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Analog Devices Inc. LT1374IR-5SYNC#PBF
- Part No.:
- LT1374IR-5SYNC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374IR-5SYNC#PBF.pdf
- Description:
- IC REG BCK SEPIC 5V 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,351
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Product details
Overview
LT1374IR-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 LT1374IR-5SYNC#PBF datasheet, LT1374IR-5SYNC#PBF pinout, LT1374IR-5SYNC#PBF application, or LT1374IR-5SYNC#PBF equivalent, key selection considerations include its fixed 5V output configuration, SYNC/SHDN pin assignment, thermal performance in the FE16 package, and compatibility with low-ESR output capacitors and 1.8–5µH inductors under 6–25V input.
Technical Context
The LT1374IR-5SYNC#PBF implements current-mode control with an internal 2.42V reference and uses slope compensation to maintain stability across duty cycles up to 93%. Its bipolar NPN power switch is driven via a BOOST pin to achieve saturation, reducing conduction loss and enabling >89% efficiency at full load with VIN = 10V and VOUT = 5V.
It integrates dual shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for micropower shutdown, drawing only 20µA in shutdown. The SENSE pin (replacing FB in -5 variants) monitors the regulated 5V output directly, while the SYNC pin accepts logic-level signals (10–90% duty cycle) to synchronize the oscillator from 580kHz to 1MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2%, guaranteed over line/load/temperature - eliminates external feedback divider and simplifies layout. |
| Max Output Current | 4.5A at ≤50% duty cycle; derates to 3.7A at 80% duty cycle - defines maximum continuous load under worst-case VIN/VOUT ratios. |
| Switch On Resistance | 0.07Ω typical at ISW = 4.5A - enables low conduction loss and high efficiency without external MOSFETs. |
| Switching Frequency | 500kHz nominal, ±8% over temperature - allows compact 1.8–5µH inductors and reduces EMI fundamental frequency. |
| Sync Range | 580kHz to 1MHz - permits noise-sensitive system-level clock alignment and avoids beat frequencies. |
| Shutdown Current | 20µA max at VIN ≤ 25V - ensures ultra-low quiescent power during system sleep modes. |
| Input Voltage Range | 6V to 25V - supports 12V rail, automotive battery transients, and wide-input industrial supplies. |
Pinout & Package
LT1374IR-5SYNC#PBF is housed in a 16-pin TSSOP (FE16) package with exposed thermal pad. Pin assignments are validated per Linear Technology's official FE16 mechanical drawing and functional pinout table. Both VIN pins (pins 3 & 4) and both VSW pins (pins 10 & 11) must be shorted externally on PCB for proper current sharing and thermal performance.
| 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 reduce EMI from high di/dt VSW switching currents. |
| VIN (pins 3, 4) | Main input supply connection | Dual VIN pins support high-current input routing and reduce trace resistance; must be shorted externally. |
| BOOST (pin 5) | Switch driver voltage boost node | Connects to external capacitor-diode network to saturate NPN switch; requires ≥2.3V above VIN for full 4.5A capability. |
| FB/SENSE (pin 6) | Fixed 5V output sensing input | Direct connection to 5V output; replaces FB pin in adjustable versions - enables precise regulation without external resistors. |
| VSW (pins 10, 11) | Switch emitter node | Dual VSW pins carry full inductor current; must be shorted externally and routed with minimal loop area to limit EMI. |
| SYNC (pin 12) | External oscillator synchronization input | Replaces SHDN function in -SYNC variants; accepts 1.5–2.2V logic-high to enable sync mode; 40kΩ input resistance. |
| SHDN (pin 13) | Shutdown control input | Active-low; 0.4V threshold forces micropower shutdown; 2.38V threshold enables UVLO - dual-threshold operation confirmed. |
| VC (pin 14) | Error amplifier output / current limit setpoint | Provides access to internal error amp output; used for compensation, current clamping, or loop override. |
| BIAS (pin 15) | Internal bias supply input | Accepts external 3–7V supply (e.g., regulated output) to improve efficiency at high VIN/light loads - available only in SO-8 and FE16 packages. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control with slope compensation | Enables stable operation up to 93% duty cycle and fast transient response without external compensation components. |
| Integrated BOOST drive circuitry | Reduces switch voltage drop to ~0.3V at 4.5A, improving efficiency by >14% versus conventional bipolar buck regulators. |
| Two-threshold shutdown (UVLO + deep shutdown) | Ensures reliable startup above 6V input and reduces standby current to 20µA - critical for battery longevity. |
| Frequency foldback below 1V SENSE | Automatically reduces switching frequency 5:1 during short-circuit events, limiting power dissipation in IC and external components. |
| Exposed-pad TSSOP thermal design | θJA = 30°C/W with 0.5 in² copper pour - supports 4.5A continuous operation without heatsink in compact layouts. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Main 5V rail generation from single-cell Li-ion (8.4V max) or dual-cell configurations. IC Role / Device Role / Timing Role: Primary step-down DC/DC converter delivering regulated 5V at up to 4.5A to USB peripherals, SSD controllers, and I/O interfaces. Use Value: High efficiency (>89% at 2A) extends runtime; 500kHz operation enables use of 2.2µH shielded inductors under 3mm height. |
Use Scenario: Power management in handheld test equipment with variable input (9–24V) and strict standby current limits. IC Role / Device Role / Timing Role: Fixed-output buck regulator with micropower shutdown, supporting wake-on-event functionality. Use Value: 20µA shutdown current preserves battery life over months; SYNC pin allows coordinated power sequencing with MCU clocks. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V supply for charger controller ICs and status LEDs in multi-bay Li-ion charging stations. IC Role / Device Role / Timing Role: Secondary power rail generator isolated from main charging path, operating from intermediate bus (12–20V). Use Value: Cycle-by-cycle current limiting prevents fault propagation during cell mismatch; thermal shutdown protects against enclosure overheating. |
