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Microchip Technology MIC94345-MYMT-TR
- Part No.:
- MIC94345-MYMT-TR
- Manufacturer:
- Microchip Technology
- Package:
- 6-UFDFN Exposed Pad
- Datasheet:
-
MIC94345-MYMT-TR.pdf
- Description:
- IC REG LINEAR 2.8V 500MA 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,900
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Product details
Overview
MIC94345-MYMT-TR from Micrel is a 2.8V fixed-output, 500mA low-dropout linear regulator with Ripple Blocker™ technology for high-frequency switching noise rejection. It operates from 1.8V to 3.6V input, delivers ±1% output accuracy at 500mA load, and features logic-enable control compatible with standard GPIO levels. It is used in RF-sensitive power rails such as smartphone baseband or camera sensor supplies.
For engineers reviewing the MIC94345-MYMT-TR datasheet, MIC94345-MYMT-TR pinout, MIC94345-MYMT-TR application, or MIC94345-MYMT-TR equivalent, key selection criteria include PSRR >50dB (10Hz–5MHz), dropout voltage ≤200mV at 500mA, auto-discharge absence, 1.6mm × 1.6mm Thin DFN package, and –40°C to +125°C junction temperature operation.
Technical Context
The MIC94345-MYMT-TR implements an active ripple cancellation architecture that attenuates low-frequency switching noise from upstream DC/DC converters without requiring external compensation networks. Its internal error amplifier and pass transistor are optimized for stability with 4.7µF ceramic output capacitance and maintain >50dB PSRR across 10Hz–5MHz at full 500mA load.
This device uses CMOS-based enable logic with 1.0V logic-high threshold and integrates thermal shutdown and current-limit protection. Unlike the MIC94355 variant, it lacks auto-discharge functionality - the output remains floating when disabled, preserving hold-up time in battery-backed circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±1% - eliminates need for external feedback resistors; stable under 500mA load and line/load transients. |
| Input Voltage Range | 1.8V to 3.6V - supports single-cell Li-ion/Li-poly battery operation with headroom for voltage sag. |
| PSRR | >50dB from 10Hz to 5MHz at 500mA - suppresses switching noise from buck converters feeding RF or analog signal chains. |
| Dropout Voltage | ≤200mV at 500mA - enables high-efficiency regulation near battery minimum voltage (e.g., 2.8V out from 3.0V input). |
| Enable Threshold | Logic-high ≥1.0V, logic-low ≤0.35V - directly driven by 1.8V or 3.3V GPIO without level-shifting. |
| Operating Temperature | –40°C to +125°C junction - qualified for automotive infotainment and industrial edge computing environments. |
| Ground Current | 170–250µA at 100µA–500mA load - minimizes quiescent power loss in always-on subsystems. |
Pinout & Package
Packaged in a 1.6mm × 1.6mm, 6-pin Thin DFN (MT) with exposed thermal pad (ePad), the MIC94345-MYMT-TR uses a compact footprint optimized for space-constrained mobile PCBs. The ePad must be soldered to a ground plane for thermal performance (θJA = 92°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 5, 6) | Power input and IC supply | Accepts 1.8–3.6V; requires 4.7µF low-ESR ceramic capacitor to ground for stability and high-frequency noise filtering. |
| VOUT (Pin 1) | Regulated output | Delivers fixed 2.8V ±1%; stable with ≥4.7µF ceramic output capacitor; no auto-discharge on disable. |
| GND (Pin 3) | Reference and return path | Common ground for VIN, VOUT, EN, and ePad; must be low-impedance to minimize noise coupling. |
| EN (Pin 4) | Logic enable input | CMOS-compatible; drives output ON/OFF; must not float - tie to VOUT via pull-up if always enabled. |
| ePad | Thermal and electrical ground | Internally connected to GND; soldering to PCB ground plane reduces thermal resistance by >50%. |
Key Features
| Feature | Design Value |
|---|---|
| Ripple Blocker™ Technology | Active noise cancellation delivering >50dB PSRR from 10Hz–5MHz - replaces passive LC filters in RF power domains. |
| Ultra-Low Dropout | 200mV max at 500mA - sustains regulation down to 3.0V input for 2.8V output, extending battery runtime. |
| GPIO-Compatible Enable | 1.0V logic-high threshold - interoperable with 1.8V/3.3V microcontrollers without external level shifters. |
| Integrated Protection | Thermal shutdown and foldback current limiting - prevents damage during short-circuit or overtemperature events. |
| Small-Signal Stability | Stable with 4.7µF X5R/X7R ceramic output capacitor - eliminates need for ESR tuning or damping networks. |
Applications
| Smartphone Baseband Power | Digital Camera Sensor Rail |
|---|---|
|
Use Scenario: Clean 2.8V supply for LTE modem RF transceivers adjacent to noisy buck converters. IC Role / Device Role / Timing Role: Low-noise post-regulator rejecting switching artifacts from primary PMIC DC/DC stages. Use Value: Enables >50dB PSRR at 2.1GHz LO harmonics without adding board area or BOM cost of LC filters. |
Use Scenario: Stable 2.8V bias for CMOS image sensor analog front-end in mobile cameras. IC Role / Device Role / Timing Role: LDO providing ripple-free voltage to pixel array and ADC reference circuitry. Use Value: Reduces image noise floor by suppressing 100kHz–5MHz switching artifacts from display backlight drivers. |
| Automotive Infotainment Core Logic | Industrial IoT Wireless Module |
|
Use Scenario: Powering ARM Cortex-A7 application processor I/O rails in head-unit systems. IC Role / Device Role / Timing Role: Point-of-load regulator isolating digital core voltage from engine-bay EMI. Use Value: Maintains ±1% output accuracy across –40°C to +125°C while rejecting alternator ripple. |
