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Analog Devices Inc. LT1374CS8-5#TRPBF
- Part No.:
- LT1374CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374CS8-5#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,561
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Product details
Overview
LT1374CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A monolithic buck switching regulator in an 8-pin SOIC package. It operates at a constant 500kHz switching frequency, features cycle-by-cycle current limiting, 0.07Ω switch on-resistance, and 2.5mA typical quiescent supply current. It delivers regulated 5V output from 6V–25V input for high-efficiency point-of-load conversion in portable computing and battery-powered systems.
For engineers reviewing the LT1374CS8-5#TRPBF datasheet, LT1374CS8-5#TRPBF pinout, LT1374CS8-5#TRPBF application, or LT1374CS8-5#TRPBF equivalent, this page provides verified functional identity, validated SO-8 pin mapping, confirmed 5V fixed-output behavior, thermal shutdown and short-circuit protection details, and real-world design constraints including boost capacitor requirements and inductor sizing guidance.
Technical Context
The LT1374CS8-5#TRPBF 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 BOOST pin to achieve saturation, enabling low 0.07Ω on-resistance and >89% efficiency at full load. The device uses slope compensation to prevent subharmonic oscillation above 50% duty cycle.
It integrates oscillator, error amplifier (2000 µMho transconductance), current sense amplifier, and dual-threshold shutdown circuitry (2.38V UVLO, 0.4V deep shutdown). The SO-8 package includes fused ground (FGND) for improved thermal performance (θJA = 80°C/W), and supports optional synchronization (via SHDN/SYNC pin) up to 1MHz when configured as -SYNC variant - though LT1374CS8-5#TRPBF uses SHDN only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (4.94V–5.06V) - no external feedback divider required; SENSE pin connects directly to output. |
| Switch Current Limit | 4.5A typical (min 4.5A, max 8.5A) - cycle-by-cycle limiting protects against overload; derates above 50% duty cycle. |
| Switching Frequency | 500kHz ±8% (460–540kHz) - constant frequency enables predictable EMI filtering and small external components. |
| Input Voltage Range | 6V to 25V - minimum start-up voltage is 5.5V; requires BOOST ≥2.3V above VIN for full switch saturation. |
| Quiescent Supply Current | 2.5mA typical - measured at VIN with BIAS unconnected; drops to 20µA in shutdown mode. |
| Thermal Protection | Internal thermal shutdown - activates at TJ = 125°C; automatic recovery after cooldown. |
| Package | 8-lead plastic SO (S8) with fused ground (FGND) - θJA = 80°C/W with FGND tied to ground plane. |
Pinout & Package
LT1374CS8-5#TRPBF is housed in an 8-lead plastic SOIC (S8) package with fused ground (FGND) pin for enhanced thermal dissipation. The FGND pin must be soldered to a large copper area or ground plane to maintain θJA ≤ 80°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power collector | Supplies internal circuitry and powers NPN switch collector; bypass capacitor must be placed adjacent to minimize dI/dt spikes. |
| BOOST | Switch drive voltage booster | Connected to external capacitor-diode network; provides ~5V above VIN to saturate NPN switch and reduce conduction loss. |
| FGND | Fused ground reference | Primary ground return for output regulation and thermal path; must be connected to PCB ground plane for thermal and load regulation integrity. |
| VSW | Switch emitter node | Drives external catch diode and inductor; swings negative during off-time (clamped to –0.8V max); both VSW pins in TSSOP are paralleled - not applicable here. |
| VC | Error amplifier output | Controls peak switch current; used for loop compensation; voltage ranges from ~1V (light load) to ~2V (full load); clamp limits at 0.9V/2.1V. |
| BIAS | Efficiency-boost bias supply | Accepts external 3–7V (e.g., regulated 5V output); reduces VIN supply current and improves efficiency at high VIN/light load. |
| SHDN | Shutdown control input | Two-threshold logic: 2.38V disables switching (UVLO), 0.4V forces micropower shutdown (20µA IQ). |
| SENSE | Fixed-output voltage sense | Replaces FB pin in -5 variants; connected directly to 5V output; monitors regulation and triggers foldback below 1.7V. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response and inherent loop stability without external compensation; eliminates need for type-II/III networks in most cases. |
| Saturating NPN switch | 0.07Ω on-resistance achieved via BOOST-driven saturation - reduces conduction loss vs. conventional bipolar designs and matches FET-level efficiency. |
| Integrated protection | Full cycle-by-cycle current limiting + thermal shutdown + undervoltage lockout (2.38V) - eliminates need for external fault management circuitry. |
| Frequency foldback | Reduces switching frequency 5:1 when SENSE < 1V - limits power dissipation in IC, diode, and inductor during short-circuit conditions. |
| Low-noise BIAS option | BIAS pin allows internal bias circuitry to draw current from regulated output instead of VIN - improves efficiency by >10% at VIN = 20V, VOUT = 5V, IOUT = 25mA. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Point-of-load DC/DC conversion for CPU core or peripheral rails in laptops and tablets. IC Role / Device Role / Timing Role: Fixed 5V buck regulator delivering up to 4.25A with tight load regulation and fast transient response. Use Value: Enables compact layout using 1.8µH inductor and all-SMT components; 2.5mA quiescent current extends battery runtime in standby. |
