My Inquiry
My Account
Analog Devices Inc. LT1374IS8-5#TRPBF
- Part No.:
- LT1374IS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1374IS8-5#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 4.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,696
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1374IS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 4.5A monolithic buck switching regulator in an 8-pin SOIC package, featuring constant 500kHz current-mode operation, 0.07Ω internal switch on-resistance, 2.5mA typical operating supply current, and integrated cycle-by-cycle current limiting for portable computers and battery-powered systems.
For engineers reviewing the LT1374IS8-5#TRPBF datasheet, LT1374IS8-5#TRPBF pinout, LT1374IS8-5#TRPBF application, or LT1374IS8-5#TRPBF equivalent, this page delivers verified specifications, thermal performance data, shutdown behavior, feedback-sense interface details, and real-world inductor sizing guidance for 5V distributed power designs.
Technical Context
The LT1374IS8-5#TRPBF implements a current-mode control architecture with internal 2.42V reference and dedicated SENSE pin (replacing FB for fixed 5V output), enabling fast transient response and inherent loop stability without external compensation. Its bipolar NPN power switch uses BOOST pin voltage boosting to achieve saturation and low conduction loss.
It integrates undervoltage lockout (2.38V threshold), micropower shutdown (0.4V threshold), and optional synchronization capability (replacing SHDN on -SYNC variants). The device operates across –40°C to 125°C junction temperature and supports input voltages from 6V to 25V with 5V ±2% output regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (guaranteed over line, load, temp) |
| Max Output Current | 4.5A at ≤50% duty cycle; derates to 3.7A at 80% duty cycle |
| Switching Frequency | 500kHz ±8% (constant frequency, no jitter accumulation) |
| Internal Switch RDS(on) | 0.07Ω typ (enables >89% efficiency at 5V/3A, VIN=12V) |
| Shutdown Current | 20µA max (reduces system standby power in battery applications) |
| Input Voltage Range | 6V to 25V (minimum start-up voltage ~5.5V, per test conditions) |
| Thermal Range | –40°C to +125°C operating junction temperature |
Pinout & Package
LT1374IS8-5#TRPBF is housed in an 8-lead plastic SOIC (S8) package with fused ground pin (FGND) for improved thermal dissipation (θJA = 80°C/W with FGND connected to ground plane).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power collector | Supplies internal circuitry and powers NPN switch; requires local 100µF solid tantalum bypass |
| BOOST | Switch driver boost node | Connected to external capacitor/diode network to saturate internal NPN; must exceed VIN by ≥5V |
| FGND | Fused ground reference | Primary GND return; must be soldered to large copper area for thermal and EMI control |
| VSW | Switch emitter output | Drives external catch diode and inductor; clamped to –0.8V max during off-time |
| VC | Error amplifier output | Controls peak switch current; used for loop compensation or current clamp override |
| BIAS | Efficiency-boost bias input | Accepts regulated output (≥3.3V) to reduce VIN supply current and improve light-load efficiency |
| SYNC/SHDN | Multi-function logic input | On LT1374IS8-5#TRPBF: configured as SHDN (0.4V shutdown, 2.38V UVLO) |
| SENSE | Fixed-output feedback node | Direct connection to 5V output; replaces FB pin; enables 5V regulation without external divider |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control | Enables stable operation with wide input/output ranges and fast load transient recovery (<10µs) |
| Integrated slope compensation | Prevents subharmonic oscillation up to 90% duty cycle without external components |
| BOOST-driven saturation | Reduces switch VCE(sat) to ~0.3V at 4.5A, cutting conduction loss vs. standard bipolar designs |
| Frequency foldback | Automatically reduces switching frequency 5:1 when SENSE <1V, limiting power dissipation during short-circuit |
| Two-threshold shutdown | Separate 2.38V (UVLO) and 0.4V (deep shutdown) thresholds enable precise input sequencing and ultra-low standby |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded controllers and peripherals in clamshell notebooks with 12V battery input. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering up to 4.25A with thermal shutdown and cycle-by-cycle current limiting. Use Value: Enables compact layout using 5µH inductor and eliminates need for external feedback resistors due to integrated SENSE function. | Use Scenario: Power management in handheld test equipment requiring stable 5V rail from 7.2V Li-ion pack under varying load and temperature. IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator with –40°C to 125°C operation and 20µA shutdown current for extended battery life. Use Value: Maintains regulation down to 6V input while sustaining >85% efficiency at 2A, reducing thermal stress in sealed enclosures. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V supply for charging controller ICs and status LEDs in multi-cell lithium battery chargers. IC Role / Device Role / Timing Role: Secondary regulator powered from main charger's intermediate bus (e.g., 15V), providing isolated 5V for logic and sensing. Use Value: Tolerates 25V transients on VIN and delivers clean 5V output with <1% ripple via 10µF–50µF output capacitance. | Use Scenario: Point-of-load conversion in industrial PLC backplanes where 24V bus supplies multiple 5V subsystems. IC Role / Device Role / Timing Role: High-current buck stage with fused ground pin (FGND) for robust thermal performance in high-density layouts. Use Value: Delivers full 4.5A continuously with θJA = 80°C/W when FGND is tied to 1-in² copper pour, avoiding derating at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3866EFE#PBF | External MOSFET drive, 55V max input, no integrated switch; requires external FETs and compensation | Used in higher-power or wider-input applications where adjustable output and PMBus support are needed | Select only if >5A output, >25V input, or digital control are required; not drop-in compatible |
| MP2315GJ-Z | 40V max input, 3.5A integrated switch, 500kHz fixed frequency, but lacks BIAS pin and BOOST architecture | Suitable for cost-sensitive consumer electronics where 5V/3.5A suffices and efficiency above 85% is acceptable | Choose for lower BOM cost and smaller footprint; verify thermal performance at 4.5A since rated max is 3.5A |
Compared with LTC3866EFE#PBF and MP2315GJ-Z, the LT1374IS8-5#TRPBF uniquely combines 4.5A integrated switching, BOOST-enabled saturation for high efficiency at 5V, and –40°C to 125°C operation in a standard SOIC-8 - making it optimal for ruggedized 5V power delivery where layout simplicity and thermal reliability are critical.
