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Analog Devices Inc. LT1374HVIR#PBF
- Part No.:
- LT1374HVIR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374HVIR#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:117
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Product details
Overview
LT1374HVIR#PBF from Analog Devices (formerly Linear Technology) is a high-voltage 500kHz monolithic buck switching regulator with integrated 4.5A NPN power switch, current-mode control architecture, and 32V maximum input voltage rating. It delivers up to 4.25A at 5V output in fixed-voltage configuration and features cycle-by-cycle current limiting, thermal shutdown, and 20µA shutdown current. It is used in battery-powered industrial power supplies requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1374HVIR#PBF datasheet, LT1374HVIR#PBF pinout, LT1374HVIR#PBF application, or LT1374HVIR#PBF equivalent, key selection considerations include its 32V input capability, 0.07Ω switch on-resistance, 500kHz constant-frequency operation, BOOST pin biasing requirement, and compatibility with standard surface-mount inductors down to 1.8µH.
Technical Context
The LT1374HVIR#PBF implements a current-mode buck topology with internal 2.42V reference, error amplifier (2000 µMho transconductance), and slope-compensated peak-current sensing. Its bipolar NPN switch is driven via an external BOOST capacitor to achieve saturation, reducing conduction loss versus conventional bipolar designs.
It supports both fixed 5V output (SENSE pin) and adjustable output (FB pin) configurations, includes dual-threshold shutdown (0.4V full shutdown, 2.38V UVLO), and offers optional synchronization (580kHz–1MHz range) on compatible variants-though the IR-grade TSSOP package uses SHDN, not SYNC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - Enables direct use with 24V industrial rails and wide-range battery inputs without pre-regulation. |
| Switching Frequency | 460–540 kHz (typ. 500 kHz) - Enables compact magnetics; fixed frequency simplifies EMI filtering and avoids subharmonic instability. |
| Max Output Current | 4.25A at 5V - Achieved with 10µH inductor and VIN = 10V; derates with higher VIN or smaller L due to duty-cycle-dependent peak-current limit. |
| Switch On-Resistance | 0.07Ω (at 4.5A) - Minimizes conduction loss; enabled by BOOST-driven saturation of internal NPN switch. |
| Feedback Reference | 2.42V (adjustable) or 5.0V (fixed -5 variant) - High-accuracy reference enables ±1% output regulation over line/load/temperature. |
| Shutdown Current | 20 µA (max at VIN ≤ 32V) - Supports ultra-low-power standby in portable and remote-sensing applications. |
| Thermal Shutdown | 125°C junction temperature - Protects against sustained overload or poor PCB thermal design in enclosed environments. |
Pinout & Package
LT1374HVIR#PBF is housed in a 16-pin exposed-pad TSSOP (FE16) package with thermal pad soldered to ground plane for θJA ≈ 20–40°C/W depending on layout. Dual VIN and VSW pins are internally connected and must be shorted externally on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Multiple GND pins reduce ground impedance; critical for load regulation and EMI control-must connect directly to low-inductance ground plane. |
| VIN (Pins 3, 4) | Input supply and switch collector | Both pins must be shorted externally; high dI/dt node-requires local 100µF solid tantalum + 0.27µF ceramic bypass close to pins. |
| BOOST (Pin 5) | Switch driver boost supply | Connected to VIN + 5V via external diode/capacitor; ensures NPN saturation and <0.07Ω effective RCE(sat). |
| FB/SENSE (Pin 6) | Error amplifier input or fixed-output sense | Configured as SENSE for 5V fixed output (LT1374HVIR#PBF is -5 variant); connects directly to regulated 5V output. |
| SHDN (Pin 13) | Shutdown control input | Logic-low (<0.6V) disables switching; 2.38V threshold provides precise undervoltage lockout (UVLO) functionality. |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Used for loop compensation; voltage ranges ~1V (light load) to ~2V (full load); can be clamped to force shutdown. |
| BIAS (Pin 15) | Internal bias supply input | Connect to regulated output (≥3.3V) to improve efficiency at high VIN/light load; not present in DD/SO-8 packages. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Support | 32V max input enables direct interface with 24V industrial buses and lead-acid battery systems without front-end bucking. |
| Integrated BOOST Drive | External BOOST capacitor/diode network saturates internal NPN switch, achieving FET-like 0.07Ω conduction loss and >89% efficiency. |
| Current-Mode Control | Provides inherent cycle-by-cycle current limiting, fast transient response, and stable loop behavior across wide input/output ranges. |
| Frequency Foldback Protection | Reduces switching frequency 5:1 when FB/SENSE <1V during short-circuit, limiting power dissipation in IC, diode, and inductor. |
| Multi-Threshold Shutdown | Dual thresholds (0.4V full shutdown, 2.38V UVLO) allow flexible power sequencing and brown-out protection without external circuitry. |
Applications
| Industrial 24V-to-5V Point-of-Load | Portable Test Equipment Power |
|---|---|
Use Scenario: Distributed 5V rail generation from 24V factory automation bus with space-constrained PCB layout. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V/4.25A to microcontroller, sensors, and I/O drivers. Use Value: 32V input rating eliminates need for pre-regulator; 500kHz switching allows 1.8µH inductor, reducing board area by >40% vs. 100kHz alternatives. |
Use Scenario: Battery-powered handheld oscilloscope requiring low-noise, high-efficiency 5V supply with deep sleep mode. IC Role / Device Role / Timing Role: Main system regulator enabling <20µA quiescent draw in shutdown while maintaining fast wake-up capability. Use Value: 20µA shutdown current extends Li-ion battery life; BOOST-saturated switch maintains >88% efficiency at 100mA–4A load range. |
