July 2001 alpha mi croelectronics gm bh ú1201
Description
The ú1201 is a high voltage output DC-AC con-
verter that can operate from a 2.2V - 5.0V power
supply.
The ú1201 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 ú1201 is offered in 8 pin TSSOIC package.
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 TSSOP8 ú1201ES
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
2
6
5
4
ú1201
OUT1
COIL 1
On/Off
OUT2 3
7 CC
3V-Batter
y
EL-La m p
4sq.inch
8 GND
1.5nF 22pF
0V
ESR
Cap
Electroluminescent Lamp Driver IC
ú
Data Sheet
ú1201 alpha microelectroni cs gm bh July 2001
Page 2 of 6
Functional Block Diagram
ú1201
VDD
5
4
6 CC
GND 8
EN Enable
3
2
OUT2
OUT1
1 COIL
COIL
Oscillator
coil Div 2
VDD
VDD / VBatter
y
EL-Lamp
&
&
&
CL
Oscillator
lamp
7
Lamp
Cap
Coil
Cap
H-Bridge
Div 2
General description
The ú1201 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 ú1201 is offered in 8-pin narrow TSSOIC package.
Block Description
The ú1201 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 to 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 CL and GND allows the user to vary the lamp output frequency
from approximately 75Hz (4.7nF) to 1kHz (270pF).
Likewise, an external capacitor connected between 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 ú1201
Pin Configuration
TSSOP 8
1
2
3
4
8
7
6
5
1201ES
CC
GND COIL
OUT1
CL
EN VDD
OUT2
Pin Description
PIN # NAME FUNCTION
1 COIL Coil input. Connect inductor from this pin to positive power supply.
2 OUT1 Lamp driver output 1. Connect to EL lamp.
3 OUT2 Lamp driver output 2. Connect to EL lamp.
4 VDD Positive power supply
5 EN Input to enable driver operation. Internal pulled down.
EN = High activates driver.
6 CL Oscillator input. Connect capacitor to GND to set lamp frequency.
7 CC Oscillator input. Connect capacitor to GND to set coil switching frequency.
8 GND Power supply common
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) 390 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 4.9mW/K above Ta = 70°C for ú1201ES (TSSOP8)
ú1201 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 ú1201
Package: 8-pin Plastic TSSOP
B
C
D
K H
G
E
Pin 1 index
58
4
M
DIM Min Typ Max
A
B
C
D
E
G
H
K
M
2.90
--
0.05
4.30
6.25
--
0.19
0°
3.00
--
0.10
4.40
6.40
--
0.25
--
3.10
1.20
0.15
4.50
6.55
--
0.65 BSC
0.30
8°
Outline dimensions: Plastic package TSSOP 8
A
Application hint:
Board Layout Considerations
The ú1201 IC incorporates two independent asynchronous oscillators. One of which supplies the signal
for switching of the coil transistor which generates the coil charge pulses.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 cross talk 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 the
VDD (pin 4) and GND (pin 8). 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.
ú1201 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
1201_DS-Ha
DIN EN ISO 9001
Zerti f ikat 15 10 0 078 3
