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Microchip Technology MIC5381-SSYFT-TR
- Part No.:
- MIC5381-SSYFT-TR
- Manufacturer:
- Microchip Technology
- Package:
- 6-UFQFN, 6-TMLF®
- Datasheet:
-
MIC5381-SSYFT-TR.pdf
- Description:
- IC REG LINEAR 3.3V/3.3V 6TMLF
- Quantity:
- Payment:
- Shipping:
Inventory:4,665
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Product details
Overview
MIC5381-SSYFT-TR from Micrel is a dual-channel, high-accuracy 150mA low-dropout linear regulator with independent enable control and auto-discharge functionality on both outputs. It delivers fixed 3.3V/3.3V outputs in a 6-pin 1mm × 1mm Thin MLF® package, supporting ±1% typical output accuracy, 155mV dropout at full load, and 32µA quiescent current per LDO - ideal for compact battery-powered systems requiring fast transient response and low-noise power rails.
For engineers reviewing the MIC5381-SSYFT-TR datasheet, MIC5381-SSYFT-TR pinout, MIC5381-SSYFT-TR application, or MIC5381-SSYFT-TR equivalent, key selection considerations include dual-output discharge capability, stable operation with 0402 1µF ceramic capacitors, ultra-low shutdown current (0.05µA), and thermal/current protection - all critical for portable medical devices, Bluetooth headsets, and USB-powered peripherals.
Technical Context
The MIC5381-SSYFT-TR integrates two independent CMOS-based LDO regulators with active-high enable inputs (EN1/EN2), each capable of delivering up to 150mA with 155mV dropout at rated load. Its internal auto-discharge circuit applies a 30Ω NFET load to VOUT1 and VOUT2 when disabled, ensuring rapid capacitor discharge without external components.
It operates across 2.5V–5.5V input range, maintains ±1% output accuracy over –40°C to +125°C, achieves 60dB PSRR at 1kHz, and exhibits 200µVRMS output noise (10Hz–100kHz) - enabling clean power delivery to noise-sensitive analog and RF circuitry in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V / 3.3V - eliminates external feedback resistors and simplifies layout for dual-rail applications. |
| Max Output Current | 150mA per LDO - supports moderate-power digital cores, sensors, and RF ICs without thermal derating in minimal footprint. |
| Dropout Voltage | 155mV at 150mA - enables regulation from 3.455V input to 3.3V output, maximizing battery runtime in single-cell Li-ion systems. |
| Quiescent Current | 32µA per LDO - minimizes standby power loss in always-on subsystems such as real-time clocks or keep-alive memory. |
| Auto-Discharge | 30Ω internal NFET per output - discharges output caps within microseconds upon disable, preventing back-powering or latch-up in multi-rail sequencing. |
| PSRR | 60dB at 1kHz - suppresses switching noise from upstream DC/DC converters, improving ADC SNR and RF receiver sensitivity. |
| Thermal Protection | Integrated thermal shutdown - prevents damage during sustained overload or poor PCB heat sinking in sealed enclosures. |
Pinout & Package
Package: 6-pin 1mm × 1mm Thin MLF® (RoHS-compliant, NiPdAu lead finish, halogen-free mold compound). Pin 1 identified by ▲ mark (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT1 | LDO1 regulated output | Delivers stable 3.3V to primary load; requires ≥1µF ceramic capacitor for stability. |
| 2 - VOUT2 | LDO2 regulated output | Delivers second 3.3V rail; independently controllable and auto-discharged when EN2 = low. |
| 3 - EN2 | Active-high enable for LDO2 | Logic high (≥1.2V) enables VOUT2; must not float - tie to GND or controller GPIO. |
| 4 - EN1 | Active-high enable for LDO1 | Enables VOUT1 independently; allows staggered power-up or dynamic rail disabling. |
| 5 - GND | Analog/digital ground reference | Common return path for both LDOs; requires low-impedance connection to PCB ground plane. |
| 6 - VIN | Input supply (2.5V–5.5V) | Accepts single-source input; requires 1µF ceramic decoupling capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable control | EN1/EN2 allow precise sequencing, rail isolation, and dynamic power gating without external logic. |
| Auto-discharge on both outputs | 30Ω internal discharge FET per output eliminates need for external bleed resistors in portable designs. |
| Stable with 0402 1µF ceramics | Reduces BOM count and board area - no large tantalum or electrolytic capacitors required. |
| ±1% output accuracy (typical) | Meets tight voltage tolerance requirements for 3.3V I/O interfaces, flash memory, and MCU cores. |
| Low ground current in shutdown | 0.05µA total - preserves battery life in long-term storage or deep-sleep modes. |
Applications
| Bluetooth Headset Power Management | USB Thumb Drive Controller Supply |
|---|---|
|
Use Scenario: Dual-rail power for Bluetooth radio (3.3V) and audio codec (3.3V) in ultra-thin headset housing. IC Role / Device Role / Timing Role: Dual LDO providing isolated, low-noise, sequenced 3.3V supplies with automatic discharge during sleep mode. Use Value: Eliminates external discharge resistors and reduces total solution size by >30% versus discrete LDO + FET solutions. |
Use Scenario: Powering USB 2.0 controller and NAND flash in compact flash drive with single Li-ion cell input. IC Role / Device Role / Timing Role: Dual 3.3V regulator enabling simultaneous core and I/O rail operation with fast turn-on (<125µs) and zero-cross coupling. Use Value: Maintains 3.3V compliance across full battery discharge curve (3.0V–4.2V) while minimizing standby current. |
| Medical Handheld Sensor Interface | GPS/PMP Dual-Core Power Delivery |
|
Use Scenario: Powering precision analog front-end (AFE) and low-power MCU in FDA-cleared handheld diagnostic device. IC Role / Device Role / Timing Role: Low-noise dual LDO supplying clean 3.3V rails to ADC reference and digital logic, with independent shutdown for power budgeting. Use Value: 200µVRMS noise and 60dB PSRR ensure <1 LSB error in 12-bit medical-grade data acquisition. |
Use Scenario: Providing matched 3.3V supplies to GPS baseband processor and media playback SoC in portable navigation device. IC Role / Device Role / Timing Role: Dual LDO with independent enables supporting asymmetric power states - e.g., GPS active while media idle. Use Value: Auto-discharge prevents cross-talk between powered-down and active subsystems during mode transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6223D331MR-G | Single-output 3.3V LDO (150mA); no dual channel or auto-discharge. | Requires two separate ICs to replicate MIC5381-SSYFT-TR functionality; increases PCB area and BOM count. | Select only if dual-rail integration is unnecessary and board space permits discrete implementation. |
| Ricoh RP512F331B-TR-F | Dual 3.3V/3.3V LDO (200mA each); no auto-discharge; higher quiescent current (60µA per LDO). | Lacks output discharge - external resistors needed for safe rail collapse in USB or hot-plug scenarios. | Prefer when higher output current is required and discharge timing is managed externally or not critical. |
Compared with XC6223D331MR-G and RP512F331B-TR-F, the MIC5381-SSYFT-TR uniquely combines dual 3.3V regulation, integrated auto-discharge, and ultra-low 32µA quiescent current in a 1mm² footprint - making it optimal for miniaturized, battery-sensitive applications where rail sequencing and fast shutdown are mandatory.
