Supertex inc. HV861 Dimmable, Low Noise, Dual EL Lamp Driver Features the regulated output voltage is at a nominal value of 90V. Adjustable output regulation for dimming Lamp fade-in/fade-out capability The EL Lamps will therefore see 90V. The two EL Lamps Low audible noise can be turned ON and OFF using two CMOS logic inputs, 180V output voltage for higher brightness EN1 and EN2. The driver is disabled when both EN1 and PP 1.5V enable input logic high EN2 are at logic low. Single cell lithium ion compatible One miniature inductor to power both lamps The HV861 has two internal oscillators, a switching MOSFET, Separately adjustable lamp and converter frequencies and two high voltage EL Lamp driver H-bridges. Each driver Split supply capability has its own half bridge common output, COM1 and COM2, 16-Lead QFN package which signicantly minimizes the DC offset seen by the EL Lamp. The frequency for the switching MOSFET is set by an Applications external resistor connected between the RSW-Osc pin and Dual display cellular phones the supply pin VDD. The EL Lamp driver frequency is set Keypad and LCD backlighting by an external resistor connected between the REL-Osc pin PDAs and the VDD pin. An external inductor is connected between Handheld wireless communication products the LX and VDD pins or VIN for split supply applications. Global Positioning Systems (GPS) Depending upon the EL Lamp sizes, a 1.0nF to 10.0nF capacitor is connected between the CS and ground. General Description The Supertex HV861 is a low noise, dimmable, high As the switching MOSFET charges the external inductor voltage, dual EL Lamp driver designed for driving two and discharges it into the capacitor at CS, the voltage at electroluminescent (EL) Lamps with a combined area of 5.0 CS will start to increase. Once the voltage at CS reaches a square inches. The input supply voltage range is from 2.5V nominal value of 90V, the switching MOSFET is turned OFF to 4.5V. Enable input logic high can go as low as 1.5V, which to conserve power. allows logic interface operating from typical 1.8V supplies. The device is designed to minimize audible noise emitted by EL Lamp dimming can be accomplished by applying a PWM the EL Lamps. logic signal to the PWM pin. The EL Lamp brightness will be inversely proportional to the PWM duty cycle. The HV861 The device uses a single inductor and a minimum number of can also slowly turn the EL Lamp ON/OFF giving a fade ON/ passive components. Using the internal reference voltage, OFF appearance. Typical Application Circuit V = 3.2 to 4.2V IN 100H Coilcraft 1N4148 4.7F LPS4012 3.3M 3.3nF 15 14 7 8 100V NPO VREG VOUT LX CS 12 3 EL1 V = 3.0V VDD DD HV861K7-G 2.0M EL1 1 0.1F REL-Osc 11 COM1 2 RSW-Osc 9 EL2 825k Input Logic Control: 4 EL2 EN1 10 ON = 1.5 to V 5 COM2 DD EN2 OFF = 0 to 0.2V VREF PWM GND 16 13 6 2.2F Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.comHV861 Ordering Information Pin Conguration VREF VREG VOUT PWM 16-Lead QFN 16 14 13 15 3.00x3.00mm body Device 0.80mm height (max) 0.50mm pitch REL-Osc EL1 1 12 HV861 HV861K7-G RSW-Osc COM1 2 11 -G indicates package is RoHS compliant (Green) VDD 3 10 COM2 EN1 EL2 4 9 5 6 7 8 EN2 GND LX CS 16-Lead QFN Package Absolute Maximum Ratings Note: Pads are at the bottom of the package. Center heat slug is at ground Parameter Value potential. V , supply voltage -0.5V to 5.5V DD Product Marking Operating temperature -40C to +85C Storage temperature -65C to +150C Y = Last Digit of Year Sealed H 8 6 1 W = Code for Week Sealed Power dissipation 1.6W Y W L L L = Lot Number V , output voltage -0.5V to +120V CS = Green Packaging Absolute Maximum Ratings are those values beyond which damage to the Package may or may not include the following marks: Si or device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect 16-Lead QFN Package device reliability. All voltages are referenced to device ground. Thermal Resistance Package ja 16-Lead QFN 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 100 - 500 Hz --- EL C Total EL Lamp capacitance load 0 - 20 nF --- LOAD T Operating temperature -40 - +85 C --- A Electrical Characteristics (Over recommended operating conditions unless otherwise specied) Sym Parameter Min Typ Max Units Conditions R On-resistance of switching transistor - - 7.0 I = 100mA DS(ON) V Maximum output regulation voltage 80 90 100 V V = 2.5V to 4.5V CS DD - 78 - V = 2.5V to 4.5V, V = 1.092V DD REG V Output regulation voltage - 62 - V V = 2.5V to 4.5V, V = 0.862V CS DD REG - 45 - V = 2.5V to 4.5V, V = 0.632V DD REG V External input voltage range 0 - 1.40 V V = 2.5V to 4.5V REG DD Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2