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Analog Devices Inc. LT1376IS8-5#TRPBF
- Part No.:
- LT1376IS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376IS8-5#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,352
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Product details
Overview
LT1376IS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a 5V fixed-output, 500kHz current-mode buck switching regulator with integrated 1.5A NPN power switch, 0.4Ω on-resistance, and 20µA shutdown current. It operates from 6V to 25V input, delivers up to 1.25A output, and targets space-constrained battery-powered systems requiring high efficiency at light loads.
For engineers reviewing the LT1376IS8-5#TRPBF datasheet, LT1376IS8-5#TRPBF pinout, LT1376IS8-5#TRPBF application, or LT1376IS8-5#TRPBF equivalent, key selection criteria include its fixed 5V output, BIAS pin for efficiency optimization at high VIN, cycle-by-cycle current limiting, thermal shutdown, and SO-8 package compatibility with standard PCB layouts.
Technical Context
The LT1376IS8-5#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops: one via the error amplifier (VC pin) setting peak switch current, the other via cycle-by-cycle inductor current sensing. Its bipolar NPN switch uses BOOST-pin-driven saturation to achieve 0.4Ω on-resistance and >87% efficiency.
It features two independent SHDN thresholds: 2.38V for UVLO-based standby and 0.4V for full micropower shutdown. The BIAS pin (LT1376-specific) enables sourcing internal bias current from VOUT instead of VIN-improving efficiency by >10% at VIN = 20V, VOUT = 5V, IOUT = 25mA.
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 low conduction loss and high efficiency at 1.25A load) |
| Shutdown Current | 20µA typical (reduces system standby power in battery applications) |
| Operating Input Range | 6V to 25V (minimum 5.5V guaranteed; supports 12V rail and wide-input industrial supplies) |
| Switching Frequency | 500kHz ±10% (enables compact 5–10µH inductors and low-profile designs) |
| Efficiency | 87% typical at 1A, VIN = 12V, VOUT = 5V (achieved via BOOST-saturated switch and BIAS pin optimization) |
Pinout & Package
LT1376IS8-5#TRPBF is housed in an 8-lead plastic SO (S8) package with exposed pad thermal enhancement. Pin functions are validated per Linear Technology's official datasheet (13756fd), with GND pins at positions 3 and 4 providing low-impedance return paths for both power and control circuitry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides voltage >VIN to saturate NPN switch; enables 0.4Ω RON and high efficiency |
| VIN | Input supply and switch collector | Supplies internal circuitry and powers external catch diode; requires low-inductance bypassing |
| VSW | Switch emitter | Drives inductor; swings negative during off-time-requires clamping diode |
| BIAS | Internal bias supply selector | When tied to VOUT ≥3.3V, shifts bias current source from VIN to VOUT, improving light-load efficiency |
| VC | Error amplifier output / current limit setpoint | Controls peak switch current; used for loop compensation and external override |
| FB/SENSE | Fixed 5V output sense input | Internally connected to 5V output; monitors regulation and triggers foldback below 1.7V |
| GND | Analog and power ground reference | Dual GND pins (3 & 4) minimize ground bounce; critical for load regulation and EMI control |
| SHDN | Shutdown control with dual thresholds | 2.38V = UVLO standby; 0.4V = full micropower shutdown (20µA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and stable loop compensation without external type-II/III networks |
| BOOST-driven saturation | Reduces switch conduction loss vs. conventional bipolar regulators-efficiency gain >12% |
| BIAS pin operation | Improves light-load efficiency by >10% at VIN = 20V/VOUT = 5V by shifting bias current path |
| Cycle-by-cycle current limiting | Prevents switch damage during overload or short-circuit; folds back frequency and current below 1V FB |
| Thermal shutdown protection | Halts switching if junction temperature exceeds safe limit-prevents permanent device failure |
Applications
| Portable Medical Monitors | Industrial IoT Sensor Nodes |
|---|---|
Use Scenario: Compact handheld vital sign analyzers powered by 2-cell Li-ion (6–8.4V) requiring clean, regulated 5V for microcontroller and analog front-end. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering 1.25A with tight load regulation and low quiescent current during sleep cycles. Use Value: 20µA shutdown current extends battery life; BIAS pin improves efficiency at partial charge (VIN ≈ 7V), sustaining runtime across discharge curve. |
Use Scenario: Battery-backed wireless sensor gateway operating from 9–24V DC field supply, powering ARM Cortex-M MCU, LoRa transceiver, and precision ADC. IC Role / Device Role / Timing Role: Main 5V power rail generator with robust line/load regulation and immunity to input ripple from shared industrial bus. Use Value: 500kHz switching allows small 10µH inductor; cycle-by-cycle current limiting prevents latch-up during RF transmit bursts. |
| Automotive Body Control Modules | Point-of-Sale Terminal Power |
Use Scenario: 12V automotive subsystem (e.g., door module) needing isolated 5V for CAN interface ICs and EEPROM, surviving load dump and cold crank. IC Role / Device Role / Timing Role: Input-filtered 5V regulator with 25V absolute max rating and thermal shutdown for under-hood reliability. Use Value: 6–25V input range accommodates 12V nominal with ±10V transients; dual SHDN thresholds enable controlled wake-up from vehicle sleep mode. |
