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Analog Devices Inc. LT1375CS8#PBF
- Part No.:
- LT1375CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375CS8#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:375
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Product details
Overview
LT1375CS8#PBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with integrated 1.5A NPN power switch, 2.42V internal reference, 0.4Ω typical switch on-resistance, and fixed 5V output. It operates from 6V to 25V input, delivers up to 1.25A at 5V, and targets battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1375CS8#PBF datasheet, LT1375CS8#PBF pinout, LT1375CS8#PBF application, or LT1375CS8#PBF equivalent, key selection criteria include its constant-frequency current-mode control, cycle-by-cycle current limiting, 20µA shutdown current, SO-8 package thermal performance (θJA = 120–150°C/W), and compatibility with standard surface-mount inductors as small as 5µH.
Technical Context
The LT1375CS8#PBF implements current-mode control using an internal oscillator, error amplifier (2000 µMho transconductance), and peak-current comparator referenced to the VC pin. Its bipolar NPN switch is driven via BOOST pin voltage (≥VIN + 5V) to achieve saturation and low conduction loss.
It features dual shutdown thresholds: 2.38V for undervoltage lockout (UVLO) and 0.4V for micropower shutdown. Frequency foldback activates below 1V FB voltage, reducing switching frequency up to 5:1 during short-circuit conditions to limit power dissipation in the IC and external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz nominal; enables use of small 5–10 µH inductors and reduces filter component size. |
| Output Voltage | Fixed 5 V ±1.2% (4.94–5.06 V); eliminates external feedback divider and simplifies layout. |
| Max Output Current | 1.25 A at VOUT = 5 V, VIN = 10 V, L = 10 µH; derates with higher duty cycle or smaller inductor. |
| Switch On-Resistance | 0.4 Ω typical (at ISW = 1.5 A, VBOOST = VIN + 5 V); minimizes conduction loss and improves efficiency >87%. |
| Shutdown Current | 20 µA max (VSHDN = 0 V, VIN ≤ 25 V); enables ultra-low-power standby in portable applications. |
| Input Voltage Range | 6 V to 25 V (min input defined by bias regulation; actual start-up requires ≥5.5 V per test data). |
| Reference Voltage | 2.42 V (used internally for 5 V output regulation; SENSE pin monitors output directly). |
Pinout & Package
LT1375CS8#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad thermal enhancement. Pin assignments are validated per Linear Technology's official 13756fd datasheet (Rev. G).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Supplies >VIN voltage to saturate internal NPN switch; must be connected to VIN via 0.1 µF ceramic capacitor and Schottky diode. |
| VIN | Power input and switch collector | Connects to input supply and internal switch collector; high di/dt node requiring local 100 µF solid tantalum bypass. |
| VSW | Switch emitter | Drives inductor; swings negative during off-time and must be clamped by external catch diode (e.g., 1N5818). |
| BIAS | Not connected (NC) | Unused on LT1375 series; LT1376 includes BIAS pin for efficiency optimization-LT1375CS8#PBF has no BIAS functionality. |
| VC | Error amplifier output / current limit control | Controls peak switch current; used for loop compensation; clamp range 0.9–2.1 V; drives to ground disables regulation. |
| FB/SENSE | Output voltage sense input | Fixed 5 V version uses this pin as SENSE-directly connects to regulated 5 V output for closed-loop feedback. |
| GND | Power and signal reference | Must tie to low-impedance ground plane; serves as output load reference and carries high-frequency switching return currents. |
| SHDN | Shutdown control | Logic-compatible input: <0.4 V = full shutdown (20 µA IQ); >2.38 V = UVLO disable; 0.4–2.38 V = active operation. |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500 kHz switching frequency | Enables predictable EMI filtering and consistent inductor sizing across designs without frequency drift. |
| Integrated 1.5 A NPN power switch | Eliminates external MOSFET and gate driver; reduces BOM count and PCB area while maintaining bipolar efficiency. |
| Current-mode control architecture | Provides inherent cycle-by-cycle current limiting, fast transient response, and stable loop compensation with minimal external parts. |
| BOOST-driven saturated switch | Achieves 0.4 Ω RON equivalent-reducing conduction loss vs. conventional bipolar designs and enabling >87% efficiency. |
| Two-threshold shutdown logic | Separates UVLO (2.38 V) from deep shutdown (0.4 V), allowing controlled power sequencing and brown-out protection. |
| Frequency and current foldback | Reduces switching frequency and peak current when FB/SENSE <1 V or <1.7 V-limiting thermal stress during output shorts. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
|
Use Scenario: Powering 5 V logic rails and peripheral interfaces in clamshell notebooks with limited board space and thermal budget. IC Role / Device Role / Timing Role: Primary 5 V buck converter delivering regulated output from single-cell Li-ion (8–12 V) or multi-cell pack (12–24 V) inputs. Use Value: 20 µA shutdown current extends battery life in sleep mode; 500 kHz operation allows 5 µH inductor, reducing solution footprint by >30% vs. 100 kHz alternatives. |
Use Scenario: Supplying 5 V to microcontrollers, sensors, and RF modules in handheld test equipment and portable medical devices. IC Role / Device Role / Timing Role: Main system regulator converting wide-input battery voltage (6–25 V) to stable 5 V with high light-load efficiency. Use Value: Current-mode control ensures stable regulation under dynamic load steps (e.g., BLE radio burst transmission); foldback protects against sustained short-circuits. |
| Battery Charger Auxiliary Rail | Distributed Power Architectures |
|
