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Analog Devices Inc. LT1071HVCT#PBF
- Part No.:
- LT1071HVCT#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1071HVCT#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 2.5A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,656
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Product details
Overview
LT1071HVCT#PBF from Analog Devices (formerly Linear Technology) is a high-voltage monolithic switching regulator IC with integrated 2.5A power switch, operating from 3V to 60V input and delivering up to 50W output power in buck/boost/flyback topologies. It features 40kHz fixed-frequency current-mode control, 6mA quiescent current, and flyback regulation mode for isolated outputs. Used in off-line converters, battery upconverters, and industrial DC-DC supplies.
For engineers reviewing the LT1071HVCT#PBF datasheet, LT1071HVCT#PBF pinout, LT1071HVCT#PBF application, or LT1071HVCT#PBF equivalent, this page provides verified technical context, package-specific pin functions, real-world application cards, and two validated alternative parts - all grounded in the official LT1070/LT1071 datasheet (10701fe) and Linear Technology's application notes AN19 and AN25.
Technical Context
The LT1071HVCT#PBF implements current-mode switching using an internal 2.5A/75V DMOS switch, adaptive antisaturation drive, and a 40kHz oscillator. Its error amplifier delivers 4400 µmho transconductance (typ), and flyback regulation uses a dedicated 16.3V reference with 0.03%/V line regulation.
It supports fully floating isolated outputs via flyback mode without optocouplers, employs a 0.04Ω sense resistor for current sensing, and achieves shutdown current of 50µA (typ) when VC ≤ 0.15V. The device operates across –40°C to 125°C (industrial grade) and integrates overcurrent, thermal, and short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - enables direct operation from 48V telecom rails or unregulated off-line rectified inputs without pre-regulation. |
| Switch Current Limit | 2.5A (min) at ≤50% duty cycle - sets maximum deliverable output power in buck/boost configurations (e.g., ~30W @ 12V out). |
| Reference Voltage (FB) | 1.244V (typ) - defines output voltage accuracy via external resistor divider; tolerance ±1.6% over temperature. |
| Flyback Reference Voltage | 16.3V (typ) - used to regulate isolated secondary outputs by sensing reflected flyback pulse amplitude. |
| Quiescent Supply Current | 6mA (typ) - ensures low standby loss in always-on industrial power supplies. |
| Shutdown Supply Current | 50µA (typ) - allows ultra-low-power sleep mode for battery-backed systems. |
| Switching Frequency | 40kHz (typ) - balances magnetics size vs. EMI; fixed frequency simplifies filter design and avoids subharmonic instability. |
Pinout & Package
LT1071HVCT#PBF is housed in a 5-lead plastic TO-220 package (T-package), with the case (tab) internally connected to VIN for thermal conduction and electrical isolation from GND. Pin 1 is VIN, Pin 2 is VSW, Pin 3 is GND, Pin 4 is FB, Pin 5 is VC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 3–60V supply; also connects to metal tab for heatsinking - must be electrically isolated from PCB ground plane if tab is not tied to VIN. |
| VSW (Pin 2) | Switch node output | Drives external inductor/diode network; swings from VIN to ~–0.5V during freewheeling; requires snubber for high-dV/dt flyback designs. |
| GND (Pin 3) | Power and signal reference | Common return for internal circuitry, feedback divider, and compensation network; separate from VIN tab to avoid noise coupling. |
| FB (Pin 4) | Feedback input | Senses output voltage via resistor divider; pulls low to enable flyback regulation mode; clamped between 0.25V and 2.3V internally. |
| VC (Pin 5) | Error amplifier output / control | Provides gm-type error signal (0.9–2.0V normal range); used for soft-start (capacitor), current limit (voltage clamp), and shutdown (≤0.15V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 2.5A/75V DMOS switch | Eliminates external MOSFET in ≤50W applications; reduces BOM count and layout complexity in buck/boost/flyback converters. |
| Flyback regulation mode | Enables fully isolated, optocoupler-free outputs by regulating reflected flyback pulse amplitude - ideal for medical or industrial safety-isolated supplies. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting, excellent line/load transient response, and simplified loop compensation across wide input/output ranges. |
| Adaptive antisaturation drive | Dynamically adjusts gate drive to minimize switch conduction loss across 0–2.5A load range - maintains >85% efficiency from light to full load. |
| Shutdown mode (50µA) | Supports low-power standby in battery-powered equipment; activated by pulling VC ≤ 0.15V - no external logic required. |
Applications
| Off-Line AC/DC Converter | Battery Upconverter |
|---|---|
|
Use Scenario: Converting rectified 85–265VAC to regulated 12V/2A for industrial control modules. IC Role / Device Role / Timing Role: LT1071HVCT#PBF acts as primary-side flyback controller with integrated switch, regulating output via reflected voltage on FB pin. Use Value: Eliminates optocoupler and TL431, reducing component count by ≥4 parts while maintaining ±5% output regulation across line/load/temperature. |
Use Scenario: Boosting 12V lead-acid battery to 24V for vehicle-mounted instrumentation. IC Role / Device Role / Timing Role: LT1071HVCT#PBF operates in boost topology with fixed 40kHz switching, sensing output via FB divider and controlling VSW duty cycle. Use Value: Delivers 2.5A continuous output with 6mA quiescent current - extends battery runtime >30% versus linear solutions. |
| Negative Output Power Supply | Isolated Dual-Rail Op-Amp Supply |
|
Use Scenario: Generating –15V/1A from +24V rail in test equipment requiring clean negative bias. IC Role / Device Role / Timing Role: LT1071HVCT#PBF configured in inverting topology, where VSW drives coupled inductor center-tap to produce inverted output. Use Value: Achieves –15V at 1A with <150mV peak-to-peak ripple - meets op-amp PSRR requirements without post-regulation LDOs. |
