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Analog Devices Inc. LT1374HVIS8#PBF
- Part No.:
- LT1374HVIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374HVIS8#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:170
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Product details
Overview
LT1374HVIS8#PBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with integrated 4.5A NPN power switch, current-mode control, and fixed 5V output. It operates from 6V to 32V input, delivers up to 4.25A at 5V, features cycle-by-cycle current limiting, 20µA shutdown current, and uses an external boost capacitor to saturate the switch for low 0.07Ω effective on-resistance. It targets high-efficiency, space-constrained DC/DC conversion in battery-powered systems.
For engineers reviewing the LT1374HVIS8#PBF datasheet, LT1374HVIS8#PBF pinout, LT1374HVIS8#PBF application, or LT1374HVIS8#PBF equivalent, key selection criteria include its HV-rated 32V input capability, fixed 5V output with SENSE pin, thermal performance in SO-8 package (θJA = 30°C/W with PCB copper), synchronization support up to 1MHz, and compatibility with standard surface-mount inductors as small as 1.8µH.
Technical Context
The LT1374HVIS8#PBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops: one for output voltage regulation via the SENSE pin (5.0V ±1.2%), and another for cycle-by-cycle peak current sensing. Its bipolar NPN switch is driven by a BOOST pin voltage ≥15V above VIN to ensure saturation, enabling high efficiency (>89% at 5V/2A, VIN=10V) across wide load ranges.
It integrates undervoltage lockout (2.38V on SHDN), micropower shutdown (20µA), and foldback protection that reduces switching frequency and current limit under short-circuit conditions. The SO-8 package includes dedicated VIN, VSW, GND, BIAS, and SENSE pins - with BIAS enabling efficiency gains when tied to regulated output - and supports optional synchronization via the SYNC pin (replacing SHDN in -SYNC variants).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 32V - Enables direct operation from 24V industrial rails or 12V automotive batteries without pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.2% - Internally trimmed; SENSE pin connects directly to output for precision regulation without external resistors. |
| Max Output Current | 4.25A at VOUT=5V, VIN=10V - Limited by 4.5A switch rating and thermal design; derates at higher VIN or ambient temperature. |
| Switching Frequency | 500kHz (±8%) - Enables use of compact 1.8–10µH inductors; synchronizable to 580kHz–1MHz external clock. |
| Shutdown Current | 20µA typical - Reduces system standby power; triggered by <0.4V on SHDN pin. |
| Switch On Resistance | 0.07Ω typical - Achieved via BOOST-driven saturation; minimizes conduction loss and improves full-load efficiency. |
| Thermal Resistance θJA | 30°C/W - Validated with 0.5 in² copper area on backside ground plane; critical for sustained 4A operation. |
Pinout & Package
LT1374HVIS8#PBF is housed in an 8-lead plastic SOIC (SO-8) package with exposed pad for thermal enhancement. Pin 1 is marked with dot; pin 4 (GND) and pin 8 (GND) are both connected to the exposed thermal pad, requiring soldering to a large PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and switch collector | Accepts 6–32V input; powers internal circuitry; requires local 100µF solid tantalum bypass capacitor. |
| BOOST | Switch driver boost supply | Must be ≥15V above VIN; drives external boost capacitor/diode to saturate NPN switch and minimize VCE(sat). |
| FGND | Power ground (pin 4) | Primary return path for high di/dt switch current; must connect directly to input capacitor ground and thermal pad. |
| VSW | Switch emitter | Drives external catch diode and inductor; swings negative during off-time; clamped to −0.8V max. |
| VC | Error amplifier output / current limit setpoint | Used for loop compensation; voltage varies ~1V (light load) to ~2V (full load); can override regulation or enable shutdown. |
| BIAS | Internal bias supply input | Connect to regulated 5V output to reduce VIN supply current and improve efficiency at high VIN/light loads. |
| SYNC/SHDN | Multi-function logic input | At <0.4V: full shutdown (20µA IQ); at >1.5V: enables synchronization; not present on T7 package. |
| SENSE | Fixed-output voltage feedback | Replaces FB pin on adjustable versions; internally referenced to 5.0V; connects directly to 5V output node. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent stability with minimal external compensation components. |
| Integrated 4.5A NPN switch | Eliminates need for external MOSFET and gate driver; simplifies layout and reduces BOM count. |
| BOOST-driven saturation | Reduces effective switch resistance to 0.07Ω, improving efficiency over conventional bipolar designs by >14%. |
| Thermal shutdown & cycle-by-cycle current limit | Provides robust short-circuit and overload protection without external sensing circuitry. |
| BIAS pin efficiency optimization | When tied to 5V output, shifts internal bias current from VIN to VOUT, improving efficiency by >10% at VIN=20V/IOUT=25mA. |
Applications
| Battery-Powered Portable Equipment | Industrial Distributed Power |
|---|---|
|
Use Scenario: Powering microcontrollers, FPGAs, and sensors in handheld test instruments operating from Li-ion or 24V sealed lead-acid batteries. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated power with tight load transient response and low quiescent current during sleep modes. Use Value: 20µA shutdown current extends battery life; 500kHz switching allows compact 3.3µH inductor and low-profile 100µF tantalum output capacitor. |
Use Scenario: Local 5V rail generation in programmable logic controllers (PLCs) with 24V DC field bus input. IC Role / Device Role / Timing Role: High-reliability step-down regulator handling wide input transients (up to 32V) and maintaining stable 5V output under varying load and temperature. Use Value: 32V HV rating eliminates need for upstream TVS/clamping; thermal pad and θJA=30°C/W support continuous 4A operation in convection-cooled enclosures. |
| USB-C PD-Compatible Adapters | Automotive Infotainment Systems |
