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Analog Devices Inc. LT1074HVIT#PBF
- Part No.:
- LT1074HVIT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1074HVIT#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LT1074HVIT#PBF from Analog Devices (formerly Linear Technology) is a 5A monolithic bipolar step-down switching regulator with integrated 60V-rated power switch, designed for high-input-voltage buck, positive-to-negative, and tapped-inductor converter topologies. It operates from 8V to 60V input, delivers adjustable output from 2.5V to 50V, features 100kHz fixed-frequency operation, 8.5mA quiescent current, and programmable current limit up to 6.5A - used in industrial power supplies and high-voltage DC-DC conversion.
For engineers reviewing the LT1074HVIT#PBF datasheet, LT1074HVIT#PBF pinout, LT1074HVIT#PBF application, or LT1074HVIT#PBF equivalent, key selection criteria include its HV-rated 60V input capability, 5A onboard switch, true analog multiplier feedback for line transient immunity, ILIM-adjustable current limit, and TO-220-7 package with shutdown and current limit pins.
Technical Context
The LT1074HVIT#PBF implements a classic buck topology enhanced with a true analog multiplier in the feedback loop, making loop gain independent of input voltage and enabling near-instantaneous response to VIN transients. Its Darlington NPN switch supports 40V swing below ground, enabling tapped-inductor configurations delivering up to 10A at 5V.
It integrates pulse-by-pulse current limiting with ≈600ns fault detection, frequency downshifting (100kHz → 20kHz) when FB drops below 1.3V for short-circuit control, and micropower shutdown (<300µA) via dedicated SHDN pin. The ILIM pin allows external resistor programming of current limit from zero to 6.5A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 60V - supports wide industrial and telecom input rails without pre-regulation. |
| Output Current | 5A continuous - enables compact high-current buck designs without external MOSFETs. |
| Switching Frequency | 100kHz (±10%) - balances efficiency, EMI, and inductor size; downshifts to 20kHz under overload. |
| Current Limit Range | 0 to 6.5A - set via ILIM pin resistor; open-circuit default is 6.5A for LT1074HV. |
| Quiescent Current | 8.5mA - enables low-noise, high-efficiency operation at light loads. |
| Reference Voltage | 2.21V ±1.5% - precision trimmed internal reference for stable output regulation. |
| Shutdown Current | ≤300µA - ensures ultra-low power state during system standby. |
Pinout & Package
LT1074HVIT#PBF is housed in a 7-lead plastic TO-220 package (T7) with tab connected to GND. The package provides thermal performance of θJA = 35°C/W and θJC = 2.5°C/W, suitable for convection-cooled industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and high-side switch source | Carries full input current; must be bypassed with low-ESR capacitor close to pin. |
| VSW | Switch collector output | Swings to 40V below GND; drives external inductor/diode in buck or inverting topologies. |
| GND | Power and signal reference | Internal reference and error amplifier ground; must connect directly to low-current output return path. |
| VC | Error amplifier output | Drives external RC compensation network; controls duty cycle via PWM comparator. |
| FB/SENSE | Inverting input of error amplifier | Compares divided output against 2.21V reference; also triggers frequency downshift below 1.3V. |
| ILIM | Current limit programming | Accepts external resistor to GND to scale current limit from zero to 6.5A. |
| SHDN | Shutdown control | Active-low: ≥2.45V enables operation; ≤0.3V forces full micropower shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates line-regulation dependency on input voltage, improving transient response and simplifying loop compensation. |
| Programmable current limit | External resistor on ILIM pin sets precise overcurrent threshold from zero to 6.5A, enabling custom short-circuit protection. |
| Frequency downshifting | Automatically reduces switching frequency from 100kHz to 20kHz as FB falls below 1.3V, maintaining control during output shorts. |
| Micropower shutdown | Reduces total supply current to ≤300µA while preserving fast wake-up and no latch-up behavior. |
| 40V negative swing capability | Enables tapped-inductor buck and positive-to-negative converter topologies delivering up to 10A at 5V. |
Applications
| Industrial DC-DC Power Supply | Telecom Line Card Converter |
|---|---|
Use Scenario: Converting 24–48V telecom battery backup rail to regulated 5V/3.3V for FPGA, DSP, and interface ICs in NEBS-compliant equipment. IC Role / Device Role / Timing Role: Primary buck controller with integrated 60V switch and programmable current limit, managing dynamic load steps and brownout conditions. Use Value: Eliminates need for external high-voltage MOSFET and gate driver; 60V input rating avoids pre-regulator stage; ILIM pin enables precise current limiting for hot-swap compliance. | Use Scenario: Generating isolated –5V at 1A from +24V input in legacy telecom line cards requiring negative bias for analog circuitry. IC Role / Device Role / Timing Role: Positive-to-negative inverting regulator using standard buck layout with polarity-reversed output capacitor and diode. Use Value: Leverages 40V VSW swing below GND to achieve clean negative output without transformer; fixed 100kHz frequency simplifies EMI filtering. |
| Tapped-Inductor High-Current Buck | High-Voltage Industrial Sensor Supply |
