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Analog Devices Inc. LT1376CS8-5#PBF
- Part No.:
- LT1376CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376CS8-5#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:881
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Product details
Overview
LT1376CS8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.5A, 500kHz monolithic buck switching regulator in an 8-pin SOIC package. It integrates a saturated bipolar NPN power switch (0.4Ω on-resistance), current-mode control loop, and internal feedback divider. Designed for battery-powered systems and distributed power rails, it delivers up to 1.25A at 5V with input voltage range 6V to 25V.
For engineers reviewing the LT1376CS8-5#PBF datasheet, LT1376CS8-5#PBF pinout, LT1376CS8-5#PBF application, or LT1376CS8-5#PBF equivalent, key selection criteria include its fixed 5V output, 500kHz constant-frequency operation, cycle-by-cycle current limiting, 20µA shutdown current, and BIAS pin efficiency optimization for high VIN/low IOUT conditions.
Technical Context
The LT1376CS8-5#PBF implements current-mode control with a 500kHz oscillator and dual-loop regulation: an error amplifier sets the peak switch current threshold via the VC pin, while a current-sense amplifier monitors switch emitter current on a cycle-by-cycle basis. Its saturated bipolar switch architecture-enabled by the BOOST pin-achieves 0.4Ω effective on-resistance and >87% efficiency at full load.
It features two independent shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for micropower shutdown, plus FB/SENSE pin functionality that enables foldback current limiting (<1.7V) and frequency reduction (<1V) during overload or short-circuit events. The BIAS pin (LT1376-specific) allows internal circuitry to draw 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 |
| Switching Frequency | 500kHz ±10% (constant, not load- or line-dependent) |
| Shutdown Current | 20µA typical (measured at VSHDN = 0V, VIN ≤ 25V) |
| Supply Current (Active) | 2.5mA typical (effective input-referred quiescent current) |
| Input Voltage Range | 6V to 25V (minimum 5.5V guaranteed for regulation) |
| Package Thermal Resistance | θJA = 120–150°C/W depending on PCB layout (SO-8) |
Pinout & Package
LT1376CS8-5#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad thermal enhancement. Pin functions are validated per Linear Technology's official 13756fd datasheet and confirmed on Analog Devices' product page.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides voltage >VIN to saturate internal NPN switch; enables 0.4Ω RON and >87% efficiency |
| VIN | Power switch collector & IC supply input | Supplies internal bias circuitry; high di/dt node requiring local bypass capacitor placement |
| VSW | Switch emitter output | Drives inductor; swings negative during off-time-requires external catch diode clamping |
| BIAS | Efficiency-optimizing bias supply | When tied to VOUT ≥3.3V, shifts internal bias current from VIN to VOUT, reducing input current by >10% |
| VC | Error amplifier output / current limit setpoint | Controls peak switch current; used for loop compensation; clamp range 0.9V–2.1V |
| FB/SENSE | Fixed-output sense input | Connected directly to 5V output; triggers foldback current limit below 1.7V and frequency reduction below 1V |
| GND | Power and signal reference | Must be low-impedance path to load ground; carries narrow EMI spikes from VSW-to-GND capacitance |
| SHDN | Enable/disable control | Two-threshold logic: 2.38V UVLO, 0.4V deep shutdown; sinks current when active low |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz switching frequency | Enables predictable EMI filtering and consistent inductor sizing; immune to load/line variation |
| Saturating bipolar switch with BOOST pin | Achieves 0.4Ω effective on-resistance-comparable to low-RDS(on) MOSFETs but with smaller die area |
| BIAS pin for efficiency optimization | Reduces total input-referred quiescent current by >10% at high VIN/low IOUT (e.g., 20V→5V/25mA) |
| Cycle-by-cycle current limiting | Guarantees 1.5A peak switch current limit under all conditions; prevents runaway during overload |
| Foldback protection on FB/SENSE pin | Automatically reduces switch current limit (<1.7V) and switching frequency (<1V) during short-circuit events |
Applications
| Battery-Powered Portable Computers | Distributed DC Power Supply |
|---|---|
|
Use Scenario: Main 5V rail generation in laptops or handheld instruments powered by 7.2–24V Li-ion packs. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V at up to 1.25A with tight transient response. Use Value: 20µA shutdown current extends battery life in sleep mode; BIAS pin improves light-load efficiency by >10%. |
Use Scenario: Local point-of-load (POL) conversion in industrial backplanes or telecom shelves with 12–24V intermediate bus. IC Role / Device Role / Timing Role: Fixed-output step-down regulator powering microcontrollers, sensors, and interface ICs. Use Value: 500kHz operation allows use of compact 5–10µH inductors; cycle-by-cycle current limiting ensures robustness against downstream faults. |
| Battery Charger Auxiliary Rail | Industrial Embedded Control Module |
|
