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Analog Devices Inc. LT1076CQ-5#PBF
- Part No.:
- LT1076CQ-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1076CQ-5#PBF.pdf
- Description:
- IC REG BUCK BOOST 5V 2A DDPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:109
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Product details
Overview
LT1076CQ-5 from Analog Devices (formerly Linear Technology) is a monolithic 2A fixed 5V buck switching regulator with integrated bipolar power switch, oscillator, current limit, and output monitor. It operates from 8V–60V input, delivers ±2% output voltage tolerance over temperature, and supports tapped-inductor configurations for up to 4A output. Used in industrial power supplies requiring compact, robust DC/DC conversion.
For engineers reviewing the LT1076CQ-5 datasheet, LT1076CQ-5 pinout, LT1076CQ-5 application, or LT1076CQ-5 equivalent, key selection criteria include its 100kHz fixed switching frequency, true analog multiplier feedback loop, on-chip pulse-by-pulse current limiting, and compatibility with buck, positive-to-negative, and flyback topologies.
Technical Context
The LT1076CQ-5 implements a classic positive buck topology enhanced by a true analog multiplier in the feedback path-ensuring near-instantaneous response to input voltage transients and input-voltage-independent loop gain. Its switch output swings 40V below ground, enabling tapped-inductor operation and negative-output configurations.
It features internal 2.6A current limiting (with external resistor adjustment), self-boot capability down to 5V input in inverting/boost modes, and shutdown control via SHDN pin (threshold 2.2V–2.7V). Thermal resistance is θJC = 4°C/W, θJA = 30°C/W in the Q package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% over full temperature and load range-enables stable logic supply without external feedback resistors. |
| Switch Current Limit | 2.6A typical (ILIM open)-provides robust short-circuit protection with pulse-by-pulse limiting. |
| Switching Frequency | 100kHz nominal-balances efficiency, EMI, and external component size for industrial-grade designs. |
| Input Voltage Range | 8V–60V for buck mode; as low as 5V in inverting/boost with self-boot-supports wide-input industrial and automotive battery systems. |
| Quiescent Current | 9.5mA typical-minimizes no-load power loss in always-on systems. |
| Switch "On" Voltage | 1.2V at 0.5A, 1.7V at 2A-defines conduction loss and thermal budget in high-current buck stages. |
| Operating Temperature | 0°C to 70°C ambient-suitable for commercial and industrial environments without extended temperature grading. |
Pinout & Package
LT1076CQ-5 is housed in a 5-lead plastic DD Pak (Q package) with exposed copper heat sink on bottom. The package provides low thermal resistance (θJC = 4°C/W) and is designed for surface-mount soldering with standard pad layout per LTC DWG #05-08-1461.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply | Accepts 8V–60V DC input; must be ≥8V after startup for regulation (≥5V at TA < 25°C). |
| VSW | Switch collector output | Drives external inductor; rated to swing 40V below ground-enables negative-output and flyback topologies. |
| GND | Power and signal ground | Common reference for all circuitry; tab is electrically connected to GND for thermal conduction. |
| VC | Control voltage output | Internal error amplifier output; drives external compensation network; clamps at 1.5V during 0% duty cycle. |
| FB/SENSE | Feedback and sense input | Monitors output voltage via internal 5V reference; accepts –2V to 10V input-supports remote sensing and custom divider networks. |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage-dependent loop gain-ensures consistent transient response across 8V–60V input range. |
| Integrated 2A bipolar power switch | Reduces BOM count and PCB area; eliminates need for external MOSFET driver and discrete switch. |
| Pulse-by-pulse current limiting | Prevents thermal runaway during output shorts or overload-no external current-sense resistor required. |
| Tapped-inductor support | Enables 4A output at 5V in buck mode using center-tapped inductor-doubles current capability without increasing switch stress. |
| Multi-topology flexibility | Supports buck, positive-to-negative, boost, and flyback configurations with minimal external component changes. |
Applications
| Industrial Power Supply | Automotive Battery Converter |
|---|---|
Use Scenario: Converting 24V truck battery to regulated 5V for engine control unit peripherals. IC Role / Device Role / Timing Role: Primary step-down regulator with integrated switch and current limiting. Use Value: Operates down to 5V input in self-boot mode during cranking; withstands 60V load-dump transients. | Use Scenario: Generating isolated –5V rail from 12V battery for sensor biasing in ADAS modules. IC Role / Device Role / Timing Role: Positive-to-negative converter using flyback topology. Use Value: VSW swing to –40V enables efficient inverting operation without external level-shifting circuitry. |
| Programmable Logic Controller (PLC) | Test Equipment Power Module |
Use Scenario: Providing clean 5V for FPGA I/O banks and microcontroller cores in modular PLC backplanes. IC Role / Device Role / Timing Role: Fixed-output buck regulator with low-noise output and fast line regulation. Use Value: 0.005%/V line regulation and analog multiplier feedback ensure stable output under varying bus voltage conditions. | Use Scenario: Compact 5V/2A power stage in portable benchtop instruments with space-constrained enclosures. IC Role / Device Role / Timing Role: Surface-mount DC/DC converter with integrated thermal management. Use Value: DD Pak package with θJC = 4°C/W allows direct heatsink mounting-eliminates need for bulky through-hole TO-220. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1074CN#PBF | 4.4A output current, same 100kHz frequency, wider input range (7.3V–45V), different pinout (7-lead DD Pak). | Higher current capability but requires redesign of PCB layout and inductor selection. | Select when >2A continuous load is required and board space allows 7-lead footprint. |
| LT3430EDD#PBF | 2.75A output, 200kHz switching, lower quiescent current (2.5mA), TSSOP-16 package, adjustable output. | Requires external feedback resistors; better suited for low-IQ and higher-frequency EMI-sensitive designs. | Select when adjustable output, smaller footprint, or ultra-low standby power is prioritized over fixed 5V simplicity. |
Compared with LT1076CQ-5, LT1074CN#PBF offers higher current but demands layout change, while LT3430EDD#PBF trades fixed 5V simplicity for adjustability and lower IQ, making it preferable in battery-powered or space-constrained applications where programmability justifies added design effort.
