Microchip Technology MIC5365-3.0YC5-TR

Overview

The MIC5365-3.0YC5-TR is a high-performance, single-channel 150mA low-dropout (LDO) linear regulator manufactured by Microchip Technology (originally introduced by Micrel, now part of Microchip). It delivers a fixed 3.0V output from an input voltage range of 2.5V to 5.5V, making it an ideal point-of-load regulator for low-voltage digital and analog circuits in portable, battery-operated devices. Housed in an ultra-compact SC-70-5 package and shipped on tape and reel (TR), the MIC5365-3.0YC5-TR combines a high power-supply rejection ratio (PSRR), low quiescent current, and tight output accuracy to serve as a reliable, low-noise power rail in space-constrained designs such as mobile phones, digital cameras, GPS modules, and handheld consumer electronics. The device is fully stable with a single 1µF ceramic output capacitor, simplifying the BOM and reducing solution footprint.

Technical Context

In a typical system signal chain, the MIC5365-3.0YC5-TR sits between the main system power rail (or battery) and sensitive load circuitry such as RF transceivers, baseband processors, sensor modules, or low-noise analog front-ends. Its primary role is to step down and stabilize a noisy or variable input supply into a clean, well-regulated 3.0V rail that downstream ICs can rely on. Internally, the regulator achieves this through a bandgap voltage reference, a high-gain error amplifier, and a PNP/P-channel pass element that continuously compares a fraction of the output voltage against the reference and adjusts the pass transistor to maintain regulation under varying line, load, and temperature conditions.

Because the MIC5365-3.0YC5-TR offers up to 80dB PSRR at low frequencies and only 200µVRMS of output noise (10Hz to 100kHz with 1µF COUT), it effectively isolates downstream loads from input ripple generated by switch-mode pre-regulators and from transient disturbances on the system bus. The active-high enable (EN) pin supports system-level power sequencing, allowing the host MCU to gate this rail and reduce the device to a near-zero shutdown current of approximately 0.05µA - a capability that is critical for extending battery life in always-on portable applications. Thermal-shutdown and current-limit protection further ensure that the regulator, the load, and the surrounding PCB remain safe during fault events such as output short circuits or excessive ambient temperature.

Key Specifications

• Output Voltage: Fixed 3.0V with ±2% initial accuracy (±3% over –40°C to +125°C), ensuring that sensitive 3V logic, sensor, and analog circuits receive a stable supply within a tight tolerance window.
• Input Voltage Range: 2.5V to 5.5V, allowing direct regulation from a single Li-ion cell, a 3-cell NiMH stack, or a 5V USB/bus rail without additional pre-regulation.
• Output Current: 150mA guaranteed continuous, sufficient to power microcontrollers, low-power RF sections, image sensors, and companion ICs in portable designs.
• Dropout Voltage: 155mV typical at 150mA (for VOUT ≥ 2.8V), maximizing usable battery life by allowing regulation to continue even as the input sag approaches the output voltage.
• Quiescent (Ground) Current: 29µA typical (39µA max), minimizing battery drain in always-on portable devices and extending standby run-time.
• Power Supply Rejection Ratio (PSRR): 80dB at up to 1kHz and 65dB from 1kHz to 10kHz, attenuating input ripple and switching noise from upstream buck converters or noisy system rails.
• Output Noise: 200µVRMS (10Hz to 100kHz with 1µF COUT), supporting clean rails for low-noise analog and RF loads where signal integrity is critical.

Pinout & Package

The MIC5365-3.0YC5-TR is supplied in a 5-lead SC-70 (SC-70-5 / SOT-353) surface-mount package on tape and reel. The package occupies minimal PCB area and is RoHS-compliant (Pb-free lead finish). Pin assignments are as follows:

• Pin 1 - VIN: Unregulated supply input. Place a 1µF ceramic capacitor as close to this pin as possible to decouple input ripple and ensure loop stability.
• Pin 2 - GND: Ground reference. Connect directly to a clean ground plane for low impedance and good thermal dissipation.
• Pin 3 - EN: Active-high enable input. Drive high (≥1.2V) to turn the regulator on and low (≤0.2V) to shut it down; do not leave this pin floating.
• Pin 4 - NC: No internal connection. May be left floating or tied to ground for layout convenience.
• Pin 5 - VOUT: Regulated 3.0V output. Place a 1µF ceramic capacitor close to the pin and at the load to maintain stability and transient response.

PCB Design Notes: The SC-70-5 package exhibits a junction-to-ambient thermal resistance (θJA) of approximately 256.5°C/W, so designs operating at high ambient temperature or near full load should widen the copper pours on the VIN and VOUT pads and use thermal vias to an internal ground plane to improve power dissipation. Input and output capacitors must be located within 3mm of their respective pins to minimize trace inductance and preserve the regulator's stability margin and transient performance. A solid ground plane directly under the device is recommended to provide both a low-impedance return path and a thermal spreading path.

