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Texas Instruments LM1086ILD-3.3
- Part No.:
- LM1086ILD-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
LM1086ILD-3.3.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,494
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Product details
Overview
LM1086ILD-3.3 from Texas Instruments is a fixed-output 3.3-V, 1.5-A low-dropout linear voltage regulator in WSON-8 package with 1.5-V dropout at full load, ±2% output accuracy, and operation from −40°C to 125°C. It delivers stable power to microprocessor core supplies and post-regulation stages following switching converters.
For engineers reviewing the LM1086ILD-3.3 datasheet, LM1086ILD-3.3 pinout, LM1086ILD-3.3 application, or LM1086ILD-3.3 equivalent, key selection considerations include dropout voltage at 1.5 A, thermal resistance (RθJA = 35.9°C/W), ceramic capacitor stability, and fixed 3.3-V output without external resistors.
Technical Context
The LM1086ILD-3.3 uses an NPN quasi-LDO pass transistor architecture-distinct from PNP LDOs-enabling lower quiescent current and 1.5-V dropout at 1.5 A. Its internal zener-trimmed bandgap reference ensures 2% initial output accuracy over temperature.
It integrates thermal shutdown and current limiting, supports ceramic output capacitors via ESR-compatible compensation, and maintains regulation with input-to-output differentials up to 27 V. The WSON-8 package features an exposed thermal pad for enhanced heat dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300 V ±2% (3.235–3.365 V) at 0–1.5 A, enabling direct replacement of 3.3-V logic rails without feedback resistors. |
| Dropout Voltage | 1.5 V max at 1.5 A load, allowing operation with only 4.8 V input for regulated 3.3 V output-critical for battery-powered systems. |
| Load Regulation | ≤25 mV (0.76%) from 0 to 1.5 A, ensuring minimal output shift under dynamic CPU load changes. |
| Line Regulation | ≤1.0 mV (0.03%) over 4.75–18 V input range, maintaining tight voltage control despite upstream supply ripple or sag. |
| Ripple Rejection | 72 dB typical at 120 Hz, suppressing switching noise from DC/DC pre-regulators before sensitive analog or RF circuitry. |
| Junction Temp Range | −40°C to 125°C, supporting industrial and automotive under-hood applications without derating. |
| Thermal Resistance | RθJA = 35.9°C/W (WSON-8), requiring ≤10.5 W max power dissipation at 70°C ambient for safe continuous operation. |
Pinout & Package
LM1086ILD-3.3 is housed in an 8-pin WSON (4 mm × 4 mm) package with wettable flanks and an exposed thermal pad (Pin 8). The package is RoHS-compliant and designed for automated optical inspection (AOI) and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | ADJ/GND | Ground terminal for fixed-output version; connects internally to die substrate-must be tied to system ground plane for stability and thermal path. |
| 2 | VOUT | Main regulated 3.3-V output; electrically connected to exposed thermal pad (Pin 8) for low-impedance power and thermal return. |
| 3 | VIN | Unregulated input (up to 27 V); requires local 10-µF ceramic decoupling within 5 mm to suppress high-frequency noise. |
| 4–5 | N/C | No internal connection; may be left floating or tied to ground for mechanical reinforcement-no electrical function. |
| 6–7 | VOUT | Secondary output terminals-bond-wire paralleled with Pin 2 to reduce trace inductance and improve transient response. |
| 8 (PAD) | VOUT / Thermal Pad | Exposed copper pad soldered to PCB thermal plane; mandatory for achieving rated 1.5-A output and RθJA = 35.9°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Ceramic capacitor stability | Stable with ≥10 µF X5R/X7R ceramic output capacitor (ESR < 100 mΩ), eliminating need for bulk tantalum or aluminum electrolytics. |
| Integrated protection | Current limiting (1.5–2.7 A) and thermal shutdown prevent damage during overload, short-circuit, or inadequate heatsinking. |
| Low quiescent current | 5–10 mA typical across input range, minimizing standby power loss in always-on embedded systems. |
| High PSRR at low frequency | 72 dB rejection at 120 Hz enables clean 3.3-V rail from noisy switcher outputs without additional LC filtering. |
| Wide input range | Operates with 4.75–27 V input differential, supporting 12-V or 24-V industrial bus inputs with single-stage regulation. |
Applications
| Microprocessor Core Supply | Battery Charger Post-Regulator |
|---|---|
|
Use Scenario: Powers ARM Cortex-M7 or RISC-V SoC cores requiring tightly regulated 3.3 V with fast load transients. IC Role / Device Role / Timing Role: Primary linear regulator delivering low-noise, low-ripple 3.3-V VDD_IO rail; handles di/dt spikes up to 1 A/µs. Use Value: 25-mV load regulation and 72-dB ripple rejection eliminate need for secondary LDOs, reducing BOM count and board area. |
Use Scenario: Final-stage regulation in Li-ion battery charger circuits, converting switched 5-V USB-PD or adapter output to precise 3.3-V charging logic voltage. IC Role / Device Role / Timing Role: Fixed-output post-regulator isolating sensitive charge management ICs from switching noise and input ripple. Use Value: 1.5-V dropout allows full 3.3-V delivery even as input drops to 4.8 V during USB-C cable voltage drop, extending usable charge window. |
| Industrial Sensor Signal Chain | Automotive Infotainment Power |
|
Use Scenario: Supplies ADCs, op-amps, and digital isolators in factory-floor pressure/temperature sensor nodes operating at −40°C to 125°C. IC Role / Device Role / Timing Role: Local point-of-load regulator providing ultra-low-noise 3.3-V bias for precision analog front-ends. Use Value: 0.003% RMS output noise and −40°C to 125°C guaranteed operation ensure measurement integrity across full industrial temperature range. |
