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Microchip MCP16311

30V Input, 1A Output, High-Efficiency,Integrated Synchronous Switch Step-Down Regulator


TopologyOther Topology
Switching frequency425-575 kHz
IC revisionB


The MCP16311/2 is a compact, high-efficiency, fixed frequency, synchronous step-down DC-DC converter in a 8-pin MSOP, or 2 x 3 TDFN package that operates from input voltage sources up to 30V. Integrated features include a high-side and a low-side switch, fixed frequency Peak Current Mode Control, internal compensation, peak-current limit and overtemperatureprotection. The MCP16311/2 provides all the active functions for local DC-DC conversion, with fast transient response and accurate regulation.

High-converter efficiency is achieved by integrating the current-limited, low-resistance, high-speed lowside and high-side switches, and associated drive circuitry. The MCP16311 is capable of running in PWM/PFM mode. It switches in PFM mode for light load conditions and for large buck conversion ratios.This results in a higher efficiency over all load ranges.The MCP16312 is running in PWM mode-only, and is recommended for noise-sensitive applications.

The MCP16311/2 can supply up to 1A of continuous current while regulating the output voltage from 2V to 12V. An integrated, 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 systems.

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.

Output voltage is set with an external resistor divider. The MCP16311/2 is offered in a small MSOP-8 and 2 x 3 TDFN surface mount packages.


  • Up to 95% Efficiency
  • Input Voltage Range: 4.4V to 30V
  • 1A Output Current Capability
  • Output Voltage Range: 2.0V to 24V
  • Integrated N-Channel Low and High-SideSwitches:
  • 170m, Low Side
  • 300m, High Side
  • Stable Reference Voltage: 0.8V
  • Automatic Pulse Frequency Modulation/Pulse-Width Modulation (PFM/PWM) Operation(MCP16311):
  • PFM Operation Disabled (MCP16312)
  • PWM Operation: 500 kHz
  • Low Device Shutdown Current: 3 μA typical
  • Low Device Quiescent Current:
  • 44 μA (non-switching, PFM Mode)
  • Internal Compensation
  • Internal Soft-Start: 300 μs (EN low to high)
  • Peak Current Mode Control
  • Cycle-by-Cycle Peak Current Limit
  • Undervoltage Lockout (UVLO):
  • 4.1V typical to start
  • 3.6V typical to stop
  • Overtemperature Protection
  • Thermal Shutdown:
  • +150°C
  • +25°C Hysteresis

Typical applications

  • Local Point of Load Regulation
  • AC-DC Digital Control Bias
  • General Purpose DC-DC Conversion
  • PIC® /dsPIC® Microcontroller Bias Supply
  • 24V Industrial Input DC-DC Conversion
  • Networking Systems
  • Cable Modems
  • Automotive Battery Regulation
  • Distributed Power Supplies
  • Wall Transformer Regulation
  • Laptop Computers
  • Set-Top Boxes