The N1153 is a low-cost, 5 bit TTL-compatible input, digital-to-analog (DAC) programmable, synchronous buck converter controller designed specifically to power the Pentium II as well as the next generation of P6 family or other high performance core logic in desktop personal computer CPU applications. Additional features also include temperature compensated voltage reference, triangle wave oscillator, current limits comparator, frequency shift over-current protection, and an accessible, internally compensated error amplifier, power good signal, logic compatible shutdown, and over voltage protection are also provide.