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Analog Devices Inc. LT1374IS8#TRPBF
- Part No.:
- LT1374IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374IS8#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,691
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Product details
Overview
LT1374IS8#TRPBF 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, features cycle-by-cycle current limiting, 20µA shutdown current, and uses an external boost capacitor to saturate the switch for low 0.07Ω on-resistance. It targets compact, high-efficiency DC/DC conversion in battery-powered systems.
For engineers reviewing the LT1374IS8#TRPBF datasheet, LT1374IS8#TRPBF pinout, LT1374IS8#TRPBF application, or LT1374IS8#TRPBF equivalent, key selection considerations include its fixed 5V SENSE-pin configuration, SO-8 thermal performance (θJA = 80°C/W with fused ground), 500kHz constant-frequency operation, and compatibility with standard surface-mount inductors down to 1.8µH - critical for portable computing and distributed power designs.
Technical Context
The LT1374IS8#TRPBF implements current-mode control with an internal 2.42V reference and dedicated SENSE pin (not FB) for fixed 5V regulation, enabling fast transient response and inherent loop stability. Its bipolar NPN switch is driven via a BOOST pin requiring an external diode-capacitor network to achieve saturation and minimize conduction loss.
It integrates undervoltage lockout (2.38V threshold), thermal shutdown, and dual shutdown thresholds (0.4V full shutdown, 2.38V UVLO). The SO-8 package uses fused ground (FGND) for improved thermal dissipation and EMI control, with VIN and GND pins internally connected across two leads to reduce trace inductance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (SENSE pin tied directly to VOUT) |
| Switch Current Limit | 4.5A typical at ≤50% duty cycle; derates nonlinearly above 50% due to slope compensation |
| Switching Frequency | 500kHz nominal (460–540kHz over temp); constant-frequency operation enables predictable EMI filtering |
| Input Voltage Range | 6V to 25V - minimum start-up voltage is 5.5V; supports 12V and 24V industrial rails |
| Shutdown Current | 20µA max at TJ = 125°C - enables ultra-low-power standby in battery systems |
| Switch On Resistance | 0.07Ω typical at ISW = 4.5A - achieved via BOOST-driven saturation, reducing conduction loss vs. standard bipolar |
| Thermal Resistance | θJA = 80°C/W with fused ground pin connected to PCB ground plane - requires FGND soldering for rated performance |
Pinout & Package
LT1374IS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with fused ground (FGND) pin for enhanced thermal and EMI performance. The package includes dual VIN and dual GND pins (pins 1 & 8, 4 & 5 respectively) to minimize parasitic inductance in high-dI/dt paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 8) | Power switch collector & IC supply input | Must be bypassed locally; both pins must be shorted on PCB to handle high peak currents and reduce voltage spikes |
| BOOST (Pin 2) | Switch driver bootstrap supply | Requires external diode + capacitor (e.g., CMDSH3 + 0.27µF) to generate >VIN voltage for NPN saturation |
| FGND (Pins 4, 5) | Fused ground reference | Internally connected; must be soldered to large copper area for θJA = 80°C/W rating and low-impedance return path |
| VSW (Pin 3) | Switch emitter output | Drives inductor; negative swing clamped by external catch diode (e.g., MBRS330T3); max –0.8V allowed |
| VC (Pin 6) | Error amplifier output / current limit setpoint | Used for loop compensation; also serves as shutdown override (pull to GND disables regulation) |
| SYNC/SHDN (Pin 7) | Multi-function logic input | Configured as SHDN on LT1374IS8#TRPBF: 0.4V triggers full shutdown; 2.38V enables UVLO |
| SENSE (Pin 8) | Fixed 5V output feedback | Replaces FB pin on -5 variants; connected directly to regulated 5V output; 5.0V ±1.2% tolerance |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables stable operation with wide input/output ranges and fast load transient response without external compensation |
| Integrated 4.5A NPN switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout complexity in space-constrained designs |
| BOOST-driven saturation | Achieves 0.07Ω effective RCE(sat), improving efficiency to >89% at 5V/3A vs. ~75% in conventional bipolar regulators |
| Cycle-by-cycle current limiting | Provides robust short-circuit protection without external sensing; folds back frequency and current below 1V SENSE |
| Fused ground (FGND) SO-8 | Reduces thermal resistance by 30% vs. standard SO-8 and lowers ground bounce in high-speed switching |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Point-of-load (POL) conversion from 12V or 19V adapter to 5V for USB peripherals and I/O logic. IC Role / Device Role / Timing Role: Fixed-output buck regulator providing regulated 5V rail with tight load regulation and fast transient recovery. Use Value: Delivers 4.25A at 5V with <1.2% output tolerance and 20µA shutdown current, extending runtime between charges. |
Use Scenario: Power management in handheld test equipment with Li-ion battery input (8–12.6V). IC Role / Device Role / Timing Role: Primary 5V system rail generator with UVLO and thermal protection for safe operation under variable load and temperature. Use Value: Maintains regulation down to 6V input while delivering >89% efficiency at mid-load, minimizing heat buildup in sealed enclosures. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V supply for charger controller ICs and status LEDs in multi-cell Li-ion charging modules. IC Role / Device Role / Timing Role: Compact, self-contained 5V source with shutdown control synchronized to charge state signals. Use Value: Enables zero-quiescent-current sleep mode via SHDN pin, reducing system standby drain to <25µA. |
