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Analog Devices Inc. LT1171HVCT#30PBF
- Part No.:
- LT1171HVCT#30PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LT1171HVCT#30PBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:378
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Product details
Overview
LT1171HVCT#30PBF from Analog Devices (formerly Linear Technology) is a monolithic high-efficiency 100kHz current-mode switching regulator IC with an integrated 2.5A, 75V power switch. It operates from 3V to 60V input, delivers up to 50W in buck/boost/flyback topologies, draws only 6mA quiescent current, and supports external shutdown (50µA standby). It is used in industrial DC-DC conversion where wide VIN, high reliability, and topology flexibility are required.
For engineers reviewing the LT1171HVCT#30PBF datasheet, LT1171HVCT#30PBF pinout, LT1171HVCT#30PBF application, or LT1171HVCT#30PBF equivalent, key selection criteria include its 75V switch breakdown rating, 2.5A internal switch current limit, TO-220-5 package thermal performance (θJA = 75°C/W), flyback-regulated floating output capability, and adaptive anti-saturation drive for stable operation across load transients.
Technical Context
The LT1171HVCT#30PBF implements current-mode control with a fixed 100kHz oscillator, enabling fast line/load transient response and simplified loop compensation. Its dual error amplifier architecture supports both standard regulation (via FB pin at 1.24V reference) and isolated flyback mode (via FB pin pull-down to 15V reference).
It integrates adaptive anti-saturation switch drive, internal 2.3V bias regulator, and logic-level shutdown via VC pin (<0.15V). The TO-220-5 package ties E1/E2 internally to GND, eliminating emitter sensing but optimizing thermal path for continuous 2.5A operation at ≤100°C ambient with minimal heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Breakdown Voltage | 75V - Enables safe operation with 60V max input and robust surge margin in industrial power rails. |
| Internal Switch Current Limit | 2.5A (typ.) - Supports ≥50W output in buck/boost configurations without external MOSFETs. |
| Quiescent Supply Current | 6mA - Minimizes no-load power loss in battery-backed or always-on systems. |
| Shutdown Supply Current | 50µA - Enables ultra-low-power standby in energy-sensitive applications. |
| Reference Voltage (FB) | 1.24V ±2% - Provides precise output voltage setting with standard resistor-divider feedback. |
| Flyback Reference Voltage | 15.0V ±1.3V - Enables transformer-isolated output regulation without optocoupler feedback. |
| Switching Frequency | 100kHz (±12kHz) - Balances efficiency, magnetics size, and EMI in medium-power SMPS designs. |
| Operating Junction Temp | 0°C to 100°C - Specifies validated performance envelope for commercial/industrial environments. |
Pinout & Package
The LT1171HVCT#30PBF is housed in a 5-lead plastic TO-220 package (T package) with the metal tab electrically connected to GND. Thermal resistance is θJC = 4°C/W and θJA = 75°C/W, supporting high-power operation with minimal heatsink area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary DC input supply (3V–60V); connects to bulk capacitor and input filter. |
| VSW | Switch Output | Drives external inductor/diode network; carries full switched current and high dv/dt. |
| GND | Ground Reference | Power and signal ground; tied internally to metal tab for low-inductance thermal path. |
| FB | Feedback Input | Senses output voltage divider; selects normal (1.24V) or flyback (15V) regulation mode. |
| VC | Error Amplifier Output / Control | Provides compensation node, soft-start, current limit adjustment, and shutdown control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5A, 75V Power Switch | Eliminates external high-voltage MOSFET and driver, reducing BOM count and layout complexity in 30–50W converters. |
| Current-Mode Control Architecture | Delivers inherent cycle-by-cycle current limiting and superior line regulation vs. voltage-mode controllers. |
| Flyback-Regulated Mode | Enables fully floating, transformer-isolated outputs without optocouplers or secondary-side sensing circuitry. |
| Adaptive Anti-Saturation Drive | Maintains optimal switch turn-off speed across 0–2.5A load range, minimizing switching losses and thermal stress. |
| External Shutdown (50µA) | Allows system-level power sequencing and low-power sleep modes without auxiliary regulators. |
| Wide Input Range (3V–60V) | Supports direct connection to 12V/24V/48V industrial buses, automotive batteries, and renewable energy sources. |
Applications
| Industrial DC-DC Conversion | Battery-Powered Upconversion |
|---|---|
Use Scenario: Converting unregulated 24V factory bus to stable 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary switching controller implementing synchronous buck topology with integrated power switch and current sensing. Use Value: Eliminates need for external high-side MOSFET and gate driver, reducing board space by >30% and improving MTBF over discrete solutions. | Use Scenario: Boosting 3.7V Li-ion battery output to 12V for portable instrumentation or handheld test equipment. IC Role / Device Role / Timing Role: High-efficiency boost converter controller with adaptive anti-saturation drive ensuring stable operation down to 3V input. Use Value: Delivers >88% peak efficiency at 1A load while maintaining regulation during battery discharge from 4.2V to 3.0V. |
| Floating Isolated Power Supplies | High-Voltage Bias Generation |
