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Analog Devices Inc. LT1376IS#TRPBF
- Part No.:
- LT1376IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376IS#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,692
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Product details
Overview
LT1376IS#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz, 1.5A monolithic synchronous step-down DC/DC switching regulator in SO-8 package with fixed 5V output, internal feedback divider, and BIAS pin for improved light-load efficiency. It delivers up to 1.25A at 5V from 6V–25V input, features cycle-by-cycle current limiting, thermal shutdown, and operates with only surface-mount external components including a 5µH inductor.
For engineers reviewing the LT1376IS#TRPBF datasheet, LT1376IS#TRPBF pinout, LT1376IS#TRPBF application, or LT1376IS#TRPBF equivalent, key selection criteria include its 500kHz constant-frequency current-mode architecture, 0.4Ω switch on-resistance, 2.5mA typical quiescent current, 20µA shutdown current, and BIAS pin support for >10% efficiency gain at high VIN/low IOUT conditions.
Technical Context
The LT1376IS#TRPBF implements a current-mode buck topology with an internal 1.5A NPN power switch, 500kHz oscillator, error amplifier (2000 µMho transconductance), and slope-compensated peak-current control loop. Its BOOST pin enables saturation of the bipolar switch via external capacitor/diode, reducing conduction loss to ~0.4Ω and enabling >87% efficiency.
It integrates dual shutdown thresholds: 2.38V UVLO for undervoltage lockout and 0.4V for micropower shutdown. The BIAS pin (LT1376-specific) allows sourcing internal bias current from VOUT instead of VIN-critical for efficiency optimization when VIN ≫ VOUT (e.g., 20V→5V at 25mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (guaranteed over temperature; eliminates external resistor divider) |
| Switching Frequency | 500kHz ±6% (constant frequency enables predictable EMI filtering and small passive sizing) |
| Max Output Current | 1.25A at 5V (with 10µH inductor, VIN = 10V; derates with duty cycle and inductor value) |
| Switch On-Resistance | 0.4Ω typ (enables low conduction loss; achieved via BOOST-driven saturation of NPN switch) |
| Quiescent Current | 2.5mA typ (input supply current at full operation; enables high efficiency across wide load range) |
| Shutdown Current | 20µA max (reduces system standby power; verified over –40°C to 125°C junction temp) |
| Input Voltage Range | 6V to 25V (minimum 6V ensures stable bias regulation; excludes startup transient limitations) |
| Thermal Shutdown | Integrated (protects against sustained overload or poor PCB heatsinking; auto-recovery) |
Pinout & Package
LT1376IS#TRPBF is housed in an 8-lead plastic SO (S8) package with exposed pad thermal enhancement. Pin mapping follows standard SO-8 layout with GND pins on both sides for low-impedance grounding and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Switch drive voltage boost node | Accepts external capacitor/diode to generate VIN+5V; enables NPN saturation and 0.4Ω RON |
| VIN | Power switch collector & IC supply input | Connects to input source; high di/dt node requiring local bypass capacitor and short trace routing |
| VSW | Switch emitter output | Drives inductor; swings negative during off-time; requires catch diode clamping to –0.8V max |
| BIAS | Internal circuitry bias supply input | Connect to regulated 5V output to reduce input current draw and improve light-load efficiency |
| VC | Error amplifier output / current limit comparator input | Used for loop compensation; also serves as current clamp point (0.9V–2.1V operating range) |
| FB/SENSE | Feedback reference / output voltage sense | Internally tied to 5V output (fixed version); monitors output for regulation and foldback protection |
| GND | Analog & power ground reference | Must be connected directly to load return path; critical for load regulation and EMI suppression |
| SHDN | Enable/disable control input | Logic-compatible; 0.4V threshold for full shutdown, 2.38V for UVLO; pulls <50µA in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz switching frequency | Enables consistent EMI profile and predictable filter design; no external sync required |
| Integrated 5V feedback divider | Eliminates two external resistors; reduces BOM count and improves accuracy vs. discrete dividers |
| BIAS pin for output-sourced biasing | Reduces total input current by >10% at VIN=20V/VOUT=5V/IOUT=25mA; extends battery life |
| Cycle-by-cycle current limiting | Prevents switch damage during overload or short-circuit; works with internal slope compensation |
| Frequency & current foldback under fault | Reduces power dissipation in IC, diode, and inductor during short-circuit by lowering fSW and ILIM |
| Thermal shutdown with hysteresis | Protects die at >165°C junction; auto-restarts after cooldown; prevents latch-up in sustained faults |
Applications
| Portable Medical Instrumentation | Industrial Sensor Node Power |
|---|---|
|
Use Scenario: Compact handheld blood glucose meter powered by two AA alkaline cells (1.8V–3.2V), requiring stable 5V rail for MCU, display, and analog front-end. IC Role / Device Role / Timing Role: Primary 5V buck converter; provides regulated output with minimal external parts and ultra-low quiescent current. Use Value: Enables >500-hour battery life at 25mA avg load using BIAS pin connection to 5V rail and 20µA shutdown current. |
Use Scenario: Remote vibration sensor node in factory automation, powered by 12V PoE midspan, delivering 5V to low-power microcontroller and MEMS accelerometer. IC Role / Device Role / Timing Role: Input-to-5V conversion stage; handles wide 6V–25V input range and rejects line noise via current-mode control. Use Value: Delivers 1.25A continuous output with <1% load regulation and built-in thermal protection for unattended operation. |