Availability
LT1374IS8-5#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 guaranteed traceable sourcing.
Supply support for LT1374IS8-5#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 its high-performance analog and power management product lines with rigorous qualification and long-term support.
The LT1374 family was designed specifically for high-efficiency, high-current step-down conversion in space-constrained, thermally demanding environments - emphasizing robustness, integrated protection, and minimal external component count for 5V and adjustable-output applications.
FAQ
What is the maximum continuous output current of the LT1374IS8-5#TRPBF?
The LT1374IS8-5#TRPBF delivers up to 4.5A continuously at duty cycles ≤50% (e.g., VOUT=5V, VIN≤10V). At higher input voltages-such as VIN=15V (67% duty cycle)-the maximum switch current derates to ~4.3A per the nonlinear slope-compensation formula. Full 4.5A operation requires proper thermal design: FGND must connect to ≥1-in² copper area to maintain θJA ≤80°C/W.
Does the LT1374IS8-5#TRPBF require external feedback resistors for 5V output?
No. The LT1374IS8-5#TRPBF uses an internal resistor divider and the SENSE pin (not FB) for fixed 5V regulation. The SENSE pin connects directly to the output, eliminating external resistors and associated tolerance errors. This configuration is factory-trimmed to deliver 5.0V ±2% across line, load, and temperature - confirmed in the Electrical Characteristics table under "Sense Voltage (Fixed 5V)".
How does the BOOST pin function in the LT1374IS8-5#TRPBF?
The BOOST pin on the LT1374IS8-5#TRPBF supplies a boosted gate drive voltage to the internal NPN switch, enabling saturation and reducing conduction loss to ~0.07Ω. It must be biased 5V above VIN via an external diode and capacitor. Without BOOST, switch VCE(sat) rises to ~1.5V, dropping efficiency from >89% to ~75%. The BOOST pin draws 90–140mA at 4.5A switch current, per the datasheet's Boost Current specification.
What is the purpose of the BIAS pin on the LT1374IS8-5#TRPBF?
The BIAS pin on the LT1374IS8-5#TRPBF allows the IC to draw bias current from the regulated 5V output instead of VIN, improving light-load efficiency - especially when VIN ≫ VOUT (e.g., VIN=20V, VOUT=5V). When BIAS is connected to 5V, VIN supply current drops by ~3.2mA, yielding >10% efficiency gain at 25mA load. BIAS requires ≥3.3V and is only available on SO-8 and TSSOP packages, not DD or TO-220.
Can the LT1374IS8-5#TRPBF be synchronized to an external clock?
No - the standard LT1374IS8-5#TRPBF has SHDN functionality on Pin 7 (SYNC/SHDN). Synchronization requires the -SYNC variant (e.g., LT1374IS8-SYNC or LT1374IS8-5 SYNC), where Pin 7 is reconfigured as a logic-compatible SYNC input (10–90% duty cycle, 580kHz–1MHz range). Using an external clock on the LT1374IS8-5#TRPBF will force shutdown; always verify part marking (e.g., "374I5" = -5, "374ISN" = -SYNC) before board design.
LT1374IS8-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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
LT1374IS8-5#TRPBF FAQ
1.How can I place an order for LT1374IS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1374IS8-5#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 LT1374IS8-5#TRPBF reliable?
The price and inventory of LT1374IS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1374IS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1374IS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1374IS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1374IS8-5#TRPBF?
LT1374IS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1374IS8-5#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 LT1374IS8-5#TRPBF?
For technical support, including LT1374IS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1374IS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1374IS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1374IS8-5#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 LT1374IS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1374IS8-5#TRPBF?
All LT1374IS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1374IS8-5#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 LT1374IS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1374IS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1374IS8-5#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
