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Analog Devices Inc. LT1076IR#PBF
- Part No.:
- LT1076IR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1076IR#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:148
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Product details
Overview
LT1076IR#PBF from Analog Devices (formerly Linear Technology) is a 2A monolithic bipolar step-down switching regulator in a 7-lead TO-220 package, featuring 100kHz fixed-frequency operation, programmable current limit (2.6A typical), 8.5mA quiescent current, and operation up to 60V input - used in industrial DC/DC power conversion where compact high-voltage buck regulation is required.
For engineers reviewing the LT1076IR#PBF datasheet, LT1076IR#PBF pinout, LT1076IR#PBF application, or LT1076IR#PBF equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply assurance for production-grade embedded power systems.
Technical Context
The LT1076IR#PBF implements a classic buck topology with an integrated Darlington NPN switch and true analog multiplier in the feedback loop - enabling near-instantaneous line transient response and input-voltage-independent loop gain. Its internal oscillator is pre-set to 100kHz and supports frequency downshifting below 1.3V FB voltage to maintain control during short-circuit conditions.
Current limiting is pulse-by-pulse and programmable via the ILIM pin using an internal 320µA current source; open-circuit ILIM sets 2.6A limit. The shutdown pin provides dual-mode control: partial duty-cycle inhibition above ~2.35V and full micropower shutdown below ~0.3V, drawing only 140–300µA in that state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current Rating | 2A continuous - defines maximum sustained load without thermal derating under standard heatsinking (θJA = 35°C/W). |
| Switching Frequency | 100kHz nominal - enables use of compact magnetics while balancing EMI and efficiency; shifts down to ~20kHz at low FB voltage for short-circuit control. |
| Input Voltage Range | 8V to 60V - supports wide-range industrial inputs including 24V and 48V rails, with self-boot capability down to 5V in inverting configurations. |
| Quiescent Supply Current | 8.5mA - enables low-noise, high-efficiency operation in standby-sensitive applications without external bias supplies. |
| Current Limit Accuracy | 2.0A to 3.2A (min–max) - ensures robust overload protection across temperature and process variation; adjustable downward with external resistor. |
| Reference Voltage | 2.21V ±1.5% - sets output voltage accuracy via external resistor divider; line and load regulation preserve stability over operating range. |
| Thermal Resistance θJA | 35°C/W - confirms suitability for TO-220 mounting on 0.5 in² 1 oz copper; junction-to-ambient rise is 70°C at 2A full load. |
Pinout & Package
LT1076IR#PBF uses the 7-lead plastic TO-220 (T7) package with tab connected to GND. Pinout is validated per Linear Technology datasheet SN1074 Rev. D (2009), Figure "T7 PACKAGE".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and high-side switch source | Carries full input current; must be bypassed with low-ESR capacitor close to pin to suppress switching transients. |
| VSW | Switch collector output | Swings up to 40V below ground - enables tapped-inductor and inverting topologies; connects to diode anode or transformer primary. |
| GND | Power and signal reference | Internal reference and error amplifier are referenced here; must connect directly to low-current output return path to avoid load regulation error. |
| VC | Error amplifier output | Drives external compensation network (RC/CC); asymmetrical ±140µA/1.1mA sourcing/sinking prevents startup overshoot. |
| FB/SENSE | Inverting input of error amplifier | Compares output voltage (via divider) against 2.21V internal reference; also triggers frequency downshift when <1.3V. |
| ILIM | Current limit programming | Internally biased at 4.5V (open); external resistor to GND sets lower limit - e.g., 7kΩ yields ~1.2A for LT1076. |
| SHDN | Shutdown control | Pull ≥2.35V to inhibit switching; pull ≤0.3V for full micropower shutdown (140–300µA total supply current). |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage dependence in loop gain - improves line transient response by >3× vs conventional PWM controllers. |
| Programmable current limit | Enables precise overcurrent protection tuning without changing PCB layout - supports foldback via optional RFB from output to ILIM. |
| Frequency downshifting | Maintains stable current limiting at <20% nominal output voltage - avoids minimum-on-time violation during short-circuit recovery. |
| Micropower shutdown | Reduces total input current to <300µA - suitable for battery-backed or energy-harvesting systems requiring ultra-low standby drain. |
| True buck + inverting capability | Single IC supports buck, positive-to-negative, and negative-boost topologies - reduces BOM count in multi-rail industrial power designs. |
Applications
| Industrial 24V-to-5V Conversion | Isolated Negative Rail Generation |
|---|---|
Use Scenario: Converting unregulated 24V factory bus to clean 5V for PLC I/O modules with tight ripple and thermal constraints. IC Role / Device Role / Timing Role: Primary buck regulator controlling MOSFET/diode power stage; 100kHz switching sets filter component size and EMI profile. Use Value: 8.5mA quiescent current minimizes no-load losses; 2.6A current limit protects against field-wiring faults without external sensing. | Use Scenario: Generating –5V from +24V supply for op-amp biasing in precision sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Positive-to-negative converter with VSW swinging below GND; FB pin regulates inverted output magnitude. Use Value: Eliminates need for separate inverting charge pump or isolated DC/DC module - reduces footprint and cost by 40%. |
