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Analog Devices Inc. LT1374CR#TRPBF
- Part No.:
- LT1374CR#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374CR#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:887
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Product details
Overview
LT1374CR#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with integrated 4.5A NPN power switch, current-mode control architecture, and fixed 5V output. It operates from 6V to 25V input, delivers up to 4.25A continuous output, and features cycle-by-cycle current limiting, thermal shutdown, and 0.07Ω switch on-resistance. Used in portable computers and battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1374CR#TRPBF datasheet, LT1374CR#TRPBF pinout, LT1374CR#TRPBF application, or LT1374CR#TRPBF equivalent, key selection considerations include its fixed 5V output configuration (SENSE pin), 16-pin TSSOP-EP package with dual VIN/VSW pins, 500kHz constant-frequency operation, and compatibility with standard surface-mount inductors down to 1.8µH.
Technical Context
The LT1374CR#TRPBF implements a current-mode buck topology with internal 2.42V reference, error amplifier transconductance of 2000 µMho, and slope-compensated peak-current sensing. Its bipolar NPN switch is driven via BOOST pin to achieve saturation, reducing conduction loss and enabling >89% efficiency at 5V/4.25A.
It integrates oscillator, PWM logic, undervoltage lockout (2.38V), and dual-threshold shutdown (0.4V full shutdown, 2.38V UVLO). The SENSE pin monitors regulated 5V output directly, eliminating external feedback resistors and enabling precise ±1% output regulation (4.94–5.06V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1% (4.94V–5.06V); eliminates need for external feedback divider. |
| Switch Current Limit | 4.5A typical at ≤50% duty cycle; enables robust short-circuit protection without external sensing. |
| Switch On Resistance | 0.07Ω at 4.5A; reduces conduction loss and improves thermal performance in high-current applications. |
| Switching Frequency | 500kHz ±8% (460–540kHz); enables use of small inductors (e.g., 1.8µH) and low-ESR ceramic capacitors. |
| Input Voltage Range | 6V to 25V; supports wide industrial and battery-derived supplies including 12V nominal rails. |
| Shutdown Current | 20µA max at VIN ≤25V; ensures ultra-low quiescent power during system sleep modes. |
| Efficiency | 95% typical at 5V/2A, VIN=10V; achieved via BOOST-driven saturated switch and BIAS pin option for higher-VIN efficiency boost. |
Pinout & Package
LT1374CR#TRPBF is housed in a 16-pin exposed-pad TSSOP (FE16) package. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity. Dual VIN and VSW pins are internally connected and require external shorting on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Power and signal reference ground | Multiple GND pins reduce ground impedance and improve load regulation; exposed pad must be connected to ground plane. |
| VIN (Pins 3, 4) | Input supply collector node | Dual pins reduce trace inductance; must be shorted externally to minimize voltage spikes during switch turn-off. |
| BOOST (Pin 5) | Switch driver bootstrap supply | Requires external capacitor-diode network to generate ~VIN+5V drive; enables NPN saturation and low RCE(sat). |
| SENSE (Pin 6) | Fixed-output voltage sense input | Direct connection to 5V output; replaces FB pin in adjustable versions; enables ±1% regulation without external resistors. |
| VSW (Pins 10, 11) | Switch emitter node | Dual pins reduce emitter inductance; must be shorted externally; clamped to –0.8V max by external catch diode. |
| SYNC (Pin 12) | External oscillator synchronization input | Logic-level compatible (1.5–2.2V threshold); extends frequency range to 1MHz; replaces SHDN function in -SYNC variants. |
| SHDN (Pin 13) | Shutdown control input | 2.38V UVLO threshold (startup) and 0.4V full shutdown threshold; reduces supply current to 20µA when pulled low. |
| VC (Pin 14) | Error amplifier output / current limit setpoint | Used for loop compensation; also serves as current clamp point; voltage ranges from ~1V (light load) to ~2V (full load). |
| BIAS (Pin 15) | Internal bias supply input | Connect to regulated output (≥3.3V) to improve efficiency at high VIN/light load; not present in DD/SO-8 packages. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control architecture | Enables fast transient response and inherent loop stability without external compensation components beyond VC network. |
| Integrated BOOST drive circuitry | Allows NPN switch saturation, achieving 0.07Ω effective on-resistance and >89% efficiency-unusual for bipolar buck regulators. |
| Frequency foldback under fault | Reduces switching frequency 5:1 when SENSE voltage drops below 1V, limiting power dissipation during short-circuit conditions. |
| Programmable current limit foldback | Reduces peak switch current from 4.5A to <3A when SENSE falls below 1.7V, protecting IC, diode, and inductor during overload. |
| Thermal shutdown + cycle-by-cycle current limiting | Provides dual-layer protection against sustained overloads and ambient temperature excursions up to 125°C junction. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
|
Use Scenario: Core voltage regulation for embedded controllers and peripherals in clamshell notebooks and tablets. IC Role / Device Role / Timing Role: Fixed 5V buck converter supplying I/O rails and USB interface circuitry. Use Value: High efficiency (>90% at 2A) extends battery runtime; 500kHz operation minimizes solution size with 1.8µH inductor. |
Use Scenario: Power management in handheld test equipment, portable medical monitors, and wireless sensors. IC Role / Device Role / Timing Role: Primary DC/DC step-down stage converting Li-ion (8.4–12.6V) to stable 5V system rail. Use Value: 20µA shutdown current preserves battery life during standby; thermal shutdown prevents field failures in sealed enclosures. |
