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Analog Devices Inc. LT1376CS8-5#TRPBF
- Part No.:
- LT1376CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376CS8-5#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:915
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Product details
Overview
LT1376CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.5A, 500kHz monolithic synchronous buck switching regulator in an 8-pin SOIC package. It integrates a bipolar NPN power switch with current-mode control, 0.4Ω on-resistance, 2.5mA quiescent current, and 20µA shutdown current. It delivers regulated 5V output from 6V to 25V input for portable computers and battery-powered systems.
For engineers reviewing the LT1376CS8-5#TRPBF datasheet, LT1376CS8-5#TRPBF pinout, LT1376CS8-5#TRPBF application, or LT1376CS8-5#TRPBF equivalent, this page provides verified technical context, real-world load-current limits, BIAS pin efficiency benefits at high VIN, foldback protection behavior below 1V FB, and validated alternatives for 5V buck conversion in space-constrained industrial and portable designs.
Technical Context
The LT1376CS8-5#TRPBF implements constant-frequency current-mode control with internal 500kHz oscillator, cycle-by-cycle peak current limiting, and slope compensation to prevent subharmonic oscillation. Its bipolar NPN switch uses BOOST pin voltage (VIN + 5V) to achieve saturation, reducing conduction loss versus standard bipolar designs.
It features dual-threshold shutdown: 2.38V UVLO for undervoltage lockout and 0.4V full micropower shutdown. The BIAS pin (present only on LT1376 variants) enables output-sourced biasing to improve efficiency-e.g., >10% gain at VIN = 20V, VOUT = 5V, IOUT = 25mA-when connected to regulated 5V output.
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-directly constrains max continuous load current |
| Switching Frequency | 500kHz ±10% (440–570kHz over full –40°C to 125°C range)-enables compact 5–10µH inductors |
| Quiescent Supply Current | 2.5mA typical (VIN = 15V, no switching)-sets light-load efficiency floor |
| Shutdown Current | 20µA maximum (VIN ≤ 25V)-critical for battery runtime in standby |
| Input Voltage Range | 6V to 25V (minimum 5.5V guaranteed)-requires external PNP assist below 6V for startup |
| Efficiency | 87%+ typical at 1A, VIN = 10V, VOUT = 5V-enabled by BOOST-driven saturated switch and BIAS pin optimization |
Pinout & Package
LT1376CS8-5#TRPBF is housed in an 8-lead plastic SOIC (S8) package with θJA = 120–150°C/W depending on PCB layout. Thermal performance improves significantly with fused corner pins tied to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Supplies ~VIN + 5V to saturate internal NPN switch; enables 0.4Ω RON and >87% efficiency |
| VIN | Input power collector | Connects to input supply (6–25V); high di/dt node-requires local 100µF solid tantalum bypass |
| VSW | Switch emitter | Drives inductor; swings negative during off-time-must be clamped by external catch diode (e.g., 1N5818) |
| BIAS | Efficiency-optimizing bias source | When tied to 5V output, shifts internal bias current from VIN to VOUT-improves efficiency at high VIN/light load |
| VC | Error amplifier output / current limit setpoint | Compensation node (typ. 1–2V swing); drives peak current comparator-also supports external current clamp |
| FB/SENSE | Fixed 5V output sense | Direct connection to 5V output; triggers frequency foldback below 1V and current foldback below 1.7V during fault |
| GND | Power and feedback reference | Must tie directly to load ground point; sensitive to EMI from VSW-to-GND capacitance-short PCB trace required |
| SHDN | Two-threshold enable/disable | 2.38V = UVLO disable; 0.4V = full micropower shutdown-supports accurate input voltage sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and stable loop compensation without external type-II/III networks |
| BOOST-driven saturated switch | Reduces effective RON to 0.4Ω-cuts conduction loss vs. conventional bipolar regulators by >3× |
| BIAS pin operation | Allows >10% efficiency gain at VIN = 20V / VOUT = 5V by sourcing internal bias from output rail |
| Foldback protection | Automatically reduces switching frequency (5:1) and current limit when FB falls below 1V or 1.7V-limits power dissipation during short-circuit |
| Thermal shutdown & cycle-by-cycle current limit | Provides robust fault tolerance without external sensing-survives sustained overload and dead shorts |
Applications
| Portable Computer Power | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Regulating 5V rail from Li-ion (8.4–12.6V) or 9V alkaline stack in handheld test meters and data loggers. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC converter delivering 1.25A continuous 5V output with <20µA shutdown current. Use Value: Enables >100-hour battery life in sleep mode and maintains regulation across full battery discharge curve without external LDO post-regulation. |
Use Scenario: Powering microcontroller, ADC, and sensor interface in field-deployable environmental monitors. IC Role / Device Role / Timing Role: Fixed-output buck regulator with BIAS pin tied to 5V output to sustain >85% efficiency at 20V input and 10mA load. Use Value: Eliminates need for discrete bias resistor network and reduces thermal stress on PCB-critical for sealed enclosures. |
| Battery Charger Auxiliary Rail | Distributed Power for Industrial Sensors |
