++49-335-557 1759
Germany Internet www.alpha-microelectronics.de
Email zinke@alpha-microelectronics.de
1200_DS-Hc
DIN EN ISO 9001
Zerti f ikat 15 10 0 078 3
