General Description
The MAX1540/MAX1541 dual pulse-width modulation (PWM) controllers provide the high efficiency, excellent transient response, and high DC-output accuracy necessary for stepping down high-voltage batteries to generate low-voltage chipset and RAM power supplies in notebook computers.

Features
♦ Inductor-Saturation Protection
♦ Accurate Differential Current-Sense Inputs
♦ Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response
♦ MAX1540
    1.8V/1.2V Fixed or 0.7V to 5.5V Adjustable Output (OUT1)
    2.5V/1.5V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
    Fixed 5V, 100mA Linear Regulator
♦ MAX1541
    External Reference Input (REFIN1)
    Dynamically Selectable Output Voltage—0.7V
    to 5.5V (OUT1)
    2.5V/1.8V Fixed or 0.7V to 5.5V Adjustable Output (OUT2)
    Optional Power-Good and Fault Blanking During Transitions
    Fixed 5V or Adjustable 100mA Linear Regulator
♦ 1% VOUT Accuracy over Line and Load
♦ 2V to 28V Battery Input Range
♦ 170kHz to 620kHz Selectable Switching Frequency
♦ Overvoltage/Undervoltage-Protection Option
♦ 1.7ms Digital Soft-Start
♦ Drives Large Synchronous-Rectifier FETs
♦ 2V ±0.7% Reference Output
♦ Separate Power-Good Window Comparators

Applications
    Notebook Computers
    Core/IO Supplies as Low as 0.7V
    0.7V to 5.5V Supply Rails
    CPU/Chipset/GPU with Dynamic Voltage Core Supplies (MAX1541)
    DDR Memory Termination (MAX1541)
    Active Termination Buses (MAX1541)