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Analog Devices Inc. LT1076CR#TRPBF
- Part No.:
- LT1076CR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1076CR#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:373
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Product details
Overview
LT1076CR#TRPBF from Analog Devices (formerly Linear Technology) is a 2A monolithic bipolar buck switching regulator in a 7-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 switching frequency and programmable current limit-used in industrial DC/DC conversion where compact high-voltage step-down is required.
For engineers reviewing the LT1076CR#TRPBF datasheet, LT1076CR#TRPBF pinout, LT1076CR#TRPBF application, or LT1076CR#TRPBF equivalent, key selection considerations include its 7-pin DD package with SHDN/ILIM pins, 2.6A factory-set current limit, micropower shutdown (140µA), true analog multiplier feedback for line transient immunity, and compatibility with tapped-inductor and inverting topologies.
Technical Context
The LT1076CR#TRPBF implements a classic buck topology enhanced by an on-chip analog multiplier in the feedback loop, making loop gain independent of input voltage and enabling near-instantaneous response to VIN transients. Its Darlington NPN switch (vs. LT1074's bipolar Darlington) delivers lower saturation voltage at 2A load.
It supports multiple configurations beyond basic buck: positive-to-negative conversion, negative boost, and tapped-inductor buck (up to 10A at 5V). The 7-pin R-package enables external current limit adjustment via ILIM pin and full micropower shutdown control via SHDN pin-features unavailable in the 5-pin Q-package variants.
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 bus systems |
| Switching Frequency | 100kHz ±10%; balances EMI, inductor size, and efficiency for mid-power applications |
| Current Limit | 2.6A typical (ILIM open); externally adjustable down to zero via resistor to GND on ILIM pin |
| Quiescent Current | 8.5mA normal operation; drops to 140µA in micropower shutdown mode |
| Reference Voltage | 2.21V ±1.5%; precision trimmed internal reference enables stable output regulation across temperature |
| Thermal Resistance | θJA = 50°C/W; requires minimal copper area for thermal management in DD package |
Pinout & Package
LT1076CR#TRPBF uses the 7-lead plastic DD (R) package with exposed thermal pad (case grounded). Pin 1 is VIN; pin 7 is also VIN (dual-input configuration for high-current routing). The package is surface-mount, lead-free, and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 - VIN | Power input & switch source | Dual VIN pins reduce trace inductance and power loss; connect both to bulk input capacitor |
| 2 - VC | Error amplifier output | Compensation node; connects to RC network for loop stability and frequency response tuning |
| 3 - FB/SENSE | Inverting error amp input | Connects to resistive divider from output; regulates VOUT via 2.21V reference |
| 4 - GND | Analog ground reference | Must be connected directly to low-noise output return path-no high-current traces allowed |
| 5 - ILIM | Current limit programming | Internal 320µA current source; resistor to GND sets trip threshold (e.g., 10kΩ ≈ 1.8A) |
| 6 - VSW | Switch collector output | Drives external inductor/diode; swings to 40V below GND-enables inverting and flyback modes |
| - SHDN (pin 1 of 7-pin layout) | Shutdown control | Active-low; 2.45V threshold for partial shutdown, 0.3V for full micropower mode (140µA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates line-regulation dependency in loop gain-ensures consistent transient response across 8–60V input range |
| Programmable current limit | Adjustable from 0A to 3.2A via single resistor on ILIM pin-supports soft-start and foldback protection |
| Micropower shutdown | Reduces total supply current to 140µA-critical for battery-backed or always-on industrial monitoring systems |
| Multi-topology support | Validated for buck, positive-to-negative, negative boost, and tapped-inductor configurations-reduces BOM count across power architectures |
| Frequency shifting at low VOUT | Automatically reduces switching frequency from 100kHz to 20kHz when FB < 1.3V-maintains short-circuit current control without minimum on-time violation |
Applications
| Industrial 24V-to-5V Conversion | Isolated Negative Rail Generation |
|---|---|
Use Scenario: Converting unregulated 24V industrial bus to clean 5V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator controlling duty cycle via FB/VC loop; VSW drives external Schottky diode and 25µH inductor. Use Value: Delivers 2A at >85% efficiency with only 8 external components; 100kHz operation allows small magnetics and low-profile layout. | Use Scenario: Generating –5V rail from +12V supply for op-amp biasing in precision analog front-ends. IC Role / Device Role / Timing Role: Configured as positive-to-negative converter; VSW switches inverting topology with coupled inductor and catch diode. Use Value: Eliminates need for isolated DC/DC module-reduces cost and board space while maintaining ±1% output regulation over load and temperature. |
| Tapped-Inductor High-Current Buck | Wide-Input Telecom Power Supply |
