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Analog Devices Inc. LT1374CS8-5#PBF
- Part No.:
- LT1374CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374CS8-5#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:701
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Product details
Overview
LT1374CS8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A monolithic buck switching regulator in an 8-lead SOIC package. It operates at a constant 500kHz switching frequency, features cycle-by-cycle current limiting, 0.07Ω switch on-resistance, and 20µA shutdown current. It delivers regulated 5V output from 6V–25V input for high-efficiency point-of-load conversion in portable and battery-powered systems.
For engineers reviewing the LT1374CS8-5#PBF datasheet, LT1374CS8-5#PBF pinout, LT1374CS8-5#PBF application, or LT1374CS8-5#PBF equivalent, key selection criteria include its fixed 5V SENSE-pin configuration, thermal shutdown and short-circuit protection, BOOST-capacitor-driven saturation architecture, and compatibility with standard surface-mount inductors down to 1.8µH.
Technical Context
The LT1374CS8-5#PBF implements current-mode control with an internal 2.42V reference and dedicated SENSE pin (replacing FB) for fixed 5V regulation. Its bipolar NPN power switch is driven via a BOOST pin that enables saturation-reducing conduction loss to ~0.07Ω-and improving efficiency to >89% at full load.
It integrates oscillator, error amplifier (2000 µMho transconductance), slope compensation, and dual-threshold shutdown (2.38V UVLO, 0.4V deep shutdown). The device supports synchronization up to 1MHz on SYNC-capable variants, though LT1374CS8-5#PBF uses SHDN instead of SYNC per its -5 suffix and SO-8 pinout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.2% (SENSE pin tied directly to VOUT) |
| Max Output Current | 4.25 A continuous (at VOUT = 5V, VIN = 10V, L = 5µH) |
| Switching Frequency | 500 kHz ±8% (constant-frequency, not load-dependent) |
| Switch On-Resistance | 0.07 Ω (enables low conduction loss and high efficiency at 4.5A) |
| Shutdown Current | 20 µA (reduces system standby power significantly) |
| Input Voltage Range | 6 V to 25 V (minimum start-up voltage is 5.5 V) |
| Efficiency | 95% typical at 2 A, VIN = 10 V, VOUT = 5 V (with optimized external components) |
| Thermal Protection | Internal thermal shutdown with automatic recovery (TJMAX = 125°C) |
Pinout & Package
LT1374CS8-5#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 or large copper lands.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and switch collector | Accepts 6–25 V input; powers internal circuitry; requires local bypass capacitor |
| BOOST | Boost capacitor drive node | Provides >VIN voltage to saturate NPN switch; must be connected via external diode/capacitor |
| FGND | Fused ground reference | Primary GND connection; must be soldered to PCB ground plane for thermal and noise control |
| VSW | Switch emitter | Drives external catch diode and inductor; swings negative during off-time (clamped to –0.8 V) |
| VC | Error amplifier output / current limit control | Used for loop compensation; also serves as current clamp input (0.9 V threshold) |
| BIAS | Efficiency-boost bias supply | Connect to VOUT ≥3.3 V to reduce VIN supply current and improve light-load efficiency |
| SHDN | Shutdown control | Logic-low (<0.4 V) disables switching; 2.38 V threshold provides precise undervoltage lockout |
| SENSE | Fixed 5V output feedback | Replaces FB pin; internally referenced to 5.0 V ±1.2%; connected directly to regulated output |
Key Features
| Feature | Design Value |
|---|---|
| Saturating NPN switch | 0.07 Ω on-resistance enables >89% peak efficiency without MOSFET-level gate drive complexity |
| Integrated current-mode control | Eliminates need for external slope compensation; ensures stable operation across wide duty cycles |
| Dual-threshold shutdown | 2.38 V UVLO prevents startup until input is valid; 0.4 V deep shutdown reduces quiescent current to 20 µA |
| BOOST-driven saturation | External BOOST capacitor/diode lifts drive voltage above VIN, enabling bipolar switch saturation and low VCE(sat) |
| Full-cycle short-circuit protection | Cycle-by-cycle current limiting + thermal shutdown prevent damage during sustained overload or output short |
| Surface-mount optimized | Supports all-SMT design with standard 1.8–10 µH inductors and solid tantalum or ceramic output capacitors |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded controllers and peripherals in clamshell notebooks and tablets. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying logic rails; operates continuously during active use and enters low-IQ shutdown during sleep. Use Value: 20 µA shutdown current extends battery life; 500 kHz switching allows compact 2.2 µH inductors and avoids audible noise. |
Use Scenario: Power management in handheld test equipment, portable medical monitors, and ruggedized field instruments. IC Role / Device Role / Timing Role: Main 5V supply for microcontroller, display, and sensor interface; withstands wide input transients from Li-ion or alkaline sources. Use Value: 6–25 V input range accommodates 2–4 cell battery packs; thermal shutdown protects against enclosure overheating during extended operation. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V rail generation in multi-chemistry smart chargers for NiMH, Li-ion, and lead-acid batteries. IC Role / Device Role / Timing Role: Powers charger controller, communication ICs, and status LEDs; coexists with high-current charging paths. Use Value: Cycle-by-cycle current limiting prevents fault propagation during cell mismatch or shorted battery conditions. |
Use Scenario: Local DC-DC conversion in industrial I/O modules, PLC backplanes, and telecom line cards requiring isolated 5V logic rails. IC Role / Device Role / Timing Role: Point-of-load regulator downstream of intermediate bus (e.g., 12 V or 24 V); operates in harsh temperature environments. Use Value: Specified over –40°C to 125°C junction range; fused ground pin improves thermal reliability under sustained 4 A loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1374IS8-5#PBF | Same electrical specs but rated for –40°C to 125°C operating junction temperature (vs. 0°C to 125°C for LT1374CS8-5#PBF) | Required for extended-temperature industrial or automotive under-hood applications | Select when ambient operating temperature exceeds 0°C minimum or long-term reliability at cold start is critical |
| LT3502AEDD-5#PBF | 40V input rating, 500kHz fixed frequency, 5V fixed output, but uses CMOS process and integrated Schottky diode; 3.3A max output | Lacks BOOST pin and external diode requirement; smaller solution size but lower current capability | Prefer for space-constrained designs where 3.3A suffices and higher input voltage margin (up to 40V) is needed |
Compared with LT1374IS8-5#PBF, the LT1374CS8-5#PBF trades extended temperature range for cost and availability in commercial-grade applications; compared with LT3502AEDD-5#PBF, it offers higher output current and bipolar-switch efficiency at the expense of discrete diode layout and BOOST capacitor routing.
