Supertex inc. HV839 High Voltage Dual EL Lamp Driver IC Features General Description The Supertex HV839 is a high voltage driver designed for driving Independent input control for lamp selection 2 two EL lamps with a combined area of 3.5in . The input supply Split supply capability voltage range is from 2.0 to 5.8V. The device is designed to Patented output timing reduce the amount of audible noise emitted by the lamp. This One miniature inductor to power both lamps device uses a single inductor and minimum number of passive Low shutdown current components to drive two EL lamps. The nominal regulated Wide input voltage range 2.0 to 5.8V output voltage of 90V is applied to the EL lamps. The two EL Output voltage regulation lamps can be turned ON and OFF by the two logic input control No SCR output pins, C1 and C2. The device is disabled when both C1 and C2 Available in small packages (10-lead MSOP and (pins 1 and 4) are at logic low. 10-lead DFN) The HV839 has an internal oscillator, a switching MOSFET, and Applications two high voltage EL lamp drivers. An external resistor connected between the RSW-Osc pin and the voltage supply pin VDD sets Mobile cellular phones, dual display the frequency for the switching MOSFET. The EL lamp driver Keypad and LCD backlighting frequency is set by dividing the MOSFET switching frequency Portable instrumentation by 128. An external inductor is connected between the LX and Dual segment lamps the VDD pins. Depending on the EL lamp size, a 1.0 to 10.0nF, Hand held wireless communication devices 100V capacitor is connected between CS and GROUND. The two EL lamps are connected between EL1 to COM and EL2 to COM. The switching MOSFET charges the external inductor and discharges it into the capacitor at CS. The voltage at CS increases. Once the voltage at CS reaches a nominal value of 90V, the switching MOSFET is turned OFF to conserve power. The outputs EL1 to COM and EL2 to COM are configured as H bridges and switch in opposite states to achieve 180V across the EL lamp. Typical Application Circuit V = ON EN 0 = OFF 1 V = ON 1 EL Lamp 1 EN 10 EL1 C1 0 = OFF 2 9 1 VDD EL2 EL Lamp 2 + 3 8 COM RSW-Osc V C DD DD - RSW-Osc 4 7 C2 CS D 6 5 GND LX + V C HV839 IN S C L IN X - 1. The bigger sized lamp should be tied to EL1 and the smaller sized lamp to EL2 terminals (pins 10 and 9 respectively) Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com HV839 Pin Configurations Ordering Information Package Options C1 1 10 EL1 10-Lead DFN 10-Lead MSOP Device 3.00x3.00mm body 3.00x3.00mm body VDD 2 9 EL2 1.0mm height (max) 1.10mm height (max) 0.50mm pitch 0.50mm pitch RSW-Osc COM 3 8 HV839 HV839K6-G HV839MG-G C2 4 CS 7 -G indicates package is RoHS compliant (Green) 5 6 GND LX 10-Lead DFN (K6) C1 1 EL1 10 VDD 2 9 EL2 RSW-Osc 3 8 COM Absolute Maximum Ratings 4 C2 7 CS Parameter Value GND 5 6 LX V , supply voltage -0.5V to +7.5V DD 10-Lead MSOP (MG) V , output voltage -0.5V to +120V CS Storage temperature -65C to +150C Product Marking Operating temperature -40C to +85C Y = Last Digit of Year Sealed H839 Absolute Maximum Ratings are those values beyond which damage to the device may W = Code for Week Sealed occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect device reliability. All voltages are YWLL L = Lot Number referenced to device ground. = Green Packaging Package may or may not include the following marks: Si or Thermal Resistance 10-Lead DFN (K6) Package ja O 10-Lead DFN 60 C/W Top Marking O 10-Lead MSOP 400 C/W H839 L = Lot Number Note: LLLL Mounted on FR4 board, (25mm x 25mm x 1.57mm) YY = Year Sealed Bottom Marking WW = Week Sealed = Green Packaging YYWW Package may or may not include the following marks: Si or 10-Lead MSOP (MG) Recommended Operating Conditions Sym Parameter Min Typ Max Units Conditions V Supply voltage 2.0 - 5.8 V --- DD T Operating temperature -40 - 85 C --- A Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2