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Analog Devices Inc. LT1375IS8#TRPBF
- Part No.:
- LT1375IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1375IS8#TRPBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,607
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Product details
Overview
LT1375IS8#TRPBF from Analog Devices (formerly Linear Technology) is a 500kHz monolithic buck switching regulator with integrated 1.5A NPN power switch, fixed 5V output, and current-mode control architecture. It delivers up to 1.25A at 5V from 6V–25V input, features 0.4Ω switch on-resistance, 2.5mA quiescent current, and cycle-by-cycle current limiting-designed for battery-powered systems requiring compact, efficient DC/DC conversion.
For engineers reviewing the LT1375IS8#TRPBF datasheet, LT1375IS8#TRPBF pinout, LT1375IS8#TRPBF application, or LT1375IS8#TRPBF equivalent, key selection criteria include its fixed 5V output configuration, SO-8 package thermal performance (θJA = 120–150°C/W), shutdown current of 20µA, and compatibility with standard surface-mount inductors as small as 5µH.
Technical Context
The LT1375IS8#TRPBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops: one for voltage regulation via the error amplifier driving the VC pin, and another for cycle-by-cycle peak current sensing referenced to the SENSE (FB) pin. Its bipolar NPN switch is driven by a BOOST-supplied voltage to achieve saturation and low conduction loss.
It uses a fused-lead SO-8 package with GND pins on pins 3, 4, 7, and 8 for enhanced thermal dissipation and EMI control. The device integrates undervoltage lockout (2.38V UVLO threshold), thermal shutdown, and frequency foldback below 1V FB voltage-enabling robust short-circuit protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (guaranteed over temperature and line) |
| Switching Frequency | 500kHz nominal (440–570kHz over full –40°C to 125°C junction range) |
| Max Output Current | 1.25A at VOUT = 5V, VIN = 10V, L = 10µH (derates with duty cycle and inductor size) |
| Switch On-Resistance | 0.4Ω typical (enables >87% efficiency at 1A load with proper layout) |
| Quiescent Supply Current | 2.5mA typical (measured at VBIAS = 5V, switching enabled) |
| Shutdown Current | 20µA maximum (at VSHDN = 0V, TJ ≤ 125°C) |
| Input Voltage Range | 6V to 25V (minimum start-up voltage 5.0V; operation down to 5.5V guaranteed) |
Pinout & Package
LT1375IS8#TRPBF is housed in an 8-lead plastic SO (S8) package with fused corner GND pins for improved thermal resistance (θJA = 120–150°C/W depending on PCB layout). Pin 1 is BOOST; pin 2 is VIN; pin 3 is VSW; pin 4 is BIAS; pin 5 is VC; pin 6 is FB/SENSE; pin 7 is GND; pin 8 is SHDN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Supplies elevated voltage to saturate internal NPN switch; requires external 10nF–100nF capacitor to VIN |
| VIN | Main input supply and switch collector | Accepts 6V–25V; powers internal bias circuitry; 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 circuitry bias source | Connected to regulated 5V output to improve light-load efficiency; not used in LT1375 (only LT1376) |
| VC | Error amplifier output / current limit comparator input | Used for loop compensation; voltage ranges from ~1V (light load) to ~2V (full load); clamp limits max duty cycle |
| FB/SENSE | Feedback reference / output voltage sense | Fixed 5V version connects directly to output; senses 5.0V ±1.2%; enables foldback current/frequency below 1.7V/1.0V |
| GND | Analog and power ground reference | Four GND pins (3,4,7,8) reduce impedance; critical for load regulation and EMI control |
| SHDN | Enable/disable control input | Logic-compatible; 0.4V threshold for full shutdown, 2.38V for UVLO; pulls <50µA in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables fast transient response and inherent stability with minimal external compensation |
| Integrated 1.5A NPN switch | Eliminates need for external MOSFET driver; reduces BOM count and layout complexity |
| 5µH inductor support | Enables compact designs vs. legacy 15–33µH buck regulators; reduces board area by >40% |
| Two-threshold shutdown | 2.38V UVLO prevents startup until input is stable; 0.4V deep shutdown cuts supply current to 20µA |
| Frequency and current foldback | Reduces IC and external component stress during short-circuit by lowering fSW and ILIM below 1V FB |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Powering 5V logic rails and peripherals in laptops and tablets with wide-input Li-ion battery packs (7.2V–16.8V). IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 5V from varying battery voltage; operates in continuous conduction mode across full load range. Use Value: Enables use of smaller 5µH inductors and eliminates need for external current-sense resistors-reducing solution size by 30% vs. discrete buck controllers. |
Use Scenario: Providing stable 5V supply for microcontrollers, sensors, and RF modules in handheld test equipment and portable medical devices. IC Role / Device Role / Timing Role: Main system power converter with ultra-low 20µA shutdown current to extend battery life during sleep modes. Use Value: Maintains >85% efficiency at 10mA–1A loads, minimizing thermal rise in sealed enclosures without heatsinks. |
| Battery Charger Auxiliary Supply | Distributed Power Architectures |
Use Scenario: Generating isolated 5V bias for charger controller ICs and gate drivers in multi-cell Li-ion charging systems. IC Role / Device Role / Timing Role: Secondary regulator powered from main DC bus (12V–24V); provides clean, ripple-free 5V for analog and digital circuits. Use Value: Integrated cycle-by-cycle current limiting protects against fault conditions during charger IC startup and communication bursts. |
