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Analog Devices Inc. LT1074HVCT7#06PBF
- Part No.:
- LT1074HVCT7#06PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7
- Datasheet:
-
LT1074HVCT7#06PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,282
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Product details
Overview
LT1074HVCT7#06PBF from Analog Devices (formerly Linear Technology) is a 5A monolithic bipolar step-down switching regulator in a 7-lead TO-220 package, featuring 64V maximum input voltage, 100kHz fixed switching frequency, and programmable current limit up to 6.5A. It supports buck, positive-to-negative, and tapped-inductor topologies for industrial power supplies and high-voltage DC/DC conversion.
For engineers reviewing the LT1074HVCT7#06PBF datasheet, LT1074HVCT7#06PBF pinout, LT1074HVCT7#06PBF application, or LT1074HVCT7#06PBF equivalent, key selection criteria include its HV-rated 64V input capability, true analog multiplier feedback for line transient immunity, 7-pin ILIM/SHDN configurability, and compatibility with tapped-inductor designs delivering up to 10A at 5V.
Technical Context
The LT1074HVCT7#06PBF implements a classic buck topology enhanced with an on-chip 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 negative-output and tapped-inductor configurations.
It integrates pulse-by-pulse current limiting, micropower shutdown (140–300µA), and frequency downshifting (100kHz → 20kHz) when FB drops below 1.3V-critical for short-circuit current control. The 7-pin T7 package provides dedicated SHDN and ILIM pins for undervoltage lockout, soft-start, and adjustable current limit from 0A to 6.5A.
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) - enables 5A continuous output with headroom for peak loads and inrush. |
| Switching Frequency | 100kHz ±10% - balances EMI, efficiency, and external component size; downshifts to 20kHz under low-VOUT fault conditions. |
| Quiescent Current | 8.5mA typical - minimizes no-load power loss in always-on systems. |
| Reference Voltage | 2.21V ±1.5% - precision internal bandgap reference sets output accuracy via external resistor divider. |
| Thermal Resistance θJA | 35°C/W - measured with 0.5 in² 1 oz. copper pad; enables 5A operation at ≤85°C ambient with standard heatsinking. |
| Shutdown Current | 140–300µA - ultra-low standby draw for battery-backed or energy-sensitive applications. |
Pinout & Package
LT1074HVCT7#06PBF is housed in a 7-lead plastic TO-220 (T7) package with tab connected to GND. The package features formed straight leads (flow code 06) and is designed for through-hole mounting with thermal relief to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Power input and switch source | Supplies internal circuitry and connects to high-current switch emitter; requires low-ESR input capacitor placed adjacent to pin. |
| 2 - VSW | Switch collector output | Drives external inductor/diode; swings to –45V relative to GND, enabling negative-output and tapped-inductor topologies. |
| 3 - GND | Analog and power ground reference | Reference for internal 2.21V bandgap and error amplifier; must connect directly to low-current output return path to avoid load regulation error. |
| 4 - VC | Error amplifier output | Drives external compensation network (RC/CC); asymmetrical ±140µA/1.1mA sink-source capability reduces startup overshoot. |
| 5 - FB/SENSE | Inverting input of error amplifier | Compares output voltage (via resistor divider) against 2.21V reference; also triggers frequency downshift below 1.3V during faults. |
| 6 - ILIM | Current limit programming | Internal 320µA current source sets limit; open = 6.5A; grounded via resistor enables adjustable limit (e.g., 7kΩ = ~3A). |
| 7 - SHDN | Shutdown control | 2.45V threshold enables duty-cycle halt; <0.3V initiates full micropower shutdown (140–300µA supply current). |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation, improving line transient response by >3× vs. conventional PWM controllers. |
| 45V switch-to-ground rating | Enables direct drive of tapped-inductor buck converters delivering 10A at 5V, or robust positive-to-negative conversion without level-shifting. |
| Programmable current limit (0–6.5A) | External resistor on ILIM pin allows precise overcurrent protection tuning without changing layout or BOM for different output current requirements. |
| Micropower shutdown mode | Reduces total supply current to ≤300µA, supporting battery-powered systems requiring multi-week standby life. |
| Frequency downshifting (100kHz → 20kHz) | Maintains stable current limiting during output shorts by extending minimum on-time, preventing control loss at ultra-low duty cycles. |
Applications
| Industrial DC/DC Power Supply | High-Voltage Battery Converter |
|---|---|
Use Scenario: Converting 24–60V industrial bus to regulated 5V/3.3V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck controller managing 5A continuous output with fast line regulation and fault recovery. Use Value: 64V input rating eliminates need for upstream pre-regulator; analog multiplier ensures <50µs recovery from 20V input step. | Use Scenario: Regulating 36–58V LiFePO₄ battery stack to 12V for vehicle telematics and CAN bus gateways. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator with UVLO and thermal foldback for automotive-grade reliability. Use Value: SHDN pin enables clean system-level power sequencing; 35°C/W θJA sustains full 5A output at 85°C ambient. |
| Tapped-Inductor 10A Buck | Positive-to-Negative Inverter |
Use Scenario: Generating 5V@10A from 20–35V input in space-constrained telecom power shelves. IC Role / Device Role / Timing Role: Controller driving center-tapped inductor with synchronous rectification support. Use Value: VSW swing to –45V enables efficient 10A operation using single LT1074HVCT7#06PBF instead of dual-phase ICs. | Use Scenario: Creating –5V@1A rail from +12V main supply for op-amp biasing and analog signal conditioning. IC Role / Device Role / Timing Role: Inverting buck-boost controller with integrated switch and current sensing. Use Value: No external level shifters required; built-in current limit and shutdown simplify fault management in mixed-signal systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMSE#PBF | 40V max input, 4A integrated MOSFET, 500kHz sync operation, requires external compensation. | Better efficiency at light loads; unsuitable for >40V inputs or >5A outputs. | Select LTC3642 for compact 40V/4A designs needing higher frequency and lower quiescent current. |
| LM5088MHX/NOPB | 65V max input, 5A external MOSFET driver, no integrated switch, 1MHz capable. | Higher flexibility in MOSFET selection and thermal design; requires more external components. | Select LM5088 for designs requiring >100kHz operation, custom FET optimization, or improved thermal partitioning. |
Compared with LTC3642EMSE#PBF and LM5088MHX/NOPB, LT1074HVCT7#06PBF uniquely combines 64V input, 5A integrated bipolar switch, analog multiplier feedback, and 7-pin configurability-making it optimal for cost-sensitive, high-reliability 5A buck or inverting supplies where board space and component count are constrained.
