MIC5249-3.3YMM

MIC5249-3.3YMM is a fixed 3.3 V low-dropout regulator (LDO) from Microchip/Micrel. It converts a higher input voltage to a stable 3.3 V output with protections and low quiescent current, suitable for battery-powered and compact electronics.
Key points
- Fixed output: +3.3 V
- Output current: up to ~150 mA (typical, depends on package and conditions)
- Low dropout: suitable for modest headroom between Vin and Vout
- Quiescent current: very low (important for battery apps)
- Protections: current limit and thermal shutdown; often includes safe-enabling features
- Package: YMM suffix indicates a compact SOT-23/SC-70-like small package
Usage notes
- Requires input and output capacitors (low ESR, per datasheet) close to the device
- Ensure Vin is sufficiently higher than 3.3 V (accounting for dropout)
- If an enable pin exists, drive it to enable the regulator
For precise electrical specs, pinout, capacitor values, and recommended layouts, consult the MIC5249-3.3YMM datasheet.

Here are common equivalents (3.3 V fixed LDOs with similar current):
- MIC5205-3.3
- MCP1700-33
- LP2985-33
- TLV1117-3.3
- AMS1117-3.3
- LM1117-3.3 (or LD1117V33)
Note: packaging, pinout, dropout, and max current vary. Verify footprint and electrical specs for your design.

MIC5249-3.3YMM features:
- Fixed 3.3V low-dropout regulator
- Up to 150 mA output current
- Low dropout voltage
- Very low quiescent current
- High PSRR with good line/load regulation
- Stable with ceramic output capacitors (low ESR)
- Protection: overcurrent/short-circuit and thermal shutdown
- Suitable input range (typically 2.3–5.5 V)
- Available in small YMM package for compact designs

5 pins. It is a fixed 3.3V LDO with an enable and a bypass pin. Pin functions:
- Vin: input supply
- GND: ground
- Vout: 3.3V output
- EN: enable/shutdown control
- BYP: bypass capacitor pin for noise reduction

Manufacturer: Microchip Technology (originally Micrel, Inc.).
What kind of company: A global semiconductor company that designs and manufactures analog, mixed-signal, and power-management ICs (including voltage regulators) and microcontrollers.

MIC5249-3.3YMM is a fixed 3.3V LDO regulator. Common applications:
- Power supply for microcontrollers, DSPs and other digital ICs in handheld/embedded systems
- Local regulation for RF modules (BLE/Wi‑Fi, ZigBee) and GPS receivers
- Sensors and MEMS devices (accelerometers, gyros, pressure sensors) needing a stable rail
- Audio and analog front-ends requiring clean 3.3V supply
- Battery-powered portable instruments and wearables
- Displays and I/O peripherals (I2C/SPI, LCD drivers) in compact boards
- Prototyping and space-constrained PCBs needing a small, efficient regulator

8-pin MSOP (Micro Small Outline Package) surface-mount package (MSOP-8).