15A Step-Down Regulator - Maxim Integrated Products
Description
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19-4123; Rev 2; 10/08
15A Step-Down Regulator with Internal Switches
General Description
The MAX15035 pulse-width modulation (PWM) controller provides high efficiency, excellent transient response, and high DC-output accuracy.
Combined with the internal low on-resistance MOSFETs, the MAX15035 provides a highly efficient and compact solution for small form factor applications that need a high-power density.
Maxim’s proprietary Quick-PWM™ quick-response, constant on-time PWM control scheme handles wide input/output voltage ratios (low-duty-cycle applications) with ease and provides 100ns instant-on response to load transients while maintaining a relatively constant switching frequency.
The output voltage can be dynamically controlled using the dynamic REFIN, which supports input voltages between 0V to 2V.
The REFIN adjustability combined with a resistive voltage-divider on the feedback input allows the MAX15035 to be configured for any output voltage between 0V to 0.
9VIN.
The controller senses the current across the synchronous rectifier to achieve a low-cost and highly efficient valley current-limit protection.
External current-limit control is provided to allow higher current-limit settings for applications with heatsinks and air flow, or for lower current applications that need lower current-limit settings to avoid overdesigning the application circuit.
The adjustable current limit provides a high degree of flexibility, allowing thermally compensated protection or foldback current-limit protection using a voltage-divider partially derived from the output.
The MAX15035 includes a voltage-controlled soft-start and soft-shutdown to limit the input surge current, provide a monotonic power-up into a precharged output, and provide a predictable soft-start time.
The controller also includes output fault protection—undervoltage and overvoltage protection—as well as thermal-fault protection.
The MAX15035 is available in a small 40-pin, 6mm x 6mm, TQFN ...
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