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Analog Devices Inc. LT1375CN8-5#PBF
- Part No.:
- LT1375CN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1375CN8-5#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,601
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Product details
Overview
LT1375CN8-5#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 bipolar NPN power switch with current-mode control, 0.4Ω typical on-resistance, 2.5mA quiescent current, and cycle-by-cycle current limiting. It delivers regulated 5V output from 6V–25V input for battery-powered systems and portable computers.
For engineers reviewing the LT1375CN8-5#PBF datasheet, LT1375CN8-5#PBF pinout, LT1375CN8-5#PBF application, or LT1375CN8-5#PBF equivalent, key selection criteria include its fixed 5V output, 500kHz constant-frequency operation, thermal shutdown, undervoltage lockout at 2.38V, and compatibility with standard surface-mount inductors as small as 5µH.
Technical Context
The LT1375CN8-5#PBF employs current-mode control architecture with an internal 500kHz oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the VC pin. Its fixed-output variant uses internal feedback divider (SENSE pin tied to VOUT), eliminating external resistors.
It features dual-threshold shutdown: 2.38V for UVLO standby mode and 0.4V for full micropower shutdown (20µA). The BOOST pin enables saturation of the integrated NPN switch via external capacitor/diode, reducing conduction loss and enabling >87% efficiency at light-to-moderate loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (guaranteed over temperature and line) |
| Switching Frequency | 500kHz ±10% - enables compact 5µH inductor and low-profile design |
| Max Output Current | 1.5A at ≤50% duty cycle; derates to 1.35A at 80% duty cycle - constrains min input voltage for 5V output |
| Switch On-Resistance | 0.4Ω typ - reduces conduction loss vs. conventional bipolar regulators |
| Quiescent Supply Current | 2.5mA typ - supports efficient operation in battery-powered standby modes |
| Shutdown Current | 20µA max - enables ultra-low-power system sleep states |
| Input Voltage Range | 6V to 25V - excludes startup below 5.5V; requires external PNP assist for <6V start |
Pinout & Package
LT1375CN8-5#PBF is housed in an 8-pin plastic DIP (N8) package with through-hole mounting and θJA = 100°C/W. Pin functions are validated per Linear Technology LTC document 13756fd.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive | Provides >VIN voltage to saturate internal NPN switch; enables 0.4Ω RON |
| VIN | Input power collector | Supplies internal circuitry and powers switch collector; high di/dt node requiring local bypass |
| VSW | Switch emitter | Connects to inductor; swings negative during off-time - requires catch diode clamping |
| BIAS | Not connected (NC) | Unused in LT1375 family; LT1376 only - no internal connection in LT1375CN8-5#PBF |
| VC | Error amplifier output | Controls peak switch current; used for compensation or external override |
| FB/SENSE | Feedback / output sense | Fixed 5V version ties this pin directly to output; enables 2.42V reference sensing |
| GND | Power and signal reference | Must be shorted to load ground to avoid load regulation error; carries high-frequency spikes |
| SHDN | Shutdown control | Logic-compatible input: 0V = shutdown (20µA), 2.38V = UVLO disable, >2.5V = active |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz switching frequency | Enables predictable EMI filtering and consistent inductor sizing across designs |
| Saturating switch architecture | Reduces effective RON to 0.4Ω, improving efficiency by >12% vs. non-boosted bipolar regulators |
| Cycle-by-cycle current limiting | Guarantees 1.5A peak switch current limit under all conditions, including short-circuit |
| Dual-threshold shutdown | 2.38V UVLO prevents operation until input stabilizes; 0.4V deep shutdown cuts supply current to 20µA |
| Thermal shutdown protection | Prevents damage during sustained overload or poor heatsinking; auto-recovery on cooldown |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Main 5V rail generation from Li-ion or multi-cell alkaline battery packs (6–25V). IC Role / Device Role / Timing Role: Primary step-down DC/DC converter delivering regulated 5V at up to 1.5A. Use Value: Enables compact, high-efficiency power conversion without external feedback resistors due to fixed 5V configuration. |
Use Scenario: Power management in handheld test equipment, medical monitors, and portable data loggers. IC Role / Device Role / Timing Role: System-level 5V supply with low quiescent current and robust short-circuit foldback. Use Value: 20µA shutdown current extends battery life; frequency foldback below 1V FB prevents thermal runaway during faults. |
| Battery Chargers | Distributed Power |
Use Scenario: Auxiliary 5V supply for charger controller ICs and status LEDs in multi-bay chargers. IC Role / Device Role / Timing Role: Isolated secondary-side 5V regulator powered from intermediate bus (e.g., 12V or 24V). Use Value: Tolerates wide input range (6–25V) and maintains regulation during input transients common in charger AC/DC stages. |