Key Features

• Ultra-compact SC-70-5 package - enables high-density point-of-load regulation in wearables, hearables, and mobile devices where board space is at a premium and every square millimeter counts.
• Stable with only 1µF ceramic output capacitor - reduces BOM cost and footprint compared to LDOs that require larger tantalum or electrolytic capacitors, simplifying procurement and assembly.
• High PSRR (80dB at ≤1kHz) - suppresses buck converter ripple and system bus noise, providing a clean rail for noise-sensitive RF and analog circuits in mobile and imaging applications.
• Low 29µA quiescent current - extends battery run-time in portable, always-on applications such as fitness trackers, IoT sensors, and remote controls.
• ±2% initial output accuracy - ensures tight supply tolerance for processors and sensors with narrow voltage windows, improving system yield and reliability.
• Thermal-shutdown and current-limit protection - safeguards the device and downstream circuitry during fault conditions such as output short circuits, sustained overcurrent, or excessive ambient temperature.
• Near-zero shutdown current (~0.05µA) - supports system-level power gating for further energy savings in standby and sleep modes, extending battery life in portable products.

Applications

Equivalent & Alternatives

When evaluating the MIC5365-3.0YC5-TR equivalent options, designers typically consider the following pin-compatible or functionally similar alternatives:

• MIC5366-3.0YC5-TR: A pin-compatible drop-in that adds an output auto-discharge function, rapidly discharging VOUT when EN is driven low. Choose this MIC5365-3.0YC5-TR equivalent when downstream loads must be discharged quickly for power-sequencing or hot-swap safety.
• MIC5365-3.0YMT-TR: The same electrical specification in a 4-pin 1mm × 1mm Thin MLF leadless package with a lower θJA (240°C/W). Choose this variant when an even smaller footprint and better thermal performance are required.
• Texas Instruments TLV70030: A comparable 150mA LDO in SC-70-5 with similar PSRR and noise performance but slightly different EN-threshold and noise specs. Useful as a second source for supply-chain resilience.

Selection Guidance: Compared with the MIC5366-3.0YC5-TR, the MIC5365-3.0YC5-TR is optimized for lowest cost and simplest enable behavior, while the MIC5366 variant is better for systems requiring fast output discharge during shutdown. In the MIC5365-3.0YC5-TR vs TLV70030 comparison, the Microchip part offers a broader fixed-voltage family and Micrel-heritage LDO design, whereas the TI part may be preferred when a dual-sourced BOM is mandated. For new designs needing a 3.0V rail up to 150mA in minimal space, the MIC5365-3.0YC5-TR is the recommended default; migrate to the MIC5366-3.0YC5-TR equivalent if auto-discharge is required, or to the MLF version if thermal density is a concern.

Quality

• Original, factory-direct parts: 100% genuine Microchip (Micrel-heritage) product, fully traceable to manufacturer lot code and date code.
• Electrical testing: Each unit is verified for output voltage accuracy, dropout voltage, quiescent current, and EN threshold before shipment.
• ESD handling: The device is ESD-sensitive (2kV HBM rating) and is handled and shipped exclusively in ESD-shielded packaging using proper grounding procedures.
• Full traceability: Certificate of Conformance (COC), material declaration, and RoHS/REACH compliance documentation are available on request for production and audit support.

Availability

• Stable supply: Backed by Microchip's authorized global distribution network with consistent stock levels for production scaling.
• Bulk support: Available in tape-and-reel quantities suitable for both prototype builds and high-volume mass production.
• Long-term supply: The MIC5365 family carries a long product lifecycle typical of Microchip LDOs, supporting multi-year roadmaps in industrial and consumer designs.
• Delivery capability: Flexible lead times with global logistics support; samples are typically available within 48 hours for qualified projects.

Manufacturer

Microchip Technology is a leading US-based manufacturer of microcontrollers, analog and mixed-signal ICs, and power management solutions, serving markets from consumer and industrial to automotive and aerospace. The MIC5365 family originated in the LDO portfolio of Micrel Inc., which Microchip acquired in 2015; Micrel was recognized industry-wide for high-PSRR, low-noise, robustly protected LDO regulators. Microchip's power management division continues to invest in low-quiescent-current, high-PSRR LDO technology, supporting designs from battery-powered wearables to industrial and automotive systems with comprehensive datasheets, reference designs, simulation models, and long-term supply commitments that engineers can rely on across the full product lifecycle.

FAQ

• Where can I find the MIC5365-3.0YC5-TR datasheet download? The official MIC5365-3.0YC5-TR datasheet is published by Microchip and is also mirrored by authorized distributors; always verify the revision date (current revision is 3.1, dated July 2013) before finalizing a design.
• What is the correct MIC5365-3.0YC5-TR pinout design? In the SC-70-5 package, Pin 1 = VIN, Pin 2 = GND, Pin 3 = EN (active high, do not float), Pin 4 = NC, Pin 5 = VOUT. Place 1µF ceramic capacitors on both input and output within 3mm of the pins for stable MIC5365-3.0YC5-TR pinout operation.
• What is the MIC5365-3.0YC5-TR application best suited for? The MIC5365-3.0YC5-TR application is best suited for portable, battery-powered devices needing a clean, low-noise 3.0V rail up to 150mA - such as mobile phones, GPS modules, wearables, digital cameras, and handheld instruments.
• Is there a MIC5365-3.0YC5-TR equivalent with auto-discharge? Yes - the MIC5366-3.0YC5-TR is the pin-compatible MIC5365-3.0YC5-TR equivalent that adds an output auto-discharge function activated when EN is driven low.
• What output capacitor does the MIC5365-3.0YC5-TR require? The device is stable with a single 1µF ceramic capacitor on the output; no series resistor or larger tantalum capacitor is required, simplifying the BOM.