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Analog Devices Inc. LT1082IT#30PBF
- Part No.:
- LT1082IT#30PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5 Formed Leads
- Datasheet:
-
LT1082IT#30PBF.pdf
- Description:
- IC REG BCK BST ADJ 850MA TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
LT1082IT#30PBF from Analog Devices (formerly Linear Technology) is a monolithic high-voltage current-mode switching regulator IC with an integrated 1A, 100V breakdown switch. It operates from 3V to 75V input, delivers up to 20W without external power devices, and features 4.5mA quiescent current, 60kHz switching frequency, and isolated flyback regulation mode-enabling fully floating outputs in telecom 5V supplies from –48V inputs.
For engineers reviewing the LT1082IT#30PBF datasheet, LT1082IT#30PBF pinout, LT1082IT#30PBF application, or LT1082IT#30PBF equivalent, key selection considerations include its 100V switch rating, internal current-limit protection, shutdown mode (120µA), flyback reference voltage programmability, and compatibility with TO-220 thermal management for industrial DC-DC conversion.
Technical Context
The LT1082IT#30PBF 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 simplified loop compensation. Its internal oscillator runs at 60kHz (shiftable to 12kHz under short-circuit via FB pin current ≥350µA), and it integrates a 1.24V bandgap reference, error amplifier (gm = 3000–6000 µmho), and adaptive anti-saturation driver.
It supports multiple topologies (buck, boost, flyback, forward, inverting) and includes dual-mode operation: normal regulation via FB pin (1.24V reference) and isolated flyback regulation (16–21.5V programmable reference) using transformer-coupled feedback without optocouplers. The VC pin serves as error amplifier output, current limit adjust, soft-start node, and shutdown control (≤0.15V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 75V - enables direct operation from wide-range industrial or telecom supplies (e.g., –48V to +75V rails) |
| Switch Breakdown Voltage | 100V - supports high-voltage flyback and boost designs without external MOSFETs |
| Switch Current Limit | 1.07A typical (LT1082I grade) - sets maximum deliverable power and overload protection threshold |
| Quiescent Supply Current | 4.5mA - minimizes no-load power loss in battery-backed or standby systems |
| Shutdown Current | 120µA - enables ultra-low-power standby for energy-sensitive applications |
| Reference Voltage | 1.244V ±20mV - precision feedback threshold for stable output regulation across temperature |
| Flyback Reference Range | 16–21.5V (adjustable via RFB) - allows isolated output regulation without optocoupler or extra winding |
Pinout & Package
LT1082IT#30PBF is supplied in a 5-lead TO-220 package (T package), with leads electrically and thermally optimized for high-power DC-DC conversion. The case is internally connected to GND, and the tab provides low-thermal-resistance path to heatsink (θJA = 75°C/W, θJC = 8°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 3V–75V unregulated input; powers internal LDO and logic |
| VSW | Switch Collector Output | High-side switch output node; connects to inductor/transformer primary |
| GND | Power & Signal Ground | Common return for internal circuitry, switch emitter, and thermal tab |
| FB | Feedback Input / Mode Select | Senses output voltage (1.24V ref) or programs flyback mode (60–200µA current) |
| VC | Error Amplifier Output / Control | Provides gm-amplifier output; used for compensation, current limit clamp, soft-start, and shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Current-Mode Control Architecture | Enables immediate line transient response and inherent pulse-by-pulse overcurrent protection |
| Isolated Flyback Regulation Mode | Generates fully floating, optocoupler-free outputs by regulating flyback pulse amplitude |
| Frequency Shift-Down Protection | Automatically reduces switching frequency from 60kHz to 12kHz when FB pin sinks ≥350µA - prevents minimum-on-time violation during short-circuit |
| External Synchronization Capability | Accepts 75–90kHz sync signal via VC pin for EMI reduction in multi-regulator systems |
| Thermal Shutdown (Not Tested) | Internal junction protection activates under sustained overload - complements external thermal design |
Applications
| Telecom Negative-to-Positive 5V Supply | Industrial High-Voltage Boost Converter |
|---|---|
Use Scenario: Generating regulated +5V/0.7A from –48V telecom battery bus with full isolation and no optocoupler. IC Role / Device Role / Timing Role: Primary-side controller implementing flyback topology with internal 100V switch and programmable flyback reference. Use Value: Eliminates optocoupler and secondary-side feedback components while maintaining tight regulation across –20V to –70V input range. | Use Scenario: Stepping 15V input up to 90V/120mA for industrial sensor biasing or analog front-end supplies. IC Role / Device Role / Timing Role: High-efficiency boost controller operating at 60kHz with internal 1A switch and low 4.5mA quiescent current. Use Value: Reduces BOM count and layout area vs. discrete switch solutions; maintains >75% efficiency across load range. |
| Isolated Dual-Output Flyback Supply | High-Input-Voltage Buck Regulator |
Use Scenario: Providing ±15V/0.3A isolated outputs from 30–70V industrial input with minimum load requirements met. IC Role / Device Role / Timing Role: Flyback controller regulating both outputs via single primary winding and auxiliary feedback winding. Use Value: Achieves dual-rail isolation with <1% cross-regulation drift and no secondary-side regulation ICs. | Use Scenario: Converting 48V or 60V factory automation rail to 5V/1A for embedded microcontrollers. IC Role / Device Role / Timing Role: Synchronous-capable buck controller with 100V switch rating and current-mode stability margin. Use Value: Supports direct 48V–60V input without pre-regulator stage, reducing system complexity and component count. |
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 |
|---|---|---|---|
| LT1072HV | Lower switch voltage (75V), higher switch current (1.25A), 40kHz frequency, different flyback reference (16V fixed) | Optimized for lower-input-voltage flyback; lacks LT1082's 100V rating and frequency shift-down protection | Select LT1072HV only if input ≤60V and flyback reference flexibility is not required |
| LTC3891 | 40V max VIN, 105V VDS external MOSFET support, 150kHz–900kHz sync, no integrated switch | Requires external high-voltage FETs; offers higher frequency and digital interface but adds complexity | Choose LTC3891 for designs needing >100kHz operation or PMBus monitoring, accepting added BOM and layout effort |
Compared with LT1072HV and LTC3891, LT1082IT#30PBF uniquely combines 100V integrated switching, flyback mode programmability, and automatic short-circuit frequency reduction - making it optimal for cost-sensitive, isolated telecom and industrial supplies where simplicity and robustness are prioritized over programmability or ultra-high frequency.
