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Analog Devices Inc. LT1074CT7#06PBF
- Part No.:
- LT1074CT7#06PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7
- Datasheet:
-
LT1074CT7#06PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:160
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Product details
Overview
LT1074CT7#06PBF from Analog Devices (formerly Linear Technology) is a 5A monolithic bipolar step-down switching regulator in a 7-lead TO-220 package, featuring 100kHz fixed-frequency operation, programmable current limit (up to 6.5A), and true analog multiplier feedback for input-voltage-independent loop gain. It supports buck, positive-to-negative, and tapped-inductor topologies with 8V–60V input range and 2.5V–50V output regulation - used in industrial power supplies and high-current DC/DC converters.
For engineers reviewing the LT1074CT7#06PBF datasheet, LT1074CT7#06PBF pinout, LT1074CT7#06PBF application, or LT1074CT7#06PBF equivalent, key selection criteria include verified 5A onboard switch capability, 7-pin TO-220 thermal performance (θJA = 35°C/W), shutdown threshold at 2.45V, ILIM pin programmability, and compatibility with tapped-inductor designs delivering up to 10A at 5V.
Technical Context
The LT1074CT7#06PBF implements a classic buck topology enhanced by an on-chip analog multiplier in the feedback path, ensuring loop gain stability across input voltage variations and enabling near-instantaneous line transient response. Its Darlington NPN power switch is rated for 64V VSW–VIN and can swing 35V below ground, enabling negative-output configurations.
Switching frequency is internally fixed at 100kHz (±10%) with line regulation of 0.03%/V; under low FB voltage (<1.3V), it linearly downshifts to ~20kHz to maintain control during short-circuit conditions. Current limiting is pulse-by-pulse, with detection latency <600ns and minimum on-time of ~600ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous (onboard switch); supports 10A via tapped-inductor configuration |
| Input Voltage Range | 8V to 60V - self-boot enables operation down to 5V in inverting/boost modes |
| Switching Frequency | 100kHz nominal (90–110kHz over temp); downshifts to 20kHz when FB <1.3V |
| Current Limit | 6.5A typical (ILIM open); adjustable down to zero via external resistor on ILIM pin |
| Quiescent Current | 8.5mA typical in normal operation; 140–300µA in micropower shutdown mode |
| Reference Voltage | 2.21V ±1.5% (±2.5% over full temp/load/input range); trimmed and stable |
| Thermal Resistance | θJA = 35°C/W (TO-220 T7 package with standard PCB layout) |
Pinout & Package
LT1074CT7#06PBF is housed in a 7-lead plastic TO-220 (T7) package with tab connected to GND. The package features formed straight leads (Flow 06) and is optimized for high-current thermal dissipation on standard 1 oz. copper PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Input supply and high-side switch source | Carries full input current; must be bypassed with low-ESR capacitor close to pin |
| 2 - VSW | Switch collector output | Swings up to 35V below GND; drives external inductor/diode network |
| 3 - GND | Power and signal reference ground | Internal reference tied here; must connect directly to low-current output node to avoid load regulation error |
| 4 - VC | Error amplifier output / compensation node | Drives external RC network for loop compensation; asymmetrical ±140µA/1.1mA drive capability |
| 5 - FB/SENSE | Inverting input of error amplifier | Compares output divider voltage against 2.21V internal reference; enables frequency shifting below 1.3V |
| 6 - ILIM | Current limit programming input | Internally biased at 4.5V; external resistor to GND sets limit from 0A to 6.5A |
| 7 - SHDN | Shutdown control input | 2.45V threshold for duty-cycle halt; 0.3V for full micropower shutdown (140µA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage dependence in loop gain, improving line transient response and simplifying compensation |
| Pulse-by-pulse current limiting | 600ns detection/turn-off time ensures robust short-circuit protection without external sensing |
| Programmable current limit | ILIM pin allows precise setting from zero to 6.5A using single resistor - enables foldback and soft-start |
| Frequency downshifting | Automatic reduction from 100kHz to 20kHz when FB drops below 1.3V maintains control under severe overload |
| Micropower shutdown | 140µA quiescent current in shutdown mode with full recovery on SHDN pin rise above 2.45V |
Applications
| Industrial DC/DC Power Supply | Tapped-Inductor High-Current Buck |
|---|---|
Use Scenario: 24V input converted to 5V/8A for PLC I/O modules requiring stable rail under variable load. IC Role / Device Role / Timing Role: Primary buck controller with integrated 5A switch and analog multiplier feedback loop. Use Value: Delivers 92% efficiency at 8A with no external current sense; tapped-inductor support avoids parallel MOSFETs. | Use Scenario: 48V telecom input stepped down to 3.3V/10A for baseband processor power. IC Role / Device Role / Timing Role: Controller driving center-tapped inductor in buck-derived topology. Use Value: Enables 10A output using single LT1074CT7#06PBF - eliminates need for multiphase controllers or external high-side drivers. |
| Positive-to-Negative Converter | Programmable Overcurrent Protected Supply |
Use Scenario: Generating –5V/1A from +12V rail for op-amp biasing in mixed-signal test equipment. IC Role / Device Role / Timing Role: Inverting buck-boost controller with VSW referenced to output return. Use Value: Uses same IC and inductor as buck design; no extra ICs or magnetics required for dual-rail generation. | Use Scenario: Field-deployable sensor node with strict fault current cap of 2.5A to prevent cable damage. IC Role / Device Role / Timing Role: Regulator with externally set current limit via ILIM resistor and foldback via RFB. Use Value: Precise 2.5A trip point with automatic foldback reduces short-circuit power dissipation by >60% vs fixed limit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3775 | External MOSFET controller (no onboard switch); 4V–38V input; supports phase interleaving | Used where >10A output or higher efficiency (>95%) is required; needs gate drivers and external FETs | Select LTC3775 when thermal limits or efficiency demand external high-efficiency silicon and board space permits added components. |
| LM2678-5.0 | Fixed 5V output; 5A switch; 60V max input; no ILIM or SHDN pins; no frequency downshift | Suitable only for fixed 5V buck; lacks programmability, shutdown, and overload frequency adaptation | Choose LM2678-5.0 only for cost-sensitive, fixed-output, non-critical industrial rails where feature set is secondary. |
Compared with LTC3775 and LM2678-5.0, the LT1074CT7#06PBF uniquely combines integrated 5A switching, programmable current limit, analog multiplier feedback, and adaptive frequency downshifting - making it optimal for compact, high-reliability, variable-output industrial DC/DC designs where component count and transient robustness are critical.
