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Analog Devices Inc. LT1074HVCT7#PBF
- Part No.:
- LT1074HVCT7#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LT1074HVCT7#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 5.5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:592
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Product details
Overview
LT1074HVCT7#PBF 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, 64V maximum input voltage, 75V switch-to-input voltage rating, and programmable current limit via the ILIM pin. It supports buck, positive-to-negative, and negative-boost topologies and is used in industrial power supplies requiring high-voltage input tolerance and robust overload protection.
For engineers reviewing the LT1074HVCT7#PBF datasheet, LT1074HVCT7#PBF pinout, LT1074HVCT7#PBF application, or LT1074HVCT7#PBF equivalent, key selection criteria include its 64V input rating, 5A integrated switch, 7-pin programmable current limit interface, micropower shutdown capability (140–300µA), and compatibility with tapped-inductor configurations delivering up to 10A at 5V.
Technical Context
The LT1074HVCT7#PBF implements a classic buck topology enhanced with a true analog multiplier in the feedback loop, enabling near-instantaneous line transient response and input-voltage-independent loop gain. Its Darlington NPN switch is rated for 75V switch-to-input voltage and can swing 45V below ground-enabling use in positive-to-negative and flyback configurations.
It features pulse-by-pulse current limiting with ≈600ns detection/turn-off time, frequency downshifting (100kHz → 20kHz) when FB drops below 1.3V to maintain control under short-circuit conditions, and an error amplifier with 5000µmho transconductance and asymmetrical ±140µA source / −1.1mA sink capability to minimize startup overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 64V - supports wide-range industrial and automotive battery-fed inputs without external pre-regulation. |
| Switch Current Limit | 6.5A (ILIM open), adjustable down to zero - enables precise overcurrent protection tuning for diverse load profiles. |
| Switching Frequency | 100kHz (±10%) - balances EMI, efficiency, and passive component size; downshifts to 20kHz under low-VOUT fault conditions. |
| Quiescent Supply Current | 8.5mA (normal mode), 140–300µA (shutdown) - enables low-power standby operation in energy-sensitive systems. |
| Reference Voltage | 2.21V ±1.5% - precision internal bandgap reference sets output voltage accuracy via external resistor divider. |
| Thermal Resistance θJA | 35°C/W - measured with TO-220 tab soldered to 0.5 in² of 1 oz. copper, enabling 5A operation at ≤85°C ambient with minimal heatsinking. |
| Shutdown Threshold | 2.2–2.7V active, 0.1–0.6V full shutdown - supports clean undervoltage lockout and controlled soft-start via RC networks. |
Pinout & Package
LT1074HVCT7#PBF is housed in a 7-lead plastic TO-220 package (T7) with exposed tab electrically connected to GND. The tab provides low thermal resistance (θJC = 2.5°C/W) and must be soldered to a PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN | Power input and high-side switch source | Supplies internal circuitry and connects to switch emitter; must be bypassed with low-ESR capacitor close to pin. |
| 2: VSW | Switch collector output | Drives external inductor/diode; swings up to 75V above VIN or 45V below GND - enables nonstandard topologies. |
| 3: GND | Analog and power ground reference | Reference for internal 2.21V bandgap; must connect directly to low-current output node to avoid load regulation error. |
| 4: VC | Error amplifier output and compensation node | Drives external RC network for loop stability; asymmetrical ±140µA/−1.1mA drive minimizes startup overshoot. |
| 5: FB/SENSE | Inverting input of error amplifier | Compares output divider voltage against 2.21V reference; also triggers frequency downshift below 1.3V. |
| 6: ILIM | Current limit programming input | Internal 320µA current source sets trip point; external resistor to GND adjusts limit from 0A to 6.5A. |
| 7: SHDN | Shutdown control input | 2.35V threshold initiates duty-cycle halt; ≤0.3V enables full micropower shutdown (≈150µA total supply). |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage dependence in loop gain, enabling stable regulation across 8–64V input range without recompensation. |
| Programmable current limit | External resistor on ILIM pin allows precise trip-point setting from zero to 6.5A - supports foldback and soft-start implementation. |
| Frequency downshifting | Automatically reduces switching frequency from 100kHz to 20kHz as FB falls below 1.3V - maintains controllable current during output shorts. |
| Micropower shutdown | Reduces total supply current to 140–300µA while preserving fast wake-up; 10µA internal pull-up simplifies undervoltage lockout design. |
| 45V negative swing capability | VSW pin rated for 45V below GND - enables direct use in positive-to-negative converters without level-shifting circuitry. |
Applications
| Industrial DC-DC Power Supply | High-Voltage Battery Converter |
|---|---|
Use Scenario: 24V/48V telecom or factory automation system converting 36–60V input to regulated 5V/12V rails. IC Role / Device Role / Timing Role: Primary buck controller with integrated 5A switch, handling line transients and load steps without external MOSFET drivers. Use Value: Eliminates need for external high-voltage gate drivers and discrete current sense, reducing BOM count and layout complexity. | Use Scenario: EV auxiliary power module stepping down 40–64V Li-ion pack voltage to 12V for infotainment and lighting. IC Role / Device Role / Timing Role: High-input-voltage step-down regulator operating at 100kHz with programmable OCP for battery protection. Use Value: 64V absolute max input and 75V switch rating ensure safe operation across full battery SOC and load dump events. |
| Tapped-Inductor 10A Buck | Positive-to-Negative Inverter |
