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Analog Devices Inc. LT1374CT7#PBF
- Part No.:
- LT1374CT7#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LT1374CT7#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:1,045
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Product details
Overview
LT1374CT7#PBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with an integrated 4.5A NPN power switch, fixed 5V output, and TO-220-7 package. It delivers up to 4.25A at 5V from 6V–25V input, features cycle-by-cycle current limiting, 0.07Ω switch on-resistance, and 20µA shutdown current. Used in battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1374CT7#PBF datasheet, LT1374CT7#PBF pinout, LT1374CT7#PBF application, or LT1374CT7#PBF equivalent, key selection criteria include its fixed 5V output configuration, thermal performance in TO-220-7 with exposed tab, 500kHz constant-frequency current-mode control, and compatibility with standard surface-mount magnetics and capacitors.
Technical Context
The LT1374CT7#PBF implements a current-mode buck topology with internal 2.42V reference, error amplifier transconductance of 2000 µMho, and slope-compensated peak-current sensing. Its BOOST pin enables saturation of the on-die NPN switch, reducing conduction loss and enabling >89% efficiency at full load.
It integrates oscillator, PWM logic, cycle-by-cycle current limit, undervoltage lockout (2.38V), and micropower shutdown (0.4V threshold). The fixed-output variant replaces FB with SENSE pin tied directly to VOUT, eliminating external feedback resistors and simplifying layout for 5V applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2%, internally trimmed - eliminates need for external feedback divider and improves accuracy over temperature. |
| Switch Current Limit | 4.5A typical at ≤50% duty cycle - sets maximum deliverable load current before foldback; derates nonlinearly above 50% DC. |
| Switching Frequency | 500kHz ±8% - enables use of small inductors (e.g., 5µH) and low-ESR ceramic output capacitors. |
| Supply Current (Active) | 2.5mA typical - low quiescent draw supports battery longevity in portable systems. |
| Shutdown Current | 20µA max at VIN ≤25V - ensures minimal drain during system sleep or standby modes. |
| Switch On Resistance | 0.07Ω typical at ISW = 4.5A - reduces conduction loss and thermal stress under high-load conditions. |
| Input Voltage Range | 6V to 25V - supports wide-range industrial and automotive battery inputs without external pre-regulation. |
Pinout & Package
LT1374CT7#PBF is housed in a 7-lead TO-220 package with exposed metal tab electrically connected to GND for thermal and EMI management. The tab must be soldered to a large copper area for θJA = 50°C/W operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB/SENSE | Output voltage sense input | Connected directly to 5V output; provides regulation feedback and short-circuit foldback triggering below 1V. |
| BOOST | Switch driver boost supply | Accepts capacitor-diode charge pump to raise drive voltage above VIN, enabling NPN saturation and low RCE(sat). |
| VIN | Main power input | Collector of internal NPN switch; powers internal bias circuitry; requires local 100µF solid tantalum bypass. |
| GND | Power and signal reference | Common return for output, bias, and switch; must be shorted to load ground to maintain load regulation. |
| VSW | Switch emitter node | Drives external catch diode and inductor; swings negative during off-time; clamped to –0.8V max. |
| SHDN | Shutdown control | Logic-compatible input: ≥2.38V enables UVLO; ≤0.4V forces micropower shutdown (20µA). |
| VC | Error amplifier output | Provides current command to switch comparator; used for compensation, current clamp, or loop override. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz frequency | Enables predictable EMI filtering and consistent inductor sizing across designs; immune to input/output variation. |
| Saturating switch design | 0.07Ω on-resistance achieved via BOOST-driven NPN - delivers higher efficiency than non-saturating bipolar or MOSFET alternatives at 4.5A. |
| Integrated cycle-by-cycle current limit | Hardware-based protection triggers per-switch cycle - prevents inductor saturation and thermal runaway during overload or short-circuit. |
| Feedback pin foldback | Reduces switching frequency and current limit when SENSE voltage drops below 1V - limits power dissipation in IC and external components during fault conditions. |
| Thermal shutdown | Activates at TJ = 125°C with hysteresis - protects device during sustained overload or inadequate heatsinking in TO-220 package. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Main 5V rail generation from 12V or multi-cell Li-ion battery in clamshell notebooks and tablets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 5V/4.25A to USB peripherals, display logic, and I/O controllers. Use Value: High efficiency (>89%) extends runtime; TO-220-7 package allows direct heatsink mounting; fixed 5V output reduces BOM count and layout complexity. |
Use Scenario: Power management in handheld test equipment, portable medical monitors, and ruggedized field instruments. IC Role / Device Role / Timing Role: Central DC/DC converter supplying 5V to microcontrollers, sensors, and communication interfaces from variable battery input (6–25V). Use Value: 20µA shutdown current preserves battery life during idle; current-mode control ensures fast transient response to sensor burst loads. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V supply in multi-chemistry battery chargers (Li-ion, NiMH, lead-acid) powering MCU, display, and charging control logic. IC Role / Device Role / Timing Role: Isolated auxiliary regulator providing clean 5V independent of main charging path; operates across wide input range as charger input varies. Use Value: Input range (6–25V) accommodates unregulated wall adapters and vehicle power; foldback protection prevents damage during battery insertion 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 buck converter replacing discrete switcher designs; accepts intermediate bus voltages (12V/24V) and delivers regulated 5V locally. Use Value: TO-220-7 package simplifies mechanical integration into dense PCB layouts; no external feedback components reduce footprint and calibration effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#PBF | 4A synchronous buck, 3MHz switching, QFN-16; requires external compensation; no BOOST pin. | Higher frequency enables smaller inductors but increases EMI sensitivity; lacks foldback protection and UVLO precision. | Choose for space-constrained designs needing >3MHz operation; avoid where fault robustness or wide-input simplicity is critical. |
| LM2678T-5.0/NOPB | 5A nonsynchronous buck, 63kHz, TO-220-5; no current-mode control; higher quiescent current (5mA). | Lower frequency demands larger magnetics; slower transient response; no SENSE-based foldback. | Choose for cost-sensitive, low-EMI applications with relaxed size and efficiency requirements; not suitable for battery runtime optimization. |
Compared with LT1374CT7#PBF, LTC3605EDE#PBF offers higher integration and frequency but sacrifices fault protection and ease of use; LM2678T-5.0/NOPB provides lower cost and simpler layout but trades off efficiency, thermal performance, and transient behavior.
