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Analog Devices Inc. LT1374HVIFE#PBF
- Part No.:
- LT1374HVIFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1374HVIFE#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
LT1374HVIFE#PBF 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 for fast transient response, uses external BOOST capacitor for switch saturation (0.07Ω RDS(on)-equivalent), and supports shutdown (20µA IQ) and synchronization (580kHz–1MHz). It is used in industrial power supplies requiring compact, efficient 5V/4.25A conversion from 6–25V inputs.
For engineers reviewing the LT1374HVIFE#PBF datasheet, LT1374HVIFE#PBF pinout, LT1374HVIFE#PBF application, or LT1374HVIFE#PBF equivalent, key selection factors include its HV-rated 32V input capability, exposed-pad 16-pin TSSOP thermal performance (θJA = 40°C/W with ground plane), fixed 5V SENSE-pin configuration, and cycle-by-cycle current limiting with foldback protection under short-circuit conditions.
Technical Context
The LT1374HVIFE#PBF implements constant-frequency current-mode control using an internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the SENSE pin. Its bipolar NPN switch is driven via BOOST pin to achieve saturation-reducing conduction loss and enabling >89% efficiency at 5V/3A with 10µH inductor.
It integrates undervoltage lockout (2.38V on SHDN), dual-threshold shutdown (0.4V full shutdown), and frequency foldback triggered below 1V on SENSE pin. The BIAS pin (available in FE16 package) allows output-derived biasing to improve light-load efficiency when VOUT ≥ 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - Enables direct use with 24V industrial rails and wide-input battery systems without pre-regulation. |
| Output Voltage | Fixed 5V ±2% - Internally trimmed SENSE pin eliminates external feedback resistors; reduces BOM count and layout sensitivity. |
| Switch Current Limit | 4.5A typical at ≤50% duty cycle - Supports continuous 4.25A output with proper inductor sizing and thermal management. |
| Switching Frequency | 500kHz ±8% - Enables use of small 1.8–10µH inductors; reduces solution footprint vs. lower-frequency buck regulators. |
| Shutdown Current | 30µA max at 32V input - Ensures ultra-low quiescent power in battery-backed or always-on standby modes. |
| Thermal Resistance θJA | 40°C/W with exposed pad soldered to ground plane - Requires PCB copper area for reliable 4.25A operation at 125°C junction temperature. |
| SENSE Pin Voltage | 5.0V ±1.2% - Directly monitors regulated 5V output; enables precise load regulation and accurate current foldback triggering. |
Pinout & Package
LT1374HVIFE#PBF is housed in a 16-pin Exposed Pad TSSOP (FE16) package. The exposed thermal pad must be soldered to a PCB ground plane for thermal integrity and EMI control. Dual VIN and VSW pins are internally paralleled and must be shorted externally on the board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Four dedicated GND pins minimize ground impedance; critical for load regulation accuracy and EMI suppression of VSW-edge currents. |
| VIN (Pins 3, 4) | Main input supply connection | Dual pins reduce trace inductance and IR drop; must be shorted externally and decoupled near the package with low-ESR capacitor. |
| BOOST (Pin 5) | Switch driver boost supply | Requires external diode + capacitor (e.g., CMDSH3 + 100nF) to generate ~VIN+5V drive voltage for NPN saturation. |
| FB/SENSE (Pin 6) | Fixed 5V output sense input | Internally connected to 5V output node; triggers frequency/current foldback if voltage drops below 1V or 1.7V respectively. |
| SYNC (Pin 12) | External clock synchronization input | Logic-level compatible (1.5–2.2V threshold); extends operating range from 580kHz to 1MHz to avoid noise-sensitive bands. |
| SHDN (Pin 13) | Shutdown control input | 2.38V UVLO threshold prevents startup until input is valid; 0.4V forces full micropower shutdown (≤30µA). |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Provides access to loop compensation network; also serves as current clamp point (0.9V turn-off threshold). |
| BIAS (Pin 15) | Efficiency-boosting auxiliary supply | Accepts 3–7V external bias (e.g., from 5V output); reduces VIN supply current and improves light-load efficiency by >10%. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Support | 32V absolute max rating enables compatibility with 24V industrial, telecom, and automotive battery systems without derating. |
| Integrated Current Foldback Protection | Reduces switch current limit and switching frequency during output short-circuit - limits IC/diode/inductor power dissipation without external circuitry. |
| BOOST-Driven Saturated Switch | 0.07Ω effective on-resistance achieved via external BOOST capacitor - delivers >89% efficiency at 5V/3A, outperforming standard bipolar buck designs. |
| Exposed-Pad Thermal Management | θJA = 40°C/W with proper PCB copper - supports 4.25A continuous output in compact layouts where SO-8 or DD packages would thermally saturate. |
| BIAS Pin Efficiency Optimization | Allows internal bias circuitry to draw current from regulated 5V output instead of 24V input - improves light-load efficiency by >10% at VIN = 20V. |
Applications
| Industrial 24V-to-5V Power Supply | Portable Test Equipment Power |
|---|---|
Use Scenario: Converting unregulated 24V rail in PLC I/O modules to stable 5V for microcontrollers and sensors. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC buck converter delivering up to 4.25A with tight load regulation and thermal robustness. Use Value: Eliminates need for external current-sense resistor or foldback circuitry; 32V rating avoids input overvoltage derating; exposed pad sustains full load in confined enclosures. |
Use Scenario: Powering handheld oscilloscopes and multimeters from Li-ion batteries (8–25V range) with minimal heat generation. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating across wide input range while maintaining 5V USB-compliant output. Use Value: 20µA shutdown current extends battery life; BIAS pin operation improves efficiency at light loads; 500kHz switching minimizes inductor size for portability. |