Use Scenario: Local point-of-load (POL) conversion in industrial PLCs and telecom line cards where 5V rails feed FPGAs, ADCs, and interface ICs. IC Role / Device Role / Timing Role: Compact, thermally robust buck stage mounted near load; leverages fused-GND SO-8 for reliable operation at 125°C ambient. Use Value: SO-8 package with four GND pins ensures <15mV load regulation error and <10mV ripple under dynamic 1A step loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1376IS8-5#TRPBF | Includes BIAS pin for improved light-load efficiency; otherwise identical pinout, specs, and SO-8 package | Preferred when input voltage exceeds 12V and light-load efficiency is critical (e.g., 24V industrial inputs) | Select LT1376IS8-5#TRPBF if BIAS functionality is needed; LT1375IS8#TRPBF remains optimal for cost-sensitive 6–12V battery apps |
| LM2678SD-5.0/NOPB | 5V fixed-output buck; 5A rating; 260kHz switching; SO-8 package; higher quiescent current (50mA) | Better suited for high-current, lower-frequency applications where EMI filtering is prioritized over size | Choose LM2678SD-5.0/NOPB only when >1.5A output or lower EMI is required; not drop-in compatible due to different pin functions and compensation |
Compared with LT1375IS8#TRPBF, LT1376IS8-5#TRPBF adds BIAS pin functionality for >10% efficiency gain at light loads with high VIN/VOUT ratios, while LM2678SD-5.0/NOPB trades higher current capability and lower EMI for larger magnetics and reduced integration-making LT1375IS8#TRPBF the optimal choice for space-constrained 1.25A 5V applications.
Availability
LT1375IS8#TRPBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power architectures requiring stable component supply, extended temperature operation (–40°C to 125°C), and long-term industrial lifecycle support.
Supply support for LT1375IS8#TRPBF 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 its high-performance analog and power management portfolio. Linear's legacy design ethos emphasizes precision, reliability, and application-ready integration.
The LT1375 belongs to Linear's monolithic buck regulator family targeting compact, efficient DC/DC conversion in space- and thermal-constrained environments-specifically engineered for battery-powered and industrial embedded systems demanding fixed 5V output with minimal external components.
FAQ
What is the operating temperature range for the LT1375IS8#TRPBF?
The LT1375IS8#TRPBF is specified for operation from –40°C to +125°C junction temperature. This industrial-grade rating is confirmed in the Absolute Maximum Ratings table and supported by full-temperature electrical characterization (e.g., reference voltage, switching frequency, and current limit tested across –40°C to 125°C). The SO-8 package's fused GND pins enhance thermal performance under sustained 1.25A loads at high ambient temperatures.
Does the LT1375IS8#TRPBF require an external BOOST capacitor?
Yes, the LT1375IS8#TRPBF requires an external BOOST capacitor connected between the BOOST pin and VIN. This capacitor (typically 10nF–100nF ceramic) generates the elevated drive voltage needed to saturate the internal NPN switch, reducing on-resistance to 0.4Ω and enabling >87% efficiency. Omitting it results in excessive switch voltage drop (~1.5V) and severe efficiency degradation.
Can the LT1375IS8#TRPBF be synchronized to an external clock?
No, the LT1375IS8#TRPBF does not support external synchronization. Only the LT1375 (non-"I" grade) and LT1375HV variants include a SYNC pin. The "I" grade LT1375IS8#TRPBF omits SYNC functionality-its oscillator runs at a fixed 500kHz (440–570kHz over temperature) with no external timing input capability.
What is the minimum input voltage required for the LT1375IS8#TRPBF to regulate 5V output?
The LT1375IS8#TRPBF guarantees regulation down to 5.5V input (typical minimum start-up is 5.0V). Below 6V, output current capability decreases significantly due to reduced duty cycle margin and increased conduction losses. For 5V output, operation below 6V is possible but requires careful inductor selection and thermal validation per the "Minimum Input Voltage" graph in the datasheet.
How does the LT1375IS8#TRPBF handle short-circuit conditions?
The LT1375IS8#TRPBF employs dual protection: cycle-by-cycle current limiting (1.5A typical) and frequency foldback. When FB/SENSE voltage drops below 1.0V during overload, switching frequency reduces ~5:1 and current limit folds back below 1A-limiting power dissipation in the IC, catch diode, and inductor. This allows indefinite short-circuit survival without thermal shutdown under typical PCB layouts.
LT1375IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1375IS8#TRPBF FAQ
1.How can I place an order for LT1375IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1375IS8#TRPBF 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 LT1375IS8#TRPBF reliable?
The price and inventory of LT1375IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1375IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1375IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1375IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1375IS8#TRPBF?
LT1375IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1375IS8#TRPBF 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 LT1375IS8#TRPBF?
For technical support, including LT1375IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1375IS8#TRPBF requirements.
6.How does Aetrix verify that LT1375IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1375IS8#TRPBF 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 LT1375IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1375IS8#TRPBF?
All LT1375IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1375IS8#TRPBF, 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 LT1375IS8#TRPBF part is unused and in its original packaging.
Return procedure for LT1375IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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