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Analog Devices Inc. LT1074HVCT#PBF
- Part No.:
- LT1074HVCT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1074HVCT#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,386
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Product details
Overview
LT1074HVCT#PBF from Analog Devices (formerly Linear Technology) is a 5A monolithic bipolar step-down switching regulator with integrated 60V-rated power switch, analog multiplier feedback loop, and 100kHz fixed-frequency operation. It supports buck, positive-to-negative, and tapped-inductor topologies, delivering up to 10A output at 5V in tapped-inductor mode. Designed for industrial power supplies requiring high input voltage tolerance and robust overload protection.
For engineers reviewing the LT1074HVCT#PBF datasheet, LT1074HVCT#PBF pinout, LT1074HVCT#PBF application, or LT1074HVCT#PBF equivalent, key selection criteria include its 64V absolute maximum input voltage rating, 45V switch-to-ground swing capability, programmable current limit via ILIM pin, micropower shutdown mode (140–300µA), and compatibility with standard 5-lead TO-220 thermal layout practices.
Technical Context
The LT1074HVCT#PBF implements a classic buck topology enhanced by an on-chip true analog multiplier in the feedback path, making loop gain independent of input voltage and enabling near-instantaneous line transient response. Its Darlington NPN switch is driven by patented fast-saturation PNP circuitry, allowing the VSW terminal to swing 40V below ground - critical for tapped-inductor and inverting configurations.
Current limiting operates pulse-by-pulse with ≈600ns detection/turn-off latency, and frequency shifting (100kHz → 20kHz) activates when FB falls below 1.3V to maintain control under extreme duty-cycle conditions. Shutdown is implemented by pulling the ILIM pin low, with dual thresholds: 2.2–2.7V for duty-cycle halt and ≤0.6V for full micropower state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 60V (buck); self-boot enables ≥5V operation in inverting/boost modes - supports wide industrial input rails. |
| Switch Voltage Rating | 75V max between VSW and GND - enables 45V negative swing for inverting converters and high-side tap handling. |
| Output Current | 5A continuous (on-chip switch); up to 10A in tapped-inductor buck configuration - eliminates need for external high-current switches in many designs. |
| Switching Frequency | Fixed 100kHz ±10% (85–120kHz over temp) - balances EMI, efficiency, and passive size; shifts to 20kHz under short-circuit for stable current control. |
| Quiescent Current | 8.5–11mA active; 140–300µA in shutdown - enables low-power standby without auxiliary LDOs. |
| Reference Voltage | 2.21V ±1.5% over temp and line/load - sets output accuracy; trimmed internal reference avoids external DAC dependency. |
| Current Limit Range | 6.5A default (ILIM open); adjustable down to zero via external resistor - supports precise overcurrent protection tuning for diverse loads. |
Pinout & Package
LT1074HVCT#PBF uses the 5-lead plastic TO-220 (T package) with tab connected to GND. The package provides θJA = 35°C/W (mounted on 0.5 in² 1 oz copper), suitable for convection-cooled industrial applications up to 5A continuous load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and high-current switch source | Supplies internal circuitry and carries full switch current; must be bypassed with low-ESR capacitor placed adjacent to pin. |
| VSW | Switch collector output | Swings up to 45V below GND; connects to inductor/diode node; requires careful layout to minimize ringing and EMI. |
| GND | Power and signal reference | Internal reference and error amplifier ground; must connect directly to low-current output return point to avoid load regulation error. |
| VC | Error amplifier output / compensation node | Drives external RC network for loop stability; asymmetrical ±140µA/1.1mA sink-source capability reduces startup overshoot. |
| FB/SENSE | Inverting input of error amplifier | Compares output divider voltage against 2.21V reference; also triggers frequency shift when <1.3V during overload. |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation, improving line transient response by >3× vs conventional PWM controllers. |
| Tapped-inductor support | 45V negative VSW swing enables 10A/5V output without external MOSFETs - reduces BOM count and PCB area in high-current DC/DC designs. |
| Programmable current limit | External resistor from ILIM to GND sets trip point from 0A to 6.5A - allows precise matching to transformer saturation or cable derating limits. |
| Micropower shutdown | 140–300µA supply current in shutdown - enables battery-backed systems to retain regulation readiness without significant drain. |
| Frequency shifting under fault | Automatic 100kHz → 20kHz reduction when FB <1.3V - maintains accurate current limiting even at 0.2µs theoretical minimum on-time. |
Applications
| Industrial 24V/48V Power Supply | High-Current Tapped-Inductor Buck |
|---|---|
Use Scenario: Converting 36V nominal industrial bus to regulated 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck controller managing input transients, load steps, and brownout recovery with built-in current limiting and thermal foldback. Use Value: 60V input rating handles 48V surge standards (IEC 61000-4-5); 5A switch eliminates external FET, reducing component count and failure points. | Use Scenario: Generating 5V/10A for FPGA core rails or motor driver logic in factory automation equipment. IC Role / Device Role / Timing Role: Tapped-inductor buck controller leveraging VSW's 45V negative swing to achieve high current without synchronous rectification. Use Value: Delivers 10A at 5V using only LT1074HVCT#PBF, one inductor, and one Schottky diode - cuts solution cost vs dual-MOSFET controllers. |
| Positive-to-Negative Converter | Wide-Input Telecom Power Module |
