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Analog Devices Inc. LT1376HVCS#TRPBF
- Part No.:
- LT1376HVCS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376HVCS#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,472
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Product details
Overview
LT1376HVCS#TRPBF from Analog Devices (formerly Linear Technology) is a high-voltage 500kHz monolithic buck switching regulator with integrated 1.5A NPN power switch, fixed 5V output, and 6V–25V input range. It uses current-mode control for fast transient response, features 0.4Ω switch on-resistance, 2.5mA quiescent current, and 20µA shutdown current. It is designed for compact, efficient DC/DC conversion in battery-powered industrial systems.
For engineers reviewing the LT1376HVCS#TRPBF datasheet, LT1376HVCS#TRPBF pinout, LT1376HVCS#TRPBF application, or LT1376HVCS#TRPBF equivalent, key selection criteria include its HV-rated 30V absolute max input, BOOST-pin-driven saturation architecture, thermal performance in SO-8 package, and compatibility with low-ESR tantalum output capacitors.
Technical Context
The LT1376HVCS#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and cycle-by-cycle peak current limiting. Its bipolar NPN switch is driven via an external BOOST capacitor to achieve saturated operation-reducing conduction loss to ~0.4Ω and enabling >87% efficiency at full load.
It integrates a 2.42V reference, error amplifier with 2000 µMho transconductance, and dual-threshold shutdown (0.37V active shutdown, 2.38V UVLO). The BIAS pin (present only on LT1376 variants) allows output-derived biasing to improve light-load efficiency when VIN ≫ VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 25V - supports wide industrial input rails; absolute max 30V per HV rating. |
| Output Voltage | Fixed 5V ±1.2% - internally trimmed sense threshold eliminates external feedback resistors. |
| Switch Current Limit | 1.5A at ≤50% duty cycle - defines maximum continuous output current with appropriate inductor sizing. |
| Switch On Resistance | 0.4Ω typical - achieved via BOOST-pin-assisted saturation, reducing conduction loss vs. standard bipolar designs. |
| Quiescent Supply Current | 2.5mA typical - enables high efficiency across wide load range; drops to 20µA in shutdown. |
| Switching Frequency | 500kHz ±10% - enables use of small 5–10µH inductors and reduces output ripple frequency. |
| Thermal Resistance θJA | 120–150°C/W - depends on PCB layout; fused-corner SO-8 package improves heat dissipation over standard SO-8. |
Pinout & Package
LT1376HVCS#TRPBF is housed in an 8-lead plastic SO (S8) package with fused corner pins connected to ground for enhanced thermal performance. Pin 1 is VC, Pin 2 is FB/SENSE, Pin 3 is GND, Pin 4 is SHDN, Pin 5 is BOOST, Pin 6 is VIN, Pin 7 is VSW, and Pin 8 is BIAS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC | Error amplifier output / current limit control | Drives internal current comparator; voltage ~1V (light load) to ~2V (full load); can be clamped to disable switching. |
| FB/SENSE | Output voltage sensing (fixed 5V mode) | Internally connected to 5V output; monitors regulation; triggers foldback protection below 1.7V. |
| GND | Power and signal reference | Must be tied directly to low-impedance ground plane; serves as return path for switch current and error amp reference. |
| SHDN | Enable/disable control | Logic-low (<0.6V) disables switching; 2.38V threshold provides accurate undervoltage lockout (UVLO). |
| BOOST | Switch drive voltage boost | Accepts external capacitor+diode network to generate VIN+5V drive - essential for NPN saturation and low RON. |
| VIN | Main power input | Supplies internal circuitry and collector of on-chip NPN switch; requires local 100µF solid tantalum bypass. |
| VSW | Switch emitter node | Connects to inductor; swings negative during off-time - requires external catch diode (e.g., 1N5818) clamping. |
| BIAS | Efficiency-optimized bias supply | When tied to regulated 5V output, shifts internal bias current from VIN to VOUT - improves light-load efficiency by >10% at VIN=20V. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage input rating | 30V absolute maximum input (HV variant) - supports 24V industrial rails with margin. |
| Integrated BOOST-drive architecture | Enables NPN saturation with 0.4Ω effective RON, achieving >87% efficiency without MOSFET-level die area. |
| Current-mode control with slope compensation | Provides inherent cycle-by-cycle current limiting and stable loop behavior up to 90% duty cycle. |
| Dual-threshold shutdown | 0.37V active shutdown + 2.38V UVLO - ensures clean start-up and prevents brownout operation. |
| Feedback pin foldback protection | Reduces switching frequency and current limit during short-circuit - limits power dissipation in IC and external components. |
| BIAS pin for output-derived biasing | Improves light-load efficiency by sourcing internal bias current from VOUT instead of VIN - validated at VIN=20V/VOUT=5V. |
Applications
| Industrial Power Supply | Portable Test Equipment |
|---|---|
|
Use Scenario: Compact 24V-to-5V conversion in DIN-rail mounted PLC I/O modules with limited board space and ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V at up to 1.25A; operates at fixed 500kHz to minimize EMI filtering requirements. Use Value: High-voltage 30V rating accommodates 24V system transients; fused-corner SO-8 package maintains junction temperature <115°C under full load with minimal copper. |
Use Scenario: Battery-powered handheld oscilloscope with Li-ion input (8–12.6V) requiring clean, low-noise 5V rail for analog front-end and microcontroller. IC Role / Device Role / Timing Role: Main DC/DC converter with BIAS pin tied to 5V output - reduces quiescent current draw from battery during standby. Use Value: 20µA shutdown current extends battery life; BOOST-assisted saturation maintains >85% efficiency even at 100mA load with 10µH inductor. |
| Battery Charger Auxiliary Rail | Distributed Power Node |
|
