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Analog Devices Inc. LT1074HVIT7#35PBF
- Part No.:
- LT1074HVIT7#35PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LT1074HVIT7#35PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
LT1074HVIT7#35PBF from Analog Devices (formerly Linear Technology) is a 5A monolithic bipolar step-down switching regulator with integrated 6.5A current-limited power switch, 100kHz fixed-frequency operation, and 64V maximum input voltage. It supports buck, positive-to-negative, and negative-boost topologies and delivers stable output from 2.5V to 50V in industrial power supplies.
For engineers reviewing the LT1074HVIT7#35PBF datasheet, LT1074HVIT7#35PBF pinout, LT1074HVIT7#35PBF application, or LT1074HVIT7#35PBF equivalent, key selection criteria include its HV-rated 64V input capability, 7-pin TO-220 package with programmable current limit, micropower shutdown mode (140–300µA), and analog-multiplier-based feedback for line-transient immunity.
Technical Context
The LT1074HVIT7#35PBF 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 is rated to swing 45V below ground, enabling tapped-inductor configurations delivering up to 10A at 5V.
It features pulse-by-pulse current limiting with 600ns detection/turn-off latency, frequency downshifting (100kHz → 20kHz) when FB drops below 1.3V to maintain control under short-circuit conditions, and a programmable ILIM pin driven by an internal 320µA current source-allowing current limit adjustment from zero to 6.5A via external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 64V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Switch Current Limit | 6.5A typical (ILIM open) - sets peak switch current for overcurrent protection and inductor sizing. |
| Switching Frequency | 100kHz nominal - enables compact magnetics while balancing EMI and efficiency trade-offs. |
| Quiescent Supply Current | 8.5mA typical - ensures low no-load power loss in always-on applications. |
| Shutdown Current | 140–300µA - enables ultra-low-power standby modes in battery-backed systems. |
| Reference Voltage | 2.21V ±1.5% - defines output regulation accuracy and sets feedback divider ratio. |
| Thermal Resistance θJA | 35°C/W - indicates thermal performance on standard 0.5 in² copper pad, critical for 5A continuous operation. |
Pinout & Package
The LT1074HVIT7#35PBF is housed in a 7-lead plastic TO-220 (T7) package with tab connected to GND. The package provides robust thermal dissipation and through-hole mounting compatibility for high-reliability industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Shutdown control input | Drives internal current limit to zero above 2.45V; fully disables regulator below 0.3V (micropower mode). |
| 2 - VC | Error amplifier output | Controls duty cycle via PWM comparator; requires external RC compensation for loop stability. |
| 3 - FB/SENSE | Inverting error amplifier input | Compares output divider voltage against 2.21V reference; also triggers frequency downshift below 1.3V. |
| 4 - GND | Analog and power ground reference | Reference node for internal 2.21V bandgap; must be connected directly to low-current output return path. |
| 5 - ILIM | Current limit programming input | Accepts external resistor to ground to scale current limit from zero to 6.5A (320µA internal source). |
| 6 - VSW | Switch collector output | High-current Darlington NPN collector; swings to –45V relative to GND for negative-output topologies. |
| 7 - VIN | Power input and switch emitter | Supplies internal circuitry and serves as high-side switch emitter; bypass capacitor required for transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation, improving line transient response by >3× vs conventional buck controllers. |
| Tapped-inductor support | –45V VSW swing enables 10A/5V buck outputs using center-tapped inductors-doubling effective current handling without paralleling switches. |
| Programmable current limit | External resistor on ILIM pin allows precise, temperature-stable current threshold setting from zero to 6.5A-critical for custom inductor selection. |
| Micropower shutdown | Reduces total supply current to ≤300µA, enabling long-term battery backup in remote sensors and metering devices. |
| Frequency downshifting | Automatically reduces switching frequency from 100kHz to 20kHz during overload, maintaining stable current limiting even at 0V output. |
Applications
| Industrial DC-DC Power Supply | Positive-to-Negative Voltage Converter |
|---|---|
Use Scenario: Converting 24V or 48V factory bus to regulated 12V or 15V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck controller managing 5A load with input transients up to 64V and ambient temperatures up to 85°C. Use Value: High input voltage rating eliminates need for upstream pre-regulators; 35°C/W θJA enables convection-cooled operation in enclosed cabinets. | Use Scenario: Generating –5V rail from +24V supply for op-amp biasing and analog signal conditioning in test equipment. IC Role / Device Role / Timing Role: Positive-to-negative inverting converter operating in discontinuous conduction mode with 100kHz fixed frequency. Use Value: –45V VSW swing capability allows direct drive of center-tapped inductor-no external level-shifting needed for negative output generation. |
| Negative Boost Converter | Multi-Output Buck System |
