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Analog Devices Inc. LT1074HVIT7#PBF
- Part No.:
- LT1074HVIT7#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LT1074HVIT7#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:702
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Product details
Overview
LT1074HVIT7#PBF from Analog Devices (formerly Linear Technology) is a 5A monolithic bipolar step-down switching regulator with integrated 5A Darlington NPN 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 LT1074HVIT7#PBF datasheet, LT1074HVIT7#PBF pinout, LT1074HVIT7#PBF application, or LT1074HVIT7#PBF equivalent, key selection considerations include its HV-rated 64V max input, 45V switch-to-ground swing capability, 7-pin TO-220 package with SHDN/ILIM pins, and compatibility with tapped-inductor designs delivering up to 10A at 5V.
Technical Context
The LT1074HVIT7#PBF implements a classic buck topology enhanced with an analog multiplier in the feedback loop, enabling near-instantaneous line transient response and input-voltage-independent loop gain. Its Darlington NPN switch supports 40V negative swing below ground, enabling tapped-inductor and inverting configurations.
It integrates pulse-by-pulse current limiting, frequency downshifting below 1.3V FB voltage (to ~20kHz), micropower shutdown (<300µA), and programmable current limit via the ILIM pin - all controlled within a single die without external sense resistors or timing capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 60V - supports wide industrial input rails including 24V, 36V, 48V systems with margin. |
| Output Voltage Range | 2.5V to 50V - set externally via resistor divider; enables flexible regulation across multiple subsystems. |
| Switch Current Rating | 5A continuous - onboard Darlington NPN switch eliminates external MOSFET and driver complexity. |
| Switching Frequency | 100kHz (±10%) - fixed internal oscillator simplifies EMI filtering and inductor selection. |
| Quiescent Current | 8.5mA - enables low-noise operation in always-on industrial monitoring circuits. |
| Current Limit Range | 0A to 6.5A - adjustable via ILIM pin resistor; supports soft-start and foldback protection. |
| Shutdown Current | ≤300µA - micropower shutdown mode extends battery life in backup power applications. |
Pinout & Package
LT1074HVIT7#PBF is housed in a 7-lead plastic TO-220 (T7) package with tab connected to GND. The package provides thermal resistance θJA = 35°C/W and θJC = 2.5°C/W, suitable for convection-cooled industrial PCBs.
| 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 to suppress switching transients. |
| VSW | Switch collector output | Swings to 45V below GND - enables tapped-inductor buck and inverting topologies without level-shifting. |
| GND | Power and signal reference | Internal reference tied to this pin; must connect directly to low-current output return path to avoid load regulation error. |
| VC | Error amplifier output | Drives external RC compensation network; asymmetrical ±140µA/1.1mA sourcing/sinking prevents startup overshoot. |
| FB/SENSE | Inverting input of error amplifier | Compares output divider voltage to 2.21V internal reference; also triggers frequency downshift below 1.3V. |
| ILIM | Current limit programming | Internally biased at 4.5V when open; external resistor to GND sets precise current limit (e.g., 7kΩ → ~3A). |
| SHDN | Shutdown control | 2.45V threshold enables undervoltage lockout; <0.3V forces full micropower shutdown (140–300µA total supply current). |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage dependency in loop gain - improves line regulation and reduces output deviation during input transients. |
| Tapped-inductor support | 45V VSW-to-GND rating enables 10A output at 5V using center-tapped inductors - doubles current capability without paralleling switches. |
| Programmable current limit | Adjustable from zero to 6.5A via single ILIM resistor - allows precise overcurrent protection without external sensing components. |
| Frequency downshifting | Reduces switching frequency from 100kHz to ~20kHz as FB drops below 1.3V - maintains stable current limiting under short-circuit conditions. |
| Micropower shutdown | Reduces total supply current to ≤300µA - enables energy-efficient standby modes in battery-backed systems. |
Applications
| Industrial 24V-to-12V Power Supply | High-Current Tapped-Inductor Converter |
|---|---|
Use Scenario: Converting 24V rail to regulated 12V for PLC I/O modules and sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck regulator controlling duty cycle via FB pin; VC pin drives RC compensation for stability across temperature. Use Value: 5A integrated switch eliminates external FET and gate driver, reducing BOM count and layout area while maintaining >85% efficiency at full load. | Use Scenario: Generating 5V/10A from 24V input for FPGA core power in test equipment requiring high current density. IC Role / Device Role / Timing Role: Tapped-inductor buck controller leveraging VSW's 45V negative swing to drive center-tapped winding and double output current. Use Value: Achieves 10A output with single IC and one inductor - avoids parallel-phase design complexity and current-sharing mismatches. |
| Positive-to-Negative Inverter | Wide-Input Telecom Power Module |
