Supertex inc. HV858 Tri-EL Lamp Driver IC Features General Description Tri-EL lamp driver with common terminal The Supertex HV858 is a high voltage triple EL lamp driver 2 2 designed for driving combined EL lamps of up to 3.0in (1.0in Independent brightness control for all 3 lamps each). The input supply voltage range is from 1.73 - 6.5V. The 1.73 - 6.5V operating supply voltage device is designed such that the input voltage to the inductor can Output voltage regulation be different from the input voltage to the device (split supply). The Two-pin serial data communication for control device uses a single inductor and a minimum number of passive Linear brightness control with seven steps at components. The nominal regulated output voltage that is applied constant efficiency to the EL lamp is 95V. The HV858 has two internal oscillators, 128kHz fixed switching frequency one for the internal switching MOSFET, and the other for the high Split supply capability voltage EL lamp driver. The EL lamp frequency is fixed internally at Patented high efficiency EL lamp driver 500Hz. The power converter oscillator runs 256 times faster than Single miniature inductor drives all 3 lamps the EL lamp driver at 128kHz. Only 4 external components Burst mode power converter for best efficiency An external inductor is connected between the LX and VDD pins CMOS compatible serial interface with noise (or between the LX pin and a separate voltage source in the case rejection of a split supply application). A 0.001 - 0.01F, 100V capacitor 500nA max. leakage current when disabled is connected between the CS pin and ground. The switching Power-on reset causes all outputs to be off when MOSFET charges the external inductor and discharges it into the first powered up capacitor at the CS pin. The voltage at the CS pin will start to increase. Once the voltage at the CS pin reaches a nominal value Applications of 95V, the switching MOSFET is turned OFF to conserve power. Mulit-segment, variable displays One side of the 3 EL lamps is connected to the COM pin of the Cell phone keypads and displays HV858, the other side to the EL1, EL2, and EL3 pins. Each EL MP3 players lamp output may be independently controlled to have one of the 7 brightness levels or can be completely turned OFF by a 10- bit serial data input register. The 10-bit control code has 3 bits to control the brightness level of each EL Lamp and one bit to optionally control the power converter. The 3-bit binary brightness control code controls the number of 500Hz cycles (from 0 to 7) in a group of 7 cycles. Typical Application Circuit D + L X C V C S IN IN 1 10 - LX CS HV858 2 9 GND COM 3 8 EL Lamp 3 VDD EL3 + C V 4 7 DD DD SDI EL Lamp 2 EL2 - 5 6 SCK EL1 EL Lamp 1 Serial Data In Clock Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com HV858 Ordering Information Pin Configurations Package Options LX 1 10 CS LX 1 10 CS 2 9 10-Lead DFN 10-Lead MSOP GND COM 2 9 COM GND Device 3.00x3.00mm body 3.00x3.00mm body 3 8 8 VDD EL3 VDD 3 EL3 0.80mm height (max) 1.10mm height (max) SDI 4 7 EL2 SDI 4 7 0.50mm pitch 0.50mm pitch EL2 SCK 5 6 EL1 5 6 SCK EL1 HV858 HV858K7-G HV858MG-G 10-Lead MSOP (MG) -G indicates package is RoHS compliant (Green) 10-Lead DFN (K7) (top view) (top view) Note: 1. Bottom side heat slug is at ground potential 2. Pads are at the bottom of the package Product Marking Absolute Maximum Ratings Y = Last Digit of Year Sealed H858 W = Code for Week Sealed Parameter Value YWLL L = Lot Number V , supply voltage -0.5V to +7.0V = Green Packaging DD SDI, SCK -0.5V to +7.0V Package may or may not include the following marks: Si or 10-Lead DFN (K7) V , output voltage 0.5V to +115V CS Top Marking I 0.7A peak SW H858 Power dissipation: LLLL 10-Lead DFN 1.6W L = Lot Number 10-Lead MSOP 250mW YY = Year Sealed Bottom Marking Storage temperature -65C to +150C WW = Week Sealed = Green Packaging Operating temperature -40C to +85C YYWW Absolute Maximum Ratings are those values beyond which damage to the device may 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 Package may or may not include the following marks: Si or referenced to device ground. 10-Lead MSOP (MG) Recommended Operating Conditions Sym Parameter Min Typ Max Unit Conditions V Supply voltage 1.73 - 6.5 V --- DD f EL Lamp frequency - - 1.0 kHz --- EL I Peak switch current - - 0.4 A --- SW(PK) T Operating temperature -40 - 85 C --- A Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2