MIC2571

Micrel's MIC2571 is a micropower boost switching regulator that operates from one alkaline, nickel-metal-hydride cell, or lithium cell.

The MIC2571 accepts a positive input voltage between 0.9V and 15V. Its typical no-load supply current is 120µA.

The MIC2571 is available in selectable fixed output or adjustable output versions. The MIC2571-1 can be configured for 2.85V, 3.3V, or 5V by connecting one of three separate feedback pins to the output. The MIC2571-2 can be configured for an output voltage ranging between its input voltage and 36V, using an external resistor network.

The MIC2571 has a fixed switching frequency of 20kHz. An external SYNC connection allows the switching frequency to be synchronized to an external signal.

The MIC2571 requires only four components (diode, inductor, input capacitor and output capacitor) to implement a boost regulator. A complete regulator can be constructed in a 0.3 in² area.

All versions are available in an 8-lead MSOP with an operating range from -40°C to +85°C.

Features
  • Operates from a single-cell supply
  • 0.9V to 15V operation
  • 120µA typical quiescent current
  • Complete regulator fits 0.3 in² area
  • 2.85V/3.3V/5V selectable output voltage (MIC2571-1)
  • Adjustable output up to 36V (MIC2571-2)
  • 1A current limited pass element
  • Frequency synchronization input
  • 8-lead MSOP package
Parameter
Parameter Name Value Value
Regulator Type Step Up (Boost) Step Up (Boost)
Input Voltage Range Min (V) 0.9 0.9
Input Voltage Range Max (V) 15 15
Output Voltage Range Min (V) 2.85 2.85
Output Voltage Range Max (V) 36 36
Switching Frequency (kHz) 20 20
Operating Temp Range -40 to 85 -40 to 85
Vfb (V) 0.22 0.22
Duty Cycle Max (%) 67 67
SHUTDOWN Current (µA) (Typ) 120 120
Switch current (A) typ 1.1 1.1
Documents
MIC2571 - Single-Cell Switching RegulatorData Sheets11/05/2015569KB
Micrel AN 108 - Universal Serial Bus Power ManagementAppNote10/02/2015125KB
Micrel AN 21 - Dual Current-Limiting Switch for USB ApplicationsAppNote10/01/201536KB
RoHS Information
PartNumberDeviceWeightShippingWeightLeadCountPackageTypePackageWidthSolderCompositionJEDECIndicatorRoHSChinaEFUP
MIC2571-2YMM0.0251000.1246008MSOP3x3x1.0mmNiPdAue4
MIC2571-2YMM-TR0.0251000.3347008MSOP3x3x1.0mmNiPdAue4
MIC2571-1YMM0.0251000.1246008MSOP3x3x1.0mmNiPdAue4
MIC2571-1YMM-TR0.0251000.3347008MSOP3x3x1.0mmNiPdAue4
MIC2571 - Single-Cell Switching Regulator MIC2571
Micrel AN 108 MIC2595
Micrel AN 21 MIC2595