MAX1710

19-4781; Rev 0; 11/98 NUAL KIT MA ATION EET H S A EVALU T WS DA O L L O F High-Speed, Digitally Adjusted Step-Down Controllers for Notebook CPUs General Description Features o Ultra-High Efficiency o No Current-Sense Resistor (Lossless ILIMIT) o QUICK-PWM with 100ns Load-Step Response o ±1% VOUT Accuracy over Line and Load o 4-Bit On-Board DAC (MAX1710) o 5-Bit On-Board DAC (MAX1711) o 0.925V to 2V Output Adjust Range (MAX1711) o 2V to 28V Battery Input Range o 200/300/400/550kHz Switching Frequency o Remote GND and VOUT Sensing o Over/Undervoltage Protection o 1.7ms Digital Soft-Start o Drives Large Synchronous-Rectifier FETs o 2V ±1% Reference Output o Power-Good Indicator o Small 24-Pin QSOP Package MAX1710/MAX1711 The MAX1710/MAX1711 step-down controllers are intended for core CPU DC-DC converters in notebook computers. They feature a triple-threat combination of ultra-fast transient response, high DC accuracy, and high efficiency needed for leading-edge CPU core power supplies. Maxim’s proprietary QUICK-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns “instant-on” response to load transients while maintaining a relatively constant switching frequency. High DC precision is ensured by a 2-wire remote-sensing scheme that compensates for voltage drops in both ground bus and the supply rail. An on-board, digital-toanalog converter (DAC) sets the output voltage in compliance with Mobile Pentium I...