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Analog Devices Inc. LT1375HVCS8#TRPBF
- Part No.:
- LT1375HVCS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375HVCS8#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,040
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Product details
Overview
LT1375HVCS8#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage 500kHz monolithic step-down switching regulator with integrated 1.5A NPN power switch, 2.42V reference voltage, 0.4Ω typical switch on-resistance, and 20µA shutdown current. It operates from 6V to 30V input and delivers up to 1.25A at 5V in fixed-output configuration, targeting battery-powered systems and distributed power rails.
For engineers reviewing the LT1375HVCS8#TRPBF datasheet, LT1375HVCS8#TRPBF pinout, LT1375HVCS8#TRPBF application, or LT1375HVCS8#TRPBF equivalent, key selection criteria include its HV-rated 30V input capability, cycle-by-cycle current limiting, BOOST-pin-driven saturation architecture, thermal shutdown protection, and compatibility with standard 8-lead SOIC layouts.
Technical Context
The LT1375HVCS8#TRPBF implements current-mode control with a fixed 500kHz oscillator and internal slope compensation to prevent subharmonic oscillation across duty cycles up to 93%. Its bipolar NPN switch is driven via an external BOOST capacitor to achieve low 0.4Ω on-resistance and >87% efficiency at full load.
It features dual-threshold shutdown (0.37V for full micropower, 2.38V for UVLO), FB/SENSE pin with foldback current limiting below 1.7V and frequency reduction below 1V, and VC pin serving as error amplifier output and peak-current comparator input - enabling direct loop compensation and current clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 30V - supports wide industrial and automotive battery inputs without external pre-regulation. |
| Switching Frequency | 440–570kHz - enables compact 5–10µH inductors and reduces EMI fundamental energy. |
| Output Current | 1.25A at 5V - limited by 1.5A switch rating and duty-cycle-dependent current derating above 50% DC. |
| Reference Voltage | 2.42V ±1.2% - sets precise output via external divider; used as SENSE threshold in fixed-5V variant. |
| Shutdown Current | 20µA max at VIN ≤ 30V - ensures ultra-low quiescent drain during system sleep modes. |
| Switch On-Resistance | 0.4Ω typ - achieved via BOOST-pin-assisted saturation, reducing conduction loss vs. standard bipolar designs. |
| Thermal Shutdown | Yes - protects device under sustained overload or poor PCB thermal layout. |
Pinout & Package
LT1375HVCS8#TRPBF is housed in an 8-lead plastic SOIC (S8) package with θJA = 120–150°C/W depending on PCB layout. Pin 1 is marked with a dot; exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides elevated gate drive voltage to saturate internal NPN switch; requires external diode + capacitor to VIN. |
| VIN | Power switch collector & bias source | Supplies internal circuitry and powers switch; high di/dt node requiring local bypass and short trace routing. |
| VSW | Switch emitter | Connects to inductor; swings negative during off-time - requires catch diode clamping to GND. |
| BIAS | N/A (not present) | LT1375HVCS8#TRPBF lacks BIAS pin - internal bias derived solely from VIN; differs from LT1376 family. |
| VC | Error amplifier output / current limit comparator input | Used for loop compensation; voltage ranges ~1V (light load) to ~2V (full load); can be clamped to disable regulation. |
| FB/SENSE | Feedback or sense input | In fixed-5V version, functions as SENSE pin tied directly to output; enables foldback current limiting and frequency shift under fault. |
| GND | Analog and power ground reference | Must be connected near load return path to avoid ground bounce; carries narrow EMI spikes from VSW-GND capacitance. |
| SHDN | Shutdown control | Logic-compatible input: <0.37V disables switching; <0.15V forces micropower mode; 2.38V enables UVLO lockout. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Rating | 30V absolute max input - enables direct operation from 24V industrial rails or 2S–3S Li-ion packs. |
| Current-Mode Control | Fast transient response and inherent stability without external compensation components beyond standard RC network on VC. |
| BOOST-Driven Saturation | Reduces switch VCE(sat) to ~0.6V at 1.5A - improves efficiency over conventional bipolar regulators by >12% at mid-load. |
| Foldback Protection | Automatically reduces switch current limit below 1.7V FB and cuts frequency 5:1 below 1V FB - limits power dissipation during short-circuit faults. |
| Thermal + Short-Circuit Protection | Full cycle-by-cycle current limiting plus thermal shutdown - ensures robust operation under sustained overload without external sensing. |
Applications
| Portable Medical Monitor | Battery-Powered Data Logger |
|---|---|
Use Scenario: Compact handheld device powered by 2S Li-ion (6–8.4V) requiring stable 5V rail for microcontroller, sensors, and BLE radio. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V/1.25A with automatic foldback during sensor fault conditions. Use Value: Enables single-stage conversion from battery to 5V with <20µA shutdown current, extending runtime between charges. | Use Scenario: Remote environmental sensor node operating from 3S Li-ion (9–12.6V) with intermittent wake-up cycles and long sleep periods. IC Role / Device Role / Timing Role: High-efficiency 5V supply with UVLO (2.38V SHDN threshold) preventing brownout operation during battery depletion. Use Value: Maintains regulation down to 6V input while consuming only 2.5mA quiescent current - critical for multi-year battery life. |
| Industrial PLC I/O Module | Distributed Telecom Power |
