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Analog Devices Inc. LT1376CS8#PBF
- Part No.:
- LT1376CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376CS8#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,382
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Product details
Overview
LT1376CS8#PBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck 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 LT1376CS8#PBF datasheet, LT1376CS8#PBF pinout, LT1376CS8#PBF application, or LT1376CS8#PBF equivalent, key selection criteria include its fixed 5V output configuration, SO-8 package thermal performance (θJA = 120–150°C/W), BOOST pin drive requirement for switch saturation, BIAS pin efficiency optimization (LT1376 only), and guaranteed 500kHz ±60kHz switching frequency across temperature.
Technical Context
The LT1376CS8#PBF implements constant-frequency current-mode control using an internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the VC pin. Its bipolar NPN switch is driven via the BOOST pin to achieve low 0.4Ω on-resistance and >87% efficiency - enabled by external boost capacitor and catch diode.
It integrates undervoltage lockout (2.38V SHDN threshold), thermal shutdown, and dual-foldback protection: FB pin voltage below 1.7V reduces current limit; below 1.0V reduces switching frequency ~5:1. The BIAS pin (LT1376-specific) allows sourcing internal bias from VOUT, improving efficiency at high VIN/light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (guaranteed over full temp range) |
| Switch Current Limit | 1.5A at ≤50% duty cycle; derates to 1.35A at 80% duty cycle |
| Switching Frequency | 500kHz typical (440–570kHz over –40°C to 125°C junction) |
| Quiescent Supply Current | 2.5mA typical at VIN = 15V (input-referred, includes BIAS path) |
| Shutdown Current | 20µA typical (75µA max over full temp range) |
| Input Voltage Range | 6V to 25V (minimum 5.0V guaranteed; operation below 7.5V has restrictions) |
| Package Thermal Resistance | θJA = 120–150°C/W depending on PCB layout (SO-8) |
Pinout & Package
LT1376CS8#PBF is housed in an 8-pin plastic SO (S8) package with exposed pad not electrically connected. Thermal performance depends on PCB copper area and solder land design per Linear's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides voltage > VIN to saturate internal NPN switch; enables 0.4Ω RON and high efficiency |
| VIN | Input supply and switch collector | Supplies internal circuitry and powers switch; requires low-inductance bypass near pin |
| VSW | Switch emitter | Connects to inductor; swings negative during off-time; clamped by external catch diode |
| BIAS | Efficiency-optimizing bias supply | When tied to VOUT, shifts internal bias current from VIN to VOUT, improving efficiency at high VIN/light load |
| VC | Error amplifier output / current limit setpoint | Controls peak switch current; used for loop compensation; clamp levels at 0.9V (low) and 2.1V (high) |
| FB/SENSE | Feedback reference / output voltage sense | Fixed 5V version uses internal divider; SENSE pin connects directly to 5V output for regulation and foldback protection |
| GND | Analog and power ground reference | Must be short, low-impedance path to load ground; carries fast EMI spikes from VSW–GND capacitance |
| SHDN | Shutdown control with UVLO | 2.38V threshold disables switching (UVLO); 0.4V threshold forces micropower shutdown (20µA IQ) |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and stable loop compensation without external slope compensation |
| Integrated BOOST drive | Eliminates need for external gate driver; achieves FET-like 0.4Ω switch RON with bipolar process |
| Dual-foldback protection | Reduces both switch current limit (at FB < 1.7V) and switching frequency (at FB < 1.0V) during overload/short-circuit |
| BIAS pin efficiency mode | Improves efficiency >10% at VIN = 20V, VOUT = 5V, IOUT = 25mA by sourcing bias from regulated output |
| Robust thermal & fault protection | Includes full-cycle current limiting, thermal shutdown, and undervoltage lockout with hysteresis |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Main 5V rail generation in compact notebooks or handheld PCs with wide-input battery packs (e.g., 2-cell Li-ion + boost). IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering regulated 5V at up to 1.25A with minimal external components. Use Value: Enables use of small 5µH inductors and all-SMT layout; 2.5mA quiescent current extends battery runtime in sleep modes. |
Use Scenario: Power management in portable test equipment or IoT edge nodes powered by 9–24V industrial batteries. IC Role / Device Role / Timing Role: Fixed-output DC/DC step-down regulator providing clean 5V for microcontrollers, sensors, and RF modules. Use Value: Dual-foldback protection ensures safe operation during accidental shorts; shutdown current <75µA supports long-term storage. |
| Battery Charger Auxiliary Rail | Distributed Power Architecture |
Use Scenario: Generating isolated 5V auxiliary supply for charger control logic and status LEDs in multi-bay smart chargers. IC Role / Device Role / Timing Role: Secondary buck regulator fed from intermediate bus (e.g., 12V or 24V), independent of main charging path. Use Value: SO-8 package fits tight board spaces; BIAS pin improves efficiency when VIN ≫ VOUT, reducing heat in enclosed enclosures. |
Use Scenario: Local point-of-load (POL) conversion in telecom or industrial backplanes where 5V logic rails are distributed from higher-voltage buses. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator placed near FPGA or ASIC loads to minimize IR drop and noise. Use Value: Guaranteed 500kHz operation simplifies EMI filter design; thermal shutdown prevents failure under sustained overload in unventilated chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376IS8#PBF | Same functionality, extended –40°C to 125°C operating range; identical pinout and electrical specs | Required for automotive or industrial environments with wider ambient temperature swings | Select LT1376IS8#PBF when operation below –40°C or above 85°C ambient is required; otherwise LT1376CS8#PBF suffices for commercial-grade designs. |
| LT1507CS8#PBF | Functionally identical 5V buck regulator but rated for 4.5V–12V input (vs. 6V–25V); same SO-8 package and pinout | Suitable only for low-input applications (e.g., single 5V USB source or 3.3V–5V intermediate bus) | Choose LT1507CS8#PBF only if input never exceeds 12V and minimum input is ≥4.5V; LT1376CS8#PBF remains necessary for 6–25V universal input. |
Compared with LT1376IS8#PBF, the LT1376CS8#PBF offers lower cost and sufficient performance for 0°C–70°C ambient applications, while LT1507CS8#PBF trades input voltage range for optimized low-VIN efficiency - neither is pin-compatible replacement for LT1376CS8#PBF outside their specified input bounds.
