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Analog Devices Inc. LT1374IS8-5SYNC#PBF
- Part No.:
- LT1374IS8-5SYNC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374IS8-5SYNC#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,513
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Product details
Overview
LT1374IS8-5SYNC#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A, 500kHz monolithic synchronous step-down switching regulator in SO-8 package with integrated NPN power switch, current-mode control, and external synchronization capability. It delivers up to 4.25A at 5V output from 6V–25V input, features 0.07Ω switch on-resistance, 2.5mA quiescent supply current, and cycle-by-cycle current limiting. Used in portable computers and battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1374IS8-5SYNC#PBF datasheet, LT1374IS8-5SYNC#PBF pinout, LT1374IS8-5SYNC#PBF application, or LT1374IS8-5SYNC#PBF equivalent, key selection criteria include fixed 5V output configuration, SYNC pin for external clock synchronization (580kHz–1MHz range), thermal shutdown, undervoltage lockout (2.38V), and compatibility with standard surface-mount inductors down to 1.8µH.
Technical Context
The LT1374IS8-5SYNC#PBF implements constant-frequency current-mode control using an internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the SENSE pin. Its bipolar NPN switch is driven via BOOST pin voltage (≥VIN + 5V) to achieve saturation and low conduction loss.
Synchronization replaces the SHDN function on this variant: applying a logic-level signal (10%–90% duty cycle) to the SYNC pin shifts operating frequency from nominal 500kHz up to 1MHz, enabling noise spectrum management and multi-regulator phase alignment. The SENSE pin is internally tied to the 5V output and monitors regulated voltage with ±1% accuracy (4.94V–5.06V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1% (SENSE pin internally connected; no external divider required) |
| Switch Current Limit | 4.5A typical (cycle-by-cycle limiting; drops under short-circuit foldback) |
| Switch On Resistance | 0.07Ω (enables high efficiency >89% at 5V/2A with VIN=10V) |
| Operating Frequency | 500kHz nominal; synchronizable from 580kHz to 1MHz via SYNC pin |
| Input Voltage Range | 6V to 25V (minimum start-up VIN = 5.5V; UVLO threshold = 2.38V on SHDN/SYNC) |
| Quiescent Supply Current | 2.5mA (VIN supply current with BIAS pin open; excludes boost capacitor leakage) |
| Shutdown Current | 20µA (achieved when SYNC/SHDN pin voltage ≤0.37V) |
Pinout & Package
LT1374IS8-5SYNC#PBF is housed in an 8-lead plastic SOIC (SO-8) package with exposed pad for thermal enhancement. Pin 1 is marked with dot; pinout follows standard SO-8 layout with dual ground (pins 3 and 4), dedicated SYNC (pin 7), and SENSE (pin 8) replacing FB for fixed 5V operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input / switch collector | Supplies internal circuitry and powers NPN switch collector; requires local 100µF solid tantalum bypass |
| BOOST (Pin 2) | Switch drive boost supply | Must be ≥VIN + 5V (min 2.3V above VIN); drives external boost capacitor/diode to saturate NPN switch |
| GND (Pin 3) | Signal and power ground reference | Reference for SENSE, VC, and error amplifier; must connect directly to load ground to avoid regulation error |
| GND (Pin 4) | Secondary ground path | Reduces ground loop impedance; both GND pins must be tied to same low-inductance ground plane |
| VSW (Pin 5) | Switch emitter / inductor node | Drives external catch diode (e.g., MBRS330T3); clamped to –0.8V max during off-time |
| VC (Pin 6) | Error amplifier output / current limit setpoint | Controls peak switch current; used for loop compensation (typical 1V–2V swing); can override shutdown |
| SYNC (Pin 7) | External clock synchronization input | Replaces SHDN function; TTL/CMOS-compatible (1.5V–2.2V threshold); enables frequency shift up to 1MHz |
| SENSE (Pin 8) | Fixed 5V output feedback | Internally connected to 5V output; monitors regulation at ±1% accuracy; enables foldback protection below 1V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with internal resistor divider | Eliminates external feedback network; reduces BOM count and layout sensitivity |
