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Analog Devices Inc. LT1375HVCS8#PBF
- Part No.:
- LT1375HVCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375HVCS8#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:322
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Product details
Overview
LT1375HVCS8#PBF from Analog Devices (formerly Linear Technology) is a high-voltage 500kHz monolithic buck 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 output in fixed-mode configuration, targeting battery-powered systems and distributed power rails.
For engineers reviewing the LT1375HVCS8#PBF datasheet, LT1375HVCS8#PBF pinout, LT1375HVCS8#PBF application, or LT1375HVCS8#PBF equivalent, key selection considerations include its HV-rated 30V input capability, fused-lead SO-8 thermal performance (θJA = 120–150°C/W), cycle-by-cycle current limiting, and compatibility with external synchronization only on LT1375 variants - not applicable to this HV fixed-output part.
Technical Context
The LT1375HVCS8#PBF implements current-mode control with an internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the VC pin. Its bipolar NPN switch uses BOOST-pin-driven saturation for low conduction loss, enabling >87% efficiency at 1A load with 5V output and 10V input.
It features dual-threshold shutdown (0.37V full shutdown, 2.38V UVLO), feedback-based frequency foldback below 1V FB voltage, and current-limit foldback below 1.7V FB voltage - all designed to limit power dissipation during short-circuit or startup faults without external intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 30V - supports wide industrial/battery inputs; absolute max 30V per HV rating. |
| Output Voltage | Fixed 5V ±1.2% - internally trimmed sense divider eliminates external resistor network. |
| Switch Current Limit | 1.5A at ≤50% duty cycle - derates to 1.35A at 80% DC; enables safe operation up to ~1.25A continuous load with 10µH inductor. |
| Switch On-Resistance | 0.4Ω typical - achieved via BOOST-pin-assisted saturation; reduces conduction loss vs standard bipolar designs. |
| Shutdown Current | 20µA typical - ensures ultra-low quiescent drain in battery standby mode. |
| Switching Frequency | 500kHz ±10% - enables compact 5–10µH inductors and low-ESR ceramic output capacitors. |
| Reference Voltage | 2.42V ±1.2% - sets accuracy of internal 5V regulation; stable over –40°C to 125°C junction temperature. |
Pinout & Package
LT1375HVCS8#PBF is housed in an 8-lead plastic SO package (S8) with fused corner pins for enhanced thermal performance (θJA = 120–150°C/W depending on PCB layout). The package is RoHS-compliant and lead-free (#PBF suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Supplies elevated voltage to saturate internal NPN switch; must be connected to VIN via diode + capacitor for <0.4Ω RON. |
| VIN | Main power input | Collector of internal NPN switch; powers bias circuitry; requires local 100µF solid tantalum bypass. |
| VSW | Switch emitter node | Connects to inductor; swings negative during off-time; clamped by external catch diode (e.g., 1N5818). |
| BIAS | Not connected (NC) | Unused on LT1375 series; LT1376 variant uses this pin to improve light-load efficiency - absent here. |
| VC | Error amplifier output / current limit threshold | Controls peak switch current; used for loop compensation; clamp range 0.9V–2.1V. |
| FB/SENSE | Feedback / output voltage sense | Internally connected to 5V output; monitors regulation; triggers foldback below 1.7V (current) and 1V (frequency). |
| GND | Power and signal reference | Must tie directly to load ground plane; critical for load regulation and EMI control due to VSW-GND coupling spikes. |
| SHDN | Shutdown control | Logic-level input: <0.37V disables switching and reduces IQ to 20µA; >2.38V enables UVLO protection. |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Rating | 30V absolute maximum input - extends usable range beyond standard 25V buck regulators for 24V industrial or automotive-derived supplies. |
| Integrated Current-Mode Control | Eliminates need for external slope compensation; provides inherent stability and fast transient response without complex loop design. |
| Foldback Protection | Automatically reduces switch current limit and switching frequency during output short-circuit - limits IC and external component power dissipation. |
| Low Quiescent Supply Current | 2.5mA effective operating current - enables high efficiency across wide load range, especially critical in portable applications. |
| Thermally Optimized SO-8 | Fused corner pins reduce thermal resistance - allows higher continuous power delivery than standard SO-8 packages under identical PCB conditions. |
Applications
| Battery-Powered Portable Systems | Distributed Power Architecture |
|---|---|
Use Scenario: Regulating 5V rail from 9–24V Li-ion or lead-acid battery packs in handheld test equipment or ruggedized field instruments. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC step-down converter delivering regulated 5V at up to 1.25A with minimal external components. Use Value: Enables compact, thermally robust design using only 5µH inductor and 100µF solid tantalum capacitor - no external MOSFET or controller required. |
Use Scenario: Local point-of-load conversion in telecom or industrial backplanes where 24V or 48V intermediate bus supplies multiple 5V subsystems. IC Role / Device Role / Timing Role: Standalone buck regulator providing isolated 5V domain with built-in fault management and UVLO sequencing. Use Value: Delivers reliable start-up above 6V input while maintaining tight 5V regulation (±1.2%) across temperature and line variations - simplifies system-level power sequencing. |
| Industrial Sensor Node Power | Legacy System Voltage Translation |