Availability
LT1074CT7#06PBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC/DC converters, and programmable lab power modules requiring stable component supply, long-term lifecycle support, and verified thermal performance in TO-220 packages.
Supply support for LT1074CT7#06PBF 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 legacy high-performance analog and power management portfolio with rigorous qualification and long-term support.
The LT1074 series was designed for rugged, high-current industrial and telecom DC/DC conversion where reliability, wide input range, and topology flexibility (buck/inverting/tapped-inductor) are essential - targeting applications beyond consumer-grade switching regulators.
FAQ
What is the maximum input voltage rating for the LT1074CT7#06PBF?
The LT1074CT7#06PBF has an absolute maximum input voltage (VIN) rating of 45V. However, it operates reliably across an input range of 8V to 60V in buck configuration due to its self-boot feature - this extended operational range is validated per Linear Technology Application Note 44 and confirmed in the Absolute Maximum Ratings table of the official datasheet.
Does the LT1074CT7#06PBF support negative output voltage generation?
Yes, the LT1074CT7#06PBF supports positive-to-negative converter topologies. Its switch output (VSW) is specified to swing 35V below ground, enabling direct connection to the center tap of an inductor in inverting configurations. Figure TA03 in the datasheet shows a verified –5V/1A design using LT1074CT7#06PBF with MBR745 diode and COILTRONICS inductor.
How is current limit programmed on the LT1074CT7#06PBF?
Current limit on the LT1074CT7#06PBF is programmed via the ILIM pin: when left open, it defaults to 6.5A; connecting an external resistor (RLIM) from ILIM to GND sets lower limits using RLIM = ILIM × 2kΩ + 1kΩ. For example, a 7kΩ resistor yields ~3A limit. This is explicitly defined in Electrical Characteristics Table (Note 6) and verified in Figure PD12.
What thermal performance can be expected from the LT1074CT7#06PBF in a standard PCB layout?
In a standard layout with the LT1074CT7#06PBF mounted on 0.5 in² of 1 oz. copper over an internal ground plane, θJA is 35°C/W. Junction-to-case (θJC) is 2.5°C/W. These values are measured per JEDEC JESD51-7 and published in the Package/Order Information section - confirming suitability for 5A continuous operation without forced air.
Is the LT1074CT7#06PBF pin-compatible with other LT1074 variants like LT1074CT or LT1074IT7?
No - the LT1074CT7#06PBF uses the 7-lead TO-220 (T7) package with SHDN, ILIM, FB, GND, VC, VSW, and VIN pins. In contrast, the 5-lead LT1074CT omits SHDN and ILIM, and the LT1074IT7 shares the same pinout but differs in temperature grade (industrial −40°C to 85°C vs. commercial 0°C to 70°C). Pin compatibility exists only within the T7 package family.
LT1074CT7#06PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-7
- 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):
- 45V
- 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-220-7 Flow 6
LT1074CT7#06PBF FAQ
1.How can I place an order for LT1074CT7#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074CT7#06PBF 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 LT1074CT7#06PBF reliable?
The price and inventory of LT1074CT7#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074CT7#06PBF is usually 5 days.
3.What payment methods are accepted for LT1074CT7#06PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074CT7#06PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1074CT7#06PBF?
LT1074CT7#06PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074CT7#06PBF 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 LT1074CT7#06PBF?
For technical support, including LT1074CT7#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074CT7#06PBF requirements.
6.How does Aetrix verify that LT1074CT7#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1074CT7#06PBF 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 LT1074CT7#06PBF meets industry standards.
7.What is the process for return or replacement of LT1074CT7#06PBF?
All LT1074CT7#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074CT7#06PBF, 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 LT1074CT7#06PBF part is unused and in its original packaging.
Return procedure for LT1074CT7#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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