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Analog Devices Inc. LT1374HVIFE#TRPBF
- Part No.:
- LT1374HVIFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1374HVIFE#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,181
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Product details
Overview
LT1374HVIFE#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 uses current-mode control for fast transient response, features cycle-by-cycle current limiting, 20µA shutdown current, and operates in a thermally enhanced 16-pin TSSOP package with exposed pad. It is designed for battery-powered systems requiring compact, efficient DC/DC conversion from 6V–25V inputs to stable 5V/4.25A outputs.
For engineers reviewing the LT1374HVIFE#TRPBF datasheet, LT1374HVIFE#TRPBF pinout, LT1374HVIFE#TRPBF application, or LT1374HVIFE#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details - all specific to the LT1374HVIFE#TRPBF variant with HV rating, fixed 5V output, FE16 package, and tape-and-reel delivery.
Technical Context
The LT1374HVIFE#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops: one error amplifier setting peak switch current via the VC pin, and a current-sense amplifier monitoring switch current on a cycle-by-cycle basis. Its bipolar NPN switch achieves 0.07Ω effective on-resistance via BOOST pin drive, enabling >89% efficiency at full load.
It integrates undervoltage lockout (2.38V on SHDN), micropower shutdown (0.4V threshold), and foldback protection: switching frequency drops below 1V FB/SENSE voltage and current limit reduces below 1.7V, both critical for short-circuit survival. The SENSE pin (not FB) is used for fixed 5V operation and directly connects to the regulated output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 25V (32V absolute max); supports wide-input industrial/battery systems without external pre-regulation. |
| Output Voltage | Fixed 5V ±1.2% (4.94–5.06V); eliminates external resistor divider and improves accuracy vs adjustable variants. |
| Max Output Current | 4.25A at VOUT=5V, VIN=10V, L=5µH; derates with higher VIN or smaller inductors due to duty-cycle–limited switch current. |
| Switching Frequency | 500kHz ±8% (460–540kHz); enables use of small 1.8–5µH inductors and reduces EMI fundamental frequency. |
| Efficiency | 95% at 5V/2A, VIN=10V; maintained across load range by BIAS pin optimization and BOOST-driven saturation. |
| Shutdown Current | 20µA typical (≤75µA over temp); enables multi-week battery standby in portable equipment. |
| Thermal Performance | θJA = 30°C/W with 0.5 sq in copper; exposed pad requires soldered ground connection for safe 4.25A operation. |
Pinout & Package
LT1374HVIFE#TRPBF is housed in a 16-pin thermally enhanced TSSOP (FE16) package with exposed thermal pad. Pin 1 is top-left corner (dot-marked), pins numbered counter-clockwise; both VIN pins (3,4) and both VSW pins (10,11) must be shorted externally on PCB. GND pins (1,8,9,16) require low-impedance connection to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,8,9,16) | Power and signal reference | Must connect all four pins to solid ground plane; separates load return path from noisy switch node to preserve regulation and reduce EMI. |
| VIN (3,4) | Input power collector | Both pins carry full input current; short together and place 100µF tantalum + 0.27µF ceramic close to minimize dI/dt spikes. |
| BOOST (5) | Switch driver boost supply | Connects to VIN+5V via external diode/capacitor; enables NPN saturation, reducing switch loss to 0.07Ω equivalent. |
| FB/SENSE (6) | Fixed-output voltage sense | Direct connection to 5V output; not a feedback divider input-used for foldback protection and UVLO monitoring. |
| SYNC (12) | External clock synchronization | Accepts 10–90% duty-cycle logic signal; shifts frequency from 580kHz to 1MHz; replaces SHDN function in -SYNC variants. |
| SHDN (13) | Enable/shutdown control | 2.38V UVLO threshold disables switching; 0.4V forces micropower mode; drives 500nA bias current when active. |
| VC (14) | Error amplifier output / current limit setpoint | 1V–2V analog control voltage; sets peak switch current; can be clamped to override regulation or force shutdown. |
| BIAS (15) | Internal circuitry power source | Connect to 5V output to improve efficiency at high VIN; reduces total supply current by shifting bias load from VIN to VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent loop stability without external compensation components beyond standard RC network on VC pin. |
| Integrated BOOST drive | Eliminates need for external gate driver; sustains 0.07Ω switch RCE(sat) up to 4.5A, improving efficiency by ≥14% vs conventional bipolar designs. |
| SENSE-based foldback protection | Reduces switching frequency and peak current limit automatically during short-circuit or start-up, limiting IC and external component power dissipation. |
| Exposed-pad TSSOP (FE16) | Provides 30°C/W junction-to-ambient thermal resistance when soldered to 0.5 sq in copper; enables continuous 4.25A operation without heatsink. |
| BIAS pin efficiency optimization | When tied to 5V output, shifts ~4mA bias current from VIN to VOUT, increasing full-load efficiency by >10% at VIN=20V/VOUT=5V. |
Applications
| Battery-Powered Portable Computers | Distributed Power Systems |
|---|---|
Use Scenario: Main 5V rail generation in ruggedized tablets operating from 7.2V–25.2V Li-ion packs with variable cell count. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering regulated 5V/4.25A to SoC, USB, and peripheral subsystems. Use Value: 20µA shutdown current extends battery life during sleep; BOOST-enabled saturation maintains >90% efficiency across 3–4 cell input range. |
Use Scenario: Local 5V point-of-load supply in telecom shelf systems with 12V or 24V backplane distribution. IC Role / Device Role / Timing Role: Compact, high-current POL regulator replacing discrete buck controllers + MOSFETs in space-constrained modules. Use Value: FE16 package fits high-density layouts; 500kHz switching allows ≤5µH inductor, reducing board area by 40% vs 100kHz alternatives. |
| Battery Chargers (USB PD / Legacy) | Industrial Control & Automation |