Use Scenario: Secondary 5V supply in multi-cell lithium battery charger, powered from intermediate 12V bus generated by primary buck converter. IC Role / Device Role / Timing Role: Isolated auxiliary regulator providing isolated 5V for USB interface and status LEDs - immune to charger's high dv/dt noise. Use Value: Fixed 5V output eliminates feedback resistor drift concerns; GND-referenced SENSE pin simplifies layout and improves load regulation accuracy. |
Use Scenario: Point-of-load regulator in telecom line card with 48V backplane input and strict thermal constraints in confined airflow. IC Role / Device Role / Timing Role: Local 48V-to-5V conversion feeding FPGA I/O banks; uses BOOST capacitor to sustain saturation despite high VIN/VOUT ratio. Use Value: 0.4Ω switch RON minimizes conduction loss at 1A; thermal resistance optimized via fused-corner SO-8 footprint for direct heatsink mounting. |
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, 3.6V–36V input, 5V/1A output, integrated MOSFETs, no BOOST pin required. | Higher frequency enables smaller inductors/caps but increases switching loss at high load; lacks BIAS pin for output-derived biasing. | Choose for ultra-compact size and lower EMI filter cost; avoid if BIAS-driven efficiency gain at light load is critical. |
| LM2678SD-5.0/NOPB | 63kHz nonsynchronous buck, 8V–40V input, 5V/5A output, higher quiescent current (50mA), no BIAS or BOOST functionality. | Lower switching frequency demands larger magnetics; higher dropout limits minimum input to ~9V for 5V output. | Choose for high-current, cost-sensitive industrial supplies where thermal headroom exists; avoid for battery or low-input applications. |
Compared with LTC3605EDE#TRPBF and LM2678SD-5.0/NOPB, LT1376HVCS#TRPBF uniquely balances HV input capability, BOOST-enabled saturation efficiency, and BIAS-driven light-load optimization - making it optimal for 6–25V input systems needing 1.25A at 5V with thermal and size constraints.
Availability
LT1376HVCS#TRPBF is available at Aetrix Electronics and suitable for industrial power supplies, portable test equipment, battery charger auxiliary rails, and distributed power nodes requiring stable component supply with long-term lifecycle support.
Supply support for LT1376HVCS#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 technical and manufacturing continuity for all Linear legacy products, including the LT1376 family.
The LT1376 series was designed as a high-efficiency, high-voltage monolithic buck regulator targeting space-constrained industrial and portable systems requiring robust 5V regulation from wide-input rails.
FAQ
What is the maximum input voltage rating for LT1376HVCS#TRPBF?
The LT1376HVCS#TRPBF has an absolute maximum input voltage rating of 30V, confirmed in the Absolute Maximum Ratings table. Its recommended operating input range is 6V to 25V. This HV rating distinguishes it from standard LT1376 variants (25V max) and enables reliable operation in 24V industrial systems with transient margin. Exceeding 30V risks permanent damage.
Does LT1376HVCS#TRPBF require an external BOOST capacitor, and why?
Yes, LT1376HVCS#TRPBF requires an external BOOST capacitor (and associated diode) connected between VIN and BOOST pins. This network generates a drive voltage ~5V above VIN to saturate the internal NPN power switch - reducing its effective on-resistance to 0.4Ω and enabling >87% efficiency. Omitting the BOOST network results in excessive switch voltage drop (~1.5V) and severe efficiency degradation.
How does the BIAS pin on LT1376HVCS#TRPBF improve efficiency?
The BIAS pin on LT1376HVCS#TRPBF allows internal circuitry to draw bias current from the regulated 5V output instead of the higher VIN rail. When tied to VOUT, this reduces total input-referred quiescent current - improving light-load efficiency by over 10% at VIN=20V/VOUT=5V. This feature is exclusive to LT1376 (not LT1375) and is documented in the Applications Information section.
What protection features does LT1376HVCS#TRPBF provide during output short-circuit?
LT1376HVCS#TRPBF implements dual foldback protection during short-circuit: (1) switching frequency reduces ~5:1 when FB/SENSE voltage falls below 1V, and (2) peak switch current limit folds back from 1.5A to <1A when FB/SENSE drops below 1.7V. These features - enabled by internal circuitry shown in Figure 2 - limit power dissipation in both the IC and external components without requiring external circuitry.
Is LT1376HVCS#TRPBF pin-compatible with other LT1376 variants in SO-8 package?
Yes, LT1376HVCS#TRPBF shares identical pinout and SO-8 footprint with all LT1376 variants (e.g., LT1376CS8#TRPBF, LT1376IS8#TRPBF). The HV designation reflects internal process and rating differences - not pin assignment. All share VC, FB/SENSE, GND, SHDN, BOOST, VIN, VSW, and BIAS pin functions and locations per the S8 PACKAGE top view diagram.
LT1376HVCS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- 16-SO
LT1376HVCS#TRPBF FAQ
1.How can I place an order for LT1376HVCS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376HVCS#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 LT1376HVCS#TRPBF reliable?
The price and inventory of LT1376HVCS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376HVCS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1376HVCS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376HVCS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376HVCS#TRPBF?
LT1376HVCS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376HVCS#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 LT1376HVCS#TRPBF?
For technical support, including LT1376HVCS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376HVCS#TRPBF requirements.
6.How does Aetrix verify that LT1376HVCS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1376HVCS#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 LT1376HVCS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1376HVCS#TRPBF?
All LT1376HVCS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376HVCS#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 LT1376HVCS#TRPBF part is unused and in its original packaging.
Return procedure for LT1376HVCS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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