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Analog Devices Inc. LT1076HVCR#TRPBF
- Part No.:
- LT1076HVCR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1076HVCR#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:678
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Product details
Overview
LT1076HVCR#TRPBF from Analog Devices (formerly Linear Technology) is a 2A monolithic bipolar step-down switching regulator with integrated power switch, oscillator, and current-limit circuitry. It operates from 8V to 60V input, delivers adjustable output from 2.5V to 50V, features 100kHz fixed-frequency operation, 8.5mA quiescent current, and supports tapped-inductor buck, positive-to-negative, and negative-boost topologies in industrial power supplies.
For engineers reviewing the LT1076HVCR#TRPBF datasheet, LT1076HVCR#TRPBF pinout, LT1076HVCR#TRPBF application, or LT1076HVCR#TRPBF equivalent, key selection criteria include its HV-rated 64V input capability, 2.6A programmable current limit, 7-pin DD package thermal performance (θJA = 35°C/W), and analog-multiplier-based feedback for line-transient immunity.
Technical Context
The LT1076HVCR#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 (single NPN for LT1076 variant) is rated for 75V VSW–GND swing, enabling 45V negative output capability in inverting configurations.
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. Frequency shifting below 1.3V FB voltage reduces switching frequency to 20kHz under short-circuit conditions to maintain control at sub-microsecond on-times.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 60V - supports wide-input industrial and automotive battery-supplied systems without external pre-regulation. |
| Output Voltage Range | 2.5V to 50V - adjustable via external resistor divider; enables single IC to cover multiple rail requirements. |
| Switch Current Limit | 2.6A (ILIM open) - protects against overload/shorts; externally adjustable down to zero with 7-pin package. |
| Switching Frequency | 100kHz (±10%) - fixed frequency simplifies EMI filtering; shifts to 20kHz under low-VFB for short-circuit stability. |
| Quiescent Current | 8.5mA - enables efficient operation in standby modes; drops to 140µA in micropower shutdown. |
| Thermal Resistance | θJA = 35°C/W - measured on 0.5 in² 1 oz copper; enables 2A continuous operation without forced airflow. |
| Reference Voltage | 2.21V ±1.5% - precision trimmed bandgap reference ensures ±2.5% total output tolerance over temp/load. |
Pinout & Package
The LT1076HVCR#TRPBF is housed in a 7-lead plastic DD (R package) with exposed thermal pad. Pin 1 is VIN, Pin 2 is VSW, Pin 3 is GND, Pin 4 is VC, Pin 5 is FB/SENSE, Pin 6 is ILIM, and Pin 7 is SHDN. The package is surface-mount, thermally enhanced, and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply and high-side switch source | Carries full input current; must be bypassed with low-ESR capacitor placed adjacent to pin to suppress dI/dt spikes. |
| VSW (Pin 2) | Switch collector output | Swings up to 45V below GND; enables negative-output and tapped-inductor configurations without level-shifting. |
| GND (Pin 3) | Analog and power ground reference | Internal 2.21V reference is referenced here; must connect directly to low-current output return point to avoid load regulation error. |
| VC (Pin 4) | Error amplifier output and compensation node | Drives external RC network; asymmetrical ±140µA/1.1mA sink-source capability minimizes startup overshoot. |
| FB/SENSE (Pin 5) | Inverting input of error amplifier | Compares output divider voltage to 2.21V reference; bias current <2µA enables high-resistance dividers. |
| ILIM (Pin 6) | Current limit programming input | Internally sourced with 320µA; voltage sets trip point - open = 4.5V ≈ 2.6A; external resistor scales limit linearly. |
| SHDN (Pin 7) | Shutdown control input | 2.45V threshold enables undervoltage lockout; 0.3V threshold activates full micropower mode (<300µA total IQ). |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage dependence in loop gain, reducing line transient response time to <10µs and enabling stable regulation across 8–60V input range. |
| Programmable current limit | Adjustable from 0A to 3.2A via ILIM pin resistor; supports soft-start and foldback protection without external components. |
| Frequency shifting | Automatically reduces switching frequency from 100kHz to 20kHz when FB drops below 1.3V, maintaining precise current control during output shorts. |
| Micropower shutdown | Reduces total supply current to ≤300µA while preserving state; enables battery-backed systems to achieve multi-year standby life. |
| HV input rating | 64V absolute max input and 75V VSW–GND rating support 48V telecom, industrial 24/48V DC distribution, and automotive cold-crank scenarios. |
Applications
| Industrial 24V DC-DC Converter | 48V Telecom Power Supply |
|---|---|
Use Scenario: Regulating 24V bus down to 5V/3.3V for PLC I/O modules in factory automation cabinets with ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary buck controller with integrated switch; handles full 2A load without external MOSFETs or gate drivers. Use Value: Eliminates need for discrete high-voltage MOSFET and driver, reducing BOM count by ≥4 parts and PCB area by >30% versus controller+MOSFET solutions. | Use Scenario: Generating –5V at 1A from a 48V backplane in telecom line cards requiring negative bias for op-amps and ADCs. IC Role / Device Role / Timing Role: Positive-to-negative inverting converter; uses VSW's 45V negative swing capability to drive tapped inductor without isolation transformer. Use Value: Achieves >85% efficiency at full load with no optocoupler or secondary-side sensing, simplifying safety certification and reducing layout complexity. |
| Automotive Battery Management System | Test Equipment Auxiliary Rail |
