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Analog Devices Inc. LT1374HVCFE#PBF
- Part No.:
- LT1374HVCFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1374HVCFE#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:692
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Product details
Overview
LT1374HVCFE#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, 0.07Ω typical switch on-resistance, and current-mode control architecture for fast transient response. It delivers up to 4.25A at 5V output in the FE16 TSSOP package with exposed pad, targeting compact DC/DC conversion in battery-powered industrial systems.
For engineers reviewing the LT1374HVCFE#PBF datasheet, LT1374HVCFE#PBF pinout, LT1374HVCFE#PBF application, or LT1374HVCFE#PBF equivalent, key selection criteria include its HV-rated 32V input capability, cycle-by-cycle current limiting, shutdown current of 30µA (max), BOOST pin biasing requirement, and compatibility with surface-mount 1.8–20µH inductors for footprint-constrained designs.
Technical Context
The LT1374HVCFE#PBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops: one via the error amplifier (VC pin) setting peak switch current, and another via the current-sense amplifier monitoring switch conduction in real time. This architecture ensures stable loop dynamics across wide load and input ranges without external compensation complexity.
It employs a saturating bipolar NPN switch driven by a BOOST pin-requiring an external capacitor-diode network-to achieve low 0.07Ω effective on-resistance and >89% efficiency at 5V/4.25A. The BIAS pin (present in FE16) enables efficiency optimization by sourcing internal bias current from the regulated output when VIN ≥ 20V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - Enables direct operation from 24V industrial rails or multi-cell Li-ion batteries without pre-regulation. |
| Switching Frequency | 460–540kHz (typ. 500kHz) - Allows use of small 1.8–5µH inductors; supports synchronization up to 1MHz. |
| Output Current Capability | 4.25A at 5V (VOUT = 5V, VIN = 10V, L = 5µH) - Confirmed in Typical Performance Characteristics Figure 15. |
| Switch On-Resistance | 0.07Ω (typ.) at ISW = 4.5A - Achieved via BOOST pin drive; reduces conduction loss vs. standard bipolar designs. |
| Shutdown Supply Current | 30µA (max) at VIN ≤ 32V - Enables ultra-low-power standby in portable equipment with battery runtime extension. |
| Feedback Reference Voltage | 2.42V (typ.) - Sets output voltage via external resistor divider; ±0.03V tolerance over temperature. |
| Thermal Protection | Thermal shutdown + full cycle-by-cycle short-circuit protection - Ensures robustness under sustained overload or fault conditions. |
Pinout & Package
LT1374HVCFE#PBF is housed in a 16-pin TSSOP package (FE16) with exposed thermal pad, optimized for high-power density and thermal dissipation. The dual VIN and VSW pins must be shorted externally on PCB; GND pins are distributed for low-impedance return paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Multiple pins reduce ground path impedance; critical for load regulation and EMI control-must connect directly to solid ground plane. |
| VIN (Pins 3, 4) | Main input supply connection | Dual pins support high-current input routing; requires local 100µF tantalum bypass close to pins to suppress dI/dt spikes. |
| BOOST (Pin 5) | Switch driver boost supply | Must be biased 5V above VIN via external capacitor/diode; enables NPN saturation and 0.07Ω RON. |
| FB/SENSE (Pin 6) | Feedback or fixed-output sense input | 2.42V reference input for adjustable versions; on LT1374HVCFE#PBF, configured as SENSE for 5V fixed output (no external divider needed). |
| VSW (Pins 10, 11) | Switch emitter node | Dual pins carry full inductor current; must be shorted externally and routed with minimal trace inductance to catch diode. |
| SYNC (Pin 12) | External oscillator synchronization input | Logic-compatible (10–90% duty cycle); shifts frequency from 580kHz to 1MHz-replaces SHDN function in -SYNC variants. |
| SHDN (Pin 13) | Shutdown control input | Two thresholds: 2.38V UVLO lockout and 0.4V deep shutdown; draws only 30µA in shutdown state. |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Direct access to control loop; used for compensation, current clamping, or override-sits at ~1–2V under load. |
| BIAS (Pin 15) | Efficiency-optimized bias supply | Accepts 3–7V external source (e.g., VOUT); reduces VIN supply current and improves efficiency at high VIN/light load. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Support | 32V max input (LT1374HV variant) - Eliminates need for upstream buck pre-regulator in 24V industrial or automotive auxiliary systems. |
| Integrated Cycle-by-Cycle Current Limit | 4.5A switch current limit with automatic foldback below 1.7V FB voltage - Protects IC, diode, and inductor during short-circuit without external sensing. |
| BOOST-Driven Saturating Switch | 0.07Ω typical RON achieved via external BOOST capacitor - Delivers >89% efficiency at 5V/4.25A, outperforming conventional bipolar regulators. |
| Flexible Control Options | Independent SHDN and SYNC pins (not multiplexed) - Enables simultaneous enable/disable control and frequency synchronization in multi-rail systems. |
| BIAS Pin Efficiency Optimization | Reduces total supply current by >10% at VIN = 20V, VOUT = 5V, IOUT = 25mA - Critical for battery life in always-on IoT edge nodes. |
Applications
| Industrial 24V Distributed Power | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Converting unregulated 24V rail to isolated 5V logic supply in PLC I/O modules with space constraints and thermal limits. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 4.25A at 5V with cycle-by-cycle current limiting and thermal shutdown. Use Value: 32V input rating avoids pre-regulation; 0.07Ω RON and exposed-pad TSSOP enable 4.25A delivery within 125°C junction limit without heatsink. |
