Details, datasheet, quote on part number: SP4491EU
PartSP4491EU
Category
TitleLEDs/Segment Display Drivers
DescriptionTwo Panel Electroluminscent Lamp Driver
CompanySipex Corporation
DatasheetDownload SP4491EU datasheet
Quote
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Features, Applications

s Single IC Drives 2 EL Lamps For Backlighting: Cell Phone Keypad & LCD Multi-Color EL Lamps Multi-Segment EL Lamps s Control Over Lamp-A & Lamp-B For Independent Or Concurrent Operation to +6.0V Battery Operation s Single Coil Used To Generate High Voltage AC Outputs s Low Power Standby Mode Draws 100nA Typical Current s A Single Resistor Controls the Internal Oscillator s DC-AC Inverter Produces 220VPP s Space-Saving 10MSOP Package APPLICATIONS s Cellular Phones s PDA's s Handheld GPS Units s Security Systems s POS Terminals

DESCRIPTION The SP4491 electroluminescent lamp driver provides designers of cell phones PDA's and other handheld, portable electronic devices with an integrated solution for driving two EL lamps independently or concurrently. The SP4491 reduces system cost, component count and board space requirements over a discrete 2-EL driver approach. The EL lamps operate in opposite phase so the SP4491 can be easily implemented in applications driving multicolor or multi-segment EL lamps. The SP4491 operates from to +6.0V battery source. The device features a low power standby mode which draws less than 1mA. The frequency of the internal oscillator is set using a single external resistor. A single external inductor is required to generate the high voltage AC outputs to drive the EL lamps. All input pins are ESD protected with internal diodes to VDD and VSS.

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Power Supply, VDD.................................................7.0V Input Voltages, to (VDD+0.3V) Lamp Outputs...................................................220VP-P Operating to +85C Storage to +150C Power Dissipation Per Package 10-pin MSOP (derate 8.84mW/C above +70C)....................720mW

Storage in a low humidity environment is preferred. Large high density plastic packages are moisture sensitive and should be stored in Dry Vapor Barrier Bags. Prior to usage, the parts should remain bagged and stored below 40C and 60%RH. If the parts are removed from the bag, they should be used within 48 hours or stored in an environment at or below 20%RH. If the above conditions cannot be followed, the parts should be baked for four hours 125C in order remove moisture prior to soldering. Sipex ships product in Dry Vapor Barrier Bags with a humidity indicator card and desiccant pack. The humidity indicator should be below 30%RH. The information furnished by Sipex has been carefully reviewed for accuracy and reliability. Its application or use, however, is solely the responsibility of the user. No responsibility for the use of this information become part of the terms and conditions of any subsequent sales agreement with Sipex. Specifications are subject to change without no responsibility for any infringement of patents or other rights of third parties which may result from its use. No license or other proprietary rights are granted by implication or otherwise under any patent or patent rights of Sipex Corporation.

SPECIFICATIONS

PARAMETER Supply Voltage, VDD Supply Current, IDD Coil Voltage, VCOIL ELEN1/ELEN2 LOW Threshold ELEN1/ELEN2 HIGH Threshold VDD 0.25 MIN. 2.2 10 TYP.

VDD = +3.0V, LCOIL = 2.2mH, ROSC 560k, El Lamp Load = 4.7nF; CINT = 1000pF and TAMB = 25C unless otherwise noted.

Shutdown Current, ISD=ICOIL+IDD INDUCTOR DRIVE Coil Frequency, fCOIL Coil Duty Cycle Coil Current, ICOIL Peak Coil Current, IPK-COIL EL LAMP OUTPUT EL Lamp Frequency, fLAMP Peak to Peak Output Voltage, VPK-PK

PIN ASSIGNMENTS PIN # 1 PIN NAME ELEN1 DESCRIPTION Electroluminescent Lamp Enable Control Line 1. This is a control line to enable a single or dual EL lamp output. Refer to Table 1 for the control logic. Positive Battery Power Supply. Connect such that +2.636V < VDD < +3.15V. Oscillator Resistor. Connecting a resistor between this input pin andVDD sets the frequency of the internal clock. Electroluminescent Lamp Enable Control Line 2. This a control line to enable a single or dual EL lamp output. Refer to Table 1 for the control logic. Power Supply Common. Connect to the lowest circuit potential, typically ground. Coil. The inductor for the boost converter is connected from VBATT to this input pin. Integrator Capacitor. An integrating capacitor (1800pF typically) connected from this pin to ground filters out any coil switching spikes or ripple present in the output waveform to the EL lamps. Connecting a fast recovery diode from COIL to CAP increases the light output of the EL lamp. Electroluminescent Common. This is a high voltage lamp driver output pin common to both EL lamps. Electroluminescent Lamp Output 2. This is a high voltage lamp driver output pin connect to the second EL lamp. Electroluminescent Lamp Output 1. This is a high voltage lamp driver output pin to connect to the first EL lamp.

SP4491 Two Panel Electroluminescent Lamp Driver Copyright 2002 Sipex Corporation

 

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