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STMicroelectronics LD1086BV
- Part No.:
- LD1086BV
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD1086BV.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:3,044
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Product details
Overview
LD1086BV from STMicroelectronics is a 1.5 A adjustable low-dropout linear voltage regulator with ±1% output voltage tolerance at 25 °C, 1.3 V typical dropout at full load, and internal thermal/overcurrent protection. It operates from −40 °C to +125 °C and requires only a 10 µF output capacitor for stability. It serves as a precision post-regulator in industrial power supplies and embedded system rails.
For engineers reviewing the LD1086BV datasheet, LD1086BV pinout, LD1086BV application, or LD1086BV equivalent, key selection considerations include dropout performance at 1.5 A, adjust-pin current stability (40–120 µA), reference voltage accuracy (1.25 V ±1%), thermal regulation (0.01–0.04 %/W), and compatibility with TO-220/D²PAK/DFN8 packages.
Technical Context
The LD1086BV implements an adjustable LDO architecture using an internal 1.25 V bandgap reference and error amplifier driving a PNP pass transistor. Its adjust pin senses feedback via external resistor divider, enabling programmable output from 1.25 V to 27 V. Quiescent current flows into the load-not wasted-improving efficiency over legacy PNP regulators.
It features integrated thermal shutdown and current limiting, with dropout voltage guaranteed ≤1.5 V at 1.5 A across temperature. Stability is ensured with ≥10 µF ceramic or tantalum output capacitance; no ESR requirements are imposed. The device supports fixed-output variants (e.g., LD1086V50) but LD1086BV is exclusively adjustable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1.5 A continuous; internally limited short-circuit current up to 2.3 A ensures robust fault handling. |
| Dropout Voltage | 1.3 V typical at 1.5 A; enables regulation from 3.4 V input for 1.8 V output, critical for low-voltage systems. |
| Reference Voltage | 1.25 V ±1% at 25 °C; sets output via R1/R2 divider: VO = 1.25 × (1 + R2/R1), enabling precise programmability. |
| Output Tolerance | ±1% at 25 °C, ±2% over −40 °C to +125 °C; meets tight rail requirements for microcontrollers and analog sensors. |
| Quiescent Current | 5–10 mA at VI ≤ 30 V; flows into load, not ground-reducing total system power loss vs. traditional regulators. |
| Adjust Pin Current | 40–120 µA at IO = 10 mA; low and stable, minimizing divider resistor power loss and output error. |
| Supply Rejection | 60–88 dB at 120 Hz; suppresses ripple from upstream switching converters, preserving clean analog/RF supply rails. |
Pinout & Package
LD1086BV is available in TO-220, D²PAK, DPAK, D²PAK/A, and DFN8 (4×4 mm) packages. The TAB is electrically connected to OUTPUT in all variants. Pinout is standardized across packages: Pin 1 = OUTPUT, Pin 2 = GND (or ADJ in adjustable versions), Pin 3 = INPUT. For DFN8, Pin 2 is ADJ, Pins 4–5 are exposed thermal pad (OUTPUT-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (TO-220/D²PAK/DPAK) / Pin 1 (DFN8) | OUTPUT | Main regulated output node; connects to TAB for low-impedance thermal path and current delivery. |
| Pin 2 (TO-220/D²PAK/DPAK) / Pin 2 (DFN8) | ADJ | Feedback input referenced to internal 1.25 V; sets output voltage via external resistor divider. |
| Pin 3 (TO-220/D²PAK/DPAK) / Pin 3 (DFN8) | INPUT | Unregulated DC input; must exceed VO + Vd; supports up to 30 V absolute max rating. |
| Thermal Pad (DFN8 Pins 4–5) | OUTPUT | Electrically tied to OUTPUT; soldered to PCB copper pour for enhanced thermal dissipation (RthJA = 33 °C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Performance | 1.3 V typ. at 1.5 A enables high-efficiency regulation from low-input sources like Li-ion or buck pre-regulators. |
| High Output Accuracy | ±1% VO tolerance at 25 °C reduces need for post-regulation trimming in precision analog or ADC reference circuits. |
| Load-Referenced Quiescent Current | IQ flows into load-not ground-cutting no-load power loss by ~30% vs. conventional PNP LDOs at same current. |
| Minimal External Components | Stable with single 10 µF output capacitor; no ESR or bypass capacitor required on ADJ pin for basic operation. |
| Robust Protection Suite | Integrated thermal shutdown and current limiting prevent damage during overload, short-circuit, or ambient overheating. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Regulating 3.3 V rail for isolated digital I/O drivers and CAN transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary post-regulator converting 5 V buck output to stable 3.3 V; handles load transients up to 1.5 A during solenoid activation. Use Value: 1.3 V dropout allows operation with minimal headroom; ±1% tolerance ensures reliable logic-level margin for 3.3 V microcontrollers. |
Use Scenario: Powering MCU core, LIN transceiver, and sensor interface in door module ECUs operating from 9–16 V battery. IC Role / Device Role / Timing Role: Adjustable LDO generating 2.85 V for MCU core supply; rejects battery ripple and load dump noise. Use Value: 88 dB PSRR at 120 Hz suppresses alternator ripple; wide −40 °C to +125 °C range meets AEC-Q100 Grade 2 requirements. |
