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Analog Devices Inc. LT1374CR-5#TRPBF
- Part No.:
- LT1374CR-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374CR-5#TRPBF.pdf
- Description:
- IC REG BCK SEPIC 5V 4.5A DDPAK-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,209
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Product details
Overview
LT1374CR-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A monolithic 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 20µA shutdown current. Designed for high-efficiency DC/DC conversion in space-constrained battery-powered systems.
For engineers reviewing the LT1374CR-5#TRPBF datasheet, LT1374CR-5#TRPBF pinout, LT1374CR-5#TRPBF application, or LT1374CR-5#TRPBF equivalent, key selection considerations include its fixed 5V output, 6V–25V input range, thermal shutdown protection, exposed-pad thermal performance, and compatibility with standard surface-mount inductors down to 1.8µH.
Technical Context
The LT1374CR-5#TRPBF implements current-mode control with an internal 2.42V reference and integrated 4.5A NPN power switch. Its BOOST pin enables saturation drive, reducing conduction loss and enabling >89% efficiency at full load. The SENSE pin (replacing FB in -5 variants) monitors regulated 5V output directly for tight line/load regulation.
It integrates oscillator, error amplifier, slope compensation, and dual shutdown comparators (2.38V UVLO and 0.4V deep shutdown). Synchronization capability (via SYNC pin) allows external clocking up to 1MHz, while BIAS pin support improves efficiency at high VIN/low IOUT by sourcing bias current from VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (4.94–5.06V), referenced to internal SENSE threshold |
| Max Output Current | 4.5A at ≤50% duty cycle; derates to ~4.3A at 62.5% (VIN=8V, VOUT=5V) |
| Input Voltage Range | 6V to 25V - minimum start-up voltage is 5.5V; supports wide industrial/battery inputs |
| Switching Frequency | 500kHz ±8% - enables compact 1.8–10µH inductors and low-ESR ceramic output caps |
| Switch On-Resistance | 0.07Ω typical - reduces conduction loss; enables high efficiency even at 4.5A load |
| Shutdown Current | 20µA max - ensures ultra-low quiescent drain during system sleep modes |
| Thermal Protection | Internal thermal shutdown - prevents damage during sustained overload or poor PCB heatsinking |
Pinout & Package
LT1374CR-5#TRPBF 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 6 is SENSE (5V feedback); Pin 13 is SHDN (0.4V shutdown threshold); Pin 14 is VC (error amp output); Pin 15 is BIAS (for efficiency optimization).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Multi-pin connection lowers impedance; exposed pad must be soldered to PCB ground plane for θJA = 40°C/W |
| VIN (Pins 3, 4) | Input supply and switch collector | Must be shorted on PCB; high dI/dt node - requires local 100µF solid tantalum + 0.27µF ceramic bypass |
| SENSE (Pin 6) | 5V output voltage sensing input | Replaces FB in -5 variant; connects directly to 5V output; enables ±1.2% regulation without external divider |
| VSW (Pins 10, 11) | Switch emitter node | Must be shorted on PCB; drives external catch diode (e.g., MBRS330T3); clamped to –0.8V max |
| SHDN (Pin 13) | Logic-level shutdown control | 0.4V threshold for full shutdown; 2.38V for UVLO lockout; pulls supply current to 20µA when low |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Used for loop compensation (capacitor to GND); also accepts external clamp for override or current limiting |
| BIAS (Pin 15) | Efficiency-boosting bias supply input | When tied to 5V output, shifts internal bias current from VIN to VOUT - improves efficiency by >10% at VIN=20V |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with SENSE pin | Eliminates external resistor divider - simplifies layout, improves accuracy, and removes FB pin bias current error |
| BOOST-driven saturated NPN switch | 0.07Ω RON enables >89% peak efficiency - outperforms conventional bipolar designs by ~14% |
| Current-mode control with slope compensation | Ensures stable operation across full duty cycle range (up to 93%) - prevents subharmonic oscillation |
| Integrated cycle-by-cycle current limiting | Protects against short-circuit faults without external sensing - limits peak switch current to 4.5A (typ) |
| Thermal shutdown + UVLO | Dual-protection architecture - shuts down at TJ >125°C and disables startup below VIN = 5.5V |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core logic and I/O rail generation in ultraportable notebooks with 2-cell Li-ion input (6–8.4V). IC Role / Device Role / Timing Role: Primary 5V buck converter delivering up to 4.25A to SoC subsystems and USB peripherals. Use Value: High 500kHz switching enables use of 5µH inductor (vs. 10–22µH in 100–300kHz converters), reducing solution size by >35%. |
Use Scenario: Power management in handheld test equipment powered by 3-cell Li-ion (9–12.6V). IC Role / Device Role / Timing Role: Main 5V system rail regulator with shutdown control synchronized to host MCU sleep states. Use Value: 20µA shutdown current extends battery life in standby; thermal shutdown prevents field failures during enclosure overheating. |
| Battery Chargers | Distributed Power |
