My Inquiry
My Account
Analog Devices Inc. LT1071HVCK
- Part No.:
- LT1071HVCK
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-3-4
- Datasheet:
-
LT1071HVCK.pdf
- Description:
- IC REG 2.5A TO3
- Quantity:
- Payment:
- Shipping:
Inventory:2,882
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1071HVCK from Analog Devices (formerly Linear Technology) is a monolithic high-voltage current-mode switching regulator IC with integrated 2.5A switch, 3V–60V input range, 40kHz fixed-frequency oscillator, and flyback regulation mode for isolated outputs. It operates in buck, boost, flyback, forward, inverting, and Cuk topologies and delivers up to 50W output power in LT1071HV variants. Used in off-line converters, battery upconverters, and industrial power supplies requiring wide-input, floating-output capability.
For engineers reviewing the LT1071HVCK datasheet, LT1071HVCK pinout, LT1071HVCK application, or LT1071HVCK equivalent, key selection criteria include its 60V max input rating, 2.5A internal switch current limit, TO-220-5 package thermal performance, flyback regulation threshold at 0.45V on FB pin, and shutdown current of 50µA - all critical for ruggedized DC-DC design under variable line conditions.
Technical Context
The LT1071HVCK implements current-mode control: switch duty cycle is directly set by sensed switch current rather than output voltage feedback, enabling fast line transient response and inherent pulse-by-pulse overcurrent protection. Its adaptive antisaturation driver minimizes switch saturation loss across load current extremes.
It integrates a 1.24V bandgap reference, error amplifier (gm = 4400 µmho typ), flyback amplifier, 40kHz oscillator, logic/driver, and 75V-rated 2.5A NPN switch. The VC pin serves quadruple function: compensation node, current limit adjust, soft-start interface, and shutdown control (≤0.15V triggers 50µA standby mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 60V - supports wide industrial, automotive, and off-line inputs without external pre-regulation. |
| Switch Current Limit | 2.5A (min) at TJ ≥ 25°C - defines maximum continuous output current in buck/boost; derates with duty cycle and temperature. |
| Reference Voltage (FB) | 1.244V (typ) - sets output voltage via resistive divider; ±1.6% initial accuracy enables <±2% output regulation. |
| Quiescent Supply Current | 6mA (typ) - enables high efficiency at light loads; low bias current reduces no-load power loss. |
| Shutdown Supply Current | 50µA (typ) - allows ultra-low-power standby in battery-backed or energy-sensitive systems. |
| Switch Breakdown Voltage | 75V - ensures safe operation with 60V input plus surge margin in flyback or boost configurations. |
| Operating Frequency | 40kHz (typ) - fixed frequency simplifies EMI filtering; stable across temperature and supply variations. |
Pinout & Package
LT1071HVCK is housed in a 5-lead plastic TO-220 (T-package) with exposed tab electrically connected to VIN. Thermal resistance θJA = 75°C/W (free air), θJC = 4°C/W. Mounting requires insulated hardware due to VIN-connected tab.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power Input | Main supply input (3–60V); connects to exposed tab - must be isolated from heatsink unless heatsink is referenced to VIN. |
| VSW | Switch Collector | High-side NPN collector output; drives external inductor/diode network; swings up to 75V. |
| GND | Ground Reference | Analog and power ground return; separate from VIN - critical for noise immunity in current-sense path. |
| FB | Feedback Input | Senses output voltage divider; 0.45V threshold enables flyback regulation mode when pulled low. |
| VC | Error Amplifier Output / Control | Current-source output (200µA typ); used for compensation, current limit clamp, soft-start, and shutdown control. |
Key Features
| Feature | Design Value |
|---|---|
| Flyback Regulation Mode | Enables fully floating, optocoupler-free isolated outputs by regulating flyback pulse amplitude - eliminates secondary-side sensing complexity. |
| Adaptive Antisaturation Drive | Dynamically adjusts base drive to minimize switch saturation voltage across 0–2.5A load range - maintains high efficiency at both light and heavy loads. |
| Self-Protected Overload Handling | Internal current limiting + thermal shutdown prevent damage during short-circuit or overload - no external foldback circuitry required. |
| Wide Topology Support | Operates in buck, boost, flyback, forward, inverting, and Cuk configurations - one IC covers most non-isolated and isolated DC-DC needs. |
| Low Shutdown Current | 50µA typical supply draw in shutdown - suitable for battery-powered systems requiring long standby life. |
Applications
| Industrial Off-Line Power Supply | Battery-Powered Upconverter |
|---|---|
|
Use Scenario: 24V AC/DC adapter powering PLC I/O modules from 85–265VAC via bridge rectifier and bulk cap. IC Role / Device Role / Timing Role: Primary-side controller in discontinuous conduction flyback topology; regulates isolated 24V/1A output using primary-side sensing. Use Value: Eliminates optocoupler and TL431, reducing BOM count and improving reliability while maintaining ±3% output tolerance across line/load. |
Use Scenario: 12V lead-acid battery powering 24V solenoid actuators in agricultural machinery. IC Role / Device Role / Timing Role: Boost converter controller driving external MOSFET and Schottky diode; operates at 40kHz with peak-current mode control. Use Value: Delivers 2.5A continuous output with >90% efficiency at 10A peak; internal 75V switch withstands battery transients up to 60V. |
| Isolated Dual-Rail Op-Amp Supply | Ruggedized Telecom DC-DC Module |
|
