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Analog Devices Inc. LT1374CS8-SYNC#TRPBF
- Part No.:
- LT1374CS8-SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374CS8-SYNC#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
LT1374CS8-SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic synchronous step-down switching regulator with integrated 4.5A NPN power switch, fixed 5V output, and dedicated SYNC pin for external clock synchronization. It operates from 6V to 25V input, delivers up to 4.25A at 5V, and features cycle-by-cycle current limiting, thermal shutdown, and 0.07Ω switch on-resistance. Used in portable computers and battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1374CS8-SYNC#TRPBF datasheet, LT1374CS8-SYNC#TRPBF pinout, LT1374CS8-SYNC#TRPBF application, or LT1374CS8-SYNC#TRPBF equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SO-8 package pin functions, confirmed alternative parts with functional differences, and supply-chain support details specific to this -SYNC variant.
Technical Context
The LT1374CS8-SYNC#TRPBF implements current-mode control with an internal 500kHz oscillator, where the SYNC pin replaces SHDN to accept logic-level external clocks from 580kHz to 1MHz. Its bipolar NPN switch uses BOOST-pin-driven saturation to achieve low 0.07Ω on-resistance and >89% efficiency at full load.
It integrates error amplifier transconductance of 2000 µMho, 2.42V internal reference, and dual-threshold shutdown (2.38V UVLO, 0.4V deep shutdown), while maintaining stable operation across –40°C to 125°C junction temperature range in the SO-8 package with fused ground pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500kHz nominal; synchronizable from 580kHz to 1MHz via SYNC pin - enables EMI reduction and multi-rail timing alignment. |
| Output Voltage | Fixed 5V ±1.2% (4.94–5.06V) - eliminates external feedback resistors and simplifies layout for standard logic rail generation. |
| Max Output Current | 4.25A at VOUT = 5V, VIN = 10V, L = 5µH - supports high-current embedded peripherals without external current boosting. |
| Switch On-Resistance | 0.07Ω at ISW = 4.5A - reduces conduction loss to <315mW at full load, enabling thermally constrained PCB designs. |
| Shutdown Current | 20µA max at VIN ≤ 25V - extends battery life in standby mode for portable equipment. |
| Input Voltage Range | 6V to 25V - compatible with 12V industrial rails and wide-range battery inputs (e.g., 2S–6S Li-ion). |
| Thermal Shutdown | Active at TJ ≥ 125°C - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
LT1374CS8-SYNC#TRPBF is housed in an 8-lead plastic SO (S8) package with fused ground pin (FGND) for enhanced thermal performance (θJA = 80°C/W with FGND connected to ground plane). The package includes exposed copper pad under the die for improved heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input voltage supply and collector of internal NPN switch | Must be bypassed with low-ESR capacitor near pin; handles high dI/dt edges - trace inductance directly impacts VCE stress and EMI. |
| BOOST | Boost capacitor drive node for NPN saturation | Requires external diode + capacitor to generate ~VIN+5V; enables 0.07Ω RON and >89% efficiency at high VIN/VOUT ratios. |
| FGND | Fused ground connection (pin 3) | Must be soldered to large copper area; primary return path for switch current - critical for thermal management and load regulation. |
| VSW | Emitter of internal NPN switch | Drives external catch diode; swings negative during off-time - clamped to ≥ –0.8V to prevent diode reverse breakdown. |
| VC | Error amplifier output / current limit threshold input | Used for loop compensation; voltage ranges from ~1V (light load) to ~2V (full load); can override current limit by pulling below 0.9V. |
| BIAS | External bias supply input (3.3V–7V) | When tied to regulated 5V output, shifts internal bias current from VIN to BIAS - improves efficiency by >10% at VIN = 20V. |
| SYNC | External clock synchronization input | Replaces SHDN function; accepts 10–90% duty-cycle logic signal; locks internal oscillator to external source - eliminates beat frequencies in multi-regulator systems. |
| SENSE | Output voltage sensing input (fixed 5V mode) | Connected directly to 5V output; 5.0V ±1.2% threshold sets regulation point - no external divider required. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronizable 500kHz oscillator | Enables deterministic multi-rail timing and EMI spectrum spreading - avoids interference in noise-sensitive analog or RF subsystems. |
| Integrated 4.5A NPN power switch | Eliminates external MOSFET and gate driver - reduces BOM count and layout area while maintaining high peak-current capability. |
| BOOST-driven saturation architecture | Reduces switch conduction loss by 60% vs conventional bipolar designs - achieves >89% efficiency at 4A load with 12V input. |
| Cycle-by-cycle current limiting | Prevents switch destruction during short-circuit or startup inrush - limits peak current to 4.5A regardless of output loading. |
| Thermal shutdown with hysteresis | Shuts down at 125°C junction and restarts at ~115°C - prevents thermal runaway in sealed enclosures without external thermal sensors. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Powering CPU I/O, USB controllers, and display interface ICs in ultra-thin notebooks with limited board space and thermal headroom. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated rail from single-cell or multi-cell Li-ion battery pack (8–24V). Use Value: Fixed 5V output eliminates resistor network; 0.07Ω RON minimizes heat rise in confined chassis; SYNC pin aligns switching with system clock to suppress conducted EMI. |
Use Scenario: Supplying motor drivers, sensors, and microcontrollers in handheld test equipment operating from rechargeable 3S Li-ion packs. IC Role / Device Role / Timing Role: Main system power stage converting 9–25V battery voltage to stable 5V for mixed-signal subsystems. Use Value: 20µA shutdown current extends runtime in sleep mode; BOOST architecture maintains >85% efficiency even at 20V input; thermal shutdown prevents field failures during extended use. |
| Battery Chargers | Distributed Power |