Use Scenario: Deriving –12V from a 5V system rail in space-constrained embedded controllers where dual-rail op-amps are used. IC Role / Device Role / Timing Role: Negative boost topology controller with self-boot capability enabling operation down to 5V input in inverting mode. Use Value: Self-boot feature avoids dedicated charge pump IC; 8.5mA quiescent current minimizes impact on primary 5V rail efficiency. | Use Scenario: Simultaneously powering 3.3V FPGA core, 1.2V DDR memory, and 5V USB interface from a single 12V input in industrial gateways. IC Role / Device Role / Timing Role: Primary buck controller feeding auxiliary LDOs or secondary buck stages via tightly regulated 5V intermediate bus. Use Value: 2.21V reference tolerance (±1.5%) ensures <±2% output accuracy across temperature-critical for multi-rail sequencing compliance. |
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 | 40V max input, synchronous MOSFET drivers, 500kHz adjustable frequency, no integrated switch | Requires external high-side/low-side MOSFETs; better suited for high-efficiency, high-frequency designs with tight layout control | Select when >90% efficiency at light loads or >300kHz operation is required; not drop-in due to external FET requirement |
| LM5116MH/NOPB | 100V max input, external N-channel MOSFET driver, 50–750kHz adjustable frequency, no integrated switch | Supports higher input voltages than LT1074HV but lacks onboard switch-requires careful gate-drive design and layout | Choose for 60–100V input systems where thermal management favors discrete FETs; not pin-compatible or functionally identical |
Compared with LTC3775EFE#PBF and LM5116MH/NOPB, the LT1074HVIT7#35PBF offers integrated 5A switching capability and analog-multiplier feedback for superior line regulation-but trades off adjustable frequency and synchronous rectification for simplicity and cost in medium-power industrial supplies.
Availability
LT1074HVIT7#35PBF is available at Aetrix Electronics and suitable for industrial DC-DC power supplies, positive-to-negative converters, negative boost regulators, and multi-output buck systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1074HVIT7#35PBF 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 of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LT1074HV series belongs to Linear's monolithic switching regulator product line, designed specifically for rugged industrial and telecom power conversion where wide input range, high reliability, and topology flexibility are essential.
FAQ
What is the maximum input voltage rating for the LT1074HVIT7#35PBF?
The LT1074HVIT7#35PBF has a maximum input voltage rating of 64V, as specified in the Absolute Maximum Ratings table. This HV variant exceeds the standard LT1074's 45V limit and enables direct operation from 48V industrial buses or unregulated 60V telecom supplies without external clamping or pre-regulation.
Does the LT1074HVIT7#35PBF include an integrated power switch?
Yes, the LT1074HVIT7#35PBF integrates a Darlington NPN power switch rated for 5A continuous output and 6.5A current limit. Unlike controller-only ICs, it requires only external diode, inductor, and capacitors for basic buck operation-reducing BOM count and layout complexity in medium-power designs.
How is current limit programmed on the LT1074HVIT7#35PBF?
Current limit is programmed via the ILIM pin, which sources a precise 320µA internal current. Connecting an external resistor RLIM from ILIM to GND sets the limit as ILIM ≈ (320µA × RLIM) / 2kΩ + 1kΩ. For example, a 7kΩ resistor yields ~3A limit. The LT1074HVIT7#35PBF datasheet provides full derivation and tolerance guidance.
Can the LT1074HVIT7#35PBF operate in positive-to-negative converter topology?
Yes, the LT1074HVIT7#35PBF supports positive-to-negative conversion because its VSW pin is rated to swing 45V below ground. This allows direct connection to the center tap of a tapped inductor or flyback transformer-enabling efficient –5V or –12V generation from +24V or +48V inputs without level-shifting circuitry.
What is the purpose of the frequency downshifting feature in the LT1074HVIT7#35PBF?
The LT1074HVIT7#35PBF reduces switching frequency from 100kHz to ~20kHz when the FB pin voltage falls below 1.3V-typically during severe overload or short-circuit conditions. This extends minimum on-time to maintain controllable current limiting, preventing instability or thermal runaway that would occur at fixed 100kHz with sub-microsecond on-times.
LT1074HVIT7#35PBF 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 Flow 35
LT1074HVIT7#35PBF FAQ
1.How can I place an order for LT1074HVIT7#35PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074HVIT7#35PBF 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#35PBF reliable?
The price and inventory of LT1074HVIT7#35PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074HVIT7#35PBF is usually 5 days.
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LT1074HVIT7#35PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074HVIT7#35PBF 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#35PBF?
For technical support, including LT1074HVIT7#35PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074HVIT7#35PBF requirements.
6.How does Aetrix verify that LT1074HVIT7#35PBF is sourced from the original manufacturer or authorized distributors?
All LT1074HVIT7#35PBF 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#35PBF meets industry standards.
7.What is the process for return or replacement of LT1074HVIT7#35PBF?
All LT1074HVIT7#35PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074HVIT7#35PBF, 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#35PBF part is unused and in its original packaging.
Return procedure for LT1074HVIT7#35PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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