ISL97652
4-Channel Integrated LCD Supply with Dual VCOM Amplifiers
Key Features
- 8V to 15V input supply
- AVDD boost up to 19.5V (OVP threshold), with integrated 2.8APEAK FET
- Overvoltage protection (OVP)
- 2A integrated AVDD delay FET, with short circuit protection
- Dual charge pump controllers for VON and VOFF
- VLOGIC buck with integrated 2.5APEAK FET
- VON slicing
- Dual high speed VCOM amplifiers
- 650kHz/1.3MHz switching frequency
- Integrated sequencing
- UVLO and OTP protection
- Thermally enhanced 7x7 QFN package
- Pb-free (RoHS compliant)
Description
The ISL97652 represents a high power, integrated LCD supply IC targeted at large panel LCD displays. The ISL97652 integrates a high power, boost converter for AVDD generation, delay switch, regulated VON and VOFF charge pumps, VON slicing circuitry, a buck regulator for logic supply generation and dual high power VCOM amplifiers.
Operating at 650kHz or 1.3MHz, the AVDD boost converter features a 2.8A boost FET. A short circuit protected AVDD delay switch is integrated to provide sequencing of the AVDD output. Feedback is taken from the far side of the delay FET for improved regulation and an OVP circuit protects output side components. The boost features programmable soft-start.
The asynchronous buck converter features an integrated 2.5A FET. It also operates from the 650kHz or 1.3MHz internal clock and features separate enable and soft-start control.
The dual charge pump controllers used for VON and VOFF generation uses the full FOSC switching frequency to allow the use of small output components for board space efficiency. VON is further processed through an integrated VON-SLICE circuit for reduced flicker.
The integrated amplifiers feature high slew-rate and high output current capability. They are permanently enabled when AVIN is present.
Available in the 48 Ld 7mmx7mm QFN package, the ISL97652 is specified for ambient operation over the -40°C to +85°C temperature range.
Applications
- LCD-TVs (up to 40")
- Industrial/medical LCD displays
