Microchip Technology HV857L
The HV857L is a low-noise high-voltage driver designed for driving Electroluminescent (EL) lamps of up to 5 in2. It is the low-noise version of the EL lamp driver HV857. The input supply voltage range is from 1.8V to 5V.| Part No. | HV857L |
|---|---|
| Datasheet | HV857L Download |
| Manufacturer |  Microchip Technology |
| Description | High-Voltage Low-Noise EL Lamp Driver |
| Buy | Stock & Price |
FEATURES
● Audible Noise Reduction● 190 VPP Output Voltage for Higher Brightness
● Single-cell Lithium Ion-Compatible
● 150 nA Shutdown Current
● Wide Input Voltage Range, 1.8V to 5V
● Separately Adjustable Lamp and Converter Frequencies
● Output Voltage Regulation
● Split Supply Capability
APPLICATIONS
● Mobile Cellular Phones● Keypad Backlighting
● LCD Backlighting
● PDAs
● Handheld Wireless Communication Devices
● Global Positioning Systems (GPS) Package Types
GENERAL DESCRIPTION
The device uses a single inductor and a minimum number of passive components. The nominal regulated output voltage that is applied to the EL lamp is ±95V. The chip can be enabled and disabled by connecting the resistor on RSW-Osc to VDD/ground. The HV857L has two internal oscillators, a switching MOSFET, and a high-voltage EL lamp driver. The frequency for the switching MOSFET is set by an external resistor connected between the RSW-Osc pin and the supply pin, VDD. The EL lamp driver frequency is set by an external resistor connected between the REL-Osc and VDD pins.