| External synchronization capability | Enables EMI reduction and multi-rail phase alignment without changing PCB layout |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting and fast transient response (<10µs to 1% regulation) |
| BOOST-driven saturated NPN switch | Achieves 0.07Ω effective RCE(sat), improving efficiency over conventional bipolar designs by >14% |
| Integrated short-circuit and thermal protection | Full cycle-by-cycle current limiting plus thermal shutdown prevents damage during sustained overload |
Applications
| Portable Computing Power Rails | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Generating stable 5V supply for microcontrollers, ADCs, and sensors in handheld test equipment powered by Li-ion batteries (7.2V–12.6V). IC Role / Device Role / Timing Role: Primary buck regulator delivering up to 4.25A at 5V with tight load regulation (<±1%) across 0–4A load range. Use Value: Maintains system uptime during battery voltage sag (down to 6V input) while sustaining >87% efficiency at 2A load. |
Use Scenario: Powering low-noise analog front-ends and precision DACs in portable medical devices where EMI must be minimized near sensitive signal paths. IC Role / Device Role / Timing Role: Synchronized 500kHz–1MHz buck converter aligned with system clock to avoid beat frequencies in audio band. Use Value: Enables deterministic noise placement outside critical 20Hz–20kHz band via SYNC pin, reducing conducted emissions by >15dB. |
| Industrial Battery Chargers | Distributed Power Architectures |
Use Scenario: Providing isolated 5V bias for gate drivers and communication ICs in multi-cell LiFePO₄ battery charging modules with 12V–24V input bus. IC Role / Device Role / Timing Role: High-reliability DC/DC stage with thermal shutdown and UVLO (2.38V) preventing startup under weak battery conditions. Use Value: Survives 1000+ thermal cycles with no parameter drift due to robust SO-8 thermal design (θJA = 80°C/W with fused ground). |
Use Scenario: Local point-of-load regulation for FPGA I/O banks in modular industrial controllers using 12V or 24V backplane distribution. IC Role / Device Role / Timing Role: Compact 5V/4.25A regulator placed adjacent to load to minimize IR drop and improve dynamic response. Use Value: Achieves <50mV output deviation during 3A step load transients (200ns rise time) due to current-mode control and low-ESR output cap support. |
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 |
|---|---|---|---|
| LTC3631EMSE-5#PBF | Monolithic 5V buck with 3.5A rating, 3MHz switching, integrated MOSFETs; no SYNC pin; requires external compensation | Higher frequency enables smaller inductors (1.5µH), but lacks synchronization for noise-sensitive systems | Select when board space is constrained and EMI filtering is prioritized over multi-rail coordination |
| TPS54560QDGQRQ1 | Automotive-grade 5V buck (4.5A), 100kHz–2.5MHz adjustable frequency, integrated FETs, enable/sync pin shared | Wider sync range (100kHz–2.5MHz) and AEC-Q100 qualification; higher minimum input (3.5V) | Select for automotive or harsh-environment use where extended temperature range (–40°C to 125°C) and qualification are mandatory |
Compared with LTC3631EMSE-5#PBF and TPS54560QDGQRQ1, the LT1374IS8-5SYNC#PBF offers unique combination of bipolar-switch efficiency at 500kHz, guaranteed 5V accuracy without trimming, and dedicated SYNC functionality - making it optimal for industrial and portable systems requiring deterministic frequency control and proven reliability over wide input ranges.
Availability
LT1374IS8-5SYNC#PBF is available at Aetrix Electronics and suitable for portable computing power rails, battery-powered instrumentation, industrial battery chargers, and distributed power architectures requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1374IS8-5SYNC#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 technical and manufacturing continuity for the LT® product family. Linear pioneered high-performance analog ICs with emphasis on power management, precision signal conditioning, and robust industrial interfaces.
