2.0 MHz, 500 mA Synchronous Buck Regulator

Topologie: Buck
Eingangsspannung (min.): 2.70 V
Eingangsspannung (max.): 4.50 V
Schaltfrequenz (min.): 1500.00 kHz
Schaltfrequenz (max.): 2800.00 kHz
Ausgang 1: 1.80 V / 0.500 A

Erstveröffentlichung am 01.10.2012, Version B vom


The MCP1603/B/L is a high-efficiency, fully-integrated 500 mA synchronous buck regulator whose 2.7V to 5.5V input voltage range makes it ideally suited for applications powered from 1-cell Li-Ion or 2-cell/3-cell NiMH/NiCd batteries.At heavy loads, the MCP1603/B/L operates in the 2.0 MHz fixed frequency pulse-width modulation (PWM) mode, which provides a low noise, low-output ripple, small-size solution. When the load is reduced to light levels, the MCP1603/L automatically changesoperation to a Pulse Frequency Modulation (PFM)mode to minimize quiescent current draw from thebattery. No intervention is necessary for a smoothtransition from one mode to another. These two modesof operation allow the MCP1603/L to achieve thehighest efficiency over the entire operating currentrange.The MCP1603B device disables the PFM modeswitching, and operates only in normal PWM modeover the entire load range (without skipping).MCP1603B is for applications that cannot tolerate thelow-frequency output ripple associated with PFMswitching.The MCP1603/B/L family is available with either anadjustable or fixed-output voltage. The available fixedoutput voltage options for MCP1603/L are 1.2V, 1.5V,1.8V, 2.5V and 3.3V, and for MCP1603B are 1.8 and3.3V. When a fixed option is used, only three additionalsmall external components are needed to form acomplete solution. Couple this with the low profile,small-foot print packages and the entire systemsolution is achieved with minimal size.Additional protection features include: UVLO,overtemperature and overcurrent protection


  • Over 90% Typical Efficiency
  • Output Current Up To 500 mA
  • Low PFM Quiescent Current = 45 μA, typical(MCP1603/L)
  • Low Shutdown Current = 0.1 μA, typical
  • Adjustable Output Voltage:• 0.8V to 4.5V
  • Fixed Output Voltage:• 1.2V, 1.5V, 1.8V, 2.5V, 3.3V (MCP1603/L)• 1.8V, 3.3V (MCP1603B)
  • 2.0 MHz Fixed-Frequency PWM (Heavy Load)
  • Automatic PWM-to-PFM Mode Transition(MCP1603/L)
  • PWM Mode Only Option (MCP1603B)
  • 100% Duty Cycle Operation
  • Internally Compensated
  • Undervoltage Lockout (UVLO)
  • Overtemperature Protection
  • Space Saving Packages:• 5-Lead TSOT, Two Pinout Types (MCP1603/L)• 8-Lead 2 x 3 DFN


  Artikel Nr. SPEC Produktserie L
IR 1
RDC typ.
RDC max.
RDC1 typ
RDC1 max.
fres 1
744025004 PDF WE-TPC SMT-Speicherdrossel 4.7 4.7 1.35 1.35 1.7 1.7 100 120 100 120 84 84
744031004 PDF WE-TPC SMT-Speicherdrossel 4.7 4.7 1.2 1.2 0.9 0.9 90 105 90 105 75 75
744030004 PDF WE-TPC SMT-Speicherdrossel 4.7 4.7 0.48 0.48 0.5 0.5 252 290 252 290 100 100

Weitere Anwendungen und Artikel von Würth Elektronik zu diesem IC

  • MCP1603B
    Topologie: Buck, Eingangsspannung (min.): 2.70 V, Eingangsspannung (max.): 5.50 V, Schaltfrequenz (min.): 1500.00 kHz, Schaltfrequenz (max.): 2800.00 kHz, Ausgang 1: 3.30 V / 0.500 A, Ausgang 2: 4.50 V / 0.500 A, Ausgang 3: 1.80 V / 0.500 A