Use Scenario: Generating –5V/1A bias rail for op-amp signal conditioning stages in data acquisition systems. IC Role / Device Role / Timing Role: Inverting buck-boost controller operating in positive-to-negative topology with fixed 100kHz switching. Use Value: Self-boot capability enables start-up from 4.5V input; 2.21V reference ensures tight output regulation across temperature and line variation. | Use Scenario: Providing isolated 12V/2A auxiliary supply from 36–72V telecom rectified bus in base station power shelves. IC Role / Device Role / Timing Role: High-input-voltage buck controller with undervoltage lockout programmed via SHDN pin divider. Use Value: 64V absolute max input withstands 72V transients; programmable UVLO (e.g., 40V turn-on / 35V hold) prevents erratic restart during brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3775EFE#PBF | External MOSFET controller (no onboard switch); supports 4–38V input; 95% efficiency at 12V→5V/10A. | Requires external high-side/lower FETs and gate drivers; better suited for >15A or >90% efficiency targets. | Select LTC3775EFE#PBF when higher efficiency, lower heat dissipation, or multi-phase scaling is required - not a drop-in replacement. |
| LM5088MHX/NOPB | 5A integrated buck; 4.5–75V input; no analog multiplier; fixed 100kHz; 1.22V reference. | Lacks tapped-inductor support and VSW negative swing; simpler loop compensation but poorer line transient response. | Choose LM5088MHX/NOPB for cost-sensitive 5A buck designs where 60V+ input and inverting topologies are not needed. |
Compared with LTC3775EFE#PBF and LM5088MHX/NOPB, the LT1074HVCT#PBF uniquely combines onboard 5A switching, 64V input tolerance, 45V negative VSW swing, and analog multiplier-based line regulation - making it irreplaceable for compact, high-reliability tapped-inductor or inverting converters in industrial environments.
Availability
LT1074HVCT#PBF is available at Aetrix Electronics and suitable for industrial power supplies, factory automation systems, and telecom auxiliary modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1074HVCT#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 full product support, datasheet archives, and application engineering resources for legacy Linear parts including the LT1074HV series.
The LT1074HV product line was designed for rugged industrial and telecom DC/DC conversion where high input voltage, integrated switching, and fault-tolerant operation are mandatory - emphasizing reliability over feature count.
FAQ
What is the maximum input voltage rating for the LT1074HVCT#PBF?
The LT1074HVCT#PBF has an absolute maximum input voltage rating of 64V, with recommended operating range of 8V to 60V in buck configuration. Its HV suffix denotes enhanced voltage tolerance versus the standard LT1074 (45V max). This rating is validated per Linear Technology's Absolute Maximum Ratings table and applies across the full industrial temperature range (–40°C to 85°C).
Can the LT1074HVCT#PBF be used in a positive-to-negative converter topology?
Yes, the LT1074HVCT#PBF supports positive-to-negative conversion due to its VSW pin's ability to swing 45V below ground. This capability is explicitly documented in the "Applications" section of the datasheet and demonstrated in Figure TA03. The device uses self-boot operation to start from inputs as low as 4.5V in this configuration, making it suitable for generating –5V/1A rails in data acquisition systems.
How is current limit set on the LT1074HVCT#PBF?
Current limit on the LT1074HVCT#PBF is set via the ILIM pin: left open, it defaults to 6.5A; connecting an external resistor (RLIM) from ILIM to GND lowers the limit per RLIM = ILIM × 2kΩ + 1kΩ. For example, a 7kΩ resistor sets ~3A limit. This relationship is confirmed in the Electrical Characteristics table (Note 6) and Application Note 44, and applies across temperature with ±25% accuracy for 2–5A settings.
Does the LT1074HVCT#PBF require an external compensation network?
Yes, the LT1074HVCT#PBF requires an external RC network from VC to GND for loop stability. The error amplifier's transconductance (5000µmho) and output impedance interact with this network to set gain and phase margin. Typical values are RC = 10kΩ and CC = 100nF, as shown in the Basic Positive Buck Converter schematic (TA01). Omitting compensation causes instability and oscillation under load transients.
What thermal performance can be expected from the LT1074HVCT#PBF in a standard TO-220 footprint?
When mounted on 0.5 in² of 1 oz copper over an internal ground plane, the LT1074HVCT#PBF achieves θJA = 35°C/W and θJC = 2.5°C/W. At 5A output with 24V input and 5V output, junction temperature rise is ≈87.5°C above ambient - confirming suitability for convection-cooled industrial enclosures rated to 70°C ambient. This data is specified in the "Package Information" section and verified in thermal characterization plots (TPC11–TPC13).
LT1074HVCT#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, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 64V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 35V
- Current - Output:
- 5.5A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LT1074HVCT#PBF FAQ
1.How can I place an order for LT1074HVCT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074HVCT#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 LT1074HVCT#PBF reliable?
The price and inventory of LT1074HVCT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074HVCT#PBF is usually 5 days.
3.What payment methods are accepted for LT1074HVCT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074HVCT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1074HVCT#PBF?
LT1074HVCT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074HVCT#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 LT1074HVCT#PBF?
For technical support, including LT1074HVCT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074HVCT#PBF requirements.
6.How does Aetrix verify that LT1074HVCT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1074HVCT#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 LT1074HVCT#PBF meets industry standards.
7.What is the process for return or replacement of LT1074HVCT#PBF?
All LT1074HVCT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074HVCT#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 LT1074HVCT#PBF part is unused and in its original packaging.
Return procedure for LT1074HVCT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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