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Analog Devices Inc. LT1074HVIT7#06PBF
- Part No.:
- LT1074HVIT7#06PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7
- Datasheet:
-
LT1074HVIT7#06PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,285
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Product details
Overview
LT1074HVIT7#06PBF 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 up to 10A output in tapped-inductor mode, features 100kHz fixed-frequency operation, 8.5mA quiescent current, and programmable current limit - used in industrial power supplies and high-voltage DC-DC conversion.
For engineers reviewing the LT1074HVIT7#06PBF datasheet, LT1074HVIT7#06PBF pinout, LT1074HVIT7#06PBF application, or LT1074HVIT7#06PBF equivalent, key selection considerations include its HV-rated 60V input capability, 7-pin TO-220 package with SHDN/ILIM pins, true analog multiplier feedback for line transient immunity, and verified use in 5V/10A tapped-inductor designs per AN44.
Technical Context
The LT1074HVIT7#06PBF 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 and inverting configurations.
It integrates pulse-by-pulse current limiting via an internal 320µA ILIM current source, with shutdown control through a dedicated SHDN pin (2.45V threshold), and frequency downshifting below 1.3V FB to maintain short-circuit control at ultra-low duty cycles - all within a single 7-pin TO-220 package with exposed tab grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 60V - supports wide industrial input rails without external pre-regulation |
| Switch Current Limit | 6.5A typical (ILIM open) - enables robust 5A continuous output with margin for peak loads |
| Switching Frequency | 100kHz ±10% - balances efficiency, EMI, and inductor size for mid-power applications |
| Quiescent Supply Current | 8.5mA typical - minimizes no-load power loss in always-on systems |
| Feedback Reference Voltage | 2.21V ±1.5% - precision trimmed reference enables accurate output regulation across temperature |
| Thermal Resistance θJA | 35°C/W - measured with 0.5 in² 1 oz copper, enabling 5A operation with moderate heatsinking |
| Shutdown Threshold | 2.45V (enable), 0.3V (full micropower) - allows clean undervoltage lockout and low-IQ standby |
Pinout & Package
LT1074HVIT7#06PBF is housed in a 7-lead plastic TO-220 package (T7) with exposed tab electrically connected to GND. The package supports standard straight-lead mounting (flow code 06) and provides thermal relief via direct tab-to-heatsink contact.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input & switch source | Supplies internal circuitry and serves as high-current switch return path - requires low-ESR bypass capacitor |
| 2 - VSW | Switch collector output | Drives external inductor/diode; swings 40V below GND - enables negative-output and tapped-inductor topologies |
| 3 - GND | Analog & power ground reference | Reference for internal 2.21V bandgap; must connect directly to low-noise output return to avoid load regulation error |
| 4 - VC | Error amplifier output | Controls duty cycle via transconductance amplifier; connects to RC compensation network for loop stability |
| 5 - FB/SENSE | Inverting error amplifier input | Compares output divider voltage against 2.21V reference; also triggers frequency downshift below 1.3V |
| 6 - ILIM | Current limit programming | Accepts external resistor to ground to scale current limit from 6.5A down to zero - enables foldback protection |
| 7 - SHDN | Shutdown control input | Active-high enable (≥2.45V); pulls ILIM low when asserted - supports UVLO, soft-start, and delayed turn-on |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation - ensures consistent transient response across 8–60V input range |
| 40V switch swing below GND | Enables reliable positive-to-negative and tapped-inductor buck converters without external level-shifting circuitry |
| Programmable current limit | External resistor on ILIM pin sets precise trip point from 0A to 6.5A - supports custom overcurrent protection and foldback |
| Frequency downshifting | Oscillator reduces from 100kHz to ~20kHz as FB drops from 1.3V to 0.5V - maintains stable current limiting during output shorts |
| Micropower shutdown | Reduces supply current to 140–300µA - enables battery-backed or energy-sensitive standby modes |
Applications
| Industrial 24V/48V DC-DC Conversion | High-Current Tapped-Inductor Buck |
|---|---|
Use Scenario: Converting 36V rail to regulated 5V for PLC I/O modules requiring >3A continuous current and high noise immunity. IC Role / Device Role / Timing Role: Primary buck controller with integrated 60V switch and analog multiplier feedback loop. Use Value: Maintains ±1% output regulation across 20–50V input variation and 0–5A load steps - validated per LT1074•TA01 schematic. | Use Scenario: Generating 5V/10A from 24V input in telecom power shelf using tapped-inductor topology to reduce conduction losses. IC Role / Device Role / Timing Role: High-side switch driver with 40V negative swing capability and 100kHz timing control. Use Value: Achieves >92% efficiency at full load (LT1074•TPC27), eliminating need for external MOSFET drivers or synchronous rectifiers. |
| Positive-to-Negative Converter | Wide-Input Industrial Power Supply |
Use Scenario: Deriving –5V/1A from 12–40V input for op-amp biasing in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Inverting buck-boost controller leveraging VSW's 40V negative swing and internal current limiting. Use Value: Delivers stable –5V output with <10mV ripple under 1A load - confirmed in LT1074•TA03 reference design. | Use Scenario: Main 12V/5A supply in factory automation HMI panel powered from unregulated 24–60V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator with UVLO, programmable current limit, and thermal protection. Use Value: Supports seamless operation across full 24–60V input range with automatic frequency scaling below 1.3V FB 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 | 40V max input, 10A peak, external MOSFETs, 500kHz sync capability | Higher efficiency at light load; requires gate drivers and layout for dual FETs | Choose for >94% efficiency targets and flexible frequency synchronization |
| LM5118MH/NOPB | 100V max input, 2.5A integrated switch, 50–500kHz adjustable frequency | Wider input range but lower current rating; lacks analog multiplier feedback | Choose for >60V input systems where 2.5A output suffices and line transient immunity is secondary |
Compared with LTC3775EFE#PBF and LM5118MH/NOPB, the LT1074HVIT7#06PBF offers unique analog multiplier-based line regulation and 40V negative switch swing - critical for tapped-inductor and inverting topologies - while delivering 5A with minimal external components, unlike the controller-only LTC3775 or lower-current LM5118.