Use Scenario: Industrial PLC I/O module requiring 5V @ 10A from 24V input with minimal footprint. IC Role / Device Role / Timing Role: Controller driving tapped-inductor configuration; VSW's 45V negative swing enables dual-winding operation. Use Value: Achieves 10A output using single IC and compact magnetics - avoids paralleling multiple regulators or external current sharing. | Use Scenario: Signal conditioning board needing isolated –5V rail from existing +12V supply. IC Role / Device Role / Timing Role: Positive-to-negative converter with VSW referenced to output ground, generating regulated negative output. Use Value: No transformer required; uses standard inductor and diode - lowers cost and EMI vs. flyback or charge-pump solutions. |
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 | 42V max input, 3A integrated switch, 3mm × 4mm MSOP package, requires external compensation. | Lower voltage/current rating; better suited for space-constrained, lower-power applications. | Select LTC3632EMSE#PBF only if input <42V and output ≤3A; not drop-in due to different pinout and compensation requirements. |
| LM5088MHX/NOPB | 65V max input, 5A external MOSFET driver, no integrated switch, requires external current sense and gate driver. | Higher design flexibility but increased component count; lacks integrated current limit and analog multiplier benefits. | Choose LM5088MHX/NOPB when higher efficiency at light loads or custom FET selection is required; adds complexity versus LT1074HVCT7#PBF's monolithic integration. |
Compared with LTC3632EMSE#PBF and LM5088MHX/NOPB, LT1074HVCT7#PBF uniquely combines 64V input tolerance, 5A integrated switch, analog multiplier-based line regulation, and programmable current limit in a through-hole TO-220 package - making it optimal for ruggedized, medium-power industrial supplies where layout simplicity and transient immunity are critical.
Availability
LT1074HVCT7#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-based converters, and ruggedized embedded systems requiring stable component supply, long-term lifecycle support, and proven high-voltage reliability.
Supply support for LT1074HVCT7#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 LT1074HV series.
The LT1074HV product line was designed for high-reliability industrial and automotive power conversion, emphasizing wide-input-voltage operation, robust fault protection, and topology flexibility beyond basic buck regulation.
FAQ
What is the maximum input voltage rating for the LT1074HVCT7#PBF?
The LT1074HVCT7#PBF has an absolute maximum input voltage rating of 64V, as specified in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1074 (45V max) and enables use in 48V battery systems and industrial supplies with high line transients. Operation above 60V requires verification of derating curves and thermal management per the datasheet.
Can the LT1074HVCT7#PBF be used in a positive-to-negative converter configuration?
Yes, the LT1074HVCT7#PBF supports positive-to-negative conversion due to its VSW pin's ability to swing 45V below ground. In this topology, the switch output drives the inductor's grounded end, enabling generation of a regulated negative output from a positive input - as demonstrated in Application Note AN44 and Figure TA03 of the LT1074/LT1076 datasheet.
How is current limit programmed on the LT1074HVCT7#PBF?
Current limit on the LT1074HVCT7#PBF is set via the ILIM pin, which sources a precise 320µA internal current. Connecting an external resistor RLIM from ILIM to GND sets the trip point as ILIM ≈ (320µA × RLIM) / (2kΩ) + 1kΩ. For example, a 7kΩ resistor yields ~3A limit. The pin also supports foldback limiting and soft-start when combined with capacitors.
Does the LT1074HVCT7#PBF require external compensation components?
Yes, the LT1074HVCT7#PBF requires external RC compensation connected between the VC and GND pins to stabilize the control loop. The error amplifier's transconductance and output impedance interact with this network to set phase margin and bandwidth. Typical values are selected based on output voltage, inductance, and load range - guidance is provided in Linear's Application Note 44 and the "Error Amplifier" section of the datasheet.
What is the purpose of frequency downshifting in the LT1074HVCT7#PBF?
Frequency downshifting in the LT1074HVCT7#PBF reduces switching frequency from 100kHz to ~20kHz when the FB pin voltage drops below 1.3V - typically during severe overload or short-circuit conditions. This extends minimum on-time to maintain controllable current limiting when duty cycle would otherwise fall below ~2%, preventing loss of regulation and improving fault robustness.
LT1074HVCT7#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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-7
LT1074HVCT7#PBF FAQ
1.How can I place an order for LT1074HVCT7#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1074HVCT7#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 LT1074HVCT7#PBF reliable?
The price and inventory of LT1074HVCT7#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1074HVCT7#PBF is usually 5 days.
3.What payment methods are accepted for LT1074HVCT7#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1074HVCT7#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1074HVCT7#PBF?
LT1074HVCT7#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1074HVCT7#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 LT1074HVCT7#PBF?
For technical support, including LT1074HVCT7#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1074HVCT7#PBF requirements.
6.How does Aetrix verify that LT1074HVCT7#PBF is sourced from the original manufacturer or authorized distributors?
All LT1074HVCT7#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 LT1074HVCT7#PBF meets industry standards.
7.What is the process for return or replacement of LT1074HVCT7#PBF?
All LT1074HVCT7#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1074HVCT7#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 LT1074HVCT7#PBF part is unused and in its original packaging.
Return procedure for LT1074HVCT7#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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