MCP16331 High-Voltage Input Integrated Switch Step-Down Regulator Features General Description Up to 96% Efficiency The MCP16331 is a highly integrated, high-efficiency, Input Voltage Range: 4.4V to 50V fixed frequency, step-down DC-DC converter in a popular Output Voltage Range: 2.0V to 24V 6-pin SOT-23 or 8-pin 2x3 TDFN package that operates from input voltage sources up to 50V. Integrated features 2% Output Voltage Accuracy include a high-side switch, fixed frequency Peak Current- Qualification: AEC-Q100 Rev. G, Grade 1 Mode control, internal compensation, peak current limit (-40C to 125C) and overtemperature protection. Minimal external com- Integrated N-Channel Buck Switch: 600 m ponents are necessary to develop a complete step-down Minimum 500 mA Output Current Over All Input DC-DC converter power supply. Voltage Ranges (see Figure 2-9 for Maximum High converter efficiency is achieved by integrating the Output Current vs. V ) IN current-limited, low-resistance, high-speed N-Channel - Up to 1.2A output current at 3.3V and MOSFET and associated drive circuitry. High switching 5V V , V > 12V, SOT-23 package at OUT IN frequency minimizes the size of external filtering +25C ambient temperature components, resulting in a small solution size. - Up to 0.8A output current at 12V V , OUT The MCP16331 can supply 500 mA of continuous V > 18V, SOT-23 package at IN current while regulating the output voltage from 2.0V to +25C ambient temperature 24V. An integrated, high-performance Peak Current- 500 kHz Fixed Frequency Mode architecture keeps the output voltage tightly regu- Adjustable Output Voltage lated, even during input voltage steps and output current Low Device Shutdown Current transient conditions that are common in power systems. Peak Current Mode Control The EN input is used to turn the device on and off. Internal Compensation While off, only a few A of current are consumed from Stable with Ceramic Capacitors the input for power shedding and load distribution Internal Soft Start applications. This pin is internally pulled up, so the Internal Pull-up on EN device will start, even if the EN pin is left floating. Cycle-by-Cycle Peak Current Limit Output voltage is set with an external resistor divider. Undervoltage Lockout (UVLO): 4.1V to Start The MCP16331 is offered in a space-saving 6-lead 3.6V to Stop SOT-23 and 8-lead 2x3 TDFN surface mount package. Overtemperature Protection Available Package: 6-Lead SOT-23, Package Type 8-Lead 2x3 TDFN MCP16331 6-Lead SOT-23 Applications BOOST 1 6 SW PIC MCU/dsPIC DSC Microcontroller Bias Supply GND 2 5 V IN 48V, 24V and 12V Industrial Input DC-DC Conversion V 3 4 EN FB Set-Top Boxes (STB) DSL Cable Modems MCP16331 Automotive 8-Lead 2x3 TDFN* AC/DC Adapters V SW 1 8 IN SLA Battery-Powered Devices EN 2 7 BOOST EP AC-DC Digital Control Power Source 9 V Power Meters NC 3 6 FB Consumer NC 4 5 GND Medical and Health Care *Includes Exposed Thermal Pad (EP) see Table 3-1. Distributed Power Supplies 2014-2016 Microchip Technology Inc. DS20005308C-page 1MCP16331 Typical Applications 1N4148 C BOOST V OUT L 1 100 nF BOOST V 15 H 3.3V at 500 mA IN SW 4.5V to 50V 100V V C IN OUT Schottky 2 X10 F C Diode IN EN 2x10 F 20 pF 31.6 k Optional V FB GND 10 k 1N4148 C BOOST V L OUT 1 100 nF BOOST 22 H 5.0V at 500 mA V IN SW 6.0V to 50V C V 100V OUT IN Schottky 2 X10 F Diode C IN 20 pF EN 52.3 k 2x10 F Optional V FB GND 10 k Note: EN has an internal pull-up, so the device will start even if the EN pin is left floating. 100 V =5V OUT 90 80 V =3.3V OUT 70 60 50 40 30 20 10 V =12V IN 0 10 100 1000 Output Current (mA) DS20005308C-page 2 2014-2016 Microchip Technology Inc. Efficiency (%)