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The ISL97649B is an integrated power management IC (PMIC) for TFT-LCDs used in notebooks, tablet PCs, and monitors. The device integrates a boost converter for generating A_VDD. V_ONand V_OFF are generated by a charge pump driven by the switching node of the boost. The ISL97649B also includes a V_ON slice circuit, reset function, and a high performance VCOM amplifier with DCP (Digitally Controlled Potentiometer) that is used as a VCOM calibrator.

The A_VDD boost converter features a 1.5A /0.18Ω boost FET with 600/1200kHz switching frequency. The gate pulse modulator can control gate voltage up to 30V, and both the rate and slew delay time are selectable. The supply monitor generates a reset signal when the system is powered down.

The ISL97649B provides a programmable VCOM with I²C interface. One VCOM amplifier is also integrated in the chip. The output of VCOM is power-up with voltage at the last programmed 8-bit EEPROM setting.

Key Features

• 2.5V to 5.5V input
• 1.5A, 0.18Ω integrated boost FET
• VON /VOFF supplies generated by charge pumps driven by boost switch node
• 600/1200kHz selectable switching frequency
• Integrated gate pulse modulator
• Reset signal generated by supply monitor
• Integrated VCOM amplifier
• DCP
  • I2C serial interface, address:100111, msb left
  • Wiper position stored in 8-bit nonvolatile memory and recalled on power-up
  • Endurance, 1,000 data changes per bit
• UVLO, UVP, OVP, OCP, and OTP protection
• Pb-free (RoHS compliant)
• 28 Ld 4x5 QFN

Applications

• LCD notebook, tablet, and monitor