Microchip MCP16321

Description

The MCP16321 is a highly integrated, high-efficiency,fixed frequency, synchronous step-down DC-DC converter in a 16-pin QFN package that operates from input voltages up to 24V. Integrated features include ahigh-side and low-side N-Channel switch, fixed frequency Peak Current Mode Control, internal compensation, peak current limit, VOUT overvoltageprotection and overtemperature protection. Minimal external components are necessary to develop a complete synchronous step-down DC-DC converter power supply.

High converter efficiency is achieved by integrating a high-speed, current limited, low resistance, high-side N-Channel MOSFET, as well as a high-speed, low resistance, low-side N-Channel MOSFET and associated drive circuitry. High switching frequency minimizes the size of the inductor and output capacitor,resulting in a small solution size.

The MCP16321 device can supply 1A/2A of continuous current while regulating the output voltage from 0.9V to 5V. A high-performance peak current mode architecture keeps the output voltage tightly regulated, even during input voltage steps and output current transient conditions that are common in power Supplies.

The regulator can be turned on and off with a logic level signal applied to the EN input. The EN input is internally pulled up to a 4.2V reference and is rated for a maximum of 6V. With EN low, typically 5 μA of current is consumed from the input, making the part ideal for power shedding and load distribution applications. The PG output is an open drain output pin used to interface with other components of the system, and can bepulled up to a maximum of 6V.

The output voltage can either be fixed at output voltages of 0.9V, 1.5V, 1.8V, 2.5V, 3.3V, 5V or adjustable using an external resistor divider. The MCP16321 is offered in a 3x3 QFN-16 surface mount package.

Features

• Up to 95% Typical Efficiency
• Input Voltage Range: 6.0V to 24V
• 1A Output Current (MCP16321)
• 2A Output Current (MCP16322)
• Fixed Output Voltages: 0.9V, 1.5V, 1.8V, 2.5V, 3.3V, 5V with 2% Output Voltage Accuracy
• Adjustable Version Output Voltage Range: 0.9V to 5V with 1.5% Reference Voltage Accuracy
• Integrated N-Channel High-Side Switch: 180 mΩ
• Integrated N-Channel Low-Side Switch: 120 mΩ
• 1 MHz Fixed Frequency
• Low Device Shutdown Current
• Peak Current Mode Control
• Internal Compensation
• Stable with Ceramic Capacitors
• Internal Soft-Start
• Cycle-by-Cycle Peak Current Limit
• Undervoltage Lockout (UVLO): 5.75V
• Overtemperature Protection
• VOUT Overvoltage Protection
• VOUT Voltage Supervisor Reported at the PG Pin
• Available Package: QFN-16 (3x3 mm)

Typical applications

• Wall Cube Regulation
• Medical and Health Care
• Automotive
• SLA Battery Powered Devices
• Distributed Power Supplies
• AC-DC Digital Control Power Source
• Set-Top Boxes
• 12V Industrial Input DC-DC Conversion
• PIC® /dsPIC® Microcontroller Bias Supply
• DSL Cable Modems
• Consumer
• Power Meters

More information

• Datasheet
• IC product information