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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Microchip Technology MIC5249-2.6BMM

Name: MIC5249-2.6BMM
Brand: Microchip Technology
SKU: MIC5249-2.6BMM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MIC5249-2.6BMM

Manufacturer:: Microchip Technology

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: MIC5249-2.6BMM.pdf

Description:: IC REG LINEAR 2.6V 300MA 8MSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MIC5249-2.6BMM from Micrel is a 300mA, 2.6V fixed-output CMOS low-dropout regulator with programmable power-on-reset delay, ±1.0% initial output accuracy, 340mV dropout at full load, and integrated noise-reduction bypass pin-designed for battery-powered handheld devices requiring ultra-low-noise, stable voltage regulation and reliable system initialization.

For engineers reviewing the MIC5249-2.6BMM datasheet, MIC5249-2.6BMM pinout, MIC5249-2.6BMM application, or MIC5249-2.6BMM equivalent, this page delivers verified specifications, validated MSOP-8 pin functions, real-world use cases in portable electronics, and two confirmed alternative LDOs with documented functional trade-offs.

Technical Context

The MIC5249-2.6BMM implements a CMOS-based LDO architecture with an internal reference buffered via the CBYP pin, enabling <0.01µF bypass capacitor support for >65dB PSRR at 120Hz. Its POR delay is set by external capacitor on DELAY pin (0.55µA current source, 1.4V threshold), generating a precise reset pulse after power-up.

It features active-clamp shutdown for rapid output discharge, zero-current shutdown mode (<1µA I_GND), thermal shutdown, and current limiting. The device remains stable with ≥2.2µF ceramic output capacitors (ESR ≤300mΩ) and requires only 1.0µF input capacitance.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 2.6V ±1.0% initial accuracy ensures tight rail tolerance for 2.6V logic or analog subsystems.
Max Output Current	300mA continuous delivery supports moderate-power RF modules or baseband processors without thermal derating in MSOP-8.
Dropout Voltage	340mV typical @ 300mA enables operation from 2.94V input-critical for single-cell Li-ion or Li-poly systems near end-of-discharge.
Ground Current	85µA quiescent current minimizes standby power loss in always-on circuits like RTC or memory keep-alive.
PSRR	65dB @ 120Hz suppresses ripple from switching converters or noisy DC/DC stages feeding the LDO input.
RESET Threshold	Active-low open-drain RESET asserts when V_OUT falls below 89–91% of nominal-provides robust undervoltage detection for microcontroller reset sequencing.
Delay Timing	Programmable POR delay via external capacitor on DELAY pin (I_DELAY = 0.55µA, V_TH = 1.4V) enables precise system boot timing control.

Pinout & Package

Package: 8-pin MSOP (MM), 3.0mm × 3.0mm × 1.0mm body, exposed pad optional, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 - CBYP	Reference bypass node	Connects to 0.01µF capacitor to GND; reduces output noise and improves PSRR by stabilizing internal bandgap reference.
2 - DELAY	POR delay timing input	Sinks 0.55µA current; external capacitor to GND sets RESET assertion delay time (T_DELAY = C_DELAY × 1.4V / 0.55µA).
3 - GND	Power ground reference	Primary return path for VIN, VOUT, and internal circuitry; must be low-impedance connection to minimize noise coupling.
4 - VIN	Input supply rail	Accepts 2.7V to 6V input; requires ≥1.0µF ceramic bypass capacitor to GND for stability and high-frequency noise rejection.
5 - VOUT	Regulated output	Delivers stable 2.6V ±1% to load; requires ≥2.2µF ceramic output capacitor (ESR ≤300mΩ) for loop stability.
6 - NC	No-connect terminal	Internally unconnected; must remain floating-no external connection permitted.
7 - RESET	Open-drain fault flag	Asserts low during undervoltage, overtemperature, or overcurrent; requires external pull-up resistor to VIN or VOUT.
8 - ENABLE	CMOS-compatible enable	Logic-high (>1.6V) enables regulator; logic-low (<0.4V) disables with <1µA shutdown current and active output clamp.

Key Features

Feature	Design Value
Ultra-low-noise regulation	CBYP pin supports 0.01µF reference bypass capacitor, reducing output voltage noise and enabling >65dB PSRR at 120Hz for sensitive RF/analog circuits.
Programmable POR delay	External capacitor on DELAY pin sets precise power-on reset timing-eliminates need for discrete RC timers or dedicated supervisor ICs.
Zero-current shutdown	ENABLE-driven shutdown draws <1µA total current, preserving battery life in deep-sleep modes of portable devices.
Active output clamp	Internal N-MOSFET discharges VOUT capacitor rapidly upon disable, preventing residual voltage hold-up that could interfere with system power sequencing.
No-load stability	Maintains regulation and stability with zero load current-essential for CMOS RAM keep-alive or always-on sensor bias rails.

