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Analog Devices Inc. LT1374CS8#PBF
- Part No.:
- LT1374CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374CS8#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:186
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Product details
Overview
LT1374CS8#PBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with integrated 4.5A NPN power switch, current-mode control, 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. Used in portable computers and battery-powered systems requiring compact, high-efficiency DC/DC conversion.
For engineers reviewing the LT1374CS8#PBF datasheet, LT1374CS8#PBF pinout, LT1374CS8#PBF application, or LT1374CS8#PBF equivalent, key selection criteria include its fixed 5V output configuration, SO-8 package with fused ground pin, 0.07Ω switch on-resistance, 500kHz constant-frequency operation, and support for external synchronization or shutdown via shared SYNC/SHDN pin.
Technical Context
The LT1374CS8#PBF implements current-mode control using an internal error amplifier (2000 µMho transconductance), peak-current sensing, and slope compensation to prevent subharmonic oscillation. Its bipolar NPN switch is driven by a BOOST pin voltage ≥5V above VIN to ensure saturation and minimize conduction loss.
It integrates oscillator, logic, and protection circuitry-including undervoltage lockout (2.38V threshold), thermal shutdown, and dual shutdown thresholds (0.4V full shutdown, 2.38V UVLO). The BIAS pin (available in SO-8) enables efficiency optimization by sourcing bias current from the regulated output when VOUT ≥3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (SENSE pin referenced; no external divider required) |
| Switch Current Limit | 4.5A typical at ≤50% duty cycle; derates nonlinearly to ~3.7A at 80% duty cycle |
| Switch On Resistance | 0.07Ω typical at 4.5A - enables high efficiency (>89%) via saturated NPN operation |
| Switching Frequency | 500kHz ±8% - enables use of small 5–10µH inductors and reduces EMI fundamental |
| Shutdown Current | 20µA max at VIN ≤25V - supports ultra-low-power standby in battery systems |
| Input Voltage Range | 6V to 25V - compatible with 12V rail and wide-input industrial/battery sources |
| Efficiency @ 5V/2A | ≥90% typical at VIN = 12V - achieved via BOOST-driven saturation and low quiescent current |
Pinout & Package
LT1374CS8#PBF is housed in an 8-lead plastic SOIC (SO-8) package with fused ground pin (FGND) for improved thermal performance (θJA = 80°C/W with FGND connected to ground plane). The exposed fused ground tab enhances power dissipation and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply and switch collector | Accepts 6–25V; powers internal circuitry; high dI/dt node requiring local bypass |
| BOOST | Switch driver boost supply | Must be ≥5V above VIN via external capacitor/diode to saturate NPN switch |
| FGND | Fused ground reference | Primary GND connection; must be soldered to large copper area for thermal/EMI control |
| VSW | Switch emitter | Drives inductor; swings negative during off-time; clamped by external catch diode |
| VC | Error amplifier output / current limit setpoint | Used for loop compensation; also serves as current clamp or override control point |
| BIAS | Internal bias supply input | Connect to VOUT ≥3.3V to improve efficiency at high VIN/light load |
| SYNC/SHDN | Multi-function logic pin | Logic-high (>1.5V) enables sync; logic-low (<0.6V) initiates shutdown; 2.38V UVLO threshold |
| SENSE | Fixed 5V output feedback | Direct connection to 5V output; replaces FB pin in -5 variants; sets regulation point at 5.0V |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables fast transient response and inherent loop stability without external compensation |
| BOOST-driven saturation | Reduces switch VCE drop to ~0.3V at 4.5A, improving efficiency over conventional bipolar designs |
| Integrated protection | Includes cycle-by-cycle current limiting, thermal shutdown, and dual-threshold shutdown (UVLO + deep sleep) |
| Flexible logic interface | Single SYNC/SHDN pin supports either external clock synchronization (580kHz–1MHz) or micropower shutdown |
| BIAS pin efficiency boost | Redirects internal bias current from VIN to VOUT, improving efficiency >10% at VIN=20V/VOUT=5V/IOUT=25mA |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded controllers and peripherals in clamshell laptops and tablets. IC Role / Device Role / Timing Role: Fixed 5V buck converter supplying I/O rails and USB interfaces with tight load transient response. Use Value: 500kHz switching allows compact 5µH inductor and low-profile tantalum output capacitors, minimizing board area. |
Use Scenario: Power management in handheld test equipment and portable medical monitors operating from Li-ion packs. IC Role / Device Role / Timing Role: Primary 5V system rail generator with 20µA shutdown current enabling multi-week standby life. Use Value: Integrated UVLO (2.38V) prevents brownout operation during battery discharge, ensuring reliable system reset behavior. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V supply for charger IC control logic and status LEDs in multi-cell Li-ion charging stations. IC Role / Device Role / Timing Role: Isolated 5V rail generator accepting wide-input 9–24V adapter input. Use Value: 25V absolute max VIN and robust 4.5A switch enable direct use after front-end rectification without pre-regulation. |
Use Scenario: Local point-of-load regulation in industrial PLC backplanes and modular sensor nodes. IC Role / Device Role / Timing Role: Compact 5V DC/DC stage converting 12V or 24V distributed bus to logic supply. Use Value: SO-8 fused ground package provides adequate thermal margin at 4.25A without heatsink, simplifying mechanical design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1374IS8#PBF | Same architecture and pinout, but rated for –40°C to 125°C junction temperature (vs. 0°C to 125°C for LT1374CS8#PBF) | Suitable for extended-temperature industrial or automotive under-hood environments | Select LT1374IS8#PBF when operation below 0°C or above 85°C ambient is required |
| LT1374CS8-5#PBF | Identical part number variant - "CS8-5" is the official marking for fixed 5V SO-8 version; LT1374CS8#PBF is functionally identical per Linear datasheet nomenclature | No functional difference; same electrical specs, thermal limits, and PCB footprint | LT1374CS8#PBF and LT1374CS8-5#PBF are interchangeable in all designs |
Compared with LT1374IS8#PBF, the LT1374CS8#PBF offers lower cost for commercial-temperature applications, while LT1374CS8-5#PBF is not a true alternative but a naming variant - both share identical silicon, SO-8 packaging, 5V fixed output, and 4.5A capability.