Use Scenario: Generating ±15V rails from 48V telecom bus for precision instrumentation amplifiers. IC Role / Device Role / Timing Role: Flyback controller with center-tapped secondary; FB pin configured for dual-rail regulation via single winding. Use Value: Achieves cross-regulation better than ±5% between rails without post-regulation; flyback blanking time rejects transformer leakage spikes. |
Use Scenario: 48V-to-3.3V/5V intermediate bus converter in outdoor base station equipment operating –40°C to +85°C. IC Role / Device Role / Timing Role: Synchronous buck controller (external FETs) using LT1071HVCK's VC pin for current-mode loop control and fault limiting. Use Value: Withstands 100V surge transients per IEC 61000-4-5; 60V rating and 150°C junction rating ensure operation during brownouts and thermal stress. |
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 |
|---|---|---|---|
| LT3751IMSE | Higher 75V input rating, 100kHz switching, external MOSFET drive - no integrated switch. | Requires external high-side switch; suited for >5A designs where thermal management favors discrete FETs. | Choose LT3751IMSE when output current exceeds 2.5A or higher frequency (100kHz) is needed for smaller magnetics. |
| LM5009AMM/NOPB | 50V max input, 1A integrated switch, 1MHz fixed frequency, smaller TSOT-23-8 package. | Limited to lower power (<15W); lacks flyback regulation mode and wide-temp industrial grade screening. | Choose LM5009AMM/NOPB for space-constrained, cost-sensitive consumer applications below 1A output. |
Compared with LT3751IMSE and LM5009AMM/NOPB, the LT1071HVCK uniquely balances integrated 2.5A switch capability, 60V input resilience, flyback isolation support, and industrial temperature range - making it optimal for mid-power, ruggedized, multi-topology designs where BOM simplicity and reliability are prioritized over ultra-high frequency or ultra-low cost.
Availability
LT1071HVCK is available at Aetrix Electronics and suitable for industrial power supplies, battery energy systems, and telecom infrastructure requiring stable component supply, long lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1071HVCK 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, datasheets, and application notes for legacy Linear parts including the LT1071HVCK.
The LT1071HVCK belongs to Linear's high-voltage monolithic switching regulator family, designed specifically for robust, topology-flexible DC-DC conversion in harsh environments - emphasizing integration, fault tolerance, and ease of use over minimal footprint.
FAQ
What is the maximum input voltage rating for the LT1071HVCK?
The LT1071HVCK has an absolute maximum supply voltage of 60V, with guaranteed operation across 3V to 60V input range. Its internal switch breakdown voltage is rated at 75V, providing 15V margin for transient suppression - essential for off-line and industrial applications where input surges occur.
Does the LT1071HVCK support isolated flyback topologies without optocouplers?
Yes, the LT1071HVCK supports flyback regulation mode: pulling the FB pin below 0.45V disconnects the main error amplifier and engages the flyback amplifier, enabling regulation of output voltage via primary-side flyback pulse amplitude - eliminating need for optocouplers or secondary-side references.
What is the thermal performance of the LT1071HVCK in TO-220 package?
The LT1071HVCK in T-package (TO-220-5) has θJA = 75°C/W (free air) and θJC = 4°C/W. The exposed tab is connected to VIN, so heatsinking requires electrical isolation unless the heatsink is referenced to VIN - critical for safe thermal design in high-power applications.
How does the LT1071HVCK implement current-mode control?
The LT1071HVCK uses true current-mode architecture: the switch turns off when sensed current reaches a level set by the VC pin voltage. This provides inherent cycle-by-cycle current limiting, excellent line regulation, and simplified loop compensation - unlike voltage-mode controllers that require additional slope compensation.
Can the LT1071HVCK be synchronized to an external clock?
No - the LT1071HVCK features a fixed 40kHz internal oscillator with no external synchronization input. The datasheet states "Can be Externally Synchronized (Consult Factory)", but this capability applies only to custom mask versions; standard LT1071HVCK lacks SYNC pin or frequency adjustment interface.
LT1071HVCK 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
LT1071HVCK FAQ
1.How can I place an order for LT1071HVCK through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1071HVCK 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 LT1071HVCK reliable?
The price and inventory of LT1071HVCK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1071HVCK is usually 5 days.
3.What payment methods are accepted for LT1071HVCK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1071HVCK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1071HVCK?
LT1071HVCK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1071HVCK 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 LT1071HVCK?
For technical support, including LT1071HVCK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1071HVCK requirements.
6.How does Aetrix verify that LT1071HVCK is sourced from the original manufacturer or authorized distributors?
All LT1071HVCK 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 LT1071HVCK meets industry standards.
7.What is the process for return or replacement of LT1071HVCK?
All LT1071HVCK units undergo pre-shipment inspection (PSI). If there is an issue with LT1071HVCK, 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 LT1071HVCK part is unused and in its original packaging.
Return procedure for LT1071HVCK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1071HVCK Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
