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Analog Devices Inc. LT1072HVCT#PBF
- Part No.:
- LT1072HVCT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1072HVCT#PBF.pdf
- Description:
- IC REG BCK BST ADJ 1.25A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,050
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Product details
Overview
LT1072HVCT#PBF from Analog Devices (formerly Linear Technology) is a monolithic high-efficiency current-mode switching regulator IC with an integrated 1.25A power switch, operating from 3V to 60V input and delivering up to 20W output power in buck, boost, flyback, forward, inverting, and Cuk topologies. It features 40kHz fixed-frequency operation, 6mA quiescent current, and flyback-regulated isolated outputs without optocouplers.
For engineers reviewing the LT1072HVCT#PBF datasheet, LT1072HVCT#PBF pinout, LT1072HVCT#PBF application, or LT1072HVCT#PBF equivalent, key selection criteria include its 60V max input rating, 75V switch breakdown voltage, shutdown mode (50µA), adaptive anti-saturation drive, and support for fully floating outputs in flyback mode - critical for offline converters, battery upconverters, and isolated dual-rail supplies.
Technical Context
The LT1072HVCT#PBF implements current-mode control with a 40kHz oscillator, enabling fast line transient response and simplified loop compensation. Its internal 1.25A switch uses adaptive anti-saturation drive to maintain efficiency across wide load ranges, while the error amplifier (gm = 3000–6000 µmho) and flyback amplifier (gm = 150–650 µmho) provide precise regulation in both standard and isolated configurations.
It supports external synchronization (48–70kHz), programmable current limiting via the VC pin, soft-start via capacitor coupling, and shutdown activation at VC < 0.15V. The flyback regulation mode uses a dedicated 16.3V reference (±1.3V) and blanking delay (~1.5µs) to reject leakage spikes, enabling stable multi-output isolation without auxiliary windings or optocouplers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and offline inputs without pre-regulation |
| Switch Breakdown Voltage | 75V - enables safe operation in 48V systems and flyback designs with reflected voltage margins |
| Max Switch Current | 1.25A (guaranteed) - delivers ≥20W in TO-220 package at moderate duty cycles |
| Quiescent Current | 6mA - minimizes no-load power loss in battery-powered or standby-critical systems |
| Shutdown Current | 50µA typical - meets ultra-low-power standby requirements per IEC 62301 |
| Switching Frequency | 40kHz ±5kHz - balances EMI, magnetics size, and efficiency for medium-power SMPS |
| Feedback Reference | 1.244V ±20mV - enables precise output voltage setting with standard resistor dividers |
Pinout & Package
LT1072HVCT#PBF is supplied in a 5-lead TO-220 package (T package), with case connected to GND. Thermal resistance θJA = 50°C/W and θJC = 8°C/W enable operation without heatsink up to ~15W in ambient air.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Primary supply rail (3–60V); connects to input capacitor and inductor feed |
| VC | Error Amplifier Output / Control | Current-source output for frequency compensation, current limit adjustment, soft-start, and shutdown |
| GND | Ground Reference | Power and signal ground; TO-220 case is internally tied to this pin |
| FB | Feedback Input | High-impedance node sensing output voltage; 1.244V reference sets regulation point |
| VSW | Switch Drain Output | Drain of internal NPN switch; connects to inductor/diode in buck/boost/flyback topologies |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25A switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity in ≤20W converters |
| Flyback-regulated mode | Enables fully isolated, optocoupler-free outputs using transformer flyback pulse amplitude regulation |
| Adaptive anti-saturation drive | Maintains high efficiency across 0.1A–1.25A loads by dynamically optimizing base drive to prevent transistor saturation |
| External synchronization | Accepts 48–70kHz sync pulses on VC pin, allowing EMI spread-spectrum or multi-phase interleaving |
| Self-protection | Includes current-limit, thermal foldback (untested but functional), and shutdown - reduces need for external fault circuitry |
Applications
| Offline AC/DC Converter | Battery-Powered Upconverter |
|---|---|
Use Scenario: Converting rectified 85–265VAC to regulated 12V/1A for industrial sensors. IC Role / Device Role / Timing Role: Primary-side controller in discontinuous conduction mode (DCM) flyback topology, regulating output via reflected flyback pulse. Use Value: Eliminates optocoupler and TL431, reducing component count by ≥4 and improving long-term reliability. | Use Scenario: Boosting 3.6V Li-ion battery to 12V for portable instrumentation. IC Role / Device Role / Timing Role: High-efficiency boost converter with 6mA quiescent current preserving battery runtime. Use Value: Delivers >88% efficiency at 0.5A load, extending usable battery life by >15% vs. linear solutions. |
| Isolated Dual-Rail Supply | Industrial Sensor Power |
Use Scenario: Generating ±15V from 24V DC bus for op-amp front-ends in PLC analog modules. IC Role / Device Role / Timing Role: Inverting buck-boost controller with floating secondary winding for symmetrical outputs. Use Value: Achieves <±1.5% cross-regulation between rails without post-regulation LDOs. | Use Scenario: Providing 5V/2.5A logic supply from 12–48V field bus in hazardous-area transmitters. IC Role / Device Role / Timing Role: Buck regulator with 60V input rating and shutdown capability for safe hot-swap insertion. Use Value: Withstands 60V transients per IEC 61000-4-5 Level 4, eliminating need for upstream TVS clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1072CT#PBF | Lower 40V max input and 65V switch breakdown vs. HV version's 60V/75V | Not suitable for 48V+ input or high-reflected-voltage flyback designs | Select only if input stays ≤40V and isolation margin is ≥10V |
| LT1071HVCT#PBF | 2.5A switch (vs. 1.25A), same 60V/75V ratings, identical pinout and footprint | Supports higher output power (≥35W) without redesign; requires larger inductor and diode | Drop-in upgrade path when load current exceeds 1.25A or power demand rises above 20W |
Compared with LT1072CT#PBF, the LT1072HVCT#PBF provides essential 20V headroom for 48V systems and safer flyback operation; versus LT1071HVCT#PBF, it trades half the switch current for lower gate drive loss and reduced thermal stress in ≤20W designs.
