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.

特性 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)