The MAX17112 is a highly efficient, power-management IC that employs a current-mode, fixed-frequency, PWM architecture for fast-transient response and low-noise operation. The high switching frequency (1MHz) allows the use of ultra-small inductors and low-ESR ceramic capacitors. The current-mode architecture provides fasttransient response to pulsed loads. A compensation pin (COMP) gives users flexibility in adjusting loop dynamics. The internal MOSFET can generate output voltages up to 20V from a 2.6V to 5.5V input voltage. The softstart function slowly ramps the input current and is programmable with an external capacitor. The input overvoltage protection function prevents damage to the MAX17112 from input surge voltages up to 24V.

Applications

Notebook Computer Displays
LCD Monitor Panels

The error amplifier compares the signal at FB to 1.24V and varies the COMP output. The voltage at COMP determines the current trip point each time the internal MOSFET turns on. As the load changes, the error amplifier sources or sinks current to the COMP output to command the inductor peak current necessary to service the load. To maintain stability at high duty cycles, a slope compensation signal is summed with the current-sense signal. At light loads, this architecture allows the device to skip cycles to prevent overcharging the output capacitors.

Read more: http://datasheets.maxim-ic.com/en/ds/MAX17112.pdf