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Analog Devices Inc. LT1376CS#TRPBF
- Part No.:
- LT1376CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376CS#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,285
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Product details
Overview
LT1376CS#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 current-mode control architecture. It delivers up to 1.25A at 5V from 6V–25V input, features 0.4Ω switch on-resistance, 2.5mA quiescent current, and cycle-by-cycle current limiting. It is used in battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1376CS#TRPBF datasheet, LT1376CS#TRPBF pinout, LT1376CS#TRPBF application, or LT1376CS#TRPBF equivalent, key selection criteria include input voltage range (6–25V), fixed 5V output tolerance (±1.2%), thermal performance in SO-8 package (θJA = 120–150°C/W), and BIAS pin efficiency optimization for high-VIN/low-IOUT operation.
Technical Context
The LT1376CS#TRPBF implements constant-frequency current-mode control with internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to VC pin. Its bipolar NPN switch uses BOOST pin voltage (≥VIN + 5V) to achieve saturation, reducing conduction loss versus standard bipolar designs.
It integrates undervoltage lockout (2.38V SHDN threshold), thermal shutdown, and dual-foldback protection: FB pin voltage <1.7V reduces current limit; <1V reduces switching frequency ~5:1. The BIAS pin (LT1376-specific) enables output-sourced biasing to improve efficiency at high input-to-output voltage ratios.
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; derates to 1.35A at 80% duty cycle |
| Switch On Resistance | 0.4Ω typical (enables low conduction loss with BOOST capacitor) |
| Quiescent Supply Current | 2.5mA typical (enables high light-load efficiency) |
| Shutdown Current | 20µA typical (reduces system standby power) |
| Switching Frequency | 500kHz ±8% (enables small 5–10µH inductors and low-profile design) |
| Input Voltage Range | 6V to 25V (minimum start-up voltage defined by internal bias regulation) |
Pinout & Package
LT1376CS#TRPBF is housed in an 8-lead plastic SO (S8) package with exposed pad thermal enhancement. Pin layout follows standard SO-8 footprint; θJA ranges from 120°C/W to 150°C/W depending on PCB copper area and thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides >VIN voltage to saturate internal NPN switch; requires external diode + capacitor |
| VIN | Input power collector | Supplies switch collector and internal circuitry; high di/dt node-requires local bypass |
| VSW | Switch emitter | Connects to inductor; swings negative during off-time-requires catch diode clamping |
| BIAS | Efficiency-optimized bias supply | When tied to VOUT ≥3.3V, shifts internal bias current from VIN to VOUT, improving efficiency at high VIN |
| VC | Error amplifier output / current limit setpoint | Controls peak switch current; used for compensation; clamp range 0.9V–2.1V |
| FB/SENSE | Feedback reference / output sense | Fixed 5V version: SENSE pin connected directly to output; monitors for foldback protection |
| GND | Power and signal reference | Must be short, low-impedance path to load ground to maintain load regulation and minimize EMI |
| SHDN | Enable/disable control | Logic-compatible input; 2.38V UVLO threshold disables switching; 0.4V forces micropower shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and stable loop compensation without external ramp injection |
| Integrated BOOST drive | Reduces switch VCE(sat) to ~0.4V × ISW, improving efficiency vs. conventional bipolar buck regulators |
| Dual-foldback protection | FB pin <1.7V lowers current limit; <1V reduces frequency ~5:1-limits power dissipation during short-circuit |
| BIAS pin efficiency mode | At VIN = 20V, VOUT = 5V, IOUT = 25mA, improves efficiency by >10% versus BIAS-open configuration |
| Thermal shutdown & cycle-by-cycle current limit | Ensures robust operation under overload, ambient temperature extremes, and PCB layout variations |
Applications
| Battery-Powered Portable Systems | Distributed Power Supplies |
|---|---|
Use Scenario: Compact 5V rail generation in handheld test equipment powered by 2-cell Li-ion (6–8.4V) or 4-cell alkaline (6–10V). IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated output with minimal external components and no external synchronization required. Use Value: Enables 5V/1.25A operation from wide input range using only 5µH inductor and standard tantalum output capacitor-reducing board area by >40% vs. lower-frequency alternatives. |
Use Scenario: Local 5V supply for FPGA I/O banks or microcontroller peripherals in multi-rail industrial backplanes (12–24V nominal). IC Role / Device Role / Timing Role: Point-of-load (POL) regulator providing isolated, low-noise 5V with fast load-step response for digital logic domains. Use Value: Current-mode control ensures stable regulation across input ripple and load transients up to 1A/µs; BIAS pin optimizes efficiency at 24V input. |
| Battery Charger Auxiliary Rail | Industrial Sensor Node Power |
Use Scenario: Generating clean 5V for charger management ICs and status LEDs in smart battery packs with 3S–5S Li-ion inputs (9–21V). IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from main charging path; operates continuously during charge cycles. Use Value: 20µA shutdown current extends pack standby life; fixed 5V output eliminates need for feedback resistors-improving BOM reliability. |
