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Analog Devices Inc. LT1076CQ#PBF
- Part No.:
- LT1076CQ#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
LT1076CQ#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A DDPAK-5
- Quantity:
- Payment:
- Shipping:
Inventory:531
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Product details
Overview
LT1076CQ#PBF from Analog Devices (formerly Linear Technology) is a 2A monolithic bipolar step-down switching regulator in a 5-lead plastic DD package, operating from 8V to 60V input, delivering adjustable output from 2.5V to 50V at up to 2A, with 100kHz fixed-frequency operation and programmable current limit - used in industrial power supplies requiring compact, rugged DC/DC conversion.
For engineers reviewing the LT1076CQ#PBF datasheet, LT1076CQ#PBF pinout, LT1076CQ#PBF application, or LT1076CQ#PBF equivalent, key selection considerations include its 2.6A factory-set current limit, 8.5mA quiescent supply current, true analog multiplier feedback architecture for line-transient immunity, and compatibility with tapped-inductor and inverting topologies.
Technical Context
The LT1076CQ#PBF implements a classic buck topology with integrated Darlington NPN switch and patented fast-switching PNP drive circuitry enabling VSW swing to 40V below ground - supporting positive-to-negative and negative-boost configurations. Its analog multiplier in the feedback loop ensures loop gain independence from input voltage.
On-chip pulse-by-pulse current limiting responds within ≈600ns, and frequency shifting reduces switching frequency from 100kHz to 20kHz when FB drops below 1.3V - maintaining stable current control during severe overload or short-circuit conditions without external intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous; enables compact 5V/2A or 12V/2A point-of-load supplies without external MOSFETs |
| Input Voltage Range | 8V to 60V; supports wide-range industrial inputs including 24V and 48V rails with margin |
| Switching Frequency | 100kHz ±10%; balances EMI control, inductor size, and efficiency in space-constrained designs |
| Current Limit | 2.6A typical (ILIM open); provides robust overcurrent protection without external sensing resistors |
| Quiescent Current | 8.5mA typical; minimizes no-load power loss in always-on systems |
| Reference Voltage | 2.21V ±1.5%; enables precise output regulation across temperature and line variations |
| Thermal Resistance θJA | 30°C/W; requires minimal copper area (0.5 in² 1 oz.) for full 2A operation at 70°C ambient |
Pinout & Package
LT1076CQ#PBF uses the 5-lead plastic DD (Q) package with exposed thermal pad connected to GND. Pin 1 = VIN, Pin 2 = VSW, Pin 3 = GND, Pin 4 = VC, Pin 5 = FB/SENSE. The package is surface-mount, lead-free, and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and high-side switch source | Must be bypassed with low-ESR capacitor near pin; carries full switch current and high di/dt transients |
| VSW | Switch collector output | Swings to 40V below GND; drives external inductor/diode; requires careful layout to minimize ringing |
| GND | Analog and power reference ground | Must connect directly to output return path - not shared with high-current load paths to avoid regulation error |
| VC | Error amplifier output and compensation node | Connects to RC network for loop stability; sink/source capability enables active compensation |
| FB/SENSE | Inverting input of error amplifier | Connected to resistor divider from output; 2.21V internal reference sets output voltage via R1/R2 ratio |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates line-voltage dependence in loop gain - improves line transient response by >3× vs. conventional PWM controllers |
| Programmable current limit | Adjustable down to zero via external resistor on ILIM pin (not available in Q package but enabled via internal default) |
| Micropower shutdown mode | Reduces supply current to 140–300µA - suitable for battery-backed or energy-sensitive standby states |
| Frequency shifting under low-VOUT | Automatically lowers switching frequency to 20kHz when FB < 1.3V - maintains controlled current delivery during short-circuit |
| Wide input range (8–60V) | Supports direct connection to unregulated 24V/48V industrial buses without pre-regulation stage |
Applications
| Industrial 24V DC/DC Converter | Isolated Negative Rail Generator |
|---|---|
Use Scenario: Converting 24V factory bus to regulated 5V for PLC I/O modules in noisy factory environments. IC Role / Device Role / Timing Role: Primary buck regulator controlling duty cycle via FB feedback; VSW drives external Schottky diode and shielded power inductor. Use Value: 8.5mA quiescent current minimizes standby loss; 60V max input withstands 40V transients per ISO 16750-2; analog multiplier ensures stable regulation during motor-start voltage sags. | Use Scenario: Generating –5V rail from +12V supply for op-amp biasing in precision sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Configured as positive-to-negative inverter; VSW switches in series with inductor to charge/discharge into negative output capacitor. Use Value: VSW swing to 40V below GND enables clean –5V generation without level-shifting; 100kHz operation allows small magnetics; FB accuracy (±1.5%) ensures tight negative rail tolerance. |
| Tapped-Inductor High-Current Buck | Field-Deployable Equipment Power Supply |
