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Analog Devices Inc. LT1376HVIS#TRPBF
- Part No.:
- LT1376HVIS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376HVIS#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,053
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Product details
Overview
LT1376HVIS#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz, 1.5A monolithic synchronous step-down switching regulator in HV SO-8 package, featuring fixed 5V output, 0.4Ω switch on-resistance, 2.5mA quiescent current, and 20µA shutdown current. It delivers up to 1.25A at 5V from 6V–25V input for battery-powered portable computers and distributed power systems.
For engineers reviewing the LT1376HVIS#TRPBF datasheet, LT1376HVIS#TRPBF pinout, LT1376HVIS#TRPBF application, or LT1376HVIS#TRPBF equivalent, key selection criteria include its HV-rated 30V input capability, BIAS pin efficiency optimization for high VIN/low VOUT operation, cycle-by-cycle current limiting, thermal shutdown, and compatibility with standard surface-mount 5µH inductors and tantalum output capacitors.
Technical Context
The LT1376HVIS#TRPBF implements current-mode control with a 500kHz fixed-frequency oscillator and internal slope compensation to prevent subharmonic oscillation across duty cycles up to 93%. Its bipolar NPN power switch is driven via an external BOOST capacitor to achieve saturation, reducing conduction loss equivalent to a 0.4Ω FET.
It integrates a 2.42V reference, error amplifier (2000 µMho transconductance), VC pin for loop compensation and current clamp, and dual-threshold SHDN pin (0.4V full shutdown, 2.38V UVLO). The BIAS pin-present only on LT1376 variants-enables output-sourced biasing to improve light-load efficiency when VIN ≫ VOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (guaranteed over temperature and line) |
| Switch Current Limit | 1.5A at ≤50% duty cycle; derates to 1.35A at 80% DC for stability |
| Switch On Resistance | 0.4Ω typical (enables low dropout and high efficiency at 1.25A load) |
| Quiescent Supply Current | 2.5mA typical (supports portable systems with limited battery capacity) |
| Shutdown Current | 20µA max (reduces standby drain in always-on battery systems) |
| Input Voltage Range | 6V to 25V (HV variant supports up to 30V absolute max, enabling 24V rail compatibility) |
| Switching Frequency | 500kHz ±10% (allows compact 5µH inductor and reduces EMI fundamental) |
Pinout & Package
LT1376HVIS#TRPBF is housed in an 8-lead plastic SO (S8) package with fused corner pins for enhanced thermal performance (θJA = 120–150°C/W depending on PCB layout). The HV suffix denotes extended 30V input rating and 40V BOOST pin tolerance.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Boost capacitor drive node | Provides >VIN voltage to saturate NPN switch; enables 0.4Ω RON and >87% efficiency |
| 2 (VIN) | Power input / switch collector | Supplies internal circuitry and powers switch; requires low-inductance bypass near pin |
| 3 (VSW) | Switch emitter / inductor connection | Drives external inductor; swings negative during off-time; clamped by catch diode |
| 4 (BIAS) | Efficiency-optimizing bias supply | When tied to 5V output, shifts internal bias current from VIN to VOUT, improving light-load efficiency |
| 5 (VC) | Error amplifier output / current limit control | Used for frequency compensation; also serves as current clamp point (0.9V–2.1V range) |
| 6 (FB/SENSE) | Feedback / output voltage sense | Fixed 5V version uses internal divider; SENSE pin monitors regulated output directly for accuracy |
| 7 (GND) | Power and signal reference | Must be shorted to load ground to avoid load regulation error; carries high di/dt spikes |
| 8 (SHDN) | Enable/disable control | 0.4V threshold forces micropower shutdown; 2.38V threshold enables UVLO lockout |
Key Features
| Feature | Design Value |
|---|---|
| High-Voltage Input Rating | 30V absolute maximum input (HV variant) supports 24V industrial and telecom rails |
| Integrated Cycle-by-Cycle Protection | Hardware-based current limiting prevents switch failure during overload or short-circuit |
| Thermal Shutdown | Automatic disable above safe junction temperature; self-recovery on cooldown |
| Frequency Foldback Under Fault | Reduces switching frequency 5:1 when FB < 1V, limiting power dissipation during short-circuit |
| Low-Noise Current-Mode Architecture | Eliminates right-half-plane zero; simplifies compensation and improves transient response |
Applications
| Portable Computing Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Regulating 5V for CPU I/O, USB peripherals, and display logic in ruggedized tablets operating from 12V Li-ion packs. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V at up to 1.25A with fast load-step response. Use Value: 20µA shutdown current extends battery life in sleep mode; HV rating ensures reliability across full pack voltage range (9–12.6V). |
Use Scenario: Powering precision analog front-ends and microcontrollers in handheld test equipment powered by 4×AA alkaline cells (6–9V). IC Role / Device Role / Timing Role: Fixed-output 5V regulator with integrated UVLO preventing brownout operation below 6V. Use Value: 2.5mA quiescent current minimizes no-load drain; BIAS pin improves efficiency at light loads when VIN = 9V. |
| Distributed 5V Power Bus | Industrial Battery Charger Auxiliary Rail |
Use Scenario: Generating local 5V for isolated communication interfaces (RS-485, CAN transceivers) in factory automation nodes. IC Role / Device Role / Timing Role: Point-of-load regulator accepting wide-input 12–24V DC bus and rejecting conducted noise. Use Value: 500kHz switching enables small 5µH inductor; current-mode control rejects input ripple better than voltage-mode alternatives. |
