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Analog Devices Inc. LT1374CR-5SYNC#PBF
- Part No.:
- LT1374CR-5SYNC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374CR-5SYNC#PBF.pdf
- Description:
- IC REG BCK SEPIC 5V 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,368
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Product details
Overview
LT1374CR-5SYNC#PBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 4.5A synchronous step-down switching regulator in a 16-pin TSSOP package with exposed pad. It operates at a constant 500kHz switching frequency, features cycle-by-cycle current limiting, 0.07Ω switch on-resistance, and supports external synchronization up to 1MHz. It is designed for high-efficiency power conversion in battery-powered systems requiring stable 5V rails.
For engineers reviewing the LT1374CR-5SYNC#PBF datasheet, LT1374CR-5SYNC#PBF pinout, LT1374CR-5SYNC#PBF application, or LT1374CR-5SYNC#PBF equivalent, key selection considerations include its fixed 5V output configuration, SYNC/SHDN pin replacement in this variant, thermal performance in the exposed-pad TSSOP, and compatibility with standard surface-mount magnetics and catch diodes.
Technical Context
The LT1374CR-5SYNC#PBF implements current-mode control with an internal 2.42V reference and uses slope compensation to ensure stability across duty cycles up to 93%. Its bipolar NPN power switch is driven via the BOOST pin to achieve saturation, enabling low conduction loss (0.07Ω typical) and >89% efficiency at full load.
It integrates oscillator, error amplifier (2000 µMho transconductance), peak-current comparator, and dual shutdown comparators (2.38V UVLO and 0.4V deep shutdown). The SENSE pin (replacing FB in -5 variants) monitors regulated 5V output directly, while the SYNC pin replaces SHDN to accept logic-level external clock signals from 580kHz to 1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.2% (guaranteed 4.90–5.10 V over temperature and line) |
| Max Output Current | 4.5 A at ≤50% duty cycle; derates to 3.7 A at 80% duty cycle due to slope compensation |
| Switching Frequency | 500 kHz nominal (460–540 kHz over temp); synchronizable from 580 kHz to 1 MHz |
| Switch On-Resistance | 0.07 Ω typical at 4.5 A - enables high efficiency without external MOSFETs |
| Input Voltage Range | 6 V to 25 V - supports wide-input industrial and portable battery systems |
| Shutdown Current | 20 µA max - enables ultra-low-power standby in battery-critical applications |
| Thermal Shutdown | Integrated protection triggers at 125°C junction temperature |
Pinout & Package
LT1374CR-5SYNC#PBF is housed in a 16-pin TSSOP package (FE16) with exposed thermal pad. Pin 1 is GND; Pins 3 & 4 are VIN (must be shorted externally); Pins 10 & 11 are VSW (must be shorted externally); Pin 14 is VC; Pin 15 is BIAS; Pin 12 is SYNC (replaces SHDN in this variant); Pin 6 is FB/SENSE (configured as SENSE for fixed 5V operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Four dedicated GND pins minimize ground impedance and improve EMI performance; exposed pad must be soldered to PCB ground plane |
| VIN (Pins 3, 4) | Main input supply connection | Dual VIN pins reduce trace inductance and voltage spikes during high dI/dt switching transitions |
| VSW (Pins 10, 11) | Switch emitter node | Dual VSW pins lower parasitic inductance; requires direct connection to catch diode cathode and inductor |
| SENSE (Pin 6) | Fixed-output voltage feedback | Direct connection to 5V output; replaces FB pin in adjustable versions; enables precise regulation without external divider |
| SYNC (Pin 12) | External oscillator synchronization input | Logic-compatible (1.5–2.2 V threshold); replaces SHDN function; allows noise-sensitive systems to align switching to master clock |
| VC (Pin 14) | Error amplifier output / current limit control | Used for loop compensation; also serves as current clamp point - driving it to ground disables switching |
| BIAS (Pin 15) | Efficiency-boosting auxiliary supply | Connect to regulated 5V output to source internal bias current, improving efficiency by >10% at high VIN/light loads |
Key Features
| Feature | Design Value |
|---|---|
| Constant-frequency current-mode control | Enables predictable EMI spectrum and fast transient response without subharmonic oscillation |
| BOOST-driven saturated NPN switch | Achieves FET-like 0.07Ω RON, eliminating need for external gate drivers or bootstrap circuits |
| Integrated foldback protection | Reduces switching frequency and current limit when output collapses below 1V - limits power dissipation during shorts |
| Exposed-pad TSSOP thermal design | θJA = 30°C/W with 0.5 in² copper area - supports 4.5A continuous operation without heatsink |
| Synchronization capability | Accepts external clock up to 1MHz - eliminates beat frequencies in multi-rail systems and reduces conducted EMI |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Main 5V rail generation from 12V or Li-ion battery pack (8–25V range) in ultrabooks and tablets. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V to USB peripherals, SSD controllers, and I/O interfaces. Use Value: High efficiency (>89%) extends battery runtime; SYNC pin enables alignment with system clock to suppress EMI in RF-sensitive zones. |
Use Scenario: Power management in handheld test equipment, portable medical monitors, and ruggedized field instruments. IC Role / Device Role / Timing Role: Fixed 5V supply for microcontrollers, ADCs, and display drivers operating from primary or backup batteries. Use Value: 20µA shutdown current preserves battery life during sleep; integrated thermal shutdown prevents field failures under ambient temperature extremes. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V rail in multi-chemistry battery chargers supporting Li-ion, NiMH, and lead-acid chemistries. IC Role / Device Role / Timing Role: Isolated or non-isolated 5V supply for charger controller ICs, communication interfaces (UART/I²C), and status LEDs. Use Value: Wide 6–25V input accommodates variable adapter inputs; foldback protection prevents thermal runaway during cell fault conditions. |
Use Scenario: Local point-of-load regulation in telecom line cards, industrial PLC modules, and distributed sensor nodes. IC Role / Device Role / Timing Role: Secondary 5V regulator fed from intermediate 12V or 24V backplane, powering FPGA I/O banks and interface transceivers. Use Value: Synchronization capability eliminates switching noise coupling into high-speed serial links (e.g., PCIe, USB 3.0); robust 4.5A rating supports burst-mode loads. |
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 3A rating, 3MHz switching, no SYNC pin, smaller 10-lead MSOP package | Lower current, higher frequency - suited for space-constrained, low-noise designs where 4.5A is unnecessary | Select when board area is critical and load current ≤3A; not suitable for high-current or synchronized systems. |
| TPS54560QDGQRQ1 | Automotive-grade 5V buck (4.5A), 100V max input, integrated soft-start, no SYNC, SOIC-8 package | Designed for harsh environments (–40°C to 150°C), lacks synchronization but adds automotive safety features | Select for automotive or extended-temp industrial use where sync is not required and 100V input tolerance is needed. |
Compared with LTC3631EMSE-5#PBF and TPS54560QDGQRQ1, the LT1374CR-5SYNC#PBF uniquely combines 4.5A capability, 500kHz fixed frequency, SYNC functionality, and exposed-pad thermal performance - making it optimal for high-reliability, medium-frequency, synchronized power systems where layout-controlled EMI and thermal headroom are critical.
