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STMicroelectronics LD1086BV-DG
- Part No.:
- LD1086BV-DG
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LD1086BV-DG.pdf
- Description:
- IC REG LINEAR POS ADJ 1.5A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:842
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Product details
Overview
LD1086BV-DG from STMicroelectronics is a 1.5 A adjustable low-dropout linear voltage regulator with 1.25 V internal reference, ±1% output voltage tolerance at 25 °C, 1.3 V typical dropout at full load, and operation from −40 °C to +125 °C. It delivers stable 1.8 V, 3.3 V, or 5 V fixed outputs or programmable output via external resistor divider in industrial power rails and embedded system supply domains.
For engineers reviewing the LD1086BV-DG datasheet, LD1086BV-DG pinout, LD1086BV-DG application, or LD1086BV-DG equivalent, key selection criteria include dropout voltage under 1.5 A load, adjust pin current stability across input range, thermal regulation performance, and compatibility with minimal 10 µF output capacitance for stability.
Technical Context
The LD1086BV-DG implements an NPN-based LDO architecture with on-chip trimmed 1.25 V bandgap reference and integrated thermal/overcurrent protection. Its adjust pin draws only 40–120 µA, enabling high-efficiency operation since quiescent current flows into the load rather than being wasted as bias current.
It supports both fixed-output (via internal resistor network) and adjustable configurations using two external resistors. Dropout voltage remains ≤1.5 V up to 1.5 A output current, with line and load regulation specified down to ±0.4 mV and ±10 mV respectively over full temperature and load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Guaranteed 1.5 A continuous; enables single-regulator powering of FPGA I/O banks or microcontroller core/logic rails. |
| Dropout Voltage | 1.3 V typical at 1.5 A; allows operation with only 1.3 V headroom-e.g., 5 V input → 3.7 V output possible. |
| Reference Voltage | 1.25 V ±1.5% (1.231–1.269 V); sets precision for adjustable output configurations using R1/R2 divider. |
| Output Tolerance | ±1% at 25 °C, ±2% over −40 °C to +125 °C; ensures reliable logic-level compliance for 3.3 V or 5 V digital systems. |
| Quiescent Current | 5–10 mA max; flows into load-not ground-improving efficiency vs. PNP-based regulators. |
| Stability Capacitor | 10 µF minimum ceramic or tantalum; eliminates need for complex compensation networks in compact PCB layouts. |
| Thermal Protection | Internally enabled; shuts down above safe junction temperature and auto-recovers when cooled-no external circuitry required. |
Pinout & Package
LD1086BV-DG is supplied in DFN8 (4x4) package with exposed thermal pad. The TAB is electrically connected to the OUTPUT pin for optimal thermal conduction to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 2.85–30 V DC; must be ≥ (VOUT + Vd) to maintain regulation. |
| 2 (OUT) | Regulated output | Delivers precise output; connects directly to load and serves as thermal path via exposed pad. |
| 3 (ADJ/GND) | Adjust/reference return | In adjustable mode: sets output via R1/R2 divider; in fixed mode: internally tied to GND reference node. |
| 4–8 (NC) | No connect | Not bonded; left floating or tied to GND for mechanical stability-no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-to-pin compatible | Replaces legacy 3-terminal adjustable regulators (e.g., LM317) without layout change. |
| Tight output tolerance | ±1% at 25 °C achieved via on-chip laser trimming-reduces need for post-production calibration. |
| Low dropout | 1.3 V typ. @ 1.5 A enables use in battery-powered systems where input voltage sags near output level. |
| Load-connected quiescent current | Iq flows into load instead of ground, improving efficiency by ~0.5–1% at light loads versus PNP regulators. |
| Wide temp range | −40 °C to +125 °C operation certified per industrial grade spec-suitable for under-hood or factory-floor environments. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Providing clean 3.3 V rail for ARM Cortex-M7 MCU and CAN transceiver in DIN-rail mounted controller. IC Role / Device Role / Timing Role: Primary LDO supplying core logic and interface peripherals; maintains regulation during 12 V battery dips to 9 V. Use Value: 1.3 V dropout ensures uninterrupted operation down to 4.6 V input-critical during cold-crank events. | Use Scenario: Generating 5 V for dashboard display backlight driver and sensor signal conditioning circuitry. IC Role / Device Role / Timing Role: Fixed-output 5 V regulator with automotive-grade thermal robustness and short-circuit recovery. Use Value: ±2% output tolerance over −40 °C to +125 °C guarantees display brightness consistency and ADC reference stability. |
| Network Edge Router Board | Medical Patient Monitor |
