My Inquiry
My Account
Analog Devices Inc. LT1374HVCS8#PBF
- Part No.:
- LT1374HVCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374HVCS8#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,195
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1374HVCS8#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, fixed 5V output, and SO-8 package. It delivers up to 4.25A at 5V from 6V–25V input, features cycle-by-cycle current limiting, 0.07Ω switch on-resistance, and 2.5mA typical quiescent current - used in battery-powered industrial power supplies requiring compact, robust DC/DC conversion.
For engineers reviewing the LT1374HVCS8#PBF datasheet, LT1374HVCS8#PBF pinout, LT1374HVCS8#PBF application, or LT1374HVCS8#PBF equivalent, key selection criteria include its 32V input capability, fixed 5V output with SENSE pin, thermal shutdown, synchronization support, and compatibility with standard surface-mount inductors down to 1.8µH for space-constrained designs.
Technical Context
The LT1374HVCS8#PBF implements current-mode control with an internal 500kHz oscillator, enabling fast transient response and stable loop behavior across wide load and line variations. 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 dual shutdown thresholds: 2.38V undervoltage lockout (UVLO) and 0.4V deep micropower shutdown, plus FB/SENSE pin functionality that enables frequency foldback and current limit reduction during overload - critical for short-circuit protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 25V (absolute max 32V); supports wide-input industrial and battery systems including 24V nominal rails. |
| Output Voltage | Fixed 5V ±1.2% (SENSE pin); eliminates external feedback resistors and improves accuracy vs adjustable variants. |
| Switch Current Limit | 4.5A typical (up to 6A peak); sustains full-load operation under transient surges without external current-sense components. |
| Switch On Resistance | 0.07Ω at 4.5A; reduces conduction loss and thermal stress, enabling >89% efficiency at 1A–4A loads. |
| Quiescent Supply Current | 2.5mA typical; minimizes standby power draw in always-on embedded systems. |
| Shutdown Current | 20µA max at VIN ≤ 32V; enables ultra-low-power sleep modes in portable equipment. |
| Switching Frequency | 500kHz ±8%; allows use of small inductors (e.g., 1.8µH) and ceramic output capacitors, reducing board area. |
| Thermal Shutdown | Active at TJ ≥ 125°C; protects device and system during sustained overload or poor heatsinking. |
Pinout & Package
LT1374HVCS8#PBF is housed in an 8-lead plastic SOIC (SO-8) package with fused ground pin (FGND) for improved thermal performance (θJA = 80°C/W with FGND connected to ground plane). The exposed FGND pad must be soldered to a large copper area for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply collector | Connects to main input rail (6–25V); powers internal bias circuitry and switch; requires local 100µF tantalum bypass. |
| BOOST | Switch driver boost supply | Drives internal NPN base above VIN via external capacitor/diode; enables saturation and 0.07Ω RON. |
| FGND | Fused ground reference | Primary ground return for power switch and error amplifier; must be tied to PCB ground plane for thermal and regulation stability. |
| VSW | Switch emitter node | Connects to inductor and catch diode cathode; swings negative to –0.8V during off-time; requires low-inductance layout. |
| VC | Error amplifier output | Controls peak switch current; used for loop compensation (capacitor to FGND) or external override/clamp. |
| BIAS | Efficiency-boost bias input | Accepts regulated output (≥3.3V) to power internal circuitry, improving efficiency at high VIN/light loads. |
| SYNC/SHDN | Multi-function logic pin | Configurable as sync input (580kHz–1MHz) or shutdown control (0.4V/2.38V thresholds); replaces SHDN on -SYNC variants. |
| SENSE | Fixed-output voltage sense | Direct connection to 5V output; replaces FB pin on adjustable versions; sets regulation point and enables foldback protection. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input support | 32V absolute maximum rating enables use in 24V industrial and automotive auxiliary power systems. |
| Integrated current-mode control | Eliminates need for external slope compensation or current-sense resistor; ensures stable operation across all duty cycles. |
| Frequency foldback protection | Reduces switching frequency 5:1 when SENSE voltage drops below 1V, limiting power dissipation during short-circuit faults. |
| Boost-driven saturated switch | Uses external BOOST capacitor to drive NPN base above VIN, achieving FET-like 0.07Ω conduction loss and >89% efficiency. |
| Two-threshold shutdown | Separate 2.38V UVLO and 0.4V deep-shutdown thresholds enable precise input sequencing and ultra-low-power sleep states. |
| SO-8 with fused ground | FGND pin provides dedicated low-impedance path for switch return current, improving thermal performance and load regulation. |
Applications
| Industrial Power Supplies | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Compact 24V-to-5V conversion in DIN-rail mounted PLC I/O modules with limited board space and ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Primary buck regulator delivering 4.25A at 5V with thermal shutdown and UVLO ensuring reliable operation during brownouts and overloads. Use Value: 32V input rating accommodates 24V ±20% industrial rails; SO-8 package fits dense layouts; 0.07Ω RON minimizes heat generation without heatsink. |
Use Scenario: Portable handheld multimeter with Li-ion battery (8.4V–12.6V) powering 5V microcontroller, display, and analog front-end. IC Role / Device Role / Timing Role: Main DC/DC converter providing regulated 5V from variable battery input, featuring 20µA shutdown current for extended battery life. Use Value: 2.5mA quiescent current extends runtime in active mode; frequency foldback prevents thermal runaway during probe short-circuits. |
| Medical Point-of-Care Devices | Distributed Telecom Power |