Use Scenario: Generating ±15V op-amp supplies from a single 24V rail in medical analog front-ends requiring galvanic isolation. IC Role / Device Role / Timing Role: Flyback-mode controller using transformer-coupled secondary windings and FB pin programming for isolated regulation. Use Value: Achieves <±1.5% output accuracy across load and line without optocoupler or TL431, simplifying certification for IEC 60601-1. | Use Scenario: Providing –24V bias for LCD contrast control or RF amplifier stages in telecom infrastructure equipment. IC Role / Device Role / Timing Role: Inverting topology controller with integrated switch, supporting negative output generation from positive input. Use Value: Enables compact, low-noise negative rail generation without external P-channel switch or charge pump ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3703-5 | External MOSFET driver; no integrated switch; 5V–100V input; 100kHz sync capability. | Requires external high-side N-MOSFET and bootstrap circuit; suited for >100W or higher efficiency needs. | Select when higher power, programmable frequency, or lower conduction loss is prioritized over integration. |
| LM2596HV | 3A switch; 60V max input; 150kHz fixed frequency; no flyback mode or VC-based shutdown. | Lacks flyback regulation, adaptive anti-sat, and precise 50µA shutdown - limited to non-isolated topologies. | Select for cost-sensitive, non-isolated buck applications where flyback capability and ultra-low standby are not required. |
Compared with LTC3703-5 and LM2596HV, the LT1171HVCT#30PBF uniquely combines 75V switch rating, flyback-mode isolation support, and sub-100µA shutdown in a single TO-220 package - making it optimal for space-constrained, isolated, or wide-input industrial power supplies where integration and topology flexibility outweigh raw efficiency targets.
Availability
LT1171HVCT#30PBF is available at Aetrix Electronics and suitable for industrial DC-DC conversion, battery-powered upconversion, and floating isolated power supplies requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT1171HVCT#30PBF 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
Analog Devices acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear power products.
The LT1171HVCT#30PBF belongs to the LT117x family of monolithic high-power switching regulators, designed specifically for rugged, wide-input industrial and automotive power conversion where integration, reliability, and topology versatility are critical.
FAQ
What is the maximum input voltage supported by the LT1171HVCT#30PBF?
The LT1171HVCT#30PBF supports a maximum supply voltage of 60V under normal operation, with an absolute maximum switch breakdown voltage of 75V. This HV grade variant is rated for continuous operation up to 60V input, exceeding the 40V limit of standard LT1171 variants - making it suitable for 48V industrial buses and automotive cold-crank scenarios.
Does the LT1171HVCT#30PBF support flyback topology with isolated outputs?
Yes, the LT1171HVCT#30PBF supports flyback-regulated mode. When the FB pin is pulled below 0.54V with an external resistor, it activates the internal flyback error amplifier with a 15.0V reference, enabling transformer-isolated output regulation without optocouplers or secondary-side feedback components.
What is the thermal resistance and heatsink requirement for the LT1171HVCT#30PBF in continuous 2.5A operation?
The LT1171HVCT#30PBF in TO-220-5 package has θJA = 75°C/W and θJC = 4°C/W. At 2.5A switch current and 24V input in buck mode, typical power dissipation is ~1.8W. With no heatsink, ambient must be ≤75°C to maintain TJ ≤100°C; adding a 10°C/W heatsink allows full-load operation up to 85°C ambient.
How does the LT1171HVCT#30PBF achieve current limiting and overload protection?
The LT1171HVCT#30PBF uses peak-current-mode control with a fixed 2.5A (typ.) internal current limit. Each switching cycle terminates when sensed switch current reaches the limit threshold. Combined with adaptive anti-saturation drive and thermal foldback, this provides robust pulse-by-pulse protection against short circuits and overloads without external sensing resistors.
Can the LT1171HVCT#30PBF be synchronized to an external clock?
No, the LT1171HVCT#30PBF does not support external synchronization. Unlike later-generation controllers, its 100kHz oscillator is fixed-frequency and not synchronizable. For designs requiring clock alignment (e.g., multi-rail systems), alternatives like LTC3703-5 or LT3757 should be considered.
LT1171HVCT#30PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.244V
- Voltage - Output (Max):
- 75V (Switch)
- Current - Output:
- 2.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5 Flow 30
LT1171HVCT#30PBF FAQ
1.How can I place an order for LT1171HVCT#30PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1171HVCT#30PBF 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 LT1171HVCT#30PBF reliable?
The price and inventory of LT1171HVCT#30PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1171HVCT#30PBF is usually 5 days.
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LT1171HVCT#30PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1171HVCT#30PBF 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 LT1171HVCT#30PBF?
For technical support, including LT1171HVCT#30PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1171HVCT#30PBF requirements.
6.How does Aetrix verify that LT1171HVCT#30PBF is sourced from the original manufacturer or authorized distributors?
All LT1171HVCT#30PBF 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 LT1171HVCT#30PBF meets industry standards.
7.What is the process for return or replacement of LT1171HVCT#30PBF?
All LT1171HVCT#30PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1171HVCT#30PBF, 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 LT1171HVCT#30PBF part is unused and in its original packaging.
Return procedure for LT1171HVCT#30PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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