Use Scenario: Power management in handheld test equipment, medical monitors, and portable instrumentation. IC Role / Device Role / Timing Role: Primary 5V supply from Li-ion or multi-cell alkaline batteries (6–25V input range). Use Value: Built-in UVLO prevents brownout operation; shutdown mode draws only 20µA, preserving battery charge during sleep intervals. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V rail generation in multi-chemistry battery charging systems with variable input due to adapter or solar source. IC Role / Device Role / Timing Role: Regulated 5V source for charger controller ICs, display, and communication interfaces. Use Value: Wide 6–25V input accommodates fluctuating sources; BOOST-assisted saturation maintains >89% efficiency across load range. |
Use Scenario: Local 5V regulation in industrial PLCs, telecom line cards, or distributed sensor nodes with centralized 12–24V backplane. IC Role / Device Role / Timing Role: High-current, thermally robust buck converter with fused ground for reliable long-term operation. Use Value: FGND pin and SO-8 thermal design support continuous 4.5A delivery without derating in convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | 5V fixed, 5A, 260kHz, SO-8; higher dropout, no BOOST pin, higher RDS(on) (~0.15Ω), no BIAS pin. | Lacks BOOST-assisted saturation and BIAS efficiency boost; lower switching frequency requires larger inductor (≥15µH vs. 1.8µH). | Choose for cost-sensitive, non-compact designs where 260kHz EMI profile is preferred and efficiency at light load is secondary. |
| TPS54560DGQ | 5V adjustable (requires resistor divider), 5A, 100–2500kHz programmable, MSOP-10; integrated high-side MOSFET, no external BOOST needed. | Requires external feedback resistors; lacks fixed-5V SENSE pin simplicity; offers wider frequency tuning but more complex compensation. | Choose when design flexibility (adjustable VOUT, sync capability, soft-start) outweighs the benefit of plug-and-play 5V regulation and minimal BOM count. |
Compared with LM2678-5.0/NOPB, LT1374CS8-5#TRPBF delivers higher efficiency at high input voltages via BOOST and BIAS pins; compared with TPS54560DGQ, it eliminates feedback resistors and simplifies layout for fixed 5V use - but lacks programmability and integrated MOSFET gate drive.
Availability
LT1374CS8-5#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-lifecycle assurance, and traceable sourcing for industrial and medical end equipment.
Supply support for LT1374CS8-5#TRPBF 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 high-performance analog and power management portfolio. Linear pioneered monolithic switching regulators with integrated power switches and advanced protection features.
The LT1374 product line was designed for high-efficiency, high-current step-down conversion in space-constrained, thermally demanding applications - emphasizing low-component-count solutions with fixed and adjustable output variants in multiple packages.
FAQ
What is the exact output voltage tolerance of the LT1374CS8-5#TRPBF?
The LT1374CS8-5#TRPBF delivers a fixed 5.0V output with a guaranteed tolerance of ±1.2%, corresponding to 4.94V to 5.06V across temperature and line conditions. This specification is measured at the SENSE pin under full load and nominal input voltage, and reflects the internal 5.0V reference accuracy - no external resistors affect this value since the feedback divider is integrated on-die.
Can the LT1374CS8-5#TRPBF operate without the BOOST capacitor?
No - the LT1374CS8-5#TRPBF requires the external BOOST capacitor and diode (e.g., MBRS330T3) to function correctly. Without BOOST, the internal NPN switch cannot saturate, resulting in excessive conduction loss (≈1.5V drop), thermal runaway, and failure to regulate. The BOOST pin must be held ≥2.3V above VIN to guarantee full saturation and 0.07Ω effective on-resistance.
What is the maximum continuous output current the LT1374CS8-5#TRPBF can deliver at 12V input?
At VIN = 12V and VOUT = 5V, the duty cycle is 41.7%, well below 50%. Therefore, the LT1374CS8-5#TRPBF supports its full 4.5A switch current rating. Accounting for inductor ripple (e.g., 1.8µH), maximum continuous output current is approximately 4.25A in continuous conduction mode - verified in the Typical Application Circuit (1374 TA01) and Efficiency vs Load Current graph (1374 TA02).
Does the LT1374CS8-5#TRPBF support synchronization to an external clock?
No - the LT1374CS8-5#TRPBF uses the SHDN pin for shutdown control and does not include synchronization capability. Synchronization is only available on variants marked "-SYNC" (e.g., LT1374CS8-SYNC), where the SHDN pin is replaced by SYNC. Attempting to drive an external clock signal into the SHDN pin of LT1374CS8-5#TRPBF will trigger unintended shutdown.
How does the SENSE pin differ from the FB pin in LT1374 variants?
In the LT1374CS8-5#TRPBF, the SENSE pin replaces the FB pin found on adjustable versions. It connects directly to the 5V output and serves three functions: (1) closed-loop regulation using the internal 5.0V reference, (2) activation of current limit foldback when voltage drops below 1.7V, and (3) initiation of frequency foldback below 1.0V. Unlike FB, SENSE requires no external resistor divider and has no input bias current path.
LT1374CS8-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1374CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CS8-5#TRPBF 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#TRPBF reliable?
The price and inventory of LT1374CS8-5#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CS8-5#TRPBF?
LT1374CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CS8-5#TRPBF 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#TRPBF?
For technical support, including LT1374CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1374CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374CS8-5#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374CS8-5#TRPBF?
All LT1374CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CS8-5#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1374CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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