HV860 Low Noise, Dimmable EL Lamp Driver The HV860 has two internal oscillators, a switching Features MOSFET, and a high voltage EL lamp driver H-bridge. The Adjustable output regulation for dimming frequency for the switching MOSFET is set by an external 220V output voltage for higher brightness resistor connected between the RSW-Osc pin and the PP Single cell lithium ion compatible supply pin VDD. The EL lamp driver frequency is set by 150nA shutdown current an external resistor connected between REL-Osc pin and VDD pin. An external inductor is connected between the LX Separately adjustable lamp and converter frequencies and VDD pins or VIN for split supply applications. A 3.0nF 3x3mm 12-Lead QFN package capacitor is connected between CS and ground. The EL Split supply capability lamp is connected between VA and VB. Applications The switching MOSFET charges the external inductor and discharges it into the capacitor at CS. The voltage at CS will Mobile cellular phone keypads start to increase. Once the voltage at CS reaches a nominal PDAs value of 110V, the switching MOSFET is turned OFF to Handheld wireless communication products conserve power. The outputs VA and VB are congured as Global Positioning Systems (GPS) an H bridge and are switching in opposite states to achieve 110V across the EL lamp. General Description EL lamp dimming can be accomplished by changing the The Supertex HV860 is a high voltage driver designed for input voltage to the VREG pin. The VREG pin allows an driving Electroluminescent, (EL), lamps of up to 5 square external voltage source to control the VCS amplitude. The inches. The input supply voltage range is from 2.5 to 4.5V. VCS voltage is approximately 87 times the voltage seen on The device uses a single inductor and a minimum number of VREG. passive components. Using the internal reference voltage, the regulated output voltage is at a nominal voltage of 110V. The EL lamp will therefore see 110V. An enable pin, (EN), is available to turn the device on and off via a logic signal. Typical Application Circuit V IN C L IN X D R REG 2 3 5 C S VREG VREF LX 10 7 V DD CS VDD R SW 12 C DD RSW-Osc 9 VA 1 EL REL-Osc R 1.5V = On EL Lamp 11 8 VB EN GND 0V = Off 4 HV860 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.comHV860 Pin Conguration Ordering Information RSW-Osc EN VDD 12-Lead QFN 11 10 3.00x3.00mm body 12 Device 0.80mm height (max) 0.50mm pitch HV860 HV860K7-G REL-Osc 1 9 VA -G indicates package is RoHS compliant (Green) VREG 2 8 VB VREF 3 7 CS 4 5 6 GND LX NC Absolute Maximum Ratings 12-Lead QFN (K7) Parameter Value (top view) Note: V , Supply voltage -0.5V to 6.0V DD Pads are at the bottom of the package. Center heat slug is at ground potential. Operating temperature -40C to +85C Storage temperature -65C to +150C Product Marking Power dissipation: 1.6W Y = Last Digit of Year Sealed H 8 6 0 V , Output voltage -0.5V to +120V W = Code for Week Sealed CS Y W L L L = Lot Number V External input voltage 1.33V REG = Green Packaging Absolute Maximum Ratings are those values beyond which damage to the device may Package may or may not include the following marks: Si or occur. Functional operation under these conditions is not implied. Continuous operation 12-Lead QFN (K7) of the device at the absolute rating level may affect device reliability. All voltages are referenced to device ground. Thermal Resistance Package ja 12-Lead QFN (K7) 60 C/W Recommended Operating Conditions Sym Parameter Min Typ Max Units Conditions V Supply voltage 2.5 - 4.5 V --- DD f Switching frequency 40 - 200 kHz --- SW f EL output frequency 150 - 500 Hz --- EL C EL lamp capacitance load 0 - 20 nF --- LOAD T Operating temperature -40 - +85 C --- A Electrical Characteristics (Over recommended operating conditions unless otherwise specied T = 25C) A Sym Parameter Min Typ Max Units Conditions R On-resistance of switching transistor - - 6.0 I = 100mA DS(ON) V Maximum output regulation voltage 90 - 120 V V = 2.5V to 4.5V CS DD 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2