General Description
The MAX1540A/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
♦ MAX1540A
   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/I/O 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)