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Analog Devices Inc. LT1076CT-5#PBF
- Part No.:
- LT1076CT-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-5
- Datasheet:
-
LT1076CT-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 2A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,551
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Product details
Overview
LT1076CT-5 from Analog Devices (formerly Linear Technology) is a monolithic 5V fixed-output buck switching regulator with an integrated 2A bipolar power switch, 100kHz switching frequency, ±2% output voltage tolerance over temperature, and 8V–60V input range. It operates in classic buck, positive-to-negative, and tapped-inductor configurations for industrial power conversion.
For engineers reviewing the LT1076CT-5 datasheet, LT1076CT-5 pinout, LT1076CT-5 application, or LT1076CT-5 equivalent, key selection criteria include its 2A on-chip switch, true analog multiplier feedback for fast line transient response, 9.5mA quiescent current, and TO-220-5 package thermal performance (θJA = 50°C/W).
Technical Context
The LT1076CT-5 implements a classic buck topology with design extensions enabling positive-to-negative and tapped-inductor operation. Its switch output swings 40V below ground, supporting 4A output in tapped-buck mode. The internal analog multiplier in the feedback loop ensures input-voltage-independent loop gain and near-instantaneous response to VIN transients.
Pulse-by-pulse current limiting protects against short circuits and overloads. A self-boot feature enables startup at as low as 5V input in inverting/boost modes, while minimum operating supply voltage is 7.3V in normal buck regulation. Shutdown threshold is 2.2V–2.7V on SHDN pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% over full temperature and load range - eliminates external resistor divider and ensures stable rail for logic or analog circuitry. |
| Switch Current Limit | 2.6A typical (ILIM open) - sets maximum safe inductor peak current and defines short-circuit robustness. |
| Switching Frequency | 100kHz nominal (90–110kHz over temp) - balances EMI, efficiency, and external component size for industrial SMPS designs. |
| Input Voltage Range | 8V–60V for buck operation; down to 5V in inverting/boost via self-boot - supports wide-input industrial and automotive battery-supplied systems. |
| Quiescent Current | 9.5mA max - enables low-noise, high-efficiency operation without standby-mode complexity. |
| Thermal Resistance | θJA = 50°C/W (TO-220-5) - requires minimal heatsinking for 2A continuous output at ambient ≤60°C. |
| Sense Pin Voltage | 5V ±150mV reference - directly regulates output via resistive divider; no external error amplifier needed. |
Pinout & Package
LT1076CT-5 is housed in a 5-lead plastic TO-220 package (T5) with tab connected to GND. The package provides low thermal resistance (θJC = 4°C/W) and mechanical robustness for board-mounted power conversion.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 8V–60V DC input; must be ≥8V after startup for regulation; decoupling capacitor required. |
| VSW | Switch Output Terminal | Drives external inductor; swings up to 40V below GND - enables negative output and tapped-inductor topologies. |
| GND | Power and Signal Ground | Common return for VIN, VSW, SENSE, VC; tab is electrically connected to this pin for thermal conduction. |
| SENSE | Feedback Input | Monitors regulated output via resistor divider; 5V reference enables precise 5V regulation without trimming. |
| VC | Control Amplifier Output | Drives external compensation network; internal error amp output used for loop stability tuning. |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage-dependent loop gain variation, delivering consistent dynamic response across 8–60V input range. |
| Pulse-by-pulse current limiting | Prevents switch destruction during output shorts or overload - no external current-sense resistor required. |
| Multi-topology support | Operates as buck, positive-to-negative, and tapped-inductor converter using same IC - reduces BOM count across power architectures. |
| Self-boot capability | Starts regulation from 5V input in inverting/boost modes - extends usability beyond standard buck VIN minimum. |
| Low quiescent current | 9.5mA enables efficient operation in always-on industrial controllers without auxiliary LDO dependency. |
Applications
| Industrial 5V Rail Generation | Tapped-Inductor 4A Buck Converter |
|---|---|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and microcontroller peripherals from unregulated 24VDC industrial bus. IC Role / Device Role / Timing Role: Primary 5V step-down regulator with integrated switch and analog feedback control loop. Use Value: Delivers stable 5V at up to 2A with ±2% tolerance and <0.02%/V line regulation - meets tight logic rail requirements without post-regulation LDO. | Use Scenario: High-current 5V supply for FPGA core or DSP subsystem requiring >2A with minimal external components. IC Role / Device Role / Timing Role: Tapped-inductor buck controller leveraging VSW swing capability to double effective output current. Use Value: Achieves 4A output at 5V using single LT1076CT-5 and tapped inductor - avoids paralleling switches or adding secondary regulators. |
| Positive-to-Negative Converter | Wide-Input Battery-Powered System |
