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Analog Devices Inc. LT1076CR#PBF
- Part No.:
- LT1076CR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1076CR#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:417
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Product details
Overview
LT1076CR#PBF from Analog Devices (formerly Linear Technology) is a 2A monolithic bipolar step-down switching regulator in a 7-lead plastic DD package, featuring 100kHz fixed-frequency operation, programmable current limit (2.6A typical), 8.5mA quiescent current, and operation up to 60V input. It implements a classic buck topology with analog multiplier-based feedback for improved line transient response and is used in industrial power supplies requiring stable 5V–24V outputs.
For engineers reviewing the LT1076CR#PBF datasheet, LT1076CR#PBF pinout, LT1076CR#PBF application, or LT1076CR#PBF equivalent, key selection considerations include its 7-pin DD package thermal performance (θJA = 50°C/W), switch "on" voltage of 1.7V at 2A, shutdown threshold at 2.45V, and compatibility with tapped-inductor configurations for higher output current.
Technical Context
The LT1076CR#PBF uses an internal Darlington NPN switch driven by a saturated PNP, enabling VSW to swing 35V below ground-critical for positive-to-negative and tapped-inductor buck converter topologies. Its analog multiplier in the feedback loop ensures loop gain independence from input voltage, delivering superior line regulation and dynamic response.
Current limiting is implemented via pulse-by-pulse monitoring with ≈600ns detection time; the ILIM pin accepts external resistors to scale current limit down to zero. Frequency shifting (100kHz → 20kHz) activates when FB drops below 1.3V, ensuring controlled short-circuit behavior without minimum on-time violation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous; supports tapped-inductor designs for up to 10A at 5V with proper layout and cooling. |
| Input Voltage Range | 7.3V to 60V; startup possible from 3.5V in inverting/boost modes using self-boot feature. |
| Switching Frequency | 100kHz nominal; shifts linearly to 20kHz when FB < 1.3V to maintain control under low-VOUT or short-circuit conditions. |
| Current Limit | 2.6A typical (ILIM open); adjustable down to zero via external resistor on ILIM pin (RLIM = 5.5kΩ per amp + 1kΩ). |
| Quiescent Current | 8.5mA in normal operation; reduces to 140–300µA in micropower shutdown mode. |
| Reference Voltage | 2.21V ±1.5% over temperature; trimmed internal bandgap reference referenced to GND pin. |
| Thermal Resistance | θJA = 50°C/W (7-lead DD package on 0.5 in² 1 oz copper); θJC = 4°C/W enables heatsink attachment via tab. |
Pinout & Package
The LT1076CR#PBF is housed in a 7-lead plastic DD (R package) with exposed thermal pad connected to GND. Pin 1 is SHDN, Pin 2 is VC, Pin 3 is FB/SENSE, Pin 4 is GND, Pin 5 is ILIM, Pin 6 is VSW, Pin 7 is VIN. The package supports surface-mount assembly and direct heatsinking via the metal tab (GND-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN (Pin 1) | Shutdown control input | Pull ≤0.3V for full micropower shutdown (140µA IQ); pull ≥2.45V to enable switching; 10µA internal pull-up allows capacitor-based soft-start. |
| VC (Pin 2) | Error amplifier output | Drives external RC compensation network; asymmetrical ±140µA source / −1.1mA sink capability minimizes startup overshoot. |
| FB/SENSE (Pin 3) | Inverting input of error amplifier | Compares against 2.21V internal reference; bias current ≤2µA; ripple >100mVp-p causes measurable output voltage shift. |
| GND (Pin 4) | Signal and power ground reference | Internal reference and feedback are referenced to this pin; must connect directly to low-current output node to avoid load regulation error. |
| ILIM (Pin 5) | Current limit programming | 320µA internal current source sets limit; open-circuit = 2.6A; external R to GND scales limit linearly (e.g., 5.5kΩ + 1kΩ = 1A). |
| VSW (Pin 6) | Switch collector output | Drives external inductor/diode; rated for 64V swing relative to VIN and 35V below GND-enables negative-output and flyback topologies. |
| VIN (Pin 7) | Power input and switch emitter | Supplies internal circuitry and serves as high-current switch return path; requires low-ESR, low-inductance bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage dependence in loop gain, enabling near-instantaneous response to line transients and consistent stability across 8–60V input range. |
| Programmable current limit | External resistor on ILIM pin allows precise setting from zero to 3.2A, supporting foldback protection and soft-start via parallel capacitor. |
| Frequency shifting | Automatically reduces switching frequency from 100kHz to 20kHz as FB falls below 1.3V-prevents minimum on-time violation during overload or short-circuit. |
| Micropower shutdown | Reduces total supply current to 140–300µA while maintaining fast wake-up; shutdown pin has built-in hysteresis and 10µA pull-up for reliable control. |
| 7-lead DD thermal design | Exposed GND tab and θJA = 50°C/W enable 2A operation without forced air; compatible with standard SMT reflow profiles and automated optical inspection. |
Applications
| Industrial DC-DC Power Supply | Programmable Lab Power Supply |
|---|---|
Use Scenario: Fixed 12V or 24V output from 24–48V battery or rectified AC bus in factory automation controllers. IC Role / Device Role / Timing Role: Primary buck regulator controlling duty cycle via FB/VC loop; 100kHz switching enables compact magnetics and EMI filtering. Use Value: 8.5mA quiescent current extends battery runtime; programmable current limit protects against motor stall or sensor fault conditions. | Use Scenario: Adjustable 3.3V–30V output with digital voltage/current setpoints in benchtop test equipment. IC Role / Device Role / Timing Role: Core switching controller with external DAC-driven FB divider; frequency shifting maintains regulation during CV/CC transition. Use Value: Analog multiplier feedback ensures stable output despite wide input variation from upstream AC-DC stage; ILIM pin enables precise current limit calibration. |