Availability
MIC5381-SSYFT-TR is available at Aetrix Electronics and suitable for Bluetooth headsets, USB thumb drives, and medical handheld electronics requiring stable component supply, consistent parametric performance, and long-term lifecycle support.
Supply support for MIC5381-SSYFT-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 MIC5380/1 family was designed specifically for space-constrained portable electronics needing dual, independently controlled, low-noise LDOs with minimal external components and robust protection features.
FAQ
What is the function of the auto-discharge feature in MIC5381-SSYFT-TR?
The MIC5381-SSYFT-TR integrates an internal 30Ω NFET on each output that activates automatically when EN1 or EN2 is driven low. This discharges external output capacitors rapidly - preventing back-powering of upstream circuits, eliminating need for external bleed resistors, and ensuring safe power-down sequencing in portable devices. The feature is exclusive to the MIC5381 variant and not present in MIC5380.
Can MIC5381-SSYFT-TR operate with input voltage below 2.5V?
No. The MIC5381-SSYFT-TR has a specified operating input voltage range of +2.5V to +5.5V. Operation below 2.5V violates the Absolute Maximum Ratings and may result in unregulated output, increased dropout, or failure to enable. For sub-2.5V applications, alternative LDOs with lower VIN minima must be selected.
What is the maximum junction temperature and thermal resistance of MIC5381-SSYFT-TR?
The MIC5381-SSYFT-TR has a maximum junction temperature (TJ) of +125°C and a junction-to-ambient thermal resistance (θJA) of 150°C/W in the standard 1mm × 1mm Thin MLF® package. At 150mA per LDO and 3.6V input to 3.3V output, power dissipation is ~0.18W, allowing ambient operation up to ~98°C with proper PCB copper area.
Does MIC5381-SSYFT-TR require external capacitors, and what type is recommended?
Yes - MIC5381-SSYFT-TR requires a 1µF ceramic input capacitor (X5R/X7R dielectric, 0402 size) and ≥1µF ceramic output capacitors on both VOUT1 and VOUT2. Y5V/Z5U dielectrics are not recommended due to excessive capacitance loss over temperature. The design is optimized for low-ESR ceramics; high-ESR capacitors risk instability.
How does MIC5381-SSYFT-TR differ from MIC5380-SSYFT-TR?
The MIC5381-SSYFT-TR includes auto-discharge circuitry on both outputs (activated when EN1/EN2 = low), whereas MIC5380-SSYFT-TR lacks this feature. Both share identical pinout, package, output voltages (3.3V/3.3V), accuracy, and current capability. The MIC5381-SSYFT-TR marking code "MK" distinguishes it from MIC5380's "S2" code.
MIC5381-SSYFT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 6-UFQFN, 6-TMLF®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 2
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V, 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.31V @ 150mA, 0.31V @ 150mA
- Current - Output:
- 150mA, 150mA
- Current - Quiescent (Iq):
- 45 µA
- Current - Supply (Max):
- 85 µA
- PSRR:
- 60dB (1kHz)
- 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-TMLF® (1x1)
MIC5381-SSYFT-TR FAQ
1.How can I place an order for MIC5381-SSYFT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5381-SSYFT-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 MIC5381-SSYFT-TR reliable?
The price and inventory of MIC5381-SSYFT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5381-SSYFT-TR is usually 5 days.
3.What payment methods are accepted for MIC5381-SSYFT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5381-SSYFT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5381-SSYFT-TR?
MIC5381-SSYFT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5381-SSYFT-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 MIC5381-SSYFT-TR?
For technical support, including MIC5381-SSYFT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5381-SSYFT-TR requirements.
6.How does Aetrix verify that MIC5381-SSYFT-TR is sourced from the original manufacturer or authorized distributors?
All MIC5381-SSYFT-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 MIC5381-SSYFT-TR meets industry standards.
7.What is the process for return or replacement of MIC5381-SSYFT-TR?
All MIC5381-SSYFT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5381-SSYFT-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 MIC5381-SSYFT-TR part is unused and in its original packaging.
Return procedure for MIC5381-SSYFT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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