Availability
LT1076CQ-5 is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery converters, programmable logic controllers, and test equipment requiring stable component supply with long-lifecycle support.
Supply support for LT1076CQ-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 precision analog and power IC portfolio. The company specializes in high-performance signal conditioning and power management solutions for demanding applications.
The LT1076CQ-5 belongs to Linear's monolithic switching regulator product line, designed specifically for rugged, low-component-count DC/DC conversion in industrial and transportation systems where reliability and topology flexibility are critical.
FAQ
What is the maximum input voltage rating for the LT1076CQ-5 in buck configuration?
The LT1076CQ-5 has an absolute maximum input voltage rating of 45V in standard buck operation. Its recommended operating input range is 8V to 60V, but sustained operation above 45V risks permanent damage. For higher input applications, the LT1076HVCT-5 variant supports up to 64V input and should be selected instead of the LT1076CQ-5.
Does the LT1076CQ-5 require an external current-sense resistor?
No, the LT1076CQ-5 does not require an external current-sense resistor. It incorporates on-chip pulse-by-pulse current limiting with a factory-trimmed 2.6A threshold (ILIM open). An optional external resistor (RLIM) can adjust the limit between 1.2A and 3.2A, but sensing is fully internal-reducing component count and layout complexity compared to controller-only ICs.
Can the LT1076CQ-5 generate a negative output voltage?
Yes, the LT1076CQ-5 can generate a negative output voltage. Its VSW pin is specified to swing 40V below ground, enabling use in positive-to-negative converter and flyback topologies. When configured as an inverting buck-boost, it delivers regulated –5V from a positive input-without requiring additional level-shifting circuitry or external high-side drivers.
What is the thermal performance of the LT1076CQ-5 package?
The LT1076CQ-5 uses a 5-lead plastic DD Pak package with θJC = 4°C/W and θJA = 30°C/W. Its exposed copper tab is electrically connected to GND and serves as the primary thermal path. Proper PCB copper pour under the tab and connection to a heatsink significantly improves power dissipation-enabling reliable 2A operation at ambient temperatures up to 70°C without forced airflow.
Is the LT1076CQ-5 pin-compatible with other LT1076 variants like LT1076CT-5?
No, the LT1076CQ-5 is not pin-compatible with LT1076CT-5. The LT1076CQ-5 uses a 5-lead DD Pak (Q package) with VIN-VSW-GND-VC-FB/SENSE pinout, while LT1076CT-5 uses a 5-lead TO-220 (T package) with VIN-GND-SENSE-VSW-VC ordering. Mechanical and electrical pin assignments differ-PCB layout and footprint must be redesigned when substituting between these packages.
LT1076CQ-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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:
- Surface Mount
- Supplier Device Package:
- DDPAK-5
LT1076CQ-5#PBF FAQ
1.How can I place an order for LT1076CQ-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076CQ-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 LT1076CQ-5#PBF reliable?
The price and inventory of LT1076CQ-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 LT1076CQ-5#PBF is usually 5 days.
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LT1076CQ-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076CQ-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 LT1076CQ-5#PBF?
For technical support, including LT1076CQ-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076CQ-5#PBF requirements.
6.How does Aetrix verify that LT1076CQ-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1076CQ-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 LT1076CQ-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1076CQ-5#PBF?
All LT1076CQ-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076CQ-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 LT1076CQ-5#PBF part is unused and in its original packaging.
Return procedure for LT1076CQ-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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