Applications

Cellular Phone Baseband	Fiber Optic Transceiver Module
Use Scenario: Powering 2.6V core logic and analog front-end in 3G/4G handset baseband ICs during dynamic transmit/receive cycles. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.6V rail; RESET signal sequences baseband processor boot after battery insertion or cold reset. Use Value: 340mV dropout allows operation down to 2.94V input-extending usable battery range; 65dB PSRR prevents switching noise from PMIC corrupting RF performance.	Use Scenario: Supplying bias voltage to laser driver and post-amplifier ICs in SFP+ optical modules operating in temperature-varying environments. IC Role / Device Role / Timing Role: Precision 2.6V LDO with POR delay ensures transceiver ICs initialize only after stable voltage is established, avoiding lock-up during hot-plug events. Use Value: ±1.0% initial accuracy and ±3.0% over –40°C to +125°C maintains laser bias stability across industrial temperature range; MSOP-8 footprint saves board space in compact modules.
PDA Application Processor Core	Handheld Medical Diagnostic Device
Use Scenario: Regulating 2.6V supply for ARM-based application processor cores in legacy PDAs with limited PCB area and thermal budget. IC Role / Device Role / Timing Role: High-bandwidth LDO with fast transient response handles CPU burst currents; ENABLE pin synchronizes power with system wake-up signals. Use Value: 300mA output supports peak processor loads; 85µA quiescent current extends battery runtime during idle periods without compromising wake latency.	Use Scenario: Providing stable 2.6V rail to ADC reference buffers and low-noise op-amps in portable ECG or glucose meter front-ends. IC Role / Device Role / Timing Role: Ultra-low-noise LDO with CBYP filtering ensures <10µV_pp output ripple-critical for 16-bit+ medical-grade analog signal chains. Use Value: Bypass-capacitor-enabled noise reduction eliminates need for additional ferrite beads or LC filters, simplifying layout and improving reliability in field-deployed devices.

Cellular Phone Baseband

Fiber Optic Transceiver Module

Use Scenario: Powering 2.6V core logic and analog front-end in 3G/4G handset baseband ICs during dynamic transmit/receive cycles.

IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 2.6V rail; RESET signal sequences baseband processor boot after battery insertion or cold reset.

Use Value: 340mV dropout allows operation down to 2.94V input-extending usable battery range; 65dB PSRR prevents switching noise from PMIC corrupting RF performance.

Use Scenario: Supplying bias voltage to laser driver and post-amplifier ICs in SFP+ optical modules operating in temperature-varying environments.

IC Role / Device Role / Timing Role: Precision 2.6V LDO with POR delay ensures transceiver ICs initialize only after stable voltage is established, avoiding lock-up during hot-plug events.

Use Value: ±1.0% initial accuracy and ±3.0% over –40°C to +125°C maintains laser bias stability across industrial temperature range; MSOP-8 footprint saves board space in compact modules.

PDA Application Processor Core

Handheld Medical Diagnostic Device

Use Scenario: Regulating 2.6V supply for ARM-based application processor cores in legacy PDAs with limited PCB area and thermal budget.

IC Role / Device Role / Timing Role: High-bandwidth LDO with fast transient response handles CPU burst currents; ENABLE pin synchronizes power with system wake-up signals.

Use Value: 300mA output supports peak processor loads; 85µA quiescent current extends battery runtime during idle periods without compromising wake latency.

Use Scenario: Providing stable 2.6V rail to ADC reference buffers and low-noise op-amps in portable ECG or glucose meter front-ends.

IC Role / Device Role / Timing Role: Ultra-low-noise LDO with CBYP filtering ensures <10µV_pp output ripple-critical for 16-bit+ medical-grade analog signal chains.

Use Value: Bypass-capacitor-enabled noise reduction eliminates need for additional ferrite beads or LC filters, simplifying layout and improving reliability in field-deployed devices.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1702T-2602E/MB	2.6V fixed output, 250mA max, 600mV dropout @ full load, no RESET or DELAY pins.	Lacks POR delay and open-drain RESET-requires external supervisor for sequencing; suitable only where simple regulation suffices.	Select when cost sensitivity outweighs need for integrated reset and noise filtering; verify thermal margin at 300mA due to higher dropout.
TLS820B26TAV50	2.6V output, 300mA, integrated watchdog and windowed RESET, but 500mV dropout and automotive AEC-Q100 qualification.	Designed for automotive infotainment; includes watchdog timer and wider temp range (–40°C to +150°C), but larger SOIC-8 package.	Choose for automotive-grade designs needing enhanced diagnostics; avoid if board space or non-automotive qualification is required.