Availability
LT1376CS8#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, lead-free compliance, and long-lifecycle support.
Supply support for LT1376CS8#PBF 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 line, known for high-performance analog and power management ICs.
The LT1376 belongs to Linear's monolithic buck regulator family designed for space-constrained, efficiency-critical DC/DC conversion in portable and industrial systems - emphasizing integration, thermal robustness, and protection integrity.
FAQ
What is the maximum continuous output current of the LT1376CS8#PBF?
The LT1376CS8#PBF delivers up to 1.25A at 5V output under typical conditions (VIN = 10V, L = 10µH). Maximum switch current is 1.5A at ≤50% duty cycle, derating to 1.35A at 80% duty cycle. Actual load current depends on input voltage, inductor value, and thermal design - e.g., at VIN = 25V and L = 5µH, continuous output is reduced due to higher ripple current and thermal limits. Full derating curves are provided in the LT1375/LT1376 datasheet Figure G15.
Does the LT1376CS8#PBF require an external boost capacitor, and why?
Yes, the LT1376CS8#PBF requires an external boost capacitor (typically 10nF–100nF ceramic) between BOOST and VSW pins. This capacitor provides a voltage higher than VIN to fully saturate the internal NPN power switch, reducing its on-resistance to 0.4Ω and enabling >87% efficiency. Without it, switch losses increase significantly, degrading efficiency and thermal performance. The BOOST pin must also connect to a Schottky diode (e.g., 1N5818) from VIN to BOOST.
How does the BIAS pin improve efficiency in the LT1376CS8#PBF?
The BIAS pin on the LT1376CS8#PBF allows internal bias circuitry to draw operating current from the regulated 5V output instead of the higher input voltage. When BIAS is tied to VOUT, efficiency improves by >10% at VIN = 20V, VOUT = 5V, and light loads (e.g., 25mA), because power dissipation scales with (VIN − VOUT) × IBias. This feature is unique to the LT1376 (not present in LT1375) and requires VOUT ≥ 3.3V to function.
What protection features does the LT1376CS8#PBF include?
The LT1376CS8#PBF integrates cycle-by-cycle current limiting, thermal shutdown, and dual-foldback protection triggered by the FB/SENSE pin: current limit reduces when FB voltage falls below 1.7V, and switching frequency drops ~5:1 when FB falls below 1.0V - both critical for safe short-circuit operation. It also includes undervoltage lockout (2.38V SHDN threshold) and micropower shutdown (0.4V threshold, 20µA IQ). No external components are needed to enable these protections.
Is the LT1376CS8#PBF pin-compatible with other members of the LT1375/LT1376 family?
Yes, the LT1376CS8#PBF shares identical SO-8 pinout and footprint with all LT1375/LT1376 variants in S8 package (e.g., LT1375CS8#PBF, LT1376IS8#PBF). However, functional differences exist: LT1375 lacks BIAS pin functionality and includes SYNC pin instead; fixed-output (-5) versions use FB as SENSE, while adjustable versions require external resistor dividers. Always verify schematic connectivity - especially BIAS/SYNC/FB routing - before substitution.
LT1376CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 8-SO
LT1376CS8#PBF FAQ
1.How can I place an order for LT1376CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376CS8#PBF 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#PBF reliable?
The price and inventory of LT1376CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1376CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376CS8#PBF?
LT1376CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376CS8#PBF 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#PBF?
For technical support, including LT1376CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376CS8#PBF requirements.
6.How does Aetrix verify that LT1376CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1376CS8#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LT1376CS8#PBF?
All LT1376CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376CS8#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LT1376CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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