Use Scenario: Powering microcontroller, ADC, and analog front-end in wired industrial sensors operating from unregulated 12–28V supply rails. IC Role / Device Role / Timing Role: High-efficiency, fault-tolerant 5V source with automatic short-circuit recovery and thermal shutdown. Use Value: Survives sustained overloads via foldback protection - avoids latch-up or damage during sensor cable faults or ESD events. |
Use Scenario: Replacing obsolete 7805 linear regulators in legacy embedded controllers requiring 5V from 12–24V inputs. IC Role / Device Role / Timing Role: Drop-in efficiency upgrade offering >85% efficiency vs <40% for linear regulators at 500mA load. Use Value: Eliminates heatsink requirement and reduces board temperature rise by >30°C - extends lifetime of surrounding electrolytic capacitors and connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#PBF | 4MHz synchronous buck, 3A output, 2.7–5.5V input - requires lower VIN and offers higher integration but lacks HV input capability. | Best suited for low-input, high-density applications (e.g., FPGA core rails); not viable for 24V input systems. | Select LTC3605EDE#PBF only if input is ≤5.5V and higher switching frequency is needed for ultra-small magnetics. |
| TPS54202DRCT | 2A synchronous buck, 4.5–28V input, 500kHz, integrated FETs - wider VIN range than standard LT1375 but narrower than HV version; no BOOST pin. | Offers better light-load efficiency via Eco-mode; lacks foldback protection and UVLO precision of LT1375HVCS8#PBF. | Choose TPS54202DRCT when BOM cost and thermal footprint are prioritized over fault robustness and 30V margin. |
Compared with LTC3605EDE#PBF and TPS54202DRCT, LT1375HVCS8#PBF uniquely combines 30V absolute input rating, bipolar-switch saturation efficiency, and dual-threshold shutdown - making it optimal for industrial battery and legacy 24V systems where reliability under fault and wide input tolerance are non-negotiable.
Availability
LT1375HVCS8#PBF is available at Aetrix Electronics and suitable for battery-powered portable systems, distributed power architecture, industrial sensor node power, and legacy system voltage translation requiring stable component supply and long-term industrial lifecycle support.
Supply support for LT1375HVCS8#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 technical and manufacturing continuity for the LT® product family, known for high-performance analog and power management ICs.
The LT1375HVCS8#PBF belongs to Linear's monolithic current-mode buck regulator product line, engineered specifically for rugged, high-input-voltage DC/DC conversion in space-constrained industrial and portable applications.
FAQ
What is the maximum input voltage rating for LT1375HVCS8#PBF?
The LT1375HVCS8#PBF has an absolute maximum input voltage rating of 30V, confirmed in the Absolute Maximum Ratings table. This distinguishes it from the standard LT1375 (25V max) and enables use in 24V industrial or automotive-derived systems where transient spikes may exceed 25V. Operation above 25V is fully specified and characterized across temperature.
Does LT1375HVCS8#PBF support external synchronization?
No, LT1375HVCS8#PBF does not support external synchronization. The SYNC pin is present only on the LT1375 (non-HV, non-5V-fixed) variants. LT1375HVCS8#PBF is a fixed 5V output part with internal 500kHz oscillator and no SYNC functionality - as verified in the Pin Functions section and PACKAGE/ORDER INFORMATION table.
What is the purpose of the BOOST pin on LT1375HVCS8#PBF?
The BOOST pin on LT1375HVCS8#PBF supplies an elevated gate drive voltage to saturate the internal NPN power switch, reducing its on-resistance to 0.4Ω typical. It must be connected to VIN through a Schottky diode and capacitor (e.g., 10nF); without BOOST, switch loss increases significantly and efficiency drops below 75% - as documented in the PIN FUNCTIONS and TYPICAL APPLICATIO sections.
Can LT1375HVCS8#PBF operate with input voltage below 6V?
No, LT1375HVCS8#PBF has a minimum guaranteed input voltage of 6V, stated in the Applications Information section and confirmed by the "Minimum Input Voltage" specification (5.5V typical, 6.0V guaranteed). Below 6V, internal bias lines lose regulation, causing reference voltage drift and oscillator frequency instability - making reliable 5V regulation impossible.
Is the BIAS pin functional on LT1375HVCS8#PBF?
No, the BIAS pin is not functional on LT1375HVCS8#PBF. It is a no-connect (NC) terminal, as confirmed in the S8 PACKAGE top view diagram and Pin Functions description. The BIAS feature exists only on LT1376 variants to improve light-load efficiency - LT1375HVCS8#PBF uses VIN to power all internal circuitry.
LT1375HVCS8#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1375HVCS8#PBF FAQ
1.How can I place an order for LT1375HVCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375HVCS8#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 LT1375HVCS8#PBF reliable?
The price and inventory of LT1375HVCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375HVCS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1375HVCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375HVCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375HVCS8#PBF?
LT1375HVCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375HVCS8#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 LT1375HVCS8#PBF?
For technical support, including LT1375HVCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375HVCS8#PBF requirements.
6.How does Aetrix verify that LT1375HVCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1375HVCS8#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 LT1375HVCS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1375HVCS8#PBF?
All LT1375HVCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375HVCS8#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 LT1375HVCS8#PBF part is unused and in its original packaging.
Return procedure for LT1375HVCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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