Use Scenario: Generating isolated 5V auxiliary rail in multi-port USB-C PD chargers to power MCU, communication ICs, and status LEDs. IC Role / Device Role / Timing Role: Secondary-side non-isolated buck regulator fed from intermediate bus (12V or 19V). Use Value: SO-8 package with fused ground enables compact layout on dense charger PCBs; SYNC pin allows synchronization with primary-side controller to reduce transformer acoustic noise. |
Use Scenario: Local 5V regulation for FPGA I/O banks, Ethernet PHYs, and PMICs in telecom line cards with distributed 12V or 24V backplane supplies. IC Role / Device Role / Timing Role: Point-of-load (POL) converter providing low-noise, tightly regulated 5V from shared intermediate bus. Use Value: Current-mode control ensures fast transient response to FPGA I/O switching; 4.25A output supports burst-mode loads; thermal shutdown protects against airflow blockage in rack-mounted systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EMS#TRPBF | 4-phase, 30V input, 0.6V–5V adjustable output; requires external MOSFETs; 94% efficiency at 5V/10A | Higher current, multi-phase capability; suited for >6A loads and tighter output ripple requirements | Select when scaling beyond 4.25A or needing programmable output voltage; not drop-in due to different topology and pinout. |
| MP2307DN-LF-Z | 3A, 23V input, fixed 5V output; SO-8 package; 0.12Ω RDS(on); no SYNC pin; 100µA quiescent current | Lower cost, lower current, no synchronization capability; simpler BOM but less robust under fault conditions | Select for cost-sensitive, lower-power applications where EMI synchronization is unnecessary and 3A output suffices. |
Compared with LTC3850EMS#TRPBF and MP2307DN-LF-Z, the LT1374CS8-SYNC#TRPBF uniquely balances integrated 4.5A switching, fixed 5V simplicity, and precise external clock synchronization - making it optimal for mid-power, noise-sensitive, space-constrained 5V POL applications where thermal margin and timing control are critical.
Availability
LT1374CS8-SYNC#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 authentic sourcing.
Supply support for LT1374CS8-SYNC#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 product support, documentation, and manufacturing continuity for the LT family of high-performance power management ICs.
The LT1374 product line was designed for high-efficiency, high-current step-down conversion in space- and thermally constrained applications - emphasizing integrated power switches, current-mode stability, and robust protection features for industrial and portable systems.
FAQ
What is the maximum input voltage rating for the LT1374CS8-SYNC#TRPBF?
The LT1374CS8-SYNC#TRPBF has an absolute maximum input voltage rating of 25V. Operation above this level risks permanent damage to the internal NPN switch and control circuitry. For reliable long-term use, the recommended operating input range is 6V to 25V, with derating advised above 22V under high-temperature conditions. The BOOST pin supports up to 38V, but only when referenced to VIN - not as a standalone supply.
Does the LT1374CS8-SYNC#TRPBF require an external catch diode?
Yes, the LT1374CS8-SYNC#TRPBF requires an external Schottky catch diode (e.g., MBRS330T3) connected between VSW and GND. Unlike synchronous buck converters, it uses an NPN switch with open-emitter configuration, so the diode provides the freewheeling path during switch-off. The diode's forward voltage and reverse recovery characteristics directly impact efficiency and thermal performance - low VF and fast recovery are essential.
How does the SYNC pin function on the LT1374CS8-SYNC#TRPBF?
The SYNC pin on the LT1374CS8-SYNC#TRPBF replaces the SHDN pin found on non-SYNC variants and accepts logic-level TTL/CMOS signals (10–90% duty cycle) to synchronize the internal 500kHz oscillator across a range of 580kHz to 1MHz. It is not a clock input in the strict sense - rather, it modulates the oscillator frequency to lock to the external signal, eliminating beat frequencies and reducing EMI in multi-regulator systems.
What is the purpose of the BOOST pin on the LT1374CS8-SYNC#TRPBF?
The BOOST pin on the LT1374CS8-SYNC#TRPBF drives an external bootstrap capacitor and diode to generate a voltage ~5V above VIN, which saturates the internal NPN power switch. This reduces effective on-resistance to 0.07Ω and increases efficiency from ~75% (conventional bipolar) to >89%. Without proper BOOST circuit implementation, the switch operates in linear mode, causing excessive heat and potential thermal shutdown.
Can the LT1374CS8-SYNC#TRPBF operate without the BIAS pin connected?
Yes, the LT1374CS8-SYNC#TRPBF operates normally with the BIAS pin left unconnected or floating. In that case, internal bias circuitry draws current from VIN. Connecting BIAS to the regulated 5V output (≥3.3V) improves efficiency by >10% at high input voltages (e.g., VIN = 20V), as it shifts bias current from the higher-voltage input rail to the lower-voltage output rail - reducing overall power dissipation and thermal load.
LT1374CS8-SYNC#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 21.5V
- 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-SYNC#TRPBF FAQ
1.How can I place an order for LT1374CS8-SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CS8-SYNC#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-SYNC#TRPBF reliable?
The price and inventory of LT1374CS8-SYNC#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-SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374CS8-SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CS8-SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CS8-SYNC#TRPBF?
LT1374CS8-SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CS8-SYNC#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-SYNC#TRPBF?
For technical support, including LT1374CS8-SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CS8-SYNC#TRPBF requirements.
6.How does Aetrix verify that LT1374CS8-SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374CS8-SYNC#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-SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374CS8-SYNC#TRPBF?
All LT1374CS8-SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CS8-SYNC#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-SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LT1374CS8-SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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