Microchip Technology MIC5317-1.2YM5-T5

Overview

MIC5317-1.2YM5-T5 from Microchip Technology is a high-performance 150 mA low-dropout linear regulator delivering a fixed 1.2 V output, operating from 2.5 V to 6.0 V input, with 155 mV dropout at full load, 29 μA quiescent current, and stable operation using only 1 μF ceramic output capacitance. It serves as a compact, low-noise power supply for space-constrained portable electronics requiring precise voltage regulation.

For engineers reviewing the MIC5317-1.2YM5-T5 datasheet, MIC5317-1.2YM5-T5 pinout, MIC5317-1.2YM5-T5 application, or MIC5317-1.2YM5-T5 equivalent, this page provides verified package mapping (SOT23-5), confirmed electrical parameters (±2% output accuracy, 70 dB PSRR, –40°C to +125°C junction range), thermal shutdown and current-limit protection, and validated alternative LDOs for USB dongles, battery-powered cameras, and embedded microcontroller core rails.

Technical Context

The MIC5317-1.2YM5-T5 implements a CMOS-based LDO architecture with active-high enable control, internal reference, and precision error amplifier feedback. Its design targets ultra-low quiescent current (29 μA typical) and fast transient response-critical for dynamic load applications like wireless LAN baseband ICs and USB peripheral SoCs.

It integrates thermal shutdown and foldback current limiting, operates across –40°C to +125°C junction temperature, and is optimized for stability with minimal 1 μF ceramic capacitors on both input and output-eliminating need for external compensation or large bulk capacitance.

Key Specifications

Pinout & Package

The MIC5317-1.2YM5-T5 uses the 5-lead SOT23-5 (M5) package: 2.9 mm × 1.6 mm × 1.1 mm body, e-pad exposed thermal pad connected to GND, RoHS-compliant matte tin finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700T-1202E/TT, MIC5317-1.2YM5-T5 adds active-high enable and lower dropout for battery longevity; versus TPS7A0512PDBVR, it offers better thermal performance in SOT23-5 but looser initial accuracy-making it optimal for cost-sensitive, thermally constrained 150 mA designs.

Availability

MIC5317-1.2YM5-T5 is available at Aetrix Electronics and suitable for USB dongles, wireless LAN modules, and industrial embedded controllers requiring stable component supply, consistent tape-and-reel packaging (3,000/reel), and long-term lifecycle support.

Supply support for MIC5317-1.2YM5-T5 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and industrial-grade qualification.

The MIC5317 product line delivers high-PSRR, low-IQ LDOs in ultra-compact packages for space- and power-constrained portable and embedded systems-designed specifically for USB, wireless, and battery-powered applications.

FAQ

What is the output voltage tolerance of the MIC5317-1.2YM5-T5 across temperature?

The MIC5317-1.2YM5-T5 guarantees ±2.0% output voltage accuracy at +25°C and ±3.0% over the full –40°C to +125°C junction temperature range. This is confirmed in the Electrical Characteristics table (DS20006195B, page 3), where variation from nominal VOUT is specified as –3.0% to +3.0% across temperature. The device maintains regulation within these bounds without external trimming or calibration, making MIC5317-1.2YM5-T5 suitable for core voltage rails where tight tolerance is required.

Does the MIC5317-1.2YM5-T5 require an external pull-up resistor on the EN pin?

No, the MIC5317-1.2YM5-T5 does not require an external pull-up resistor on the EN pin. Its enable input uses CMOS technology with defined VIH (≥1.2 V) and VIL (≤0.2 V) thresholds and draws only 0.01–1 μA leakage current. However, the datasheet explicitly warns against leaving EN floating, as it may cause indeterminate output state. A direct connection to VIN (for always-on) or a controlled GPIO is sufficient-MIC5317-1.2YM5-T5 contains no internal pull-up or pull-down.

Can the MIC5317-1.2YM5-T5 be used with Y5V ceramic capacitors?

No, Y5V dielectric capacitors are not recommended for use with the MIC5317-1.2YM5-T5. Per Section 4.2 of the datasheet, Y5V capacitors lose up to 60% of rated capacitance over temperature and exhibit high voltage coefficient, risking instability. The MIC5317-1.2YM5-T5 is optimized for X5R or X7R ceramics (e.g., GRM155R61A105KE15D), which maintain ≥85% capacitance across –40°C to +85°C. Using Y5V may cause oscillation or poor transient response-MIC5317-1.2YM5-T5 requires stable 1 μF minimum at operating conditions.

What is the thermal resistance (θJA) of the MIC5317-1.2YM5-T5 in its SOT23-5 package?

The MIC5317-1.2YM5-T5 in the SOT23-5 (M5) package has a junction-to-ambient thermal resistance (θJA) of 253°C/W, as specified in the Temperature Specifications table (DS20006195B, page 4). This value assumes standard JEDEC 2-layer board conditions. With 150 mA load and 0.12 W dissipation (e.g., VIN = 3.6 V, VOUT = 2.8 V), the maximum allowable ambient temperature is ~96°C-MIC5317-1.2YM5-T5 achieves this via its exposed thermal pad, which must be soldered to a solid GND plane for effective heat transfer.

Is the MIC5317-1.2YM5-T5 suitable for RF transmitter power supply applications?

No, the MIC5317-1.2YM5-T5 is explicitly stated as "not suitable for RF transmitter systems" in Section 4.0 of the datasheet (DS20006195B, page 9). While it offers high PSRR (70 dB) and low noise (200 μVRMS), its architecture lacks the ultra-low phase noise and spurious-free performance required for RF PA biasing. It is qualified for RF receiver front-ends, baseband, and digital logic-but MIC5317-1.2YM5-T5 must not be used to power RF power amplifiers or synthesizer VCOs.