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Analog Devices Inc. LT1375IN8-5#PBF
- Part No.:
- LT1375IN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1375IN8-5#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,759
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Product details
Overview
LT1375IN8-5#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 protection circuitry. Designed for battery-powered systems and distributed power rails, it delivers up to 1.25A at 5V output with input voltage range 6V–25V.
For engineers reviewing the LT1375IN8-5#PBF datasheet, LT1375IN8-5#PBF pinout, LT1375IN8-5#PBF application, or LT1375IN8-5#PBF equivalent, key selection criteria include its fixed 5V output, 500kHz constant-frequency operation, cycle-by-cycle current limiting, 20µA shutdown current, and thermal shutdown - all validated for industrial temperature range (–40°C to 125°C).
Technical Context
The LT1375IN8-5#PBF implements current-mode control with an internal 500kHz oscillator and integrated 1.5A NPN power switch. Its architecture uses BOOST pin-driven saturation to achieve low conduction loss (0.4Ω typical), enabling >87% efficiency at full load. The fixed 5V output version eliminates external feedback resistors by embedding the voltage divider on-die, using the FB/SENSE pin as a direct output voltage sense node.
It features dual-threshold shutdown (0.4V full micropower disable, 2.38V UVLO), cycle-by-cycle current limiting, and thermal shutdown. Unlike the adjustable LT1375 variants, the -5 suffix denotes factory-trimmed 4.94–5.06V output accuracy over temperature and line, with no external compensation required for basic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.2%, guaranteed over –40°C to 125°C junction temperature and 6V–25V input. |
| Switching Frequency | 500 kHz ±10%, constant frequency enables predictable EMI filtering and small external LC components. |
| Max Output Current | 1.25 A continuous at VOUT = 5V, VIN = 10V, L = 10 µH; derates with higher VIN or lower inductance due to peak switch current limit. |
| Switch On Resistance | 0.4 Ω typical (saturated NPN), enabling high efficiency without external MOSFET drivers or gate charge pumps. |
| Shutdown Current | 20 µA max at VSHDN = 0V, supporting ultra-low-power battery hold-up and wake-on-event designs. |
| Input Voltage Range | 6 V to 25 V minimum operating range; absolute maximum 25 V - requires external clamp diode if transient exceeds rating. |
| Operating Temp Range | –40°C to +125°C junction temperature, qualified for industrial environments without derating. |
Pinout & Package
LT1375IN8-5#PBF is housed in an 8-pin plastic DIP (N8) package with through-hole mounting and θJA = 100°C/W. Pin functions are electrically identical to the SO-8 variant but optimized for prototyping and legacy PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BOOST | Boost capacitor drive node | Provides ~VIN+5V gate drive to saturate internal NPN switch; requires external 10nF–100nF capacitor and fast diode (e.g., 1N5818). |
| 2: VIN | Main power input | Supplies both internal bias circuitry and collector of on-chip NPN switch; must be bypassed with low-ESR 100µF solid tantalum near pin. |
| 3: VSW | Switch emitter node | Connects to inductor; swings negative during off-time - requires external catch diode clamped to GND. |
| 4: BIAS | Not connected (NC) on LT1375 series | Unused pin; left unconnected - distinct from LT1376 which uses BIAS for efficiency optimization. |
| 5: VC | Error amplifier output / current limit comparator input | Used for loop compensation (capacitor to GND); also serves as current clamp point - driving below 0.9V disables switching. |
| 6: FB/SENSE | Fixed-output voltage sense | Internally connected to 5V output; monitors regulation accuracy and triggers foldback protection if voltage drops below 1.7V. |
| 7: GND | Power and signal reference | Must tie directly to low-impedance ground plane; shared return path for switch current spikes and feedback reference. |
| 8: SHDN | Logic-level shutdown control | Active-low enable: <0.4V disables regulator (20µA IQ); >2.38V enables operation with UVLO behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz switching | Enables use of compact 5–10µH inductors and reduces output filter size vs. lower-frequency alternatives. |
| Saturating NPN switch (0.4Ω) | Achieves FET-like conduction loss without external driver, simplifying layout and improving light-load efficiency. |
| Integrated cycle-by-cycle current limit | Protects against short-circuit and overload without external sensing resistors - trip threshold fixed at 1.5A (≤50% duty cycle). |
| Dual-threshold shutdown | Combines precise 2.38V UVLO (prevents start-up below safe input) and 0.4V deep-sleep mode for <20µA quiescent draw. |
| Thermal shutdown with hysteresis | Shuts down at ~165°C junction and restarts at ~145°C, preventing thermal runaway in enclosed or high-ambient environments. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Powering 5V logic rails (USB peripherals, display controllers, sensor hubs) in laptops and tablets with Li-ion battery input (7–12.6V). IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated power with fast transient response to CPU/GPU load steps. Use Value: Delivers 1.25A at >87% efficiency across battery discharge curve, minimizing heat buildup and extending runtime. |
Use Scenario: Supplying 5V microcontroller, RF transceiver, and memory subsystems in handheld test equipment and portable medical devices. IC Role / Device Role / Timing Role: Main system regulator with shutdown control synchronized to host MCU sleep states. Use Value: 20µA shutdown current preserves battery life during extended idle periods without requiring external load switches. |
| Battery Charger Management | Distributed Power Architecture |