Use Scenario: Generating –5V rail for op-amp biasing or RS-232 interface in equipment with only +24V available. IC Role / Device Role / Timing Role: Inverting switching regulator using LT1076CT-5 in flyback-like configuration with grounded output. Use Value: Produces regulated –5V from +24V input with no additional ICs - replaces discrete inverter + LDO solution. | Use Scenario: Power management in portable test equipment powered by 12–48V lead-acid or LiFePO₄ battery packs. IC Role / Device Role / Timing Role: Primary buck regulator handling wide VIN range and cold-cranking dips down to 5V via self-boot. Use Value: Maintains 5V output during battery sag to 8V (or 5V in inverting mode), ensuring uninterrupted MCU operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1074CT#PBF | 4.4A switch current limit, same 100kHz frequency and TO-220-5 package, but adjustable output (requires external divider). | Used where higher output current (>2A) or non-5V outputs (e.g., 3.3V, 12V) are required. | Select LT1074CT#PBF when >2A continuous output or programmable VOUT is needed; LT1076CT-5 remains optimal for fixed 5V simplicity. |
| LT3430EDD#PBF | 2.75A switch, 200kHz frequency, 60V max input, TSSOP-16E package, lower 2.5mA quiescent current. | Preferred for space-constrained PCBs and higher-frequency designs requiring smaller magnetics. | Choose LT3430EDD#PBF for compact layouts and faster transient response; LT1076CT-5 offers superior thermal performance in TO-220 and simpler 5V-only implementation. |
Compared with LT1074CT#PBF and LT3430EDD#PBF, the LT1076CT-5 delivers optimized trade-offs for fixed 5V industrial supplies: lowest component count (no feedback resistors), best thermal dissipation in TO-220, and proven ruggedness in harsh environments - without sacrificing 2A capability or 100kHz switching efficiency.
Availability
LT1076CT-5 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded power conversion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1076CT-5 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 its legacy power management portfolio with full technical and manufacturing continuity.
The LT1076 series was designed specifically for rugged, low-component-count DC/DC conversion in industrial and instrumentation applications - emphasizing reliability, multi-topology flexibility, and integrated protection.
FAQ
What is the maximum output current achievable with the LT1076CT-5 in standard buck configuration?
The LT1076CT-5 supports up to 2A continuous output current in standard buck mode, limited by its internal 2.6A typical current limit and thermal design of the TO-220-5 package. At 2A, proper heatsinking is required to maintain junction temperature within 125°C under worst-case ambient conditions. Derating applies above 60°C ambient.
Does the LT1076CT-5 require external compensation components?
Yes, the LT1076CT-5 requires external compensation components connected to the VC pin to stabilize the control loop. A typical network includes a series RC from VC to GND and a capacitor from VC to SENSE. Compensation values depend on inductor value, output capacitance, and desired phase margin - Application Note 44 provides design guidelines specific to the LT1076CT-5.
Can the LT1076CT-5 operate with an input voltage lower than 8V?
Yes - the LT1076CT-5 can start up and regulate from as low as 5V input in positive-to-negative or boost configurations due to its self-boot feature. However, in standard buck mode, minimum input voltage after startup is 8V (7.3V typical); operation below this level results in loss of regulation and possible dropout.
What is the function of the VSW pin on the LT1076CT-5, and why is its negative swing capability important?
The VSW pin is the collector of the internal bipolar power switch. Its ability to swing 40V below ground enables three key topologies: classic buck (VSW to inductor), positive-to-negative (VSW to grounded output capacitor), and tapped-inductor buck (VSW drives center-tapped inductor). This eliminates need for external high-side drivers or isolated gate supplies in those configurations.
Is the LT1076CT-5 pin-compatible with other variants like LT1076CT7-5 or LT1076HVCT-5?
No - the LT1076CT-5 (5-lead TO-220) is not pin-compatible with LT1076CT7-5 (7-lead TO-220) or LT1076HVCT-5 (high-voltage 60V-rated version). The 7-lead variant adds SHDN and ILIM pins, changing pinout and functionality. Substituting requires PCB layout changes and review of absolute maximum ratings, especially switch voltage limits.
LT1076CT-5#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, Flyback
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
LT1076CT-5#PBF FAQ
1.How can I place an order for LT1076CT-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076CT-5#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 LT1076CT-5#PBF reliable?
The price and inventory of LT1076CT-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1076CT-5#PBF is usually 5 days.
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Once your LT1076CT-5#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 LT1076CT-5#PBF?
For technical support, including LT1076CT-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076CT-5#PBF requirements.
6.How does Aetrix verify that LT1076CT-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1076CT-5#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 LT1076CT-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1076CT-5#PBF?
All LT1076CT-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076CT-5#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 LT1076CT-5#PBF part is unused and in its original packaging.
Return procedure for LT1076CT-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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