Use Scenario: Generating isolated 5V auxiliary supply for charger management ICs and status LEDs from main battery input. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator with integrated feedback network and UVLO. Use Value: Fixed 5V output eliminates external resistor divider; 2.38V UVLO prevents startup until battery reaches safe voltage threshold. |
Use Scenario: Powering FPGA I/O banks, ADC references, and CAN transceivers in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: High-reliability 5V POL regulator operating across –40°C to +125°C junction temperature range. Use Value: Guaranteed 1.5A current limit and thermal shutdown protect against sustained overloads in unattended operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#PBF | 4MHz synchronous buck, 3A output, integrated MOSFETs, no BOOST/BIA pins | Higher efficiency at light loads; requires different magnetics and layout; lacks foldback protection | Choose for higher density and lower quiescent current; avoid if legacy 500kHz EMI filter or BIAS-driven efficiency is required. |
| TPS54302DDAR | 3A synchronous buck, 500kHz, integrated FETs, adjustable output only (no fixed-5V variant) | Requires external feedback resistors; no dedicated BIAS pin; higher minimum input voltage (4.5V) | Choose for higher output current and synchronous rectification; avoid if fixed 5V output and BIAS-assisted efficiency are mandatory. |
Compared with LTC3605EDE-5#PBF and TPS54302DDAR, the LT1376CS8-5#PBF offers unique BIAS pin efficiency optimization and analog foldback protection-critical for battery longevity and fault tolerance-but trades off synchronous rectification and higher current capability.
Availability
LT1376CS8-5#PBF is available at Aetrix Electronics and suitable for battery-powered portable computers, distributed DC power supplies, battery charger auxiliary rails, and industrial embedded control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1376CS8-5#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 LT1376 family. Linear pioneered high-frequency monolithic switching regulators using proprietary bipolar processes.
The LT1376 belongs to Linear's legacy high-efficiency buck regulator product line, designed specifically for space-constrained, battery-sensitive applications where fixed-output simplicity, low shutdown current, and robust overload protection are prioritized over synchronous topology.
FAQ
What is the maximum continuous output current of the LT1376CS8-5#PBF?
The LT1376CS8-5#PBF delivers up to 1.25A continuous output current at 5V with VIN = 10V and L = 10µH, as specified in the Typical Application Circuit. Peak switch current is limited to 1.5A at ≤50% duty cycle, decreasing to 1.35A at 80% duty cycle due to internal slope compensation. Actual achievable load current depends on input voltage, inductor value, and thermal design.
Does the LT1376CS8-5#PBF require an external feedback resistor divider?
No-the LT1376CS8-5#PBF is the fixed 5V version and contains internal feedback resistors. Its FB pin functions as a SENSE input and must be connected directly to the 5V output. External dividers are only required for adjustable-output variants like the LT1376CS8.
How does the BIAS pin improve efficiency in the LT1376CS8-5#PBF?
The BIAS pin on the LT1376CS8-5#PBF allows internal circuitry to draw operating current from the regulated 5V output instead of the higher input voltage. At VIN = 20V, VOUT = 5V, and IOUT = 25mA, this reduces total input-referred quiescent current by over 10%, directly extending battery runtime in light-load conditions.
What protection features does the LT1376CS8-5#PBF include?
The LT1376CS8-5#PBF includes cycle-by-cycle current limiting (1.5A peak), thermal shutdown, undervoltage lockout (2.38V), deep shutdown (0.4V), and FB/SENSE pin-based foldback: current limit reduction below 1.7V and frequency reduction below 1V during overload or short-circuit events-enabling safe continuous fault operation.
Can the LT1376CS8-5#PBF be synchronized to an external clock?
No-the LT1376CS8-5#PBF does not support external synchronization. Only the LT1375 variants (e.g., LT1375CS8) include a SYNC pin. The LT1376CS8-5#PBF operates at a fixed 500kHz internal oscillator frequency with ±10% tolerance across temperature and line.
LT1376CS8-5#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:
- 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#PBF FAQ
1.How can I place an order for LT1376CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376CS8-5#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 LT1376CS8-5#PBF reliable?
The price and inventory of LT1376CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1376CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376CS8-5#PBF?
LT1376CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376CS8-5#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 LT1376CS8-5#PBF?
For technical support, including LT1376CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376CS8-5#PBF requirements.
6.How does Aetrix verify that LT1376CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1376CS8-5#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 LT1376CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1376CS8-5#PBF?
All LT1376CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376CS8-5#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 LT1376CS8-5#PBF part is unused and in its original packaging.
Return procedure for LT1376CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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