Availability
LT1074HVIT7#06PBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC-DC modules, and factory automation equipment requiring stable component supply, long-term lifecycle support, and proven reliability in high-voltage buck conversion.
Supply support for LT1074HVIT7#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 full support for legacy Linear regulator products including the LT1074 family.
The LT1074HV series was designed specifically for high-input-voltage industrial and telecom power conversion, emphasizing ruggedness, wide operating range, and topology flexibility - especially in tapped-inductor and inverting configurations where switch swing below ground is essential.
FAQ
What is the maximum input voltage rating for the LT1074HVIT7#06PBF?
The LT1074HVIT7#06PBF has an absolute maximum input voltage rating of 64V, with guaranteed operation from 8V to 60V in buck configuration. This HV variant exceeds the standard LT1074 (45V max) and enables direct connection to 48V industrial buses and telecom -48V return-referenced systems without pre-regulation.
Does the LT1074HVIT7#06PBF support negative-output converter topologies?
Yes, the LT1074HVIT7#06PBF supports positive-to-negative conversion because its VSW pin is specified to swing 40V below ground. This capability is explicitly validated in the LT1074•TA03 reference design, which generates –5V/1A from a 4.5–40V input using standard external components and no level shifters.
How is current limit programmed on the LT1074HVIT7#06PBF?
Current limit is programmed via an external resistor from the ILIM pin to GND. With ILIM open, the device defaults to 6.5A. For a target limit ILIM, use RLIM = ILIM(2kΩ) + 1kΩ (e.g., 7kΩ for 3A). This relationship is confirmed in the Electrical Characteristics table and Figure 8 of the datasheet for the LT1074HVIT7#06PBF.
What is the purpose of the FB pin's frequency downshifting function in the LT1074HVIT7#06PBF?
The FB pin's frequency downshifting reduces switching frequency from 100kHz to ~20kHz as FB voltage drops from 1.3V to 0.5V. This ensures minimum on-time remains sufficient to control output current during severe overload or short-circuit conditions - a feature critical for maintaining regulation integrity in the LT1074HVIT7#06PBF's high-current applications.
Can the LT1074HVIT7#06PBF be used in a 5V fixed-output configuration without external resistors?
No - the LT1074HVIT7#06PBF requires external FB divider resistors to set output voltage. Unlike the pin-compatible LT1076-5 (fixed 5V), the LT1074HVIT7#06PBF is adjustable from 2.5V to 50V via R1/R2. A typical 5V design uses R1 = 2.8kΩ and R2 = 2.21kΩ, as shown in LT1074•TA01 and confirmed in the Applications section of the LT1074HVIT7#06PBF datasheet.
LT1074HVIT7#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):
- 64V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 45V
- 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 6
LT1074HVIT7#06PBF FAQ
1.How can I place an order for LT1074HVIT7#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074HVIT7#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 LT1074HVIT7#06PBF reliable?
The price and inventory of LT1074HVIT7#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074HVIT7#06PBF is usually 5 days.
3.What payment methods are accepted for LT1074HVIT7#06PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074HVIT7#06PBF transactions.
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4.How is shipping managed for LT1074HVIT7#06PBF?
LT1074HVIT7#06PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074HVIT7#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 LT1074HVIT7#06PBF?
For technical support, including LT1074HVIT7#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074HVIT7#06PBF requirements.
6.How does Aetrix verify that LT1074HVIT7#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1074HVIT7#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 LT1074HVIT7#06PBF meets industry standards.
7.What is the process for return or replacement of LT1074HVIT7#06PBF?
All LT1074HVIT7#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074HVIT7#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 LT1074HVIT7#06PBF part is unused and in its original packaging.
Return procedure for LT1074HVIT7#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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