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Analog Devices Inc. LT1376IS8-5#PBF
- Part No.:
- LT1376IS8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376IS8-5#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:336
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Product details
Overview
LT1376IS8-5#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 bipolar NPN power switch, current-mode control, cycle-by-cycle current limiting, and 0.4Ω typical switch on-resistance. Designed for battery-powered systems and distributed power rails, it delivers up to 1.25A at 5V output with input voltage range 6V to 25V.
For engineers reviewing the LT1376IS8-5#PBF datasheet, LT1376IS8-5#PBF pinout, LT1376IS8-5#PBF application, or LT1376IS8-5#PBF equivalent, key selection criteria include guaranteed 5V ±1.2% output accuracy over temperature, 20µA shutdown current, thermal shutdown protection, and compatibility with standard surface-mount 5µH inductors and solid tantalum output capacitors.
Technical Context
The LT1376IS8-5#PBF implements constant-frequency current-mode control using an internal 500kHz oscillator and dual feedback loops - one for output voltage regulation via the SENSE pin, another for cycle-by-cycle peak current limiting. Its bipolar NPN switch is driven by a BOOST pin circuit enabling saturation and low conduction loss.
Unlike voltage-mode controllers, this architecture provides fast transient response and inherent loop stability without external compensation complexity. The BIAS pin (present only on LT1376 variants) allows efficiency optimization by sourcing internal bias current from the regulated 5V output rather than VIN when input voltage exceeds ~7.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% over full temperature range - eliminates external resistor divider and improves long-term stability. |
| Switch Current Limit | 1.5A at ≤50% duty cycle - sets maximum deliverable load current before foldback activation. |
| Switching Frequency | 500kHz ±6% - enables compact 5µH inductor use and reduces output ripple frequency. |
| Shutdown Current | 20µA max - supports ultra-low-power standby in portable and battery-backed systems. |
| Input Voltage Range | 6V to 25V - accommodates 12V nominal rails and wide industrial input variations. |
| Efficiency | Up to 87% at 1A, VIN=10V - achieved via BOOST-driven saturated switch and BIAS pin optimization. |
| Thermal Shutdown | Integrated - protects device during overload or poor PCB heatsinking conditions. |
Pinout & Package
LT1376IS8-5#PBF is housed in an 8-lead plastic SOIC (S8) package with θJA = 120–150°C/W depending on PCB layout. Pin 1 is marked with a dot; pin numbering follows standard SOIC convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Boost capacitor drive node | Provides >VIN voltage to saturate internal NPN switch; requires external diode + capacitor (e.g., 1N5818 + 10nF) for <0.4Ω RON. |
| VIN | Main power input | Collector of internal NPN switch; powers internal circuitry unless BIAS pin is used; must be bypassed near pin with ≥100µF solid tantalum. |
| VSW | Switch emitter node | Connects to inductor; swings negative during off-time - requires external catch diode (e.g., 1N5818) clamped to GND. |
| BIAS | Internal bias supply source | When tied to 5V output, shifts internal bias current from VIN to VOUT - improves efficiency at high VIN/low IOUT. |
| VC | Error amplifier output | Drives peak current comparator; used for loop compensation (capacitor to GND); clamp range 0.9V–2.1V. |
| FB/SENSE | Output voltage sense input | On LT1376IS8-5#PBF, functions as SENSE pin - connected directly to 5V output; internal 2.42V reference sets regulation point. |
| GND | Power and signal reference | Must be short, low-impedance path to load return; shared GND paths cause load regulation error and EMI from VSW-GND capacitance spikes. |
| SHDN | Enable/shutdown control | Logic-level input: <0.4V = full shutdown (20µA), >2.38V = UVLO lockout - prevents operation below safe input voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode topology | Enables stable operation with minimal output capacitance and fast transient response without complex compensation networks. |
| Integrated cycle-by-cycle current limiting | Prevents switch destruction during short-circuit or overload - folds back current limit below 1.7V FB voltage. |
| BOOST-driven saturated switch | Achieves 0.4Ω typical RON with bipolar process - delivers higher efficiency than conventional bipolar regulators at 500kHz. |
| Two-threshold shutdown pin | 0.4V threshold enables micropower shutdown; 2.38V threshold provides accurate undervoltage lockout (UVLO) for system sequencing. |
| Frequency foldback under fault | Reduces switching frequency ~5:1 when SENSE voltage drops below 1V - limits power dissipation in IC, diode, and inductor during short-circuit. |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Powering 5V logic rails and peripheral interfaces in clamshell notebooks with limited board space and thermal budget. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying CPU I/O, USB PHY, and display timing circuits. Use Value: Delivers 1.25A at 5V from 12V battery input with 87% efficiency and no external feedback resistors - reducing component count and layout area. | Use Scenario: Regulating 5V for microcontroller subsystems in handheld test equipment operating from Li-ion packs (8.4V–12.6V). IC Role / Device Role / Timing Role: Main DC-DC converter enabling low-quiescent operation and clean 5V supply during sleep mode. Use Value: 20µA shutdown current extends battery life; BIAS pin connection to 5V output improves light-load efficiency by >10% at VIN=12V. |
| Battery Charger | Distributed Power |