Use Scenario: Generating isolated 5 V bias for charger controller ICs and status LEDs in multi-bay Li-ion charging stations. IC Role / Device Role / Timing Role: Secondary non-isolated 5 V supply derived from main DC bus (e.g., 12–24 V), independent of primary charger topology. Use Value: Fixed 5 V output eliminates feedback resistor network; SO-8 package supports automated assembly; 0.4 Ω switch minimizes dropout at high ambient temperature. |
Use Scenario: Local point-of-load (POL) regulation in industrial PLC backplanes where 24 V or 48 V distribution buses feed multiple subsystems. IC Role / Device Role / Timing Role: Compact, robust 5 V POL converter placed near noise-sensitive analog or communication circuits. Use Value: SO-8 thermal resistance (120–150°C/W) enables operation at 70°C ambient without heatsink; cycle-by-cycle current limiting prevents fault propagation across distributed nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#PBF | 4 MHz synchronous buck, 3 A, 2.5–5.5 V input, integrated MOSFETs; no BOOST pin required. | Targets lower input voltages and higher current; unsuitable for 6–25 V input range of LT1375CS8#PBF. | Select only if input is ≤5.5 V and higher efficiency at light loads is critical; not drop-in compatible. |
| LM2678SX-5.0/NOPB | 63 kHz buck, 5 A, 8–40 V input, external MOSFET driver; larger inductor (33–100 µH) required. | Higher current, wider input range, but lower frequency increases solution size and EMI filtering complexity. | Choose when >1.25 A output or >25 V input is needed; requires redesign of magnetics and compensation. |
Compared with LTC3605EDE#PBF and LM2678SX-5.0/NOPB, the LT1375CS8#PBF uniquely balances mid-range input (6–25 V), fixed 5 V output, 500 kHz operation, and BOOST-assisted bipolar switch efficiency-making it optimal for space-constrained 5 V systems where input exceeds 5.5 V and cost-sensitive BOMs exclude synchronous controllers.
Availability
LT1375CS8#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LT1375CS8#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 LT1375CS8#PBF belongs to Linear's monolithic buck regulator family designed for high-efficiency, compact DC/DC conversion in battery-operated and industrial applications where fixed-output simplicity and robust fault protection are essential.
FAQ
What is the maximum input voltage rating for the LT1375CS8#PBF?
The absolute maximum input voltage for the LT1375CS8#PBF is 25 V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. The device is characterized for reliable operation from 6 V to 25 V, with minimum functional input voltage of 5.5 V under typical conditions. Always observe derating guidelines for extended temperature or high-reliability applications.
Does the LT1375CS8#PBF require an external BOOST capacitor, and what value is recommended?
Yes, the LT1375CS8#PBF requires an external BOOST capacitor connected between BOOST and VIN pins. A 0.1 µF X7R ceramic capacitor is recommended per the datasheet, placed as close as possible to the IC. This capacitor, charged via an external Schottky diode (e.g., 1N5817), generates the boosted voltage needed to saturate the internal NPN switch and achieve 0.4 Ω on-resistance.
Can the LT1375CS8#PBF be synchronized to an external clock?
No, the LT1375CS8#PBF does not support external synchronization. Only the LT1375 variant (not the -5 fixed-output version) includes a SYNC pin. The LT1375CS8#PBF is the fixed 5 V version and lacks the SYNC function-its oscillator runs autonomously at 500 kHz. For synchronizable 5 V buck regulation, consider the LT1375CS8 (adjustable version) or LT1376CS8-5.
What is the purpose of the SHDN pin's dual thresholds on the LT1375CS8#PBF?
The SHDN pin on the LT1375CS8#PBF has two distinct thresholds: 2.38 V initiates undervoltage lockout (UVLO), disabling switching until input rises sufficiently; 0.4 V triggers full micropower shutdown, reducing supply current to 20 µA. This dual-threshold design enables precise power sequencing and brown-out protection without external circuitry-critical for battery systems with variable voltage profiles.
How does the LT1375CS8#PBF protect against output short-circuit conditions?
The LT1375CS8#PBF employs dual-foldback protection: when FB/SENSE voltage drops below 1.7 V, peak switch current is reduced; below 1 V, switching frequency folds back up to 5:1. Combined with cycle-by-cycle current limiting (1.5 A typical) and thermal shutdown, this limits power dissipation in both the IC and external components during sustained shorts-enabling safe operation without external current-limiting circuitry.
LT1375CS8#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 21.5V
- 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#PBF FAQ
1.How can I place an order for LT1375CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375CS8#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#PBF reliable?
The price and inventory of LT1375CS8#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#PBF is usually 5 days.
3.What payment methods are accepted for LT1375CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375CS8#PBF?
LT1375CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375CS8#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#PBF?
For technical support, including LT1375CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375CS8#PBF requirements.
6.How does Aetrix verify that LT1375CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1375CS8#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#PBF meets industry standards.
7.What is the process for return or replacement of LT1375CS8#PBF?
All LT1375CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375CS8#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#PBF part is unused and in its original packaging.
Return procedure for LT1375CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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