ISL97651
4-Channel Integrated LCD Supply

Key Features

• 4V to 5.5V input supply
• A_VDD boost up to 20V, with integrated 4.4A FET
• Integrated V_ON charge pump, up to 34V_OUT
• V_OFF charge pump driver, down to -18V
• V_LOGIC buck down to 1.2V, with integrated 2A FET
• Automatic start-up sequencing
• A_VDD -> V_OFF -> V_ON or A_VDD/V_OFF -> V_ON
• Independent logic enable
• V_ON slicing
• Thermally enhanced thin QFN package (6mmx6mm)
• Pb-free (RoHS compliant)

Description

The ISL97651 represents a high power, integrated LCD supply IC targeted at large panel LCD displays. The ISL97651 integrates a high power, 4.4A boost converter for A_VDD generation, an integrated V_ON charge pump, a V_OFF charge pump driver, V_ON slicing circuitry and a buck regulator with 2A switch for logic generation.

The ISL97651 have been designed for ease of layout and low BOM cost. Supply sequencing is integrated for both A_VDD -> V_OFF -> V_ON and A_VDD/V_OFF -> V_ON sequences. The TFT power sequence uses a separate enable to the logic buck regulator for maximum flexibility.

Peak efficiencies are 90% for boost and 92% for buck while operating from a 4V to 5.5V input supply. The current mode buck offers superior line and load regulation. Available in the 36 Ld QFN package, the ISL97651 is specified for ambient operation over the -40°C to +105°C temperature range.

Applications

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