Availability
LT1072HVCT#PBF is available at Aetrix Electronics and suitable for offline AC/DC converters, battery-powered upconverters, and industrial sensor power supplies requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1072HVCT#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 technical and manufacturing continuity for legacy Linear power products.
The LT1072HVCT#PBF belongs to Linear's high-voltage monolithic switching regulator family, designed specifically for robust, low-component-count DC/DC conversion in harsh environments - including industrial automation, energy metering, and telecom infrastructure.
FAQ
What is the maximum input voltage rating for the LT1072HVCT#PBF?
The LT1072HVCT#PBF has a maximum input voltage rating of 60V, as specified in the Absolute Maximum Ratings table. This is distinct from the standard LT1072CT#PBF (40V max). Exceeding 60V risks permanent damage to the internal switch, whose breakdown voltage is rated at 75V - providing necessary margin for transient spikes in offline applications.
Does the LT1072HVCT#PBF support isolated flyback operation without an optocoupler?
Yes, the LT1072HVCT#PBF supports true optocoupler-free isolated flyback regulation via its dedicated flyback mode. When the FB pin is pulled below 0.54V, the IC switches to regulating the amplitude of the transformer's flyback pulse using an internal 16.3V reference. This eliminates the need for optocouplers or auxiliary windings while maintaining tight output regulation across load and line variations.
What package type is used for the LT1072HVCT#PBF?
The LT1072HVCT#PBF uses a 5-lead TO-220 package (T package), with the metal tab electrically connected to the GND pin. Its thermal characteristics - θJA = 50°C/W and θJC = 8°C/W - allow reliable operation up to ~15W without a heatsink under natural convection, making it suitable for space-constrained industrial power supplies.
How does the LT1072HVCT#PBF achieve current-mode control?
The LT1072HVCT#PBF implements current-mode control by comparing sensed switch current against a threshold set by the VC pin voltage. At each 40kHz oscillator cycle, the internal switch turns on; it turns off when current reaches the trip level. This architecture provides inherent cycle-by-cycle current limiting, improved line transient response, and simplified loop compensation - all realized without external current-sense resistors.
Can the LT1072HVCT#PBF be synchronized to an external clock?
Yes, the LT1072HVCT#PBF supports external synchronization from 48kHz to 70kHz by pulling the VC pin to ground with a narrow (<1µs) pulse via an external transistor. This feature enables EMI reduction through frequency dithering or phase interleaving in multi-rail systems, while preserving regulation accuracy - with typical offset shift <2.2mV under defined sync conditions.
LT1072HVCT#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up, Step-Down, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost, Cuk, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 75V (Switch)
- Current - Output:
- 1.25A (Switch)
- Frequency - Switching:
- 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 100°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LT1072HVCT#PBF FAQ
1.How can I place an order for LT1072HVCT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1072HVCT#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 LT1072HVCT#PBF reliable?
The price and inventory of LT1072HVCT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1072HVCT#PBF is usually 5 days.
3.What payment methods are accepted for LT1072HVCT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1072HVCT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1072HVCT#PBF?
LT1072HVCT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1072HVCT#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 LT1072HVCT#PBF?
For technical support, including LT1072HVCT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1072HVCT#PBF requirements.
6.How does Aetrix verify that LT1072HVCT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1072HVCT#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 LT1072HVCT#PBF meets industry standards.
7.What is the process for return or replacement of LT1072HVCT#PBF?
All LT1072HVCT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1072HVCT#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 LT1072HVCT#PBF part is unused and in its original packaging.
Return procedure for LT1072HVCT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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