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Microchip Technology MIC5245-3.3BMM-TR
- Part No.:
- MIC5245-3.3BMM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC5245-3.3BMM-TR.pdf
- Description:
- IC REG LINEAR 3.3V 150MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
MIC5245-3.3BMM-TR from Micrel is a fixed-output 3.3V, 150mA ultra-low-noise CMOS LDO regulator in MSOP-8 package, featuring 30µV(rms) output noise, 150mV dropout at 100mA, and TTL-compatible enable input - optimized for RF power stages and battery-powered portable electronics requiring clean, stable voltage rails.
For engineers reviewing the MIC5245-3.3BMM-TR datasheet, MIC5245-3.3BMM-TR pinout, MIC5245-3.3BMM-TR application, or MIC5245-3.3BMM-TR equivalent, key selection criteria include its 30µV(rms) noise performance, active shutdown with near-zero off-mode current (≤1µA), MSOP-8 thermal resistance (θJA = 80°C/W), and compatibility with low-ESR ceramic output capacitors down to 1µF.
Technical Context
The MIC5245-3.3BMM-TR employs a P-channel MOSFET pass device with N-channel clamp for fast transient recovery and active shutdown discharge. Its reference bypass (BYP) pin supports external 0.01µF capacitor to reduce noise, and its enable input is CMOS-compatible with logic-high activation (VIH ≥ 2.0V) and defined hysteresis.
It operates across –40°C to +125°C junction temperature, requires no input capacitor for stability, and maintains constant ground current (~100µA) independent of load - enabling predictable power budgeting in space-constrained handheld designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% initial accuracy - ensures precise rail generation without external feedback components. |
| Max Output Current | 150mA continuous - sufficient for powering RF front-ends, baseband processors, and low-power microcontrollers. |
| Dropout Voltage | 150mV @ 100mA - enables operation from 3.45V input when delivering full rated load, critical for single-cell Li-ion systems. |
| Output Noise | 30µV(rms), 10Hz–100kHz - meets stringent RF supply cleanliness requirements without additional filtering. |
| Ground Current | 100µA typical, load-independent - simplifies battery life estimation and eliminates quiescent current variation with load changes. |
| Enable Threshold | VIL ≤ 0.4V (shutdown), VIH ≥ 2.0V (enable) - compatible with standard 3.3V/5V logic families without level-shifting. |
| Thermal Resistance | θJA = 80°C/W (MSOP-8) - supports higher power dissipation than SOT-23-5 (235°C/W), enabling 150mA operation at elevated ambient temperatures. |
Pinout & Package
Package: MSOP-8 (BMM), 3.0mm × 3.0mm × 0.85mm body, exposed pad optional, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Supply Input | Regulator input; accepts 2.7V–6V; must be decoupled locally if >10 inches from bulk source. |
| 2, 3, 4, 6 (GND) | Ground Return | Four dedicated GND pins minimize ground impedance and improve PSRR/noise rejection. |
| 5 (EN) | Enable/Shutdown Input | CMOS-compatible active-high control; must not float; pulls output to zero current when low. |
| 7 (BYP) | Noise Bypass | Connects to internal reference; 0.01µF to GND reduces output noise by >20dB in RF-sensitive applications. |
| 8 (OUT) | Regulated Output | 3.3V output; requires ≥1µF ceramic capacitor (X7R recommended) for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow noise output | 30µV(rms) with 0.01µF BYP capacitor - eliminates need for post-regulator LC filters in cellular transceivers. |
| Active shutdown clamp | N-channel MOSFET discharges output capacitor on disable - prevents residual voltage hold-up on powered-down subsystems. |
| Load-independent ground current | ~100µA across 0–150mA load - enables accurate battery runtime modeling without iterative current profiling. |
| Fast transient recovery | Totem-pole output stage with P-ch pass + N-ch clamp - recovers from 100µA ↔ 150mA load steps in <10µs with <50mV droop/overshoot. |
| Stability with ceramic capacitors | Works with ≥1µF X7R ceramics - avoids tantalum cost, size, and reliability concerns in high-volume portable designs. |
Applications
| Cellular Transceiver Power Supply | Laptop Baseband Core Rail |
|---|---|
Use Scenario: Providing clean 3.3V bias to RF power amplifier and mixer stages in 3G/4G LTE handsets. IC Role / Device Role / Timing Role: Ultra-low-noise LDO regulator supplying analog RF circuitry where supply ripple directly modulates carrier signal. Use Value: 30µV(rms) noise floor prevents reciprocal mixing and adjacent channel interference, maintaining EVM <2.5% at 20MHz bandwidth. | Use Scenario: Delivering stable 3.3V core voltage to baseband processor I/O and memory interfaces in ultraportable notebooks. IC Role / Device Role / Timing Role: Low-dropout linear regulator with fast load transient response supporting burst-mode CPU activity. Use Value: 150mV dropout and sub-10µs recovery ensure uninterrupted operation during 100µA ↔ 150mA dynamic current swings, preventing timing violations. |
| PCMCIA VCC Regulation | SMPS Post-Regulator |
Use Scenario: Regulating 3.3V VCC for PCMCIA card slots in industrial data acquisition modules. IC Role / Device Role / Timing Role: Enable-controlled LDO ensuring hot-swap safe power sequencing and zero-current standby. Use Value: TTL-compatible EN pin allows direct connection to host controller GPIO; "zero" off-mode current (<1µA) meets PCMCIA power-down compliance. | Use Scenario: Tightening output regulation and reducing ripple from switching DC-DC converters in medical sensor modules. IC Role / Device Role / Timing Role: Linear post-regulator suppressing high-frequency switching noise above 100kHz. Use Value: 50dB PSRR at 120Hz and >40dB up to 1MHz suppresses SMPS ripple, meeting IEC 60601-1 conducted emission limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC5255-3.3YM5 | Successor device; improved PSRR (65dB @ 120Hz), lower IQ (50µA), same 3.3V/150mA spec but in SOT-23-5. | SOT-23-5 footprint vs. MSOP-8; lacks four-GND layout advantage for noise-sensitive layouts. | Select MIC5255-3.3YM5 only if board space is constrained and thermal load is light; MIC5245-3.3BMM-TR preferred for RF noise immunity and thermal margin. |
| TSS721AIDR | TI part; 3.3V/250mA, 200mV dropout @ 150mA, 45µV(rms) noise, SOIC-8 package, no BYP pin. | No noise-bypass capability; higher noise and dropout limit use in high-efficiency RF sections. | Choose TSS721AIDR only for non-RF applications where higher output current and SOIC-8 assembly compatibility outweigh noise/dropout penalties. |
Compared with MIC5255-3.3YM5 and TSS721AIDR, the MIC5245-3.3BMM-TR delivers superior RF noise performance (30µV vs. 45µV) and better thermal handling (80°C/W vs. 235°C/W), making it the optimal choice for compact, thermally demanding, noise-critical portable RF designs despite being legacy-marked.