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-side 5V regulator powered from intermediate 12V bus derived from main AC/DC converter. Use Value: Withstands 25V max input transients; thermal shutdown prevents latch-up during intermittent short-circuit events on downstream loads. | Use Scenario: Providing local 5V rails in modular industrial PLC backplanes where multiple point-of-load converters feed FPGA I/O banks and sensor interfaces. IC Role / Device Role / Timing Role: Compact, robust buck stage delivering regulated 5V to noise-sensitive analog front-ends. Use Value: Fixed 5V output eliminates calibration drift; 500kHz switching allows small 5µH inductors - easing mechanical integration in dense backplane layouts. |
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#TRPBF | 4MHz synchronous buck, 1.2A, integrated MOSFETs, 2.5V–5.5V input - no BOOST pin or external diode required. | Designed for low-input-voltage, high-density applications (e.g., USB-powered devices); not suitable for 6–25V input range. | Select LTC3605EDE-5#TRPBF only if input voltage is ≤5.5V and board space is constrained - LT1376IS8-5#PBF remains optimal for wider industrial input ranges. |
| TPS54202DRCT | 2A synchronous buck, 4.5–28V input, 500kHz, integrated FETs, 12µA quiescent current - uses different control architecture (voltage-mode with D-CAP2). | Offers higher current and lower IQ but lacks built-in frequency foldback and two-threshold shutdown - requires external fault handling. | Choose TPS54202DRCT for higher output current needs and lower standby power; retain LT1376IS8-5#PBF when robust short-circuit protection and proven field reliability in industrial environments are critical. |
Compared with LTC3605EDE-5#TRPBF and TPS54202DRCT, LT1376IS8-5#PBF provides superior fault resilience via integrated frequency foldback and dual-threshold shutdown, while maintaining compatibility with legacy 5µH inductor designs and offering proven performance across 6–25V inputs without requiring layout redesign.
Availability
LT1376IS8-5#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, battery chargers, and distributed power applications requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for LT1376IS8-5#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, documentation, and manufacturing continuity for all Linear-branded parts including the LT1376 series.
The LT1376 product line was designed specifically for high-efficiency, medium-current DC-DC conversion in space-constrained industrial and portable systems - emphasizing ruggedness, thermal reliability, and minimal external component count.
FAQ
What is the guaranteed output voltage tolerance for LT1376IS8-5#PBF over temperature?
The LT1376IS8-5#PBF guarantees a 5.0V output with ±1.2% accuracy across its full operating junction temperature range of –40°C to 125°C. This specification is verified by the internal 2.42V reference and trimmed SENSE pin circuitry - no external components affect this tolerance, making it suitable for precision 5V rail generation without calibration.
Can LT1376IS8-5#PBF operate with input voltage below 6V?
No - the absolute minimum input voltage for reliable operation of LT1376IS8-5#PBF is 6V, as specified in the datasheet's Applications Information section. Below this, internal bias lines cannot maintain regulation, causing oscillator frequency drift and potential loss of output regulation. For 4.5–12V input applications, consider the functionally compatible LT1507 instead.
Does LT1376IS8-5#PBF require an external catch diode, and what type is recommended?
Yes, LT1376IS8-5#PBF requires an external Schottky catch diode connected between VSW and GND. The datasheet specifies the 1N5818 (3A, 40V) as the reference part. Using a diode with higher forward voltage or slower recovery increases conduction losses and reduces efficiency - especially critical at high switching frequencies and heavy loads.
How does the BIAS pin improve efficiency in LT1376IS8-5#PBF?
The BIAS pin on LT1376IS8-5#PBF allows internal bias circuitry to draw current from the regulated 5V output instead of VIN. When VIN is significantly higher than 5V (e.g., 12V or 24V), this reduces total input-referred quiescent current by >10%, directly improving light-load efficiency - confirmed in the datasheet's Typical Performance Characteristics (Figure 12).
What protection features are integrated into LT1376IS8-5#PBF?
LT1376IS8-5#PBF integrates cycle-by-cycle current limiting, thermal shutdown, and dual-threshold shutdown (0.4V for micropower disable, 2.38V for UVLO). It also implements frequency foldback below 1V SENSE voltage and current foldback below 1.7V SENSE voltage - collectively protecting the IC, external diode, and inductor during sustained short-circuit conditions.
LT1376IS8-5#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1376IS8-5#PBF FAQ
1.How can I place an order for LT1376IS8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376IS8-5#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 LT1376IS8-5#PBF reliable?
The price and inventory of LT1376IS8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376IS8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1376IS8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376IS8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376IS8-5#PBF?
LT1376IS8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376IS8-5#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 LT1376IS8-5#PBF?
For technical support, including LT1376IS8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376IS8-5#PBF requirements.
6.How does Aetrix verify that LT1376IS8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1376IS8-5#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 LT1376IS8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1376IS8-5#PBF?
All LT1376IS8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376IS8-5#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 LT1376IS8-5#PBF part is unused and in its original packaging.
Return procedure for LT1376IS8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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