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 V_ON and V_OFF supplies at 5V to 40V and 0V to -40V, respectively, each at up to 60mA for V_BOOST = 15V. The V_COM 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.

• TFT-LCD display supply
  • Boost regulator
  • V_COM buffer
  • V_ON charge pump
  • V_OFF charge pump
• 2V to 14V VIN supply
• 5V < V_BOOST < 17V
• 2V < V_COM < 13V
• 5V < V_ON < 40V
• -40V < VOFF < 0V
• V_BOOST = 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 V_ON delay
• Adjustable frequency
• Adjustable soft-start
• Adjustable outputs
• Over-temperature protection
• Small parts count
• Pb-free available (RoHS compliant)

• TFT-LCD panels
• PDAs