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Analog Devices Inc. LT1375HVIS8#TRPBF
- Part No.:
- LT1375HVIS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375HVIS8#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,377
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Product details
Overview
LT1375HVIS8#TRPBF 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 with 0.4Ω typical switch on-resistance, 2.5mA quiescent current, and cycle-by-cycle current limiting - designed for battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1375HVIS8#TRPBF datasheet, LT1375HVIS8#TRPBF pinout, LT1375HVIS8#TRPBF application, or LT1375HVIS8#TRPBF equivalent, this page provides verified technical context, package-validated pin functions, real-world load-current limits across input voltage ranges, thermal resistance data for SO-8 packaging, and confirmed alternatives with documented functional and application-level differences.
Technical Context
The LT1375HVIS8#TRPBF implements constant-frequency current-mode control using 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 inductor current on a cycle-by-cycle basis. Its saturating bipolar NPN switch architecture-enabled by external BOOST capacitor drive-achieves 0.4Ω on-resistance and >87% efficiency at 1A load.
This HV variant supports 6V–30V input range and includes undervoltage lockout (2.38V UVLO threshold), thermal shutdown, and 20µA shutdown current. Unlike the LT1376, it lacks BIAS and SYNC pins, confirming its role as a simplified, fixed-output buck controller optimized for robustness over programmability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (guaranteed over –40°C to 125°C junction) |
| Input Voltage Range | 6V to 30V - enables direct operation from 24V industrial rails or multi-cell Li-ion batteries |
| Switch Current Limit | 1.5A at ≤50% duty cycle; derates to 1.35A at 80% duty cycle - constrains max continuous load to 1.25A at VIN=10V, L=10µH |
| Switching Frequency | 440–570kHz - fixed nominal 500kHz with ±6% tolerance over temperature and line |
| Quiescent Supply Current | 2.5mA typical - enables low-power standby in portable equipment without external biasing |
| Shutdown Current | 20µA maximum - reduces system-level leakage during sleep modes |
| Thermal Resistance θJA | 120–150°C/W depending on PCB layout - requires thermal pad or ground plane for >0.8A continuous operation |
Pinout & Package
LT1375HVIS8#TRPBF uses an 8-lead plastic SOIC (S8) package with exposed thermal pad (not electrically connected). Pin 1 is marked with dot; pin numbering follows standard SO-8 convention. GND pins (pins 3, 6, 7) must be tied together and connected to a low-impedance ground plane to ensure stable regulation and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Boost capacitor drive node | Supplies >VIN voltage to saturate internal NPN switch; requires 10nF ceramic + Schottky diode (e.g., 1N5817) to VIN |
| 2: VIN | Main power input | Accepts 6–30V; powers internal circuitry and switch collector; bypass with ≥10µF solid tantalum near pin |
| 3: VSW | Switch emitter output | Drives inductor; swings negative during off-time - clamped by external catch diode (e.g., 1N5818) |
| 4: BIAS | Not connected (NC) | Unused in LT1375 family; left floating or grounded - no internal connection |
| 5: VC | Error amplifier output / current limit setpoint | Controls peak switch current; used for loop compensation (typical 1nF + 10kΩ from VC to GND) |
| 6: FB/SENSE | Output voltage sense input | Internally connected to 5V output; monitors regulation and triggers foldback below 1.7V (current limit) and 1V (frequency shift) |
| 7: GND | Analog and power ground reference | Reference for feedback and error amplifier; must tie all GND pins (3,6,7) to same low-impedance plane |
| 8: SHDN | Enable/shutdown control | Logic-high (>2.38V) enables regulation; logic-low (<0.4V) disables switch and reduces IQ to 20µA |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input rating | 30V absolute max input - supports 24V industrial, automotive, and telecom power rails without external pre-regulation |
| Saturating bipolar switch | 0.4Ω typical RON - achieves FET-like conduction loss with smaller die area than MOSFET-based controllers |
| Integrated protection | Cycle-by-cycle current limiting + thermal shutdown - eliminates need for external fault-handling circuitry |
| Undervoltage lockout (UVLO) | 2.38V precise start-up threshold - prevents erratic operation during brown-out or battery sag conditions |
| Low-noise current-mode topology | Fast transient response with inherent stability - simplifies compensation design vs. voltage-mode converters |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Compact handheld vital-signs analyzer powered by two 3.7V Li-ion cells in series (7.4V–8.4V), requiring clean 5V rail for microcontroller, ADC, and display backlight. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated power to mixed-signal subsystem; operates at 500kHz to minimize inductor size in space-constrained enclosure. Use Value: 0.4Ω switch RON and 2.5mA quiescent current extend battery life beyond 8 hours; UVLO prevents reset during cell discharge below 6.5V. |
Use Scenario: DIN-rail mounted sensor interface module receiving 24V DC from factory power supply, powering isolated RS-485 transceivers and analog front-end. IC Role / Device Role / Timing Role: Non-isolated 5V local supply for digital logic; withstands 30V transients per IEC 61000-4-5 Level 3 surge testing. Use Value: 30V input rating eliminates need for TVS + LDO pre-regulator; thermal shutdown protects against ambient temperatures up to 70°C inside sealed enclosure. |
| Battery Charger Auxiliary Rail | Test Equipment Power Sequencer |