Use Scenario: Powering ultra-low-power wireless sensor nodes (e.g., LoRaWAN, NB-IoT) with intermittent 5V loads from 12V field bus or solar-charged batteries. IC Role / Device Role / Timing Role: Always-on buck converter supporting burst-mode operation with rapid wake-up from shutdown state. Use Value: 2.5mA quiescent current and 20µA shutdown enable >1-year battery life in sleep-dominated duty cycles; SO-8 package supports automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376IS#TRPBF | Same electrical specs, extended –40°C to 125°C operating junction temperature range | Required for automotive under-hood or industrial outdoor deployments | Select when ambient operating temperature exceeds 0°C–125°C commercial grade limits |
| LT1507CS#TRPBF | Functionally identical 5V buck, but rated for 4.5V–12V input (not 6V–25V); optimized for low-VIN systems | Suitable only for 5V output from 3.3V–12V sources (e.g., USB PD, single-cell LiPo + boost) | Choose only if input never exceeds 12V and minimum input is ≤4.5V-otherwise LT1376CS#TRPBF provides wider margin |
Compared with LT1376IS#TRPBF, the LT1376CS#TRPBF trades extended temperature capability for lower cost and qualification overhead in commercial environments; compared with LT1507CS#TRPBF, it supports higher input voltages critical for 24V industrial or multi-cell battery systems-but cannot start below 6V.
Availability
LT1376CS#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable systems, distributed power supplies, battery charger auxiliary rails, and industrial sensor node power requiring stable component supply and long-term production continuity.
Supply support for LT1376CS#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. Linear pioneered high-performance analog and power management ICs with emphasis on precision, speed, and integration.
The LT1376 belongs to Linear's monolithic current-mode buck regulator product line, designed specifically for space-constrained, efficiency-sensitive applications where wide input range, fixed-output simplicity, and robust fault protection are essential.
FAQ
What is the minimum input voltage required for LT1376CS#TRPBF to start regulation?
The LT1376CS#TRPBF has a guaranteed minimum input voltage of 6V for reliable startup and regulation. Below this, internal bias lines may not regulate properly-causing unstable reference voltage or oscillator frequency. At 5.5V input, operation is not assured across temperature or process variation. For sub-6V applications, consider LT1507CS#TRPBF instead.
Can LT1376CS#TRPBF operate without the BOOST capacitor and diode?
No. The LT1376CS#TRPBF requires the external BOOST capacitor and diode to generate a voltage >VIN at the BOOST pin. Without it, the internal NPN switch cannot saturate, resulting in excessive VCE drop (>1.5V), severe efficiency loss, and potential thermal failure. The BOOST network is mandatory-not optional-for all operating conditions.
How does the BIAS pin improve efficiency in LT1376CS#TRPBF?
In LT1376CS#TRPBF, connecting the BIAS pin to the regulated 5V output (≥3.3V) shifts internal bias current sourcing from VIN to VOUT. At VIN = 20V and IOUT = 25mA, this reduces total input-referred quiescent current by >10%, directly improving light-load efficiency. BIAS must not be left floating-it must be tied to VOUT or grounded per design requirements.
What protection features are built into LT1376CS#TRPBF?
The LT1376CS#TRPBF integrates cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout (2.38V SHDN threshold), and dual-foldback protection triggered by FB/SENSE pin voltage: current limit reduction below 1.7V and frequency reduction below 1V. These features collectively prevent damage during output shorts, overloads, or abnormal thermal conditions without external circuitry.
Is LT1376CS#TRPBF pin-compatible with LT1375CS#TRPBF?
Yes-LT1376CS#TRPBF and LT1375CS#TRPBF share identical SO-8 pinout, package dimensions, and functional pin assignments. However, LT1375 lacks the BIAS pin (pin 4 is NC), and LT1375 supports external synchronization via SYNC pin (pin 4 in LT1375, unused in LT1376). Electrical substitution requires verifying whether BIAS functionality or SYNC capability is needed in the target design.
LT1376CS#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1376CS#TRPBF FAQ
1.How can I place an order for LT1376CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376CS#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 LT1376CS#TRPBF reliable?
The price and inventory of LT1376CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1376CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376CS#TRPBF?
LT1376CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376CS#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 LT1376CS#TRPBF?
For technical support, including LT1376CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376CS#TRPBF requirements.
6.How does Aetrix verify that LT1376CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1376CS#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 LT1376CS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1376CS#TRPBF?
All LT1376CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376CS#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 LT1376CS#TRPBF part is unused and in its original packaging.
Return procedure for LT1376CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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