Use Scenario: Local 5V conversion at point-of-load in industrial PLC backplanes with 24V distribution bus. IC Role / Device Role / Timing Role: Compact, high-current POL regulator mounted directly on I/O module PCBs. Use Value: Dual VIN/VSW pins and exposed pad enable robust 4.5A delivery in space-constrained modules; SYNC input aligns switching noise with system clock domain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EMSE-5#PBF | Fixed 5V output, 5A peak, 850kHz sync-capable, MOSFET drivers - requires external high-side/low-side FETs. | Higher current, higher frequency, but needs external power stage - larger BOM and layout complexity. | Select when >4.5A continuous load or tighter output ripple (<20mV) is required; not drop-in compatible. |
| TPS54560QDGQRQ1 | Adjustable 0.8–60V output, 5A, 100–2500kHz sync, integrated FETs - no BOOST pin, lower max VIN (60V). | Wider input range and adjustable output, but lacks dedicated 5V fixed variant and BOOST-assisted saturation. | Choose for designs needing flexibility across multiple output voltages or automotive AEC-Q100 qualification; different compensation and layout rules apply. |
Compared with LTC3850EMSE-5#PBF and TPS54560QDGQRQ1, the LT1374IR-5SYNC#PBF delivers optimized 5V fixed-output performance with minimal external components, superior light-load efficiency due to bipolar+BOOST architecture, and proven thermal behavior in FE16 - making it ideal for cost- and space-sensitive 5V POL applications where 4.5A suffices.
Availability
LT1374IR-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 RoHS-compliant packaging.
Supply support for LT1374IR-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 power ICs with proprietary bipolar and BiCMOS processes.
The LT1374IR-5SYNC#PBF belongs to Linear's monolithic current-mode buck regulator product line, engineered specifically for high-efficiency, high-current DC/DC conversion in space-constrained, thermally demanding applications where fixed 5V output and synchronization are critical.
FAQ
What is the exact output voltage tolerance of the LT1374IR-5SYNC#PBF?
The LT1374IR-5SYNC#PBF provides a fixed 5.0V output with a guaranteed tolerance of ±1.2% over line, load, and temperature (–40°C to 125°C junction). This is specified as 4.94V to 5.06V minimum/maximum under all conditions, with typical performance centered at 5.00V. The SENSE pin directly monitors the output, eliminating resistor-divider drift errors inherent in adjustable regulators.
Can the LT1374IR-5SYNC#PBF operate with input voltage below 6V?
No - the LT1374IR-5SYNC#PBF has a minimum input voltage of 6V, as confirmed by Absolute Maximum Ratings and Applications Information. Below this, internal bias regulation fails, causing loss of oscillator frequency stability and reference accuracy. Attempting operation at 5.5V may result in erratic startup or dropout under load; the device will not regulate reliably.
How does the BOOST pin function in the LT1374IR-5SYNC#PBF?
The BOOST pin in the LT1374IR-5SYNC#PBF supplies elevated drive voltage to the base of the internal NPN power switch, enabling saturation and minimizing VCE(sat). It requires an external bootstrap capacitor and Schottky diode (e.g., MBRS330T3) tied between VIN and BOOST. Minimum BOOST voltage must exceed VIN by 2.3V to sustain 4.5A output; insufficient BOOST causes increased conduction loss and thermal stress.
Is the LT1374IR-5SYNC#PBF pin-compatible with other LT1374 variants in the FE16 package?
Yes - the LT1374IR-5SYNC#PBF shares identical FE16 pinout and footprint with LT1374IFE, LT1374HVIFE, and other FE16 variants. However, pin functions differ: the -5 version replaces FB with SENSE (pin 6), and -SYNC replaces SHDN with SYNC (pin 12). PCB layout must match the specific variant's pin mapping; mixing -5 and adjustable or -SYNC and -SHDN variants requires netlist and silkscreen updates.
What thermal derating applies to the LT1374IR-5SYNC#PBF at 4.5A continuous load?
At 4.5A continuous output with VIN = 12V and VOUT = 5V, the LT1374IR-5SYNC#PBF dissipates ~1.8W. With the recommended 0.5 in² copper pour on the PCB's backside ground plane, θJA = 30°C/W yields ~54°C rise above ambient. Derating begins above 100°C junction temperature; full 4.5A is rated for TJ ≤ 125°C, requiring ≤71°C ambient with proper thermal design.
LT1374IR-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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1374IR-5SYNC#PBF FAQ
1.How can I place an order for LT1374IR-5SYNC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374IR-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 LT1374IR-5SYNC#PBF reliable?
The price and inventory of LT1374IR-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 LT1374IR-5SYNC#PBF is usually 5 days.
3.What payment methods are accepted for LT1374IR-5SYNC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374IR-5SYNC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374IR-5SYNC#PBF?
LT1374IR-5SYNC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374IR-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 LT1374IR-5SYNC#PBF?
For technical support, including LT1374IR-5SYNC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374IR-5SYNC#PBF requirements.
6.How does Aetrix verify that LT1374IR-5SYNC#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374IR-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 LT1374IR-5SYNC#PBF meets industry standards.
7.What is the process for return or replacement of LT1374IR-5SYNC#PBF?
All LT1374IR-5SYNC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374IR-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 LT1374IR-5SYNC#PBF part is unused and in its original packaging.
Return procedure for LT1374IR-5SYNC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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