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Analog Devices Inc. LT1375IS8-5#TRPBF
- Part No.:
- LT1375IS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375IS8-5#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,740
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Product details
Overview
LT1375IS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 1.5A, 500kHz monolithic buck switching regulator in an 8-pin SOIC package. It integrates a saturated bipolar NPN power switch (0.4Ω typical RDS(on) equivalent), current-mode control, cycle-by-cycle current limiting, and thermal shutdown. Designed for battery-powered systems requiring compact, efficient DC/DC conversion from 6V–25V input to stable 5V output.
For engineers reviewing the LT1375IS8-5#TRPBF datasheet, LT1375IS8-5#TRPBF pinout, LT1375IS8-5#TRPBF application, or LT1375IS8-5#TRPBF equivalent, key selection criteria include its guaranteed 5.0V ±1.2% output accuracy over temperature, 20µA shutdown current, 500kHz constant-frequency operation, and compatibility with standard surface-mount 5µH inductors and low-ESR tantalum output capacitors.
Technical Context
The LT1375IS8-5#TRPBF implements current-mode control with an internal 500kHz oscillator and a dedicated error amplifier (2000 µMho transconductance). Its architecture uses BOOST pin-driven saturation of the on-die NPN switch to achieve low conduction loss-enabling >87% efficiency at 1A load with 10V input. The fixed 5V output eliminates external feedback resistors, using an internal voltage divider referenced to a 2.42V bandgap.
It features dual-threshold shutdown: 2.38V UVLO for reliable start-up sequencing and 0.4V micropower disable. Frequency foldback below 1V FB voltage and current limit reduction below 1.7V FB provide robust short-circuit protection without external circuitry. Thermal shutdown and cycle-by-cycle current limiting ensure safe operation under fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (guaranteed over –40°C to 125°C junction temp) |
| Max Output Current | 1.5A continuous (at ≤50% duty cycle); derates to 1.35A at 80% duty cycle |
| Switching Frequency | 500kHz ±10% (constant, no external timing components required) |
| Input Voltage Range | 6V to 25V (minimum 5.0V startup; supports 12V nominal battery rails) |
| Shutdown Current | 20µA typical (ensures ultra-low quiescent drain in portable sleep modes) |
| Switch On Resistance | 0.4Ω typical (achieved via BOOST pin drive; enables high efficiency with bipolar process) |
| Efficiency @ 1A | 87% typical at VIN = 10V, VOUT = 5V, L = 10µH (reduces thermal load vs. older buck regulators) |
Pinout & Package
LT1375IS8-5#TRPBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad thermal enhancement. Pin 1 is marked by a beveled corner. GND pins (pins 3 and 8) must be connected to a low-impedance ground plane to ensure stable regulation and minimize EMI.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Boost capacitor drive node | Supplies >VIN gate drive to saturate internal NPN switch; requires external 10nF–100nF capacitor to VIN |
| 2: VIN | Main power input | Collector of internal NPN switch; powers IC bias circuitry; bypass with ≥10µF low-ESR capacitor |
| 3: VSW | Switch emitter node | Connects to inductor; swings negative during off-time; requires catch diode (e.g., 1N5818) |
| 4: BIAS | Not connected (NC) | No internal connection; leave unconnected or tie to GND per layout best practice |
| 5: VC | Error amplifier output | Controls peak switch current; used for loop compensation (typical 1nF–10nF to GND) |
| 6: FB/SENSE | 5V output sense input | Internally connected to 5V output; monitors regulation; triggers foldback below 1.7V |
| 7: GND | Analog/digital reference | Primary ground return; must be star-connected to output capacitor negative terminal |
| 8: SHDN | Logic-level enable/disable | Active-high: ≥2.38V enables; ≤0.4V disables (20µA IQ); 2.38V threshold serves as UVLO |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with internal divider | Eliminates external feedback resistors-reducing BOM count and layout sensitivity |
| BOOST-driven saturated NPN switch | Delivers 0.4Ω effective on-resistance using bipolar process-achieving FET-like efficiency without silicon area penalty |
| Current-mode control with slope compensation | Ensures stable operation across full load range and input voltage; enables fast transient response to load steps |
| Dual-threshold shutdown (UVLO + micropower) | 2.38V UVLO prevents erratic start-up at marginal input; 0.4V deep-sleep mode cuts supply current to 20µA |
| Integrated short-circuit protection | Frequency foldback (<1V FB) and current limit reduction (<1.7V FB) limit power dissipation during faults without external components |
Applications
| Battery-Powered Portable Computers | Industrial Distributed Power Rails |
|---|---|
Use Scenario: Powering 5V logic, USB peripherals, and display controllers in handheld terminals operating from 7.2V Li-ion packs. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated output with tight load/line regulation and low-noise switching. Use Value: 87% efficiency at 1A reduces heat buildup in sealed enclosures; 20µA shutdown extends battery life during idle periods. | Use Scenario: Generating local 5V supplies for PLC I/O modules powered from 24V industrial bus rails. IC Role / Device Role / Timing Role: Compact, rugged DC/DC stage converting wide-input 24V±20% to stable 5V for microcontroller and sensor interfaces. Use Value: 6V–25V input range accommodates brownout and surge conditions; thermal shutdown protects against ambient overheating. |
| Automotive Body Control Modules | Medical Portable Diagnostic Devices |
