EL7583
3-Channel DC/DC Converter

Key Features

• TFT-LCD display supply
• Boost regulator
• V_ON charge pump
• V_OFF charge pump
• 2.7V to 14V VIN supply
• 5V < V_BOOST < 17V
• 5V < V_ON < 40V
• -40V < V_OFF < 0V
• V_BOOST = 12V @ 470mA
• V_BOOST = 15V @ 370mA
• High frequency, small inductor DC/DC boost circuit
• Over 90% efficient DC/DC boost converter capability
• Adjustable frequency
• Adjustable soft-start
• Adjustable outputs
• Small parts count
• Pb-free plus anneal available (RoHS compliant)

Description

The EL7583 is a 3-channel DC/DC converter IC which is designed primarily for use in TFT-LCD applications. It features a PWM boost converter with 2.7V to 14V input capability and 5V to 17V output, which powers the column drivers and provides up to 470mA @ 12V, 370mA @ 15V from 5V supply. A pair of charge pump control circuits provide regulated outputs of V_ON and V_OFF supplies at 8V to 40V and -5V to -40V, respectively, each at up to 60mA.

The EL7583 features adjustable switching frequency, adjustable soft start, and a separate output V_ON enable control to allow selection of supply start-up sequence. An over-temperature feature is provided to allow the IC to be automatically protected from excessive power dissipation.

The EL7583 is available in a standard 20 Ld TSSOP package and the Pb-free 20 Ld HTSSOP package. Both are specified for operation over the full -40°C to +85°C temperature range.

Applications

• TFT-LCD panels
• PDAs