Maxim claims that its latest boost regulator integrates all the functions required to power the source drivers, gate drivers, and VCOM backplane in LCDs. With charge pumps, switch control, and a high-current operational amplifier, the MAX17075 has been designed as a cost-effective, high-performance solution for LCD monitors and TVs.
To minimise size, this step-up DC/DC converter has a 1.2MHz switching frequency, which allows the use of low-profile inductors and ceramic capacitors. The device also integrates a power MOSFET and digital soft-start to reduce the number of external components required to control inrush currents. Output voltage is up to 18V from a 2.5V to 5.5V input, which Maxim claims it achieves at more than 85% power efficiency.
Integrated charge pumps provide LCD gate-on and gate-off supplies, and allow the output voltage to be adjusted using external resistive voltage-dividers. A built-in op amp drives the VCOM backplane and features 500mA short-circuit current with a 45V/microsecond slew rate.
The MAX17075 is available in a 4 x 4mm, 24pin TQFN package, and operates across the “40 to +85oC temperature range.