Use Scenario: Providing isolated 12V auxiliary rail from vehicle 12V/24V battery during cold-crank (down to 4.5V) with robust start-up and UVLO hysteresis. IC Role / Device Role / Timing Role: Buck regulator with programmable UVLO (via SHDN pin divider); maintains regulation through 6V dips using self-boot feature. Use Value: Enables reliable microcontroller boot during engine cranking without external LDO pre-bias, avoiding brown-out resets in critical BMS firmware. | Use Scenario: Generating a clean, adjustable 15V/2A bench supply rail inside automated test equipment with strict ripple (<50mVpp) and fast transient response requirements. IC Role / Device Role / Timing Role: Adjustable buck controller with analog-multiplier loop; delivers <1% output deviation during 1A step loads due to line-independent gain. Use Value: Reduces need for post-regulation LDOs and large bulk capacitance, cutting cost and thermal dissipation in space-constrained ATE chassis. |
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 | 42V max input, 2.5A, synchronous, 3mm × 4mm MSOP; requires external MOSFETs for >42V operation. | Not suitable for 60V input or negative-output topologies; lacks VSW swing capability below GND. | Select only if input stays ≤42V and synchronous efficiency >90% is required; not drop-in for LT1076HVCR#TRPBF's HV or inverting use cases. |
| LM5085MYX/NOPB | 65V max input, 5A peak, external MOSFET controller; no integrated switch or analog multiplier feedback. | Requires external high-side N-channel MOSFET, driver, and compensation; slower line transient response due to conventional error amp. | Choose when higher current (>2A) or custom FET selection is needed; adds ≥6 components and increases design validation effort. |
Compared with LTC3632EMSE#PBF and LM5085MYX/NOPB, the LT1076HVCR#TRPBF uniquely combines 60V input rating, integrated bipolar switch, analog-multiplier loop, and 45V negative VSW swing - enabling compact, high-reliability buck, inverting, and tapped-inductor designs without external active components or complex compensation.
Availability
LT1076HVCR#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, telecom DC-DC converters, automotive battery management systems, and test equipment auxiliary rails requiring stable component supply and long-term lifecycle support.
Supply support for LT1076HVCR#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 product support, datasheets, and application notes for legacy Linear parts including the LT1076 family.
The LT1076HVCR#TRPBF belongs to Linear's high-voltage monolithic switching regulator product line, designed specifically for ruggedized industrial, telecom, and automotive power conversion where integration, input voltage range, and topology flexibility outweigh synchronous efficiency requirements.
FAQ
What is the maximum input voltage rating for the LT1076HVCR#TRPBF?
The LT1076HVCR#TRPBF has an absolute maximum input voltage rating of 64V and is specified for continuous operation from 8V to 60V. This HV rating distinguishes it from the standard LT1076 (45V max), making it suitable for 48V telecom systems and industrial 24/48V DC distribution networks where input transients exceed 45V.
Can the LT1076HVCR#TRPBF be used in a negative-output configuration?
Yes, the LT1076HVCR#TRPBF supports positive-to-negative converter topologies because its VSW pin is rated to swing 45V below ground. When configured as an inverting buck-boost, it can deliver regulated negative outputs such as –5V at 1A from a 24V input, eliminating the need for isolated transformers or dedicated negative regulators.
How is current limit set on the LT1076HVCR#TRPBF?
Current limit on the LT1076HVCR#TRPBF is set via the ILIM pin, which is internally sourced with a 320µA current. With ILIM left open, the pin self-clamps at ~4.5V, resulting in a nominal 2.6A switch current limit. Connecting an external resistor from ILIM to GND scales the limit linearly - e.g., 10kΩ yields ~1.8A, and 7kΩ yields ~1.2A - enabling precise overload protection.
Does the LT1076HVCR#TRPBF require external compensation components?
Yes, the LT1076HVCR#TRPBF requires external RC compensation connected between the VC pin and GND to stabilize the control loop. The error amplifier's transconductance (5000µmho) and output impedance interact with this network to set dominant pole and zero locations; typical values are RC = 10kΩ and CC = 100nF, but exact values depend on output voltage, inductance, and load conditions per AN44 guidelines.
What thermal performance can be expected from the LT1076HVCR#TRPBF in a 2A application?
With θJA = 35°C/W on a standard 0.5 in² 1 oz copper PCB, the LT1076HVCR#TRPBF dissipates ~0.8W at 2A output (assuming 12V→5V @ 85% efficiency), resulting in ~28°C junction-to-ambient rise above board temperature. This allows reliable 2A continuous operation at +85°C ambient without heatsinking or forced air, meeting industrial temperature requirements.
LT1076HVCR#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):
- 64V
- 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
LT1076HVCR#TRPBF FAQ
1.How can I place an order for LT1076HVCR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076HVCR#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 LT1076HVCR#TRPBF reliable?
The price and inventory of LT1076HVCR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1076HVCR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1076HVCR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1076HVCR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1076HVCR#TRPBF?
LT1076HVCR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076HVCR#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 LT1076HVCR#TRPBF?
For technical support, including LT1076HVCR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076HVCR#TRPBF requirements.
6.How does Aetrix verify that LT1076HVCR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1076HVCR#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 LT1076HVCR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1076HVCR#TRPBF?
All LT1076HVCR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076HVCR#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 LT1076HVCR#TRPBF part is unused and in its original packaging.
Return procedure for LT1076HVCR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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