|
Use Scenario: Generating isolated 5V logic supply from 12–24V charger bus in multi-cell Li-ion charging systems. IC Role / Device Role / Timing Role: Compact 5V step-down stage upstream of opto-isolated gate drivers and charge management ICs. Use Value: 500kHz operation allows use of 5µH shielded inductor-reducing board area by 40% vs. 100kHz alternatives. |
Use Scenario: Providing 5V power to 4–20mA transmitter modules and RS-485 transceivers in factory automation nodes. IC Role / Device Role / Timing Role: Robust buck converter with thermal shutdown and foldback-operating continuously at 60°C ambient. Use Value: Sustains full 1.25A output at 75°C junction temperature without derating-verified per datasheet thermal curves. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5V buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#TRPBF | 4MHz synchronous buck; 1.2A output; integrated MOSFETs; requires external compensation | Higher frequency enables smaller LC filter but lacks BIAS pin efficiency boost at high VIN | Prefer for ultra-compact layouts where 4MHz ripple filtering is acceptable and VIN ≤ 15V |
| TPS54302DDAR | 3.5V–28V input; 3A output; adjustable VOUT; integrated high-side FET; 500kHz default | Higher current rating but fixed 5V version (TPS54302DDAR-5) not available-requires external resistor divider | Choose when >1.5A load headroom or programmable soft-start is required; accepts same 8-pin SO footprint |
Compared with LT1376CS8-5#TRPBF, LTC3605EDE-5#TRPBF offers higher integration and frequency but sacrifices BIAS-driven efficiency gains above 15V input, while TPS54302DDAR provides greater current headroom and flexibility at the cost of added external components and no built-in foldback protection.
Availability
LT1376CS8-5#TRPBF is available at Aetrix Electronics and suitable for portable computing, battery instrumentation, and distributed industrial power requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1376CS8-5#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 product support, datasheets, and application notes for the LT1376 family.
The LT1376 series was designed as a high-efficiency, thermally robust 5V buck solution for space-constrained portable and industrial systems-emphasizing low quiescent current, integrated protection, and simplified layout via BOOST and BIAS pins.
FAQ
What is the maximum continuous output current of the LT1376CS8-5#TRPBF?
The LT1376CS8-5#TRPBF delivers up to 1.25A continuous output at VOUT = 5V, VIN = 10V, and L = 10µH under typical conditions. Peak switch current is limited to 1.5A at ≤50% duty cycle, decreasing to 1.35A at 80% duty cycle. Actual load current depends on input voltage, inductor value, and thermal design-see Figure 15 in the datasheet for derating curves.
Does the LT1376CS8-5#TRPBF require an external feedback resistor divider?
No. The LT1376CS8-5#TRPBF is the fixed 5V version: internal resistor divider sets output voltage, and the FB pin functions as a SENSE pin directly connected to the 5V output. External resistors are only required for adjustable versions like LT1376CS8.
How does the BIAS pin improve efficiency in the LT1376CS8-5#TRPBF?
When the BIAS pin of the LT1376CS8-5#TRPBF is connected to the regulated 5V output, internal circuitry draws bias current from VOUT instead of VIN. This reduces total input-referred supply current-yielding >10% efficiency improvement at VIN = 20V, VOUT = 5V, and IOUT = 25mA per datasheet testing.
What happens when the FB/SENSE pin voltage drops below 1V in the LT1376CS8-5#TRPBF?
Below 1V, the LT1376CS8-5#TRPBF initiates frequency foldback-reducing switching frequency by up to 5:1-to limit power dissipation during short-circuit or severe overload. Simultaneously, below 1.7V, it reduces peak switch current limit to further constrain thermal stress on the IC and external components.
Can the LT1376CS8-5#TRPBF operate from a 5V input?
No. The absolute minimum input voltage for the LT1376CS8-5#TRPBF is 5.5V (guaranteed), with recommended operation starting at 6V. At VIN < 6V, the internal bias regulator cannot maintain stable reference and oscillator operation-external PNP assist circuitry is required for startup below this threshold.
LT1376CS8-5#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1376CS8-5#TRPBF FAQ
1.How can I place an order for LT1376CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376CS8-5#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 LT1376CS8-5#TRPBF reliable?
The price and inventory of LT1376CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1376CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376CS8-5#TRPBF?
LT1376CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376CS8-5#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 LT1376CS8-5#TRPBF?
For technical support, including LT1376CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376CS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1376CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1376CS8-5#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 LT1376CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1376CS8-5#TRPBF?
All LT1376CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376CS8-5#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 LT1376CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1376CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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