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Analog Devices Inc. LT1375HVIS8#PBF
- Part No.:
- LT1375HVIS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375HVIS8#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,516
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Product details
Overview
LT1375HVIS8#PBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic step-down switching regulator with integrated 1.5A NPN power switch, fixed 5V output, and high-voltage 30V input rating. It delivers up to 1.25A at 5V from 6V–25V input, features cycle-by-cycle current limiting, 0.4Ω switch on-resistance, and 20µA shutdown current. It is used in battery-powered systems requiring compact, efficient DC/DC conversion with thermal robustness.
For engineers reviewing the LT1375HVIS8#PBF datasheet, LT1375HVIS8#PBF pinout, LT1375HVIS8#PBF application, or LT1375HVIS8#PBF equivalent, key selection criteria include its HV-rated 30V absolute max input, fixed 5V output configuration, SO-8 package thermal performance (θJA = 120–150°C/W), and compatibility with standard surface-mount inductors as small as 5µH.
Technical Context
The LT1375HVIS8#PBF implements constant-frequency current-mode control with an internal 500kHz oscillator and dual-loop regulation: the error amplifier sets peak switch current via the VC pin, while the current-sense amplifier monitors switch emitter voltage for cycle-by-cycle limiting. Its saturating bipolar NPN switch-driven by the BOOST pin-achieves low conduction loss (0.4Ω typical) without requiring external gate drive circuitry.
It integrates undervoltage lockout (2.38V SHDN threshold), thermal shutdown, and frequency foldback below 1V FB voltage to limit power dissipation during short-circuit conditions. The fixed 5V output version uses internal feedback resistors (SENSE pin), eliminating external divider components and reducing BOM count.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (guaranteed over temperature and line) |
| Switch Current Limit | 1.5A at ≤50% duty cycle; reduces to 1.35A at 80% duty cycle for slope compensation |
| Switch On Resistance | 0.4Ω typical (enables >87% efficiency at 1A, VIN=10V, VOUT=5V) |
| Shutdown Current | 20µA typical (reduces system standby power in portable applications) |
| Operating Input Range | 6V to 25V (absolute max 30V - supports 24V industrial rails and wide-battery inputs) |
| Switching Frequency | 500kHz ±10% (enables use of small 5–10µH inductors and low-ESR ceramic output caps) |
| Junction Temp Range | –40°C to +125°C (qualified for extended industrial environments) |
Pinout & Package
LT1375HVIS8#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad thermal enhancement. Pin spacing is 1.27mm, body size 4.9mm × 6.0mm, and recommended PCB layout includes direct GND plane connection under the exposed pad for optimal thermal resistance (θJA = 120–150°C/W depending on copper area).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides ~VIN+5V gate drive to saturate internal NPN switch; requires external 10nF–100nF capacitor to VIN |
| VIN | Input power collector | Supplies internal circuitry and powers switch collector; must be bypassed with low-ESR capacitor near pin |
| VSW | Switch emitter output | Connects to inductor; swings negative during off-time - requires catch diode clamping to GND |
| BIAS | Not connected (NC) on LT1375 series | Unused pin - left floating or tied to GND per layout guidelines; distinct from LT1376's BIAS functionality |
| VC | Error amplifier output / current limit control | Controls peak switch current; used for loop compensation (capacitor to GND) or external override |
| FB/SENSE | Feedback / output voltage sense | Fixed 5V version uses internal divider; SENSE pin connects directly to regulated 5V output for accuracy |
| GND | Power and signal reference | Must tie to low-impedance ground plane; critical for load regulation and EMI control due to fast GND current spikes |
| SHDN | Enable/disable control | Logic-compatible input: <0.4V = full shutdown (20µA), >2.38V = UVLO disable, >2.5V = active operation |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Rating | 30V absolute maximum input enables use in 24V industrial, automotive accessory, and wide-range battery systems |
| Integrated Current Limit Protection | Cycle-by-cycle sensing prevents switch failure during overload or short-circuit without external sensing resistors |
| Thermal Shutdown with Hysteresis | Automatic recovery after cooling avoids latch-up in thermally constrained enclosures or high ambient conditions |
| Frequency Foldback Under Fault | Reduces switching frequency 5:1 when SENSE voltage drops below 1V - limits power dissipation in IC and external diode |
| Low Quiescent Supply Current | 2.5mA typical operating current extends runtime in always-on battery-powered devices such as IoT sensors |
Applications
| Battery-Powered Portable Equipment | Industrial 24V Distributed Power |
|---|---|
|
Use Scenario: Compact handheld test instrument powered by 3-cell Li-ion (9–12.6V) requiring stable 5V rail for microcontroller and analog front-end. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering regulated 5V at up to 1.25A with minimal external components. Use Value: Enables single-layer PCB layout using 5µH inductor and ceramic output cap; 20µA shutdown current preserves battery life during sleep mode. |
Use Scenario: DIN-rail mounted PLC I/O module receiving 24V DC input and needing clean 5V for logic and communication interfaces. IC Role / Device Role / Timing Role: Input-stage DC/DC converter handling 6–25V input range with built-in UVLO and thermal protection. Use Value: Withstands 30V transients per IEC 61000-4-4; fixed 5V output eliminates resistor tolerance errors and improves long-term stability. |
| USB-C Powered Peripherals | Medical Point-of-Care Devices |
|
Use Scenario: USB-C powered ultrasound probe requiring 5V at 1A from variable 5–20V PD source negotiation. IC Role / Device Role / Timing Role: Buck regulator supporting wide-input operation with fast transient response for pulsed imaging loads. Use Value: 500kHz switching allows small magnetics; current-mode control ensures stable output during rapid load steps from 10mA to 1A. |
