MCP16323 18V Input, 3A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication Features Description Up to 95% Typical Efficiency The MCP16323 is a highly integrated, high-efficiency, fixed frequency, synchronous step-down DC-DC Input Voltage Range: 6.0V to 18V converter in a 16-pin QFN package that operates from 3A Output Current input voltages up to 18V. Integrated features include a Fixed Output Voltages: 0.9V, 1.5V, 1.8V, 2.5V, high-side and low-side N-Channel switch, fixed 3.3V, 5V with 2% Output Voltage Accuracy frequency Peak Current Mode Control, internal Adjustable Version Output Voltage Range: overvoltage compensation, peak current limit, V OUT 0.9V to 5V with 1.5% Reference Voltage Accuracy protection and overtemperature protection. Minimal Integrated N-Channel High-Side Switch: 180 m external components are necessary to develop a complete synchronous step-down DC-DC converter Integrated N-Channel Low-Side Switch: 120 m power supply. 1 MHz Fixed Frequency Low Device Shutdown Current High converter efficiency is achieved by integrating a high-speed, current limited, low resistance, high-side Peak Current Mode Control N-Channel MOSFET, as well as a high-speed, low- Internal Compensation resistance, low-side N-Channel MOSFET and Stable with Ceramic Capacitors associated drive circuitry. High switching frequency Internal Soft-Start minimizes the size of the inductor and output capacitor, Cycle-by-Cycle Peak Current Limit resulting in a small solution size. Under Voltage Lockout (UVLO): 5.75V The MCP16323 device can supply 3A of continuous Overtemperature Protection current while regulating the output voltage from 0.9V to 5V. A high-performance peak current mode V Overvoltage Protection OUT architecture keeps the output voltage tightly regulated, V Voltage Supervisor Reported at the PG Pin OUT even during input voltage steps and output current Available Package: QFN-16 (3x3 mm) transient conditions that are common in power supplies. Applications The regulator can be turned on and off with a logic level PIC /dsPIC Microcontroller Bias Supply signal applied to the EN input. The EN pin is internally pulled up to a 4.2V reference and is rated for a 12V Industrial Input DC-DC Conversion maximum of 6V. With EN low, typically 5 A of current Set-Top Boxes is consumed from the input, making the part ideal for DSL Cable Modems power shedding and load distribution applications. The Automotive PG output is an open drain output pin used to interface Wall Cube Regulation with other components of the system, and can be pulled up to a maximum of 6V. SLA Battery Powered Devices AC-DC Digital Control Power Source The output voltage can either be fixed at output Power Meters voltages of 0.9V, 1.5V, 1.8V, 2.5V, 3.3V, 5V or adjustable using an external resistor divider. The Consumer MCP16323 is offered in a 3x3 QFN-16 surface mount Medical and Health Care package. Distributed Power Supplies 2011 Microchip Technology Inc. DS22284A-page 1MCP16323 Package Type MCP16323 3x3 QFN* 16 15 14 13 SW SW 1 12 V 11 V 2 IN EP IN 17 BOOST V 3 10 IN S EN 4 9 GND 567 8 * Includes Exposed Thermal Pad (EP) see Table 3-1. Typical Applications Typical Application with Adjustable Output Voltage C BOOST 22nF L1 BOOST V OUT 4.7H 4.2V 3A VIN SW 6.0Vto18V V IN 36.5 k C OUT V FB 2x22F V OUT 10 k 10 k C IN EN 2x10F PG SGND PGND Typical Application with Fixed Output Voltage C BOOST 22nF L1 V OUT BOOST 4.7H 3.3V 3A V IN SW 6.0Vto18V V IN C OUT 2x22F VFB V OUT C IN 2x10F 10 k PG EN S P GND GND DS22284A-page 2 2011 Microchip Technology Inc. FB SW NC P GND NC P GND SW PG MCP16323 MCP16323