The LT1374 series was designed specifically for high-efficiency, medium-power DC/DC conversion in space-constrained applications where thermal performance, EMI control, and reliable short-circuit protection are critical - especially in portable and battery-operated systems.
FAQ
What is the maximum continuous output current for LT1374IS8-5SYNC#PBF at 5V output?
The LT1374IS8-5SYNC#PBF supports up to 4.25A continuous output current at 5V when VIN = 10V and ambient temperature is ≤60°C with adequate PCB copper area. At higher input voltages (e.g., VIN = 25V), maximum load current decreases to ~3.5A due to increased inductor ripple and thermal constraints. Derating curves in the datasheet confirm 4.25A is validated for VOUT = 5V, L = 5µH, and COUT = 100µF solid tantalum.
Can LT1374IS8-5SYNC#PBF operate without the BOOST capacitor and diode?
No. The LT1374IS8-5SYNC#PBF requires the external BOOST capacitor and Schottky diode (e.g., CMDSH3) to generate the boosted gate drive voltage needed to saturate the internal NPN switch. Omitting the BOOST network causes the switch to operate in linear mode, increasing conduction loss dramatically and risking thermal shutdown. The BOOST pin must be held ≥VIN + 5V during switch-on time to maintain 0.07Ω effective on-resistance.
How does the SYNC pin function differ from SHDN on other LT1374 variants?
On the LT1374IS8-5SYNC#PBF, the SYNC pin replaces the SHDN pin found on non-SYNC versions. It accepts logic-level signals (1.5V–2.2V threshold) to synchronize the internal oscillator from 580kHz to 1MHz. Unlike SHDN, it does not provide shutdown control - that function is disabled. To shut down the LT1374IS8-5SYNC#PBF, drive the SYNC pin below 0.37V, which triggers micropower shutdown with 20µA supply current.
What is the purpose of the SENSE pin on LT1374IS8-5SYNC#PBF?
The SENSE pin on LT1374IS8-5SYNC#PBF is the feedback input for the fixed 5V output configuration. It is internally connected to the 5V output and compares against a precise 5.0V reference (4.94V–5.06V). This eliminates external resistors and provides ±1% output accuracy. Below 1V, the SENSE pin initiates foldback protection - reducing switching frequency and current limit to manage power dissipation during short-circuit events.
Is LT1374IS8-5SYNC#PBF RoHS compliant and lead-free?
Yes. The LT1374IS8-5SYNC#PBF carries the #PBF suffix, indicating it is lead-free and RoHS compliant per EU Directive 2011/65/EU. The SO-8 package uses matte tin lead finish, and all die attach, bond wires, and mold compound meet JEDEC J-STD-609 Category 2a requirements. Full compliance documentation is available through Analog Devices' quality portal.
LT1374IS8-5SYNC#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1374IS8-5SYNC#PBF FAQ
1.How can I place an order for LT1374IS8-5SYNC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374IS8-5SYNC#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 LT1374IS8-5SYNC#PBF reliable?
The price and inventory of LT1374IS8-5SYNC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374IS8-5SYNC#PBF is usually 5 days.
3.What payment methods are accepted for LT1374IS8-5SYNC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374IS8-5SYNC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374IS8-5SYNC#PBF?
LT1374IS8-5SYNC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374IS8-5SYNC#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 LT1374IS8-5SYNC#PBF?
For technical support, including LT1374IS8-5SYNC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374IS8-5SYNC#PBF requirements.
6.How does Aetrix verify that LT1374IS8-5SYNC#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374IS8-5SYNC#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 LT1374IS8-5SYNC#PBF meets industry standards.
7.What is the process for return or replacement of LT1374IS8-5SYNC#PBF?
All LT1374IS8-5SYNC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374IS8-5SYNC#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 LT1374IS8-5SYNC#PBF part is unused and in its original packaging.
Return procedure for LT1374IS8-5SYNC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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