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Analog Devices Inc. LT1374HVCS8#TRPBF
- Part No.:
- LT1374HVCS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374HVCS8#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,494
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Product details
Overview
LT1374HVCS8#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, fixed 5V output, and SO-8 package. It delivers up to 4.25A at 5V with cycle-by-cycle current limiting, thermal shutdown, and 0.07Ω typical switch on-resistance. Used in battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1374HVCS8#TRPBF datasheet, LT1374HVCS8#TRPBF pinout, LT1374HVCS8#TRPBF application, or LT1374HVCS8#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts for 5V buck conversion in industrial and portable systems.
Technical Context
The LT1374HVCS8#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops - one for output voltage regulation via the SENSE pin (5.0V ±1.2%), another for cycle-by-cycle peak current limiting (4.5A typical). Its bipolar NPN switch uses BOOST-pin-driven saturation to achieve low conduction loss (0.07Ω), enabling >89% efficiency at 5V/2A with VIN = 10V.
It features undervoltage lockout (2.38V on SHDN), micropower shutdown (20µA), and optional synchronization (580kHz–1MHz range via SYNC pin). The BIAS pin supports efficiency optimization by sourcing internal bias current from the regulated output when VOUT ≥ 3.3V, reducing VIN supply current by >10% at VIN = 20V/VOUT = 5V/IOUT = 25mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - supports wide-range industrial and automotive inputs; minimum start-up voltage is 5.5V. |
| Output Voltage | Fixed 5.0V ±1.2% - eliminates external feedback resistors; SENSE pin connects directly to output for precision regulation. |
| Switch Current Limit | 4.5A typical - sets absolute maximum load capability; derates to 3.7A at 80% duty cycle due to slope compensation. |
| Switching Frequency | 500kHz ±8% - enables use of small 5µH inductors (vs. 10–20µH at 100kHz); reduces EMI fundamental but increases switching loss. |
| Efficiency @ 5V/2A | 89% typical with VIN = 10V - achieved via BOOST-driven switch saturation and BIAS pin optimization; drops to ~82% at VIN = 25V. |
| Shutdown Current | 20µA max - ensures ultra-low quiescent drain during system sleep; triggered by SHDN pin < 0.4V. |
| Thermal Shutdown | Activated at TJ = 125°C - protects device under overload or poor PCB heatsinking; auto-recovery after cooldown. |
Pinout & Package
LT1374HVCS8#TRPBF is housed in an 8-lead plastic SO-8 package (S8) with fused ground pin (FGND) for improved thermal performance (θJA = 80°C/W with FGND connected to ground plane). Exposed pad not present - standard SO-8 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power collector | Connects to input source (6–32V); powers internal circuitry; requires local 100µF solid tantalum bypass close to pin. |
| BOOST | Switch drive boost node | Drives internal NPN base above VIN via external capacitor/diode; must be ≥VIN + 2.3V to ensure full switch saturation. |
| FGND | Fused ground reference | Primary GND connection; must be soldered to large copper area for thermal and noise control; referenced by SENSE and VC. |
| VSW | Switch emitter output | Drives inductor; swings from ~0V to VIN during operation; requires catch diode (e.g., MBRS330T3) tied to GND. |
| VC | Error amplifier output | Controls peak switch current; used for loop compensation (capacitor/resistor from VC to FGND); clamps at 2.1V. |
| BIAS | Internal bias supply input | Accepts external 3–7V (e.g., VOUT) to reduce VIN current draw; improves efficiency at high VIN/light loads. |
| SYNC | Oscillator synchronization input | Logic-level input (1.5–2.2V threshold); accepts 580kHz–1MHz external clock; replaces SHDN function on -SYNC variants. |
| SENSE | Output voltage sense input | Replaces FB pin on fixed-output versions; connected directly to 5V output; regulates to 5.0V ±1.2% (4.94–5.06V). |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input support | 32V max VIN enables direct operation from 24V industrial rails or 28V avionics buses without pre-regulation. |
| Integrated 4.5A NPN switch | Eliminates external MOSFET and driver; reduces BOM count and layout complexity while maintaining 0.07Ω RON. |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation components. |
| BOOST-driven saturation | Reduces switch VCE(sat) to ~0.3V at 4.5A, improving efficiency over conventional bipolar designs by >14 percentage points. |
| BIAS pin efficiency boost | Shifts internal bias current from VIN to VOUT, cutting total supply current by >10% at VIN = 20V/VOUT = 5V/IOUT = 25mA. |
Applications
| Battery-Powered Portable Systems | Industrial Distributed Power |
|---|---|
Use Scenario: Power management in handheld test equipment with 12–28V Li-ion or lead-acid battery input. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering up to 4.25A to microcontroller, display, and analog front-end. Use Value: 32V input rating avoids need for input pre-regulator; 20µA shutdown current extends battery life during standby. |
Use Scenario: Local 5V rail generation in PLC I/O modules powered from 24V DC field bus. IC Role / Device Role / Timing Role: Point-of-load regulator supplying FPGA core logic and interface ICs. Use Value: Thermal shutdown and cycle-by-cycle current limiting protect against short-circuited field wiring or sensor faults. |
| Automotive Aftermarket Electronics | Medical Portable Diagnostic Devices |
Use Scenario: Power supply in vehicle-mounted data loggers interfacing with CAN bus and GPS modules. IC Role / Device Role / Timing Role: Main 5V supply handling cold-crank (6V) to load-dump (32V) transients per ISO 7637-2. Use Value: 32V absolute max rating and robust UVLO (2.38V) ensure reliable startup and operation across automotive voltage extremes. |
