Data Sheet u Electroluminescent Lamp Driver IC Description Features The u1201 is a high voltage output DC-AC converter that can operate from a 2.2V - 5.0V power supply. The u1201 is capable of supplying up to 220Vpp signals, making it ideal for driving small electroluminescent lamps. One external inductor is required to generate the high voltage charge. The device features 15A (max) standby current, for use in low power 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 u1201 is offered in 8 pin TSSOIC package. q q q q q q q Battery operation 2.2V - 5.0V 15A Maximum Standby Current High Voltage Output up to 220Vpp Dual oscillator operation Enable control Temperature range -25C ... +85C Package TSSOP8 u1201ES Applications q q q q q q q q q q Watches Pagers Handheld Instruments Mobile Cellular Phones Electronic Organizers Personal Biological Monitors Handheld Games LCD modules PDAs Portable Instrumentation Typical Application 3V-Battery 4.7mH / 15Ohm ESR Cap 4 COIL VDD 1 u1201 On/Off 5 6 1.5nF 7 22pF 0V July 2001 8 EN OUT1 2 EL-Lamp 4sq.inch CL CC OUT2 3 GND alpha microelectronics gmbh u1201 Functional Block Diagram VDD / VBattery u1201 VDD 4 VDD Enable 5 EN COIL COIL 1 OUT1 2 & EL-Lamp & 6 CC Oscillator coil H-Bridge Div 2 & OUT2 Coil Cap 7 CL 8 GND Lamp Cap Oscillator lamp 3 Div 2 General description The u1201 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 A 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 u1201 is offered in 8-pin narrow TSSOIC package. Block Description The u1201 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). u1201 alpha microelectronics gmbh July 2001 Page 2 of 6 Pin Configuration TSSOP 8 COIL 1 8 GND OUT1 2 7 CC OUT2 3 6 CL VDD 4 5 EN 1201ES 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 1 VDD Supply voltage 2 VIN Input voltage 3 IIN Input current 4 VDS Max Unit 7.0 V VDD + 0.5 V 60 mA Lamp output voltage 220 VPP 2) 390 mW 150 C 150 C -0.5 5 PTOT Power dissipation 6 Tstg Storage temperature 7 TJ Junction temperature Note: Min -65 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 = 70C for u1201ES (TSSOP8) July 2001 Page 3 of 6 alpha microelectronics gmbh u1201 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 = -25C ... +85C, 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 1 IS = IDD + ICOIL Supply current 2 ISD = IDD + ICOIL Shutdown current 3 VEN H Input voltage High - EN 4 VEN L Input voltage Low - EN 5 IEN Input current - EN Min Typ Max Unit VDD = VEN = 3.0V VCOIL = 3.0V Ta = 25C 15 25 mA VDD = 5.0V VEN = 0V, Ta = 25C 5 15 A VDD-0.25 VDD VDD+0.25 V -0.25 0 0.25 V 25 A VEN = VDD Ta = 25C AC Characteristics Ta = 25C ... +85C, VDD = 2.2 ... 5.0V, VCOIL = VDD ... 5.0V, CEL-lamp = 22nF, Coil = 4.7mH/15Ohm, CCC = 22pF, CCL = 1.5nF unless otherwise specified # 1 Symbol fCOIL Parameter Coil frequency Conditions VDD = 3.0V , Ta = 25C Min Typ Max Unit 15 20 25 kHz 35 kHz 10 2 DCC Coil duty cycle 3 Ipeak coil Peack current coil Guaranteed by design 4 fEL-lamp EL-lamp frequency VDD = 3.0V , Ta = 25C 75 150 200 100 5 Vpeak lamp u1201 EL-lamp voltage, peak to peak % 60 mA 250 Hz 450 Hz VDD = 2.2V , Ta = 25C 50 70 VPP VDD = 3.0V , Ta = 25C 80 110 VPP VDD = 5.0V , Ta = 25C 100 130 VPP VDD = 3.0V 60 alpha microelectronics gmbh VPP July 2001 Page 4 of 6 Package: 8-pin Plastic TSSOP Outline dimensions: Plastic package TSSOP 8 A B C DIM Min Typ Max A 2.90 3.00 3.10 M G 8 5 D -- -- 1.20 0.05 0.10 0.15 D 4.30 4.40 4.50 E 6.25 6.40 6.55 G -- -- -- E H Pin 1 index 4 H B C 0.65 BSC K 0.19 0.25 0.30 M 0 -- 8 K Application hint: Board Layout Considerations The u1201 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. July 2001 Page 5 of 6 alpha microelectronics gmbh u1201 Note It is not given warranty that the declared circuits, devices, facilities; components, assembly groups or treatments included herein are free from legal claims of third parties. The declared data are serving only to description of product. They are not guarantee properties as defined by law. The examples are given without obligation and cannot given rise to any liability. Reprinting this data sheet - or parts of it - is only allowed with a license of the publisher. alpha microelectronics gmbh reserves the right to make changes on this specification without notice at any time. alpha microelectronics gmbh Im Technologiepark 1 15236 Frankfurt (Oder) Germany Tel Fax Internet Email ++49-335-557 1750 ++49-335-557 1759 www.alpha-microelectronics.de zinke@alpha-microelectronics.de DIN EN ISO 9001 Zertifikat 15 100 0783 1201_DS-Ha u1201 alpha microelectronics gmbh July 2001 Page 6 of 6