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HV852

Microchip

High-Voltage Low-Noise Inductorless EL Lamp Driver

HV852 High-Voltage Low-Noise Inductorless EL Lamp Driver Features • No External Components required when using an Exte...



HV852

Microchip


Octopart Stock #: O-1522267

Findchips Stock #: 1522267-F

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Description
HV852 High-Voltage Low-Noise Inductorless EL Lamp Driver Features • No External Components required when using an External Electroluminescent (EL) Clock Frequency • EL Frequency can be set by an External Resistor • Low Noise • DC to AC Converter • Drives up to 5.3 nF Load (approximately 1.5 in 2 Lamp) • Output Voltage Regulation • Enable Function • EL Lamp Dimming Applications • Cellular Phone Keypad • Watches • Small Handheld Wireless Devices • MP3 Players General Description The HV852 is a high-voltage low-noise, inductorless EL lamp driver. It is designed to drive EL lamps of up to 1.5 in2, with capacitive values of up to 5.3 nF over an input voltage range of 2.4V to 5V. The HV852 converts 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 voltage, eliminating the need for an external inductor, diode, and high-voltage capacitor commonly found in conventional topologies. 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 lamp is then discharged to ground, and the H-bridge changes state to allow the charge pump to charge the EL lamp in the opposite direction. Package Types 10-lead WDFN (Top view) 8-lead MSOP (Top view) VDD 1 REL 2 EN 3 CLKIN 4 VDD 5 10 VA 9 VB 8 GND 7 GND 6 CLKEN VDD 1 REL 2 EN 3 CLKIN 4 8 VA 7 VB 6 GND 5 CLKEN WDFN pads are at the bottom of the packa...




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