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MIC5205-3.3YM5-TR

3.3V 150mA ultra-low-noise LDO, 165mV dropout, 30uVrms noise, SOT-23-5

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Manufacturer Part：

MIC5205-3.3YM5-TR

Package：

SOT-23-5 (2.9 x 1.6 x 1.1mm)

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Description

Product Overview

The MIC5205-3.3YM5-TR from Microchip Technology is a 3.3V fixed-output ultra-low-noise LDO regulator with 150mA output capability. It features very low dropout voltage of 165mV at 150mA and ultra-low noise of 30uVrms without external capacitor in SOT-23-5 package.

Key Specifications

Output Voltage 3.3V (fixed)
Output Current 150 mA (max)
Input Voltage Range 3.5V to 16V
Dropout Voltage 165 mV at 150mA
Output Noise 30 uVrms (10Hz-100kHz, CNR=0.01uF)
PSRR 75 dB at 1kHz
Quiescent Current 1.5 mA (ground current)
Shutdown Current 0.01 uA (typical)
Operating Temperature -40 to 125 C
Package SOT-23-5

Features

  • Ultra-low output noise without bypass capacitor (30uVrms)
  • Very low 165mV dropout at full 150mA load

Applications

  • RF and wireless module power supplies
  • Audio and video circuit regulation
  • Battery-powered noise-sensitive devices
  • PLL and VCO clean power
  • Portable instrumentation

The MIC5205-3.3YM5-TR from Microchip Technology is an ultra-low-noise, low-dropout linear regulator optimized for noise-sensitive applications. Providing a fixed 3.3V output at up to 150mA, it achieves only 30uVrms output noise with a noise reduction bypass capacitor, making it ideal for RF, audio, and precision analog circuits. The 165mV dropout voltage at full load enables efficient operation from 3.5V input. A logic-controlled enable pin allows shutdown to 0.01uA for power management in battery-operated systems.

The MIC5205-3.3YM5-TR operates as a PNP-based LDO linear regulator optimized for low noise. **Pass Element**: A PNP pass transistor enables low dropout operation (165mV at 150mA), significantly lower than NPN-based LDOs. The dropout voltage scales with output current. **Noise Reduction**: A noise reduction (NR) pin connects to an internal voltage reference through a high-value resistor. Adding an external capacitor (0.01uF) from NR to GND filters reference noise, dramatically reducing output noise to 30uVrms. This is the primary noise reduction mechanism unique to the MIC5205 family. **Error Amplifier**: A high-gain error amplifier compares the output voltage against the filtered reference. The amplifier bandwidth and compensation are designed for stability with ceramic output capacitors as small as 1uF. **Enable Control**: The EN pin provides logic-controlled shutdown. When EN is low, the output is disabled and ground current drops to 0.01uA, making it suitable for power gating in battery systems. **Protection**: Current limiting protects against overload. Thermal shutdown disables the output when junction temperature exceeds approximately 160C.

Pin Name Description
1 IN Input supply voltage (3.5V to 16V)
2 GND Ground
3 EN Enable input (high=on, low=shutdown)
4 NR/BYP Noise reduction bypass (connect 0.01uF cap to GND)
5 OUT Regulated 3.3V output
  • RF Power: Clean 3.3V supply for WiFi/BLE transceivers and low-noise amplifiers
  • Audio Circuits: Ultra-low-noise power for ADCs, DACs, and headphone amplifiers
  • PLL/VCO: Noise-free supply for frequency synthesizers and voltage-controlled oscillators
  • Portable Devices: Battery-efficient 3.3V rail with enable control for power sequencing
  • Sensor Power: Low-noise supply for precision analog sensors and instrumentation amplifiers
Model Manufacturer Key Difference
MIC5205-5.0YM5-TR Microchip 5.0V fixed output version
TLV70033DDCR TI 3.3V, 200mA, 50uA Iq, SOT-23-5
AP2112K-3.3 Diodes Inc 3.3V, 600mA, 250mV dropout, SOT-23-5
LT1761ES5-3.3#TRMPBF ADI 3.3V, 100mA, 20uVrms noise, SOT-23-5
TC1185-3.3VCT713 Microchip 3.3V, 150mA, SOT-23-5, similar family
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