MIC5249-3.3YMM

MIC5249-3.3YMM is a fixed-output low-dropout regulator (LDO) from Microchip/Micrel that provides a stable 3.3 V rail for portable electronics. It is designed to simplify power for MCUs, sensors, and peripherals without external resistor networks.
Key points:
- Fixed output: 3.3 V
- Low dropout: only a few hundred millivolts at moderate load
- Low quiescent current with good line/load regulation
- Built-in protections (overcurrent/thermal shutdown)
- External components: minimal—typically an input capacitor and an output capacitor with appropriate ESR; enable pin allows shutdown when needed
Package: YMM indicates a compact surface-mount package (small form factor; pin count varies by revision).
Usage overview:
- Vin → regulated 3.3 Vout
- GND to ground
- Place recommended decoupling caps near pins
- Use EN/SHDN as needed to enable/disable
Applications: battery-powered devices, microcontrollers, sensors, and other 3.3 V rails.
Note: For exact electrical specs (Vin range, dropout at load, quiescent current, ESR requirements, and pinout), consult the latest MIC5249 datasheet.

Here are the key features of MIC5249-3.3YMM:
- Fixed 3.3 V output low-dropout (LDO) regulator
- Max ~150 mA output current
- Very low quiescent current
- Low dropout voltage for efficient regulation
- Enable/Shutdown input
- Overcurrent protection and thermal shutdown
- Stable with ceramic output capacitors
- Low-noise operation with good PSRR
- Packaging: 5-pin SOT-23 (YMM) RoHS-compliant

The MIC5249-3.3YMM is in a SOT-23-5 (SC-70-5) small-outline package (5 pins).

Pin count: 5 pins.
Function: Fixed 3.3 V low-dropout regulator (LDO) with enable control and a bypass option. It takes VIN and provides VOUT = 3.3 V, with a ground pin and an EN (enable) input; BYP (bypass) pin available for improved noise performance. Package: typical SOT-23-5 (SC‑70-5) variant. Pinout: VIN, VOUT, GND, EN, BYP.

- Manufacturer: Microchip Technology (Micrel’s products are now part of Microchip; MIC5249-3.3YMM originated from Micrel).
- Kind of company: A semiconductor company that designs and manufactures integrated circuits, including analog/mixed-signal ICs and microcontrollers.

Fixed 3.3V low-dropout regulator for portable or battery-powered electronics. Provides a stable 3.3V rail for MCUs, memories, sensors, analog front-ends, RF/transceivers, and other mixed-signal ICs. Features low quiescent current and an enable pin for power saving, making it suitable for IoT nodes, wearables, handheld instruments, and any 3.3V subsystem powered from a higher voltage.

Equivalent 3.3V fixed LDO regulators (≈100–200 mA) in SOT-23-5 include: TI TLV70033, TI TPS73633, Analog Devices ADP3333, ST LP5907-33, and ST LD39050M33R. Verify pinout and current specs in their datasheets before substituting.