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Analog Devices Inc. LT1374CR#PBF
- Part No.:
- LT1374CR#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LT1374CR#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A DDPAK
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LT1374CR#PBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with an 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 at 5V, and features cycle-by-cycle current limiting, thermal shutdown, and 20µA shutdown current. It is used in portable computers and battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1374CR#PBF datasheet, LT1374CR#PBF pinout, LT1374CR#PBF application, or LT1374CR#PBF equivalent, key selection considerations include its 500kHz constant-frequency operation, 0.07Ω switch on-resistance, 2.5mA quiescent supply current, 5V fixed output configuration, and compatibility with standard surface-mount inductors as small as 1.8µH.
Technical Context
The LT1374CR#PBF implements a current-mode buck topology with internal oscillator, error amplifier, slope compensation, and dual comparators for peak-current sensing and undervoltage lockout. Its bipolar NPN switch is driven via a BOOST pin to achieve saturation, reducing conduction loss and enabling >89% efficiency at full load.
It supports synchronization (via SYNC pin) to external clocks up to 1MHz and includes foldback protection: switching frequency drops below 1V FB/SENSE voltage, and current limit reduces below 1.7V. The SENSE pin (replacing FB in -5 variants) connects directly to the 5V output for regulation and fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (guaranteed over temperature and line) |
| Switch Current Limit | 4.5A typical (enables ≥4.25A continuous output with proper inductor sizing) |
| Switching Frequency | 500kHz ±8% (constant frequency enables predictable EMI filtering and small passive sizing) |
| Switch On Resistance | 0.07Ω typical (minimizes conduction loss; enables high efficiency even at 4.5A) |
| Shutdown Current | 20µA max (supports ultra-low-power standby in battery systems) |
| Input Voltage Range | 6V to 25V (supports wide-range industrial and automotive input rails) |
| Efficiency @ 5V/3A | ≥89% (measured at VIN = 10V, VOUT = 5V, L = 10µH, T = 25°C) |
Pinout & Package
LT1374CR#PBF is housed in a 16-pin exposed-pad TSSOP package (FE16), optimized for thermal dissipation and high-density layouts. The exposed pad must be soldered to a ground plane for θJA ≤ 30°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Power and signal reference | Must connect to low-impedance ground plane; serves as output voltage reference and EMI return path |
| VIN | Input power supply | Collector of internal NPN switch; powers internal circuitry; requires local 100µF solid tantalum bypass |
| BOOST | Switch driver boost supply | Connected to VIN + diode + capacitor; provides >VIN drive voltage to saturate NPN switch |
| SENSE | Output voltage feedback | Direct connection to 5V output; internal 2.42V reference compares against SENSE to regulate |
| VSW | Switch emitter node | Drives external catch diode and inductor; swings negative during off-time; clamped to –0.8V max |
| SYNC | External clock synchronization input | Logic-level compatible (1.5–2.2V threshold); extends operating frequency range to 1MHz |
| SHDN | Shutdown control | Two thresholds: 2.38V (UVLO lockout), 0.4V (full micropower shutdown); sinks current when active |
| VC | Error amplifier output / current limit setpoint | Used for loop compensation; also functions as current clamp or override point (0.9–2.1V range) |
| BIAS | Internal bias supply auxiliary input | Accepts external 3–7V (e.g., regulated output); improves efficiency at high VIN/light loads |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response and inherent stability without external compensation components |
| Saturating NPN switch with BOOST drive | Achieves 0.07Ω effective RCE(sat), reducing conduction loss vs. conventional bipolar designs |
| Foldback protection (frequency & current) | Reduces switching frequency and peak current under short-circuit or low-VOUT conditions to limit power dissipation |
| Integrated cycle-by-cycle current limiting | Prevents switch destruction during overload; no external sense resistor required |
| Thermal shutdown with hysteresis | Protects device at TJ ≥ 125°C; resumes operation after cooldown to ~110°C |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core logic and I/O rail generation in laptops and tablets using single-cell Li-ion or multi-cell battery inputs. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying CPU core logic, USB controllers, and display interfaces. Use Value: Delivers 4.25A at 5V with <20µA shutdown current, extending runtime; 500kHz operation allows use of 1.8µH inductors for minimal board area. |
Use Scenario: Power management in handheld test equipment, medical monitors, and portable instrumentation. IC Role / Device Role / Timing Role: Main system regulator converting 9–24V battery or adapter input to stable 5V for microcontrollers and sensors. Use Value: High efficiency (>89% at 3A) preserves battery life; thermal shutdown and foldback protect against accidental shorts during field use. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V supply in multi-output chargers for charging ICs, status LEDs, and communication interfaces. IC Role / Device Role / Timing Role: Secondary regulated output stage providing isolated 5V for charger control logic and USB enumeration. Use Value: Fixed 5V output eliminates external resistor divider; SYNC capability allows noise-sensitive timing alignment with primary charger controller. |
Use Scenario: Point-of-load (POL) conversion in telecom and industrial backplanes where 12V or 24V intermediate bus supplies 5V subsystems. IC Role / Device Role / Timing Role: Compact, high-current POL regulator replacing discrete buck solutions in space-constrained modules. Use Value: 16-pin TSSOP with exposed pad supports >4A thermal performance in 0.25″² footprint; all-surface-mount design simplifies automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1374CR-5#PBF | Identical electrical specs and pinout; same FE16 package; differs only in part marking convention (no functional difference) | No application difference - functionally identical replacement with alternate ordering suffix | Select LT1374CR-5#PBF if distributor inventory or BOM standardization favors the -5 suffix variant |
| LT3502AEDD#PBF | Higher 3MHz switching frequency, lower 2.5A switch rating, integrated soft-start, different pinout (10-pin DFN), no BOOST pin | Better suited for ultra-compact designs needing <1µH inductors; not drop-in due to pinout and control differences | Choose LT3502AEDD#PBF only when board redesign permits smaller magnetics and higher-frequency EMI filtering |
Compared with LT1374CR#PBF, LT1374CR-5#PBF offers identical performance and fit, while LT3502AEDD#PBF trades peak current and BOOST-driven efficiency for higher frequency and smaller passives - making it suitable only for new designs prioritizing size over raw current capability.
