My Inquiry
My Account
Analog Devices Inc. LT1374CS8-5SYNC#TRPBF
- Part No.:
- LT1374CS8-5SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374CS8-5SYNC#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,571
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1374CS8-5SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A synchronous step-down switching regulator in an 8-pin SOIC package with integrated 500kHz oscillator and external synchronization capability. It features 0.07Ω switch on-resistance, 2.5mA quiescent current, cycle-by-cycle current limiting, and operates from 6V to 25V input. Designed for high-efficiency power conversion in space-constrained battery-powered systems.
For engineers reviewing the LT1374CS8-5SYNC#TRPBF datasheet, LT1374CS8-5SYNC#TRPBF pinout, LT1374CS8-5SYNC#TRPBF application, or LT1374CS8-5SYNC#TRPBF equivalent, key selection considerations include its fixed 5V output, SYNC-enabled frequency coordination, thermal shutdown protection, 4.5A peak switch current rating, and compatibility with standard surface-mount inductors down to 1.8µH.
Technical Context
The LT1374CS8-5SYNC#TRPBF implements current-mode control with a 500kHz fixed-frequency oscillator, enabling fast transient response and stable loop behavior. Its internal NPN power switch is driven via a BOOST pin to achieve saturation, reducing conduction loss to that of a 0.07Ω FET structure.
Synchronization is achieved through a logic-compatible SYNC pin (replacing SHDN), supporting external clock signals from 580kHz to 1MHz. The device uses a SENSE pin (not FB) for fixed 5V regulation, with a nominal 5.0V ±1.2% sense threshold and built-in foldback protection below 1V on the SENSE pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (SENSE pin referenced; no external divider required) |
| Max Output Current | 4.25A continuous at VOUT=5V, VIN=10V, L=5µH (derates with duty cycle & inductor size) |
| Switch On-Resistance | 0.07Ω typical at 4.5A - enables >89% efficiency vs. ~75% in conventional bipolar designs |
| Switching Frequency | 500kHz nominal; synchronizable from 580kHz to 1MHz via SYNC pin |
| Quiescent Supply Current | 2.5mA typical - supports high light-load efficiency without BIAS pin connection |
| Shutdown Current | 20µA max - enables ultra-low-power standby mode |
| Input Voltage Range | 6V to 25V - validated minimum start-up voltage is 5.5V at 5V output |
| Thermal Protection | Internal thermal shutdown - automatically disables switching above TJ = 125°C |
Pinout & Package
LT1374CS8-5SYNC#TRPBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad for thermal enhancement. Pin 1 is marked with a dot; pins are numbered counterclockwise. The package supports θJA = 80°C/W when FGND is fused to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and switch collector | Accepts 6–25V; powers internal circuitry; requires low-inductance bypass capacitor adjacent to pin |
| BOOST | Switch driver boost supply | Must be ≥VIN + 5V; enables NPN saturation; drives external boost capacitor/diode network |
| FGND | Fused ground reference | Primary GND return for feedback and regulation; must connect directly to ground plane for load regulation |
| VSW | Switch emitter output | Drives external inductor; swings from near 0V to VIN during operation; clamped to –0.8V min |
| VC | Error amplifier output / current limit setpoint | Used for loop compensation; also serves as current clamp input; 0.9V–2.1V operating range |
| BIAS | Efficiency-boosting bias supply | Optional connection to regulated output (≥3.3V); reduces VIN supply current and improves efficiency at high VIN |
| SYNC | External oscillator synchronization input | Replaces SHDN function; TTL/CMOS compatible; 580kHz–1MHz sync range; 1.5–2.2V threshold |
| SENSE | Fixed 5V output sensing node | Connected directly to 5V output; 5.0V ±1.2% threshold; enables foldback protection below 1V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500kHz oscillator | Eliminates external timing components; ensures consistent switching frequency across temperature and line |
| BOOST-driven saturated NPN switch | Reduces conduction loss to 0.07Ω; achieves >89% efficiency at full load vs. 75% in non-boosted designs |
| SYNC pin for system-level clock alignment | Enables noise reduction in multi-regulator systems by eliminating beat frequencies; no PCB layout change needed to enable |
| SENSE-based fixed 5V regulation | Removes need for external resistor divider; improves accuracy and stability; simplifies BOM and layout |
| Cycle-by-cycle current limiting | Guarantees 4.5A peak switch current limit; prevents damage during overload or short-circuit conditions |
| Thermal shutdown + UVLO | Protects against junction overheating (TJ > 125°C) and input undervoltage (SHDN threshold = 2.38V) |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded controllers and peripherals in clamshell laptops and tablets. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying CPU I/O, USB PHY, and display interface circuits. Use Value: High 4.5A current capability supports burst-mode loads; 500kHz switching allows compact 1.8µH inductor; SYNC enables EMI reduction alongside other system clocks. |
Use Scenario: Power management in handheld test equipment, portable medical monitors, and ruggedized field instruments. IC Role / Device Role / Timing Role: Main 5V rail generator from Li-ion or multi-cell alkaline inputs (6–25V). Use Value: 20µA shutdown current extends battery life; thermal shutdown protects during enclosure overheating; BOOST architecture maintains efficiency across wide input range. |
| Battery Chargers | Distributed Power |