|
Use Scenario: Secondary-side 5V conversion in multi-output USB-C PD adapters where primary side delivers variable 5–20V. IC Role / Device Role / Timing Role: Fixed 5V synchronous buck stage accepting dynamically adjusted input voltage from primary controller. Use Value: Synchronization capability (via SYNC pin) aligns switching frequency with primary controller to suppress beat frequencies and simplify EMI filtering. |
Use Scenario: Powering display controllers and audio codecs in vehicle head units powered from 12V battery with cold-crank (6V) and load-dump (32V) extremes. IC Role / Device Role / Timing Role: Input-tolerant 5V regulator providing clean, ripple-free power despite harsh automotive voltage transients. Use Value: Undervoltage lockout (2.38V) prevents erratic startup during cranking; foldback current limiting protects external diode and inductor during sustained shorts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-5.0/NOPB | 5V fixed, 5A switch, 260kHz, SO-8, no BIAS or SYNC pin; higher quiescent current (50mA vs 2.5mA active). | Lacks synchronization and BIAS efficiency mode; better suited for cost-sensitive, non-synchronous designs with relaxed EMI requirements. | Select LM2678SD-5.0/NOPB only if 500kHz switching and micropower shutdown are not required. |
| TPS54332DR | 5V adjustable (requires resistor divider), 4A switch, 1MHz, SO-8, integrated BOOT diode, no exposed thermal pad. | Requires external feedback resistors; higher switching frequency enables smaller inductors but increases switching losses at high VIN. | Choose TPS54332DR when board space is extremely constrained and 1MHz operation is acceptable; avoid if fixed 5V simplicity and thermal performance are priorities. |
Compared with LM2678SD-5.0/NOPB and TPS54332DR, LT1374HVIS8#PBF uniquely combines fixed 5V output, 500kHz operation with synchronization, 20µA shutdown, and thermal-enhanced SO-8 packaging - making it optimal for high-efficiency, thermally demanding, and noise-sensitive 5V point-of-load applications.
Availability
LT1374HVIS8#PBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, industrial distributed power systems, USB-C PD adapter secondary rails, and automotive infotainment subsystems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1374HVIS8#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 its legacy of high-performance analog and power management ICs. Linear's design philosophy emphasizes robustness, precision, and ease of use in demanding applications.
The LT1374 family was engineered specifically for high-efficiency, high-current DC/DC conversion in space-constrained environments - targeting portable computing, battery charging, and distributed power architectures where thermal management and reliability are critical.
FAQ
What is the maximum input voltage rating for the LT1374HVIS8#PBF?
The LT1374HVIS8#PBF has a maximum input voltage rating of 32V, as confirmed by its HV suffix and Absolute Maximum Ratings table. This distinguishes it from the standard LT1374CS8 (25V max) and enables reliable operation in 24V industrial and automotive systems experiencing load dump transients. Always maintain at least 1V margin below 32V in final design.
Does the LT1374HVIS8#PBF require an external feedback resistor network?
No, the LT1374HVIS8#PBF does not require external feedback resistors because it is the fixed 5V output variant - the FB pin is replaced by a SENSE pin internally connected to the 5.0V reference. The SENSE pin must be connected directly to the regulated 5V output node for accurate closed-loop regulation and load transient response.
How does the BOOST pin function in the LT1374HVIS8#PBF?
The BOOST pin on the LT1374HVIS8#PBF provides a boosted drive voltage (≥15V above VIN) to the base of the internal NPN power switch, ensuring deep saturation and minimizing VCE(sat). It requires an external flying capacitor and Schottky diode (e.g., MBRS330T3); improper BOOST voltage results in elevated switch losses and reduced efficiency, especially at high input voltages.
Can the LT1374HVIS8#PBF be synchronized to an external clock?
Yes, the LT1374HVIS8#PBF supports synchronization via its SYNC/SHDN pin, which accepts logic-level signals (10–90% duty cycle) from 580kHz to 1MHz. When used for sync, the pin must be driven actively; leaving it floating defaults to shutdown mode. Note that synchronization replaces the shutdown function - full micropower shutdown is unavailable during sync operation.
What thermal design considerations apply to the LT1374HVIS8#PBF in SO-8 package?
The LT1374HVIS8#PBF SO-8 package achieves θJA = 30°C/W only when the exposed thermal pad is soldered to ≥0.5 in² of internal or backside PCB copper ground plane. Without this, θJA degrades to >40°C/W, risking thermal shutdown above ~2.5A. Thermal vias under the pad and connection to solid ground planes are mandatory for continuous 4A operation.
LT1374HVIS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SO
LT1374HVIS8#PBF FAQ
1.How can I place an order for LT1374HVIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVIS8#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 LT1374HVIS8#PBF reliable?
The price and inventory of LT1374HVIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1374HVIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVIS8#PBF?
LT1374HVIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVIS8#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 LT1374HVIS8#PBF?
For technical support, including LT1374HVIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVIS8#PBF requirements.
6.How does Aetrix verify that LT1374HVIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVIS8#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 LT1374HVIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1374HVIS8#PBF?
All LT1374HVIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVIS8#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 LT1374HVIS8#PBF part is unused and in its original packaging.
Return procedure for LT1374HVIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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