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Analog Devices Inc. LT1376IN8-5#PBF
- Part No.:
- LT1376IN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1376IN8-5#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
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Product details
Overview
LT1376IN8-5#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.5A, 500kHz monolithic buck switching regulator in an 8-pin PDIP package. It integrates a saturated bipolar NPN power switch (0.4Ω typical RDS(on) equivalent), current-mode control loop, oscillator, and error amplifier. Designed for battery-powered systems and distributed power rails, it delivers up to 1.25A continuous output at 5V with input range 6V–25V.
For engineers reviewing the LT1376IN8-5#PBF datasheet, LT1376IN8-5#PBF pinout, LT1376IN8-5#PBF application, or LT1376IN8-5#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 LT1376IN8-5#PBF implements current-mode control with a 500kHz internal oscillator and dual feedback loops: one sensing switch current via an on-chip 0.05Ω sense resistor, the other regulating output voltage via the SENSE (FB) pin tied directly to the 5V output. Its BOOST pin enables saturation of the internal NPN switch by supplying ~5V above VIN, reducing conduction loss and enabling >87% efficiency.
It features two independent shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for full micropower shutdown. The BIAS pin-present only on LT1376 variants-allows sourcing internal bias current from VOUT, 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) |
| Max Output Current | 1.25A continuous at VIN ≥ 7.5V, L = 10µH; derates to 1.0A at VIN = 6V |
| Switching Frequency | 500kHz ±10% (constant, not load- or line-dependent) |
| Input Voltage Range | 6V to 25V (minimum 5.5V guaranteed for regulation) |
| Shutdown Current | 20µA typical (75µA max over full temperature range) |
| Switch On Resistance | 0.4Ω typical (enables low dropout and high efficiency at 1.5A peak) |
| Efficiency | 87% typical at VIN = 10V, VOUT = 5V, IOUT = 1.25A |
Pinout & Package
LT1376IN8-5#PBF uses an 8-pin plastic DIP (N8) package with 0.3" width and through-hole mounting. Thermal resistance θJA = 100°C/W. Pin functions are validated per Linear Technology's 13756fd datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Supplies ~VIN + 5V to saturate internal NPN switch; enables 0.4Ω effective RON |
| VIN | Power switch collector & IC supply | Connects to input source; high di/dt node requiring local bypass capacitor |
| VSW | Switch emitter output | Drives inductor; swings negative during off-time; clamped externally by catch diode |
| BIAS | Internal bias supply selector | When tied to VOUT, shifts bias current from VIN to VOUT, improving light-load efficiency |
| VC | Error amplifier output / current limit threshold | Used for compensation; voltage sets peak switch current; clamp range 0.9V–2.1V |
| FB/SENSE | Output voltage sense input | Fixed 5V version: connected directly to output; enables UVLO and foldback protection |
| GND | Analog and power ground reference | Must be shorted to load ground; critical for load regulation and EMI control |
| SHDN | Shutdown control input | Logic-compatible; 2.38V UVLO threshold, 0.4V full shutdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz switching frequency | Enables predictable EMI filtering and consistent external component sizing (e.g., 5–10µH inductors) |
| Saturating switch architecture | Reduces conduction loss vs. standard bipolar designs-efficiency improves from ~75% to >87% |
| BIAS pin for efficiency optimization | Shifts internal bias current from VIN to VOUT, yielding >10% efficiency gain at VIN = 20V, IOUT = 25mA |
| Cycle-by-cycle current limiting | Guarantees 1.5A peak switch current limit across temperature and line; prevents catastrophic failure under overload |
| Foldback protection on SENSE pin | Reduces switching frequency and current limit when output collapses below 1.7V, limiting fault power dissipation |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Point-of-load conversion from 12V or 19V adapter rails to 5V logic supply in compact notebooks. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering regulated power to USB controllers, I/O interfaces, and embedded microcontrollers. Use Value: Fixed 5V output eliminates external feedback resistors; 20µA shutdown current extends battery life during suspend states. |
Use Scenario: Power management in handheld test equipment operating from 2-cell Li-ion (6–8.4V) or 4-cell alkaline (6–10V) batteries. IC Role / Device Role / Timing Role: Main system regulator providing stable 5V rail for analog front-ends, ADCs, and low-power MCUs. Use Value: Wide 6–25V input range accommodates varying battery states; BIAS pin improves efficiency at partial charge (e.g., 7.2V → 5V @ 100mA). |
| Battery Charger Supervision | Distributed Power Architecture |
Use Scenario: Auxiliary 5V supply for charger controller ICs and status LEDs in multi-bay smart chargers. IC Role / Device Role / Timing Role: Secondary regulator deriving clean 5V from main DC bus (e.g., 12V or 24V) to isolate charger logic from charging path noise. Use Value: Current-mode control ensures fast transient response to dynamic load steps from LED indicators or communication bursts. |
