Microchip Technology MIC5206-3.8BM5-TR

Overview

MIC5206-3.8BM5-TR from Micrel is a 150mA fixed-output low-dropout linear regulator delivering 3.8V with ±2% output voltage accuracy, 165mV dropout at full load, and 600µA ground current at 100mA - designed for battery-powered handheld devices requiring ultra-low-noise, logic-controlled enable, and undervoltage monitoring.

For engineers reviewing the MIC5206-3.8BM5-TR datasheet, MIC5206-3.8BM5-TR pinout, MIC5206-3.8BM5-TR application, or MIC5206-3.8BM5-TR equivalent, key selection criteria include dropout performance at light-to-full load, EN/FLAG interface compatibility, SOT-23-5 thermal limits (θJA = 220°C/W), and noise reduction via optional BYP capacitor - all critical for portable power integrity.

Technical Context

The MIC5206-3.8BM5-TR integrates a precision bandgap reference, CMOS-compatible enable input (VIH ≥ 2.0V, VIL ≤ 0.4V), and open-collector error flag with 5% undervoltage threshold and 3% hysteresis. Its internal pass transistor delivers regulated output with <40ppm/°C temperature coefficient and <0.05%/W thermal regulation.

It operates across VIN = 2.5V to 16V, supports ceramic or tantalum output capacitors (≥1.0µF without BYP, ≥2.2µF with 470pF BYP), and features reversed-battery protection, current limiting (320–500mA), and thermal shutdown - enabling robust operation in variable-input, space-constrained systems.

Key Specifications

Pinout & Package

Package: 5-pin SOT-23 (M5), surface-mount, 2.9mm × 1.6mm footprint, rated for –40°C to +125°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700T-3802E/MB and TPS76338DBVR, the MIC5206-3.8BM5-TR uniquely combines FLAG-based fault signaling, reversed-battery hardening, and lowest dropout in its class - making it optimal for mission-critical portable systems where input polarity errors and brown-out response must be handled autonomously.

Availability

MIC5206-3.8BM5-TR is available at Aetrix Electronics and suitable for cellular telephony, laptop subsystems, PCMCIA regulation, and SMPS post-regulation requiring stable component supply, long-lifecycle support, and guaranteed parametric compliance.

Supply support for MIC5206-3.8BM5-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 designed specifically for battery-powered portable electronics demanding ultra-low-noise, low-quiescent LDOs with integrated system supervision - targeting handheld, notebook, and PCMCIA applications where reliability and efficiency are co-prioritized.

FAQ

What is the maximum input voltage rating for the MIC5206-3.8BM5-TR?

The MIC5206-3.8BM5-TR has an absolute maximum input voltage rating of +20V, but its recommended operating input range is +2.5V to +16V. Exceeding 16V may trigger internal protection mechanisms or accelerate parametric drift. For sustained operation, maintain VIN ≤ 16V per the datasheet's Operating Ratings table - this ensures guaranteed dropout, regulation, and thermal performance across the full –40°C to +125°C junction temperature range. The MIC5206-3.8BM5-TR is not intended for automotive load-dump or industrial surge environments without external clamping.

Does the MIC5206-3.8BM5-TR support ultra-low-noise operation using a bypass capacitor?

No, the MIC5206-3.8BM5-TR does not support ultra-low-noise operation via a bypass capacitor because it uses the 5-pin SOT-23-5 package, which omits the BYP (reference bypass) pin. That feature is exclusive to the 8-pin MSOP variants (e.g., MIC5206-3.8BMM). The MIC5206-3.8BM5-TR achieves typical output noise performance without external BYP capacitance, relying instead on internal design optimizations. If sub-300nV/√Hz noise is required, the MIC5206-3.8BMM with 470pF BYP-to-GND is the appropriate variant.

How should the FLAG pin of the MIC5206-3.8BM5-TR be connected in a typical application?

The FLAG pin of the MIC5206-3.8BM5-TR is an open-collector output that sinks current when an undervoltage condition occurs (VOUT < ~3.61V). It requires an external pull-up resistor - typically 47kΩ to IN or 100kΩ to a stable higher rail - to provide a logic-high default state. Do not leave FLAG floating. In microcontroller-based systems, connect FLAG directly to a GPIO interrupt pin configured with internal or external pull-up. The MIC5206-3.8BM5-TR's FLAG has 3% hysteresis to prevent chatter near the trip point, and VOL is guaranteed ≤0.4V at 1mA sink current.

Can the MIC5206-3.8BM5-TR be used without connecting the EN pin?

Yes, the MIC5206-3.8BM5-TR can operate without an external EN signal by connecting pin 3 (EN) directly to pin 1 (IN). This configures the device for always-on operation, eliminating enable control but preserving all regulation, FLAG, and protection functions. However, doing so forfeits the <5µA shutdown current benefit. If low-power sleep modes are needed, drive EN from a logic source with VIH ≥ 2.0V (enable) and VIL ≤ 0.4V (shutdown); never leave EN floating, as that may cause erratic behavior or increased ground current in the MIC5206-3.8BM5-TR.

What output capacitor value is required for stable operation of the MIC5206-3.8BM5-TR?

The MIC5206-3.8BM5-TR requires a minimum 1.0µF output capacitor between OUT and GND for stable operation when no BYP capacitor is used - which applies to this SOT-23-5 variant. The capacitor must have ESR ≤5Ω and resonant frequency >1MHz; tantalum or aluminum electrolytic types are recommended. For improved transient response, larger values (e.g., 4.7µF–10µF) are acceptable and commonly used. At loads <10mA, capacitance may be reduced to 0.47µF; at <1mA, 0.33µF suffices. The MIC5206-3.8BM5-TR remains stable with zero load, supporting RAM keep-alive applications.