Microchip Technology MIC5206-3.2BM5-TR

Overview

MIC5206-3.2BM5-TR from Micrel is a 3.2V fixed-output, 150mA low-noise LDO regulator in SOT-23-5 package, featuring 165mV dropout at full load, 600µA ground current at 100mA, and ±1% initial output voltage accuracy. It integrates logic-compatible enable/shutdown control, open-collector error flag for undervoltage monitoring, and reversed-battery protection-designed for battery-powered handheld devices requiring stable, ultra-low-quiescent-power regulation.

For engineers reviewing the MIC5206-3.2BM5-TR datasheet, MIC5206-3.2BM5-TR pinout, MIC5206-3.2BM5-TR application, or MIC5206-3.2BM5-TR equivalent, key selection criteria include dropout performance at 150mA, enable logic thresholds (V_IL ≤ 0.4V, V_IH ≥ 2.0V), FLAG output behavior under undervoltage, thermal resistance (θ_JA = 220°C/W), and compatibility with ceramic output capacitors ≥1.0µF.

Technical Context

The MIC5206-3.2BM5-TR employs a PNP pass transistor architecture enabling ultra-low dropout voltage (17mV typical at light loads) and minimal ground current variation across load. Its internal undervoltage monitor compares output against nominal voltage with 5% threshold and 3% hysteresis, driving an open-collector FLAG pin that sinks ≥1mA when active.

Unlike standard LDOs, it supports reversed-battery protection without external components and maintains stability with no-load operation-critical for CMOS RAM keep-alive circuits. The SOT-23-5 pinout omits reference bypass (BYP), distinguishing it from 8-pin MSOP variants and confirming its role as a cost-optimized, noise-tolerant fixed-voltage solution.

Key Specifications

Pinout & Package

SOT-23-5 package: compact 2.9mm × 1.6mm surface-mount footprint with exposed pad not electrically connected; optimized for space-constrained portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-3302E/TO and TPS76332QDBVRQ1, the MIC5206-3.2BM5-TR delivers superior dropout performance and integrated system-level protections (FLAG + REVBAT) in a smaller footprint-making it optimal for space- and battery-life-constrained portable designs where those features directly reduce component count and improve reliability.

Availability

MIC5206-3.2BM5-TR is available at Aetrix Electronics and suitable for cellular handset power management, laptop auxiliary rail regulation, PCMCIA card switching, industrial sensor node supply, and LoRaWAN modem applications requiring stable component supply across long production lifecycles.

Supply support for MIC5206-3.2BM5-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 specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.

The MIC5206 family was developed to address ultra-low-power, high-accuracy LDO requirements in portable electronics-emphasizing minimal dropout, zero-load stability, and integrated fault monitoring for battery longevity and system robustness.

FAQ

What is the maximum input voltage rating for the MIC5206-3.2BM5-TR?

The MIC5206-3.2BM5-TR has an absolute maximum input voltage of +20V, but its recommended operating range is +2.5V to +16V. Exceeding 16V risks exceeding thermal limits under load, while operation below 2.5V prevents regulation due to dropout constraints. Always maintain VIN ≥ VOUT + dropout voltage (≥3.365V at 150mA) for stable output.

Does the MIC5206-3.2BM5-TR require an external bypass capacitor on the BYP pin?

No-the MIC5206-3.2BM5-TR is the SOT-23-5 fixed-voltage variant and does not include a BYP pin. That functionality is exclusive to the 8-pin MSOP versions (e.g., MIC5206-3.2BMM). This simplifies layout and reduces BOM count for applications where ultra-low-noise performance is not required.

How does the FLAG pin behave during enable/disable transitions?

The FLAG pin of the MIC5206-3.2BM5-TR is an open-collector output that remains high-impedance until the output reaches regulation. During shutdown, FLAG floats; during startup, it asserts low only after V_OUT drops ≥5% below 3.2V. To avoid indeterminate states, ensure EN fall time is <100µs-achieved using a 10kΩ pull-down resistor if driven by slow GPIO.

Can the MIC5206-3.2BM5-TR operate without an output capacitor?

No-an output capacitor is mandatory for stability. The MIC5206-3.2BM5-TR requires ≥1.0µF ceramic capacitor between OUT and GND. Omitting it causes oscillation and output voltage collapse. For improved transient response, use 2.2µF–10µF; ESR must remain ≤5Ω and resonant frequency >1MHz-tantalum or aluminum electrolytic types meet this if rated for the operating temperature range.

Is the MIC5206-3.2BM5-TR pin-compatible with the LP2980 series?

The MIC5206-3.2BM5-TR uses the same SOT-23-5 pinout as the LP2980, but it is not a drop-in replacement due to differences in enable logic thresholds, FLAG functionality, and thermal characteristics. While physical mounting aligns, substituting requires validation of EN drive strength, FLAG pull-up configuration, and thermal derating-especially above 85°C ambient.