EL7520
4-Channel DC/DC Controller
Key Features
- Complete TFT-LCD supply controller
- 1MHz PWM boost controller
- VON LDO controller
- VOFF LDO controller
- Logic supply LDO controller
- Integrated start-up sequence for VLOGIC/VBOOST, VOFF, VON or VLOGIC, VOFF, VBOOST, VON
- VLOGIC 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)
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 -40°C to +85°C temperature range.
Applications
- LCD monitors (15"+)
- LCD-TV (up to 40"+)
- Notebook displays (up to 16")
- Industrial/medical LCD displays
