CMOS, 1.3µS, 8-BIT ADC WITH VOLTAGE REFERENCE AND TRACK/HOLD

The 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. notebook computers. The Maxim proprietary Quick-PWM controllers are free running, constant on-time with input feed forward. This configuration provides ultra-fast transient response, wide input-output (I/O) differential range, low supply current, and tight load-regulation characteristics. The controllers can accurately sense the inductor current across an external current-sense resistor in series with the output to ensure reliable overload and inductor saturation protection. Alternatively, the controllers can use the synchronous rectifier itself or lossless inductor current-sensing methods to provide overload protection with lower power dissipation.

• Inductor-Saturation Protection
• Accurate Differential Current-Sense Inputs
• Dual Ultra-High-Efficiency Quick-PWMs with 100ns Load-Step Response
• 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