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Microchip Technology MIC5503-1.8YMT-TR
- Part No.:
- MIC5503-1.8YMT-TR
- Manufacturer:
- Microchip Technology
- Package:
- 4-UDFN Exposed Pad
- Datasheet:
-
MIC5503-1.8YMT-TR.pdf
- Description:
- IC REG LINEAR 1.8V 300MA 4TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,125
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Product details
Overview
MIC5503-1.8YMT-TR from Microchip Technology is a 300 mA, fixed 1.8 V output low-dropout linear regulator in a 4-lead 1.0 mm × 1.0 mm thin DFN package, featuring ±2% output accuracy, 160 mV dropout at full load, and internal enable pull-down for reliable disable during processor boot-up. It powers core logic rails in space-constrained portable electronics requiring stable low-voltage bias under variable load and input conditions.
For engineers reviewing the MIC5503-1.8YMT-TR datasheet, MIC5503-1.8YMT-TR pinout, MIC5503-1.8YMT-TR application, or MIC5503-1.8YMT-TR equivalent, key selection criteria include guaranteed 300 mA output current with 38 μA quiescent current, stability with 1 μF ceramic output capacitors, thermal shutdown protection, and compatibility with 2.5–5.5 V input systems.
Technical Context
The MIC5503-1.8YMT-TR implements a CMOS-based LDO architecture with active-high enable control and an integrated 4 MΩ pull-down resistor on the EN pin-ensuring default-off behavior when control signals float. Its regulation loop maintains 1.8 V output across –40°C to +125°C junction temperature with ≤3.0% total variation over temperature and load.
Designed for battery-powered systems, it achieves low-noise operation (175 μVRMS, 10 Hz–100 kHz) and high PSRR (60 dB at 1 kHz), while supporting zero-off-mode current (<1 μA shutdown current) and load transient recovery within 100 μs. It is not suitable for RF transmitter applications per manufacturer specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% initial accuracy; ensures precise core voltage for 1.8 V I/O or logic domains. |
| Max Output Current | 300 mA guaranteed; supports microcontroller cores, sensors, and low-power peripherals without derating. |
| Dropout Voltage | 160 mV @ 300 mA; enables operation down to 1.96 V input, critical for single-cell Li-ion or Li-poly systems. |
| Quiescent Current | 38 μA typical @ no load; minimizes standby power loss in always-on subsystems. |
| Input Voltage Range | 2.5 V to 5.5 V; compatible with common intermediate rails (3.3 V, 5 V) and wide-input battery systems. |
| Thermal Protection | Integrated thermal shutdown and current limiting; prevents damage during sustained overload or poor PCB heatsinking. |
| Capacitor Support | Stable with ≥1 μF X5R/X7R ceramic output capacitor; eliminates need for large tantalum or electrolytic parts. |
Pinout & Package
Package: 4-Lead 1.0 mm × 1.0 mm Thin DFN (MT), exposed thermal pad (ePAD) to be connected to GND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 4) | Supply Input | Accepts 2.5–5.5 V input; requires 1 μF ceramic bypass capacitor to GND for stability. |
| EN (Pin 3) | Enable Input | Active-high logic control; internal 4 MΩ pull-down ensures safe disable if left floating-ideal for uncontrolled boot sequences. |
| VOUT (Pin 1) | Regulated Output | Delivers fixed 1.8 V; stable with 1 μF ceramic output capacitor; no auto-discharge circuit (unlike MIC5502/4). |
| GND (Pin 2) | Ground Reference | Power and signal return path; must be connected to ePAD for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Enable Pull-Down | 4 MΩ resistor on EN pin ensures deterministic OFF state during processor reset or floating control lines. |
| Ultra-Small Footprint | 1.0 mm × 1.0 mm DFN package saves >70% board area vs. SOT23-5, enabling dense portable PCB layouts. |
| Low Dropout Performance | 160 mV dropout at 300 mA allows extended battery runtime in 2-cell or single-cell Li-ion systems. |
| No-Load Stability | Maintains regulation with zero load-critical for backup rails powering RTC or SRAM keep-alive circuits. |
| Robust Protection Suite | Thermal shutdown + foldback current limit prevent latch-up or destruction during short-circuit or overtemperature events. |
Applications
| Smartphone Core Logic Rail | Portable Medical Sensor Node |
|---|---|
Use Scenario: Powers 1.8 V I/O banks and low-power MCU peripherals in compact smartphone mainboard designs. IC Role / Device Role / Timing Role: Primary voltage regulator for application processor I/O domain, delivering clean, stable 1.8 V under dynamic load transitions. Use Value: Enables direct use of 1 μF ceramic capacitors and eliminates need for external pull-down resistors on EN, reducing BOM count and layout complexity. |
Use Scenario: Supplies regulated 1.8 V to ultra-low-power biosensor ICs and BLE radio interfaces in wearable ECG patches. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current LDO ensuring accurate analog front-end biasing and RF receiver sensitivity. Use Value: 38 μA quiescent current extends battery life in multi-week wearable deployments; ±2% accuracy maintains sensor calibration integrity. |
| Industrial Handheld Terminal | Automotive Infotainment Subsystem |
Use Scenario: Provides 1.8 V supply to FPGA configuration memory and display interface logic in ruggedized handheld scanners. IC Role / Device Role / Timing Role: Secondary LDO for non-critical digital subsystems, operating across –40°C to +125°C ambient range. Use Value: Guaranteed 300 mA output and thermal shutdown ensure reliability in high-temperature industrial enclosures without forced airflow. |
Use Scenario: Powers 1.8 V camera image signal processors (ISP) and touch controller interfaces in automotive infotainment head units. IC Role / Device Role / Timing Role: Dedicated low-noise regulator isolating sensitive imaging circuits from noisy 3.3 V or 5 V system rails. Use Value: 60 dB PSRR at 1 kHz suppresses switching noise from adjacent DC/DC converters, preventing image artifacts or touch jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC5504-1.8YMT-TR | Includes both EN pull-down and auto-discharge circuit; higher ground current (42 μA @ 300 mA) vs. MIC5503's 38 μA. | Required where rapid output discharge after shutdown is needed (e.g., to meet fast power-down sequencing). | Select MIC5504 only if auto-discharge is mandatory; otherwise MIC5503 reduces ground current and simplifies design. |
| Torex XC6210B182MR-G | Same 1.8 V output, 300 mA rating, and 1.0 mm × 1.0 mm DFN package; but lacks internal EN pull-down (requires external resistor). | Suitable for systems with actively driven EN signals; not recommended for floating-control scenarios like MCU boot-up. | Choose XC6210B182MR-G only when EN is always driven; MIC5503 avoids risk of indeterminate state with unconnected EN. |
Compared with MIC5504-1.8YMT-TR and XC6210B182MR-G, the MIC5503-1.8YMT-TR uniquely balances guaranteed 300 mA delivery, ultra-low 38 μA quiescent current, and intrinsic EN pull-down-making it optimal for cost-sensitive, space-constrained portable designs where control signal integrity cannot be assumed.