| Automotive Body Control Module | Test & Measurement Equipment |
|
Use Scenario: 12V vehicle battery-powered door module requiring clean 5V supply for CAN transceiver, microcontroller, and LED drivers across –40°C to +125°C ambient. IC Role / Device Role / Timing Role: Main 5V power rail generator; withstands load dump transients via robust SO-8 package and integrated protection. Use Value: Guaranteed operation over full industrial temperature range with 0.4Ω switch RON minimizing thermal rise at 1A load. |
Use Scenario: Benchtop multimeter with isolated 5V digital logic supply derived from 24V internal bus, requiring low-noise, stable output with fast transient response. IC Role / Device Role / Timing Role: Precision 5V regulator; leverages current-mode architecture for <50µs load-step recovery time. Use Value: Maintains <10mV output deviation during 100mA–1A load steps due to inherent loop stability and 2000 µMho error amplifier gain. |
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, 5A rating, 260kHz switching, no BIAS pin, higher IQ (5mA) | Better for high-current (>1.5A), lower-frequency EMI-sensitive designs; lacks light-load efficiency optimization | Select if output current >1.25A required or if 260kHz frequency simplifies EMI compliance |
| TPS54202DRCT | 5V adjustable (external resistors), 2A, 500kHz, integrated MOSFETs, no BOOST pin, 18µA shutdown | Higher integration (no external diode), but requires feedback resistors and lacks BOOST-enabled low-RON advantage | Select for space-constrained designs needing integrated FETs and smaller solution size, accepting trade-off in peak efficiency |
Compared with LM2678-5.0/NOPB and TPS54202DRCT, LT1376IS#TRPBF offers superior light-load efficiency via BIAS pin, lower RON (0.4Ω vs. 0.15Ω but with bipolar process advantages), and guaranteed 500kHz operation without external sync-making it optimal for portable and thermally constrained 1.25A applications.
Availability
LT1376IS#TRPBF is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor nodes, automotive body control modules, and test & measurement equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1376IS#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LT1376 belongs to Linear's legacy monolithic buck regulator family designed for high-efficiency, low-component-count DC/DC conversion in space- and thermal-constrained applications-emphasizing reliability, wide input range, and integrated protection.
FAQ
What is the maximum continuous output current of the LT1376IS#TRPBF?
The LT1376IS#TRPBF delivers up to 1.25A continuous output current at 5V with VIN = 10V and a 10µH inductor. Maximum current decreases with higher VIN (due to increased ripple) and lower inductance; at VIN = 25V and L = 5µH, rated output drops to ~0.8A. The internal 1.5A switch current limit and duty-cycle-dependent derating must be verified per application conditions using the formula in the datasheet.
Does the LT1376IS#TRPBF require an external feedback resistor network?
No. The LT1376IS#TRPBF is the fixed 5V version and includes an internal feedback divider. The FB pin functions as a SENSE pin directly connected to the output, eliminating external resistors. This improves accuracy, reduces component count, and avoids errors from FB pin bias current-unlike adjustable versions such as LT1376CS8.
How does the BIAS pin improve efficiency in the LT1376IS#TRPBF?
The BIAS pin allows the LT1376IS#TRPBF to draw internal bias current from the regulated 5V output instead of the higher VIN rail. At VIN = 20V and IOUT = 25mA, this reduces total input current by >10%, directly extending battery life in portable systems. The feature requires VOUT ≥ 3.3V and proper decoupling at the BIAS pin.
What protection features are integrated into the LT1376IS#TRPBF?
The LT1376IS#TRPBF integrates cycle-by-cycle current limiting, thermal shutdown with hysteresis, undervoltage lockout (2.38V SHDN threshold), and micropower shutdown (0.4V SHDN threshold). It also implements frequency and current foldback during output faults-reducing power dissipation in the IC, catch diode, and inductor during short-circuit events.
Can the LT1376IS#TRPBF be synchronized to an external clock?
No. External synchronization is supported only on the LT1375 variant (via SYNC pin). The LT1376IS#TRPBF has a fixed 500kHz internal oscillator with ±6% tolerance and no sync capability. Designs requiring synchronized switching must use LT1375-based solutions or add external clocking circuitry-not applicable to LT1376IS#TRPBF.
LT1376IS#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):
- 25V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 21.5V
- 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
LT1376IS#TRPBF FAQ
1.How can I place an order for LT1376IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376IS#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 LT1376IS#TRPBF reliable?
The price and inventory of LT1376IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1376IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376IS#TRPBF?
LT1376IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376IS#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 LT1376IS#TRPBF?
For technical support, including LT1376IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376IS#TRPBF requirements.
6.How does Aetrix verify that LT1376IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1376IS#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 LT1376IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1376IS#TRPBF?
All LT1376IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376IS#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 LT1376IS#TRPBF part is unused and in its original packaging.
Return procedure for LT1376IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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