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Analog Devices Inc. LT1076HVIR#PBF
- Part No.:
- LT1076HVIR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1076HVIR#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:494
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Product details
Overview
LT1076HVIR#PBF 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, 2.6A programmable current limit, and supports buck, positive-to-negative, and negative-boost topologies in industrial power supplies.
For engineers reviewing the LT1076HVIR#PBF datasheet, LT1076HVIR#PBF pinout, LT1076HVIR#PBF application, or LT1076HVIR#PBF equivalent, key selection considerations include its HV-rated 64V input capability, 7-pin TO-220 package with SHDN/ILIM pins for programmable shutdown and current limiting, and compatibility with tapped-inductor designs delivering up to 10A at 5V.
Technical Context
The LT1076HVIR#PBF implements a classic buck topology enhanced with an analog multiplier in the feedback loop, enabling near-instantaneous line transient response and input-voltage-independent loop gain. Its Darlington NPN switch (vs. single NPN in standard LT1076) supports 45V swing below ground, enabling high-current tapped-inductor configurations.
It integrates pulse-by-pulse current limiting with ≈600ns fault detection, frequency downshifting (100kHz → 20kHz) when FB drops below 1.3V to maintain control under short-circuit, and micropower shutdown (<300µA) via a dedicated SHDN pin with 2.45V turn-on threshold and 0.3V full-shutdown level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 8V to 60V - supports wide-input industrial and automotive battery-fed systems without external pre-regulation. |
| Output Voltage Range | 2.5V to 50V - adjustable via external resistor divider; reference voltage trimmed to 2.21V ±1.5% over temperature. |
| Switch Current Limit | 2.6A (ILIM open) - factory-set for robust overload protection; adjustable down to zero with external ILIM resistor. |
| Switching Frequency | 100kHz (±10%) - fixed internal oscillator enables predictable EMI filtering and compact magnetics design. |
| Quiescent Supply Current | 8.5mA (normal mode) - low operating current extends efficiency at light loads; drops to 140–300µA in shutdown. |
| Thermal Resistance θJA | 35°C/W - measured in 7-pin TO-220 package with standard PCB copper area; enables 2A continuous operation without forced air. |
| Switch "On" Voltage | 1.7V at 2A - low saturation voltage minimizes conduction loss in high-current buck stages. |
Pinout & Package
LT1076HVIR#PBF is housed in a 7-lead plastic TO-220 package (T7) with tab connected to GND. The package provides mechanical robustness and thermal performance suitable for industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - 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. |
| 2 - VSW | Switch collector output | Swings up to 45V below GND; drives external inductor/diode; requires careful layout to minimize ringing. |
| 3 - GND | Power and signal reference | Internal reference tied to this pin; must connect directly to low-current output return path to avoid load regulation error. |
| 4 - VC | Error amplifier output | Drives external compensation network (RC/CC); asymmetrical ±140µA/1.1mA sink-source capability reduces startup overshoot. |
| 5 - FB/SENSE | Inverting input of error amplifier | Compares output divider voltage against 2.21V internal reference; used for frequency downshifting below 1.3V. |
| 6 - ILIM | Current limit programming | Internally biased at 4.5V when open; external resistor to GND sets lower current limit (e.g., 7kΩ ≈ 1.2A). |
| 7 - SHDN | Shutdown control | Pull ≥2.45V to enable; ≤0.3V for full micropower shutdown; 10µA internal pull-up enables simple RC delay start. |
Key Features
| Feature | Design Value |
|---|---|
| Analog multiplier feedback | Eliminates input-voltage dependence in loop gain, enabling stable regulation across 8–60V input range without recompensation. |
| Programmable current limit | External resistor on ILIM pin allows precise setting from 0A to 2.6A, supporting diverse output current requirements without redesign. |
| Frequency downshifting | Automatically reduces switching frequency from 100kHz to 20kHz as FB falls below 1.3V, maintaining tight current control during short-circuit events. |
| Micropower shutdown | Reduces total supply current to <300µA while preserving fast wake-up; SHDN pin supports undervoltage lockout and soft-start via RC networks. |
| High-voltage switch rating | Supports 45V swing below GND (HV version), enabling reliable operation in tapped-inductor buck converters delivering 10A at 5V. |
Applications
| Industrial DC-DC Power Supply | Automotive Battery Converter |
|---|---|
Use Scenario: Converting 24V truck battery to regulated 5V/2A for infotainment control modules in harsh vibration and temperature environments. IC Role / Device Role / Timing Role: Primary buck regulator IC providing isolated, ripple-free 5V rail with built-in overcurrent and thermal protection. Use Value: 60V max input withstands load-dump transients; 35°C/W θJA enables convection-cooled operation; SHDN pin supports ignition-controlled enable/disable. | Use Scenario: Generating –5V at 1A from 12V vehicle battery for sensor biasing in emission control systems. IC Role / Device Role / Timing Role: Positive-to-negative converter IC using inverting topology with fixed 100kHz switching for predictable EMI profile. Use Value: 45V VSW swing below GND ensures safe operation during cold-crank (5.5V min); programmable ILIM prevents fuse blow during sensor shorts. |
| Programmable Lab Power Supply | Industrial Motor Drive Auxiliary Rail |
