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Analog Devices Inc. LT1076HVCR#PBF
- Part No.:
- LT1076HVCR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1076HVCR#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
LT1076HVCR#PBF from Analog Devices (formerly Linear Technology) is a 2A monolithic bipolar buck switching regulator with high-voltage operation up to 64V input and switch voltage rating of 75V relative to ground. It features 100kHz fixed-frequency operation, programmable current limit (2.6A typical), 8.5mA quiescent current, and true analog multiplier feedback for line-regulation independence. It is used in industrial power supplies requiring robust 40–60V input conversion to stable 5V or adjustable outputs.
For engineers reviewing the LT1076HVCR#PBF datasheet, LT1076HVCR#PBF pinout, LT1076HVCR#PBF application, or LT1076HVCR#PBF equivalent, key selection criteria include HV-rated input capability, 7-pin DD package thermal performance (θJA = 35°C/W), tapped-inductor support for 10A output, and micropower shutdown (140µA).
Technical Context
The LT1076HVCR#PBF implements a classic buck topology enhanced with an analog multiplier in the feedback loop, making loop gain independent of input voltage and enabling near-instantaneous response to line transients. Its Darlington NPN switch (vs. single NPN in standard LT1076) supports higher breakdown and 45V negative swing capability relative to ground.
It integrates pulse-by-pulse current limiting, frequency downshifting below 1.3V FB voltage (to 20kHz), and dual-mode shutdown-partial duty-cycle disable at ~2.35V and full micropower mode below 0.3V-with internal 320µA ILIM bias current enabling resistor-programmable current limit down to zero.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 64V - Enables direct use with 48V industrial bus or automotive battery systems without pre-regulation. |
| Switch Voltage (VSW to GND) | –45V - Allows tapped-inductor buck configuration delivering up to 10A at 5V with proper diode selection. |
| Output Current Rating | 2A continuous - Matches LT1076HV variant; higher than standard LT1076 (2.6A current limit, not 5A like LT1074HV). |
| Switching Frequency | 100kHz ±10% - Fixed oscillator simplifies EMI filtering; frequency downshifts to 20kHz under short-circuit for stable current control. |
| Quiescent Supply Current | 8.5mA - Enables low-power standby operation; drops to 140µA in micropower shutdown mode. |
| Reference Voltage | 2.21V ±1.5% - Precision trimmed bandgap reference enables accurate output regulation across temperature and load. |
| Thermal Resistance θJA | 35°C/W - Measured in 7-lead DD package with 0.5 in² copper; supports 2A operation without forced air at ≤70°C ambient. |
Pinout & Package
The LT1076HVCR#PBF is housed in a 7-lead plastic DD (R package) with exposed thermal pad connected to GND. 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; pin 7 is SHDN. The package is surface-mount, thermally enhanced, and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | High-current input supply and switch source | Must be bypassed with low-ESR capacitor close to pin; carries full switch current and experiences large dI/dt transients. |
| VSW (Pin 2) | Switch collector output | Swings up to 75V above VIN or –45V below GND; drives external inductor/diode; requires careful layout to minimize ringing. |
| GND (Pin 3) | Analog and power ground reference | Internal 2.21V reference tied here; must connect directly to low-current output return path 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 reduces startup overshoot. |
| FB/SENSE (Pin 5) | Inverting input of error amplifier | Compares output divider voltage against 2.21V reference; 0.5µA bias current enables high-resistance feedback dividers. |
| ILIM (Pin 6) | Current limit programming input | Internally biased at 320µA; connects to GND via resistor to set current limit from 0A to 2.6A (e.g., 10kΩ = ~1.8A). |
| SHDN (Pin 7) | Shutdown control input | 2.35V threshold disables switching; <0.3V enables full micropower mode (140µA IQ); 10µA internal pull-up enables open-circuit default-on. |
Key Features
| Feature | Design Value |
|---|---|
| True analog multiplier feedback | Eliminates input-voltage dependence in loop gain, improving line transient response by >3× vs. conventional PWM controllers. |
| Programmable current limit | External resistor from ILIM to GND sets precise trip point from 0A to 2.6A, enabling overcurrent protection tailored to magnetics and MOSFET ratings. |
| Frequency downshifting | Automatically reduces switching frequency from 100kHz to 20kHz when FB falls below 1.3V, maintaining stable current limiting during output shorts. |
| Micropower shutdown | Reduces total supply current to 140µA while preserving state, enabling battery-backed systems to extend runtime during idle periods. |
| High-voltage ruggedness | 64V max input and 75V VSW-to-GND rating allow direct interface with unregulated 48V telecom or industrial rails without external protection. |
Applications
| Industrial 48V DC-DC Conversion | Tapped-Inductor High-Current Buck |
|---|---|
Use Scenario: Converting 36–60V industrial bus to regulated 5V/2A for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck controller managing switch timing, current sensing, and feedback regulation. Use Value: Eliminates need for pre-regulator stage; 64V input rating avoids derating at 48V nominal; 35°C/W θJA enables convection-cooled design. | Use Scenario: Generating 5V/10A from 24–40V input using tapped-inductor topology in motor drive gate supply. IC Role / Device Role / Timing Role: Regulator IC driving center-tapped inductor with VSW swinging –45V below GND to enable high-side synchronous rectification. Use Value: Leverages –45V VSW rating to achieve 10A output without external high-side driver; avoids cost/complexity of dual-controller solutions. |
| Positive-to-Negative Converter | Field-Deployable Equipment Power |