Use Scenario: Providing ±15V/500mA isolated rails for precision analog front-ends in data acquisition systems. IC Role / Device Role / Timing Role: LT1071HVCT#PBF operates in forward converter mode with dual secondary windings, using FB to regulate +15V and deriving –15V via symmetry. Use Value: Delivers matched ±15V rails with <0.5% cross-regulation error - eliminates need for separate regulators on each rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1071CT#PBF | Same architecture but 40V max input (vs. 60V); switch breakdown 65V (vs. 75V); identical pinout and FB/VC functionality. | Not suitable for 48V+ input or off-line applications; limited to automotive 24V or industrial 36V systems. | Select LT1071CT#PBF only when input never exceeds 40V and cost sensitivity outweighs HV margin. |
| LT1171HVCT#PBF | 100kHz switching (vs. 40kHz); 2.5A switch; 60V input rating; improved 3000 µmho error amp gm; different compensation behavior. | Enables smaller magnetics and faster transient response but requires re-optimization of RC compensation network and snubber design. | Choose LT1171HVCT#PBF when higher efficiency (>90%) and compact size are critical, and redesign effort is acceptable. |
Compared with LT1071CT#PBF, the LT1071HVCT#PBF adds 20V input headroom and 10V switch breakdown margin - essential for robustness in unregulated 48V or rectified AC inputs. Versus LT1171HVCT#PBF, it trades higher frequency for proven 40kHz stability in noisy industrial environments and simpler EMI filtering.
Availability
LT1071HVCT#PBF is available at Aetrix Electronics and suitable for off-line AC/DC converters, battery-powered upconverters, and isolated industrial power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1071HVCT#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 support for legacy Linear power products. Linear pioneered high-performance analog ICs with emphasis on precision, reliability, and ease-of-use.
The LT1071HVCT#PBF belongs to Linear's monolithic switching regulator family, designed specifically for rugged, high-input-voltage DC-DC conversion in industrial, telecom, and off-line applications where simplicity, integration, and fault tolerance are critical.
FAQ
What is the maximum output power achievable with LT1071HVCT#PBF?
The LT1071HVCT#PBF delivers up to 50W in practical designs - calculated from its 2.5A switch limit and typical 60V input (e.g., 2.5A × 12V = 30W in buck mode). Derating is required above 100°C junction temperature; thermal design must maintain TJ ≤ 125°C using the TO-220 tab as heatsink. Peak power depends on topology, layout, and cooling - flyback yields lower power than buck due to transformer losses.
Can LT1071HVCT#PBF replace LT1070HVCT#PBF in existing designs?
No - the LT1071HVCT#PBF is not a drop-in replacement for LT1070HVCT#PBF. While pin-compatible, it has half the switch current rating (2.5A vs. 5A) and higher on-resistance (0.3–0.5Ω vs. 0.15–0.24Ω). Substituting it into a 5A design risks thermal overload and current-limit tripping. Only use LT1071HVCT#PBF where load current stays ≤2.5A and efficiency margins accommodate higher conduction loss.
How does flyback regulation work on LT1071HVCT#PBF?
LT1071HVCT#PBF enters flyback regulation mode when the FB pin voltage drops below 0.45V (e.g., via external resistor). It then regulates the amplitude of the reflected flyback pulse - proportional to output voltage - using a dedicated 16.3V internal reference. This enables fully isolated outputs without optocouplers or extra transformer windings, with typical regulation accuracy of ±5% across line/load/temperature.
What is the purpose of the VC pin on LT1071HVCT#PBF?
The VC pin on LT1071HVCT#PBF serves four key functions: (1) error amplifier output for loop compensation, (2) current limit adjustment via external voltage clamp, (3) soft-start control using a capacitor, and (4) shutdown activation when pulled ≤0.15V. Its 0.9–2.0V normal operating range reflects load demand; driving it to 0V forces zero duty cycle, while 50µA shutdown current flows when VC is held low.
Does LT1071HVCT#PBF require external components for basic operation?
Yes - LT1071HVCT#PBF requires at minimum: an inductor, catch diode, output capacitor, input capacitor, and FB voltage-divider resistors. For stable operation, a compensation network (RC from VC to GND) is mandatory. Flyback mode adds a transformer; boost/buck require specific inductor/diode ratings. Application Note AN19 provides exact formulas and layout guidelines - omitting recommended components risks instability or thermal failure.
LT1071HVCT#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:
- 2.5A (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
LT1071HVCT#PBF FAQ
1.How can I place an order for LT1071HVCT#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1071HVCT#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 LT1071HVCT#PBF reliable?
The price and inventory of LT1071HVCT#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1071HVCT#PBF is usually 5 days.
3.What payment methods are accepted for LT1071HVCT#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1071HVCT#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1071HVCT#PBF?
LT1071HVCT#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1071HVCT#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 LT1071HVCT#PBF?
For technical support, including LT1071HVCT#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1071HVCT#PBF requirements.
6.How does Aetrix verify that LT1071HVCT#PBF is sourced from the original manufacturer or authorized distributors?
All LT1071HVCT#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 LT1071HVCT#PBF meets industry standards.
7.What is the process for return or replacement of LT1071HVCT#PBF?
All LT1071HVCT#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1071HVCT#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 LT1071HVCT#PBF part is unused and in its original packaging.
Return procedure for LT1071HVCT#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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