Microchip Technology MIC5265-2.6YD5

Overview

MIC5265-2.6YD5 from Micrel is a 150mA low-dropout linear regulator in Pb-free Thin SOT-23-5 packaging, delivering a fixed 2.6V output with 210mV dropout at full load, 57µV_rms output noise, and 60dB PSRR at 1kHz. It serves as a clean, low-noise power source for RF and digital circuitry in portable electronics powered by single-cell Li-ion or fixed 3.3V/5V rails.

For engineers reviewing the MIC5265-2.6YD5 datasheet, MIC5265-2.6YD5 pinout, MIC5265-2.6YD5 application, or MIC5265-2.6YD5 equivalent, key selection criteria include its active shutdown discharge capability, CMOS-compatible enable input, stability with 1µF ceramic output capacitors, and operation across –40°C to +125°C junction temperature range.

Technical Context

The MIC5265-2.6YD5 integrates a precision bandgap reference, error amplifier, and N-channel pass transistor with an active shutdown MOSFET on the output. Its quick-start bypass circuit enables fast turn-on even with up to 1µF on the BYP pin while maintaining low noise performance.

It operates from 2.7V to 5.5V input, supports CMOS-level enable control (logic high ≥1.6V), and features thermal shutdown at 150°C with 10°C hysteresis. Ground current remains stable from no-load to 150mA, enabling reliable keep-alive operation in CMOS RAM applications.

Key Specifications

Pinout & Package

Packaged in Pb-free Thin SOT-23-5 (M5), the MIC5265-2.6YD5 uses a 5-pin surface-mount footprint with 0.95mm pitch and 1.3mm height, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-2602E/TT and XC6206P262MR-G, the MIC5265-2.6YD5 uniquely combines RF-grade noise performance, active output discharge, and CMOS-enable compatibility in a thermally capable Thin SOT-23-5 package - making it the only option among the three qualified for noise-sensitive, power-gated portable RF systems.

Availability

MIC5265-2.6YD5 is available at Aetrix Electronics and suitable for cellular telephony, GPS receivers, PDAs, and Bluetooth LE wearable designs requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for MIC5265-2.6YD5 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 product line was designed specifically for cost-sensitive, space-constrained portable electronics requiring low-noise, fast-response LDOs with integrated enable and active discharge - targeting RF front-ends and digital basebands in handheld devices.

FAQ

What is the minimum input voltage required for MIC5265-2.6YD5 to maintain regulation at 150mA load?

The MIC5265-2.6YD5 requires a minimum input voltage of 2.81V to maintain regulation at 150mA, calculated from its 210mV dropout voltage added to the 2.6V nominal output. This allows direct operation from a single-cell Li-ion battery down to ~2.8V, supporting extended runtime in portable applications before cutoff.

Does MIC5265-2.6YD5 require an external bypass capacitor, and what value is recommended?

Yes, the MIC5265-2.6YD5 requires an external capacitor on the BYP pin to minimize output noise. A 0.01µF ceramic capacitor is recommended for standard low-noise operation; values up to 1µF further improve PSRR but slightly increase turn-on time. The BYP capacitor connects between Pin 4 (BYP) and GND, independent of the 1µF output capacitor on Pin 5 (OUT).

How does the active shutdown feature of MIC5265-2.6YD5 function during disable?

When the EN pin is driven low, the MIC5265-2.6YD5 enters zero-current shutdown and activates an internal N-channel MOSFET between the OUT and GND pins. This provides a 500Ω discharge path, rapidly de-energizing the output capacitor and downstream load - preventing unintended wake-up or latch-up in power-gated systems.

Can MIC5265-2.6YD5 operate stably with zero load current?

Yes, the MIC5265-2.6YD5 maintains regulation and stability with zero load current, unlike many LDOs that require minimum load for loop stability. This makes it suitable for CMOS RAM keep-alive circuits and always-on real-time clock domains where load current drops to near-zero during deep sleep modes.

What thermal derating applies to MIC5265-2.6YD5 in a standard Thin SOT-23-5 layout?

In a standard PCB layout with minimal copper (θ_JA = 235°C/W), the MIC5265-2.6YD5 must be derated to ~100mA at 25°C ambient to stay below its 125°C max junction temperature when dropping 2.4V (e.g., 5.0V_IN → 2.6V_OUT). At 150mA, maximum ambient temperature falls to ~47°C - confirming need for thermal relief pads or airflow in high-power portable designs.