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Analog Devices Inc. LT1374IR-5#TRPBF
- Part No.:
- LT1374IR-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374IR-5#TRPBF.pdf
- Description:
- IC REG BCK SEPIC 5V 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,810
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Product details
Overview
LT1374IR-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A monolithic synchronous step-down switching regulator in 16-pin TSSOP with exposed pad. It operates at a constant 500kHz switching frequency, features cycle-by-cycle current limiting, 0.07Ω switch on-resistance, and supports input voltages from 6V to 25V. It is designed for high-efficiency power conversion in space-constrained battery-powered systems.
For engineers reviewing the LT1374IR-5#TRPBF datasheet, LT1374IR-5#TRPBF pinout, LT1374IR-5#TRPBF application, or LT1374IR-5#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain-ready availability details - all grounded in official Linear Technology documentation and Analog Devices product data.
Technical Context
The LT1374IR-5#TRPBF implements current-mode control with an internal 2.42V reference and fixed 5V output via integrated SENSE resistor network. Its bipolar NPN power switch is driven by a BOOST pin circuit enabling saturation and low conduction loss (0.07Ω typical). The 500kHz oscillator is temperature-stable and line-regulated (±0.15%/V), supporting fast transient response without external compensation.
It integrates undervoltage lockout (2.38V threshold), thermal shutdown, and dual-mode shutdown: micropower mode (20µA) at SHDN < 0.4V and UVLO standby at SHDN < 2.38V. The BIAS pin (available in TSSOP) allows efficiency optimization by sourcing bias current from the regulated output when VIN ≥ 20V and VOUT = 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (4.94–5.06V), eliminating external feedback resistors and reducing layout sensitivity. |
| Max Output Current | 4.5A continuous at ≤50% duty cycle; derates to ~4.3A at 62.5% duty cycle (VIN=8V, VOUT=5V), defining practical load limits. |
| Switch On-Resistance | 0.07Ω typical at 4.5A, enabling >89% peak efficiency and minimizing thermal stress vs. conventional bipolar regulators. |
| Switching Frequency | 500kHz ±8% (460–540kHz), enabling compact 1.8–5µH inductors and reducing EMI fundamental frequency. |
| Shutdown Current | 20µA typical at VSHDN = 0V, VIN ≤ 25V, enabling ultra-low-power sleep states in portable systems. |
| Input Voltage Range | 6V to 25V minimum operating range; absolute max 25V - requires input filtering above 6V to avoid startup failure. |
| Efficiency @ 5V/3A | ≥89% at VIN = 10V, confirming minimal power loss in mid-range loads typical of embedded computing rails. |
Pinout & Package
LT1374IR-5#TRPBF is housed in a 16-pin TSSOP package with exposed thermal pad (FE16), optimized for high-power density and thermal dissipation in surface-mount applications. The exposed pad must be soldered to a PCB ground plane for θJA = 30°C/W 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; critical for load regulation and EMI control - must connect directly to solid ground plane. |
| VIN (Pins 3, 4) | Main input voltage supply | Dual VIN pins reduce trace inductance and voltage spikes during switch transitions - must be shorted together on PCB. |
| VSW (Pins 10, 11) | Switch emitter node | Dual VSW pins carry high di/dt switching current - requires tight coupling to catch diode and inductor to limit negative swing (< –0.8V). |
| BOOST (Pin 5) | Switch driver boost supply | Connects to external capacitor-diode network to generate ~VIN+5V drive - enables NPN saturation and 0.07Ω RON. |
| FB/SENSE (Pin 6) | Fixed 5V output sense input | Internally connected to 5V output; monitors regulation accuracy and triggers foldback protection if voltage collapses below 4.4V. |
| SHDN (Pin 13) | Shutdown control input | Logic-compatible input: <0.4V forces full shutdown (20µA IQ); 2.38V threshold enables UVLO for controlled startup. |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Provides access to internal loop compensation node; can be clamped to override current limit or force shutdown. |
| BIAS (Pin 15) | Internal bias supply input | Accepts 3–7V external source (e.g., 5V output) to improve efficiency at high VIN - mandatory for >10% gain at VIN=20V. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables stable loop operation with minimal external compensation and <10µs load transient recovery time. |
| Integrated slope compensation | Prevents subharmonic oscillation up to 90% duty cycle without external components - critical for wide VIN ranges. |
| Frequency foldback protection | Reduces switching frequency 5:1 when output collapses (<1V FB), limiting power dissipation during short-circuit faults. |
| Thermal shutdown + cycle-by-cycle current limit | Guarantees safe operation under overload, ambient >125°C, or poor heatsinking - no external fault management required. |
| BOOST-driven saturated switch | Delivers FET-like conduction loss (0.07Ω) using bipolar process, achieving >89% efficiency where MOSFET-based ICs typically lag. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core logic rail (5V) in ultraportable laptops with 3-cell Li-ion input (8.4–12.6V). IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V at up to 4.25A with dynamic load steps. Use Value: 500kHz operation enables 3.3µH inductor footprint < 3mm²; 20µA shutdown extends battery life during suspend-to-RAM. |
Use Scenario: Power management in handheld test equipment powered by 4xAA alkaline (6–9V). IC Role / Device Role / Timing Role: Main system supply converting variable battery voltage to stable 5V for MCU, display, and sensors. Use Value: Wide 6–25V input range accommodates full battery discharge curve; foldback protection prevents thermal runaway during probe shorts. |
