SP4405

Power Supply, V_BATTERY....................................................................7.0V
Input Voltages, ELEN (pin 1)......................................-0.5V to (V_DD+0.5V)
Lamp Outputs...............................................................................200V_PP
Operating Temperature...................................................-40°C to +85°C
Storage Temperature....................................................-65°C to +150°C
Power Dissipation Per Package
8-pin NSOIC (derate 6.14mW/oC above +70oC)...........................500mW
8-pin mSOIC (derate 4.85mW/oC above +70oC)..........................390mW

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 160V_PP (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 50nA (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 mSOIC packages.