| Tapped-Inductor Buck Converter | Positive-to-Negative Inverter |
Use Scenario: High-current 5V rail (up to 10A) for FPGA or ASIC core logic from 24V industrial input. IC Role / Device Role / Timing Role: Switch driver with VSW capable of 35V below GND, enabling center-tapped inductor configuration. Use Value: Leverages internal 2.6A switch with external current sharing; eliminates need for external high-side gate driver or synchronous MOSFETs. | Use Scenario: Generating –5V or –12V bias for op-amp rails or RS-232 interface from single 12V supply. IC Role / Device Role / Timing Role: Inverting buck-boost controller using VSW-to-GND swing capability and self-boot startup from low input. Use Value: No external charge pump required; operates down to 4.8V input in inverting mode; shutdown pin enables remote polarity enable/disable. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#PBF | Monolithic 2A synchronous buck; 3.6–55V input; 1MHz switching; integrated MOSFETs; no ILIM pin. | Higher efficiency (>90% at 12V→5V), smaller solution size, but lacks VSW swing capability for inverting/tapped-inductor use. | Select LTC3632 for efficiency-critical, space-constrained 5V/2A applications where only standard buck topology is needed. |
| LM2678SX-5.0/NOPB | 5A buck regulator; 8–40V input; 63kHz fixed frequency; 5V fixed output; no programmable current limit or frequency shift. | Fixed 5V output only; no FB pin for adjustability; higher quiescent current (50mA); no negative-output capability. | Select LM2678 for cost-sensitive, fixed-5V industrial supplies where simplicity and high current outweigh flexibility needs. |
Compared with LTC3632EMSE#PBF and LM2678SX-5.0/NOPB, the LT1076CR#PBF uniquely supports non-standard topologies (inverting, tapped-inductor) via its VSW swing and analog multiplier loop, while offering precise current limit tuning and micropower shutdown-making it optimal for multi-rail, fault-tolerant, or legacy-compatible designs.
Availability
LT1076CR#PBF is available at Aetrix Electronics and suitable for industrial power supplies, programmable lab equipment, and embedded DC-DC converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1076CR#PBF 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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1076CR#PBF belongs to ADI's legacy Linear Technology switching regulator product line, designed specifically for robust, flexible, and thermally efficient industrial and instrumentation power conversion where programmability, fault tolerance, and topology versatility are critical.
FAQ
What is the maximum input voltage rating for the LT1076CR#PBF?
The LT1076CR#PBF has an absolute maximum input voltage rating of 45V. Its recommended operating input voltage range is 7.3V to 60V in buck configuration, with self-boot enabling startup as low as 3.5V in inverting or boost modes. Exceeding 45V risks permanent damage, even if within the 60V functional limit cited for some test conditions.
Can the LT1076CR#PBF be used in a negative-output configuration?
Yes, the LT1076CR#PBF supports positive-to-negative converter topologies due to its VSW pin being rated for 35V below ground. This allows direct connection to the center tap of an inductor or transformer secondary, enabling regulated –5V or –12V outputs from a single positive input-without requiring external level-shifting circuitry.
How is current limit adjusted on the LT1076CR#PBF?
Current limit on the LT1076CR#PBF is adjusted via the ILIM pin: an internal 320µA current source develops voltage across an external resistor (RLIM) tied from ILIM to GND. For the LT1076, RLIM = (ILIM × 5.5kΩ) + 1kΩ. A 10kΩ resistor, for example, sets limit to ≈1.8A. Leaving ILIM open yields the default 2.6A limit.
What is the purpose of frequency shifting in the LT1076CR#PBF?
Frequency shifting in the LT1076CR#PBF reduces switching frequency from 100kHz to 20kHz when the FB pin voltage drops below 1.3V-typically during severe overload or output short-circuit. This prevents violation of the minimum switch on-time (≈600ns), ensuring stable current limiting and avoiding erratic regulation or thermal runaway.
Does the LT1076CR#PBF require an external catch diode?
Yes, the LT1076CR#PBF requires an external Schottky catch diode (e.g., MBR745 or MBR340) connected from VSW to output. Its internal switch is a bipolar NPN transistor, not a synchronous MOSFET, so the diode provides the freewheeling path during switch-off. Diode selection must meet peak reverse voltage (>VIN), average current (>IOUT), and fast recovery requirements.
LT1076CR#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 45V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 35V
- 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-7
LT1076CR#PBF FAQ
1.How can I place an order for LT1076CR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076CR#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 LT1076CR#PBF reliable?
The price and inventory of LT1076CR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1076CR#PBF is usually 5 days.
3.What payment methods are accepted for LT1076CR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1076CR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1076CR#PBF?
LT1076CR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076CR#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 LT1076CR#PBF?
For technical support, including LT1076CR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076CR#PBF requirements.
6.How does Aetrix verify that LT1076CR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1076CR#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 LT1076CR#PBF meets industry standards.
7.What is the process for return or replacement of LT1076CR#PBF?
All LT1076CR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076CR#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 LT1076CR#PBF part is unused and in its original packaging.
Return procedure for LT1076CR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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