Availability
LT1374CS8#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 traceable sourcing.
Supply support for LT1374CS8#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 line, including precision analog, power management, and signal conditioning ICs.
The LT1374CS8#PBF belongs to Linear's monolithic switching regulator family, designed specifically for high-efficiency, compact DC/DC conversion in space-constrained and thermally demanding applications where integrated power switches and robust protection are essential.
FAQ
What is the output voltage accuracy of the LT1374CS8#PBF?
The LT1374CS8#PBF provides a fixed 5.0V output with ±1.2% tolerance over temperature and line conditions. This is achieved via internal trimming of the SENSE pin reference, which is factory-set to 5.0V ±0.1V (4.94V to 5.06V) at 25°C and maintained across –40°C to 125°C junction range. No external resistors are needed, eliminating drift from component aging or thermal mismatch.
Can the LT1374CS8#PBF be synchronized to an external clock?
Yes, the LT1374CS8#PBF supports external synchronization via its SYNC/SHDN pin. When configured as SYNC (logic-high >1.5V), it accepts TTL/CMOS-compatible signals from 580kHz to 1MHz, allowing noise-sensitive systems to align switching edges and reduce beat frequencies. The LT1374CS8#PBF retains its internal 500kHz oscillator when SYNC is inactive, and no additional components are required for basic sync operation.
What is the minimum input voltage required for the LT1374CS8#PBF to regulate 5V output?
The LT1374CS8#PBF requires a minimum input voltage of 5.5V to maintain regulation at 5V output under full load, as specified in the Electrical Characteristics table. Below this, internal bias lines lose regulation, causing oscillator frequency drift and potential dropout. At light loads, startup may occur as low as 5.0V, but sustained operation at VIN <5.5V risks instability and reduced current limit - always verify with actual load and temperature conditions.
How does the BOOST pin function in the LT1374CS8#PBF?
The BOOST pin in the LT1374CS8#PBF supplies a voltage ≥5V above VIN to the base drive of the internal NPN switch, forcing deep saturation and reducing VCE(sat) to ~0.3V at 4.5A. This is implemented with an external flying capacitor and Schottky diode (e.g., MBRS330T3). Without BOOST, efficiency drops significantly due to higher conduction loss - the LT1374CS8#PBF relies on this pin for its specified 0.07Ω effective on-resistance and >89% peak efficiency.
Does the LT1374CS8#PBF include thermal protection?
Yes, the LT1374CS8#PBF incorporates full thermal shutdown protection that disables switching when junction temperature exceeds 125°C (TJMAX). Recovery occurs automatically once temperature falls below ~115°C hysteresis. This protection is independent of current limit and operates even during short-circuit faults. Combined with cycle-by-cycle current limiting and UVLO, it ensures robust fault handling without external supervision circuits in the LT1374CS8#PBF design.
LT1374CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SO
LT1374CS8#PBF FAQ
1.How can I place an order for LT1374CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374CS8#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 LT1374CS8#PBF reliable?
The price and inventory of LT1374CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1374CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374CS8#PBF?
LT1374CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374CS8#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 LT1374CS8#PBF?
For technical support, including LT1374CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374CS8#PBF requirements.
6.How does Aetrix verify that LT1374CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1374CS8#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 LT1374CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1374CS8#PBF?
All LT1374CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374CS8#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 LT1374CS8#PBF part is unused and in its original packaging.
Return procedure for LT1374CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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