High-Voltage Integrated Switch PWM Boost Regulator with UVLO

Topologie: SEPIC
Eingangsspannung (min.): 2.40 V
Eingangsspannung (max.): 5.50 V
Ausgang 1: 3.30 V / 0.450 A
Ausgang 2: 12.00 V / 0.280 A

Erstveröffentlichung am 01.06.2014, Version B vom


The MCP1661 device is a compact, high-efficiency,fixed-frequency, non-synchronous step-up DC-DC converter which integrates a 36V, 800 m NMOS switch. It provides a space-efficient high-voltage step-up power supply solution for applications powered by either two-cell or three-cell alkaline, Ultimate Lithium,NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.The integrated switch is protected by the 1.3A cycle-by-cycle inductor peak current limit operation. There is an output overvoltage protection which turns off switching in case the feedback resistors are accidentally disconnected or the feedback pin is short-circuited to GND.Low-voltage technology allows the regulator to start-up without high inrush current or output voltage overshoot from a low-voltage input. The device features a UVLO which avoids start-up and operation with low inputs or discharged batteries for two cell-powered applications.For standby applications (EN = GND), the device stops switching, enters Sleep mode and consumes 200 nA (typical) of input current.MCP1661 is easy to use and allows creating classic boost, SEPIC or flyback DC-DC converters within a small Printed Circuit Board (PCB) area. Allcompensation and protection circuitry is integrated to minimize the number of external components. Ceramic input and output capacitors are used.


  • 36V, 800m Integrated Switch• Up to 92% Efficiency• High Output Voltage Range: up to 32V• 1.3A Peak Input Current Limit:
  • IOUT > 200 mA @ 5.0V VIN, 12V VOUT
  • IOUT > 125 mA @ 3.3V VIN, 12V VOUT
  • IOUT > 100 mA @ 4.2V VIN, 24V VOUT• Input Voltage Range: 2.4V to 5.5V• Undervoltage Lockout (UVLO):
  • UVLO@VIN Rising: 2.3V, typical
  • UVLO@VIN Falling: 1.85V, typical• No Load Input Current: 250 μA, typical• Sleep mode with 200 nA Typical Quiescent Current• PWM Operation with Skip mode: 500 kHz• Feedback Voltage Reference: VFB = 1.227V• Cycle-by-Cycle Current Limiting• Internal Compensation• Inrush Current Limiting and Internal Soft Start• Output Overvoltage Protection (OVP) in the event of:
  • Feedback pin shorted to GND
  • Disconnected feedback divider• Overtemperature Protection• Easily Configurable for SEPIC or Flyback Topologies• Available Packages:
  • 5-Lead SOT-23
  • 8-Lead 2x3 TDFN


  Artikel Nr. SPEC Produktserie L1
IR 1
IR 2
RDC1 typ
RDC2 typ
RDC1 max
RDC2 max
fres 1
744878004 PDF WE-DD SMT-Doppeldrossel 4.7 4.7 1.3 1.3 3 0.065 0.065 0.075 0.075 46

Weitere Anwendungen und Artikel von Würth Elektronik zu diesem IC

  • MCP1661
    Topologie: Boost, Eingangsspannung (min.): 3.00 V, Eingangsspannung (max.): 4.20 V, Ausgang 1: 24.00 V / 0.050 A, Ausgang 2: 24.00 V / 0.120 A
  • MCP1661
    Topologie: Boost, Eingangsspannung (min.): 2.40 V, Eingangsspannung (max.): 3.00 V, Ausgang 1: 12.00 V / 0.080 A, Ausgang 2: 12.00 V / 0.050 A, Ausgang 3: 12.00 V / 0.120 A
  • MCP1661
    Topologie: Boost, Eingangsspannung (min.): 3.00 V, Eingangsspannung (max.): 4.20 V, Ausgang 1: 3.30 V / 0.250 A