Use Scenario: Secondary-side 5V supply for charging controller ICs, status LEDs, and communication interfaces in smart chargers. IC Role / Device Role / Timing Role: Isolated auxiliary power stage delivering regulated 5V to microcontroller and CAN/USB transceivers. Use Value: Fixed 5V SENSE interface eliminates calibration drift; cycle-by-cycle current limiting handles charger fault transients; SOIC-8 footprint fits tight board areas. |
Use Scenario: Local point-of-load (POL) conversion in telecom line cards, industrial PLC modules, and distributed sensor nodes. IC Role / Device Role / Timing Role: Standalone 5V POL regulator fed from intermediate 12V or 24V backplane rails. Use Value: SYNC capability aligns switching edges with master clock to suppress conducted EMI; 80°C/W thermal resistance enables operation without heatsink in 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3632EMSE-5#TRPBF | Monolithic 5V buck with 3.5A rating, 3MHz switching, no SYNC pin, integrated MOSFETs | Higher frequency enables smaller LC components but lower current; lacks synchronization for noise-sensitive multi-rail systems | Select when board area is critical and SYNC is unnecessary; not drop-in due to different pinout and control scheme |
| TPS54560QDGQRQ1 | Automotive-grade 60V-input buck with 5A rating, adjustable output, SYNC capability, and wider temp range (–40°C to 150°C) | Requires external feedback resistors for 5V; higher VIN range adds cost and complexity for 25V-max applications | Choose for AEC-Q100 compliance or >25V input; pinout and compensation differ - redesign required |
Compared with LTC3632EMSE-5#TRPBF and TPS54560QDGQRQ1, the LT1374CS8-5SYNC#TRPBF delivers higher peak current (4.5A vs. 3.5A/5A), fixed 5V simplicity, and proven BOOST architecture for high efficiency at medium frequency - making it optimal for cost-sensitive, thermally constrained 6–25V industrial and portable designs where synchronization is essential.
Availability
LT1374CS8-5SYNC#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1374CS8-5SYNC#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 full technical and manufacturing continuity for the LT® product family. Linear pioneered high-performance analog and power ICs with emphasis on precision, reliability, and ease of use.
The LT1374 series was designed specifically for high-current, medium-frequency DC/DC conversion in space- and thermal-constrained applications - emphasizing integrated BOOST architecture, synchronization readiness, and robust protection features for industrial and portable end equipment.
FAQ
What is the exact output voltage tolerance of the LT1374CS8-5SYNC#TRPBF?
The LT1374CS8-5SYNC#TRPBF provides a fixed 5.0V output with a tolerance of ±1.2% over temperature and line, as specified by the SENSE pin threshold of 4.94V to 5.06V (typical 5.0V). This is tighter than general-purpose regulators and eliminates resistor-divider drift errors inherent in adjustable versions.
Does the LT1374CS8-5SYNC#TRPBF require an external boost capacitor?
Yes, the LT1374CS8-5SYNC#TRPBF requires an external boost capacitor (typically 10nF–100nF ceramic) connected between BOOST and VSW pins. This capacitor supplies the extra voltage needed to saturate the internal NPN switch - without it, the switch operates in linear mode, increasing losses and reducing efficiency below 80%.
Can the LT1374CS8-5SYNC#TRPBF operate without the BIAS pin connected?
Yes, the LT1374CS8-5SYNC#TRPBF functions fully without BIAS pin connection. Internal bias is drawn from VIN. Connecting BIAS to the regulated 5V output improves efficiency by ~10% at high input voltages (e.g., VIN = 20V), but it is optional and not required for basic operation or startup.
What is the minimum recommended inductor value for the LT1374CS8-5SYNC#TRPBF?
The minimum recommended inductor is 1.8µH for standard operation, as confirmed in the datasheet's "Inductor Size Reduced to 1.8µH" feature. For loads above 3.5A, increase to 10µH; above 4A, use 20µH. Lower values risk discontinuous conduction and increased ripple, but the LT1374CS8-5SYNC#TRPBF remains stable down to 1.2µH per application notes.
How does the SYNC function interact with the shutdown capability in the LT1374CS8-5SYNC#TRPBF?
The LT1374CS8-5SYNC#TRPBF replaces the SHDN pin with SYNC - meaning it does not support hardware shutdown. To disable regulation, drive VC to ground or disconnect the BOOST supply. SYNC accepts 580kHz–1MHz logic-level signals; applying a signal outside this range has no effect, and the part continues normal 500kHz operation.
LT1374CS8-5SYNC#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
LT1374CS8-5SYNC#TRPBF FAQ
1.How can I place an order for LT1374CS8-5SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CS8-5SYNC#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 LT1374CS8-5SYNC#TRPBF reliable?
The price and inventory of LT1374CS8-5SYNC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CS8-5SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374CS8-5SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CS8-5SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CS8-5SYNC#TRPBF?
LT1374CS8-5SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CS8-5SYNC#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 LT1374CS8-5SYNC#TRPBF?
For technical support, including LT1374CS8-5SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CS8-5SYNC#TRPBF requirements.
6.How does Aetrix verify that LT1374CS8-5SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374CS8-5SYNC#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 LT1374CS8-5SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374CS8-5SYNC#TRPBF?
All LT1374CS8-5SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CS8-5SYNC#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 LT1374CS8-5SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LT1374CS8-5SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1374CS8-5SYNC#TRPBF 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…