Availability
LT1374CS8-5#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1374CS8-5#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 the LT® product family. Linear pioneered high-performance analog and power management ICs with emphasis on precision, efficiency, and robustness.
The LT1374CS8-5#PBF belongs to Linear's monolithic buck regulator product line, designed specifically for high-current, high-efficiency DC-DC conversion in space- and thermally-constrained applications where discrete solutions are impractical.
FAQ
What is the function of the SENSE pin on the LT1374CS8-5#PBF?
The SENSE pin on the LT1374CS8-5#PBF replaces the FB (feedback) pin used in adjustable versions and is internally connected to a precision 5.0 V reference. It must be tied directly to the regulated 5V output to close the control loop. Unlike FB, it does not accept external resistor dividers - this fixed-output configuration simplifies layout and eliminates resistor tolerance errors. The LT1374CS8-5#PBF achieves ±1.2% output accuracy over temperature and line using this dedicated SENSE architecture.
Can the LT1374CS8-5#PBF operate without the BOOST capacitor?
No - the LT1374CS8-5#PBF requires the external BOOST capacitor and diode to function correctly. The BOOST pin supplies elevated drive voltage to the internal NPN switch, enabling saturation and achieving the specified 0.07 Ω on-resistance. Omitting the BOOST network causes the switch to operate in linear mode, increasing conduction loss, reducing efficiency below 75%, and risking thermal failure at >1A loads. The LT1374CS8-5#PBF datasheet specifies mandatory BOOST capacitor sizing based on input voltage and load current.
What is the maximum recommended inductor value for the LT1374CS8-5#PBF?
The LT1374CS8-5#PBF supports inductors from 1.8 µH to 20 µH depending on application requirements. While larger values (e.g., 10–20 µH) reduce output ripple and peak switch current - beneficial for EMI and thermal management - they also decrease maximum achievable load current due to duty-cycle limitations and core saturation margins. For 5V/4.25A operation at VIN = 10V, a 5 µH inductor is optimal; values above 10 µH are recommended only when ripple-sensitive analog circuitry shares the rail or when operating at minimum input voltage (6V) to maintain continuous conduction mode.
Does the LT1374CS8-5#PBF support synchronization to an external clock?
No - the LT1374CS8-5#PBF does not support synchronization. Its SO-8 package includes a SHDN pin, not a SYNC pin. Synchronization capability is reserved for variants marked "-SYNC" (e.g., LT1374CS8-SYNC) or those in TSSOP packages with dedicated SYNC terminals. Attempting to drive a clock signal into the SHDN pin will trigger shutdown, not synchronization. For timing-critical multi-rail systems requiring phase alignment, consider the LT1374CFE-5 or LT1374HVCFE-5 in 16-lead TSSOP with SYNC functionality.
How does the LT1374CS8-5#PBF handle short-circuit conditions?
The LT1374CS8-5#PBF employs dual-layer short-circuit protection: cycle-by-cycle current limiting (trip threshold ≈ 4.5 A) combined with foldback behavior below 1.7 V on the SENSE pin. When output voltage collapses, the device reduces switching frequency by up to 5:1 and lowers peak current limit to <3 A - minimizing power dissipation in both the IC and external diode/inductor. Thermal shutdown activates if junction temperature exceeds 125°C. This coordinated response allows indefinite survival under sustained short-circuit while maintaining safe operating temperatures.
LT1374CS8-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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
LT1374CS8-5#PBF FAQ
1.How can I place an order for LT1374CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CS8-5#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 LT1374CS8-5#PBF reliable?
The price and inventory of LT1374CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1374CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CS8-5#PBF?
LT1374CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CS8-5#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 LT1374CS8-5#PBF?
For technical support, including LT1374CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CS8-5#PBF requirements.
6.How does Aetrix verify that LT1374CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374CS8-5#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 LT1374CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1374CS8-5#PBF?
All LT1374CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CS8-5#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 LT1374CS8-5#PBF part is unused and in its original packaging.
Return procedure for LT1374CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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