Use Scenario: Multi-chemistry Li-ion/NiMH charger with microcontroller supervising charge profiles, requiring stable 5V for MCU, USB interface, and status LEDs. IC Role / Device Role / Timing Role: Secondary regulated supply derived from main 12–19V charger bus; handles dynamic load steps during LED pulsing and USB enumeration. Use Value: Current-mode control ensures <10µs recovery from 100mA–1A load steps; foldback current limiting prevents thermal runaway during short-circuit test mode. |
Use Scenario: Automated test fixture sequencing power to DUTs with strict ramp timing, where 5V rail must enable only after 12V and –5V rails stabilize. IC Role / Device Role / Timing Role: Controlled 5V source triggered by system supervisor IC via SHDN pin; synchronized start-up avoids cross-rail contention. Use Value: Precise 0.4V shutdown threshold allows clean, repeatable enable/disable timing; 20µA shutdown current minimizes standby drain on backup supercapacitor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4MHz synchronous buck, 3A output, 2.5–5.5V input - requires external MOSFETs; no BOOST pin needed | Higher frequency enables <1µH inductors but unsuitable for >12V input; lacks 30V HV rating | Select when board space is critical and input is ≤5.5V; avoid for 24V industrial use. |
| TPS54202DRCT | 2A synchronous buck, 4.5–28V input, 500kHz fixed freq - integrated high-side/low-side FETs; no external BOOST required | Lower RDS(on) improves efficiency above 0.5A but lacks UVLO precision and thermal shutdown margin | Prefer for cost-sensitive consumer designs with <28V input; verify thermal performance at 70°C ambient. |
Compared with LT1375HVIS8#TRPBF, LTC3605EDE#TRPBF offers higher integration and frequency but sacrifices HV capability and ruggedness, while TPS54202DRCT provides better light-load efficiency and simpler layout yet lacks the precise 2.38V UVLO and guaranteed 30V survival - making LT1375HVIS8#TRPBF the optimal choice for harsh, wide-input industrial environments.
Availability
LT1375HVIS8#TRPBF is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and battery-powered test equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1375HVIS8#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, including long-term manufacturing commitment and technical documentation archives.
The LT1375 family was designed as a rugged, fixed-output buck controller targeting battery-powered and industrial systems where reliability under voltage transients and thermal stress outweighs programmability needs.
FAQ
What is the maximum continuous output current of the LT1375HVIS8#TRPBF at 24V input?
The LT1375HVIS8#TRPBF delivers up to 1.25A at 5V output when VIN = 10V and L = 10µH. At 24V input, duty cycle drops to ~21%, allowing full 1.5A switch current, but inductor ripple increases - limiting practical continuous output to ~1.1A with proper thermal management. Derating is required above 70°C ambient.
Does the LT1375HVIS8#TRPBF require an external BOOST capacitor, and what value is recommended?
Yes, the LT1375HVIS8#TRPBF requires an external BOOST capacitor to saturate its internal NPN switch. A 10nF X7R ceramic capacitor placed between BOOST and VIN, with a Schottky diode (e.g., 1N5817) anode to VIN and cathode to BOOST, is specified in the datasheet. This configuration ensures <0.4Ω switch RON across temperature and load.
Can the LT1375HVIS8#TRPBF be used with a 3.3V output instead of 5V?
No - the LT1375HVIS8#TRPBF is a fixed 5V output device. The FB/SENSE pin is internally connected to the 5V regulator output and lacks external feedback divider capability. For adjustable or 3.3V outputs, use LT1376HVCS8#TRPBF (adjustable) or LT1376IS8-3.3#TRPBF (fixed 3.3V).
What is the purpose of the NC pin (Pin 4) on the LT1375HVIS8#TRPBF?
Pin 4 on the LT1375HVIS8#TRPBF is designated BIAS but is not connected internally - it is a true no-connect (NC) pin. It must be left floating or tied to GND; connecting it to any voltage risks undefined behavior. This distinguishes LT1375 from LT1376, which uses this pin for efficiency-boosting bias current routing.
How does the LT1375HVIS8#TRPBF handle short-circuit conditions?
The LT1375HVIS8#TRPBF employs dual-foldback protection: when FB/SENSE voltage falls below 1.7V, peak switch current is reduced; below 1V, switching frequency drops ~5:1. This limits power dissipation in the IC, catch diode, and inductor during sustained shorts - enabling safe operation without external current-limiting circuitry.
LT1375HVIS8#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1375HVIS8#TRPBF FAQ
1.How can I place an order for LT1375HVIS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375HVIS8#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 LT1375HVIS8#TRPBF reliable?
The price and inventory of LT1375HVIS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375HVIS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1375HVIS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375HVIS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375HVIS8#TRPBF?
LT1375HVIS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375HVIS8#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 LT1375HVIS8#TRPBF?
For technical support, including LT1375HVIS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375HVIS8#TRPBF requirements.
6.How does Aetrix verify that LT1375HVIS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1375HVIS8#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 LT1375HVIS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1375HVIS8#TRPBF?
All LT1375HVIS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375HVIS8#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 LT1375HVIS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1375HVIS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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