Use Scenario: Delivering 5V/10A from 20–35V input in motor drive control modules where space-constrained PCBs require minimal external components. IC Role / Device Role / Timing Role: Tapped-inductor buck controller with internal 5A switch driving center-tapped inductor; VSW pin connects to tap point. Use Value: Achieves 10A output using single LT1074HVIT#PBF and one inductor - eliminates dual-phase complexity and reduces BOM count by >30%. | Use Scenario: Providing stable 12V/1A supply from unregulated 36–60V industrial bus for PLC I/O modules and field transmitters. IC Role / Device Role / Timing Role: Adjustable-output buck regulator operating across full 60V input range with tight line regulation due to analog multiplier feedback. Use Value: Maintains ±1% output accuracy over 36–60V input variation; 8.5mA quiescent current minimizes standby losses in always-on sensor nodes. |
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 internal switch); supports up to 60V input; requires dual external FETs. | Used where higher efficiency (>95%), lower heat, or synchronous rectification is required - not suitable for space-constrained single-chip designs. | Select LTC3775EFE#PBF only when thermal budget or efficiency demands exceed LT1074HVIT#PBF's 5A integrated switch capability. |
| LM5088MHX/NOPB | 65V input, 5A peak current limit, current-mode control; no analog multiplier; fixed 100kHz or adjustable 50–1000kHz. | Preferred for designs needing adjustable frequency or better light-load efficiency; lacks VSW swing below GND and tapped-inductor support. | Choose LM5088MHX/NOPB for new designs prioritizing flexibility and modern current-mode stability, but verify absence of negative-swing requirement. |
Compared with LTC3775EFE#PBF and LM5088MHX/NOPB, LT1074HVIT#PBF uniquely combines integrated 5A switch, 40V negative VSW swing, analog multiplier feedback, and ILIM-programmable current limit in a single TO-220-7 package - making it optimal for cost-sensitive, space-constrained, high-input-voltage buck and inverting converters where simplicity and proven reliability are critical.
Availability
LT1074HVIT#PBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom line card converters, high-current tapped-inductor buck regulators, and high-voltage sensor supplies requiring stable component supply and long-term manufacturability.
Supply support for LT1074HVIT#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, documentation, and manufacturing continuity for the LT1074HV family.
The LT1074HV series was designed for rugged, high-input-voltage DC-DC conversion in industrial, telecom, and instrumentation systems - emphasizing integration, fault tolerance, and ease of use without sacrificing performance.
FAQ
What is the maximum input voltage rating for LT1074HVIT#PBF?
The LT1074HVIT#PBF has an absolute maximum input voltage rating of 64V, with recommended continuous operation up to 60V. This HV rating distinguishes it from the standard LT1074 (45V max), enabling direct connection to 48V telecom or 60V industrial buses without pre-regulation. Always observe derating guidelines per ambient temperature and PCB copper area.
Does LT1074HVIT#PBF support negative output voltage generation?
Yes, LT1074HVIT#PBF supports positive-to-negative converter topologies. Its VSW pin is specified to swing 40V below ground, allowing it to drive center-tapped inductors or configure as an inverting buck-boost. Application Note AN44 provides validated schematics for –5V/1A operation from +24V input using LT1074HVIT#PBF in standard TO-220-7 layout.
How is current limit programmed on LT1074HVIT#PBF?
Current limit on LT1074HVIT#PBF is programmed via the ILIM pin: connecting an external resistor RLIM from ILIM to GND sets ILIM ≈ (320µA × RLIM). For example, a 7kΩ resistor yields ~2.24A limit. With ILIM open, LT1074HVIT#PBF defaults to 6.5A. The formula RLIM = ILIM(2kΩ) + 1kΩ applies for LT1074HV variants.
What thermal performance can be expected from LT1074HVIT#PBF in TO-220-7 package?
LT1074HVIT#PBF in the T7 (TO-220-7) package has θJA = 35°C/W and θJC = 2.5°C/W when mounted on 0.5 in² of 1 oz. copper over internal ground plane. At 5A load and 25°C ambient, junction temperature rise is ~175°C above ambient - requiring heatsinking or airflow for sustained operation. Derate linearly above 125°C junction temperature.
Can LT1074HVIT#PBF operate with input voltage below 8V?
No - LT1074HVIT#PBF requires minimum 8V on VIN for normal buck regulation. However, in inverting or boost configurations, the self-boot feature enables startup down to 5V input. This is explicitly documented in the Absolute Maximum Ratings table and Electrical Characteristics section for LT1074HV variants.
LT1074HVIT#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:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LT1074HVIT#PBF FAQ
1.How can I place an order for LT1074HVIT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074HVIT#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 LT1074HVIT#PBF reliable?
The price and inventory of LT1074HVIT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074HVIT#PBF is usually 5 days.
3.What payment methods are accepted for LT1074HVIT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074HVIT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1074HVIT#PBF?
LT1074HVIT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074HVIT#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 LT1074HVIT#PBF?
For technical support, including LT1074HVIT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074HVIT#PBF requirements.
6.How does Aetrix verify that LT1074HVIT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1074HVIT#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 LT1074HVIT#PBF meets industry standards.
7.What is the process for return or replacement of LT1074HVIT#PBF?
All LT1074HVIT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074HVIT#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 LT1074HVIT#PBF part is unused and in its original packaging.
Return procedure for LT1074HVIT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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