Use Scenario: Supplying 5V to CAN transceivers and microcontrollers in automotive door modules exposed to 12V battery transients. IC Role / Device Role / Timing Role: Input-filtered buck regulator handling load dump (up to 25V) and cold-crank (down to 6V) without dropout. Use Value: Guaranteed operation across –40°C to +125°C junction temperature ensures reliability in under-hood environments. | Use Scenario: Providing clean 5V power to ADCs, op-amps, and wireless radios in handheld ultrasound or glucose meters. IC Role / Device Role / Timing Role: Low-noise, low-quiescent regulator minimizing interference with sensitive analog front-ends. Use Value: Fixed 5V output eliminates resistor tolerance errors; current-mode control suppresses noise coupling into signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#TRPBF | Higher efficiency (92%), 3MHz switching, integrated MOSFETs; requires external compensation | Supports smaller inductors/caps; better suited for space-constrained designs with <500mA loads | Select if board area is critical and load current ≤500mA; not drop-in due to different pinout and compensation requirements |
| TPS54202DRCT | 2A output, 4.5–17V input, integrated FETs, 500kHz sync capability; lower quiescent current (40µA) | Wider input range and higher current; lacks internal 5V reference-requires external feedback network | Choose when adjustable output or higher current is needed; requires redesign of feedback and compensation network |
Compared with LTC3605EDE-5#TRPBF and TPS54202DRCT, LT1375IS8-5#TRPBF offers proven ruggedness in industrial temperature range, fixed 5V simplicity, and bipolar-switch robustness against voltage transients-making it optimal for cost-sensitive, medium-current 5V rails where layout simplicity and thermal resilience are prioritized over ultra-small size or sub-100mA quiescent current.
Availability
LT1375IS8-5#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable computers, industrial distributed power rails, automotive body control modules, and medical portable diagnostic devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1375IS8-5#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 full support for legacy Linear power products. Linear pioneered high-performance analog ICs with emphasis on precision, efficiency, and ruggedness.
The LT1375 series belongs to Linear's monolithic buck regulator product line, designed specifically for compact, high-efficiency DC/DC conversion in space- and thermal-constrained applications where fixed 5V output, wide input range, and robust fault protection are essential.
FAQ
What is the guaranteed output voltage accuracy of the LT1375IS8-5#TRPBF over temperature?
The LT1375IS8-5#TRPBF guarantees 5.0V output with ±1.2% accuracy across its full operating junction temperature range of –40°C to +125°C. This specification is verified in the Electrical Characteristics table under "Sense Voltage (Fixed 5V)" and applies with VIN = 6V–25V and load current up to 1.5A. No external trimming or calibration is required to meet this tolerance.
Can the LT1375IS8-5#TRPBF operate from a 5V input source?
No-the LT1375IS8-5#TRPBF has a minimum input voltage of 6V (with 5.0V guaranteed startup). Attempting to operate below 6V will cause regulation failure and potential instability. For 5V-input applications, consider the LT1507, which is functionally identical but rated for 4.5V–12V input and delivers the same 5V output.
Does the LT1375IS8-5#TRPBF require an external BOOST capacitor, and what value is recommended?
Yes-the LT1375IS8-5#TRPBF requires an external ceramic capacitor (typically 10nF–100nF) between BOOST and VIN to generate the boosted gate drive voltage needed for NPN switch saturation. A 22nF X7R capacitor placed adjacent to the BOOST and VIN pins is recommended for optimal efficiency and EMI performance per Linear's application schematics.
How does the LT1375IS8-5#TRPBF handle short-circuit conditions?
The LT1375IS8-5#TRPBF employs dual-foldback protection: when FB/SENSE voltage drops below 1.7V, peak switch current is reduced; below 1V, switching frequency folds back ~5:1. This limits power dissipation in the IC, catch diode, and inductor during sustained shorts. Combined with cycle-by-cycle current limiting and thermal shutdown, it safely withstands continuous output faults without damage.
Is the LT1375IS8-5#TRPBF pin-compatible with other members of the LT1375/LT1376 family?
Yes-the LT1375IS8-5#TRPBF shares identical pinout and footprint with all S8-package variants in the LT1375/LT1376 family (e.g., LT1375CS8-5, LT1376IS8-5). However, note that LT1375 parts lack the BIAS pin function (it is NC), while LT1376 parts use BIAS for efficiency optimization. Swapping between LT1375 and LT1376 variants requires verifying external circuit compatibility.
LT1375IS8-5#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:
- 1.5A (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
LT1375IS8-5#TRPBF FAQ
1.How can I place an order for LT1375IS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375IS8-5#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 LT1375IS8-5#TRPBF reliable?
The price and inventory of LT1375IS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375IS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1375IS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375IS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375IS8-5#TRPBF?
LT1375IS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375IS8-5#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 LT1375IS8-5#TRPBF?
For technical support, including LT1375IS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375IS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1375IS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1375IS8-5#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 LT1375IS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1375IS8-5#TRPBF?
All LT1375IS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375IS8-5#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 LT1375IS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1375IS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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