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Microchip Technology MIC5399-SSYMX-TR
- Part No.:
- MIC5399-SSYMX-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-XFDFN Exposed Pad
- Datasheet:
-
MIC5399-SSYMX-TR.pdf
- Description:
- IC REG LINEAR 3.3V/3.3V 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC5399-SSYMX-TR from Microchip Technology is a dual low-dropout linear regulator IC delivering two independent 300 mA outputs at fixed 3.3V/3.3V, with ±2% output accuracy, 160 mV dropout at full load, and operation across 2.5V–5.5V input range. It integrates output discharge circuitry and internal enable pull-down resistors for robust power sequencing in space-constrained portable electronics.
For engineers reviewing the MIC5399-SSYMX-TR datasheet, MIC5399-SSYMX-TR pinout, MIC5399-SSYMX-TR application, or MIC5399-SSYMX-TR equivalent, key selection criteria include dual-output stability with 1 µF ceramic capacitors, zero-off-state shutdown current (0.05 µA), thermal shutdown protection, and compatibility with ultra-thin 1.6 mm × 1.2 mm X2DFN packaging for high-density PCB layouts.
Technical Context
The MIC5399-SSYMX-TR implements two fully independent LDO regulators sharing only ground and package substrate-each with dedicated VIN, VOUT, and EN pins. Its architecture supports independent power inputs and enables precise rail-by-rail power management in multi-voltage systems.
It features active-high enable logic with integrated 4 MΩ pull-down resistors on both EN1 and EN2, ensuring default-off behavior during tri-state control. When disabled, the auto-discharge NFET (25 Ω typical) actively sinks current from both outputs to rapidly deplete external capacitors-critical for safe power-down sequencing in battery-powered devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V / 3.3V - eliminates external feedback network, reduces BOM count and layout area |
| Max Output Current | 300 mA per channel - supports moderate-power digital subsystems (e.g., baseband processors, sensors) |
| Dropout Voltage | 160 mV at 300 mA - enables regulation from 3.46V input down to 3.3V output, extending battery runtime |
| Accuracy | ±2% over –40°C to +125°C - ensures stable voltage delivery across industrial temperature range |
| Quiescent Current | 37 µA per LDO (typ.) - minimizes standby power loss in always-on subsystems |
| Shutdown Current | 0.05 µA (typ.) - enables true zero-power off-state for long-term storage or deep sleep modes |
| PSRR | 60 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO inputs |
| Capacitor Support | Stable with 1 µF ceramic output caps - allows use of compact, low-profile 0402/0603 MLCCs without ESR tuning |
Pinout & Package
Package: 8-Lead Extra Thin DFN (X2DFN), 1.6 mm × 1.2 mm × 0.35 mm body, exposed thermal pad (ePad) - optimized for thermal performance in ultra-thin portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4 | GND | Common analog/digital ground reference; must be connected to PCB ground plane via ePad and multiple vias |
| 2 | VOUT1 | Regulated 3.3V output for first channel; requires local 1 µF ceramic capacitor to GND |
| 3 | VOUT2 | Regulated 3.3V output for second channel; independently controllable and decoupled |
| 5 | EN2 | Active-high enable for LDO2; internal 4 MΩ pull-down ensures OFF state if left unconnected |
| 6 | VIN2 | Input supply for LDO2; accepts 2.5V–5.5V; requires local 1 µF ceramic capacitor to GND |
| 7 | VIN1 | Input supply for LDO1; electrically isolated from VIN2-enables dual-input power domain separation |
| 8 | EN1 | Active-high enable for LDO1; internal 4 MΩ pull-down prevents floating-induced turn-on |
| EP | ePad | Exposed thermal pad; must be soldered to solid GND copper area for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Independent enable & input rails | Enables flexible power sequencing-e.g., LDO1 powers core logic while LDO2 supplies I/O, each from separate battery or DC/DC sources |
| Output discharge circuit | 25 Ω internal NFET per output discharges VOUT capacitors within microseconds upon disable-prevents back-powering or latch-up in multi-rail systems |
| Internal enable pull-down | 4 MΩ resistor on EN1/EN2 guarantees defined OFF state during MCU reset or GPIO initialization-eliminates need for external pull-down resistors |
| Ultra-low quiescent current | 37 µA per LDO at no load ensures <1 µA total system standby when both channels disabled-critical for coin-cell or energy-harvesting applications |
| Thermal & current protection | Integrated thermal shutdown and 400–900 mA current limiting prevent damage during overload or short-circuit events without external components |
Applications
| Smartphone Baseband Power | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Powers application processor I/O banks and communication peripherals (UART, SPI, I²C) requiring clean, matched 3.3V rails. IC Role / Device Role / Timing Role: Dual-output LDO providing independent, low-noise 3.3V supplies with fast transient response to handle burst-mode data transfers. Use Value: Eliminates need for two discrete LDOs; output discharge prevents cross-rail coupling during sleep/wake transitions. | Use Scenario: Supplies ADC front-end, low-power microcontroller, and Bluetooth LE radio in handheld diagnostic device. IC Role / Device Role / Timing Role: Regulates two isolated 3.3V domains-one for analog signal chain, one for digital comms-with independent enable control. Use Value: Internal pull-down resistors ensure safe power-down during MCU brown-out; 1 µF capacitor support simplifies layout in tight medical enclosure. |
| Industrial Handheld Terminal | Wearable Fitness Tracker |
Use Scenario: Delivers stable 3.3V to barcode scanner module and main SoC in ruggedized field terminal operating across –25°C to +70°C ambient. IC Role / Device Role / Timing Role: Dual LDO with ±2% accuracy and –40°C to +125°C junction rating maintains regulation under wide temperature swings and battery voltage sag. Use Value: Low 160 mV dropout extends usable battery life by enabling operation down to 3.46V input; thermal shutdown protects against overheating in sealed enclosures. | Use Scenario: Powers motion sensor cluster (accelerometer, gyroscope) and BLE SoC in sub-10 mm thick wrist-worn device. IC Role / Device Role / Timing Role: Ultra-compact dual LDO in 1.6 mm × 1.2 mm X2DFN package fits constrained wearable PCB real estate. Use Value: 0.05 µA shutdown current enables multi-month shelf life; output discharge prevents residual voltage from interfering with sensor self-test routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC5399-SMYMX-TR | Fixed 3.3V/2.8V outputs instead of 3.3V/3.3V; identical package, enable/discharge features, and electrical specs otherwise | Suitable where mixed-voltage subsystems require one 3.3V rail and one 2.8V rail (e.g., memory + interface logic) | Select MIC5399-SMYMX-TR only if asymmetric voltage requirements exist; not interchangeable without schematic revision |
| TPS7A2023PDQNR | Single-channel 3.3V LDO (300 mA), 1.6V–6.0V input, ±1.5% accuracy, but no dual output or discharge circuit | Requires two units plus external enable coordination to replicate dual functionality; lacks auto-discharge | Use only when dual-channel integration is unnecessary or board space permits duplication; adds complexity in sequencing |
Compared with MIC5399-SMYMX-TR, MIC5399-SSYMX-TR delivers matched 3.3V rails ideal for symmetric I/O or dual-core architectures, while TPS7A2023PDQNR demands additional components and layout effort to achieve equivalent functionality-making MIC5399-SSYMX-TR superior for space- and BOM-sensitive dual-rail designs.