Availability
MIC5245-3.3BMM-TR is available at Aetrix Electronics and suitable for cellular transceivers, laptop baseband power, PCMCIA VCC regulation, and SMPS post-regulation requiring stable component supply with long-term industrial lifecycle support.
Supply support for MIC5245-3.3BMM-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 semiconductor company specializing in analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC5245 product line was designed for ultra-low-noise, battery-efficient portable electronics - emphasizing precision regulation, minimal quiescent current, and RF-grade supply cleanliness in miniature packages.
FAQ
What is the maximum input voltage for MIC5245-3.3BMM-TR?
The absolute maximum input voltage for MIC5245-3.3BMM-TR is +7V, but the recommended operating range is +2.7V to +6V per datasheet specifications. Exceeding +6V risks violating safe operating area limits, especially under full 150mA load and elevated temperature. The MIC5245-3.3BMM-TR achieves optimal dropout and thermal performance between 3.45V and 5.4V input when delivering 150mA at 3.3V output.
Does MIC5245-3.3BMM-TR require an input capacitor?
No, MIC5245-3.3BMM-TR does not require an input capacitor for stability. However, a 1µF ceramic capacitor is recommended when the bulk supply is located more than 10 inches from the device or when powered from a battery with high source impedance. This improves transient response and reduces input ripple coupling - a design consideration explicitly documented for MIC5245-3.3BMM-TR in Micrel's Applications Information section.
Can MIC5245-3.3BMM-TR operate with a 1µF ceramic output capacitor?
Yes, MIC5245-3.3BMM-TR is fully stable with a minimum 1µF X7R ceramic output capacitor, as confirmed in the datasheet's Applications Information and Typical Characteristics. It is specifically optimized for low-ESR ceramic capacitors - unlike many older LDOs requiring tantalum - and supports capacitor values beyond 1µF without stability risk. This capability is a verified feature of MIC5245-3.3BMM-TR and enables smaller, more reliable power designs.
What is the purpose of the BYP pin on MIC5245-3.3BMM-TR?
On MIC5245-3.3BMM-TR, the BYP (pin 7) connects to the internal voltage reference and provides a dedicated node for external noise reduction. Connecting a 0.01µF capacitor from BYP to GND shunts high-frequency reference noise, lowering total output noise from ~45µV(rms) to the specified 30µV(rms). This function is unique to MIC5245-3.3BMM-TR among its voltage variants and is essential for RF and precision analog applications.
Is MIC5245-3.3BMM-TR pin-compatible with other MIC5245 variants?
MIC5245-3.3BMM-TR uses the MSOP-8 (BMM) package with eight pins and four GND terminals, while SOT-23-5 variants (e.g., MIC5245-3.3BM5) have five pins and different pinout - they are not pin-compatible. The MIC5245-3.3BMM-TR pin mapping (IN, GND×4, EN, BYP, OUT) is exclusive to the MSOP-8 variant and must be laid out separately. No drop-in replacement exists between BMM and BM5 packages.
MIC5245-3.3BMM-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):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.25V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- 50dB (120Hz)
- Control Features:
- Enable
- 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
MIC5245-3.3BMM-TR FAQ
1.How can I place an order for MIC5245-3.3BMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5245-3.3BMM-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 MIC5245-3.3BMM-TR reliable?
The price and inventory of MIC5245-3.3BMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5245-3.3BMM-TR is usually 5 days.
3.What payment methods are accepted for MIC5245-3.3BMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5245-3.3BMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5245-3.3BMM-TR?
MIC5245-3.3BMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5245-3.3BMM-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 MIC5245-3.3BMM-TR?
For technical support, including MIC5245-3.3BMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5245-3.3BMM-TR requirements.
6.How does Aetrix verify that MIC5245-3.3BMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC5245-3.3BMM-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 MIC5245-3.3BMM-TR meets industry standards.
7.What is the process for return or replacement of MIC5245-3.3BMM-TR?
All MIC5245-3.3BMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5245-3.3BMM-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 MIC5245-3.3BMM-TR part is unused and in its original packaging.
Return procedure for MIC5245-3.3BMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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