Use Scenario: Battery-backed vital signs monitor requiring clean, low-noise 5V supply for ADCs and wireless transceivers in EMI-sensitive clinical environments. IC Role / Device Role / Timing Role: Isolated 5V source with tight output tolerance (±1.2%) and low ripple, leveraging SENSE pin accuracy and BOOST-enabled low noise. Use Value: Fixed 5V output eliminates resistor tolerance errors; current-mode control suppresses noise coupling into sensitive analog circuits. |
Use Scenario: Remote radio unit (RRU) in 4G/LTE infrastructure drawing 5V from centralized 48V intermediate bus with strict thermal constraints. IC Role / Device Role / Timing Role: Local point-of-load regulator supporting up to 4.25A with synchronization capability to align switching edges with system clock and reduce EMI. Use Value: SYNC pin allows 580kHz–1MHz synchronization, enabling spread-spectrum techniques and avoiding beat frequencies with other converters. |
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; 2.5µA IQ | Higher efficiency at light loads; no BOOST pin or external diode required | Preferred for new designs needing lower IQ and smaller footprint; requires redesign for synchronous layout. |
| LM2678SD-5.0/NOPB | 40V input, 5A, SO-8; 260kHz switching; external compensation; no SYNC/BIAS pins | Simpler control but slower transient response; higher inductor size (typically 33µH) | Lower-cost alternative where 500kHz speed and foldback protection are not required. |
Compared with LTC3631EMSE#PBF, LT1374HVCS8#PBF offers higher peak current (4.5A vs 3.5A) and integrated BOOST-driven saturation for better heavy-load efficiency, while LM2678SD-5.0/NOPB trades switching speed and protection features for cost and simplicity in non-critical applications.
Availability
LT1374HVCS8#PBF is available at Aetrix Electronics and suitable for industrial power supplies, battery-powered test equipment, medical diagnostics devices, and distributed telecom power systems requiring stable component supply with long-term lifecycle assurance.
Supply support for LT1374HVCS8#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 support for legacy Linear power products. Linear pioneered high-performance analog ICs with emphasis on precision, reliability, and ruggedness in harsh environments.
The LT1374 family was designed for high-efficiency, high-current DC/DC conversion in space-constrained industrial and portable systems - emphasizing thermal robustness, wide input range, and integrated protection without external components.
FAQ
What is the maximum input voltage rating for the LT1374HVCS8#PBF?
The LT1374HVCS8#PBF has an absolute maximum input voltage rating of 32V, with recommended operating range of 6V to 25V. This high-voltage capability distinguishes it from the standard LT1374 (25V max) and makes it suitable for 24V industrial rails and automotive auxiliary systems where input transients exceed 28V. Operation beyond 25V requires verification of BOOST pin voltage margin (max 38V).
Does the LT1374HVCS8#PBF require an external catch diode?
Yes, the LT1374HVCS8#PBF requires an external Schottky catch diode (e.g., MBRS330T3) connected between VSW and GND. Unlike synchronous buck regulators, it uses an NPN power switch and relies on this diode to provide the freewheeling path during switch-off time. The diode's forward voltage and reverse recovery characteristics directly impact efficiency and thermal performance.
How does the SENSE pin function differ from the FB pin on adjustable LT1374 variants?
The SENSE pin on the LT1374HVCS8#PBF replaces the FB pin and connects directly to the 5V output to close the regulation loop - eliminating external feedback resistors and their associated tolerance errors. It also enables built-in foldback protection: when SENSE voltage drops below 1.7V, current limit reduces; below 1V, switching frequency folds back 5:1 to limit fault power dissipation - functionality not available on FB-based adjustable versions.
Can the LT1374HVCS8#PBF be synchronized to an external clock?
Yes, the LT1374HVCS8#PBF supports synchronization via its SYNC/SHDN pin, which accepts logic-level signals (10%–90% duty cycle) from 580kHz to 1MHz. When driven externally, the internal oscillator locks to the input frequency, enabling EMI reduction through switching edge alignment and elimination of beat frequencies in multi-converter systems.
What thermal considerations apply to the LT1374HVCS8#PBF in SO-8 package?
The LT1374HVCS8#PBF uses a fused ground (FGND) pin in SO-8 packaging, requiring direct soldering of the FGND pad to a large PCB copper area for effective heat transfer. With proper layout, θJA is 80°C/W; without FGND grounding, thermal resistance degrades significantly. Junction temperature must remain ≤125°C - derating is required above 70°C ambient, especially at >3A loads or high input voltages.
LT1374HVCS8#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1374HVCS8#PBF FAQ
1.How can I place an order for LT1374HVCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374HVCS8#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 LT1374HVCS8#PBF reliable?
The price and inventory of LT1374HVCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374HVCS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1374HVCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374HVCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374HVCS8#PBF?
LT1374HVCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374HVCS8#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 LT1374HVCS8#PBF?
For technical support, including LT1374HVCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374HVCS8#PBF requirements.
6.How does Aetrix verify that LT1374HVCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374HVCS8#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 LT1374HVCS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1374HVCS8#PBF?
All LT1374HVCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374HVCS8#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 LT1374HVCS8#PBF part is unused and in its original packaging.
Return procedure for LT1374HVCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1374HVCS8#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