Use Scenario: 5V auxiliary supply in multi-bay Li-ion charger base station with shared 12V input bus. IC Role / Device Role / Timing Role: Isolated 5V rail for microcontroller, display, and communication interface (UART/I²C). Use Value: BIAS pin connection to 5V output improves efficiency by >10% at 12V input - reduces heat dissipation in enclosed chassis. |
Use Scenario: Point-of-load regulation in industrial PLC backplane with 24V nominal input (18–32V range). IC Role / Device Role / Timing Role: Local 5V supply for FPGA configuration, ADC reference, and digital I/O buffers. Use Value: 25V absolute max input rating and robust 4.5A current limit ensure reliable operation under 24V bus transients and hot-swap events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | Fixed 5V, 5A, 63kHz switching - larger magnetics required; no BIAS pin or SYNC capability | Limited to lower-frequency designs where EMI filtering is easier; lacks thermal foldback and precise UVLO | Choose for cost-sensitive, non-space-constrained applications where 500kHz operation is unnecessary |
| TPS54560QDGQRQ1 | Adjustable 3.5–60V input, 5A, 100–2500kHz sync-capable - requires external feedback resistors; higher quiescent current (146µA) | Supports wider input range and programmable frequency; lacks integrated SENSE function for fixed 5V | Prefer when input voltage exceeds 25V or when adjustable output is needed; not drop-in for LT1374CR-5#TRPBF footprint |
Compared with LM2678-5.0/NOPB and TPS54560QDGQRQ1, the LT1374CR-5#TRPBF delivers superior power density via 500kHz operation, tighter 5V regulation without external dividers, and lower shutdown current - making it optimal for portable and thermally constrained designs where fixed 5V is required.
Availability
LT1374CR-5#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 consistent parametric performance across temperature.
Supply support for LT1374CR-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 product support, documentation, and manufacturing continuity for the LT® portfolio.
The LT1374 family was designed as high-current, high-frequency monolithic buck regulators targeting space- and efficiency-critical DC/DC applications in portable, automotive, and industrial systems - with emphasis on thermal robustness and ease of layout.
FAQ
What is the maximum input voltage rating for the LT1374CR-5#TRPBF?
The LT1374CR-5#TRPBF has an absolute maximum input voltage rating of 25V. Operation above this level risks permanent damage. The recommended operating range is 6V to 25V, with guaranteed startup at ≥5.5V. For designs requiring >25V input, the LT1374HVCR-5 variant (32V max) is specified and validated.
Does the LT1374CR-5#TRPBF require an external feedback resistor divider?
No. The LT1374CR-5#TRPBF uses an internal resistor divider and the SENSE pin (Pin 6) connects directly to the 5V output. This eliminates external FB resistors, removes bias current-induced regulation error, and improves output accuracy to ±1.2% over temperature and line.
How does the BOOST pin function in the LT1374CR-5#TRPBF?
The BOOST pin supplies a voltage higher than VIN to the internal NPN switch base, enabling saturation and reducing effective on-resistance to 0.07Ω. It requires an external boost capacitor (e.g., 10nF) and Schottky diode (e.g., CMDSH3) from VIN to BOOST. Without proper BOOST circuitry, efficiency drops significantly due to increased VCE(sat).
Can the LT1374CR-5#TRPBF be synchronized to an external clock?
Yes. The LT1374CR-5#TRPBF includes a dedicated SYNC pin (Pin 12) that accepts logic-level signals (10–90% duty cycle) from 580kHz to 1MHz. When used, it overrides the internal 500kHz oscillator - enabling EMI reduction through frequency dithering or synchronization with system clocks.
What thermal design guidance applies to the LT1374CR-5#TRPBF in TSSOP package?
The LT1374CR-5#TRPBF's FE16 package requires the exposed thermal pad to be soldered to a minimum 0.5-inch² copper area connected to internal/external ground planes. With proper layout, θJA is 40°C/W. Failure to connect the pad increases junction temperature by >40°C at full load - risking thermal shutdown or reduced reliability.
LT1374CR-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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DDPAK-7
LT1374CR-5#TRPBF FAQ
1.How can I place an order for LT1374CR-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CR-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 LT1374CR-5#TRPBF reliable?
The price and inventory of LT1374CR-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 LT1374CR-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374CR-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CR-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CR-5#TRPBF?
LT1374CR-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CR-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 LT1374CR-5#TRPBF?
For technical support, including LT1374CR-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CR-5#TRPBF requirements.
6.How does Aetrix verify that LT1374CR-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374CR-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 LT1374CR-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374CR-5#TRPBF?
All LT1374CR-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CR-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 LT1374CR-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1374CR-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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