Supertex inc. HV881 Dimmable, Low Noise, 16 channel EL Lamp Driver Features The HV881 has two internal oscillators and a high voltage Sixteen channel EL lamp driver with single common EL lamp driver. An external MOSFET is driven by the switch terminal oscillator to generate output voltage. 1nF maximum load on each of the sixteen channels Independent dimming capability for all lamps The frequency for the external switching MOSFET is set Sixteen brightness levels for each lamp by an external resistor connected between the RSW-Osc 1.8 to 5.5V operating supply range pin and the VDD supply pin. The EL lamp driver frequency 1.7V logic interface can be set by either an external logic signal frequency at Dedicated enable logic pin the SEL pin or by an external resistor connected between 340V nominal output voltage for high brightness P-P the REL-Osc pin and VDD pin. If external frequency is input Low audible noise at the SEL pin, the REL-Osc pin should be connected to Output voltage regulation ground. EL1 - EL16 outputs fall time control Two EL frequency controls An external inductor is connected between the LX and VDD or VIN pins for split supply applications. Depending upon External switching MOSFET 2 the EL lamp sizes, a 1.0 to 10.0nF capacitor is connected I C data communication control between the CS pin and ground. The C capacitor is Single lithium-ion cell compatible S connected to the internal H-bridge, and the energy stored One miniature inductor to power sixteen lamps in the capacitor is therefore transferred to the EL lamp. Independent lamp and converter frequency setting One side of all the sixteen EL lamps is connected to the Split supply capability respective EL pins (EL1, EL2, etc.), and the other side is 5x5mm, 32-Lead QFN package connected to the COM pin. Applications The external switching MOSFET charges the inductor and discharges it into the capacitor at CS. The voltage at CS Multi-segment, variable displays will start to increase. Once the voltage at CS reaches the Cell phone keypads and displays desired regulation limit, the external switching MOSFET is Multi-segment remote controls turned off to conserve power. Handheld wireless communication products Global Positioning Systems (GPS) The HV881 allows for controlling the fall time of the EL1 General Description - EL16 outputs by an external resistor from the RSLOPE The Supertex HV881 is a 16 channel EL lamp driver with a pin to the VDD pin. This feature can be used to reduce single common terminal. It can drive up to a 1nF EL lamp load the audible noise of the EL lamp or to increase the lamp (approx. 0.3in2 lamp size) on each of the sixteen channels. brightness. The input supply voltage range is 1.8 to 5.5V. The logic interface to the device can be as low as 1.7V. The device The brightness of each of the sixteen EL lamps can be has an enable logic input pin to turn the device on or off. independently controlled to have one of fifteen brightness levels or can be completely turned off by the serial data The device is designed to minimize audible noise emitted by (SDA) input. The serial data input has a 4-bit binary code the EL lamp. The HV881 uses an external MOSFET, a single for each lamp, to control the brightness level from level 0 inductor and minimum number of passive components to to level 15. The brightness is controlled by controlling the drive all sixteen EL lamps. The device is designed such that number of EL frequency cycles (from 0 to 15) in a group of the input voltage to the inductor can be different from the 15 cycles. input voltage to the device (split supply). Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com HV881 Ordering Information Pin Configuration 32 32-Lead QFN 5.00x5.00mm body Device 0.8mm height (max) 1 0.50mm pitch HV881 HV881K7-G -G indicates package is RoHS compliant (Green) 32-Lead QFN Package (top view) Absolute Maximum Ratings Note: Pads are at the bottom of the package. Center heat slug is at ground Parameter Value potential. V , supply voltage -0.5 to 7.0V DD EN, SDA, SCL, S -0.5 to V +0.5V Product Marking EL DD V , output voltage -0.5 to 215V L = Lot Number CS HV881 YY = Year Sealed V , external input voltage 0.48V REG LLLLLL WW = Week Sealed Storage temperature -65C to +150C YYWW A = Assembler ID Maximum junction temperature +125C AAACCC C = Country of Origin Absolute Maximum Ratings are those values beyond which damage to the = Green Packaging device may occur. Functional operation under these conditions is not implied. Continuous operation of the device at the absolute rating level may affect 32-Lead QFN Package device reliability. All voltages are referenced to device ground. Package may or may not include the following marks: Si or Thermal Resistance Package ja 32-Lead QFN 25C/W (Mounted on 4-layer FR4 9-via PCB, 76mm x 114mm x 1.44mm) Recommended Operating Conditions Sym Parameter Min Typ Max Units Conditions V Supply voltage 1.8 - 5.5 V --- DD f Switching frequency 50 - 200 kHz --- SW f EL output frequency 200 - 1000 Hz --- EL S Input for EL output frequency 1600 - 8000 Hz S = 8 x (f ) and 50% duty cycle EL EL EL C Lamp capacitance per EL output 0 - 1.0 nF --- LOAD C COM lamp capacitance 0 - 16 nF --- COM T Operating temperature -40 - +85 C --- j Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2