Availability
LT1074HVCT7#06PBF is available at Aetrix Electronics and suitable for industrial automation, telecom power systems, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and proven ruggedness in high-voltage DC/DC conversion.
Supply support for LT1074HVCT7#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 of high-performance analog and power management ICs with rigorous qualification and long-term product support.
The LT1074HV series belongs to Linear's high-voltage monolithic switching regulator product line, designed specifically for robust, low-component-count DC/DC conversion in industrial, military, and telecom applications where input voltage exceeds 40V.
FAQ
What is the maximum input voltage rating for the LT1074HVCT7#06PBF?
The LT1074HVCT7#06PBF has an absolute maximum input voltage rating of 64V, confirmed in the Absolute Maximum Ratings table. This HV variant is distinct from the standard LT1074 (45V max), enabling direct operation from 48V telecom or 60V industrial buses without derating or external clamping. Operation above 60V requires careful thermal design due to increased power dissipation in the internal switch.
Can the LT1074HVCT7#06PBF be used in a positive-to-negative converter configuration?
Yes, the LT1074HVCT7#06PBF supports positive-to-negative conversion, as explicitly documented in the Applications section and Figure TA03. Its VSW pin is rated to swing 45V below ground, allowing direct connection to the center tap of an inductor or transformer secondary. This eliminates the need for external level-shifting circuitry and enables compact, high-efficiency inverter designs delivering up to 1A at –5V from a +12V input.
How is current limit adjusted on the LT1074HVCT7#06PBF?
Current limit on the LT1074HVCT7#06PBF is adjusted via the ILIM pin (Pin 6), which sources a precise 320µA internal current. Connecting an external resistor RLIM from ILIM to GND sets the limit per RLIM = ILIM(2kΩ) + 1kΩ. For example, a 7kΩ resistor yields ~3A limit. Leaving ILIM open defaults to 6.5A. This adjustment is validated in the Electrical Characteristics table and Application Note 44.
Does the LT1074HVCT7#06PBF include frequency downshifting, and when does it activate?
Yes, the LT1074HVCT7#06PBF implements automatic frequency downshifting from 100kHz to 20kHz when the FB pin voltage falls below 1.3V-typically during output overload or short-circuit conditions. This feature extends minimum on-time to maintain control at ultra-low duty cycles, as detailed in Figures PD03 and TPC19. It is intrinsic to the oscillator architecture and requires no external components.
What is the thermal resistance (θJA) of the LT1074HVCT7#06PBF in its T7 package?
The LT1074HVCT7#06PBF in the 7-lead TO-220 (T7) package has a specified θJA of 35°C/W, measured with 0.5 in² of 1 oz. copper on the PCB. This value is confirmed in the Package Information table on page 2 of the datasheet and enables full 5A output at up to 85°C ambient temperature when properly heatsinked-critical for convection-cooled industrial enclosures.
LT1074HVCT7#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):
- 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
LT1074HVCT7#06PBF FAQ
1.How can I place an order for LT1074HVCT7#06PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074HVCT7#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 LT1074HVCT7#06PBF reliable?
The price and inventory of LT1074HVCT7#06PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074HVCT7#06PBF is usually 5 days.
3.What payment methods are accepted for LT1074HVCT7#06PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074HVCT7#06PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1074HVCT7#06PBF?
LT1074HVCT7#06PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074HVCT7#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 LT1074HVCT7#06PBF?
For technical support, including LT1074HVCT7#06PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074HVCT7#06PBF requirements.
6.How does Aetrix verify that LT1074HVCT7#06PBF is sourced from the original manufacturer or authorized distributors?
All LT1074HVCT7#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 LT1074HVCT7#06PBF meets industry standards.
7.What is the process for return or replacement of LT1074HVCT7#06PBF?
All LT1074HVCT7#06PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074HVCT7#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 LT1074HVCT7#06PBF part is unused and in its original packaging.
Return procedure for LT1074HVCT7#06PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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