Availability
LT1374CT7#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-lifecycle support, and proven thermal reliability in TO-220 packaging.
Supply support for LT1374CT7#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 product support, documentation, and manufacturing continuity for the LT® series. Linear pioneered high-performance analog power ICs with emphasis on efficiency, integration, and ruggedness.
The LT1374 belongs to Linear's monolithic buck regulator family designed for high-current, wide-input industrial and portable applications where thermal management, fault protection, and layout simplicity are critical.
FAQ
What is the maximum output current of the LT1374CT7#PBF at 5V output?
The LT1374CT7#PBF delivers up to 4.25A at 5V output when VIN = 10V and L = 5µH, as specified in the Typical Application Circuit (TA01). Maximum current decreases with higher input voltage due to increased inductor ripple and duty-cycle-dependent switch current derating - e.g., ~3.7A at VIN = 15V. Peak switch current is limited to 4.5A at ≤50% duty cycle and folds back under short-circuit conditions.
Does the LT1374CT7#PBF require an external BOOST capacitor and diode?
Yes, the LT1374CT7#PBF requires an external BOOST capacitor (typically 10nF–100nF) and Schottky diode (e.g., CMDSH3) connected between VIN and BOOST pins. This charge-pump network generates a voltage ~5V above VIN to saturate the internal NPN switch, achieving the specified 0.07Ω on-resistance and >89% efficiency. Omitting it results in excessive conduction loss and thermal failure.
How does the SENSE pin function differ from the FB pin in the LT1374CT7#PBF?
The LT1374CT7#PBF uses a SENSE pin instead of FB because it is the fixed 5V output variant. SENSE connects directly to the regulated 5V output to close the feedback loop - no external resistor divider is needed. It also enables foldback protection: when SENSE voltage drops below 1V, switching frequency and current limit reduce to limit fault power dissipation, a feature not available in adjustable versions using FB.
Can the LT1374CT7#PBF be synchronized to an external clock?
No, the LT1374CT7#PBF does not support synchronization. The TO-220-7 (T7) package lacks a SYNC pin; synchronization is only available on SO-8 (-SYNC) and TSSOP (-SYNC) variants. The SHDN pin on LT1374CT7#PBF is dedicated to shutdown control and cannot be repurposed for sync. For synchronized operation, consider LT1374CS8-SYNC or LT1374CFE-SYNC.
What thermal considerations apply to the LT1374CT7#PBF in TO-220-7 package?
The LT1374CT7#PBF TO-220-7 package has θJA = 50°C/W when mounted on a 1-in² copper pad. The exposed tab is internally connected to GND and must be soldered to this pad for effective heat transfer. Without proper heatsinking, junction temperature can exceed 125°C at full load and elevated ambient. Thermal shutdown activates at TJ = 125°C, but continuous operation near this limit degrades long-term reliability.
LT1374CT7#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LT1374CT7#PBF FAQ
1.How can I place an order for LT1374CT7#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CT7#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 LT1374CT7#PBF reliable?
The price and inventory of LT1374CT7#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CT7#PBF is usually 5 days.
3.What payment methods are accepted for LT1374CT7#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CT7#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CT7#PBF?
LT1374CT7#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CT7#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 LT1374CT7#PBF?
For technical support, including LT1374CT7#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CT7#PBF requirements.
6.How does Aetrix verify that LT1374CT7#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374CT7#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 LT1374CT7#PBF meets industry standards.
7.What is the process for return or replacement of LT1374CT7#PBF?
All LT1374CT7#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CT7#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 LT1374CT7#PBF part is unused and in its original packaging.
Return procedure for LT1374CT7#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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