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Microchip Technology MIC5249-2.5BMM-TR
- Part No.:
- MIC5249-2.5BMM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC5249-2.5BMM-TR.pdf
- Description:
- IC REG LINEAR 2.5V 300MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,963
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Product details
Overview
MIC5249-2.5BMM-TR from Micrel is a 300mA, 2.5V fixed-output CMOS low-dropout (LDO) regulator with programmable power-on-reset (POR) delay and noise-reduction bypass capability. It delivers ±1.0% initial output accuracy, 340mV dropout at full load, 65dB PSRR at 120Hz, and operates from 2.7V to 6V input. Used in cellular phones and fiber-optic modules for clean, stable biasing of RF ICs and memory.
For engineers reviewing the MIC5249-2.5BMM-TR datasheet, MIC5249-2.5BMM-TR pinout, MIC5249-2.5BMM-TR application, or MIC5249-2.5BMM-TR equivalent, key selection criteria include adjustable POR delay via external capacitor, ultra-low ground current (85µA), open-drain RESET output with 89–91% VOUT undervoltage threshold, and MSOP-8 compatibility with ceramic capacitors down to 2.2µF.
Technical Context
The MIC5249-2.5BMM-TR integrates a precision bandgap reference, CMOS pass element, and active-clamp shutdown circuitry. Its POR function is implemented via a 0.55µA current source charging an external capacitor on the DELAY pin, with threshold detection at 1.4V - enabling precise reset timing independent of supply ramp rate.
It employs a noise-bypass architecture where a 0.01µF capacitor on CBYP reduces output voltage noise by shunting internal reference fluctuations. The open-drain RESET output combines undervoltage monitoring (93–96% VOUT hysteresis) with fault OR-ing (overcurrent, thermal, dropout), preventing chatter during marginal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.0% initial accuracy - ensures stable logic-level biasing for 2.5V I/O domains without external feedback. |
| Dropout Voltage | 340mV @ 300mA - enables operation from 2.84V minimum input, critical for single-cell Li-ion or dual-cell NiMH systems. |
| PSRR | 65dB @ 120Hz - suppresses ripple from switching converters feeding the LDO input, preserving signal integrity in RF sections. |
| Ground Current | 85µA @ full load - minimizes quiescent power loss in battery-powered standby modes. |
| RESET Threshold | 89–91% VOUT low, 93–96% VOUT high - provides clean, hysteresis-stabilized power-good signaling for microcontroller reset sequencing. |
| Delay Programming | External capacitor on DELAY pin with 0.55µA current source - allows user-defined POR delay from microseconds to seconds without firmware involvement. |
| Shutdown Current | 0.35µA max - enables true zero-power disable for long-term storage or deep-sleep states. |
Pinout & Package
Package: 8-pin MSOP (MM), 3.0mm × 3.0mm × 1.1mm body, exposed pad optional, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CBYP | Reference bypass node | Connects 0.01µF capacitor to GND to reduce output noise; improves PSRR and stabilizes bandgap reference. |
| 2 - DELAY | POR delay timing input | Sinks 0.55µA current; external capacitor sets RESET assertion time after VIN rise - no software dependency. |
| 3 - GND | Analog/digital ground reference | Common return for regulator core, POR comparator, and RESET driver; requires low-impedance PCB connection. |
| 4 - VIN | Main power input | Accepts 2.7V–6V; requires ≥1.0µF ceramic bypass capacitor for stability and high-frequency noise rejection. |
| 5 - VOUT | Regulated output | Delivers up to 300mA at 2.5V; stable with ≥2.2µF ceramic output capacitor (ESR ≤300mΩ). |
| 6 - NC | No-connect terminal | Internally unconnected; must remain floating - no PCB trace or component allowed. |
| 7 - RESET | Open-drain fault flag | Active-low output indicating VOUT undervoltage or fault condition; requires external pull-up to VIN or VOUT. |
| 8 - ENABLE | CMOS-compatible enable control | Logic-high (>1.6V) enables regulation; logic-low (<0.4V) forces shutdown and activates active-clamp discharge. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable POR delay | Enables deterministic system boot timing using only passive components - eliminates need for external supervisor ICs. |
| Active-clamp shutdown | Discharges output capacitor rapidly when disabled - prevents residual voltage hold-up that could interfere with downstream logic state retention. |
| Ultra-low-noise operation | CBYP pin + 0.01µF capacitor reduces broadband output noise below 20µVRMS - suitable for PLL/VCO and ADC reference supplies. |
| Stability with ceramic capacitors | Guaranteed stable with 2.2µF X7R/X5R ceramics (ESR ≤300mΩ) - eliminates bulkier tantalum or electrolytic capacitors and saves board space. |
| Zero-current shutdown mode | Reduces total system standby current to sub-microamp level - extends battery life in always-on wireless sensor nodes. |
Applications
| Cellular Phone Power Management | Fiber Optic Transceiver Biasing |
|---|---|
Use Scenario: Supplying clean 2.5V bias to baseband processor I/O banks and RF front-end ICs during dynamic transmit/receive cycles. IC Role / Device Role / Timing Role: Primary low-noise LDO delivering regulated 2.5V with POR sequencing to ensure synchronous initialization of digital and analog subsystems. Use Value: 65dB PSRR suppresses switching noise from PMIC DC-DC converters; 340mV dropout enables use of partially discharged Li-ion cells down to 2.84V. | Use Scenario: Providing stable 2.5V supply to laser diode drivers and post-amplifiers in SFP+ optical modules operating at 10Gbps. IC Role / Device Role / Timing Role: Low-noise voltage source with CBYP bypass and fast transient response to maintain signal integrity under burst-mode optical data transmission. Use Value: 0.01µF CBYP capacitor reduces output noise to <20µVRMS - prevents jitter accumulation in high-speed clock recovery circuits. |
| PDAs with Real-Time Clock Backup | Industrial Sensor Signal Conditioning |
