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Analog Devices Inc. LT1374HVCFE#TRPBF
- Part No.:
- LT1374HVCFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1374HVCFE#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,220
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Product details
Overview
LT1374HVCFE#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 exposed-pad 16-pin TSSOP 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 industrial power supplies requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1374HVCFE#TRPBF datasheet, LT1374HVCFE#TRPBF pinout, LT1374HVCFE#TRPBF application, or LT1374HVCFE#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for production deployment.
Technical Context
The LT1374HVCFE#TRPBF implements constant-frequency current-mode control with internal 500kHz oscillator, enabling fast transient response and stable loop behavior across wide load and input ranges. Its bipolar NPN switch uses BOOST pin-driven saturation to achieve low conduction loss (0.07Ω), while slope compensation prevents subharmonic oscillation above 50% duty cycle.
It integrates undervoltage lockout (2.38V on SHDN), micropower shutdown (20µA), and dual-threshold shutdown logic - one for UVLO standby, another for full current cutoff. The fixed 5V output version replaces FB with SENSE pin tied directly to VOUT, eliminating external feedback resistors and simplifying layout for standard 5V rail generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - supports wide industrial/battery inputs including 24V nominal systems and 28V avionics rails. |
| Output Voltage | Fixed 5V ±1.2% - eliminates feedback resistor network, reduces BOM count, and improves accuracy vs adjustable variants. |
| Max Output Current | 4.25A at VOUT = 5V, VIN = 10V, L = 5µH - validated per Typical Performance Characteristics (Fig. 15). |
| Switch On-Resistance | 0.07Ω (typ) at ISW = 4.5A - enables high efficiency (>89%) by minimizing I²R loss in the integrated NPN switch. |
| Switching Frequency | 500kHz ±8% - allows use of small 1.8–5µH inductors and reduces size of input/output capacitors. |
| Shutdown Current | 20µA (max) at VIN ≤ 32V - ensures ultra-low quiescent drain during system sleep modes. |
| SENSE Pin Voltage | 5.0V ±1.2% - precise internal reference enables accurate regulation without external components. |
| Thermal Shutdown | Active at TJ ≥ 125°C - protects device under overload or poor heatsinking conditions in enclosed environments. |
Pinout & Package
LT1374HVCFE#TRPBF is housed in a 16-pin TSSOP package with exposed thermal pad (FE16), optimized for high-power density and thermal performance in space-constrained PCBs. The exposed pad must be soldered to a ground plane for effective heat dissipation and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Four dedicated GND pins minimize ground impedance; all must connect to low-inductance ground plane to maintain load regulation and reduce EMI. |
| VIN (Pins 3, 4) | Main input supply connection | Dual VIN pins reduce trace inductance and voltage spikes during high dI/dt switching transitions; must be shorted together on PCB. |
| BOOST (Pin 5) | Switch driver boost supply | Requires 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 | Fixed 5V version: SENSE pin connected directly to regulated output; no external divider needed. |
| VSW (Pins 10, 11) | Switch emitter node | Dual VSW pins carry full inductor current; must be shorted on PCB and routed with minimal loop area to limit EMI and voltage overshoot. |
| SYNC (Pin 12) | External oscillator synchronization input | Logic-level compatible (1.5–2.2V threshold); accepts 580kHz–1MHz external clock to eliminate beat frequencies in multi-rail systems. |
| SHDN (Pin 13) | Shutdown control input | Two thresholds: 2.38V for UVLO standby, 0.4V for full micropower shutdown; pulls supply current to 20µA. |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Provides access to internal error amp output; used for frequency compensation, current clamping, or external override. |
| BIAS (Pin 15) | Internal bias supply input | Connect to regulated output (≥3.3V) to improve efficiency at high VIN/light loads by sourcing bias current from VOUT instead of VIN. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Support | 32V max VIN rating enables direct operation from 24V industrial buses and automotive cold-crank transients. |
| Integrated Power Switch | 4.5A rated NPN switch with 0.07Ω RCE(sat) eliminates need for external MOSFET and gate driver, reducing solution size. |
| Current-Mode Control | Enables inherent cycle-by-cycle current limiting, fast transient response, and stable operation with ceramic output capacitors. |
| Thermal Protection | Full-cycle thermal shutdown at 125°C junction temperature prevents damage during sustained overload or poor airflow. |
| Efficiency Optimization | BOOST pin + BIAS pin architecture improves efficiency >10% at VIN = 20V/VOUT = 5V/IOUT = 25mA vs standard bias sourcing. |
| Robust Short-Circuit Handling | Frequency foldback (to ~100kHz) and current limit reduction below 1V FB/SENSE protect IC and external components during output shorts. |
Applications
| Industrial 24V-to-5V Point-of-Load | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: Converting unregulated 24V industrial bus to clean 5V for microcontrollers, sensors, and communication interfaces in PLC modules. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V at up to 4.25A with tight line/load regulation and immunity to input ripple. Use Value: Eliminates need for pre-regulator stages; 32V input rating handles brownouts and surges; exposed-pad TSSOP aids thermal management in sealed enclosures. |
Use Scenario: Powering portable oscilloscopes, multimeters, and handheld analyzers from Li-ion or NiMH battery packs (12–28V). IC Role / Device Role / Timing Role: High-efficiency step-down converter maintaining 5V rail during battery discharge from 28V down to 12V. Use Value: 20µA shutdown current extends battery life in standby; 500kHz switching enables compact 3.3µH inductor and low-profile tantalum output caps. |