Use Scenario: Generating –5V/1A from 12–35V input for op-amp biasing in portable test equipment. IC Role / Device Role / Timing Role: Inverting buck-boost controller operating in positive-to-negative configuration with fixed 100kHz switching. Use Value: Uses same external components as buck mode; no additional ICs required; 2.21V reference ensures stable negative rail accuracy. | Use Scenario: Powering remote telemetry units in oil/gas field instrumentation where input varies from 9–56V due to long cable drops and battery aging. IC Role / Device Role / Timing Role: Primary voltage regulator with undervoltage lockout (UVLO) programmed via SHDN pin and hysteresis resistor. Use Value: SHDN pin supports UVLO with 2.35V threshold and optional hysteresis; 8.5mA IQ minimizes battery drain during sleep cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3642EMSE#PBF | 40V max input, 2A integrated MOSFET, 3mm × 4mm MSOP, 2.5MHz switching | Better efficiency at light loads; unsuitable for >40V inputs or –45V VSW swing requirements | Select for compact, high-frequency designs with ≤40V input; avoid where HV input or tapped-inductor topology is needed. |
| LM5088MHX/NOPB | 65V max input, 5A external FET driver, current-mode control, SOIC-8 | Requires external high-side MOSFET; lacks analog multiplier; no frequency downshifting or micropower shutdown | Select when higher output current (>2A) or external FET optimization is required; accept added component count and reduced line-transient performance. |
Compared with LTC3642EMSE#PBF and LM5088MHX/NOPB, the LT1076HVCR#PBF uniquely combines 64V input tolerance, –45V VSW swing, analog multiplier-based line regulation, and programmable current limit in a single 7-pin DD package-making it optimal for ruggedized 48V industrial buck and tapped-inductor designs where reliability and topology flexibility outweigh ultra-high frequency or integration density.
Availability
LT1076HVCR#PBF is available at Aetrix Electronics and suitable for industrial power supplies, motor drive auxiliary rails, field instrumentation, and telecom infrastructure requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1076HVCR#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 its legacy high-performance analog and power management product lines.
The LT1076HVCR#PBF belongs to the LT1074/LT1076 family of monolithic bipolar switching regulators designed for rugged industrial and telecom DC-DC conversion where high input voltage, wide output adjustability, and fault resilience are critical.
FAQ
What is the maximum input voltage rating for the LT1076HVCR#PBF?
The LT1076HVCR#PBF has an absolute maximum input voltage rating of 64V, as specified in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1076 (45V max) and makes it suitable for direct connection to 48V industrial or telecom distribution buses without pre-regulation. Operation above 60V is not recommended for long-term reliability.
Does the LT1076HVCR#PBF support programmable current limiting, and how is it implemented?
Yes, the LT1076HVCR#PBF supports programmable current limiting via the ILIM pin (Pin 6). An internal 320µA current source pulls this pin high; connecting an external resistor RLIM from ILIM to GND sets the current limit according to RLIM = ILIM(5.5kΩ) + 1kΩ. For example, a 10kΩ resistor yields ~1.8A limit. The LT1076HVCR#PBF datasheet confirms this formula applies specifically to the LT1076 variant.
What package type and thermal characteristics does the LT1076HVCR#PBF use?
The LT1076HVCR#PBF uses the 7-lead plastic DD (R package) with exposed thermal pad tied to GND. Its thermal resistance is θJA = 35°C/W when mounted on a PCB with 0.5 in² of 1 oz. copper over an internal ground plane. This allows reliable 2A operation at up to 70°C ambient without forced airflow, as verified in the Thermal Resistance section of the official datasheet.
Can the LT1076HVCR#PBF be used in a positive-to-negative converter configuration?
Yes, the LT1076HVCR#PBF can be configured as a positive-to-negative converter, as confirmed in the "Typical Applications" section of its datasheet (Figure TA03). Its ability to swing VSW to –45V relative to GND enables this topology. External component values (inductor, diodes, feedback resistors) must follow the published design equations and layout guidelines to ensure stability and efficiency.
What is the function of the SHDN pin on the LT1076HVCR#PBF, and what are its thresholds?
The SHDN pin (Pin 7) provides dual-mode control: at ~2.35V it disables switching (duty cycle = 0) while maintaining bias current; below ~0.3V it activates full micropower shutdown with total supply current dropping to 140µA. The pin includes a 10µA internal pull-up, allowing default-on operation when left open. These thresholds and behavior are explicitly defined in the Electrical Characteristics table and Shutdown Pin Characteristics graphs.
LT1076HVCR#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):
- 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#PBF FAQ
1.How can I place an order for LT1076HVCR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076HVCR#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 LT1076HVCR#PBF reliable?
The price and inventory of LT1076HVCR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1076HVCR#PBF is usually 5 days.
3.What payment methods are accepted for LT1076HVCR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1076HVCR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1076HVCR#PBF?
LT1076HVCR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076HVCR#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 LT1076HVCR#PBF?
For technical support, including LT1076HVCR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076HVCR#PBF requirements.
6.How does Aetrix verify that LT1076HVCR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1076HVCR#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 LT1076HVCR#PBF meets industry standards.
7.What is the process for return or replacement of LT1076HVCR#PBF?
All LT1076HVCR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076HVCR#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 LT1076HVCR#PBF part is unused and in its original packaging.
Return procedure for LT1076HVCR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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