Availability
LT1374CR-5SYNC#PBF 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 consistent parametric performance across production batches.
Supply support for LT1374CR-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 and power ICs with emphasis on precision, speed, and reliability.
The LT1374 series was designed specifically for high-current, high-efficiency DC/DC conversion in space- and thermally-constrained applications - targeting portable computing, industrial power, and battery infrastructure where fixed 5V rails demand robustness and low quiescent power.
FAQ
What is the function of the SENSE pin on the LT1374CR-5SYNC#PBF?
The SENSE pin on the LT1374CR-5SYNC#PBF replaces the FB pin found on adjustable versions and connects directly to the regulated 5V output. It provides precise feedback for the internal 2.42V reference, enabling accurate 5.0V ±1.2% regulation without external resistors. Unlike FB, SENSE does not support voltage adjustment and is optimized for fixed-output stability and fast transient response in the LT1374CR-5SYNC#PBF.
Can the LT1374CR-5SYNC#PBF operate without the BOOST capacitor?
No - the LT1374CR-5SYNC#PBF requires the external BOOST capacitor (typically 10nF–100nF) and associated Schottky diode (e.g., CMDSH3) to drive the internal NPN switch into saturation. Without BOOST, the switch operates in linear mode, increasing conduction loss dramatically (RON rises from 0.07Ω to ~1.5Ω), reducing efficiency below 75%, and risking thermal shutdown. The BOOST circuit is mandatory for specified 4.5A operation and 89%+ efficiency in the LT1374CR-5SYNC#PBF.
What is the maximum recommended inductor value for the LT1374CR-5SYNC#PBF at 5V/4.5A output?
The LT1374CR-5SYNC#PBF supports inductors from 3µH to 20µH depending on input voltage and ripple requirements. For 5V/4.5A operation with VIN = 12V, a 10µH inductor is recommended to maintain continuous conduction mode and limit peak switch current to ≤4.5A. Larger values (e.g., 20µH) reduce ripple and core loss but increase physical size and may limit maximum load current at low VIN due to duty-cycle constraints - verified in the "Maximum Load Current" graphs of the LT1374CR-5SYNC#PBF datasheet.
How does the SYNC pin affect the shutdown functionality in the LT1374CR-5SYNC#PBF?
In the LT1374CR-5SYNC#PBF, the SYNC pin replaces the SHDN pin present in non-SYNC variants - meaning this part does not support hardware shutdown. When SYNC is unused, it must be tied to GND or left open (with appropriate noise filtering) to prevent spurious triggering. To disable switching, the VC pin can be pulled to GND, or the BIAS pin can be disconnected to force operation from VIN only - but true micropower shutdown (20µA) is unavailable in the LT1374CR-5SYNC#PBF due to the SYNC-for-SHDN pin swap.
Is the LT1374CR-5SYNC#PBF RoHS-compliant and lead-free?
Yes - the LT1374CR-5SYNC#PBF is RoHS-compliant and lead-free, as indicated by the "#PBF" suffix in the part number. It meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), requires standard reflow profiles for lead-free soldering, and carries the full Analog Devices environmental compliance documentation including REACH and conflict minerals statements - all applicable to the LT1374CR-5SYNC#PBF production lot.
LT1374CR-5SYNC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- DDPAK-7
LT1374CR-5SYNC#PBF FAQ
1.How can I place an order for LT1374CR-5SYNC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CR-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 LT1374CR-5SYNC#PBF reliable?
The price and inventory of LT1374CR-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 LT1374CR-5SYNC#PBF is usually 5 days.
3.What payment methods are accepted for LT1374CR-5SYNC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CR-5SYNC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CR-5SYNC#PBF?
LT1374CR-5SYNC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CR-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 LT1374CR-5SYNC#PBF?
For technical support, including LT1374CR-5SYNC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CR-5SYNC#PBF requirements.
6.How does Aetrix verify that LT1374CR-5SYNC#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374CR-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 LT1374CR-5SYNC#PBF meets industry standards.
7.What is the process for return or replacement of LT1374CR-5SYNC#PBF?
All LT1374CR-5SYNC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CR-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 LT1374CR-5SYNC#PBF part is unused and in its original packaging.
Return procedure for LT1374CR-5SYNC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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