Availability
LT1082IT#30PBF is available at Aetrix Electronics and suitable for telecom power systems, industrial DC-DC converters, and isolated instrumentation supplies requiring stable component supply, extended temperature operation (–40°C to +125°C), and long-term lifecycle continuity.
Supply support for LT1082IT#30PBF 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 supply chain support for legacy Linear products including the LT1082 family.
The LT1082 product line was designed for high-reliability, high-voltage DC-DC conversion in telecom infrastructure and industrial equipment - emphasizing integration, fault resilience, and topology flexibility without external switches.
FAQ
What is the maximum input voltage rating for the LT1082IT#30PBF?
The LT1082IT#30PBF has an absolute maximum supply voltage of 75V and a switch breakdown voltage rated at 100V. This allows safe operation with input rails up to 75V while supporting transformer or inductor flyback voltages up to 100V. Exceeding 75V on VIN may damage internal circuitry, even if VSW remains below 100V.
Does the LT1082IT#30PBF support isolated flyback regulation without an optocoupler?
Yes, the LT1082IT#30PBF supports isolated flyback regulation without an optocoupler via its dedicated flyback mode. When the FB pin sinks 60–200µA, the device switches to flyback regulation using a programmable 16–21.5V reference tied to the flyback pulse amplitude - enabling fully floating outputs with transformer-coupled feedback only.
What is the purpose of the VC pin on the LT1082IT#30PBF?
The VC pin on the LT1082IT#30PBF serves four critical functions: (1) error amplifier output for compensation network connection, (2) current limit adjustment via external clamp voltage, (3) soft-start initiation using capacitor coupling, and (4) shutdown activation when pulled ≤0.15V (reducing supply current to 120µA). Its gm-amplifier output drives external compensation and control circuits.
How does the LT1082IT#30PBF protect against output short-circuits?
The LT1082IT#30PBF protects against output short-circuits using frequency shift-down: when FB pin current reaches ≈350µA, switching frequency drops from 60kHz to 12kHz. This avoids violating the internal blanking time under heavy overload, maintaining control loop stability. Combined with pulse-by-pulse current limiting (1.07A typical), this provides robust short-circuit immunity in telecom and industrial supplies.
What thermal considerations apply to the LT1082IT#30PBF in TO-220 package?
The LT1082IT#30PBF in TO-220 (T package) has θJA = 75°C/W and θJC = 8°C/W. With typical dissipation of ~0.43W in a –45V-to-+5V/0.5A telecom converter, junction rise is ~32°C above ambient. For continuous 1A loads or high ambient temperatures, a heatsink is recommended to maintain TJ ≤125°C - especially given its rated operating range of –40°C to +125°C.
LT1082IT#30PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-5 Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive or Negative, Isolation Capable
- Topology:
- Buck, Boost, Flyback, Forward Converter
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 75V
- Voltage - Output (Min/Fixed):
- 1.244V
- Voltage - Output (Max):
- 100V (Switch)
- Current - Output:
- 850mA (Switch)
- Frequency - Switching:
- 12kHz ~ 60kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5 Flow 30
LT1082IT#30PBF FAQ
1.How can I place an order for LT1082IT#30PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1082IT#30PBF 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 LT1082IT#30PBF reliable?
The price and inventory of LT1082IT#30PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1082IT#30PBF is usually 5 days.
3.What payment methods are accepted for LT1082IT#30PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1082IT#30PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1082IT#30PBF?
LT1082IT#30PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1082IT#30PBF 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 LT1082IT#30PBF?
For technical support, including LT1082IT#30PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1082IT#30PBF requirements.
6.How does Aetrix verify that LT1082IT#30PBF is sourced from the original manufacturer or authorized distributors?
All LT1082IT#30PBF 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 LT1082IT#30PBF meets industry standards.
7.What is the process for return or replacement of LT1082IT#30PBF?
All LT1082IT#30PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1082IT#30PBF, 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 LT1082IT#30PBF part is unused and in its original packaging.
Return procedure for LT1082IT#30PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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