Use Scenario: Local point-of-load regulation in industrial PLC I/O modules or telecom line cards. IC Role / Device Role / Timing Role: Compact, thermally robust 5V buck converter replacing larger discrete solutions. Use Value: Integrated thermal shutdown and current limiting eliminate need for external protection circuitry. |
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, 2.5V–5.5V input, QFN-12 | Higher frequency, lower input range, no BOOST pin - unsuitable for >6V input without pre-regulation | Select when board space is critical and input is ≤5.5V; not drop-in for LT1375CN8-5#PBF's 6–25V range |
| LM2675N-5.0 | 63kHz buck, 1A, 8V–40V input, 8-pin PDIP, no current-mode control | Lower frequency (requires larger inductor), lower current rating, slower transient response | Acceptable for cost-sensitive, non-portable 5V supplies where size and efficiency are secondary |
Compared with LT1375CN8-5#PBF, LTC3605EDE-5#PBF offers higher integration and efficiency at low input voltages but cannot replace it above 5.5V; LM2675N-5.0 provides legacy compatibility and wider input range but sacrifices switching speed, current capability, and transient performance.
Availability
LT1375CN8-5#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power applications requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.
Supply support for LT1375CN8-5#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 LT1375 series was designed specifically for compact, high-efficiency 5V/3.3V step-down conversion in space-constrained portable and battery-operated equipment.
FAQ
What is the minimum input voltage required for LT1375CN8-5#PBF to start regulation?
The LT1375CN8-5#PBF requires a minimum input voltage of 5.5V to initiate regulation, as guaranteed by internal bias line stability tests. Below 6V, startup may be unreliable without an external PNP assist circuit. Once running, it sustains regulation down to ~5.0V depending on load and temperature, per the datasheet's "Minimum Input Voltage" graph (Figure G12).
Does LT1375CN8-5#PBF require an external BOOST capacitor?
Yes, LT1375CN8-5#PBF requires an external BOOST capacitor (typically 10nF–100nF ceramic) connected between BOOST and SW pins. This capacitor enables the internal NPN switch to saturate, achieving the specified 0.4Ω on-resistance and >87% efficiency. Omitting it degrades efficiency and increases thermal stress.
Can LT1375CN8-5#PBF synchronize to an external clock?
No, LT1375CN8-5#PBF does not support external synchronization. Only the LT1375 (non-"-5") variants include a SYNC pin. The LT1375CN8-5#PBF is a fixed-frequency part with internal 500kHz oscillator and no synchronization capability.
What is the function of the FB/SENSE pin on LT1375CN8-5#PBF?
On LT1375CN8-5#PBF, the FB/SENSE pin serves as a direct output voltage sense node - it is internally connected to the 5V regulator output. Unlike adjustable versions, no external resistor divider is needed. It also enables fault protection: voltage below 1.7V reduces current limit, and below 1V reduces switching frequency to manage power dissipation during shorts.
Is thermal shutdown implemented in LT1375CN8-5#PBF?
Yes, LT1375CN8-5#PBF includes fully integrated thermal shutdown. When junction temperature exceeds ~165°C, the device disables switching and enters thermal shutdown. Operation resumes automatically once the die cools below the hysteresis threshold (~145°C), protecting against permanent damage during sustained overload or inadequate heatsinking.
LT1375CN8-5#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1375CN8-5#PBF FAQ
1.How can I place an order for LT1375CN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375CN8-5#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 LT1375CN8-5#PBF reliable?
The price and inventory of LT1375CN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375CN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1375CN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375CN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375CN8-5#PBF?
LT1375CN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375CN8-5#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 LT1375CN8-5#PBF?
For technical support, including LT1375CN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375CN8-5#PBF requirements.
6.How does Aetrix verify that LT1375CN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1375CN8-5#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 LT1375CN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1375CN8-5#PBF?
All LT1375CN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375CN8-5#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 LT1375CN8-5#PBF part is unused and in its original packaging.
Return procedure for LT1375CN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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