EL7520 and EL7520A are 4-channel DC/DC controllers that provide a complete power supply system for TFT-LCD applications. They consist of a 1MHz PWM boost controller, which generates the main voltage for the column driver, and three LDO controllers for V_ON, V_OFF, and V_LOGIC supplies. They also include integrated start-up sequence and start-up delay control.

EL7520 and EL7520A operate from 3V to 5.5V. The boost controller can drive a wide range of output current depending on the external FET. It can be programmed to operate in either P-mode for fast transient response or PImode for improved load regulation. The EL7520 and EL7520A also integrate fault protection for all four output channels. When a fault is detected, the device is latched off until either the input supply voltage or enable is cycled. Therefore, they are ideal to use in any size of TFT-LCD panels.

The EL7520 and EL7520A are available in a 20 Ld 4x4 QFN package with maximum height of 0.9mm and is specified for operation of the -40°C to +85°C temperature range.

• Complete TFT-LCD supply controller
  • 1MHz PWM boost controller
  • V_ON LDO controller
  • V_OFF LDO controller
  • Logic supply LDO controller
• Integrated start-up sequence for V_LOGIC/V_BOOST, V_OFF, V_ON or V_LOGIC, V_OFF, V_BOOST, V_ON
  • V_LOGIC permanently enabled in 'A version (EL7520A)
• Programmable sequence delay
• In-rush current control
• Fully fault protected
• Thermal shutdown
• Internal soft-start
• 3V to 5.5V VDD
• 20 Ld 4x4 QFN package
• Low cost
• Pb-Free plus anneal available (RoHS compliant)

• LCD monitors (15"+)
• LCD-TV (up to 40"+)
• Notebook displays (up to 16")
• Industrial/medical LCD displays