Use Scenario: Delivering 1.8 V to FPGA configuration memory and 3.3 V to Ethernet PHY on compact SBC. IC Role / Device Role / Timing Role: Dual-rail LDO supporting low-noise analog and high-speed digital domains from shared 5 V intermediate bus. Use Value: 0.003% RMS output noise and 82 dB PSRR suppress switching noise from upstream DC-DC converter. | Use Scenario: Powering isolated ECG front-end amplifier and low-power microcontroller in portable diagnostic device. IC Role / Device Role / Timing Role: Safety-critical LDO with thermal shutdown and internal current limiting to prevent fault propagation. Use Value: Internal protection eliminates need for external fuse or current-sense IC-reducing BOM count and failure modes. |
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 | Higher 1.9 V dropout at 100 mA; ±2% output tolerance; no thermal foldback-only shutdown. | Lacks automotive temp rating and tight tolerance needed for precision analog rails. | Prefer for cost-sensitive, non-automotive designs where dropout margin >2 V is available. |
| TLV1117-33CDCYR | Lower 1.2 V dropout but limited to 800 mA; fixed 3.3 V only; no adjustable option. | Suitable only for fixed-voltage, sub-1 A loads-cannot replace LD1086BV-DG in programmable or 1.5 A applications. | Select when board space is constrained and output voltage is fixed at 3.3 V with <1 A requirement. |
Compared with LM317LDR2G and TLV1117-33CDCYR, LD1086BV-DG uniquely combines 1.5 A capability, adjustable/fixed flexibility, ±1% tolerance, and automotive-grade thermal resilience-making it the only choice for high-current, precision, multi-voltage industrial power designs.
Availability
LD1086BV-DG is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, network infrastructure equipment, and medical diagnostics requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LD1086BV-DG 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, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The LD1086 series belongs to ST's high-reliability linear regulator product line, engineered specifically for demanding industrial and automotive power management where precision, thermal robustness, and long-term stability are critical.
FAQ
What is the minimum output capacitor required for stability with LD1086BV-DG?
A minimum 10 µF ceramic or tantalum capacitor is required at the output for guaranteed stability across all operating conditions. Lower values may cause oscillation, especially with high-ESR capacitors or under transient load steps. ST recommends X7R dielectric ceramics with ≤100 mΩ ESR for optimal phase margin.
Can LD1086BV-DG be used in adjustable mode with a 2.5 V output?
Yes-LD1086BV-DG supports adjustable output using the ADJ pin and external resistor divider. With VREF = 1.25 V, a 2.5 V output requires R1 = R2 (e.g., 2.4 kΩ each). Output accuracy depends on resistor tolerance and temperature drift; ±0.1% resistors yield ±0.2% added error beyond the IC's ±1% baseline.
Does LD1086BV-DG require a bypass capacitor on the ADJ pin?
No external ADJ pin capacitor is mandatory, but adding 1–10 µF between ADJ and GND improves ripple rejection and load transient response in sensitive analog applications. This capacitor does not affect DC accuracy but reduces AC error coupling from the reference node.
Is the DFN8 (4x4) package of LD1086BV-DG RoHS and REACH compliant?
Yes-LD1086BV-DG in DFN8 (4x4) meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. STMicroelectronics provides full material declarations and substance compliance documentation upon request through authorized distribution channels.
LD1086BV-DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- 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-DG FAQ
1.How can I place an order for LD1086BV-DG through Aetrix?
Please submit a Request for Quotation (RFQ) for LD1086BV-DG 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-DG reliable?
The price and inventory of LD1086BV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LD1086BV-DG is usually 5 days.
3.What payment methods are accepted for LD1086BV-DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LD1086BV-DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LD1086BV-DG?
LD1086BV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LD1086BV-DG 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-DG?
For technical support, including LD1086BV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LD1086BV-DG requirements.
6.How does Aetrix verify that LD1086BV-DG is sourced from the original manufacturer or authorized distributors?
All LD1086BV-DG 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-DG meets industry standards.
7.What is the process for return or replacement of LD1086BV-DG?
All LD1086BV-DG units undergo pre-shipment inspection (PSI). If there is an issue with LD1086BV-DG, 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-DG part is unused and in its original packaging.
Return procedure for LD1086BV-DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LD1086BV-DG Tags
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