Use Scenario: Powers display interface logic (LVDS, MIPI) and audio codecs in vehicle head units where EMI and thermal constraints limit switching regulators. IC Role / Device Role / Timing Role: Low-EMI linear regulator replacing noisy buck converters near RF-sensitive receivers and antennas. Use Value: Ceramic-capacitor compatibility and 35.9°C/W thermal resistance enable compact, fanless designs meeting automotive AEC-Q200 thermal cycling requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLD1133-33 | 3.3-V fixed, 300-mA output, 300-mV dropout, SOT-23-5 package | Lower current capacity; suited for I/O buffers or MCU peripherals-not core logic rails | Select when footprint and cost outweigh current demand; not suitable for >500-mA loads. |
| TPS7A4701RGWR | Adjustable, 1-A, 25-µVRMS noise, WQFN-20 package, 350-mV dropout | Ultra-low noise and adjustable output-but higher cost, larger size, and no fixed 3.3-V variant | Choose only if sub-50-µV noise or programmability justifies added complexity and cost. |
Compared with TLD1133-33 and TPS7A4701RGWR, LM1086ILD-3.3 uniquely balances 1.5-A capability, 1.5-V dropout, ceramic stability, and fixed 3.3-V output in a thermally optimized 4-mm WSON-making it optimal for space-constrained, medium-current industrial and automotive linear regulation.
Availability
LM1086ILD-3.3 is available at Aetrix Electronics and suitable for microprocessor core supplies, battery charger post-regulation, and industrial sensor signal chains requiring stable component supply with full lifecycle support.
Supply support for LM1086ILD-3.3 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and communications markets.
The LM1086 product line delivers robust, high-current LDO regulators targeting applications needing reliability under thermal stress and wide input ranges-especially where simplicity, ceramic capacitor compatibility, and proven field performance are critical.
FAQ
What is the maximum input voltage for LM1086ILD-3.3?
The LM1086ILD-3.3 supports a maximum input-to-output voltage differential of 27 V. With a fixed 3.3-V output, this means the absolute maximum input voltage is 30.3 V. However, recommended operating conditions specify 4.75 V to 18 V input for optimal thermal and regulation performance-exceeding 18 V increases power dissipation and requires careful thermal design.
Can LM1086ILD-3.3 use ceramic output capacitors?
Yes, LM1086ILD-3.3 is explicitly designed to be stable with ceramic output capacitors having ESR < 100 mΩ. A minimum 10-µF X5R or X7R ceramic capacitor is recommended. This eliminates reliance on higher-ESR tantalum or aluminum electrolytics, improving reliability, lifetime, and transient response in space-constrained designs.
What is the thermal pad connection requirement for LM1086ILD-3.3?
The exposed thermal pad (Pin 8) of LM1086ILD-3.3 must be soldered to a dedicated PCB copper pour connected to system ground. This pad carries the full output current and serves as the primary thermal conduction path. Omitting or undersizing the thermal pad results in excessive junction temperature rise and potential thermal shutdown or reduced lifetime.
Does LM1086ILD-3.3 require an input capacitor?
An input capacitor is not strictly required for stability but is strongly recommended: a 10-µF ceramic capacitor placed within 5 mm of the VIN pin suppresses high-frequency noise and prevents oscillation during fast load transients. TI's datasheet states "typically no input capacitor is needed unless the device is situated more than 6 inches from the input filter capacitors"-but board-level layout best practice mandates local decoupling.
How does LM1086ILD-3.3 handle short-circuit conditions?
LM1086ILD-3.3 incorporates foldback current limiting and thermal shutdown. Under short-circuit, output current reduces as input-to-output differential increases-limiting power dissipation. If junction temperature exceeds ~150°C, thermal shutdown disables the pass transistor until cooldown. Recovery is automatic upon fault removal and temperature reduction, with no latch-up or manual reset required.
LM1086ILD-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 27V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 5 mA
- Current - Supply (Max):
- 10 mA
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (4x4)
LM1086ILD-3.3 FAQ
1.How can I place an order for LM1086ILD-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM1086ILD-3.3 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 LM1086ILD-3.3 reliable?
The price and inventory of LM1086ILD-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM1086ILD-3.3 is usually 5 days.
3.What payment methods are accepted for LM1086ILD-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM1086ILD-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM1086ILD-3.3?
LM1086ILD-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM1086ILD-3.3 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 LM1086ILD-3.3?
For technical support, including LM1086ILD-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM1086ILD-3.3 requirements.
6.How does Aetrix verify that LM1086ILD-3.3 is sourced from the original manufacturer or authorized distributors?
All LM1086ILD-3.3 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 LM1086ILD-3.3 meets industry standards.
7.What is the process for return or replacement of LM1086ILD-3.3?
All LM1086ILD-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM1086ILD-3.3, 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 LM1086ILD-3.3 part is unused and in its original packaging.
Return procedure for LM1086ILD-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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