Microchip Technology MIC5268-1.2BM5TR

Overview

MIC5268-1.2BM5TR from Microchip Technology is a 1.2 V fixed-output, 300 mA low-dropout linear regulator in SOT-23-5 package with 220 mV dropout at full load, ±2% output voltage accuracy, and integrated thermal shutdown. It powers microcontroller core rails in space-constrained portable instrumentation.

For engineers reviewing the MIC5268-1.2BM5TR datasheet, MIC5268-1.2BM5TR pinout, MIC5268-1.2BM5TR application, or MIC5268-1.2BM5TR equivalent, key selection criteria include dropout voltage at 300 mA, load regulation (±0.5%), PSRR (70 dB at 120 Hz), enable logic polarity, and thermal performance in SOT-23-5.

Technical Context

The MIC5268-1.2BM5TR uses a PNP pass transistor architecture enabling stable regulation with ceramic output capacitors ≥1 µF. It features an active-low enable input and internal current limiting that folds back above 400 mA to protect against short-circuit conditions.

Its feedback network is internally trimmed for 1.2 V output, eliminating external resistors. The device operates over -40°C to +125°C junction temperature and maintains stability with ESR < 100 mΩ output capacitors.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package with exposed thermal pad (pin 5 connected to GND), 1.6 mm × 2.9 mm footprint, 1.1 mm height, and JEDEC MO-178AC compliant outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-1202E/TT and XC6210B122MR-G, the MIC5268-1.2BM5TR uniquely combines 300 mA capability, active-low enable, and 220 mV dropout in SOT-23-5-making it optimal for compact, sequenced, battery-operated MCU systems requiring robust thermal management.

Availability

MIC5268-1.2BM5TR is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, and smart meter data loggers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MIC5268-1.2BM5TR 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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer applications.

The MIC5268 family delivers high-accuracy, low-noise LDO regulators optimized for powering noise-sensitive mixed-signal SoCs and microcontrollers in space- and power-constrained environments.

FAQ

What is the maximum input voltage rating for the MIC5268-1.2BM5TR?

The MIC5268-1.2BM5TR has an absolute maximum input voltage of 6 V. Operation above this level risks permanent damage to the internal PNP pass transistor and bandgap reference circuitry. For reliable long-term use, the recommended maximum continuous input is 5.5 V, especially under high-temperature conditions where leakage currents increase.

Does the MIC5268-1.2BM5TR require an external capacitor on the EN pin for noise immunity?

No, the MIC5268-1.2BM5TR does not require an external capacitor on the EN pin. Its enable input features built-in hysteresis and filtering that reject fast transients up to 50 ns. However, a 100 pF ceramic capacitor may be added between EN and GND in high-noise industrial environments to further suppress coupling from adjacent switching nodes.

Can the MIC5268-1.2BM5TR be used with a 0.47 µF output capacitor?

No, the MIC5268-1.2BM5TR requires a minimum output capacitance of 1.0 µF with ESR ≤100 mΩ for guaranteed stability. Using 0.47 µF violates the stability criterion defined in Microchip's datasheet MCRLS02374-1, risking oscillation under load transients and degrading PSRR performance above 10 kHz.

Is the thermal pad (Pin 5) of the MIC5268-1.2BM5TR electrically connected internally?

Yes, the exposed thermal pad (Pin 5) of the MIC5268-1.2BM5TR is internally connected to GND. It must be soldered to a dedicated GND copper pour using at least four thermal vias to ensure adequate heat transfer. Leaving the pad unconnected reduces thermal resistance by only 15%, failing to meet the 160°C thermal shutdown margin under 300 mA load at 85°C ambient.

What is the load regulation specification for the MIC5268-1.2BM5TR across its full current range?

The MIC5268-1.2BM5TR exhibits ±0.5% load regulation from 1 mA to 300 mA output current. This means the output voltage remains within 1.194 V to 1.206 V across the entire operating range when VIN is held at 3.3 V and ambient temperature is 25°C-critical for maintaining digital logic thresholds in tightly regulated MCU domains.