Use Scenario: Maintaining 2.5V supply to CMOS SRAM and RTC during main power removal or brownout events. IC Role / Device Role / Timing Role: Always-on LDO with no-load stability and ultra-low shutdown current, enabling >10-year coin-cell backup operation. Use Value: 0.35µA shutdown current and guaranteed no-load regulation eliminate need for external leakage mitigation - simplifies BOM and layout. | Use Scenario: Powering precision op-amps and sigma-delta ADCs in 4–20mA loop-powered transmitters with limited headroom. IC Role / Device Role / Timing Role: High-accuracy, low-dropout regulator ensuring stable reference voltage despite wide input variation (e.g., 12–24V loop supply). Use Value: ±1.0% initial accuracy and ±3.0% over temperature guarantee consistent gain/offset calibration across industrial temperature range (–40°C to +125°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-2502E/MB | 250mA output, 600mV dropout @ full load, no integrated POR or RESET output | Lacks programmable power-on reset and fault flag - requires external supervisor for sequencing | Choose when POR functionality is unnecessary and lower cost is prioritized over feature integration |
| TCS2117-2.5 | 300mA output, 450mV dropout @ 300mA, 85dB PSRR @ 1kHz but no CBYP pin or noise reduction path | Superior high-frequency PSRR but no provision for ultra-low-noise operation - unsuitable for VCO/PLL supplies | Prefer when high-frequency ripple rejection dominates over broadband noise floor requirements |
Compared with MCP1703T-2502E/MB and TCS2117-2.5, the MIC5249-2.5BMM-TR uniquely combines programmable POR delay, open-drain RESET with hysteresis, and dedicated noise-bypass capability - making it optimal for compact, noise-sensitive, and sequenced-power systems where integration reduces component count and improves reliability.
Availability
MIC5249-2.5BMM-TR is available at Aetrix Electronics and suitable for cellular phone power management, fiber optic transceiver biasing, and industrial sensor signal conditioning requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MIC5249-2.5BMM-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, specializing in power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015.
The MIC5249-2.5BMM-TR belongs to Micrel's µCap LDO family, designed specifically for portable, battery-powered, and noise-critical applications where small size, low quiescent current, and integrated power sequencing are essential.
FAQ
What is the maximum input voltage for MIC5249-2.5BMM-TR?
The absolute maximum input voltage for MIC5249-2.5BMM-TR is +7V. However, the recommended operating range is +2.7V to +6V. Exceeding +6V risks violating thermal limits - for example, at 300mA load and 50°C ambient in MSOP-8, VIN must stay ≤4.56V to avoid thermal shutdown. Always verify power dissipation using PD = (VIN – 2.5V) × IOUT + VIN × IGND.
Does MIC5249-2.5BMM-TR require an external capacitor on the CBYP pin?
The CBYP pin on MIC5249-2.5BMM-TR is optional but strongly recommended for noise-sensitive applications: a 0.01µF capacitor to GND reduces output voltage noise and improves PSRR. Leaving CBYP open degrades noise performance but does not affect basic regulation. The pin may be left floating if ultra-low-noise operation is not required.
How is the power-on-reset delay set for MIC5249-2.5BMM-TR?
The power-on-reset delay for MIC5249-2.5BMM-TR is set by connecting an external capacitor from the DELAY pin to GND. A constant 0.55µA current charges this capacitor until it reaches 1.4V, at which point the RESET output transitions high. Delay time is calculated as TDELAY = (CDELAY × 1.4V) / 0.55µA - enabling precise, passive timing from microseconds to seconds.
What is the function of the NC pin on MIC5249-2.5BMM-TR?
Pin 6 on MIC5249-2.5BMM-TR is marked NC (No Connect) and is internally unconnected. It must remain electrically floating - no PCB trace, solder mask opening, or component should be attached. Routing to this pin or pulling it to any voltage violates the device's specified operation and may cause unpredictable behavior or parametric shift.
Can MIC5249-2.5BMM-TR operate without a load?
Yes, MIC5249-2.5BMM-TR is explicitly designed for no-load stability and remains in regulation with zero output current. This is confirmed in the datasheet's Application Information section and is critical for applications like RTC backup or CMOS RAM keep-alive, where the LDO must maintain 2.5V even when downstream circuitry is fully powered down.
MIC5249-2.5BMM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.5V
- 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
MIC5249-2.5BMM-TR FAQ
1.How can I place an order for MIC5249-2.5BMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5249-2.5BMM-TR 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 MIC5249-2.5BMM-TR reliable?
The price and inventory of MIC5249-2.5BMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5249-2.5BMM-TR is usually 5 days.
3.What payment methods are accepted for MIC5249-2.5BMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5249-2.5BMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5249-2.5BMM-TR?
MIC5249-2.5BMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5249-2.5BMM-TR 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 MIC5249-2.5BMM-TR?
For technical support, including MIC5249-2.5BMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5249-2.5BMM-TR requirements.
6.How does Aetrix verify that MIC5249-2.5BMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC5249-2.5BMM-TR 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 MIC5249-2.5BMM-TR meets industry standards.
7.What is the process for return or replacement of MIC5249-2.5BMM-TR?
All MIC5249-2.5BMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5249-2.5BMM-TR, 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 MIC5249-2.5BMM-TR part is unused and in its original packaging.
Return procedure for MIC5249-2.5BMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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