Use Scenario: Secondary-side 5V supply in multi-port chargers where primary-side controller regulates 9–20V bus. IC Role / Device Role / Timing Role: Fixed-output buck stage converting intermediate bus to clean 5V for microcontroller, display, and communication ICs. Use Value: SENSE pin eliminates resistor tolerance errors; foldback protection survives accidental 0Ω load during hot-plug events. |
Use Scenario: Powering PLC I/O modules, sensors, and fieldbus transceivers from 12–24V industrial rails subject to load dump transients. IC Role / Device Role / Timing Role: Robust 5V regulator with 32V abs-max input handling surge conditions without external TVS clamping. Use Value: 2.38V UVLO prevents erratic startup during brownout; exposed pad ensures thermal reliability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EFE#PBF | External MOSFET controller (no integrated switch); 4–36V input; requires external gate drivers and power FETs. | Suitable for higher-current (>6A) or higher-efficiency (>94%) designs where thermal management justifies added complexity. | Select LTC3866EFE#PBF only if output current exceeds 4.25A or if synchronous rectification is required for >92% efficiency at light loads. |
| TPS54560QPWPRQ1 | Monolithic 60V-input buck; 5A switch; adjustable output; 3.5–60V input; no BOOST pin or BIAS pin functionality. | Preferred for automotive 12V/24V systems needing AEC-Q100 qualification and wider input range, but lacks foldback protection and BIAS efficiency boost. | Choose TPS54560QPWPRQ1 for automotive-grade designs requiring 60V surge tolerance and AEC-Q100 compliance, accepting trade-offs in short-circuit robustness and light-load efficiency. |
Compared with LT1374HVIFE#TRPBF, LTC3866EFE#PBF offers scalability beyond 4.25A but adds layout complexity and cost, while TPS54560QPWPRQ1 provides automotive qualification and higher input voltage margin but sacrifices the integrated BOOST/BIAS efficiency optimizations and SENSE-based foldback unique to the LT1374HV family.
Availability
LT1374HVIFE#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable computers, distributed power systems, and industrial control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LT1374HVIFE#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 and power management ICs with emphasis on precision, speed, and integration.
The LT1374HVIFE#TRPBF belongs to Linear's legacy monolithic buck regulator product line, engineered specifically for high-efficiency, high-current DC/DC conversion in space- and thermal-constrained environments where simplicity, reliability, and protection integrity are critical.
FAQ
What is the maximum input voltage rating for the LT1374HVIFE#TRPBF?
The LT1374HVIFE#TRPBF has a maximum input voltage rating of 32V, distinguishing it from the standard LT1374 (25V). This HV rating allows reliable operation in 24V industrial systems and battery stacks with transient surges. The absolute maximum rating is strictly limited to 32V - exceeding this risks permanent damage. Operation between 6V and 25V is recommended for normal regulation, with 32V reserved for short-duration transients only.
Does the LT1374HVIFE#TRPBF require an external feedback resistor divider?
No, the LT1374HVIFE#TRPBF does not require an external feedback resistor divider because it is the fixed 5V output variant. Pin 6 is labeled FB/SENSE but functions exclusively as a SENSE pin - it must be connected directly to the regulated 5V output node. Using a resistor divider would disrupt the internal 5V reference and void the guaranteed output accuracy of ±1.2% (4.94–5.06V).
How does the BOOST pin function in the LT1374HVIFE#TRPBF?
The BOOST pin in the LT1374HVIFE#TRPBF supplies elevated drive voltage to the base of the internal NPN power switch, enabling deep saturation and achieving an effective on-resistance of 0.07Ω. It requires an external bootstrap capacitor (typically 10nF–100nF) and Schottky diode (e.g., MBRS330T3) connected from VIN to BOOST. Without proper BOOST implementation, switch losses increase significantly, reducing efficiency by up to 14% and risking thermal overload at full load.
Can the LT1374HVIFE#TRPBF be synchronized to an external clock?
Yes, the LT1374HVIFE#TRPBF supports external synchronization via Pin 12 (SYNC), which accepts logic-level signals with 10–90% duty cycle. When driven, it shifts the internal oscillator frequency from its nominal 500kHz to a range of 580kHz–1MHz. This feature enables EMI reduction through frequency dithering or alignment with system clocks - but note that the SHDN pin remains functional and is not replaced by SYNC in this variant (unlike -SYNC suffix parts).
What thermal design considerations apply to the LT1374HVIFE#TRPBF in FE16 package?
The LT1374HVIFE#TRPBF in FE16 package requires the exposed thermal pad (Pin 16) to be soldered to a minimum 0.5 square inch copper area on the PCB for θJA = 30°C/W performance. Without this, junction temperature rise exceeds safe limits at >2A load. Thermal vias (≥6×0.3mm) must connect the pad to inner/ground planes. Layout must separate GND traces from noisy switch nodes to avoid ground bounce affecting regulation accuracy.
LT1374HVIFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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:
- 16-TSSOP-EP
LT1374HVIFE#TRPBF FAQ
1.How can I place an order for LT1374HVIFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVIFE#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 LT1374HVIFE#TRPBF reliable?
The price and inventory of LT1374HVIFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVIFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374HVIFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVIFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVIFE#TRPBF?
LT1374HVIFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVIFE#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 LT1374HVIFE#TRPBF?
For technical support, including LT1374HVIFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVIFE#TRPBF requirements.
6.How does Aetrix verify that LT1374HVIFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVIFE#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 LT1374HVIFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374HVIFE#TRPBF?
All LT1374HVIFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVIFE#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 LT1374HVIFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1374HVIFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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