Use Scenario: Supplying 2.8V to BLE/Wi-Fi SoC RF sections in battery-powered gateways. IC Role / Device Role / Timing Role: Always-on LDO enabling fast wake-from-sleep with <150µs turn-on time. Use Value: Achieves <250µA ground current at light load - extends 10-year battery life in LPWAN nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC94345-MYCS-TR | Same 2.8V output and Ripple Blocker™, but in 0.84mm × 1.32mm 6-ball CSP package - 40% smaller footprint, higher θJA (160°C/W). | Suitable for ultra-thin smartphones where board area is constrained; requires finer-pitch assembly. | Select when PCB real estate is critical and thermal margin allows higher junction temperature rise. |
| Torex XC6210B282MR-G | 2.8V fixed LDO, 500mA, PSRR 65dB @ 1kHz but only 30dB @ 1MHz; no active ripple cancellation; 1.2V–6.0V input range. | Better input voltage flexibility but inferior high-frequency noise rejection - insufficient for RF co-location. | Choose only for non-RF applications where cost is prioritized over PSRR above 100kHz. |
Compared with MIC94345-MYMT-TR, the MIC94345-MYCS-TR offers identical electrical performance in a smaller CSP package but demands tighter thermal management, while the XC6210B282MR-G provides wider input range at the expense of >20dB lower PSRR above 1MHz - making it unsuitable for RF-sensitive designs.
Availability
MIC94345-MYMT-TR is available at Aetrix Electronics and suitable for smartphone baseband power, digital camera sensor rails, and automotive infotainment core logic requiring stable component supply with guaranteed long-term availability.
Supply support for MIC94345-MYMT-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 power management, timing, and interface ICs before its acquisition by Microchip Technology in 2015. It pioneered high-PSRR LDO architectures for portable electronics.
The MIC943xx family was designed specifically for noise-sensitive RF and imaging subsystems in mobile devices, integrating active ripple cancellation to replace discrete filter solutions and reduce system-level EMI.
FAQ
What is the maximum output current rating for MIC94345-MYMT-TR?
The MIC94345-MYMT-TR is rated for continuous 500mA output current with thermal shutdown protection. At 500mA load and 2.8V output, dropout remains ≤200mV when input is ≥3.0V. Derating is required above 85°C ambient due to θJA = 92°C/W in the Thin DFN package.
Does MIC94345-MYMT-TR include auto-discharge functionality?
No, MIC94345-MYMT-TR does not include auto-discharge. When the EN pin is pulled low, the output disconnects and floats - preserving charge on downstream capacitors. For auto-discharge, select the MIC94355-MYMT-TR variant, which integrates a 50Ω discharge FET.
What input and output capacitors are required for stable operation of MIC94345-MYMT-TR?
MIC94345-MYMT-TR requires a minimum 4.7µF X5R or X7R ceramic capacitor from VIN to GND and from VOUT to GND. Low-ESR types are mandatory; Y5V dielectrics are prohibited due to capacitance loss over temperature. No feed-forward capacitor is needed - unlike the adjustable MIC94325.
What is the PSRR performance of MIC94345-MYMT-TR across frequency?
MIC94345-MYMT-TR delivers >50dB PSRR from 10Hz to 5MHz at 500mA load, as verified in the October 2012 datasheet (M9999-102512-A). At 1MHz, typical PSRR is 60dB; at 5MHz, it remains ≥50dB - significantly exceeding conventional LDOs and enabling direct replacement of LC filters.
Can MIC94345-MYMT-TR be used in automotive applications?
Yes, MIC94345-MYMT-TR is qualified for –40°C to +125°C junction temperature operation and includes thermal shutdown and current limiting - meeting AEC-Q100 stress test requirements for non-automotive-grade components. It is deployed in automotive infotainment systems where extended temperature range and noise immunity are critical.
MIC94345-MYMT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Ripple Blocker™
- Package/Case:
- 6-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 3.6V
- Voltage - Output (Min/Fixed):
- 2.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.2V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 250 µA
- Current - Supply (Max):
- -
- PSRR:
- 85dB ~ 50dB (100Hz ~ 5MHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TDFN (1.6x1.6)
MIC94345-MYMT-TR FAQ
1.How can I place an order for MIC94345-MYMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC94345-MYMT-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 MIC94345-MYMT-TR reliable?
The price and inventory of MIC94345-MYMT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC94345-MYMT-TR is usually 5 days.
3.What payment methods are accepted for MIC94345-MYMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC94345-MYMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC94345-MYMT-TR?
MIC94345-MYMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC94345-MYMT-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 MIC94345-MYMT-TR?
For technical support, including MIC94345-MYMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC94345-MYMT-TR requirements.
6.How does Aetrix verify that MIC94345-MYMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC94345-MYMT-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 MIC94345-MYMT-TR meets industry standards.
7.What is the process for return or replacement of MIC94345-MYMT-TR?
All MIC94345-MYMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC94345-MYMT-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 MIC94345-MYMT-TR part is unused and in its original packaging.
Return procedure for MIC94345-MYMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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