Use Scenario: Retail kiosk with 12V wall adapter powering touch-screen controller, barcode scanner, and USB peripherals. IC Role / Device Role / Timing Role: High-density 5V local regulator replacing linear solution to eliminate heat sink and reduce board area. Use Value: 87% efficiency at 1A avoids thermal derating; SO-8 footprint matches legacy linear regulator footprints for drop-in upgrade. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | 5V fixed, 1A output, 260kHz switching, no BIAS pin, higher RDS(on) (~0.6Ω) | Limited to 1A load; lower frequency requires larger inductor; lacks efficiency-optimizing BIAS function | Choose when cost sensitivity outweighs efficiency and current requirements; verify thermal margin at 1.25A. |
| TPS54202DRCT | 5V adjustable (external resistor), 2A output, 500kHz, integrated MOSFET, no BOOST pin | Higher current capability but uses MOSFET architecture-lower efficiency at light loads vs. BIAS-optimized LT1376IS8-5#TRPBF | Prefer for designs needing >1.25A or adjustable output; avoid if BIAS-driven light-load efficiency is critical. |
Compared with LM2678-5.0/NOPB and TPS54202DRCT, the LT1376IS8-5#TRPBF uniquely combines fixed 5V output, 1.25A capability, BIAS pin efficiency boost, and BOOST-saturation for lowest conduction loss-making it optimal for space- and battery-limited 5V systems where thermal headroom is constrained.
Availability
LT1376IS8-5#TRPBF is available at Aetrix Electronics and suitable for portable medical monitors, industrial IoT sensor nodes, automotive body control modules, and point-of-sale terminal power requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT1376IS8-5#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 the LT product family, renowned for high-performance analog and power management ICs.
The LT1376 belongs to Linear's monolithic current-mode buck regulator product line, designed specifically for compact, high-efficiency DC/DC conversion in battery-powered and thermally constrained applications where fixed 5V output and low quiescent current are essential.
FAQ
What is the maximum continuous output current of the LT1376IS8-5#TRPBF?
The LT1376IS8-5#TRPBF delivers up to 1.25A continuous output current at 5V when using a 10µH inductor and VIN = 10V. At higher input voltages (e.g., VIN = 15V), peak inductor current increases, reducing usable output current to ~1.17A. The 1.5A internal switch current limit is duty-cycle dependent-decreasing to 1.35A above 50% duty cycle due to slope compensation.
Does the LT1376IS8-5#TRPBF require an external feedback resistor divider?
No-the LT1376IS8-5#TRPBF is a fixed 5V output variant. Its FB/SENSE pin connects internally to the 5V output and functions solely as a sense input; no external resistor divider is needed. This simplifies layout and eliminates tolerance-induced output voltage drift from external components.
How does the BIAS pin improve efficiency in the LT1376IS8-5#TRPBF?
The BIAS pin on the LT1376IS8-5#TRPBF allows internal bias circuitry to draw current from the regulated 5V output instead of the higher input voltage. At VIN = 20V and IOUT = 25mA, this reduces total input-referred quiescent current by >10%, directly extending battery life in light-load conditions.
What protection features are built into the LT1376IS8-5#TRPBF?
The LT1376IS8-5#TRPBF integrates cycle-by-cycle current limiting, thermal shutdown, and dual-threshold shutdown (2.38V UVLO + 0.4V deep shutdown). It also features frequency and current foldback below 1V on the FB/SENSE pin-reducing power dissipation during short-circuit events without external components.
Can the LT1376IS8-5#TRPBF operate with input voltage below 6V?
The absolute minimum input voltage for reliable operation is 5.5V (guaranteed), but the recommended minimum is 6V per datasheet guidance. Below 6V, performance degrades: minimum duty cycle increases, switch current limit drops, and BIAS pin functionality may be impaired. For sub-6V inputs, consider the LT1507 (4.5V–12V range, functionally identical).
LT1376IS8-5#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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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
LT1376IS8-5#TRPBF FAQ
1.How can I place an order for LT1376IS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376IS8-5#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 LT1376IS8-5#TRPBF reliable?
The price and inventory of LT1376IS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376IS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1376IS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376IS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376IS8-5#TRPBF?
LT1376IS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376IS8-5#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 LT1376IS8-5#TRPBF?
For technical support, including LT1376IS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376IS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1376IS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1376IS8-5#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 LT1376IS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1376IS8-5#TRPBF?
All LT1376IS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376IS8-5#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 LT1376IS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1376IS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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