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The ISL98603 represents a high power, integrated LCD supply IC targeted at large panel LCD displays. The ISL98603 integrates a high power boost converter for AVDD generation, V_ON and V_OFF charge pump drivers, one synchronous buck regulator, and one synchronous buck controller for 2 logic voltages. The V_ON slicing circuitry and
power-good function are also included.

Operating at 1.3MHz, the AVDD boost converter features a 5.0A boost FET. Feedback is taken from the far side of the delay FET for improving regulation. The OVP circuit protects output side components.

The logic synchronous buck converter features two 2.3A FETs operating at 1.3MHz internal clock. The output voltage is set by the IC internally or feedback resistor. The
soft-start circuitry are also integrated with the buck.

The second logic voltage is generated from synchronous buck converter with MOSFET controllers. The overcurrent protection is also integrated with the buck.

The charge pump of V_ON and V_OFF use the full switching frequency and integrates the driver for high current capability. V_ON is further processed through an integrated V_ON Slice circuit in order to reduce flicker.

Alternative fixed voltages at the boost, Buck1, Buck2, V_ON charge pump, and V_OFF charge pump are available in ISL98603.

Key Features

• 9.5V to 15.0V Input Supply
• 1.3MHz Switching Frequency
• 5.0A Integrated Boost for Up to 19V AVDD
• VON Charge Pump, Up to 36V and 120mA
• VOFF Charge Pump, Down to -10V and 120mA
• Synchronous Buck1 for 3.3V/2.5V with 2.0A Peak FET
• Synchronous Buck2 Controller Output from 0.9V to 2.0V
• AVDD Delay Switch Capable of Soft-starting into a Highly Capacitive, Heavy Load
• VON Slice Function Integrated
• Power-Good Function for TCON Enable
• Automatic Start-Up Sequencing
• UVLO, UVP, OVP, OCP, and OTP Protection
• 40 Ld 6x6 QFN
• Specified for Ambient Operation Over the -40°C to +85°C Temperature Range
• Pb- Free (RoHS Compliant)

Applications

• LCD TV