Use Scenario: Providing clean 5V bias for charger management ICs and status LEDs in 24V lead-acid battery chargers. IC Role / Device Role / Timing Role: Secondary regulator deriving stable 5V from unregulated charger output (18–29V). Use Value: 30V HV rating accommodates charger overshoot; thermal shutdown protects during prolonged fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376IS8#TRPBF | Same 5V fixed output, but standard 25V input rating (not HV); identical pinout and BIAS functionality | Limited to ≤24V nominal input; unsuitable for 24V systems with transient overvoltage | Select when input stays within 6–24V and cost sensitivity outweighs HV margin |
| LM2678-5.0/NOPB | 5V fixed, 5A capable, but 63kHz switching; larger external components; no BIAS pin or foldback protection | Higher current, lower frequency - suited for high-power, low-EMI designs where size is secondary | Choose for >1.5A loads or where thermal design favors lower switching losses over compactness |
Compared with LT1376IS8#TRPBF, LT1376HVIS#TRPBF adds 5V headroom for robust 24V system operation; versus LM2678-5.0/NOPB, it trades peak current and low-frequency EMI for 3× smaller magnetics, 20× lower quiescent current, and integrated fault-foldback - critical for space-constrained, battery-sensitive designs.
Availability
LT1376HVIS#TRPBF is available at Aetrix Electronics and suitable for portable computing, battery-powered instrumentation, and distributed power bus applications requiring stable component supply, long-term lifecycle support, and guaranteed HV-grade electrical screening.
Supply support for LT1376HVIS#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 its legacy of high-performance analog and power management ICs with rigorous process control and application-focused design.
The LT1376 family was engineered as a high-efficiency, HV-tolerant buck regulator for portable and industrial systems demanding compact size, low quiescent current, and robust fault handling - especially where input voltage exceeds 20V.
FAQ
What is the maximum continuous output current of the LT1376HVIS#TRPBF?
The LT1376HVIS#TRPBF delivers up to 1.25A continuous at 5V output under typical conditions (VIN = 10V, L = 5µH, TA ≤ 85°C). Peak switch current is rated 1.5A at ≤50% duty cycle, derating to 1.35A at 80% duty cycle due to internal slope compensation. Actual load current depends on input voltage, inductor value, and thermal management - consult the "Maximum Load Current" graphs in the datasheet for precise derating curves.
Does the LT1376HVIS#TRPBF require an external BOOST capacitor, and what value is recommended?
Yes, the LT1376HVIS#TRPBF requires an external BOOST capacitor (typically 10nF ceramic) connected between BOOST and SW pins to generate the gate-drive voltage needed to saturate the internal NPN switch. This is mandatory for achieving the specified 0.4Ω on-resistance and >87% efficiency. A 1N5818 Schottky diode is also required in series with the BOOST cap to prevent reverse discharge. Layout must minimize trace inductance between BOOST, SW, and VIN.
How does the BIAS pin improve efficiency in the LT1376HVIS#TRPBF?
The BIAS pin on the LT1376HVIS#TRPBF allows internal circuitry to draw operating current from the regulated 5V output instead of the higher input voltage - reducing total input power consumption. At VIN = 20V, VOUT = 5V, and IOUT = 25mA, this yields >10% efficiency improvement. BIAS must be connected directly to VOUT (≥3.3V minimum) with low-impedance routing; leaving it open defaults to VIN biasing.
What protection features are built into the LT1376HVIS#TRPBF?
The LT1376HVIS#TRPBF integrates cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout (UVLO at 2.38V on SHDN), and foldback protection: when FB drops below 1V, switching frequency reduces ~5:1 and current limit folds back to <1A - collectively limiting power dissipation during output shorts. These functions operate without external components and are fully specified across –40°C to 125°C.
Can the LT1376HVIS#TRPBF be synchronized to an external clock?
No - synchronization is supported only on the LT1375 variant (via SYNC pin). The LT1376HVIS#TRPBF has no SYNC pin and operates exclusively at its internal 500kHz oscillator frequency. Its fixed-frequency architecture simplifies layout and EMI filtering but precludes phase alignment with other converters in multi-rail systems.
LT1376HVIS#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1376HVIS#TRPBF FAQ
1.How can I place an order for LT1376HVIS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376HVIS#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 LT1376HVIS#TRPBF reliable?
The price and inventory of LT1376HVIS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376HVIS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1376HVIS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376HVIS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376HVIS#TRPBF?
LT1376HVIS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376HVIS#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 LT1376HVIS#TRPBF?
For technical support, including LT1376HVIS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376HVIS#TRPBF requirements.
6.How does Aetrix verify that LT1376HVIS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1376HVIS#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 LT1376HVIS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1376HVIS#TRPBF?
All LT1376HVIS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376HVIS#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 LT1376HVIS#TRPBF part is unused and in its original packaging.
Return procedure for LT1376HVIS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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