| Battery Charger Auxiliary Rail | Distributed Power for Embedded Systems |
Use Scenario: Generating clean 5V supply for charger controller ICs and status LEDs during CC/CV charging of 3S–6S Li-ion packs. IC Role / Device Role / Timing Role: Secondary regulated rail isolated from main charging path; requires high PSRR and low noise under dynamic load steps. Use Value: Current-mode control ensures fast transient response to LED blink loads; SENSE pin accuracy maintains ±2% output tolerance across temperature. |
Use Scenario: Providing local 5V power to FPGA I/O banks or Ethernet PHYs on dense carrier boards with limited board area. IC Role / Device Role / Timing Role: Compact, high-density point-of-load regulator minimizing voltage drop and thermal coupling to sensitive analog sections. Use Value: 16-pin TSSOP with exposed pad fits tight spacing; SYNC pin allows clock alignment to system master clock to suppress beat frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#PBF | 4A synchronous buck, 36V max input, 3mm × 4mm DFN, no BOOST pin required | Higher integration (integrated MOSFETs), lower quiescent current (25µA), but lacks foldback protection and fixed 5V option | Select for space-constrained designs needing synchronous efficiency; avoid if foldback short-circuit protection is mandatory. |
| LM5164QPWPRQ1 | 1.5A buck, 100V max input, SOIC-10, integrated high-side FET, no BIAS pin | Higher input voltage range, AEC-Q100 qualified, but lower current rating and no fixed 5V SENSE variant | Select for automotive environments requiring 65V transients; not suitable for 4.25A industrial loads. |
Compared with LTC3605EDE#PBF and LM5164QPWPRQ1, the LT1374HVIFE#PBF uniquely combines 32V input, 4.5A switch, fixed 5V SENSE interface, and analog foldback protection in a thermally optimized TSSOP - making it optimal for industrial 24V-to-5V applications demanding reliability over raw integration.
Availability
LT1374HVIFE#PBF is available at Aetrix Electronics and suitable for industrial power supplies, portable test equipment, battery charger auxiliary rails, and distributed embedded power systems requiring stable component supply with long-term lifecycle support.
Supply support for LT1374HVIFE#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 and maintains full technical and manufacturing continuity for the LT product line, known for high-performance analog and power management ICs.
The LT1374HVIFE#PBF belongs to Linear's high-voltage monolithic buck regulator family, designed specifically for industrial and telecom applications requiring rugged 32V input operation, fixed-output simplicity, and robust thermal performance in surface-mount packages.
FAQ
What is the maximum continuous output current supported by the LT1374HVIFE#PBF?
The LT1374HVIFE#PBF supports up to 4.25A continuous output at 5V with appropriate inductor selection (e.g., 10µH), PCB copper area for thermal dissipation, and input voltage ≥8V. Peak switch current is rated at 4.5A ≤50% duty cycle, decreasing nonlinearly above that due to internal slope compensation - actual max load depends on VIN, L value, and ambient temperature.
Does the LT1374HVIFE#PBF require an external BOOST capacitor, and why?
Yes, the LT1374HVIFE#PBF requires an external BOOST capacitor (and associated diode, e.g., CMDSH3) connected between BOOST and SW pins. This generates a voltage ~5V above VIN to fully saturate the internal NPN power switch, achieving an effective on-resistance of 0.07Ω and enabling >89% efficiency - without it, conduction losses increase significantly.
How does the SENSE pin on the LT1374HVIFE#PBF differ from the FB pin on adjustable versions?
The LT1374HVIFE#PBF uses a SENSE pin instead of FB - it is internally connected directly to the 5V output node and has a fixed 5.0V ±1.2% threshold. Unlike adjustable FB variants, no external resistor divider is needed. It also enables automatic foldback: voltage <1.7V reduces current limit; <1V reduces switching frequency - providing intrinsic short-circuit protection.
Can the LT1374HVIFE#PBF be synchronized to an external clock, and what is its sync range?
Yes, the LT1374HVIFE#PBF supports synchronization via its SYNC pin (Pin 12), which accepts logic-level signals (10–90% duty cycle) with thresholds of 1.5–2.2V. Its synchronizing range extends from 580kHz to 1MHz - allowing alignment to system clocks or avoidance of noise-sensitive frequency bands without modifying internal oscillator components.
What thermal design considerations apply to the LT1374HVIFE#PBF in its FE16 package?
The LT1374HVIFE#PBF in FE16 package achieves θJA = 40°C/W only when its exposed thermal pad is soldered to a minimum 0.5 square inch PCB copper area tied to ground. Without this, θJA degrades to >60°C/W, risking thermal shutdown at >3A. GND pins (1,8,9,16) must also connect to the same plane to maintain low-impedance return paths for VSW edge currents.
LT1374HVIFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1374HVIFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVIFE#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 LT1374HVIFE#PBF reliable?
The price and inventory of LT1374HVIFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVIFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1374HVIFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVIFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVIFE#PBF?
LT1374HVIFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVIFE#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 LT1374HVIFE#PBF?
For technical support, including LT1374HVIFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVIFE#PBF requirements.
6.How does Aetrix verify that LT1374HVIFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVIFE#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 LT1374HVIFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1374HVIFE#PBF?
All LT1374HVIFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVIFE#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 LT1374HVIFE#PBF part is unused and in its original packaging.
Return procedure for LT1374HVIFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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