Use Scenario: Local 5V rail generation on remote sensor nodes powered from 24V industrial bus. IC Role / Device Role / Timing Role: High-reliability buck converter operating continuously across –40°C to 125°C junction range. Use Value: Rated for industrial temperature grade (LT1374I), with guaranteed 4.5A switch current and thermal shutdown at 125°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1374CS8-5#PBF | Commercial-grade (0°C to 125°C) version with identical electrical specs and SO-8 package | Lacks extended –40°C low-temp capability; unsuitable for outdoor or automotive environments | Select only for cost-sensitive, non-industrial applications where ambient temperature stays above 0°C |
| LT3502AIS8#PBF | Pin-compatible 500kHz buck with 5V fixed output, but uses MOSFET switch (0.12Ω), lower 3.5A current limit, and no BOOST pin | Requires no external boost diode/capacitor; simpler layout but lower max output current and efficiency at high load | Prefer when board space is extremely limited and peak load ≤3.5A; avoid if >4A sustained current is required |
Compared with LT1374CS8-5#PBF, the LT1374IS8#TRPBF provides guaranteed operation down to –40°C and tighter parametric consistency over temperature; compared with LT3502AIS8#PBF, it delivers higher output current (4.5A vs. 3.5A) and superior efficiency via BOOST-saturated bipolar switch, at the cost of one extra external component.
Availability
LT1374IS8#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed industrial power systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.
Supply support for LT1374IS8#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 technical and manufacturing continuity for the LT product line, renowned for high-performance analog and power management ICs.
The LT1374 series was designed specifically for high-efficiency, compact buck conversion in space- and thermally constrained applications, emphasizing integrated power switches, current-mode stability, and robust protection features for industrial and portable use.
FAQ
What is the maximum output current of the LT1374IS8#TRPBF at 5V?
The LT1374IS8#TRPBF delivers up to 4.25A at 5V output under typical conditions with VIN = 10V and L = 5µH. Maximum switch current is 4.5A at ≤50% duty cycle, but available load current decreases with higher input voltage due to increased inductor ripple. For example, at VIN = 15V and VOUT = 5V (33% duty cycle), peak switch current remains 4.5A, yielding ~4.25A continuous output in continuous conduction mode.
Does the LT1374IS8#TRPBF require an external boost capacitor?
Yes, the LT1374IS8#TRPBF requires an external boost capacitor (e.g., 0.27µF ceramic) and diode (e.g., CMDSH3) 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 circuit results in significantly higher conduction loss and thermal stress.
How does the shutdown function work on the LT1374IS8#TRPBF?
The LT1374IS8#TRPBF uses pin 7 (SYNC/SHDN) as a shutdown input. Pulling this pin below 0.4V forces full micropower shutdown with supply current reduced to 20µA max. A second threshold at 2.38V provides accurate undervoltage lockout (UVLO), disabling switching until input voltage rises above this level. Both thresholds are guaranteed over the full –40°C to 125°C junction temperature range.
What is the purpose of the fused ground (FGND) pins on the LT1374IS8#TRPBF SO-8 package?
The LT1374IS8#TRPBF SO-8 package features fused ground (FGND) on pins 4 and 5 to provide a low-inductance, high-current return path for the power switch and improve thermal dissipation. Connecting FGND to a large PCB copper area achieves θJA = 80°C/W. This design minimizes ground bounce during high-dI/dt switching transitions and reduces EMI radiation compared to standard SO-8 layouts.
Can the LT1374IS8#TRPBF be synchronized to an external clock?
No, the LT1374IS8#TRPBF does not support external synchronization. Its pin 7 is configured exclusively as SHDN (shutdown), not SYNC. Synchronization capability is only available on variants designated with "-SYNC" (e.g., LT1374IS8-SYNC), where the SHDN function is replaced by a logic-compatible SYNC input supporting 580kHz to 1MHz external clock signals.
LT1374IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1374IS8#TRPBF FAQ
1.How can I place an order for LT1374IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374IS8#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 LT1374IS8#TRPBF reliable?
The price and inventory of LT1374IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374IS8#TRPBF?
LT1374IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374IS8#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 LT1374IS8#TRPBF?
For technical support, including LT1374IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374IS8#TRPBF requirements.
6.How does Aetrix verify that LT1374IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374IS8#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 LT1374IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374IS8#TRPBF?
All LT1374IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374IS8#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 LT1374IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1374IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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