Use Scenario: Adjustable 3–30V/2A bench supply with digital voltage setpoint and current limit via front-panel controls. IC Role / Device Role / Timing Role: Core voltage-mode buck controller IC accepting DAC-generated FB reference and microcontroller-driven ILIM/SHDN signals. Use Value: Wide 2.5–50V output range covers common lab needs; ILIM pin accepts analog voltage for smooth current limit adjustment. | Use Scenario: Providing isolated 15V/1A gate drive supply for IGBTs in variable-frequency motor drives powered from 48V DC bus. IC Role / Device Role / Timing Role: Secondary buck converter IC generating clean auxiliary rail with high PSRR against noisy main bus. Use Value: 100kHz fixed frequency simplifies EMI filter design; analog multiplier feedback rejects bus ripple, improving gate drive stability. |
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, 2A synchronous buck, 3mm × 4mm MSOP; no ILIM/SHDN pins; requires external compensation. | Higher efficiency (>92%), smaller footprint, but lacks programmable current limit and HV swing capability. | Select for space-constrained, efficiency-critical designs where 60V input and tapped-inductor support are not required. |
| LM5164QPWPRQ1 | 100V max input, 0.6A nonsynchronous buck, 1.5MHz switching; integrated bootstrap diode; AEC-Q100 qualified. | Higher input voltage rating and automotive qualification, but lower current and no analog multiplier for line regulation. | Select for automotive applications requiring >60V input or formal qualification, accepting reduced current and simplified loop dynamics. |
Compared with LTC3632EMSE#PBF and LM5164QPWPRQ1, LT1076HVIR#PBF uniquely combines 60V input, 2.6A current limit, analog multiplier-based line regulation, and 45V below-ground switch swing-making it irreplaceable for ruggedized, high-current, multi-topology industrial power conversion where programmability and transient immunity are critical.
Availability
LT1076HVIR#PBF is available at Aetrix Electronics and suitable for industrial DC-DC power supplies, automotive battery converters, and programmable lab power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1076HVIR#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1076HVIR#PBF belongs to Linear's legacy monolithic switching regulator product line, designed specifically for rugged industrial and transportation power systems demanding wide input range, programmable protection, and multi-topology flexibility.
FAQ
What is the maximum input voltage rating for LT1076HVIR#PBF?
The LT1076HVIR#PBF has an absolute maximum input voltage rating of 64V, with guaranteed operation up to 60V. This HV rating distinguishes it from the standard LT1076 (45V max), making it suitable for 48V industrial systems and automotive applications subject to load-dump transients. Always observe the 64V switch-to-input voltage limit specified in the Absolute Maximum Ratings table.
How does the LT1076HVIR#PBF implement current limiting?
The LT1076HVIR#PBF uses internal pulse-by-pulse current limiting with ≈600ns fault detection latency. Current limit is factory-set to 2.6A when the ILIM pin is left open (self-clamped at ~4.5V). Connecting an external resistor from ILIM to GND lowers the trip point linearly - e.g., 7kΩ yields ~1.2A - enabling precise adaptation to system-level fuse or MOSFET SOA requirements without changing the LT1076HVIR#PBF layout.
Can LT1076HVIR#PBF be used in a positive-to-negative converter configuration?
Yes, the LT1076HVIR#PBF supports positive-to-negative conversion due to its ability to swing the VSW pin up to 45V below GND. In this inverting buck-boost topology, the IC regulates the magnitude of the negative output (e.g., –5V) while referencing its internal 2.21V bandgap to GND. Application Note AN44 provides verified schematics and component values for stable –5V/1A operation from 12V input using LT1076HVIR#PBF.
What is the purpose of the SHDN pin on LT1076HVIR#PBF?
The SHDN pin on LT1076HVIR#PBF provides dual-mode control: pulling it to ≥2.45V enables normal operation, while pulling it to ≤0.3V places the device in micropower shutdown (<300µA total current). Between these thresholds, it forces zero duty cycle (output disabled) without full shutdown. This enables flexible system-level functions including undervoltage lockout (via resistor divider), delayed startup (with RC network), and soft-start sequencing - all without external logic.
Does LT1076HVIR#PBF require external compensation components?
Yes, LT1076HVIR#PBF requires external compensation via the VC pin. A series RC network (typically 10kΩ + 100nF) from VC to GND is mandatory for stable loop operation across input/output conditions. The error amplifier's transconductance (≈5000µmho) and asymmetric slew rates (140µA source / 1.1mA sink) demand proper pole-zero placement; omitting or mis-sizing these components causes oscillation or poor transient response in the LT1076HVIR#PBF circuit.
LT1076HVIR#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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1076HVIR#PBF FAQ
1.How can I place an order for LT1076HVIR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1076HVIR#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 LT1076HVIR#PBF reliable?
The price and inventory of LT1076HVIR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1076HVIR#PBF is usually 5 days.
3.What payment methods are accepted for LT1076HVIR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1076HVIR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1076HVIR#PBF?
LT1076HVIR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1076HVIR#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 LT1076HVIR#PBF?
For technical support, including LT1076HVIR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1076HVIR#PBF requirements.
6.How does Aetrix verify that LT1076HVIR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1076HVIR#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 LT1076HVIR#PBF meets industry standards.
7.What is the process for return or replacement of LT1076HVIR#PBF?
All LT1076HVIR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1076HVIR#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 LT1076HVIR#PBF part is unused and in its original packaging.
Return procedure for LT1076HVIR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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