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Dual PWM step-down controllers

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article image MAX1540 dual, pulse-width modulation step-down controller.

MAXIM Integrated Products has released the MAX1540 and MAX1541 dual, pulse-width modulation (PWM) step-down controllers, available from Arrow .

The controllers are efficient and provide good transient response and dc-output.

These devices are suitable for stepping down high-voltage batteries to generate low-voltage chipset and RAM power supplies in notebook computers.

The Quick-PWM controllers are free running, with constant on-time and input feed-forward. This configuration provides rapid transient response, wide input-output differential range, low supply current, and tight load-regulation characteristics.

To ensure reliable overload and inductor saturation protection, the MAX1540 and MAX1541 sense the inductor current across an external current-sense resistor in series with the output. These controllers can also use the synchronous rectifier method or lossless inductor current-sensing method for overload protection with lower power dissipation.

The MAX1540 generates chipset, DRAM, CPU I/O, or other low-voltage supplies down to 0.7V.

The MAX1541 powers chipsets and graphics processor cores that require dynamically adjustable output voltages, or generates the active termination bus that tracks the input reference.

The MAX1540 is packaged in a 32-pin thin QFN and the MAX1541 is packaged in a 40-pin thin QFN.

Both devices have optional inductor-saturation protection and overvoltage/undervoltage protection and are screened for the extended-industrial temperature range of -40°C to +85°C.

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