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Analog Devices Inc. LT1374HVIR#TRPBF
- Part No.:
- LT1374HVIR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374HVIR#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,479
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Product details
Overview
LT1374HVIR#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage 500kHz monolithic buck switching regulator with integrated 4.5A NPN power switch, 32V maximum input voltage rating, and fixed 5V output. It employs current-mode control, cycle-by-cycle current limiting, and BOOST-pin-assisted saturation for 0.07Ω effective switch resistance. Designed for compact DC/DC conversion in battery-powered industrial systems requiring stable 5V at up to 4.25A.
For engineers reviewing the LT1374HVIR#TRPBF datasheet, LT1374HVIR#TRPBF pinout, LT1374HVIR#TRPBF application, or LT1374HVIR#TRPBF equivalent, key selection considerations include its 32V input capability, thermal shutdown and short-circuit protection, exposed-pad TSSOP-16 package for enhanced thermal performance, and compatibility with standard surface-mount inductors down to 1.8µH.
Technical Context
The LT1374HVIR#TRPBF implements constant-frequency current-mode topology with internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the VC pin. Its bipolar NPN switch is driven via BOOST pin to achieve saturation-reducing conduction loss versus conventional non-saturated designs.
It integrates undervoltage lockout (2.38V on SHDN), dual-threshold shutdown (0.4V full shutdown), and frequency foldback below 1V FB/SENSE voltage. The SENSE pin (not FB) is used for fixed 5V operation, with 4.94–5.06V regulation accuracy and ±0.03%/V line regulation over 5–32V input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - supports wide-input industrial and battery-derived rails including 24V nominal systems. |
| Output Voltage | Fixed 5V ±1.2% - internally trimmed SENSE reference enables precise regulation without external resistors. |
| Max Output Current | 4.25A at VOUT=5V, VIN=10V, L=5µH - limited by 4.5A switch peak current and duty-cycle-dependent derating. |
| Switching Frequency | 500kHz ±8% - enables use of small inductors (e.g., 1.8µH) and reduces EMI fundamental frequency. |
| Switch On Resistance | 0.07Ω typical - achieved via BOOST-pin drive, reducing conduction loss and improving efficiency >89% at full load. |
| Shutdown Current | 30µA max at VIN ≤ 32V - ensures ultra-low quiescent drain during system sleep or standby modes. |
| Thermal Protection | Internal thermal shutdown - prevents damage under sustained overload or poor PCB heatsinking. |
Pinout & Package
LT1374HVIR#TRPBF is housed in a 16-pin exposed-pad TSSOP package (FE16), optimized for thermal dissipation in high-current applications. The exposed pad must be soldered to a PCB ground plane for θJA ≈ 30°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Multiple GND pins reduce impedance; must connect all to low-inductance ground plane to maintain regulation accuracy and minimize EMI. |
| VIN (Pins 3, 4) | Main input supply connection | Dual VIN pins require short parallel routing on PCB to minimize trace inductance and suppress switching-node voltage spikes. |
| BOOST (Pin 5) | Switch driver boost supply | Connects to external capacitor-diode network to generate ~VIN+5V drive voltage; enables NPN saturation and low RCE(sat). |
| FB/SENSE (Pin 6) | Output voltage sense input | Configured as SENSE for fixed 5V output; connects directly to regulated 5V rail; provides feedback for error amplifier and foldback protection. |
| VSW (Pins 10, 11) | Switch emitter node | Dual VSW pins carry high di/dt switch current; must be routed with minimal loop area and connected to catch diode cathode and inductor. |
| SYNC/SHDN (Pin 12) | Multi-function logic input | On LT1374HVIR#TRPBF, this pin functions as SHDN (shutdown); pulled low disables switching and reduces IQ to 30µA. |
| VC (Pin 13) | Error amplifier output / current limit setpoint | Provides access to control loop; used for compensation, current clamping, or override; swings 0.9–2.1V under normal operation. |
| BIAS (Pin 14) | Internal bias supply input | Accepts external 3–7V source (e.g., regulated 5V output); improves efficiency by shifting bias current from VIN to BIAS at high input voltages. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input support | 32V absolute max input enables direct interface with 24V industrial buses and wide-range battery packs. |
| Integrated cycle-by-cycle current limiting | Hardware-based protection triggers per-switch cycle at 4.5A peak, preventing MOSFET or inductor failure during overload. |
| Frequency foldback under fault | Reduces switching frequency 5:1 when SENSE voltage drops below 1V, limiting power dissipation during short-circuit conditions. |
| BOOST-pin-assisted saturation | External BOOST capacitor raises drive voltage above VIN, enabling NPN switch saturation and minimizing conduction loss. |
| Exposed-pad thermal package | TSSOP-16 FE16 package with soldered exposed pad achieves θJA ≈ 30°C/W - critical for sustaining 4.25A continuous output. |
Applications
| Industrial Power Supplies | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Compact 24V-to-5V conversion in programmable logic controller (PLC) I/O modules with space-constrained PCB layout. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V to microcontroller, sensors, and digital isolators. Use Value: 32V input rating accommodates 24V ±20% industrial bus variation; 500kHz switching allows <2mm-height inductor integration. |
Use Scenario: Portable handheld multimeter with Li-ion battery (8.4–12.6V) powering 5V analog front-end and display controller. IC Role / Device Role / Timing Role: Main step-down converter providing stable 5V rail across full battery discharge curve. Use Value: 30µA shutdown current extends battery life in sleep mode; current-mode control ensures fast transient response to digitizer sampling bursts. |
| Medical Point-of-Care Devices | Automated Test Equipment (ATE) |
