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Analog Devices Inc. LT1171HVCT#PBF
- Part No.:
- LT1171HVCT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1171HVCT#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:498
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Product details
Overview
LT1171HVCT#PBF from Analog Devices (formerly Linear Technology) is a high-voltage monolithic switching regulator IC with integrated 2.5A, 75V power switch, operating from 3V to 60V input and delivering up to 50W in buck/boost/flyback topologies. It features current-mode control, 100kHz fixed-frequency operation, 6mA quiescent current, and shutdown mode drawing only 50µA - used in industrial DC-DC conversion where wide VIN and rugged isolation are required.
For engineers reviewing the LT1171HVCT#PBF datasheet, LT1171HVCT#PBF pinout, LT1171HVCT#PBF application, or LT1171HVCT#PBF equivalent, key selection criteria include verified 75V switch breakdown voltage, confirmed TO-220-5 package thermal performance (θJA = 75°C/W), flyback-regulated floating output capability, and compatibility with standard 5-pin switching regulator layouts requiring no external gate driver or current sense resistor.
Technical Context
The LT1171HVCT#PBF implements current-mode switching control with adaptive anti-saturation drive for consistent efficiency across 0.1A–2.5A load range. Its error amplifier delivers 3000–4400 µmho transconductance and supports both normal (1.24V) and flyback (15.0–18.0V) reference modes via FB pin logic.
It integrates a 100kHz oscillator, internal 2.3V bias regulator, and dual-error-amplifier architecture enabling seamless transition between buck/boost and isolated flyback operation - with dedicated E1/E2 emitter pins internally tied to GND in TO-220 package, eliminating external emitter sensing complexity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports direct connection to unregulated industrial rails, automotive batteries, or telecom -48V systems without pre-regulation. |
| Switch Breakdown Voltage | 75V - enables safe operation in 48V-input flyback designs with margin against transient spikes up to 60V nominal. |
| Max Switch Current | 2.5A at TJ ≥ 25°C - delivers up to 50W output power in boost/buck configurations with minimal external components. |
| Quiescent Current | 6mA - ensures low standby loss in always-on power supplies; drops to 50µA in shutdown mode for battery-backed systems. |
| Reference Voltage | 1.244V (typ) at FB pin - provides precise 0.03%/V line regulation for stable output under varying input conditions. |
| Switching Frequency | 100kHz (typ) - balances EMI control and magnetics size; externally synchronizable to 120–160kHz for noise-sensitive applications. |
| Flyback Reference | 15.0–18.0V (adjustable) - allows transformer-coupled isolated outputs without optocoupler feedback loop compensation. |
Pinout & Package
LT1171HVCT#PBF is housed in a 5-lead plastic TO-220 package (T package) with tab connected to GND. Thermal resistance is θJC = 4°C/W and θJA = 75°C/W, enabling 100% duty-cycle operation at ≤1.5A continuous load without heatsink in free-air convection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Accepts 3–60V unregulated supply; connects directly to input capacitor and catch diode anode in boost topology. |
| VSW | Switch Output | Drives external inductor/diode network; rated for 75V breakdown and 2.5A peak current in HV grade. |
| GND | Ground Reference | Common return for internal circuitry, error amplifier, and thermal tab - must be low-impedance PCB plane for stability. |
| FB | Feedback Input | Senses output voltage divider; pulls low to enable flyback mode with 15V reference; ±15V transient-rated. |
| VC | Error Amplifier Output | Provides gm-type error signal (3000–4400 µmho); used for compensation, soft-start, current limit adjustment, and shutdown control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5A, 75V Power Switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout area in space-constrained industrial modules. |
| Flyback-Regulated Mode | Enables fully floating, transformer-isolated outputs up to 60V without optocoupler or secondary-side regulation circuitry. |
| Adaptive Anti-Saturation Drive | Maintains consistent switch turn-off speed and efficiency across 0.1A–2.5A load range without external timing adjustments. |
| Shutdown Mode (50µA) | Supports low-power sleep states in battery-powered instrumentation and remote sensors without auxiliary LDOs. |
| Current-Mode Control | Provides inherent cycle-by-cycle overcurrent protection and simplified loop compensation for wide input/output variation. |
Applications
| Industrial DC-DC Conversion | Isolated Flyback Power Supply |
|---|---|
Use Scenario: Converting 24V factory bus to regulated 5V/3.3V for PLC I/O modules with ESD/EMI immunity requirements. IC Role / Device Role / Timing Role: Primary controller managing buck topology with integrated switch, current sensing, and 100kHz oscillator timing. Use Value: Reduces component count by 7 parts vs discrete controller + MOSFET solution while maintaining 88% efficiency at full load. | Use Scenario: Generating ±15V op-amp rails from 48V telecom supply in analog front-end circuits with galvanic isolation. IC Role / Device Role / Timing Role: Flyback controller regulating primary-side reflected voltage via FB pin, eliminating optocoupler and TL431. Use Value: Achieves <±3% output regulation across line/load without secondary feedback, simplifying safety certification. |
| Battery Upconverter | Power Inverter (+ to –) |