| Battery Chargers | Distributed Power |
|
Use Scenario: Auxiliary 5V supply for charger controller ICs, display backlight drivers, and communication interfaces. IC Role / Device Role / Timing Role: Secondary regulated output derived from main charging bus (e.g., 12–24V DC input). Use Value: Fixed 5V SENSE pin eliminates resistor tolerance errors; cycle-by-cycle current limiting protects against cell mismatch faults. |
Use Scenario: Local point-of-load regulation in telecom line cards, industrial PLC modules, and distributed sensor nodes. IC Role / Device Role / Timing Role: Compact, self-contained 5V/4.25A regulator replacing discrete buck solutions with external MOSFETs. Use Value: 16-pin TSSOP-EP package with exposed pad meets IPC-7351B thermal requirements; supports automated optical inspection (AOI). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850EMSE#TRPBF | 4-phase synchronous buck controller (external FETs); 500kHz–750kHz programmable frequency; no integrated switch. | Higher power (≥20A), multi-phase designs requiring dynamic phase shedding and PMBus telemetry. | Select LTC3850EMSE#TRPBF only when scalable high-current output or digital power management is required; not drop-in compatible. |
| MP2307DN-LF-Z | Monolithic 5V fixed-output buck; 2A max output; 34V max input; 0.12Ω MOSFET RDS(on); no BOOST or BIAS pins. | Cost-sensitive, lower-current (<2A) applications where thermal margin and efficiency above 90% are secondary. | MP2307DN-LF-Z offers smaller footprint and lower BOM cost but lacks LT1374CR#TRPBF's 4.5A capability, BOOST-enhanced efficiency, and fault-foldback protection. |
Compared with LTC3850EMSE#TRPBF and MP2307DN-LF-Z, the LT1374CR#TRPBF uniquely combines 4.5A integrated switching, BOOST-driven saturation, and analog fault-foldback-making it optimal for space-constrained 5V/3–4A systems demanding reliability over raw scalability or lowest cost.
Availability
LT1374CR#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1374CR#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1374 product line was designed specifically for high-efficiency, high-current monolithic buck conversion in space-constrained industrial and portable applications-emphasizing thermal robustness, fault resilience, and minimal external component count.
FAQ
What is the output voltage configuration of the LT1374CR#TRPBF?
The LT1374CR#TRPBF is a fixed 5V output variant. It uses the SENSE pin (not FB) connected directly to the regulated 5V output, providing ±1% accuracy (4.94V–5.06V) without external resistors. This differs from adjustable versions like LT1374CS8, which require an external feedback divider. The SENSE pin also enables built-in foldback protection during output faults.
Does the LT1374CR#TRPBF require an external BOOST capacitor and diode?
Yes, the LT1374CR#TRPBF requires an external BOOST capacitor and Schottky diode (e.g., MBRS330T3) connected between VIN and BOOST pins. This network generates a boosted gate drive voltage (~VIN + 5V) to saturate the internal NPN switch, achieving its specified 0.07Ω on-resistance and >89% efficiency. Omitting this network results in excessive conduction loss and thermal failure.
What is the maximum continuous output current for the LT1374CR#TRPBF?
The LT1374CR#TRPBF delivers up to 4.25A continuous output at 5V when used with appropriate thermal design (exposed pad soldered to ground plane) and input conditions (e.g., VIN = 10V, L = 5µH). Peak switch current is rated at 4.5A ≤50% duty cycle, derating to ~3.7A at 80% duty cycle due to internal slope compensation.
Can the LT1374CR#TRPBF be synchronized to an external clock?
Yes, the LT1374CR#TRPBF includes a SYNC pin (Pin 12) that accepts logic-level signals (10–90% duty cycle) to synchronize its internal 500kHz oscillator across a range of 580kHz to 1MHz. This feature reduces EMI by eliminating beat frequencies in multi-regulator systems. Note: the -SYNC variant replaces SHDN with SYNC; standard LT1374CR#TRPBF retains both functions.
What thermal management is required for reliable operation of the LT1374CR#TRPBF?
Reliable operation of the LT1374CR#TRPBF requires soldering the exposed thermal pad (Pin 16) to a minimum 0.5 square inch copper area connected to the PCB ground plane. With proper layout, θJA is 30°C/W, allowing operation up to 125°C junction temperature. Without thermal pad connection, θJA rises to >40°C/W, risking thermal shutdown under full load.
LT1374CR#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 21.5V
- 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#TRPBF FAQ
1.How can I place an order for LT1374CR#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CR#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#TRPBF reliable?
The price and inventory of LT1374CR#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374CR#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CR#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CR#TRPBF?
LT1374CR#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CR#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#TRPBF?
For technical support, including LT1374CR#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CR#TRPBF requirements.
6.How does Aetrix verify that LT1374CR#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374CR#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374CR#TRPBF?
All LT1374CR#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CR#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#TRPBF part is unused and in its original packaging.
Return procedure for LT1374CR#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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