Use Scenario: Compact ultrasound probe with embedded processing requiring clean, low-noise 5V for ADC and RF front-end. IC Role / Device Role / Timing Role: Regulated 5V source feeding precision analog signal chain and low-power ARM Cortex-M core. Use Value: Fixed 5V output eliminates resistor tolerance error; BOOST-saturation minimizes thermal rise in sealed enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5V buck conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4A synchronous buck, 3.6–36V input, 5V fixed, 95% efficiency, 2.25MHz switching, QFN-12 package. | Higher efficiency and frequency enable smaller magnetics; no BOOST pin or BIAS option; requires external MOSFET gate drivers. | Choose for space-constrained designs needing >90% efficiency and minimal inductor size; avoid if BOOST-based saturation or BIAS-driven efficiency gain is required. |
| MP2338GJ-Z | 4A synchronous buck, 4.5–36V input, 5V fixed, 93% efficiency, 500kHz, TSOT23-8 package; no BIAS or SYNC pins. | Smaller footprint and lower cost; lacks BIAS pin for efficiency tuning and SYNC for EMI reduction; no thermal shutdown flag. | Choose for cost-sensitive, high-volume consumer applications where BIAS optimization and precise synchronization are unnecessary. |
Compared with LTC3605EDE#TRPBF and MP2338GJ-Z, the LT1374HVCS8#TRPBF uniquely combines high-voltage tolerance (32V), BOOST-driven bipolar saturation for ruggedness, BIAS pin flexibility, and proven thermal protection - making it preferred for industrial and automotive environments where reliability trumps raw efficiency or miniaturization.
Availability
LT1374HVCS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable systems, industrial distributed power supplies, automotive aftermarket electronics, and medical portable diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1374HVCS8#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 support for the LT® product line, known for high-performance analog and power management ICs targeting demanding industrial, automotive, and aerospace applications.
The LT1374HVCS8#TRPBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for robust, efficient DC/DC conversion in systems exposed to wide-input-voltage transients and harsh thermal environments.
FAQ
What is the maximum input voltage rating for the LT1374HVCS8#TRPBF?
The LT1374HVCS8#TRPBF has a maximum input voltage rating of 32V, as specified in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1374 (25V max) and enables direct operation from 24V industrial rails or automotive load-dump conditions. Operation beyond 32V risks permanent damage; the BOOST pin voltage must also remain ≤38V.
Does the LT1374HVCS8#TRPBF require an external feedback resistor network?
No, the LT1374HVCS8#TRPBF does not require external feedback resistors because it is the fixed 5V output variant (-5 suffix). Its SENSE pin is internally connected to a precision 2.42V reference and calibrated divider, regulating output to 5.0V ±1.2%. External resistors are only needed for adjustable-output versions like LT1374HVCS8#TRPBF-ADJ.
How does the BOOST pin function in the LT1374HVCS8#TRPBF?
The BOOST pin on the LT1374HVCS8#TRPBF supplies elevated base drive to the internal NPN power switch, enabling saturation and minimizing VCE(sat). It must be biased ≥2.3V above VIN via an external capacitor and diode (e.g., CMDSH3). Without proper BOOST voltage, switch conduction loss rises sharply, degrading efficiency from >89% to ~75%.
Can the LT1374HVCS8#TRPBF be synchronized to an external clock?
Yes, the LT1374HVCS8#TRPBF supports synchronization via its SYNC pin, which accepts logic-level signals from 580kHz to 1MHz with 10–90% duty cycle. This feature allows EMI reduction through frequency alignment and avoids beat frequencies in multi-rail systems. Note: the standard LT1374HVCS8#TRPBF includes SYNC; -SYNC variants replace SHDN with SYNC functionality.
What thermal protection features does the LT1374HVCS8#TRPBF include?
The LT1374HVCS8#TRPBF integrates full-cycle thermal shutdown that activates at TJ = 125°C and automatically recovers once junction temperature falls below the hysteresis threshold. It also includes cycle-by-cycle current limiting (4.5A typical) and undervoltage lockout (2.38V on SHDN) to prevent operation under unsafe bias conditions - all critical for reliability in enclosed or high-ambient-temperature deployments.
LT1374HVCS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1374HVCS8#TRPBF FAQ
1.How can I place an order for LT1374HVCS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVCS8#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 LT1374HVCS8#TRPBF reliable?
The price and inventory of LT1374HVCS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVCS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374HVCS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVCS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVCS8#TRPBF?
LT1374HVCS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVCS8#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 LT1374HVCS8#TRPBF?
For technical support, including LT1374HVCS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVCS8#TRPBF requirements.
6.How does Aetrix verify that LT1374HVCS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVCS8#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 LT1374HVCS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374HVCS8#TRPBF?
All LT1374HVCS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVCS8#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 LT1374HVCS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1374HVCS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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