Use Scenario: Delivering 5V/10A from 24V input in telecom line card using tapped-inductor topology to reduce conduction loss. IC Role / Device Role / Timing Role: Regulator IC driving center-tapped inductor; VSW connects to tap point; GND referenced to output return for accurate sensing. Use Value: 2.6A internal current limit protects switch during startup; ability to swing VSW 40V below GND enables efficient tapped configuration; thermal resistance (θJA = 30°C/W) supports 10A output with proper board layout. | Use Scenario: Powering portable test equipment with variable input (15–36V) and need for reliable 3.3V/1.5A output across temperature extremes. IC Role / Device Role / Timing Role: Main step-down controller; VC pin used for active compensation; FB divider includes temperature-stable thin-film resistors. Use Value: Operates from –40°C to 85°C (Commercial C-grade); reference drift ≤ ±2.5% over full range; shutdown pin enables remote enable/disable via microcontroller GPIO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1076CT#PBF | Same die in 5-lead TO-220 package; higher θJA (50°C/W), no exposed thermal pad | Requires heatsink for 2A continuous operation above 50°C ambient; less suitable for dense SMT layouts | Select when through-hole assembly or mechanical mounting is required; avoid for high-density PCBs |
| LT3975EMSE#PBF | 42V input, 5A synchronous buck; 2.2MHz switching, integrated MOSFETs, lower IQ (3.3µA) | Higher efficiency at light loads; supports smaller magnetics; lacks analog multiplier architecture and VSW swing capability | Select for high-efficiency, high-frequency, or ultra-low-IQ designs where inverting/tapped topologies are not needed |
Compared with LT1076CT#PBF and LT3975EMSE#PBF, the LT1076CQ#PBF uniquely combines surface-mount convenience, 30°C/W thermal performance, and VSW swing capability for non-standard topologies - making it optimal for space-constrained industrial converters needing flexibility beyond basic buck.
Availability
LT1076CQ#PBF is available at Aetrix Electronics and suitable for industrial power supplies, field-deployable instrumentation, and telecom infrastructure equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT1076CQ#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 product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1076 series.
The LT1076 belongs to Linear's monolithic bipolar switching regulator family, designed for rugged, high-reliability DC/DC conversion in industrial, automotive, and telecom applications where wide input range, fault tolerance, and topology flexibility are critical.
FAQ
What is the maximum input voltage rating for LT1076CQ#PBF?
The LT1076CQ#PBF has an absolute maximum input voltage rating of 45V. It operates continuously over 8V to 60V input, but sustained operation above 45V risks reliability degradation. For 60V operation, the HV variant (LT1076HVCR#PBF) must be used. Always observe derating guidelines in the datasheet's Absolute Maximum Ratings table.
Does LT1076CQ#PBF support adjustable current limiting?
Yes - the LT1076CQ#PBF supports programmable current limiting via the ILIM pin. With ILIM left open, current limit is factory-set to 2.6A. An external resistor from ILIM to GND adjusts limit downward; for LT1076, RLIM ≈ ILIM × 5.5kΩ + 1kΩ. Note: the Q package does not expose ILIM, so adjustment requires the 7-pin variants (e.g., LT1076CT7#PBF).
Can LT1076CQ#PBF be used in a negative-output configuration?
Yes - the LT1076CQ#PBF supports positive-to-negative converter topologies because its VSW pin is specified to swing up to 40V below the GND pin. This enables inverting buck-boost and flyback-like configurations. Application Note 44 provides verified schematics and layout guidance for –5V and –12V outputs from positive inputs.
What is the thermal performance of LT1076CQ#PBF in its Q package?
The LT1076CQ#PBF has θJA = 30°C/W when soldered to 0.5 in² of 1 oz. copper over an internal ground plane. At 2A load and 25°C ambient, junction temperature rise is ≈60°C - well within the 125°C max. For continuous 2A operation at 70°C ambient, ensure ≥0.5 in² thermal pad area and consider airflow or localized copper pour.
How does the analog multiplier in LT1076CQ#PBF improve regulation performance?
The analog multiplier in LT1076CQ#PBF multiplies the error amplifier output by a factor inversely proportional to VIN, making loop gain independent of input voltage. This eliminates line-induced gain variation - resulting in consistent phase margin and >3× faster line transient recovery compared to standard PWM controllers, especially during 24V bus sag events.
LT1076CQ#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:
- 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-5
LT1076CQ#PBF FAQ
1.How can I place an order for LT1076CQ#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076CQ#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#PBF reliable?
The price and inventory of LT1076CQ#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#PBF is usually 5 days.
3.What payment methods are accepted for LT1076CQ#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1076CQ#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1076CQ#PBF?
LT1076CQ#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076CQ#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#PBF?
For technical support, including LT1076CQ#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076CQ#PBF requirements.
6.How does Aetrix verify that LT1076CQ#PBF is sourced from the original manufacturer or authorized distributors?
All LT1076CQ#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#PBF meets industry standards.
7.What is the process for return or replacement of LT1076CQ#PBF?
All LT1076CQ#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076CQ#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#PBF part is unused and in its original packaging.
Return procedure for LT1076CQ#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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