EL7520A

Features:

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




Application

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




Pinout






Specifications

V_DELB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25V
V_DRVP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36V
V_DRVN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-20V
V_DDP,V_DD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5V




Description

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 VON, VOFF, and VLOGIC 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 -40C to +85C temperature range.