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Microchip Technology MIC5399-SMYMX-TR
- Part No.:
- MIC5399-SMYMX-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-XFDFN Exposed Pad
- Datasheet:
-
MIC5399-SMYMX-TR.pdf
- Description:
- IC REG LINEAR 2.8V/3.3V 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,999
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Product details
Overview
MIC5399-SMYMX-TR from Microchip Technology is a dual low-dropout linear regulator (LDO) with independent 300 mA outputs, fixed output voltages of 3.3 V and 2.8 V, ±2% output accuracy, and 160 mV dropout at full load. It features output discharge circuitry and internal enable pull-down resistors, making it suitable for battery-powered portable electronics requiring fast power sequencing and clean shutdown behavior.
For engineers reviewing the MIC5399-SMYMX-TR datasheet, MIC5399-SMYMX-TR pinout, MIC5399-SMYMX-TR application, or MIC5399-SMYMX-TR equivalent, this page delivers verified electrical parameters, validated package dimensions, confirmed dual-LDO functional behavior, and real-world design implications for portable power management systems.
Technical Context
The MIC5399-SMYMX-TR integrates two fully independent LDO regulators sharing only ground and thermal paths. Each channel supports separate input supplies (VIN1/VIN2), active-high enables (EN1/EN2), and dedicated outputs (VOUT1/VOUT2), enabling asymmetric voltage rail generation and independent power control.
It implements an auto-discharge NFET (25 Ω typical) activated on disable for both outputs and includes internal 4 MΩ pull-down resistors on EN1/EN2-features exclusive to the MIC5399 variant within the family. These ensure deterministic off-state behavior without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V (VOUT1) and 2.8 V (VOUT2), factory-fixed - eliminates external feedback network and simplifies BOM for dual-rail systems. |
| Output Current | 300 mA per channel - supports moderate-power digital ICs (e.g., baseband processors, RF front-end biasing) without thermal derating in compact layouts. |
| Dropout Voltage | 160 mV at 300 mA - enables stable regulation from 3.46 V input for 3.3 V rail and 2.96 V input for 2.8 V rail, maximizing battery utilization. |
| Ground Current | 74 µA typical (both LDOs enabled, no load) - minimizes quiescent power loss critical for always-on subsystems in portable devices. |
| PSRR | 60 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters, protecting noise-sensitive analog or RF circuitry. |
| Operating Temp | –40°C to +125°C junction - qualified for extended industrial and automotive cabin environments without derating. |
| Input Voltage | 2.5 V to 5.5 V - compatible with single-cell Li-ion (2.7–4.2 V), Li-polymer, and regulated 3.3 V/5 V system rails. |
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 space-constrained PCBs and high thermal conductivity via ePad soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4 | GND | Common analog/digital ground reference for both LDOs and ePad thermal path - must be low-impedance connection to PCB ground plane. |
| 2 | VOUT1 | 3.3 V regulated output - requires ≥1 µF ceramic capacitor to ground for stability; feeds primary logic rail or PMIC input. |
| 3 | VOUT2 | 2.8 V regulated output - requires ≥1 µF ceramic capacitor to ground; commonly powers RF transceivers or sensor interfaces. |
| 5 | EN2 | Active-high enable for VOUT2 - internal 4 MΩ pull-down ensures safe default-off state if left unconnected or tri-stated. |
| 6 | VIN2 | Input supply for VOUT2 - supports independent sourcing (e.g., separate battery tap or DC/DC output) to optimize efficiency per rail. |
| 7 | VIN1 | Input supply for VOUT1 - decoupled from VIN2 to prevent cross-regulation during transient load events on either output. |
| 8 | EN1 | Active-high enable for VOUT1 - internal 4 MΩ pull-down guarantees reliable disable when control signal is absent. |
| EP | ePad | Exposed thermal pad - must be soldered to solid copper ground plane for thermal performance (θJA = 172.6°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Independent power inputs | Enables dual-input architectures (e.g., battery + USB VBUS) to maximize efficiency and avoid backfeed between rails. |
| Output discharge circuit | 25 Ω internal NFET per output - discharges output capacitors within microseconds upon disable, preventing residual voltage hold-up in sequenced systems. |
| Internal enable pull-down | 4 MΩ resistor on EN1/EN2 - eliminates need for external pull-downs, reducing component count and board area in space-critical designs. |
| Stable with 1 µF ceramic caps | Eliminates requirement for large bulk capacitors - reduces solution size and cost while maintaining phase margin across temperature and load. |
| Thermal shutdown & current limit | Protects against sustained overloads (ILIM = 400–900 mA) and ambient overheating (TJ > +125°C), ensuring robust field reliability. |
Applications
| Smartphone Power Management | Portable Medical Sensor Hub |
|---|---|
Use Scenario: Dual-rail power delivery to application processor (3.3 V I/O) and cellular modem (2.8 V analog supply) with coordinated startup/shutdown. IC Role / Device Role / Timing Role: Primary dual-output LDO providing clean, sequenced, and discharged power rails under host processor control. Use Value: Eliminates need for discrete discharge FETs and pull-down resistors, reducing BOM count by ≥4 passive components per rail. |
Use Scenario: Powering low-noise analog front-end (2.8 V) and digital controller (3.3 V) in handheld ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current dual LDO delivering stable rails during battery-operated, long-duration monitoring cycles. Use Value: 60 dB PSRR at 1 kHz and 93 µVRMS output noise preserve signal integrity in sub-µV biomedical measurements. |
| DSC/GPS Portable Navigation Unit | Industrial Handheld Scanner |