Compared with MCP1702T-2602E/MB and TLS820B26TAV50, the MIC5249-2.6BMM uniquely combines 340mV dropout, programmable POR delay, and 0.01µF bypass noise reduction in a space-constrained MSOP-8-making it optimal for portable consumer electronics where size, noise, and boot reliability are co-critical.

Availability

MIC5249-2.6BMM is available at Aetrix Electronics and suitable for cellular phones, fiber optic modules, and handheld medical devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MIC5249-2.6BMM 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, specializing in power management, interface, and timing solutions before its acquisition by Microchip Technology in 2015.

The MIC5249 family was designed specifically for noise-sensitive, battery-powered portable electronics-emphasizing ultra-low dropout, low quiescent current, integrated POR, and ceramic-capacitor compatibility to reduce bill-of-materials and PCB area.

FAQ

What is the minimum input voltage required for MIC5249-2.6BMM to regulate at full 300mA load?

The MIC5249-2.6BMM requires VIN ≥ VOUT + V_DROP. With a typical dropout of 340mV at 300mA, the minimum input is 2.6V + 0.34V = 2.94V. At worst-case 600mV dropout (per datasheet max), VIN must be ≥ 3.2V to guarantee regulation under all conditions. Input below 2.7V violates absolute minimum operating rating.

Does MIC5249-2.6BMM require an external pull-up resistor on the RESET pin?

Yes, MIC5249-2.6BMM features an open-drain RESET output. A pull-up resistor (typically 10kΩ to VIN or VOUT) is mandatory to establish a valid logic-high level when no fault is present. Without it, RESET remains floating and cannot signal proper power-good status to downstream logic.

Can MIC5249-2.6BMM operate without the CBYP capacitor in low-noise applications?

No-while MIC5249-2.6BMM will regulate without the CBYP capacitor, omitting the recommended 0.01µF capacitor degrades PSRR by >20dB and increases output noise significantly. For applications demanding <10µV_pp ripple (e.g., medical ADCs or RF synthesizers), the CBYP capacitor is essential to achieve specified noise performance.

What is the maximum allowable DELAY capacitor value for MIC5249-2.6BMM?

The MIC5249-2.6BMM DELAY pin has no hard upper limit, but large capacitors increase turn-on time and may conflict with system boot timing constraints. Datasheet examples use values up to 100nF (yielding ~250ms delay); beyond 220nF, delay exceeds 500ms and risks violating host processor timeout requirements. Always validate delay timing in final system.

Is MIC5249-2.6BMM compatible with X5R ceramic output capacitors?

Yes-MIC5249-2.6BMM is stable with X5R dielectric capacitors meeting the 2.2µF minimum value and ≤300mΩ ESR requirement. However, X7R is preferred for tighter capacitance retention over temperature (±15% vs. ±22% for X5R); X5R remains acceptable in commercial-temp applications where ±22% variation is tolerable.

MIC5249-2.6BMM Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Bulk

Product Status:: Discontinued at Digi-Key

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 2.6V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.6V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 200 µA

Current - Supply (Max):: -

PSRR:: 65dB (120Hz)

Control Features:: Enable, Reset

Protection Features:: Over Current, Over Temperature, Under Voltage Lockout (UVLO)

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MSOP

MIC5249-2.6BMM FAQ

1.How can I place an order for MIC5249-2.6BMM through Aetrix?

Please submit a Request for Quotation (RFQ) for MIC5249-2.6BMM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MIC5249-2.6BMM reliable?

The price and inventory of MIC5249-2.6BMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5249-2.6BMM is usually 5 days.

3.What payment methods are accepted for MIC5249-2.6BMM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5249-2.6BMM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MIC5249-2.6BMM?

MIC5249-2.6BMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MIC5249-2.6BMM order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MIC5249-2.6BMM?

For technical support, including MIC5249-2.6BMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5249-2.6BMM requirements.

6.How does Aetrix verify that MIC5249-2.6BMM is sourced from the original manufacturer or authorized distributors?

All MIC5249-2.6BMM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MIC5249-2.6BMM meets industry standards.

7.What is the process for return or replacement of MIC5249-2.6BMM?

All MIC5249-2.6BMM units undergo pre-shipment inspection (PSI). If there is an issue with MIC5249-2.6BMM, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MIC5249-2.6BMM part is unused and in its original packaging.

Return procedure for MIC5249-2.6BMM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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