Use Scenario: Generating –5V at 1A from 12V–36V input for analog front-end biasing in data acquisition systems. IC Role / Device Role / Timing Role: Inverting converter topology using VSW as switch node referenced to floating output; FB senses negative rail via isolated divider. Use Value: Eliminates need for isolated DC-DC or charge pump - reduces cost and EMI vs transformer-based solutions while supporting variable input range. | Use Scenario: Providing 3.3V/3A from 36V–60V telecom rectified bus in remote radio head power management. IC Role / Device Role / Timing Role: High-input-voltage buck regulator operating at 60V max VIN; SHDN pin enables remote enable/disable via base station controller. Use Value: HV rating avoids input pre-regulation stage; programmable current limit protects against cable fault conditions without additional circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#PBF | 40V max input, 3A integrated switch, 3MHz sync capability, no tapped-inductor support | Higher frequency enables smaller magnetics but lacks 45V VSW swing for inverting/tapped use cases | Select when compact size and low output ripple are critical; avoid when negative output or >5A tapped-inductor needed |
| LM5088MHX/NOPB | 60V max input, 5A external MOSFET drive, no integrated switch, requires gate driver and sense resistor | Greater flexibility in switch selection but increases component count, layout complexity, and thermal design effort | Select when higher efficiency (>90%) at light loads or custom FET optimization is required; avoid for rapid prototyping or space-constrained designs |
Compared with LTC3632EMSE#PBF and LM5088MHX/NOPB, LT1074HVIT7#PBF uniquely combines 60V input rating, 5A integrated switch, 45V VSW swing, and tapped-inductor capability - making it optimal for ruggedized industrial converters where simplicity, reliability, and topology versatility outweigh ultra-high efficiency or miniaturization goals.
Availability
LT1074HVIT7#PBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom rectifier modules, and test equipment requiring stable component supply with long-term manufacturability and extended temperature operation.
Supply support for LT1074HVIT7#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 legacy Linear parts including the LT1074 family.
The LT1074HVIT7#PBF belongs to Linear's high-voltage monolithic switching regulator product line, engineered for robustness in harsh environments - emphasizing wide input range, integrated protection, and multi-topology flexibility over ultra-low quiescent current or digital configurability.
FAQ
What is the maximum input voltage rating for LT1074HVIT7#PBF?
The LT1074HVIT7#PBF has an absolute maximum input voltage rating of 64V, with recommended operating range from 8V to 60V. This HV designation differentiates it from the standard LT1074 (45V max input) and enables direct use with 48V telecom or industrial bus systems without pre-regulation.
Can LT1074HVIT7#PBF be used in a positive-to-negative converter configuration?
Yes, LT1074HVIT7#PBF supports positive-to-negative conversion due to its VSW pin's ability to swing 45V below ground. When configured as an inverting buck-boost, it regulates negative output voltages such as –5V or –12V from a positive input - confirmed in Linear Application Note 44 and Figure TA03 of the datasheet.
What is the purpose of the ILIM pin on LT1074HVIT7#PBF?
The ILIM pin on LT1074HVIT7#PBF sets the peak switch current limit. With no external resistor, it defaults to 6.5A. Connecting a resistor from ILIM to GND lowers the limit linearly (e.g., 7kΩ → ~3A). This enables programmable overcurrent protection, soft-start, and foldback limiting - all without external sense resistors or comparators.
Does LT1074HVIT7#PBF require an external clock or synchronization signal?
No, LT1074HVIT7#PBF uses an internal 100kHz oscillator and does not support external clock synchronization. Its frequency is fixed and unadjustable; however, it features automatic frequency downshifting (to ~20kHz) when FB voltage falls below 1.3V - a built-in feature for short-circuit protection, not a sync interface.
What thermal performance can be expected from LT1074HVIT7#PBF in a standard TO-220 layout?
In a standard 0.5 in² copper pad layout per Linear's datasheet Note 1, LT1074HVIT7#PBF achieves θJA = 35°C/W and θJC = 2.5°C/W. At 5A load and 25°C ambient, junction temperature rise is approximately 122°C - confirming necessity of heatsinking or derating above 3A in enclosed environments.
LT1074HVIT7#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-7 Formed Leads
- 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-220-7
LT1074HVIT7#PBF FAQ
1.How can I place an order for LT1074HVIT7#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074HVIT7#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 LT1074HVIT7#PBF reliable?
The price and inventory of LT1074HVIT7#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074HVIT7#PBF is usually 5 days.
3.What payment methods are accepted for LT1074HVIT7#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074HVIT7#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1074HVIT7#PBF?
LT1074HVIT7#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074HVIT7#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 LT1074HVIT7#PBF?
For technical support, including LT1074HVIT7#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074HVIT7#PBF requirements.
6.How does Aetrix verify that LT1074HVIT7#PBF is sourced from the original manufacturer or authorized distributors?
All LT1074HVIT7#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 LT1074HVIT7#PBF meets industry standards.
7.What is the process for return or replacement of LT1074HVIT7#PBF?
All LT1074HVIT7#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074HVIT7#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 LT1074HVIT7#PBF part is unused and in its original packaging.
Return procedure for LT1074HVIT7#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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