Description

The MCP16367/8/9 family consists of highly integrated, high-efficiency, fixed-frequency, step-down DC-DC converters available in a compact 8-lead, 3 mm x 3 mm VDFN package supporting input voltages up to 48V. Key integrated features include a high-side switch, fixed-frequency Peak Current Mode Control, Internal Compensation, Power Good indication, Peak Current Limit and Overtemperature Protection. These devices provide all necessary functions for local DC-DC conversion, delivering fast transient response and precise regulation.

High efficiency conversion is achieved by integrating the current-limited, high-speed N-Channel MOSFET and associated drive circuitry. The high switching frequency minimizes the size of the external filtering components, enabling a compact solution.

The MCP16367/8/9 can supply 400 mA of continuous current, with output voltage from 2.0V to 24V. An integrated, high-performance peak current mode control architecture keeps the output voltage tightly regulated, even during input voltage steps and output current transient conditions that are common in power systems.

The MCP16367 is capable of running in PFM/PWM mode. It switches in PFM mode for light load conditions and for large step-down conversion ratios. This results in a higher efficiency over all load ranges.

By comparison, the MCP16368 runs in PWM-only mode and is recommended for applications where the low-frequency component associated with the PFM mode of operation is not desirable.

Besides the two aforementioned options, the MCP16369 is designed for EMI-constrained applications where reduced peak emissions are required. This is achieved by sweeping the switching frequency over a 10% range above the 2.2 MHz nominal value.

Output voltage is set with an external resistor divider. The Power Good output pin transitions from logic-low to logic-high (via an external pull-up resistor) when the output voltage is within 93% of the nominal set point. The EN input is used to turn the device on and off. While off, only a few micro-amps of current are consumed from the input.

The MCP16367/8/9 is offered in a space-saving, 8-lead 3 mm x 3 mm VDFN wettable flanks surface-mount package.

The MCP16367/8/9 also passes automotive AEC-Q100 reliability testing.