Use Scenario: DIN-rail mounted controller with 24V nominal input (18–32V range) powering isolated 5V logic and analog front-end circuits. IC Role / Device Role / Timing Role: Input-tolerant buck regulator handling line transients and reverse-polarity protection upstream. Use Value: 30V absolute max rating and thermal shutdown allow reliable operation in harsh industrial environments without derating. | Use Scenario: Point-of-load converter in telecom shelf receiving 48V backplane input, stepping down to 5V for FPGA and memory subsystems. IC Role / Device Role / Timing Role: Fixed-output 5V regulator with BOOST-assisted switch driving small 5µH inductor for minimal board area. Use Value: 500kHz switching enables use of low-profile, high-frequency inductors - reducing solution height and improving power density. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376HVCS8#TRPBF | Includes BIAS pin for improved light-load efficiency; otherwise identical electrical specs and pinout. | Preferred when VIN ≫ VOUT (e.g., 24V→5V) and light-load efficiency is critical. | Select LT1376HVCS8#TRPBF if BIAS functionality is needed; otherwise LT1375HVCS8#TRPBF offers same HV performance at lower cost. |
| LM2678SD-5.0/NOPB | 5V fixed output, 5A rating, 260kHz switching, SO-8 package; no BOOST pin or foldback protection. | Suitable for higher-current, lower-frequency designs where size and EMI are less constrained. | Choose LM2678SD-5.0/NOPB only if ≥5A output and relaxed efficiency requirements justify larger magnetics and reduced switching noise sensitivity. |
Compared with LT1376HVCS8#TRPBF, the LT1375HVCS8#TRPBF omits the BIAS pin but retains identical HV rating, current capability, and protection features - making it optimal for cost-sensitive, VIN-to-VOUT ratios ≤ 4:1. Versus LM2678SD-5.0/NOPB, it trades raw current capacity for superior light-load efficiency, smaller passive components, and robust fault management.
Availability
LT1375HVCS8#TRPBF is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and distributed telecom power systems requiring stable component supply with guaranteed long-term availability.
Supply support for LT1375HVCS8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1375HV series belongs to Linear's legacy monolithic switching regulator product line, designed specifically for compact, high-efficiency DC/DC conversion in space-constrained and battery-sensitive applications.
FAQ
What is the maximum input voltage rating for LT1375HVCS8#TRPBF?
The LT1375HVCS8#TRPBF has an absolute maximum input voltage rating of 30V, with recommended operating range from 6V to 25V. This HV rating distinguishes it from standard LT1375 variants (25V max) and enables direct use with 24V industrial buses or 3S Li-ion batteries. Exceeding 30V risks permanent damage per Absolute Maximum Ratings table.
Does LT1375HVCS8#TRPBF include a BIAS pin for efficiency optimization?
No, LT1375HVCS8#TRPBF does not include a BIAS pin. That feature is exclusive to the LT1376HV series. The LT1375HVCS8#TRPBF derives all internal bias current from VIN, resulting in slightly higher light-load quiescent current than LT1376HV variants when VIN significantly exceeds VOUT. This simplifies design for moderate input-output differentials.
How does the FB/SENSE pin function in LT1375HVCS8#TRPBF?
In the LT1375HVCS8#TRPBF fixed-5V variant, the FB/SENSE pin serves as a direct output voltage sense node - connected to the 5V rail - rather than a feedback divider input. It enables two critical protections: current limit foldback when voltage drops below 1.7V, and 5:1 frequency reduction when voltage falls below 1V, both enhancing fault resilience during short-circuit events.
What thermal characteristics apply to LT1375HVCS8#TRPBF in SOIC-8 package?
The LT1375HVCS8#TRPBF in 8-lead SOIC (S8) package has a junction-to-ambient thermal resistance (θJA) ranging from 120°C/W to 150°C/W, highly dependent on PCB copper area and layout. With fused corner pins connected to ground plane, θJA improves to 100°C/W. Thermal shutdown activates at ~165°C junction temperature, protecting against sustained overload or inadequate heatsinking.
Can LT1375HVCS8#TRPBF be synchronized to an external clock?
No, LT1375HVCS8#TRPBF does not support external synchronization. The SYNC pin is present only on the LT1375 (non-HV) and LT1376 families. LT1375HVCS8#TRPBF uses a fixed internal 500kHz oscillator with ±14% variation over temperature and line. For synchronizable alternatives, consider LT1376HVCS8#TRPBF, which retains the same HV rating and adds SYNC functionality.
LT1375HVCS8#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):
- 30V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 25.8V
- Current - Output:
- 1.5A (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
LT1375HVCS8#TRPBF FAQ
1.How can I place an order for LT1375HVCS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375HVCS8#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 LT1375HVCS8#TRPBF reliable?
The price and inventory of LT1375HVCS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375HVCS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1375HVCS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375HVCS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375HVCS8#TRPBF?
LT1375HVCS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375HVCS8#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 LT1375HVCS8#TRPBF?
For technical support, including LT1375HVCS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375HVCS8#TRPBF requirements.
6.How does Aetrix verify that LT1375HVCS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1375HVCS8#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 LT1375HVCS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1375HVCS8#TRPBF?
All LT1375HVCS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375HVCS8#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 LT1375HVCS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1375HVCS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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