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IC-Hersteller Microchip

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Microchip MCP1661

High-Voltage Integrated Switch PWM Boost Regulator with UVLO

Details

Topologie Aufwärtswandler
Eingangsspannung 3-4.2 V
Ausgang 1 3.3 V / 0.25 A
IC-Revision B

Beschreibung

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.

Eigenschaften

  • 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

Typische Anwendungen

  • Portable Medical Equipment
  • LCD Bias Supply for Portable Applications
  • Single-Cell Li-Ion to 5V, 12V or 24V Converters
  • Two and Three-Cell Alkaline, Lithium Ultimate and NiMH/NiCd Portable Products
  • Hand-Held Instruments
  • Camera Phone Flash
  • Single-Cell Li-Ion to 3.0V or 3.3V SEPIC Applications

Weiterführende Informationen

Artikeldaten

Artikel Nr. Daten­blatt Downloads Produktserie L1
(µH)
L2
(µH)
IR 1
(A)
IR 2
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres 1
(MHz)
Typ Muster
744878004
STE ALT EAG CAD LTS PSP IGS CAD WE-DD SMT-Doppeldrossel 4.7 4.7 1.3 1.3 3 0.065 0.065 0.075 0.075 46 Gerade
Artikel Nr. Daten­blatt
744878004
Muster
Artikel Nr. Daten­blatt Downloads Produktserie L1
(µH)
L2
(µH)
IR 1
(A)
IR 2
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC2 typ
(Ω)
RDC1 max
(Ω)
RDC2 max
(Ω)
fres 1
(MHz)
Typ Muster