MCP16361/2/3 48V Input, 3A Output, 2.2 MHz Switching Frequency, Integrated Switch Step-Down Regulator General Description Features The MCP16361/2/3 family of devices are highly Input Voltage Range: 4.0V to 48V integrated, high-efficiency, fixed-frequency, step-down Adjustable Output Voltage Range: 2.0V to 24V DC-DC converters in a compact 8-lead 3x3 mm VDF N Integrated N-Channel Buck Switch: 100 m package that operates from input voltage sources up to 3A Output Current 48V. Integrated features include a high-side switch, 2.2 MHz Fixed Frequency fixed-frequency Peak Current Mode Control, Internal Compensation, Power Good, Peak Current Limit and Shutdown Current: 5 A typical Overtemperature Protection. The MCP16361/2/3 Quiescent Current: 18 A typical (not switching) provides all the active functions for local DC-DC Device Selectable Switching Mode conversion, with fast transient response and accurate - Automatic Pulse Frequency Modulation/ regulation. Pulse Width Modulation (PFM/PWM) High efficiency conversion is achieved by integrating Operation - MCP16361 the current-limited, low-resistance, high-speed - PWM only Mode of Operation - MCP16362 N-Channel MOSFET and associated drive circuitry. - PWM only Mode of Operation with Switching High switching frequency minimizes the size of external Frequency Dithering for EMI constrained filtering components resulting in a small size solution. applications - MCP16363 The MCP16361/2/3 can supply 3A of continuous Power Good Output current while regulating the output voltage from 2.0V to Undervoltage Lockout (UVLO) 24V. An integrated, high-performance peak current mode architecture keeps the output voltage tightly Peak Current Mode Control regulated, even during input voltage steps and output Internal Compensation current transient conditions that are common in power Internal Soft-Start systems. Internal Bootstrap Diode The MCP16361 is capable of running in PFM/PWM Cycle-by-Cycle Peak Current Limit mode. It switches in PFM mode for light load conditions Overtemperature Protection and for large buck conversion ratios. This results in a Available Package: 8-lead 3x3 mm wettable higher efficiency over all load ranges. flanks VDFN (see Package Type) By comparison, the MCP16362 runs in PWM-only Passes Automotive AEC-Q100 Reliability Testing mode, and is recommended for applications in which the low-frequency component associated with PFM Applications mode of operation is not desirable. Besides the two aforementioned options, the Automotive DC/DC and 48V Systems MCP16363 is designed for EMI constrained Microcontroller Bias Supply applications where reduced peak emissions are 24V Industrial Input DC-DC Conversion required. This is achieved by sweeping the switching Set-Top Boxes, DSL Cable Modems frequency over a 10% range above the 2.2 MHz nominal value. Wall Cube Regulation Output voltage is set with an external resistor divider. SLA Battery-Powered Devices The Power Good output pin will go from logic low to AC-DC Digital Control Power Sources logic high (through an external pull-up resistor) once Power Meters the output voltage is within 93% of the nominal set Medical and Health Care point. The EN input is used to turn the device on and Distributed Power Supplies off. While off, only a few micro-amps of current are consumed from the input. The MCP16361/2/3 is offered in a space-saving 8-lead 3x3 mm VDFN wettable flanks surface mount package. The MCP16361/2/3 also passes automotive AEC- Q100 reliability testing. 2020-2021 Microchip Technology Inc. DS20006481B-page 1MCP16361/2/3 Package Type MCP16361/2/3 8-Lead 3x3 VDFN (Top View) VIN 1 8 SW 2 7 BOOST EN EP 3 6 BD FB 4 5 PG GND * Includes Exposed Thermal Pad (EP) see Table 4-1. Functional Block Diagram VIN BD BG C IN V REF REG Boost Pre BOOST Charge V OUT OTEMP SS C BOOST V REF 2.2 MHz OSC L V OUT SW R S HS TOP + Drive Amp - FB Schottky PWM - Comp Diode Latch + C OUT R R Precharge COMP BOT R Overtemp C UVLO COMP + CS V OUT PFM + R SENSE CTR Slope V REF Comp PG + EN SHDN all blocks - 0.93 x V REF + GND - FB DS20006481B-page 2 2020-2021 Microchip Technology Inc.