Availability
MIC5503-1.8YMT-TR is available at Aetrix Electronics and suitable for smartphone power management, portable medical devices, and industrial handheld terminals requiring stable component supply with full RoHS compliance and traceable lot data.
Supply support for MIC5503-1.8YMT-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 components, and timing solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The MIC5503-1.8YMT-TR belongs to Microchip's MIC550x family of ultra-small, high-performance LDOs designed specifically for battery-powered portable electronics demanding low quiescent current, tight output accuracy, and robust thermal protection.
FAQ
What is the maximum input voltage rating for the MIC5503-1.8YMT-TR?
The MIC5503-1.8YMT-TR has an absolute maximum input voltage rating of +6 V, but its specified operating input range is +2.5 V to +5.5 V. Operation outside this range may cause permanent damage or unpredictable behavior. For reliable long-term performance, VIN must remain within 2.5–5.5 V during normal operation, as confirmed in the DS20006006B datasheet Section 1.0 Electrical Characteristics.
Does the MIC5503-1.8YMT-TR include an auto-discharge function on the output pin?
No, the MIC5503-1.8YMT-TR does not include an auto-discharge circuit. That feature is exclusive to MIC5502 and MIC5504 variants. The MIC5503-1.8YMT-TR provides internal EN pull-down but leaves VOUT floating when disabled-requiring external discharge paths if rapid voltage decay is needed. This distinction is explicitly stated in the General Description and Pin Descriptions sections of DS20006006B.
What is the thermal resistance (θJA) of the MIC5503-1.8YMT-TR package?
The MIC5503-1.8YMT-TR uses the 4-lead 1.0 mm × 1.0 mm Thin DFN (MT) package, which has a junction-to-ambient thermal resistance (θJA) of 250°C/W under standard JEDEC test conditions. This value assumes proper PCB layout with the ePAD soldered to a minimum 100 mm² copper pour connected to GND, as detailed in Section 4.5 Thermal Considerations of DS20006006B.
Can the MIC5503-1.8YMT-TR operate with zero load current?
Yes, the MIC5503-1.8YMT-TR remains stable and in regulation with no load-a key differentiator from many legacy LDOs. This capability is essential for applications such as CMOS RAM keep-alive circuits or always-on sensor bias rails. The datasheet confirms no-load stability in Section 4.3 and specifies ground current as low as 38 μA at IOUT = 0 mA.
What capacitor types are recommended for the MIC5503-1.8YMT-TR output?
X5R or X7R dielectric ceramic capacitors are recommended for the MIC5503-1.8YMT-TR output, with a minimum value of 1 μF. These offer stable capacitance over temperature (±15% for X7R) and low ESR, ensuring loop stability. Y5V and Z5U dielectrics are explicitly discouraged due to >50% capacitance loss over temperature, per Section 4.2 Output Capacitor in DS20006006B.
MIC5503-1.8YMT-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 4-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.38V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 55 µA
- Current - Supply (Max):
- 65 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:
- 4-TDFN (1x1)
MIC5503-1.8YMT-TR FAQ
1.How can I place an order for MIC5503-1.8YMT-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5503-1.8YMT-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 MIC5503-1.8YMT-TR reliable?
The price and inventory of MIC5503-1.8YMT-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5503-1.8YMT-TR is usually 5 days.
3.What payment methods are accepted for MIC5503-1.8YMT-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5503-1.8YMT-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5503-1.8YMT-TR?
MIC5503-1.8YMT-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5503-1.8YMT-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 MIC5503-1.8YMT-TR?
For technical support, including MIC5503-1.8YMT-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5503-1.8YMT-TR requirements.
6.How does Aetrix verify that MIC5503-1.8YMT-TR is sourced from the original manufacturer or authorized distributors?
All MIC5503-1.8YMT-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 MIC5503-1.8YMT-TR meets industry standards.
7.What is the process for return or replacement of MIC5503-1.8YMT-TR?
All MIC5503-1.8YMT-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5503-1.8YMT-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 MIC5503-1.8YMT-TR part is unused and in its original packaging.
Return procedure for MIC5503-1.8YMT-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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