Supertex inc. HV850 High Voltage, Low Noise, Inductorless EL Lamp Driver Features General Description No external components required when using an The Supertex HV850 is a high voltage electroluminescent external EL clock frequency (EL) Lamp Driver IC. It is designed to drive EL lamps of up to 2 EL frequency can be set by an external resistor 1.5in , with capacitive values up to 5.0nF. The HV850 converts Low noise a low voltage DC input to a high voltage AC output across an EL lamp. It uses a charge pump scheme to boost the input DC to AC converter voltage, eliminating the need for external inductors, diodes, 2 Drives up to 5.0nF load (approx. 1.5in lamp) and high voltage capacitors, components commonly found in Output voltage regulation conventional topologies. Enable function EL Lamp dimming The charge pump circuit discharges its energy into an EL lamp through a high voltage H-bridge. Once the voltage reaches its regulated limit, it is turned off to conserve power. The EL Applications lamp is then discharged to ground and the H-bridge changes state to allow the charge pump to charge the EL lamp in the Cell phone keypads and displays opposite direction. Transceivers MP3 players The EL lamp frequency can be set either by an external Watches resistor, R , or by applying an external clock, where the clock EL Pagers frequency is divided by 128 to set the EL lamp frequency. Measuring instruments/gauges Typical Application Circuits (For V = 3.4V to 4.2V only) DD V = ON DD GND = OFF 1 VDD 8 VA + EL Lamp V HV850 C DD DD 2 REL 7 VB - 3 EN GND 6 V DD V 4 5 DD CLKIN CLKEN GND EL lamp frequency set by an external clock 1 VDD 8 VA + R HV850 EL Lamp V C EL DD DD 2 REL VB 7 - 3 EN GND 6 V = ON DD 4 CLKIN CLKEN 5 GND = OFF EL lamp frequency set by R EL Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com HV850 Ordering Information Pin Configuration Package Options VDD 1 8 VA 8-Lead MSOP Device 3.00x3.00mm body REL 2 7 VB 1.10mm height (max) 0.65mm pitch EN 3 6 GND HV850 HV850MG-G -G indicates package is RoHS compliant (Green) CLKIN CLKEN 4 5 8-Lead MSOP (MG) (top view) Product Marking Top Marking Absolute Maximum Ratings H850 Parameter Value LLLL L = Lot Number V , supply voltage -0.5V to 4.5V YY = Year Sealed DD Bottom Marking Operating temperature -25C to +85C WW = Week Sealed = Green Packaging Storage temperature -65C to +150C YYWW Power dissipation 300mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and Package may or may not include the following marks: Si or functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. 8-Lead MSOP (MG) Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended Operating Conditions Sym Parameter Min Typ Max Units Conditions V Input voltage 3.0 - 4.2 V --- DD f EL lamp frequency 50 - 500 Hz --- EL C EL lamp capacitance 0 - 5.0 nF --- LOAD O T Operating temperature -25 - +85 C --- A Electrical Characteristics (Unless otherwise specified V = 3.5V, T = 25C) DD A Sym Parameter Min Typ Max Units Conditions I Quiescent current - - 150 nA EN = 0V DDQ V or V Peak output voltage 63 70 77 V A B No load. V - V Peak to peak output voltage 126 140 154 V A B f EL lamp frequency 225 250 275 Hz R = 1.65M or CLK = 32kHz EL EL I Operating current - - 16 mA DD See Figure 1, V = 3.5V, V or V Peak output voltage 54 - 74 V DD A B R = 1.5M, EL V - V Peak to peak output voltage 108 - 148 V A B Load = 3.3nF + 1.0k f EL lamp frequency 250 294 338 Hz EL 2 t Output voltage rise time 1.5 - - ms f = 250Hz, 1in lamp, 10 to 90% of final value ROUT EL Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2