Microchip Technology MIC5317-1.8YM5-T5

Overview

MIC5317-1.8YM5-T5 from Microchip Technology is a high-performance 150 mA low-dropout linear regulator in a 5-lead SOT23-5 package, delivering a fixed 1.8 V output with ±2% initial accuracy across –40°C to +125°C. It operates from 2.5 V to 6.0 V input, achieves 155 mV dropout at full load, and maintains stability with only 1 μF ceramic output capacitance-ideal for space-constrained USB dongles and battery-powered microcontrollers.

For engineers reviewing the MIC5317-1.8YM5-T5 datasheet, MIC5317-1.8YM5-T5 pinout, MIC5317-1.8YM5-T5 application, or MIC5317-1.8YM5-T5 equivalent, key selection criteria include its 29 μA quiescent current, 70 dB PSRR at low frequencies, thermal shutdown protection, and active-high enable functionality enabling zero-off-mode current draw.

Technical Context

The MIC5317-1.8YM5-T5 implements a CMOS-based LDO architecture with internal reference and error amplifier driving a PMOS pass transistor. Its control loop is optimized for fast transient response under dynamic load steps up to 150 mA, supported by stable operation with 1 μF ceramic capacitors on both input and output.

It features an active-high enable input (EN) that fully disables the regulator into sub-1 μA shutdown current, and includes integrated thermal shutdown and foldback current limiting-no external components required for basic fault protection. The device is not rated for RF transmitter applications per official specification.

Key Specifications

Pinout & Package

Package: 5-Lead SOT23-5 (M5), RoHS-compliant, 2.9 mm × 1.6 mm × 1.1 mm body, exposed pad for thermal enhancement (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1802E/TO and XC6206P182MR-G, the MIC5317-1.8YM5-T5 offers superior PSRR (70 dB vs. ≤65 dB), integrated enable with zero-off current, and tighter output accuracy - making it optimal for noise-sensitive, battery-conscious designs requiring precise voltage control and dynamic power management.

Availability

MIC5317-1.8YM5-T5 is available at Aetrix Electronics and suitable for USB dongles, wireless LAN modules, and battery-powered cameras requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for MIC5317-1.8YM5-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 Inc. is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving industrial, automotive, consumer, and communications markets with high-reliability semiconductor products.

The MIC5317 product line delivers ultra-compact, high-PSRR LDOs targeting space-constrained portable electronics and battery-operated systems where low quiescent current, fast transient response, and robust protection are essential.

FAQ

What is the maximum input voltage rating for the MIC5317-1.8YM5-T5?

The MIC5317-1.8YM5-T5 has an absolute maximum input voltage rating of +7 V, but its specified operating input range is +2.5 V to +6.0 V. Exceeding 6.0 V may cause permanent damage or violate reliability specifications, even if below the 7 V absolute limit. Always maintain VIN within 2.5–6.0 V during normal operation to ensure compliance with the datasheet's electrical characteristics and thermal limits for the MIC5317-1.8YM5-T5.

Does the MIC5317-1.8YM5-T5 require an external capacitor on the enable pin?

No, the MIC5317-1.8YM5-T5 does not require an external capacitor on the enable (EN) pin. Its CMOS-input EN pin draws only 0.01–1 μA and is designed for direct connection to a GPIO or logic-level signal. However, a pull-up resistor (e.g., 100 kΩ to VIN) is recommended if the driving source is open-drain or high-impedance to prevent floating, which could cause indeterminate output behavior in the MIC5317-1.8YM5-T5.

Can the MIC5317-1.8YM5-T5 be used with a 10 μF output capacitor?

Yes, the MIC5317-1.8YM5-T5 remains stable with output capacitances ≥1 μF, including 10 μF ceramic capacitors. While the design is optimized for 1 μF, larger values do not harm stability and may improve low-frequency transient response. Avoid high-ESR types like aluminum electrolytic; use X5R/X7R ceramics. Performance gains beyond 1 μF are marginal, so 10 μF is acceptable but not necessary for most applications using the MIC5317-1.8YM5-T5.

Is the NC pin on the MIC5317-1.8YM5-T5 electrically connected internally?

No, Pin 5 (NC) on the MIC5317-1.8YM5-T5 is a true no-connect terminal - it is not bonded or connected to any internal circuitry. It may be left unconnected, tied to ground for mechanical reinforcement, or omitted from the PCB footprint. Microchip explicitly states in the datasheet that NC is "not internally connected," confirming no functional or electrical role for this pin in the MIC5317-1.8YM5-T5.

What is the thermal resistance (θ_JA) of the MIC5317-1.8YM5-T5 package?

The MIC5317-1.8YM5-T5 uses the 5-lead SOT23-5 (M5) package, which has a junction-to-ambient thermal resistance (θ_JA) of 253°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two thermal vias. Actual θ_JA in a real design depends on PCB layout; improving copper area and via count can reduce effective θ_JA, directly enhancing the safe operating temperature margin for the MIC5317-1.8YM5-T5.