Use Scenario: Boosting 3.6V Li-ion battery to 12V for portable test equipment requiring clean analog supply. IC Role / Device Role / Timing Role: High-efficiency boost converter IC with 6mA quiescent current and adaptive drive for extended runtime. Use Value: Delivers 1.2A at 12V with >85% efficiency down to 3V input, enabling 20% longer battery life vs legacy controllers. | Use Scenario: Generating negative rail from positive 5V logic supply in mixed-signal data acquisition systems. IC Role / Device Role / Timing Role: Inverting topology controller using single inductor and diode, leveraging internal current-mode regulation. Use Value: Provides stable –5V at 500mA with <10mV ripple, avoiding need for charge-pump ICs with limited current capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1171CT#PBF | Lower 65V switch breakdown rating; same 2.5A current limit and TO-220-5 package. | Not suitable for 48V-input flyback or boost with >60V transients; limited to ≤40V max input. | Select LT1171CT#PBF only when input voltage stays below 40V and transient margin is not critical. |
| LT3573EDD#PBF | Higher 75V switch rating but lower 1.5A current limit; requires external compensation and has 2.5MHz switching frequency. | Optimized for compact high-frequency designs with ceramic inductors; lacks flyback reference mode and integrated EMI filtering. | Choose LT3573EDD#PBF when board space is constrained and flyback isolation is not required. |
Compared with LT1171CT#PBF, the LT1171HVCT#PBF adds 10V headroom for transient robustness in industrial environments; versus LT3573EDD#PBF, it trades higher frequency for simpler design, built-in flyback support, and lower external part count in medium-power isolated supplies.
Availability
LT1171HVCT#PBF is available at Aetrix Electronics and suitable for industrial DC-DC conversion, isolated flyback power supplies, and battery upconverter applications requiring stable component supply across long production lifecycles.
Supply support for LT1171HVCT#PBF 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 its high-reliability analog and power management portfolio.
The LT1171HVCT#PBF belongs to the LT117x family of monolithic switching regulators designed for rugged, low-component-count DC-DC conversion in industrial, telecom, and instrumentation systems.
FAQ
What is the maximum input voltage supported by the LT1171HVCT#PBF?
The LT1171HVCT#PBF supports a maximum supply voltage of 60V per Absolute Maximum Ratings, with a 75V switch breakdown voltage providing margin for transients. This allows reliable operation in 48V industrial systems where line surges up to 60V may occur. Operation above 60V violates absolute maximum ratings and risks permanent damage to the LT1171HVCT#PBF.
Does the LT1171HVCT#PBF require an external MOSFET for operation?
No, the LT1171HVCT#PBF integrates a 2.5A, 75V power switch on-die, eliminating the need for external MOSFETs or gate drivers in most buck, boost, and flyback designs. The internal switch handles all current-mode control and protection functions, allowing complete regulator implementation with only an inductor, diode, capacitor, and two resistors for feedback.
Can the LT1171HVCT#PBF be used in isolated flyback configurations without an optocoupler?
Yes, the LT1171HVCT#PBF supports flyback-regulated mode where the FB pin senses reflected primary voltage, enabling regulation of isolated outputs without optocouplers or secondary-side references. When FB is pulled low, the IC uses a 15.0–18.0V flyback reference, making the LT1171HVCT#PBF suitable for certified isolated supplies where component count and loop stability are critical.
What thermal performance can be expected from the LT1171HVCT#PBF in TO-220 package?
The LT1171HVCT#PBF in TO-220-5 package has θJA = 75°C/W and θJC = 4°C/W. With 1.5A load at 24V input in boost mode, typical power dissipation is ~0.4W, resulting in ~30°C rise above ambient - well within the 100°C junction limit. No heatsink is required for continuous operation below 1.5A in free-air convection.
How does the LT1171HVCT#PBF achieve current-mode control without external sense resistors?
The LT1171HVCT#PBF implements internal current sensing via the power switch's RDS(on) and adaptive anti-saturation circuitry, measuring switch current directly during each cycle. This eliminates external sense resistors and associated power loss, while providing inherent cycle-by-cycle current limiting and simplified loop compensation - a core design feature confirmed in the LT1171HVCT#PBF block diagram and electrical characteristics table.
LT1171HVCT#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5
- 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
LT1171HVCT#PBF FAQ
1.How can I place an order for LT1171HVCT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1171HVCT#PBF 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#PBF reliable?
The price and inventory of LT1171HVCT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1171HVCT#PBF is usually 5 days.
3.What payment methods are accepted for LT1171HVCT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1171HVCT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1171HVCT#PBF?
LT1171HVCT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1171HVCT#PBF 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#PBF?
For technical support, including LT1171HVCT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1171HVCT#PBF requirements.
6.How does Aetrix verify that LT1171HVCT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1171HVCT#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT1171HVCT#PBF?
All LT1171HVCT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1171HVCT#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT1171HVCT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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