EL7584
4-Channel DC/DC Converter
Typical Diagram
Key Features
- TFT-LCD display supply
- Boost regulator
- VCOM buffer
- VON charge pump
- VOFF charge pump
- 2V to 14V VIN supply
- 5V < VBOOST < 17V
- 2V < VCOM < 13V
- 5V < VON < 40V
- -40V < VOFF < 0V
- VBOOST = 15V at 370mA
- High frequency, small inductor DC/DC boost circuit
- Over 90% efficient DC/DC boost converter capability
- Built-in power-up sequence with adjustable VON delay
- Adjustable frequency
- Adjustable soft-start
- Adjustable outputs
- Over-temperature protection
- Small parts count
- Pb-free available (RoHS compliant)
Description
The EL7584 is a 4-channel DC/DC converter IC which is designed primarily for use in TFT-LCD applications. The boost converter has 2V to 14V input capability and provides 5V to 17V output, which powers the column drivers and provides up to 370mA at 15V. A pair of charge pump control circuits provide outputs to allow the external generation of VON and VOFF supplies at 5V to 40V and 0V to -40V, respectively, each at up to 60mA for VBOOST = 15V. The VCOM buffer provides up to 50mA continuous output current from 2V to 13V.
The EL7584 features adjustable switching frequency and on-chip power sequence to simplify start-up operation. A separate input is available to externally increase the default delay of the positive charge pump. An over-temperature feature is provided to allow the IC to be automatically protected from excessive power dissipation.
The EL7584 is available in a 24-pin TSSOP package and is specified for operation over the full -40°C to +85°C temperature range.
Applications
- TFT-LCD panels
- PDAs
