Microchip Technology MIC5248-1.2YM5-TR

Overview

MIC5248-1.2YM5-TR from Micrel is a 150mA, 1.2V fixed-output CMOS low-dropout (LDO) regulator in Pb-free SOT-23-5 package with integrated Power Good (PG) open-drain output, ±3% initial output voltage accuracy, and ultra-low 100µA ground current across load. It enables precise power-up sequencing for low-voltage microprocessors in space-constrained portable electronics.

For engineers reviewing the MIC5248-1.2YM5-TR datasheet, MIC5248-1.2YM5-TR pinout, MIC5248-1.2YM5-TR application, or MIC5248-1.2YM5-TR equivalent, key selection criteria include its 1.2V fixed output, 2.7–6V input range, active-high TTL-compatible enable, thermal shutdown, and stability with 1µF ceramic output capacitors - critical for battery-powered handheld designs requiring fast transient response and low quiescent current.

Technical Context

The MIC5248-1.2YM5-TR uses a P-channel MOSFET pass device with N-channel clamp for totem-pole output stage, enabling fast transient recovery during load steps from 100mA to 100µA. Its internal circuitry monitors output undervoltage (96.5% VOUT turn-on threshold), overcurrent, overtemperature, and dropout conditions to drive the open-drain PG output with 1–5ms delay.

It operates with load-independent ground current (100µA typ. at IOUT = 0–150mA), supports CMOS-compatible enable logic (VIH ≥ 1.6V, VIL ≤ 0.4V), and maintains stability using low-ESR ceramic capacitors without requiring external compensation - eliminating need for tantalum or electrolytic types.

Key Specifications

Pinout & Package

Package: Pb-free 5-pin SOT-23 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1202E/TT and TPS7A0512PDBVR, the MIC5248-1.2YM5-TR uniquely combines 100µA ground current, precise 96.5% PG threshold, and active-high enable in a Pb-free SOT-23-5 - making it optimal for compact, battery-sensitive designs requiring deterministic power sequencing without added components.

Availability

MIC5248-1.2YM5-TR is available at Aetrix Electronics and suitable for laptop power sequencing, handheld wireless baseband regulation, and PCMCIA VCC switching requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MIC5248-1.2YM5-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 analog and mixed-signal semiconductor company founded in 1978 and acquired by Microchip Technology in 2015. It specialized in power management, timing, and interface ICs for industrial and communications markets.

The MIC5248 family was designed specifically for space-constrained, battery-powered portable electronics needing accurate, low-quiescent LDOs with integrated power-good signaling - targeting applications where board area, thermal performance, and startup reliability are critical.

FAQ

What is the maximum input voltage rating for MIC5248-1.2YM5-TR?

The absolute maximum input voltage for MIC5248-1.2YM5-TR is +7V, but the recommended operating range is +2.7V to +6V. Exceeding 6V may degrade long-term reliability or trigger thermal shutdown under load. For continuous operation at 150mA output, the practical maximum input depends on ambient temperature and PCB thermal design - e.g., at 50°C ambient with standard SOT-23-5 layout, VIN must stay ≤3.4V to avoid exceeding 125°C junction limit.

Does MIC5248-1.2YM5-TR require an input capacitor?

No, MIC5248-1.2YM5-TR does not require an input capacitor for stability. However, a 1µF ceramic capacitor is recommended when the bulk supply is located more than 10 inches from the device or when powered directly from a battery to suppress source impedance effects and improve transient immunity. The absence of mandatory input capacitance simplifies layout and reduces BOM cost.

How does the Power Good (PG) output behave during fault conditions?

The PG output of MIC5248-1.2YM5-TR is an open-drain signal that goes low when both undervoltage (VOUT < 89.5% of 1.2V) AND at least one fault condition (overcurrent, overtemperature, or dropout) occurs. It remains low until VOUT rises above 96.5% of nominal (≥1.158V) and a 1–5ms internal delay expires. This dual-condition behavior prevents false resets during brief line sags or momentary overloads.

Can MIC5248-1.2YM5-TR be used with Y5V ceramic output capacitors?

Y5V dielectric capacitors are not recommended for MIC5248-1.2YM5-TR because their capacitance can drop up to 60% over temperature and voltage, risking instability if minimum 1µF effective value is not maintained. X7R ceramics (±15% variation) or tantalum capacitors (±10%) are preferred. If Y5V must be used, the nominal value must be significantly oversized - e.g., ≥3.3µF - to ensure ≥1µF minimum across –40°C to +125°C.

What is the shutdown current of MIC5248-1.2YM5-TR?

The shutdown current of MIC5248-1.2YM5-TR is 0.45µA typical (1µA max) when EN is held low (≤0.4V). In this state, the regulator enters "zero" off-mode current, disabling the pass element and internal bias circuits. The output is actively discharged via an internal N-channel clamp, ensuring rapid and controlled de-energization of downstream loads - critical for low-power sleep modes in portable devices.