Use Scenario: Powering microcontroller, display, and sensor subsystems in handheld ultrasound or glucose monitors powered by dual-cell Li-ion (8.4V max). IC Role / Device Role / Timing Role: High-efficiency 5V step-down converter with <30µA shutdown current to extend battery runtime between charges. Use Value: 30µA shutdown current and BIAS pin operation at light load preserve battery capacity; 500kHz switching minimizes inductor size for handheld form factor. |
| Battery Charger Auxiliary Supply | Test & Measurement Equipment |
|
Use Scenario: Generating clean 5V bias for op-amps and ADC references in multi-chemistry Li-ion/NiMH battery chargers with variable input (9–28V). IC Role / Device Role / Timing Role: Fixed 5V buck regulator with SENSE pin configuration, providing low-noise, tightly regulated auxiliary rail. Use Value: 5.0V ±0.6% output accuracy (4.94–5.06V) and current-mode control ensure stable reference voltage despite input ripple from charger switching noise. |
Use Scenario: Supplying FPGA I/O banks and analog front-end circuitry in benchtop oscilloscopes requiring precise, low-ripple 5V at up to 4A. IC Role / Device Role / Timing Role: High-current, low-EMI buck controller with synchronized switching to avoid beat frequencies with main system clock. Use Value: SYNC pin allows locking to 100MHz system clock, eliminating switching noise interference in sensitive analog acquisition 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 | 40V input, 3.5A, 3mm × 4mm MSOP; uses MOSFET switch (lower RDS(on)), no BOOST pin required | Higher efficiency at light loads due to MOSFET architecture; lacks cycle-by-cycle foldback below 1.7V FB | Prefer for new designs prioritizing light-load efficiency and layout simplicity; not drop-in-requires different external components. |
| TPS544B20RQFT | 18V input, 4A, 3.5mm × 3.5mm QFN; integrated FETs, PMBus interface, 500kHz–2MHz programmable frequency | Digital control enables dynamic voltage scaling and telemetry; no BIAS pin or BOOST functionality | Select when digital monitoring or adaptive frequency is required; unsuitable for 24V+ input applications due to 18V VIN limit. |
Compared with LTC3631EMSE#PBF and TPS544B20RQFT, LT1374HVCFE#PBF uniquely combines 32V input tolerance, bipolar BOOST-driven efficiency at high current, and analog-foldback protection-making it optimal for ruggedized 24V industrial converters where reliability under fault conditions is paramount.
Availability
LT1374HVCFE#PBF is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and battery charger auxiliary supplies requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LT1374HVCFE#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1374HVCFE#PBF belongs to Linear's legacy high-voltage monolithic buck regulator family, designed specifically for space-constrained, high-reliability DC/DC conversion in 24V industrial and battery-powered systems where thermal robustness and fault tolerance are critical.
FAQ
What is the maximum input voltage rating for LT1374HVCFE#PBF?
The LT1374HVCFE#PBF has a maximum input voltage rating of 32V, confirmed in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1374 (25V max) and enables direct operation from 24V nominal industrial rails without pre-regulation. Operation beyond 32V risks permanent damage per datasheet specifications.
Does LT1374HVCFE#PBF require an external BOOST capacitor, and why?
Yes, LT1374HVCFE#PBF requires an external BOOST capacitor (and associated diode) connected between VIN and BOOST pins. This network generates a voltage ~5V above VIN to fully saturate the internal bipolar NPN switch, achieving the specified 0.07Ω on-resistance. Omitting it results in higher conduction losses and reduced efficiency-particularly noticeable above 2A load.
What output voltage does LT1374HVCFE#PBF deliver, and how is it set?
LT1374HVCFE#PBF is the fixed 5V output variant: it uses the SENSE pin (pin 6) internally connected to the 5V output, eliminating the need for external feedback resistors. Its output voltage is trimmed to 4.94–5.06V (±1.2%) at 25°C, with line regulation of 0.03%/V across 6–32V input range-verified in Electrical Characteristics Table.
Can LT1374HVCFE#PBF synchronize to an external clock, and what is its range?
Yes, LT1374HVCFE#PBF supports external synchronization via the SYNC pin (pin 12). It accepts logic-level signals (10–90% duty cycle) and locks to frequencies from 580kHz up to 1MHz-extending beyond its native 500kHz. This feature is essential for noise-sensitive applications like test equipment where switching harmonics must align with system clocks.
What thermal management considerations apply to LT1374HVCFE#PBF in the FE16 package?
LT1374HVCFE#PBF in the FE16 TSSOP package requires soldering the exposed thermal pad to a minimum 0.5 square inch copper area on an internal or backside ground plane. With proper layout, θJA is 30°C/W; inadequate copper area raises junction temperature rapidly. At 4.25A/5V, thermal simulation shows >100°C rise without adequate pad connection-risking thermal shutdown.
LT1374HVCFE#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LT1374HVCFE#PBF FAQ
1.How can I place an order for LT1374HVCFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVCFE#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 LT1374HVCFE#PBF reliable?
The price and inventory of LT1374HVCFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVCFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1374HVCFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVCFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVCFE#PBF?
LT1374HVCFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVCFE#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 LT1374HVCFE#PBF?
For technical support, including LT1374HVCFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVCFE#PBF requirements.
6.How does Aetrix verify that LT1374HVCFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVCFE#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 LT1374HVCFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1374HVCFE#PBF?
All LT1374HVCFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVCFE#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 LT1374HVCFE#PBF part is unused and in its original packaging.
Return procedure for LT1374HVCFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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