SP4405 Datasheet | Sipex

DESCRIPTION The SP4405 is a high voltage output DC-AC inverter specifically designed to drive electroluminescent lamps to backlight liquid crystal displays, keypads, and backlit readouts used in battery operated portable equipment. The SP4405 will operate from a +2.2V to +4.5V battery source. The device features an internal feedback loop that regulates the lamp voltage output to 160VPP (typical) with varying supply voltages to maintain constant EL lamp brightness over the life of the battery. The device also has a low power shutdown mode which draws less than 50n A (typical), ideal for low power portable products. One external inductor is required to generate the high voltage AC output. One external resistor is used to set the internal oscillator frequency. The SP4405 is ideal for portable applications such as pagers, cellular phones, PDAs, and other portable applications using LCDs in dim or low light environments. The SP4405 is offered in 8-pin SOIC and 8-pin µSOIC packages. VBATTERY ELEN 1 VSS 2 COIL 3 EL1 4 SP4405 8 ROSC 7 CINT 6 5 VDD EL2 C1 0.1µF ELEN L1 470µH VDD ROSC 450kΩ 6 3 COIL - D1 1N4148 ROSC CINT C2 1n F 2 VSS 4 EL1 5 EL2 CINT 0.1µF EL Lamp - optional device SP4405DS/18 SP4405 Low Voltage Electroluminescent Lamp Driver © Copyright 2000 Sipex Corporation ABSOLUTE MAXIMUM RATINGS 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, VBATTERY 7.0V Input Voltages, ELEN (pin 1) -0.5V to (VDD+0.5V) Lamp Outputs 200VPP Operating Temperature -40˚C to...