| Battery Chargers | Distributed Power |
Use Scenario: 5V auxiliary rail in multi-chemistry smart chargers (Li-ion/NiMH) with USB-C PD input negotiation. IC Role / Device Role / Timing Role: Secondary regulated supply powering charger controller, communication ICs, and status LEDs. Use Value: Fixed 5V output eliminates calibration drift; BIAS pin connection to 5V rail improves efficiency by >10% at 20V input. |
Use Scenario: Local 5V point-of-load regulator on industrial I/O modules fed from 24V backplane. IC Role / Device Role / Timing Role: High-current DC-DC stage providing noise-isolated 5V for analog front-ends and isolated comms. Use Value: Dual VIN/VSW pins and four GNDs suppress ground bounce in noisy 24V environments; thermal shutdown ensures reliability in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#PBF | 4A, 3MHz synchronous buck; uses MOSFET switches, lower IQ (25µA), no BOOST pin required. | Higher frequency enables smaller inductors but increases switching loss above 2A; lacks foldback protection. | Choose for ultra-compact designs where 3MHz operation is acceptable and short-circuit robustness is managed externally. |
| TPS54560QDGQRQ1 | 5A, 100kHz–2.5MHz adjustable-frequency buck; integrated high-side MOSFET, 3.5–60V input. | Wider input range and AEC-Q100 qualification suit automotive; lower switching frequency increases inductor size. | Choose for automotive-grade 5V rails requiring extended temp support (–40°C to 125°C) and higher VIN tolerance. |
Compared with LT1374IR-5#TRPBF, LTC3605EDE-5#PBF offers higher frequency and lower quiescent current but sacrifices short-circuit foldback and thermal robustness; TPS54560QDGQRQ1 provides automotive qualification and wider VIN but requires larger magnetics and lacks the BOOST-enabled saturation efficiency at high current.
Availability
LT1374IR-5#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, long-lifecycle assurance, and guaranteed traceability.
Supply support for LT1374IR-5#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 support for the LT® switching regulator portfolio, known for precision analog integration and rugged power management ICs.
The LT1374 family was engineered for high-efficiency, high-current DC-DC conversion in space-constrained industrial and portable applications - emphasizing thermal resilience, fault protection, and minimal external component count.
FAQ
What is the maximum input voltage rating for the LT1374IR-5#TRPBF?
The LT1374IR-5#TRPBF has an absolute maximum input voltage rating of 25V. Operation above this level risks permanent damage. Its specified functional input range is 6V to 25V; below 6V, the internal bias regulator cannot maintain regulation, causing startup failure or erratic behavior. Always include input overvoltage protection if system transients exceed 25V.
Does the LT1374IR-5#TRPBF require an external BOOST capacitor and diode?
Yes, the LT1374IR-5#TRPBF requires an external BOOST capacitor and Schottky diode (e.g., MBRS330T3) connected between VIN and BOOST pins. This network generates the ~VIN+5V gate drive needed to saturate the internal NPN switch and achieve its 0.07Ω on-resistance. Omitting it results in excessive conduction loss, thermal runaway, and failure to deliver rated 4.5A output.
Can the LT1374IR-5#TRPBF be synchronized to an external clock?
No, the LT1374IR-5#TRPBF does not support synchronization. The -5 variant replaces the SYNC pin with SHDN functionality. Only variants marked "-SYNC" (e.g., LT1374IR-SYNC) or "-5 SYNC" include the SYNC pin. Attempting to drive a clock signal into the SHDN pin of LT1374IR-5#TRPBF will trigger shutdown instead of synchronization.
What is the purpose of the BIAS pin on the LT1374IR-5#TRPBF?
The BIAS pin on the LT1374IR-5#TRPBF accepts an external 3–7V supply (typically the 5V output) to power internal circuitry, reducing total input current draw and improving efficiency - especially at high VIN (e.g., 20V input → 5V output). When unused, BIAS floats and internal bias is drawn from VIN, increasing quiescent loss. Connecting BIAS to VOUT yields >10% efficiency gain at light loads.
How does the LT1374IR-5#TRPBF protect against short-circuit conditions?
The LT1374IR-5#TRPBF employs three-tiered short-circuit protection: (1) cycle-by-cycle current limiting caps peak switch current at 4.5A; (2) frequency foldback reduces switching frequency 5:1 when output collapses (<1V at SENSE), lowering average power; and (3) thermal shutdown disables the IC if junction temperature exceeds 125°C. These operate simultaneously without external components.
LT1374IR-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1374IR-5#TRPBF FAQ
1.How can I place an order for LT1374IR-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374IR-5#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 LT1374IR-5#TRPBF reliable?
The price and inventory of LT1374IR-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374IR-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374IR-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374IR-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374IR-5#TRPBF?
LT1374IR-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374IR-5#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 LT1374IR-5#TRPBF?
For technical support, including LT1374IR-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374IR-5#TRPBF requirements.
6.How does Aetrix verify that LT1374IR-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374IR-5#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 LT1374IR-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374IR-5#TRPBF?
All LT1374IR-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374IR-5#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 LT1374IR-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1374IR-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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