MAX17075

The MAX17075 includes a high-voltage boost regulator,one high-current operational amplifier, two regulated charge pumps, and one MLG block for gate-driver supply modulation.The gate-on and gate-off charge pumps provide regulated TFT gate-on and gate-off supplies. Both output voltages can be adjusted with external resistive voltage-dividers.

Features of the MAX17075 are:(1)2.5V to 5.5V input operating range; (2)regulated charge pump for TFT gate-on supply; (3)regulated charge pump for TFT gate-off supply; (4)logic-controlled high-voltage switches with adjustable delay; (5)soft-start and timed delay fault latch for all outputs; (6)overload and thermal protection; (7)high-current 18V VCOM buffer.The step-up DC-DC converter is a 1.2MHz currentmode boost regulator with a built-in power MOSFET. It provides fast load-transient response to pulsed loads while producing efficiencies over 85%. The built-in 160m (typ) power MOSFET allows output voltages as high as 18V boosted from inputs ranging from 2.5V to 5.5V. A built-in 7-bit digital soft-start function controls startup inrush currents.

The absolute maximum ratings of the MAX17075 can be summarized as:(1)VCC, CTL, RSTIN, RST to AGND:-0.3V to +7.5V;(2)PGND, BGND to AGND:-0.3V to +0.3V;(3)storage temp:-65 to +160;(4)operating temp:-40 to 85;(5)SRC to SUP:23V;(6)LX, PGND RMS current rating:2.4A.Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.The MAX17075 contains a step-up switching regulator to generate the source driver supply, and two chargepump regulators to generate the gate-driver supplies.Each regulator features adjustable output voltage, digital soft-start, and timer-delayed fault protection. The step-up regulator uses fixed-frequency current-mode control architecture. The MAX17075 also includes one high-performance operational amplifier designed to drive the LCD backplane (VCOM). The amplifier features high output current, fast slew rate (45V/s), wide bandwidth (20MHz), and rail-to-rail outputs. In addition, the MAX17075 features a high-voltage switch-control block, a 1.25V reference output, well-defined power-up and power-down sequences, and thermal-overload protection.