Use Scenario: Generating isolated 5V auxiliary supply for charger IC control logic and status LEDs in multi-cell Li-ion charging stations. IC Role / Device Role / Timing Role: Secondary regulation stage downstream of primary DC-DC or AC-DC converter. Use Value: Fixed 5V output eliminates feedback resistor tolerance errors; built-in UVLO prevents operation until main rail stabilizes. |
Use Scenario: Local point-of-load conversion in industrial PLC backplanes where 12–24V bus supplies multiple 5V sub-systems. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator mounted directly on daughter cards. Use Value: PDIP package allows through-hole mounting for mechanical stability; 125°C operation supports dense board layouts without forced air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#PBF | 4MHz synchronous buck, 3A output, 2.7–5.5V input - requires lower VIN and offers higher efficiency but no PDIP option. | Best for space-constrained, high-efficiency designs with stable low-voltage input; not suitable for 25V transients or through-hole assembly. | Select LTC3605EDE-5#PBF only when input is ≤5.5V and SMT-only assembly is acceptable. |
| LM2675MX-5.0/NOPB | 630kHz nonsynchronous buck, 1A output, 8–40V input - wider VIN range but lower current, no thermal shutdown, SO-8 only. | Acceptable for cost-sensitive 5V/1A applications with >8V input and no industrial temp requirement; lacks UVLO and foldback protection. | Choose LM2675MX-5.0/NOPB only for commercial-temp, non-critical 1A loads where BOM cost outweighs reliability features. |
Compared with LTC3605EDE-5#PBF and LM2675MX-5.0/NOPB, the LT1375IN8-5#PBF uniquely combines industrial temperature rating, through-hole PDIP packaging, integrated UVLO/foldback protection, and 1.25A capability at 5V - making it irreplaceable for ruggedized, maintainable, or legacy-compatible 5V buck applications.
Availability
LT1375IN8-5#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply across industrial temperature grades and long-term obsolescence management.
Supply support for LT1375IN8-5#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 LT1375 family. Linear pioneered high-frequency monolithic switching regulators with proprietary bipolar processes.
The LT1375 series was designed specifically for compact, efficient 5V buck conversion in portable and industrial systems where reliability, thermal robustness, and ease of layout outweigh raw efficiency metrics - emphasizing integrated protection and fixed-output simplicity.
FAQ
What is the guaranteed output voltage accuracy of the LT1375IN8-5#PBF over temperature and line?
The LT1375IN8-5#PBF guarantees 4.94 V to 5.06 V (±1.2%) output voltage across –40°C to +125°C junction temperature and 6 V to 25 V input voltage range. This specification is measured under full load and includes initial trim, line regulation (0.03%/V), and thermal drift - no external resistors affect accuracy since the feedback divider is internal.
Can the LT1375IN8-5#PBF operate with input voltage below 6V?
No - the LT1375IN8-5#PBF has a minimum specified input voltage of 6 V (per Absolute Maximum Ratings and Applications Information). Below this, internal bias lines may not regulate properly, causing oscillator frequency instability and potential loss of regulation. For 4.5–12V inputs, consider the functionally identical LT1507.
Does the LT1375IN8-5#PBF require external compensation components?
The LT1375IN8-5#PBF operates stably with minimal external components: only BOOST capacitor/diode, input/output capacitors, and inductor are mandatory. Compensation is internal for the fixed 5V version; the VC pin is used solely for optional loop shaping or current limiting override - no external RC network is required for basic operation.
How does the LT1375IN8-5#PBF protect against short-circuit conditions?
The LT1375IN8-5#PBF employs three coordinated protections: (1) cycle-by-cycle current limiting (1.5A peak switch current), (2) feedback pin foldback (reduces switching frequency and current limit when FB/SENSE <1.7V), and (3) thermal shutdown (>165°C). These act simultaneously to limit power dissipation in the IC, inductor, and catch diode during sustained faults.
Is the LT1375IN8-5#PBF pin-compatible with the LT1376IN8-5#PBF?
No - the LT1375IN8-5#PBF and LT1376IN8-5#PBF have different pinouts. The LT1375 uses pins 1–8 as BOOST/VIN/VSW/NC/VC/FB/SENSE/GND/SHDN, while the LT1376 substitutes BIAS for NC and omits SYNC. Substituting them without board revision will cause functional failure due to misrouted BOOST, BIAS, and SHDN signals.
LT1375IN8-5#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
LT1375IN8-5#PBF FAQ
1.How can I place an order for LT1375IN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375IN8-5#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 LT1375IN8-5#PBF reliable?
The price and inventory of LT1375IN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375IN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1375IN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375IN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375IN8-5#PBF?
LT1375IN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375IN8-5#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 LT1375IN8-5#PBF?
For technical support, including LT1375IN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375IN8-5#PBF requirements.
6.How does Aetrix verify that LT1375IN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1375IN8-5#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 LT1375IN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1375IN8-5#PBF?
All LT1375IN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375IN8-5#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 LT1375IN8-5#PBF part is unused and in its original packaging.
Return procedure for LT1375IN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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