Microchip Technology MIC5247-1.5YML-TR

Overview

MIC5247-1.5YML-TR from Micrel is a fixed 1.5V, 150mA ultra-low-noise CMOS linear voltage regulator in a 6-pin 2mm × 2mm MLF™ package, featuring 1% initial output accuracy, 85µA load-independent ground current, and a dedicated noise-bypass pin (BYP) for RF-sensitive applications such as cellular transceivers and low-power wireless receivers.

For engineers reviewing the MIC5247-1.5YML-TR datasheet, MIC5247-1.5YML-TR pinout, MIC5247-1.5YML-TR application, or MIC5247-1.5YML-TR equivalent, key selection criteria include dropout voltage (150mV at 150mA), PSRR (50dB at ≤1kHz), thermal shutdown (150°C), logic-compatible enable input, and stability with 1µF ceramic output capacitors - all critical for battery-powered portable electronics design.

Technical Context

The MIC5247-1.5YML-TR uses a P-channel MOSFET pass device with an N-channel active clamp to achieve fast transient response and prevent output overshoot during load removal. Its reference bypass architecture enables 30µV_RMS output noise (10Hz–100kHz) when a 0.01µF capacitor is connected to the BYP pin.

It integrates under-voltage lockout, current limiting (160–300mA), and thermal shutdown with 10°C hysteresis. The CMOS enable input (VIH ≥ 1.6V, VIL ≤ 0.4V) supports direct connection to microcontroller GPIOs and ensures near-zero shutdown current (≤1µA).

Key Specifications

Pinout & Package

Package: 6-pin 2mm × 2mm MLF™ (exposed pad grounded), RoHS-compliant, thermal resistance θ_JA = 90°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1502E/TO and TCS2115-1.5VDBVR, the MIC5247-1.5YML-TR uniquely combines BYP-pin programmability, 150mA capability, and MLF™ thermal performance - making it optimal for RF-critical, space-constrained, and battery-sensitive designs where both noise suppression and controlled shutdown are mandatory.

Availability

MIC5247-1.5YML-TR is available at Aetrix Electronics and suitable for cellular transceivers, portable medical sensors, laptop subsystems, and IoT edge nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MIC5247-1.5YML-TR 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 high-performance analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.

The MIC5247 family was designed specifically for ultra-low-noise, low-voltage regulation in handheld and battery-powered RF systems - emphasizing precision, minimal quiescent current, and compact packaging for space-constrained wireless devices.

FAQ

What is the minimum input voltage required for MIC5247-1.5YML-TR to regulate 1.5V output?

The MIC5247-1.5YML-TR requires a minimum input voltage of 2.7V per its operating rating. At 150mA load, its 150mV dropout means the input must be ≥1.65V, but the absolute minimum specified input is 2.7V to ensure proper internal circuit operation and thermal margin. Below 2.7V, the device may enter undervoltage lockout or fail to maintain regulation.

Can MIC5247-1.5YML-TR operate without the BYP capacitor?

Yes, the MIC5247-1.5YML-TR functions normally without the BYP capacitor - the BYP pin may be left open. However, omitting the 0.01µF capacitor increases output noise from 30µV_RMS to approximately 60–70µV_RMS, degrading performance in RF or precision analog applications. The BYP pin is optional but recommended for noise-sensitive use cases.

Is the NC pin on MIC5247-1.5YML-TR safe to connect to ground or leave floating?

The NC (pin 5) on MIC5247-1.5YML-TR is not internally connected and must remain unconnected - neither grounded nor tied to any signal. Connecting it may cause unpredictable behavior or damage due to potential internal bond-wire shorts. PCB layout should isolate this pad with solder mask and avoid routing traces or vias to it.

Does MIC5247-1.5YML-TR require an input capacitor for stability?

No, the MIC5247-1.5YML-TR does not require an input capacitor for stability. An input capacitor is only recommended if the bulk supply is more than 10 inches away from the device or when powered directly from a battery with high source impedance. The regulator's stability depends solely on the 1µF minimum ceramic output capacitor.

How does the active shutdown clamp in MIC5247-1.5YML-TR improve system-level reliability?

The active shutdown clamp in MIC5247-1.5YML-TR is an N-channel MOSFET that discharges the output capacitor and load when EN is pulled low. This prevents residual voltage from powering downstream circuitry unintentionally, avoids latch-up in connected logic, and ensures deterministic reset sequencing - critical for systems requiring strict power-state control like cellular modems and medical sensors.