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Analog Devices Inc. LT1070HVCK
- Part No.:
- LT1070HVCK
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-3-4
- Datasheet:
-
LT1070HVCK.pdf
- Description:
- IC REG 5A TO3
- Quantity:
- Payment:
- Shipping:
Inventory:2,574
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Product details
Overview
LT1070HVCK from Analog Devices (formerly Linear Technology) is a monolithic high-efficiency 5A switching regulator IC with integrated 75V breakdown switch, designed for buck, boost, flyback, forward, inverting, and Cuk topologies. It operates from 3V to 60V input, delivers up to 100W output power without external switches, and features current-mode control, adaptive antisaturation drive, and flyback regulation mode for fully floating isolated outputs. It is used in off-line converters, battery upconverters, and industrial power supplies.
For engineers reviewing the LT1070HVCK datasheet, LT1070HVCK pinout, LT1070HVCK application, or LT1070HVCK equivalent, key selection criteria include its 60V max input rating, 5A internal switch current limit, 40kHz fixed switching frequency, flyback regulation capability, and TO-220-5 package compatibility with thermal design constraints in high-power DC/DC systems.
Technical Context
The LT1070HVCK implements current-mode switching control: the 40kHz oscillator initiates each cycle, and the internal 5A switch turns off when sensed current reaches the VC-pin–set threshold. Its adaptive antisaturation driver dynamically adjusts gate drive to minimize saturation losses across wide load ranges.
It integrates dual error amplifiers - one for standard regulation (1.244V reference), another for flyback mode (16.3V typical flyback reference) - with dedicated FB pin mode selection. Shutdown is activated by pulling VC below 150mV, reducing supply current to 100µA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide-range industrial, automotive, and off-line inputs without external pre-regulation. |
| Switch Current Limit | 5A typical - enables ≥100W output in buck/boost without external MOSFETs; derated at high duty cycles per datasheet curves. |
| Switch Breakdown Voltage | 75V - allows safe operation with 60V input and transient margin in flyback or boost configurations. |
| Reference Voltage | 1.244V ±20mV - precision feedback threshold enabling accurate output voltage setting with standard resistor dividers. |
| Quiescent Supply Current | 6mA typical - ensures low no-load power loss in battery-powered or standby-sensitive applications. |
| Shutdown Current | 100µA typical - enables ultra-low-power idle state for energy-efficient system-level power management. |
| Switching Frequency | 40kHz ±5kHz - balances magnetics size, EMI, and efficiency; fixed-frequency simplifies filter design and EMI compliance. |
Pinout & Package
LT1070HVCK is housed in a 5-lead plastic TO-220 (T package) with exposed tab electrically connected to VIN for thermal conduction and mechanical mounting. Pin 1 is VIN, Pin 2 is VSW, Pin 3 is GND, Pin 4 is FB, Pin 5 is VC. The tab must be insulated if mounted to a grounded heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Supplies internal LDO (2.3V rail) and switch source; connects to heatsink tab - requires isolation if heatsink is grounded. |
| VSW (Pin 2) | Switch node output | Drives external inductor/diode; swings from VIN to ~−0.5V during freewheeling; peak voltage ≤75V. |
| GND (Pin 3) | Power and signal reference | Common return for internal circuitry, error amp, and shutdown logic; not tied to VIN– in floating topologies. |
| FB (Pin 4) | Feedback input / mode select | At 1.244V → normal regulation; pulled low via resistor → activates flyback amplifier (16.3V reference). |
| VC (Pin 5) | Error amplifier output / control | Sets current limit (0.9–2.0V normal); clamped to 0V → shutdown; capacitor coupling enables soft-start. |
Key Features
| Feature | Design Value |
|---|---|
| Flyback regulation mode | Enables fully isolated, optocoupler-free outputs using transformer-coupled feedback - eliminates secondary-side sensing components. |
| Adaptive antisaturation drive | Dynamically adjusts switch gate drive to maintain low VCE(sat) across 0–5A load range - preserves efficiency without external compensation. |
| Self-protected overload handling | Internal current limiting + thermal shutdown - survives sustained short-circuit without external fusing or foldback circuitry. |
| Wide topology support | Operates in buck, boost, flyback, forward, inverting, and Cuk configurations - single IC replaces multiple controller+driver combinations. |
| Low quiescent current | 6mA at full input range - reduces no-load losses in always-on systems like telecom power shelves or industrial controllers. |
Applications
| Off-Line AC/DC Power Supply | Battery-Powered Upconverter |
|---|---|
|
Use Scenario: Converting rectified 85–265VAC (via bridge + bulk cap) to regulated 12V/5A for industrial control modules. IC Role / Device Role / Timing Role: Primary-side flyback controller with integrated 75V switch - regulates output via primary-sensed flyback pulse amplitude. Use Value: Eliminates optocoupler, TL431, and auxiliary winding - reduces BOM count by ≥4 parts and improves long-term reliability. |
Use Scenario: Boosting 12V lead-acid battery to 24V for motor drives in mobile equipment with intermittent high-current demand. IC Role / Device Role / Timing Role: High-current boost regulator operating in continuous conduction mode with 40kHz fixed frequency. Use Value: Delivers 5A output without external switch - avoids layout complexity and gate-drive losses of discrete MOSFET solutions. |
| Isolated Dual-Rail Op-Amp Supply | Industrial Programmable Logic Controller (PLC) Power |
|
