Supertex inc. HV845 Low Noise Dual EL Lamp Driver Features General Description The Supertex HV845 is a low noise, high voltage driver Low audible noise designed for driving two EL lamps with a combined area of 3.5 Independent input control for lamp selection square inches. The input supply voltage range is from 2.0 to 180V output voltage PP 5.8V. The device is designed to reduce the amount of audible Split supply capability noise emitted by the lamp. This device uses a single inductor Patented output timing and minimum number of passive components to drive two EL One miniature inductor to power both lamps lamps. The nominal regulated output voltage of 90V is applied Low shutdown current to the EL lamps. The two EL lamps can be turned ON and OFF Wide input voltage range 2.0 to 5.8V by the two logic input control pins, C1 and C2. The device is Output voltage regulation disabled when both C1 and C2 (pins 12 and 3) are at logic low. No SCR output Available in 12-Lead QFN package The HV845 has an internal oscillator, a switching MOSFET, and two high voltage EL lamp drivers. Each driver has its own half bridge common output COM1 and COM2, which significantly Applications minimizes the DC offset seen by the EL lamp. An external resistor Dual display cellular phones connected between the RSW-Osc pin and the voltage supply Keypad and LCD backlighting pin, VDD, sets the frequency for the switching MOSFET. The EL Portable instrumentation lamp driver frequency is set by dividing the MOSFET switching Dual segment lamps frequency by 512. An external inductor is connected between Hand held wireless communication devices the LX and the VDD pins. Depending on the EL lamp size, a 1.0 to 10.0nF, 100V capacitor is connected between CS and Ground. 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. Typical Application Circuit 330H D C S + LX C 3.3nF, V IN IN 4.7F 5 100V - 6 CS LX 1 10 EL Lamp 1 VDD + EL1 C 845k HV845 DD 2 8 V DD 0.1F RSW-Osc COM1 - EL Lamp 2 9 12 EL2 C1 1.5V 3 7 0 C2 COM2 GND 1.5V 4 0 Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com HV845 Ordering Information Pin Configuration C1 NC EL1 12-Lead QFN 12 11 10 3.00x3.00mm body Device 0.80mm height (max) 0.50mm pitch 9 VDD 1 EL2 HV845 HV845K7-G RSW-Osc 2 8 COM1 -G indicates package is RoHS compliant (Green) 3 7 C2 COM2 5 6 4 LX CS GND 12-Lead QFN (K7) (top view) Note: Pads are on the bottom of the package. Absolute Maximum Ratings Back-side heat slug is at ground potential. Parameter Value Product Marking Supply Voltage, V -0.5V to 7.5V DD Y = Last Digit of Year Sealed Output Voltage, V -0.5V to 120V CS H845 W = Code for Week Sealed Operating Temperature Range -40C to 85C L = Lot Number YWLL Storage temperature -65C to 150C = Green Packaging Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied. Continuous operation Package may or may not include the following marks: Si or of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground. 12-Lead QFN (K7) Thermal Resistance Package ja o 12-Lead QFN (K7) 60 C/W Note: Mounted on FR4 board, 25mm x 25mm x 1.57mm Recommended Operating Conditions Sym Parameter Min Typ Max Units Conditions V Supply voltage 2.0 - 5.8 V --- DD o T Operating temperature -40 - +85 C --- A Electrical Characteristics (Over recommended operating conditions unless otherwise specified - V = V = 3.3V, T = 25C) IN DD A Sym Parameter Min Typ Max Units Conditions R On-resistance of switching transistor - - 10 I = 100mA DS(ON) V Input voltage range 2.0 - 5.8 V --- DD V Output regulation voltage 80 90 100 V V = 2.0 to 5.8V CS DD Differential output peak to peak voltage V 160 180 200 V V = 2.0 to 5.8V DIFF DD (EL to COM1, EL to COM2) 1 2 - - 150 nA C = C = 0.1V 1 2 I Quiescent V supply current DDQ DD - - 250 nA C = C = 0.3V 1 2 Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2