Use Scenario: Portable blood glucose meter with coin-cell backup and main alkaline battery, needing reliable 5V supply across aging voltage profiles. IC Role / Device Role / Timing Role: Main power regulator with precise 5V output and low-noise operation for ADC reference and sensor biasing. Use Value: Fixed internal feedback ensures ±1.2% output accuracy over –40°C to +85°C; 0.4Ω switch minimizes dropout at end-of-life battery voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376HVIS8#PBF | Same pinout and specs, but includes BIAS pin for improved light-load efficiency at high VIN/VOUT ratios | Preferred when VIN ≥ 15V and light-load efficiency is critical (e.g., always-on monitoring nodes) | Select LT1376HVIS8#PBF only if BIAS functionality is required; otherwise LT1375HVIS8#PBF offers identical 5V regulation with simpler layout |
| LM2678SD-5.0/NOPB | 5V fixed, 1A rated, 63kHz switching - larger inductor required; no frequency foldback or BOOST pin | Suitable for cost-sensitive, low-EMI applications where size and efficiency are secondary | Choose LM2678SD-5.0/NOPB only if 500kHz noise is unacceptable and board space permits larger 47µH inductor |
Compared with LT1376HVIS8#PBF, LT1375HVIS8#PBF omits the BIAS pin - simplifying design and reducing component count where high VIN efficiency isn't needed. Versus LM2678SD-5.0/NOPB, it delivers 25% higher output current, 8× higher switching frequency, and integrated fault protection - enabling smaller, more robust designs.
Availability
LT1375HVIS8#PBF is available at Aetrix Electronics and suitable for battery-powered portable equipment, industrial 24V distributed power systems, and medical point-of-care devices requiring stable component supply with guaranteed long-term availability.
Supply support for LT1375HVIS8#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 support for the LT® product family, known for high-performance analog and power management ICs targeting precision, reliability, and rugged operation.
The LT1375 belongs to Linear's monolithic current-mode buck regulator product line, designed specifically for compact, high-efficiency DC/DC conversion in space-constrained and thermally demanding applications - especially where wide-input voltage and fault resilience are required.
FAQ
What is the maximum continuous output current of the LT1375HVIS8#PBF?
The LT1375HVIS8#PBF delivers up to 1.25A continuous output current at 5V when operating from 10V input with a 10µH inductor. At higher input voltages (e.g., 24V), maximum load current decreases due to increased inductor ripple and duty-cycle-dependent switch current derating - down to ~1.0A at VIN = 24V, L = 10µH. Always verify peak switch current using the formula ISW(PEAK) = IOUT + (VOUT(VIN−VOUT))/(2LfVIN) to ensure safe operation within the 1.5A limit.
Does the LT1375HVIS8#PBF require an external feedback resistor network?
No - the LT1375HVIS8#PBF is the fixed 5V output variant and uses internal feedback resistors. Its FB/SENSE pin functions as a SENSE input and must be connected directly to the regulated 5V output node. External resistors are unnecessary and would degrade accuracy; adding them may cause regulation failure or instability. This differs from adjustable versions like LT1375IS8, which require external R1/R2 dividers.
Can the LT1375HVIS8#PBF be synchronized to an external clock?
No - synchronization capability is exclusive to the LT1375 (non-HV) and LT1376 families. The LT1375HVIS8#PBF lacks a SYNC pin and operates at a fixed 500kHz internal frequency only. If external synchronization is required, consider the LT1375IS8 (non-HV, 8-pin SO) or LT1376HVIS8#PBF (HV-rated with SYNC pin in 16-pin SO package), both of which support 580–900kHz sync ranges.
What is the purpose of the BOOST pin on the LT1375HVIS8#PBF?
The BOOST pin on the LT1375HVIS8#PBF provides elevated drive voltage (~VIN + 5V) to fully saturate the internal NPN power switch, reducing conduction loss to 0.4Ω typical. It requires an external boost capacitor (e.g., 10nF ceramic) connected between BOOST and VIN. Without proper boosting, switch saturation fails, increasing dropout and reducing efficiency - particularly critical at low input voltages near the 6V minimum.
How does the LT1375HVIS8#PBF handle short-circuit conditions?
The LT1375HVIS8#PBF employs dual fault protection: cycle-by-cycle current limiting caps peak switch current at 1.5A, while frequency foldback reduces switching frequency up to 5:1 when the SENSE pin voltage falls below 1V. This combination limits power dissipation in both the IC and external components during sustained shorts. Thermal shutdown activates if junction temperature exceeds safe limits, and automatic recovery occurs after cooling.
LT1375HVIS8#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):
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1375HVIS8#PBF FAQ
1.How can I place an order for LT1375HVIS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375HVIS8#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 LT1375HVIS8#PBF reliable?
The price and inventory of LT1375HVIS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375HVIS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1375HVIS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375HVIS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375HVIS8#PBF?
LT1375HVIS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375HVIS8#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 LT1375HVIS8#PBF?
For technical support, including LT1375HVIS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375HVIS8#PBF requirements.
6.How does Aetrix verify that LT1375HVIS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1375HVIS8#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 LT1375HVIS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1375HVIS8#PBF?
All LT1375HVIS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375HVIS8#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 LT1375HVIS8#PBF part is unused and in its original packaging.
Return procedure for LT1375HVIS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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