Use Scenario: Generating ±15V rails from 24V DC input for precision analog signal conditioning in data acquisition systems. IC Role / Device Role / Timing Role: Inverting buck-boost controller with center-tapped transformer - provides symmetrical, tightly regulated floating outputs. Use Value: Achieves <±1% cross-regulation between rails using single IC and one transformer - no post-regulation LDOs required. |
Use Scenario: Providing 5V/3A and 24V/1A auxiliary power from 48V DC field bus in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary-side synchronous flyback controller with dual secondary windings - regulates both outputs via primary sensing. Use Value: Meets IEC 61000-4-5 surge immunity requirements with 75V switch rating - withstands 48V bus transients up to ±1kV. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1074HVCT | 100kHz switching frequency, 40V max input (60V HV version), 5A switch - higher frequency enables smaller magnetics but lower voltage margin. | Preferred for space-constrained designs needing faster transient response; unsuitable for >60V input or flyback isolation without external sensing. | Select LT1074HVCT only when board area is critical and input stays ≤60V; verify flyback stability with external compensation. |
| LT1370CN8#PBF | 500kHz frequency, 35V max input, 6A switch - higher frequency and current, but lower input voltage rating and no native flyback mode. | Used in compact 12V–24V systems requiring high power density; requires optocoupler-based feedback for isolation. | Choose LT1370CN8#PBF for high-frequency, high-current non-isolated apps; avoid where 60V input or transformerless isolation is needed. |
Compared with LT1074HVCT and LT1370CN8#PBF, the LT1070HVCK uniquely combines 60V input tolerance, integrated flyback regulation, and 40kHz operation - making it optimal for rugged, isolated, medium-frequency industrial power where reliability trumps miniaturization.
Availability
LT1070HVCK is available at Aetrix Electronics and suitable for off-line AC/DC power supplies, battery upconverters, and industrial programmable logic controller (PLC) power systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1070HVCK 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, robustness, and ease-of-use in power management.
The LT1070HVCK belongs to Linear's monolithic high-power switching regulator family, designed specifically for industrial, telecom, and off-line applications demanding wide input range, intrinsic protection, and topology flexibility without external drivers or controllers.
FAQ
What is the maximum input voltage rating for the LT1070HVCK?
The LT1070HVCK has an absolute maximum supply voltage of 60V and a switch breakdown voltage of 75V. This allows reliable operation with 60V DC inputs while maintaining margin against transients - critical in off-line and industrial bus applications. Exceeding 60V risks permanent damage per Absolute Maximum Ratings.
Does the LT1070HVCK support isolated flyback topologies without an optocoupler?
Yes, the LT1070HVCK supports optocoupler-free flyback regulation via its dedicated flyback amplifier mode. When the FB pin is pulled low, the IC regulates the flyback pulse amplitude referenced to VIN, enabling fully floating outputs - confirmed in datasheet Figure TA08 and Electrical Characteristics table (VFB = 16.3V typical).
What is the thermal resistance (θJA) of the LT1070HVCK in its TO-220 package?
The LT1070HVCK in the T package (TO-220-5) has a junction-to-ambient thermal resistance (θJA) of 75°C/W under standard JEDEC 2S2P board conditions. With proper heatsinking to the VIN-connected tab, θJC is 2°C/W - enabling 100W operation at TJ ≤ 100°C per datasheet Package Information section.
Can the LT1070HVCK be synchronized to an external clock?
No - the LT1070HVCK uses a fixed 40kHz internal oscillator and does not support external synchronization. The datasheet states "Can be Externally Synchronized (Consult Factory)" only for custom versions; the standard LT1070HVCK has no sync pin or documented sync capability.
How does the LT1070HVCK implement current limiting during overload?
The LT1070HVCK uses pulse-by-pulse current limiting: the internal sense resistor (0.02Ω) monitors switch current, and the comparator disables the switch when current exceeds the VC-pin–determined threshold. This provides immediate protection during short circuits - verified in Block Diagram and Electrical Characteristics (ILIM = 5A typical).
LT1070HVCK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- TO-3-4
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-3
LT1070HVCK FAQ
1.How can I place an order for LT1070HVCK through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1070HVCK 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 LT1070HVCK reliable?
The price and inventory of LT1070HVCK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1070HVCK is usually 5 days.
3.What payment methods are accepted for LT1070HVCK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1070HVCK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1070HVCK?
LT1070HVCK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1070HVCK 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 LT1070HVCK?
For technical support, including LT1070HVCK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1070HVCK requirements.
6.How does Aetrix verify that LT1070HVCK is sourced from the original manufacturer or authorized distributors?
All LT1070HVCK 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 LT1070HVCK meets industry standards.
7.What is the process for return or replacement of LT1070HVCK?
All LT1070HVCK units undergo pre-shipment inspection (PSI). If there is an issue with LT1070HVCK, 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 LT1070HVCK part is unused and in its original packaging.
Return procedure for LT1070HVCK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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