Availability
MIC5399-SSYMX-TR is available at Aetrix Electronics and suitable for smartphone baseband power, portable medical sensor hubs, industrial handheld terminals, and wearable fitness trackers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MIC5399-SSYMX-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
Microchip Technology Inc. is a leading provider of microcontrollers, analog, FPGA, and timing solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and software platforms.
The MIC5399 family is part of Microchip's precision low-power LDO portfolio, designed specifically for battery-operated portable electronics demanding dual regulated rails, ultra-low quiescent current, and reliable power sequencing in minimal footprint.
FAQ
What output voltages does the MIC5399-SSYMX-TR provide?
The MIC5399-SSYMX-TR provides two fixed, independent 3.3V outputs-VOUT1 and VOUT2-as indicated by the "SS" voltage option code in its part number. This configuration eliminates external feedback resistors and ensures matched rail performance for symmetric digital subsystems. Both outputs maintain ±2% accuracy across –40°C to +125°C junction temperature.
Does the MIC5399-SSYMX-TR require external pull-down resistors on its enable pins?
No, the MIC5399-SSYMX-TR includes internal 4 MΩ pull-down resistors on both EN1 and EN2 pins, as confirmed in the Electrical Characteristics table and Application Information section. This ensures the LDOs remain disabled during power-up, MCU reset, or floating GPIO states-removing the need for external components and reducing BOM cost and layout area.
How does the output discharge feature work on the MIC5399-SSYMX-TR?
When either EN1 or EN2 is driven low, the MIC5399-SSYMX-TR activates an internal 25 Ω NFET between the corresponding VOUT pin and GND, as specified in the Electrical Characteristics table. This auto-discharge circuit rapidly depletes external output capacitors-critical for preventing back-powering, ensuring clean power-down sequencing, and meeting functional safety requirements in portable systems.
What package type is used for the MIC5399-SSYMX-TR?
The MIC5399-SSYMX-TR uses the 8-Lead Extremely Thin DFN (X2DFN) package, measuring 1.6 mm × 1.2 mm × 0.35 mm with an exposed thermal pad (ePad). This package is explicitly identified in the Product Identification System table and Packaging Information section as "MX", distinguishing it from the thicker UDFN ("MT") variant and enabling superior thermal performance in ultra-thin form factors.
Can the MIC5399-SSYMX-TR operate with 1 µF ceramic output capacitors?
Yes-the MIC5399-SSYMX-TR is explicitly characterized and guaranteed stable with 1 µF ceramic output capacitors, as stated in the Features list and Application Information section. The design is optimized for low-ESR X5R/X7R dielectrics, and larger capacitance values do not improve stability or transient response beyond what is achieved with the recommended 1 µF value.
MIC5399-SSYMX-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-XFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 0.38V @ 300mA, 0.38V @ 300mA
- Current - Output:
- 300mA, 300mA
- Current - Quiescent (Iq):
- 55 µA
- Current - Supply (Max):
- 130 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:
- 8-DFN (1.2x1.6)
MIC5399-SSYMX-TR FAQ
1.How can I place an order for MIC5399-SSYMX-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5399-SSYMX-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 MIC5399-SSYMX-TR reliable?
The price and inventory of MIC5399-SSYMX-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5399-SSYMX-TR is usually 5 days.
3.What payment methods are accepted for MIC5399-SSYMX-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5399-SSYMX-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5399-SSYMX-TR?
MIC5399-SSYMX-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5399-SSYMX-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 MIC5399-SSYMX-TR?
For technical support, including MIC5399-SSYMX-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5399-SSYMX-TR requirements.
6.How does Aetrix verify that MIC5399-SSYMX-TR is sourced from the original manufacturer or authorized distributors?
All MIC5399-SSYMX-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 MIC5399-SSYMX-TR meets industry standards.
7.What is the process for return or replacement of MIC5399-SSYMX-TR?
All MIC5399-SSYMX-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5399-SSYMX-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 MIC5399-SSYMX-TR part is unused and in its original packaging.
Return procedure for MIC5399-SSYMX-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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