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Analog Devices Inc. LT1375CS8-5#PBF
- Part No.:
- LT1375CS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375CS8-5#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:147
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Product details
Overview
LT1375CS8-5#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 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 at 5V with input voltage range 6V–25V.
For engineers reviewing the LT1375CS8-5#PBF datasheet, LT1375CS8-5#PBF pinout, LT1375CS8-5#PBF application, or LT1375CS8-5#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 protection - all critical for portable computing and low-quiescent-power DC/DC conversion.
Technical Context
The LT1375CS8-5#PBF implements current-mode control with an internal 500kHz oscillator and cycle-by-cycle peak current limiting. Its bipolar NPN switch is driven via an external BOOST capacitor to achieve saturation, reducing conduction loss to ~0.4Ω and enabling >87% efficiency at full load.
It features dual shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for micropower shutdown, plus feedback pin foldback (frequency and current limit reduction below 1.7V FB voltage) for short-circuit robustness. The fixed 5V version uses internal resistor divider; FB pin functions as SENSE connected directly to output.
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 - constrains max continuous output current |
| Switching Frequency | 500kHz ±10% (440–570kHz over full temp range) - enables compact 5–10µH inductors |
| Shutdown Current | 20µA typical (≤75µA over temp) - supports long battery life in standby |
| Input Voltage Range | 6V to 25V (min 5.5V guaranteed start-up) - suitable for 12V rail and wide-input industrial supplies |
| Efficiency | ≥87% at 1A, VIN=10V, VOUT=5V - achieved via BOOST-driven saturated switch and optimized bias architecture |
| Thermal Resistance θJA | 120–150°C/W depending on PCB layout - requires thermal pad or ground plane for full 1.5A operation |
Pinout & Package
LT1375CS8-5#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed thermal pad (not electrically connected). Pin 1 is marked with dot; pin numbering follows standard SOIC convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides ~VIN+5V gate drive to saturate internal NPN switch; must be connected to external diode/capacitor network |
| VIN | Main input supply and switch collector | Supplies internal circuitry and powers switch; high di/dt node - requires local 100µF solid tantalum bypass |
| VSW | Switch emitter output | Drives inductor; swings negative during off-time - requires external catch diode (e.g., 1N5818) clamped to GND |
| BIAS | Not connected (NC) on LT1375 series | Unused; left floating or tied to GND - distinguishes LT1375 (no BIAS) from LT1376 (BIAS-enabled) |
| VC | Error amplifier output / current limit comparator input | Used for loop compensation; voltage ranges from ~1V (light load) to ~2V (full load); clampable for override |
| FB/SENSE | Fixed 5V output sense input | Internally connected to 5V output; monitors regulation; triggers foldback if voltage drops below 1.7V |
| GND | Power and signal reference | Must be low-impedance path to load return; sensitive to EMI due to fast GND current spikes from VSW coupling |
| SHDN | Logic-level shutdown control | Active-low: <0.4V = full shutdown (20µA IQ); >2.38V = UVLO disable; 0.4–2.38V = normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz switching frequency | Enables predictable EMI filtering and consistent inductor sizing (5–10µH typical) without external sync required |
| Saturating switch design (0.4Ω RON) | Reduces conduction loss vs. conventional bipolar regulators - improves efficiency by ≥12% at 1A |
| Cycle-by-cycle current limiting | Prevents switch destruction during overload or short-circuit; limits peak switch current to 1.5A (≤50% DC) |
| Foldback protection (FB pin) | Automatically reduces switching frequency and current limit when output collapses - limits power dissipation under fault |
| Thermal shutdown with hysteresis | Shuts down at ~165°C junction; restarts after cooldown - protects against sustained overload or poor heatsinking |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Powering 5V logic rails (USB peripherals, display controllers, FPGA I/O banks) in clamshell notebooks with 12V main battery. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying regulated power to subsystems; operates continuously during active use and enters 20µA shutdown during sleep. Use Value: Delivers stable 5V at up to 1.25A with >85% efficiency across 7–15V input swing, extending runtime and minimizing heat buildup near keyboard area. |
Use Scenario: Providing 5V supply to handheld test equipment powered by 4×AA alkaline cells (6–9V fresh, down to 4.8V depleted). IC Role / Device Role / Timing Role: Main system regulator converting variable battery voltage to fixed 5V; UVLO prevents brownout operation below 5.5V input. Use Value: Maintains regulation down to 6V input while consuming only 2.5mA quiescent current - preserves battery capacity during idle periods. |
| Battery Charger Auxiliary Rail | Distributed Power Architecture |
Use Scenario: Generating isolated 5V auxiliary supply for charger management ICs and status LEDs in multi-cell Li-ion charging stations. IC Role / Device Role / Timing Role: Secondary regulator fed from primary 12V/24V bus; provides clean, noise-isolated 5V for analog sensing and communication circuits. Use Value: Fixed 5V output eliminates need for external feedback resistors; 500kHz operation allows small 5µH inductor - saves board space in dense charger modules. |
