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Microchip MCP16251

Low Quiescent Current, PFM/PWM Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option


TopologyBoost Converter
Input voltage1.8-5.5 V
Output 13.3 V / 0.08 A
IC revisionA


The MCP16251/2 is a compact, high-efficiency, fixed frequency, synchronous step-up DC-DC converter. This family of devices provides an easy-to-use power supply solution for applications powered by either one-cell, two-cell or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.

A low-voltage technology allows the regulator to start up without high inrush current or output voltage overshoot from a low voltage input. High efficiency is accomplished by integrating the low-resistance N-Channel boost switch and synchronous P-Channel switch. All compensation and protection circuitry are integrated to minimize external components. MCP16251/2 operates and consumes less than 14 μA from battery, while operating at no load (VOUT = 3.3V, VIN = 1.5V). The devices provide a true disconnect from input to output (MCP16251) or an input-to-output bypass (MCP16252), while in shutdown (EN = GND). Both options consume less than 0.6 μA from battery.

Output voltage is set by a small external resistor divider. Two package options, SOT-23-6 and 2 x 3 TDFN-8, are available


  • Up to 96% Typical Efficiency
  • 650mA Typical Peak Input Current Limit:
  • IOUT > 100 mA @ 3.3V VOUT, 1.2V VIN
  • IOUT > 250 mA @ 3.3V VOUT, 2.4V VIN
  • IOUT > 225 mA @ 5.0V VOUT, 3.3V VIN
  • Low Device Quiescent Current:
  • Output Quiescent Current: < 4 μA typical,device is not switching (VOUT > VIN, excluding feedback divider current)
  • Input Sleep Current: 1 μA
  • No Load Input Current: 14 μA typical
  • Shutdown Current: 0.6 μA typical
  • Low Start-up Voltage: 0.82V, 1 mA load
  • Low Operating Input Voltage: down to 0.35V
  • Adjustable Output Voltage Range: 1.8V to 5.5V
  • Maximum Input Voltage  VOUT < 5.5V
  • Automatic PFM/PWM Operation:
  • PWM Operation: 500 kHz
  • PFM Output Ripple: 150 mV typical
  • Feedback voltage: 1.23V
  • Internal Synchronous Rectifier
  • Internal Compensation
  • Inrush Current Limiting and Internal Soft Start (1.5 ms typical)
  • Selectable, Logic Controlled, Shutdown States:
  • True Load Disconnect Option (MCP16251)
  • Input to Output Bypass Option (MCP16252)
  • Anti-Ringing Control
  • Overtemperature Protection
  • Available Packages:
  • SOT-23-6
  • 2x 3 8-Lead TDFN

Typical applications

  • Solar Cell Applications
  • Personal Care and Medical Products
  • Remote controllers, Portable Instruments
  • •+3.3V to +5.0V Distributed Power Supply
  • One, Two and Three Cell Alkaline and NiMH/NiCd Portable Products
  • Smartphones, MP3 Players, Digital Cameras
  • Bias for Status LEDs
  • Wireless Sensors
  • Bluetooth Headsets