DESCRIPTION

The MP9840 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with built-in power MOSFETs. It offers a very compact solution that achieves 3.5A of continuous output current with excellent load and line regulation over a wide 3.3V to 36V input supply range. The switching frequency can be programmed or synchronized to an external clock in the range of 350kHz to 2.5MHz. The synchronous operation and ultralow 14μA sleep mode quiescent current provide high efficiency over the output current load range, allowing the MP9840 to be used in a variety of step-down applications in automotive input environments and battery-powered applications.

Peak-current-mode operation provides fast transient response and eases loop stabilization. The excellent low dropout performance allows the MP9840 to be used in high duty cycle applications.

Full protection features include over-current protection (OCP), short-circuit protection (SCP), and thermal shutdown. An open-drain power good (PG) signal indicates when the output is within 10% of its nominal voltage.

The MP9840 is available in a space-saving QFN-16 (3mmx4mm) package.

FEATURES

• 2μA Low Shutdown Supply Current

• 14μA No-Load Quiescent Current

• Internal 125mΩ High-Side and 55mΩ Low-Side MOSFET

• 350kHz to 2.5MHz Programmable Switching Frequency

• Power Good (PG) Output

• External Soft Start (SS)

• 80ns Minimum On Time

• Selectable Forced CCM and AAM

• Hiccup Over-Current Protection (OCP)

• Available in a QFN-16 (3mmx4mm) Package

APPLICATIONS

• Automotive Systems

• Industrial Power Systems