| Medical Patient Monitor Analog Front-End | Networking Switch PHY Supply |
|
Use Scenario: Providing ultra-low-noise 2.5 V bias for 24-bit delta-sigma ADCs and instrumentation amplifiers. IC Role / Device Role / Timing Role: Low-noise local regulator for signal-chain components; decouples analog section from noisy digital power domains. Use Value: 0.003% RMS output noise and <0.04 %/W thermal regulation preserve ENOB in high-resolution data acquisition. |
Use Scenario: Generating 1.8 V supply for Gigabit Ethernet PHY ICs requiring fast transient response and tight voltage windows. IC Role / Device Role / Timing Role: Secondary LDO delivering clean 1.8 V from 3.3 V intermediate rail; responds to 10 µs load steps per IEEE 802.3. Use Value: 10 µF stability support simplifies layout; 1.5 A rating covers peak PHY transmit currents without droop. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LDR2G | 200 mA max output, 2 V min dropout, ±2% VO tolerance, higher IQ (5–10 mA independent of load). | Suitable only for sub-200 mA loads; less accurate and less efficient under heavy load due to higher dropout and ground-referenced IQ. | Select when cost sensitivity outweighs performance; avoid where >1 A or <1.5 V dropout is required. |
| TLV1117LV33 | Fixed 3.3 V output only, 1 A max, 0.6 V dropout, ±2% tolerance, 50 µA IQ (load-independent). | Lacks adjustability; cannot generate voltages other than 3.3 V; lower dropout but insufficient current for 1.5 A applications. | Choose only for fixed 3.3 V use cases with strict low-dropout needs and <1 A load; not a functional substitute for LD1086BV. |
Compared with LM317LDR2G and TLV1117LV33, LD1086BV delivers 1.5× higher current, 0.7 V lower dropout, tighter ±1% tolerance, and load-referenced quiescent current-making it uniquely suited for high-current, high-accuracy adjustable LDO roles where thermal headroom and regulation stability are critical.
Availability
LD1086BV is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical analog front-ends, and networking PHY supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LD1086BV 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power management ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
LD1086BV belongs to ST's high-current LDO voltage regulator family, engineered specifically for demanding industrial and automotive applications requiring precision, ruggedness, and wide-temperature reliability.
FAQ
What is the minimum output capacitor required for LD1086BV stability?
The LD1086BV is stable with a minimum 10 µF ceramic or tantalum output capacitor. No ESR range is specified, simplifying capacitor selection. Larger values improve transient response and reduce output ripple, but 10 µF is sufficient for all operating conditions per ST's characterization across −40 °C to +125 °C.
Can LD1086BV be used in parallel for higher current?
No-LD1086BV is not designed for parallel operation. Its adjust-pin architecture and lack of current-sharing control make paralleling unsafe and unstable. For >1.5 A, select a higher-current regulator (e.g., LD1085) or redesign the power stage with a switching controller.
Is LD1086BV pin-compatible with older LM317 designs?
Yes-LD1086BV maintains identical pinout (INPUT–ADJ–OUTPUT) and footprint compatibility with LM317 in TO-220 and DPAK packages. However, its lower dropout, tighter tolerance, and load-referenced IQ deliver measurable performance gains without board rework.
Does LD1086BV require an input capacitor?
An input capacitor is recommended but not strictly required for stability. A 1 µF ceramic capacitor placed near the INPUT pin improves line transient response and reduces high-frequency noise coupling. ST's typical application circuits include it, especially when input source impedance is high or trace inductance is significant.
LD1086BV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 28.5V
- Voltage Dropout (Max):
- 1.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 88dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LD1086BV FAQ
1.How can I place an order for LD1086BV through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086BV 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 LD1086BV reliable?
The price and inventory of LD1086BV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086BV is usually 5 days.
3.What payment methods are accepted for LD1086BV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086BV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086BV?
LD1086BV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086BV 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 LD1086BV?
For technical support, including LD1086BV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086BV requirements.
6.How does Aetrix verify that LD1086BV is sourced from the original manufacturer or authorized distributors?
All LD1086BV 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 LD1086BV meets industry standards.
7.What is the process for return or replacement of LD1086BV?
All LD1086BV units undergo pre-shipment inspection (PSI). If there is an issue with LD1086BV, 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 LD1086BV part is unused and in its original packaging.
Return procedure for LD1086BV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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