MAX1540A Datasheet | Maxim Integrated

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 puters. 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. For a single step-down PWM controller with inductorsaturation protection, external-reference input voltage, and dynamically selectable output voltages, refer to the MAX1992/MAX1993 data sheet. 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, 100m A 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 100m A Linear Regulator - 1% VOUT Accuracy over Line and Load - 2V to 28V Battery Input Range - 170k Hz to 620k Hz 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...