| High-Voltage Telecom Power | Programmable Current-Limited Load |
Use Scenario: Stepping down 48V telecom distribution rail to 3.3V for FPGA core logic in remote radio units. IC Role / Device Role / Timing Role: High-input-voltage buck controller driving external Schottky diode and custom inductor; ILIM pin adjusted for 1.5A max. Use Value: 60V absolute max input rating allows direct connection to -48V system without pre-regulator; thermal resistance supports 70°C ambient. | Use Scenario: Driving a variable-resistance heater element with strict current capping to prevent thermal runaway. IC Role / Device Role / Timing Role: Constant-current source configured via ILIM resistor and output sense resistor; SHDN pin enables remote enable/disable. Use Value: Pulse-by-pulse current limiting reacts within 600ns - faster than microcontroller-based current monitoring, ensuring hardware-level safety. |
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; 35µA quiescent current. | Higher efficiency (>92% at 12V→5V/2A), smaller solution size, but lacks VSW swing below GND and inverting capability. | Select LTC3632 for higher efficiency and lower EMI in space-constrained designs where only buck operation is needed. |
| LM2596S-5.0/NOPB | 3A buck regulator; 4.5–40V input; 150kHz; fixed 5V output; no ILIM or SHDN pins; TO-263 package. | Lower cost and simpler layout, but no programmable current limit, no shutdown, and limited topology flexibility. | Select LM2596S-5.0 for cost-sensitive 5V-only applications without dynamic control requirements. |
Compared with LTC3632EMSE#PBF and LM2596S-5.0/NOPB, LT1076IR#PBF uniquely supports inverting and tapped-inductor topologies, offers analog multiplier-based line regulation, and provides hardware-programmable current limiting - making it irreplaceable in legacy industrial designs requiring multi-configuration flexibility and proven ruggedness.
Availability
LT1076IR#PBF is available at Aetrix Electronics and suitable for industrial automation, telecom power supplies, and test equipment requiring stable component supply, long-lifecycle support, and proven reliability in high-voltage DC/DC conversion.
Supply support for LT1076IR#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 acquired Linear Technology in 2017 and maintains full support for legacy Linear power products. Linear was founded to deliver high-performance analog ICs with exceptional precision and ruggedness.
The LT1076 belongs to Linear's monolithic switching regulator family designed for industrial and telecom applications demanding wide input range, robust fault protection, and flexible topology support beyond basic buck conversion.
FAQ
What is the maximum input voltage rating for LT1076IR#PBF?
The LT1076IR#PBF has an absolute maximum input voltage rating of 60V. This applies to the VIN pin relative to GND. Exceeding this voltage risks permanent damage. For applications requiring >60V input, consider the LT1076HVIR variant rated to 64V input.
Can LT1076IR#PBF be used in a positive-to-negative converter configuration?
Yes, LT1076IR#PBF supports positive-to-negative conversion. Its VSW pin is specified to swing up to 40V below GND, enabling inverting buck-boost topologies. Reference design LT1074•TA03 (adapted for LT1076) demonstrates –5V generation from +24V input using standard external components.
How do I set a custom current limit on LT1076IR#PBF?
To set a custom current limit on LT1076IR#PBF, connect a resistor (RLIM) between the ILIM pin and GND. For the LT1076, RLIM ≈ ILIM × 5.5kΩ + 1kΩ. Example: For 1.2A limit, use RLIM = (1.2 × 5.5k) + 1k = 7.6kΩ. Accuracy is ±25% for limits between 0.7A and 1.8A.
Does LT1076IR#PBF require an external catch diode?
Yes, LT1076IR#PBF requires an external catch diode. It integrates only the main switch (Darlington NPN), not the freewheeling diode. Use a Schottky diode such as MBR745 (7A, 45V) or MBR340 (3A, 40V) depending on output current and voltage requirements.
What is the thermal performance of LT1076IR#PBF in its TO-220 package?
LT1076IR#PBF in the T7 (7-lead TO-220) package has θJA = 35°C/W when mounted on 0.5 in² of 1 oz copper over an internal ground plane. At 2A output and 25V input, typical power dissipation is ~1.8W, resulting in ~63°C junction rise above ambient - well within the 125°C max junction rating for industrial temperature range.
LT1076IR#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1076IR#PBF FAQ
1.How can I place an order for LT1076IR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076IR#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 LT1076IR#PBF reliable?
The price and inventory of LT1076IR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1076IR#PBF is usually 5 days.
3.What payment methods are accepted for LT1076IR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1076IR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1076IR#PBF?
LT1076IR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076IR#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 LT1076IR#PBF?
For technical support, including LT1076IR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076IR#PBF requirements.
6.How does Aetrix verify that LT1076IR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1076IR#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 LT1076IR#PBF meets industry standards.
7.What is the process for return or replacement of LT1076IR#PBF?
All LT1076IR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076IR#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 LT1076IR#PBF part is unused and in its original packaging.
Return procedure for LT1076IR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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