Use Scenario: Delivering 5V/10A from 36V telecom rectified input using tapped-inductor architecture. IC Role / Device Role / Timing Role: Regulator IC driving center-tapped inductor; VSW swing to –40V below GND enables dual-switch action in single device. Use Value: Achieves 10A output with LT1076CR#TRPBF's 2A rating-leverages topology innovation to multiply current capability without paralleling ICs. | Use Scenario: Powering FPGA core and auxiliary rails in telecom base station equipment with 36–72V input range. IC Role / Device Role / Timing Role: Input-stage buck controller accepting up to 60V VIN; ILIM pin configured for 2.6A limit to protect against surge events. Use Value: Maintains regulation during brownouts (down to 8V startup) and withstands 64V transients-meets GR-1089-CORE surge immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE#TRPBF | Monolithic 2A synchronous buck; 3.6–100V input; 1MHz switching; integrated MOSFETs | Higher efficiency (>92%), smaller solution size, but no multi-topology support or VSW swing below GND | Choose for higher efficiency and reduced external component count where inverting/tapped-inductor operation is not needed |
| LM5088MHX/NOPB | 2.5A current-mode controller; 4.5–100V input; external MOSFETs; no integrated switch | Greater flexibility in power stage design and thermal management, but requires gate driver and discrete FETs | Choose for >60V input or custom high-efficiency power stages where discrete switch optimization is critical |
Compared with LTC3632EMSE#TRPBF and LM5088MHX/NOPB, LT1076CR#TRPBF uniquely combines integrated bipolar switch, multi-topology capability, and sub-GND VSW swing-making it irreplaceable for inverting or tapped-inductor designs requiring ≤7-pin simplicity and proven industrial reliability.
Availability
LT1076CR#TRPBF is available at Aetrix Electronics and suitable for industrial automation, telecom power systems, and embedded instrumentation requiring stable component supply, long-term lifecycle support, and proven field reliability in harsh environments.
Supply support for LT1076CR#TRPBF 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 technical and manufacturing continuity for legacy Linear power products.
The LT1076 belongs to Linear's monolithic bipolar switching regulator family, designed for rugged, high-voltage DC/DC conversion in industrial, telecom, and military-aerospace applications where simplicity, fault tolerance, and topology flexibility outweigh ultra-high efficiency demands.
FAQ
What is the maximum input voltage rating for LT1076CR#TRPBF?
The absolute maximum input voltage for LT1076CR#TRPBF is 45V. It operates continuously over 8V to 60V input, but must not exceed 45V under any condition-including transients-to avoid permanent damage. The LT1076HVCR variant supports up to 64V input.
Can LT1076CR#TRPBF be used in a positive-to-negative converter configuration?
Yes, LT1076CR#TRPBF supports positive-to-negative conversion. Its VSW pin can swing up to 40V below ground, enabling validated inverting topologies. Application Note AN44 provides schematic and layout guidance for –5V/1A generation using LT1076CR#TRPBF.
How is current limit set on LT1076CR#TRPBF, and what is the default value?
With ILIM pin left open, LT1076CR#TRPBF defaults to 2.6A typical current limit. A resistor from ILIM to GND adjusts it downward: RLIM = ILIM × 5.5kΩ + 1kΩ. For example, 10kΩ yields ~1.8A. Accuracy is ±25% across 1.2–3.2A range.
Does LT1076CR#TRPBF require an external catch diode, and what type is recommended?
Yes, LT1076CR#TRPBF requires an external catch diode. For 2A operation, MBR340 (40V, 3A Schottky) is specified in the datasheet. Higher voltage ratings (e.g., MBR745 for 45V) are recommended for 36–60V input applications to ensure sufficient reverse voltage margin.
What is the thermal performance of LT1076CR#TRPBF in its R-package?
LT1076CR#TRPBF in the 7-lead DD (R) package has θJA = 50°C/W and θJC = 4°C/W. With 1 cm² of 1 oz. copper connected to the exposed thermal pad, junction-to-ambient rise is ~100°C at 2A full load-requiring moderate heatsinking or airflow for continuous operation above 1.5A.
LT1076CR#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1076CR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076CR#TRPBF 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#TRPBF reliable?
The price and inventory of LT1076CR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1076CR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1076CR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1076CR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1076CR#TRPBF?
LT1076CR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076CR#TRPBF 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#TRPBF?
For technical support, including LT1076CR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076CR#TRPBF requirements.
6.How does Aetrix verify that LT1076CR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1076CR#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1076CR#TRPBF?
All LT1076CR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076CR#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1076CR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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