Use Scenario: Battery-backed portable ultrasound probe requiring low-noise, thermally robust 5V supply for ADC and FPGA. IC Role / Device Role / Timing Role: Isolated 5V power stage downstream of primary DC/DC; operates in continuous conduction mode. Use Value: Exposed-pad TSSOP-16 enables direct thermal coupling to metal enclosure; fixed 5V SENSE eliminates resistor tolerance errors affecting measurement accuracy. |
Use Scenario: Rack-mounted ATE module converting 28V aircraft bus to 5V for digital pattern generators and level shifters. IC Role / Device Role / Timing Role: High-reliability buck regulator with thermal shutdown and short-circuit protection for mission-critical test sequencing. Use Value: Dual GND/VIN/VSW pins reduce parasitic inductance and EMI emissions in dense backplane environments; 32V rating covers MIL-STD-704 transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | 42V input, 3.5A, 500kHz, integrated MOSFETs, requires external compensation. | Higher integration (no external diode), lower max current; better suited for space-constrained designs where efficiency >90% is prioritized over raw current capability. | Select LTC3631EMSE#PBF when board area is critical and 3.5A output suffices; avoid if 4.25A continuous load or 32V+ transient immunity is required. |
| TPS54331DR | 28V input, 3A, 570kHz, integrated FET, adjustable output only, no BOOST pin. | No fixed-5V option; lacks BOOST-assisted saturation - higher RDS(on) limits efficiency at high current; simpler BOM but lower thermal margin. | Choose TPS54331DR for cost-sensitive, lower-current (<3A) applications where TI's WEBENCH support and availability outweigh need for 32V rating or 4.25A capability. |
Compared with LTC3631EMSE#PBF and TPS54331DR, the LT1374HVIR#TRPBF delivers higher output current (4.25A vs. 3.5A/3A), superior 32V input resilience, and BOOST-enabled saturation for lower conduction loss - making it optimal for thermally demanding, high-current industrial buck stages where fixed 5V output simplifies design validation.
Availability
LT1374HVIR#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered test equipment, medical point-of-care devices, and automated test equipment requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LT1374HVIR#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, documentation, and manufacturing continuity for the LT® series. Linear pioneered high-performance analog ICs with emphasis on precision, speed, and ruggedness.
The LT1374HVIR#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for industrial, automotive, and medical applications demanding wide-input operation, robust protection, and reliable 5V output without external feedback resistors.
FAQ
What is the maximum input voltage rating for the LT1374HVIR#TRPBF?
The LT1374HVIR#TRPBF has an absolute maximum input voltage rating of 32V, distinguishing it from the standard LT1374 (25V). This 32V rating enables direct operation from 24V industrial buses and wide-range battery inputs, and is validated across temperature and process corners per Linear Technology's Electrical Characteristics table.
Does the LT1374HVIR#TRPBF require external feedback resistors for 5V output?
No. The LT1374HVIR#TRPBF is the fixed 5V version - it uses an internal resistor divider and the FB pin functions as SENSE, connecting directly to the output. This eliminates resistor tolerance errors and saves board space, unlike adjustable variants such as LT1374HVIR-5#TRPBF which retain the FB pin.
What package type does the LT1374HVIR#TRPBF use, and why is thermal design critical?
The LT1374HVIR#TRPBF uses the 16-pin exposed-pad TSSOP (FE16) package. Its thermal performance depends critically on soldering the exposed pad to a large PCB ground plane - achieving θJA ≈ 30°C/W. Without proper pad connection, junction temperature can exceed 125°C under 4.25A load, triggering thermal shutdown.
How does the BOOST pin function in the LT1374HVIR#TRPBF?
The BOOST pin on the LT1374HVIR#TRPBF accepts a capacitor-diode charge pump network to generate a drive voltage ~5V above VIN. This elevated voltage saturates the internal NPN switch, reducing effective on-resistance to 0.07Ω and increasing efficiency beyond 89% - a key differentiator from non-boosted buck regulators.
Is the LT1374HVIR#TRPBF pin-compatible with other LT1374 variants?
No. The LT1374HVIR#TRPBF uses the 16-pin FE16 TSSOP package with dual VIN, dual VSW, and dedicated BIAS pin - differing from 7-pin DD, SO-8, or TO-220 variants. Pin mapping is unique to FE16; migration requires PCB redesign, though functional behavior (5V fixed output, 32V input) remains consistent across HV-grade parts.
LT1374HVIR#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-Down
- Output Configuration:
- Positive
- Topology:
- Buck, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 32V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 27.52V
- Current - Output:
- 4.5A (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1374HVIR#TRPBF FAQ
1.How can I place an order for LT1374HVIR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVIR#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 LT1374HVIR#TRPBF reliable?
The price and inventory of LT1374HVIR#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVIR#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374HVIR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVIR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVIR#TRPBF?
LT1374HVIR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVIR#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 LT1374HVIR#TRPBF?
For technical support, including LT1374HVIR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVIR#TRPBF requirements.
6.How does Aetrix verify that LT1374HVIR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVIR#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 LT1374HVIR#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374HVIR#TRPBF?
All LT1374HVIR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVIR#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 LT1374HVIR#TRPBF part is unused and in its original packaging.
Return procedure for LT1374HVIR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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