| Medical Sensor Module Supply | Ruggedized IoT Edge Node |
Use Scenario: Compact wearable vital-sign monitor powered by single-cell LiPo (4.2V) or two-cell pack (8.4V), requiring clean 5V for analog front-end. IC Role / Device Role / Timing Role: Isolated 5V source with tight load regulation and low output ripple for ADC reference and op-amp biasing. Use Value: 2.42V reference accuracy and current-mode control deliver <±1% output regulation across –40°C to 125°C; BIAS pin improves light-load efficiency. |
Use Scenario: Outdoor environmental sensor node operating from solar-charged 24V battery bank with intermittent connectivity. IC Role / Device Role / Timing Role: Primary DC/DC converter powering MCU, LoRa transceiver, and temperature/humidity sensors under wide thermal and input-voltage variation. Use Value: Thermal shutdown and UVLO prevent damage during cold-start or overvoltage events; exposed-pad TSSOP aids heat dissipation 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 |
|---|---|---|---|
| LTC3631EMSE#PBF | 42V input, 3.5A, 3mm × 4mm MSOP; synchronous rectification; no BOOST pin required. | Better efficiency at light loads; no external catch diode needed; lacks foldback protection. | Select when footprint and efficiency >10% at <100mA are critical; avoid if short-circuit robustness is mandatory. |
| TPS54332DR | 28V input, 3.5A, SO-8; integrated MOSFETs; 100kHz–2.5MHz programmable frequency. | Lower IQ (4.5µA), but no UVLO shutdown threshold; requires external compensation. | Select for ultra-low-IQ battery apps where 32V input headroom is unnecessary; verify loop stability with target output cap. |
Compared with LTC3631EMSE#PBF and TPS54332DR, LT1374HVIR#PBF offers superior short-circuit resilience via frequency foldback and dual-threshold shutdown, higher current capability (4.5A vs. 3.5A), and proven ruggedness in industrial 24V systems-but requires external diode and BOOST network.
Availability
LT1374HVIR#PBF is available at Aetrix Electronics and suitable for industrial automation, portable instrumentation, medical sensor modules, and ruggedized IoT edge nodes requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1374HVIR#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 family, known for precision analog, power management, and signal conditioning ICs.
The LT1374HVIR#PBF belongs to Linear's high-voltage monolithic buck regulator product line, designed specifically for industrial, automotive, and telecom applications demanding robust 32V input operation, high current density, and fault-tolerant protection.
FAQ
What is the maximum input voltage rating for the LT1374HVIR#PBF?
The LT1374HVIR#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 use with 24V industrial power buses and two-cell Li-ion or lead-acid battery systems without pre-regulation. Operation above 32V risks permanent damage.
Does the LT1374HVIR#PBF require an external catch diode, and why?
Yes, the LT1374HVIR#PBF requires an external Schottky catch diode (e.g., MBRS330T3) because it integrates only an NPN bipolar power switch-not a synchronous MOSFET. During switch-off, inductor current flows through the external diode to maintain continuity. Omitting it causes destructive voltage spikes at VSW exceeding –0.8V, risking device failure.
How does the BOOST pin function in the LT1374HVIR#PBF, and what happens if it's unconnected?
The BOOST pin supplies elevated drive voltage to saturate the internal NPN switch. It must be connected to VIN + 5V via an external diode and capacitor. If unconnected or improperly biased, the switch operates in linear region, increasing VCE(sat) to ~1.5V and reducing efficiency from >89% to ~75%, potentially causing thermal runaway at full load.
Is the LT1374HVIR#PBF a fixed 5V output device, and how is that configured?
Yes, the "IR" suffix denotes the industrial-grade (-40°C to 125°C) version, and the "#PBF" packaging confirms it is the fixed 5V output variant (LT1374HVIR-5). Its FB pin is internally wired as SENSE and must be connected directly to the 5V output node-no external resistor divider is used or required.
What thermal management provisions does the LT1374HVIR#PBF package include?
The LT1374HVIR#PBF uses a 16-pin FE16 (exposed-pad TSSOP) package with an internal thermal pad soldered to the PCB ground plane. With proper 0.5 in² copper area, θJA drops to ~20–40°C/W. The datasheet specifies θJC = 4°C/W and mandates thermal vias under the pad to transfer heat to inner layers or heatsink planes.
LT1374HVIR#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- DDPAK-7
LT1374HVIR#PBF FAQ
1.How can I place an order for LT1374HVIR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVIR#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 LT1374HVIR#PBF reliable?
The price and inventory of LT1374HVIR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVIR#PBF is usually 5 days.
3.What payment methods are accepted for LT1374HVIR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVIR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVIR#PBF?
LT1374HVIR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVIR#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 LT1374HVIR#PBF?
For technical support, including LT1374HVIR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVIR#PBF requirements.
6.How does Aetrix verify that LT1374HVIR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVIR#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 LT1374HVIR#PBF meets industry standards.
7.What is the process for return or replacement of LT1374HVIR#PBF?
All LT1374HVIR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVIR#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 LT1374HVIR#PBF part is unused and in its original packaging.
Return procedure for LT1374HVIR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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