Use Scenario: Local 5V generation at board edges or modules in telecom or industrial backplanes with 12V or 24V intermediate distribution buses. IC Role / Device Role / Timing Role: Compact, self-contained buck converter eliminating need for remote DC/DC modules or large discrete solutions. Use Value: 8-pin PDIP package allows through-hole mounting for high-reliability mechanical retention; 500kHz operation minimizes filter footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376CS8-5#PBF | Same electrical specs, but in 8-lead SOIC (S8) package; θJA = 120–150°C/W depending on PCB layout | Surface-mount assembly; requires thermal pad or copper pour for equivalent thermal performance | Select for automated PCB assembly; verify thermal design with 120°C/W worst-case θJA |
| LM2678-5.0 | 5V fixed-output buck; 63kHz switching frequency; 5A max output; no BIAS pin; higher quiescent current (50mA) | Higher power delivery; lower switching frequency increases inductor size; less suitable for portable/battery use | Select when >1.5A output or cost-sensitive industrial applications outweigh efficiency and size requirements |
Compared with LT1376IN8-5#PBF, the LT1376CS8-5#PBF offers identical regulation performance in a surface-mount package but demands careful thermal layout, while the LM2678-5.0 trades 500kHz compactness and 20µA shutdown for higher current and lower cost in non-portable systems.
Availability
LT1376IN8-5#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, long-term obsolescence management, and lead-free compliance.
Supply support for LT1376IN8-5#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 legacy Linear power products.
The LT1376 series belongs to Linear's monolithic current-mode buck regulator product line, designed specifically for high-efficiency, compact, and robust DC/DC conversion in space-constrained and battery-sensitive applications.
FAQ
What is the minimum input voltage required for LT1376IN8-5#PBF to regulate 5V output?
The LT1376IN8-5#PBF guarantees regulation down to 5.5V input (typical start-up at 5.0V), but stable operation at full 1.25A load requires ≥6V per the datasheet's "Minimum Input Voltage" graph. Below 6V, maximum load current drops significantly due to reduced duty cycle headroom and switch current derating. For 6V–25V input, the LT1376IN8-5#PBF maintains 5V ±1.2% output with proper external components.
Does LT1376IN8-5#PBF require an external feedback resistor network?
No. The LT1376IN8-5#PBF is the fixed 5V version: internal resistor divider sets the reference, and the FB pin functions as a SENSE input directly connected to the 5V output. External resistors are unnecessary-only the BOOST capacitor, catch diode, inductor, and input/output capacitors are required. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy.
How does the BIAS pin improve efficiency in LT1376IN8-5#PBF?
The BIAS pin on LT1376IN8-5#PBF allows routing the internal bias current from VIN to VOUT. When tied to the 5V output, it reduces total input-referred quiescent current-especially beneficial at high VIN (e.g., 20V) and light loads (e.g., 25mA), where efficiency improves by >10%. This feature is absent in LT1375 variants and unique to LT1376-family regulators.
Can LT1376IN8-5#PBF synchronize to an external clock?
No. External synchronization is supported only on the LT1375 variant via its SYNC pin. The LT1376IN8-5#PBF lacks a SYNC pin and operates exclusively at its internal 500kHz oscillator frequency. Its block diagram and pinout confirm no synchronization capability-designs requiring clock alignment must select LT1375-based alternatives or add external timing circuitry.
What thermal considerations apply to LT1376IN8-5#PBF in 8-pin PDIP package?
The LT1376IN8-5#PBF in N8 package has θJA = 100°C/W. To maintain junction temperature <125°C at 1.25A output, ambient must stay ≤75°C with adequate copper area (≥1 in²) under the IC. Via stitching from the GND pin to an internal ground plane is strongly recommended. Derate output current if ambient exceeds 60°C or PCB copper is minimal.
LT1376IN8-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1376IN8-5#PBF FAQ
1.How can I place an order for LT1376IN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376IN8-5#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 LT1376IN8-5#PBF reliable?
The price and inventory of LT1376IN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376IN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1376IN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376IN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376IN8-5#PBF?
LT1376IN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376IN8-5#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 LT1376IN8-5#PBF?
For technical support, including LT1376IN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376IN8-5#PBF requirements.
6.How does Aetrix verify that LT1376IN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1376IN8-5#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 LT1376IN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1376IN8-5#PBF?
All LT1376IN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376IN8-5#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 LT1376IN8-5#PBF part is unused and in its original packaging.
Return procedure for LT1376IN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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