Use Scenario: Local point-of-load (POL) conversion in industrial PLC backplanes where 24V backbone feeds multiple 5V sensor nodes. IC Role / Device Role / Timing Role: Compact, self-contained buck stage replacing discrete MOSFET+controller solutions; mounted directly on sensor daughterboards. Use Value: Integrates control, switch, and protection in one SOIC-8 - reduces BOM count by ≥7 components and eliminates gate-drive layout complexity. |
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 | Includes BIAS pin for improved light-load efficiency; otherwise identical pinout, specs, and package | Better suited for high-VIN/low-IOUT scenarios (e.g., 24V→5V @ 50mA) where BIAS connection to 5V output yields >10% efficiency gain | Select LT1376CS8-5#PBF if input voltage exceeds 15V and light-load efficiency is critical; otherwise LT1375CS8-5#PBF is functionally sufficient |
| LM2678-5.0/NOPB | 5V fixed, 5A capable, 63kHz switching; larger SOIC-8 package; no foldback protection or BOOST drive | Higher current, lower frequency - better for low-noise, high-current applications but requires larger 47µH inductor and lacks short-circuit robustness | Choose LM2678-5.0/NOPB only when >1.5A output or ultra-low EMI is mandatory; LT1375CS8-5#PBF offers superior size/power density for ≤1.25A loads |
Compared with LT1376CS8-5#PBF, the LT1375CS8-5#PBF omits the BIAS pin - simplifying layout but sacrificing light-load efficiency above 15V input. Versus LM2678-5.0/NOPB, it trades raw current capability for 8× higher switching frequency, enabling 80% smaller magnetics and faster transient response at the cost of slightly higher EMI susceptibility.
Availability
LT1375CS8-5#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power architectures requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.
Supply support for LT1375CS8-5#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 product support, datasheets, and application engineering for the LT1375 family.
The LT1375 series was designed as a compact, high-frequency monolithic buck regulator targeting space-constrained, battery-sensitive applications where integration, low shutdown current, and fault resilience are prioritized over ultra-high current or programmability.
FAQ
What is the maximum continuous output current for LT1375CS8-5#PBF?
The LT1375CS8-5#PBF supports up to 1.25A continuous output at 5V with 10µH inductor and 10V input, limited by its 1.5A switch current rating and thermal constraints. At 25V input, max output drops to ~0.8A due to increased ripple current and reduced duty cycle headroom. Derating is required above 70°C ambient without enhanced heatsinking.
Does LT1375CS8-5#PBF require an external BOOST capacitor?
Yes, the LT1375CS8-5#PBF requires an external BOOST capacitor (typically 10nF ceramic) and catch diode (e.g., 1N5818) connected between VIN and BOOST pins. This network generates ~VIN+5V to saturate the internal NPN switch; omitting it increases switch voltage drop to ~1.5V and reduces efficiency by >15%.
Can LT1375CS8-5#PBF be synchronized to an external clock?
No, LT1375CS8-5#PBF does not support external synchronization. Only the LT1375 (non-"-5") adjustable version includes a SYNC pin. The fixed-output LT1375CS8-5#PBF operates at factory-trimmed 500kHz and cannot be synchronized or frequency-adjusted.
What is the purpose of the FB/SENSE pin on LT1375CS8-5#PBF?
On LT1375CS8-5#PBF, the FB/SENSE pin is internally connected to the 5V output and serves as the regulation feedback node. It also enables foldback protection: if voltage falls below 1.7V, current limit reduces; below 1.0V, switching frequency drops ~5:1 - enhancing short-circuit survivability without external components.
Is thermal shutdown active on LT1375CS8-5#PBF?
Yes, LT1375CS8-5#PBF includes fully integrated thermal shutdown with hysteresis. It disables switching when junction temperature exceeds ~165°C and automatically resumes operation after cooling by ~15°C. This protection operates independently of SHDN pin state and requires no external circuitry.
LT1375CS8-5#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
LT1375CS8-5#PBF FAQ
1.How can I place an order for LT1375CS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375CS8-5#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 LT1375CS8-5#PBF reliable?
The price and inventory of LT1375CS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375CS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1375CS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375CS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375CS8-5#PBF?
LT1375CS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375CS8-5#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 LT1375CS8-5#PBF?
For technical support, including LT1375CS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375CS8-5#PBF requirements.
6.How does Aetrix verify that LT1375CS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1375CS8-5#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 LT1375CS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1375CS8-5#PBF?
All LT1375CS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375CS8-5#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 LT1375CS8-5#PBF part is unused and in its original packaging.
Return procedure for LT1375CS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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