| Avionics 28V DC-DC Conversion | Medical Portable Diagnostic Devices |
|
Use Scenario: Generating stable 5V for flight data recorders, cockpit displays, and sensor interfaces in aircraft with 28V nominal systems. IC Role / Device Role / Timing Role: Primary power stage with UVLO (2.38V SHDN threshold) preventing startup until bus stabilizes post-engine start. Use Value: Robust 32V absolute max rating accommodates 100V transients per DO-160; thermal shutdown ensures reliability in high-temp avionics bays. |
Use Scenario: Supplying 5V to FPGA-based imaging processors and analog front-ends in ultrasound or ECG handheld units. IC Role / Device Role / Timing Role: Low-noise, tightly regulated power source with minimized EMI via dual-GND/VSW pins and ground-plane-connected thermal pad. Use Value: Fixed 5V output ensures consistent timing margin for digital logic; current-mode control suppresses noise coupling into sensitive analog signal paths. |
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, 3mm × 4mm MSOP, synchronous rectification, 3.5mA quiescent current | Higher efficiency at light loads due to synchronous topology; lacks BOOST pin and BIAS pin functionality | Choose LTC3631 for higher efficiency in battery-sensitive apps; avoid if BOOST-assisted saturation or BIAS-driven efficiency gain is required. |
| LM5164QPWPRQ1 | 100V input, 0.6A, 1.5MHz, automotive-grade, integrated high-side FET only (requires external sync rectifier) | Designed for harsh automotive environments (AEC-Q100); lower current rating and no integrated low-side switch | Choose LM5164Q1 for 48V+ automotive systems; not suitable as drop-in replacement due to current and integration mismatch. |
Compared with LT1374HVCFE#TRPBF, LTC3631EMSE#PBF offers better light-load efficiency but sacrifices 4.5A capability and BOOST/Bias optimization, while LM5164QPWPRQ1 targets higher input voltages and automotive qualification at the cost of output current and integration level - neither matches the LT1374HVCFE#TRPBF's balance of high-current, high-voltage, and thermally robust monolithic buck performance.
Availability
LT1374HVCFE#TRPBF is available at Aetrix Electronics and suitable for industrial automation, avionics power distribution, and portable test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT1374HVCFE#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, power, and reliability.
The LT1374HVCFE#TRPBF belongs to Linear's monolithic switching regulator family designed for high-efficiency, high-current DC/DC conversion in space- and thermal-constrained industrial and portable systems where integrated power switches and robust protection are essential.
FAQ
What is the maximum input voltage rating for the LT1374HVCFE#TRPBF?
The LT1374HVCFE#TRPBF has an absolute maximum input voltage rating of 32V, confirmed in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1374 (25V max) and enables reliable operation in 24V industrial and 28V avionics systems with transient headroom. Operation above 32V risks permanent damage.
Does the LT1374HVCFE#TRPBF require external feedback resistors?
No - the LT1374HVCFE#TRPBF is the fixed 5V output variant, so the FB pin is implemented as a SENSE pin internally connected to the 5V output. No external resistor divider is needed, simplifying layout and improving regulation accuracy versus adjustable versions that depend on resistor tolerance and bias current errors.
How does the BOOST pin function in the LT1374HVCFE#TRPBF?
The BOOST pin on the LT1374HVCFE#TRPBF provides a boosted gate drive voltage (~VIN + 5V) to saturate the internal NPN power switch, reducing its effective on-resistance to 0.07Ω. It requires an external flying capacitor and Schottky diode (e.g., MBRS330T3) connected between VIN and BOOST; omitting this network degrades efficiency and increases thermal stress.
What thermal management is required for the LT1374HVCFE#TRPBF?
The LT1374HVCFE#TRPBF uses an FE16 package with exposed thermal pad. For reliable operation at full 4.25A load, the pad must be soldered to a minimum 0.5 square inch copper area connected to internal or backside ground planes. Thermal resistance θJA drops from >40°C/W (no pad connection) to ~30°C/W with proper grounding - critical for maintaining TJ < 125°C.
Can the LT1374HVCFE#TRPBF synchronize to an external clock?
Yes - the LT1374HVCFE#TRPBF includes a SYNC pin (Pin 12) that accepts logic-level signals from 580kHz to 1MHz with 10–90% duty cycle. This allows synchronization to system clocks or other regulators to eliminate beat frequencies and reduce EMI in multi-rail designs, as confirmed in the Electrical Characteristics and Applications Information sections.
LT1374HVCFE#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1374HVCFE#TRPBF FAQ
1.How can I place an order for LT1374HVCFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVCFE#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 LT1374HVCFE#TRPBF reliable?
The price and inventory of LT1374HVCFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVCFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374HVCFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVCFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVCFE#TRPBF?
LT1374HVCFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVCFE#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 LT1374HVCFE#TRPBF?
For technical support, including LT1374HVCFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVCFE#TRPBF requirements.
6.How does Aetrix verify that LT1374HVCFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVCFE#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 LT1374HVCFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374HVCFE#TRPBF?
All LT1374HVCFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVCFE#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 LT1374HVCFE#TRPBF part is unused and in its original packaging.
Return procedure for LT1374HVCFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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