Microchip Technology MIC5265-2.85YD5

Overview

MIC5265-2.85YD5 from Micrel is a 150mA low-dropout linear regulator in Pb-Free Thin SOT-23-5 package, delivering fixed 2.85V output with 210mV dropout at full load, 57µV_rms output noise, and 60dB PSRR at 1kHz. It serves as a clean power source for RF receiver stages and digital baseband circuitry in portable battery-powered systems.

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 shutdown discharge capability, compatibility with 0.01µF bypass capacitor for noise reduction, stable operation with ceramic output capacitors ≥1µF, and enable-input logic thresholds (1.6V high / 0.2V low) for reliable control in mixed-signal environments.

Technical Context

The MIC5265-2.85YD5 integrates a CMOS-based error amplifier, quick-start noise cancellation circuitry, and an N-channel active shutdown MOSFET that discharges the output when disabled. Its internal reference is bypassed via Pin 4 (BYP), enabling configurable noise performance without sacrificing turn-on speed.

It operates across 2.7V–5.5V input range - supporting single-cell Li-ion (3.0–4.2V) and fixed 3.3V/5V rails - and maintains regulation down to zero load while consuming only 75µA quiescent current. Thermal shutdown activates at 150°C with 10°C hysteresis, and junction-to-ambient thermal resistance is 235°C/W in standard layout.

Key Specifications

Pinout & Package

Pb-Free Thin SOT-23-5 (M5/D5) package: 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch, gull-wing leads. RoHS-compliant, moisture-sensitive level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-285T50 and TCS2102-2850DBVR, the MIC5265-2.85YD5 uniquely combines low-noise operation (via BYP pin), active output discharge, and RF-grade PSRR - making it the only option among the three qualified for GPS receiver RF power rails requiring simultaneous low noise, fast shutdown, and stable light-load behavior.

Availability

MIC5265-2.85YD5 is available at Aetrix Electronics and suitable for GPS receivers, cellular telephones, and portable medical sensors requiring stable component supply, long-term lifecycle support, 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 designed specifically for cost-sensitive, space-constrained portable electronics requiring clean, low-quiescent-current power regulation with robust enable control and RF-friendly noise performance.

FAQ

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

The MIC5265-2.85YD5 has an absolute maximum input voltage rating of +7V, but its recommended operating range is +2.7V to +5.5V. Exceeding 5.5V may trigger internal protection or cause permanent damage. For single-cell Li-ion applications, the 2.7V–5.5V range covers full charge (4.2V) to end-of-discharge (3.0V), ensuring reliable operation across battery life. Always observe derating guidelines per thermal data in the MIC5265-2.85YD5 datasheet.

Does the MIC5265-2.85YD5 require an external bypass capacitor, and what value is recommended?

Yes, the MIC5265-2.85YD5 uses Pin 4 (BYP) to connect an external capacitor that reduces output noise by bypassing the internal reference. A 0.01µF ceramic capacitor is recommended for most RF applications; values up to 1.0µF are supported and further improve PSRR, though turn-on time increases slightly. The MIC5265-2.85YD5 includes a quick-start circuit to minimize this delay - enabling use of larger BYP caps without compromising system startup timing.

How does the active shutdown feature of the MIC5265-2.85YD5 work, and what is its design benefit?

The MIC5265-2.85YD5 integrates an N-channel MOSFET between OUT and GND that turns on when the EN pin is driven low. This actively discharges the output capacitor and load, bringing V_OUT to near-zero volts within microseconds. This prevents floating voltages that could cause latch-up or false triggering in downstream logic - eliminating the need for external bleed resistors and simplifying power sequencing in portable devices using the MIC5265-2.85YD5.

Can the MIC5265-2.85YD5 operate stably with no load, and why does that matter?

Yes, the MIC5265-2.85YD5 remains stable and in regulation with zero output load - a feature uncommon in many LDOs. This is essential for applications like keeping CMOS RAM alive or powering real-time clocks during deep sleep modes, where load current drops to near-zero but regulation must be maintained. The MIC5265-2.85YD5 achieves this via internal compensation optimized for wide load ranges, avoiding the need for minimum load resistors that waste power and reduce efficiency.

What ceramic capacitor dielectrics are recommended for use with the MIC5265-2.85YD5 output, and why?

X7R and X5R dielectric ceramic capacitors are recommended for the MIC5265-2.85YD5 output because they maintain ≥85% of rated capacitance across –40°C to +125°C, ensuring stable loop compensation and PSRR performance over temperature. Y5V and Z5U types exhibit >50% capacitance loss over the same range, risking instability or degraded transient response. The MIC5265-2.85YD5 is characterized and guaranteed for stability with ≥1µF X7R/X5R ceramics - matching its internal compensation design.