Use Scenario: Supplying image sensor interface (3.3 V) and GPS baseband IC (2.8 V) from shared Li-ion battery with tight thermal envelope. IC Role / Device Role / Timing Role: Compact dual LDO managing independent voltage domains while minimizing self-heating in sealed enclosures. Use Value: 1.6 mm × 1.2 mm X2DFN package and 172.6°C/W θJA enable operation up to +68°C ambient at full 300 mA load per rail. |
Use Scenario: Powering barcode decoder ASIC (3.3 V) and laser driver (2.8 V) in ruggedized handheld scanners with frequent on/off cycling. IC Role / Device Role / Timing Role: Sequenced dual LDO with fast turn-on (50 µs typical) and automatic output discharge for rapid wake/sleep transitions. Use Value: 50 µs tON and 25 Ω discharge path reduce wake latency and eliminate floating rail issues during intermittent operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC5397-GPYMX-TR | Same 1.8 V/3.0 V outputs, output discharge circuit, but no internal enable pull-down - requires external 4.7 MΩ pull-downs on EN pins. | Lacks guaranteed tri-state safety; unsuitable where MCU GPIOs may float during reset or sleep modes. | Select when fixed 1.8 V/3.0 V rails are required and external pull-downs are acceptable for cost or legacy design reuse. |
| MIC5398-P4YMX-TR | Same 3.0 V/1.2 V outputs and internal enable pull-down, but no output discharge circuit - cannot actively discharge output caps on disable. | Cannot meet fast-rail-collapse requirements in systems needing controlled power-down sequencing (e.g., FPGA configuration retention). | Select when lower-voltage rails (1.2 V core) dominate and discharge is handled externally or not required. |
Compared with MIC5397-GPYMX-TR and MIC5398-P4YMX-TR, the MIC5399-SMYMX-TR uniquely combines 3.3 V/2.8 V fixed outputs, output discharge, and internal enable pull-down - delivering the highest level of integration and safety for portable dual-rail systems without external support components.
Availability
MIC5399-SMYMX-TR is available at Aetrix Electronics and suitable for smartphone power management, portable medical sensor hubs, and industrial handheld scanners requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MIC5399-SMYMX-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 is a global provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving industrial, automotive, consumer, and communications markets with high-reliability semiconductor products.
The MIC5399 belongs to Microchip's low-power dual LDO product line, designed specifically for space- and power-constrained portable electronics that demand independent, sequenced, and cleanly discharged voltage rails from a single compact package.
FAQ
What are the fixed output voltages of the MIC5399-SMYMX-TR?
The MIC5399-SMYMX-TR provides factory-set output voltages of 3.3 V on VOUT1 and 2.8 V on VOUT2. These values are non-adjustable and defined by the "SM" voltage option code in the part number. The device does not support external feedback resistors or programmable output configurations.
Does the MIC5399-SMYMX-TR require external pull-down resistors on its enable pins?
No. The MIC5399-SMYMX-TR includes internal 4 MΩ pull-down resistors on both EN1 and EN2 pins, ensuring the outputs remain disabled when the enable signals are left unconnected or driven to high-impedance states. This eliminates the need for external pull-down components in most designs.
How does the output discharge feature work in the MIC5399-SMYMX-TR?
When either EN1 or EN2 is driven low, the corresponding LDO output is disabled and an internal 25 Ω NFET connects the output to GND, actively discharging the output capacitor. This behavior is confirmed in the Electrical Characteristics table (RDS(ON) = 25 Ω) and applies to both VOUT1 and VOUT2 in the MIC5399-SMYMX-TR.
What is the minimum input voltage required for stable operation of the MIC5399-SMYMX-TR?
The MIC5399-SMYMX-TR requires a minimum input voltage of 2.5 V on VIN1 and VIN2. For stable 3.3 V output, VIN1 must exceed 3.46 V (3.3 V + 160 mV dropout); for stable 2.8 V output, VIN2 must exceed 2.96 V. Input voltage can range up to 5.5 V per channel.
Is the MIC5399-SMYMX-TR compatible with 1 µF ceramic output capacitors?
Yes. The MIC5399-SMYMX-TR is explicitly characterized and guaranteed stable with ≥1 µF X5R/X7R ceramic output capacitors, as stated in the General Description and Application Information sections. Larger capacitances do not improve stability or transient response beyond the 1 µF baseline design point.
MIC5399-SMYMX-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):
- 2.8V, 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-SMYMX-TR FAQ
1.How can I place an order for MIC5399-SMYMX-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5399-SMYMX-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-SMYMX-TR reliable?
The price and inventory of MIC5399-SMYMX-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-SMYMX-TR is usually 5 days.
3.What payment methods are accepted for MIC5399-SMYMX-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5399-SMYMX-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5399-SMYMX-TR?
MIC5399-SMYMX-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5399-SMYMX-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-SMYMX-TR?
For technical support, including MIC5399-SMYMX-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5399-SMYMX-TR requirements.
6.How does Aetrix verify that MIC5399-SMYMX-TR is sourced from the original manufacturer or authorized distributors?
All MIC5399-SMYMX-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-SMYMX-TR meets industry standards.
7.What is the process for return or replacement of MIC5399-SMYMX-TR?
All MIC5399-SMYMX-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5399-SMYMX-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-SMYMX-TR part is unused and in its original packaging.
Return procedure for MIC5399-SMYMX-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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