Availability
LT1374CR#PBF 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 guaranteed traceable sourcing.
Supply support for LT1374CR#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 processes.
The LT1374CR#PBF belongs to Linear's monolithic buck regulator product line, designed specifically for high-current, high-efficiency DC/DC conversion in space- and thermal-constrained environments where reliability and integration are critical.
FAQ
What is the maximum continuous output current of the LT1374CR#PBF?
The LT1374CR#PBF delivers up to 4.25A continuous output current at 5V when used with a properly sized inductor (e.g., 10µH) and input voltage of 10V. Peak switch current is rated at 4.5A up to 50% duty cycle, decreasing nonlinearly at higher duty cycles per internal slope compensation. Actual achievable load current depends on thermal design, inductor DCR, and ambient temperature.
Does the LT1374CR#PBF require an external BOOST capacitor and diode?
Yes, the LT1374CR#PBF requires an external BOOST capacitor and Schottky diode (e.g., MBRS330T3) connected between VIN and BOOST pins. This network generates a voltage higher than VIN to fully saturate the internal NPN power switch, achieving the specified 0.07Ω on-resistance and >89% efficiency. Omitting the BOOST network degrades efficiency and increases thermal stress.
Can the LT1374CR#PBF be synchronized to an external clock?
Yes, the LT1374CR#PBF includes a dedicated SYNC pin that accepts logic-level signals (10–90% duty cycle) to synchronize its internal 500kHz oscillator across a range of 580kHz to 1MHz. This feature enables noise reduction in multi-regulator systems and EMI compliance by aligning switching edges. The SYNC pin replaces SHDN functionality in -SYNC variants, but LT1374CR#PBF retains both pins.
What is the purpose of the SENSE pin on the LT1374CR#PBF?
The SENSE pin on the LT1374CR#PBF replaces the FB pin found on adjustable versions and connects directly to the 5V output. Internally, it references a precise 2.42V bandgap to regulate output voltage within ±1.2%. It also enables foldback protection: when SENSE voltage drops below 1.7V, peak current limit decreases; below 1V, switching frequency folds back ~5:1 to limit power dissipation during faults.
Is thermal management critical for the LT1374CR#PBF in high-current operation?
Yes - thermal management is essential. The LT1374CR#PBF uses a 16-pin TSSOP with exposed pad (FE16 package), and its θJA drops from >40°C/W to ≤30°C/W only when the exposed pad is soldered to a minimum 0.5 in² copper ground plane. At 4.25A output, junction temperature can exceed 125°C without adequate heatsinking, triggering thermal shutdown. Layout guidelines mandate short, wide traces for VIN, VSW, GND, and BOOST paths.
LT1374CR#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:
- 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#PBF FAQ
1.How can I place an order for LT1374CR#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CR#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 LT1374CR#PBF reliable?
The price and inventory of LT1374CR#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CR#PBF is usually 5 days.
3.What payment methods are accepted for LT1374CR#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CR#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CR#PBF?
LT1374CR#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CR#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 LT1374CR#PBF?
For technical support, including LT1374CR#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CR#PBF requirements.
6.How does Aetrix verify that LT1374CR#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374CR#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 LT1374CR#PBF meets industry standards.
7.What is the process for return or replacement of LT1374CR#PBF?
All LT1374CR#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CR#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 LT1374CR#PBF part is unused and in its original packaging.
Return procedure for LT1374CR#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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