Microchip Technology MIC5265-2.85YD5-TR

Overview

MIC5265-2.85YD5 from Micrel is a 150mA low-dropout linear regulator in Pb-free Thin SOT-23-5 packaging, designed for cost-sensitive portable electronics. It delivers a fixed 2.85V output with 210mV dropout at full load, 57µV_rms output noise, and 60dB PSRR at 1kHz-making it suitable for RF power supply rails in GPS receivers and cellular handsets.

For engineers reviewing the MIC5265-2.85YD5 datasheet, MIC5265-2.85YD5 pinout, MIC5265-2.85YD5 application, or MIC5265-2.85YD5 equivalent, key selection criteria include its active-high enable input, zero-off-mode shutdown current (<2µA), compatibility with 1µF ceramic output capacitors, and thermal shutdown at 150°C.

Technical Context

The MIC5265-2.85YD5 integrates a CMOS-based error amplifier, quick-start noise cancellation circuitry, and an N-channel active-shutdown MOSFET to discharge the output during disable. Its reference bypass (BYP) pin accepts 0.01–1.0µF capacitors to reduce output noise and improve PSRR without compromising turn-on time.

It operates across 2.7V–5.5V input voltage range and maintains regulation down to zero load. The device features under-voltage lockout, thermal shutdown with 10°C hysteresis, and stable operation with ceramic capacitors as low as 1µF and ESR ≤300mΩ.

Key Specifications

Pinout & Package

Pb-Free Thin SOT-23-5 (M5) package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2852E/TT and XC6206P282MR-G, the MIC5265-2.85YD5 uniquely combines 2.85V precision, active output discharge, and configurable noise suppression via the BYP pin-making it optimal for RF-sensitive, enable-controlled portable systems where output voltage tolerance and transient behavior are tightly specified.

Availability

MIC5265-2.85YD5 is available at Aetrix Electronics and suitable for cellular telephones, GPS receivers, and portable medical sensors requiring stable component supply, long-term manufacturability, and Pb-free compliance.

Supply support for MIC5265-2.85YD5 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

Micrel Inc. was a U.S.-based semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.

The MIC5265 family was developed for cost-effective, space-constrained portable electronics requiring high PSRR, low noise, and enable-controlled power sequencing-particularly in RF subsystems and battery-operated digital devices.

FAQ

What is the maximum input voltage rating for the MIC5265-2.85YD5?

The MIC5265-2.85YD5 has an absolute maximum input voltage of +7V, but its recommended operating range is +2.7V to +5.5V. Exceeding 5.5V may trigger internal protection or cause reliability issues. For single-cell Li-ion applications, the 2.7V minimum ensures operation down to end-of-discharge voltage, while the 5.5V upper limit safely accommodates 5V USB or wall-adapter inputs. Always observe derating guidelines per thermal calculations in the datasheet.

Does the MIC5265-2.85YD5 require an external bypass capacitor on the BYP pin?

The MIC5265-2.85YD5 does not require an external bypass capacitor on the BYP pin-it may be left open-but adding a 0.01µF capacitor significantly reduces output noise (to 57µV_rms) and improves PSRR. Larger values (up to 1.0µF) further enhance noise performance at the cost of slightly increased turn-on time. The device's unique quick-start circuit mitigates delay penalties, making the BYP pin a design-flexible option for RF-critical applications.

Can the MIC5265-2.85YD5 remain stable with no load connected?

Yes, the MIC5265-2.85YD5 remains stable and in regulation with zero load-a feature uncommon among many LDOs. This is essential for applications like CMOS RAM keep-alive circuits, real-time clock backups, or sensor bias rails that must retain voltage during deep-sleep modes. Stability is guaranteed with ≥1µF ceramic output capacitance and does not require minimum load resistors or dummy loads.

What is the purpose of the active shutdown function in the MIC5265-2.85YD5?

When the EN pin is driven low, the MIC5265-2.85YD5 activates an internal N-channel MOSFET that connects the OUT pin to GND, actively discharging the output capacitor and downstream load. This ensures rapid, controlled de-energization-preventing floating voltages, unintended wake-up events, or latch-up in powered-down subsystems. Unlike passive leakage discharge, this feature guarantees predictable shutdown behavior in multi-rail portable systems.

Is the MIC5265-2.85YD5 compatible with standard SOT-23-5 PCB footprints?

Yes, the MIC5265-2.85YD5 uses the industry-standard Pb-Free Thin SOT-23-5 (M5) package with 0.95mm lead pitch and 2.9mm × 1.6mm body dimensions. It is mechanically compatible with common SOT-23-5 land patterns, including IPC-7351B SOICN50P290X160X110-5N. Thermal performance assumes minimum footprint copper; for higher ambient temperatures, refer to θ_JA = 235°C/W and apply appropriate copper pour per Micrel's layout guidelines.