My Inquiry
My Account
Analog Devices Inc. LT1376CN8-5#PBF
- Part No.:
- LT1376CN8-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1376CN8-5#PBF.pdf
- Description:
- IC REG BUCK SEPIC 5V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1376CN8-5#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 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 LT1376CN8-5#PBF datasheet, LT1376CN8-5#PBF pinout, LT1376CN8-5#PBF application, or LT1376CN8-5#PBF equivalent, key selection criteria include its fixed 5V output, 500kHz constant-frequency operation, cycle-by-cycle current limiting, 20µA shutdown current, and BIAS pin efficiency optimization for high-VIN/low-IOUT conditions.
Technical Context
The LT1376CN8-5#PBF implements current-mode control with internal slope compensation, enabling fast transient response and stable loop behavior across wide load and line variations. Its architecture uses a 2.42V internal reference tied to the SENSE pin (FB/SENSE), eliminating external feedback resistors for the fixed 5V variant.
It employs a BOOST-capacitor-assisted drive scheme to saturate the on-chip NPN switch, reducing conduction loss to ~0.4Ω and enabling >87% efficiency at full load. The BIAS pin (present only on LT1376, not LT1375) allows sourcing internal bias current from VOUT, improving efficiency by >10% at VIN = 20V / VOUT = 5V / IOUT = 25mA.
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; derates to 1.35A at 80% duty cycle - defines max continuous output current with appropriate inductor sizing |
| Switching Frequency | 500kHz ±10% (typical); enables use of small 5µH inductors and compact ceramic output capacitors |
| Shutdown Current | 20µA (max) - supports ultra-low-power battery hold-up and system-level power sequencing |
| Input Voltage Range | 6V to 25V (min input 5.5V guaranteed) - compatible with 12V industrial rails and multi-cell Li-ion battery packs |
| Efficiency | 87%+ at 1A, VIN=12V, VOUT=5V - achieved via BOOST-driven saturation and BIAS pin optimization |
| Thermal Resistance θJA | 100°C/W (PDIP N8 package) - requires minimal copper area for 1.25A continuous operation at ambient ≤70°C |
Pinout & Package
LT1376CN8-5#PBF is housed in an 8-pin plastic DIP (N8) package with through-hole mounting. Pin 1 is marked with a notch or dot; pin numbering follows standard counter-clockwise convention from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Charge pump boost supply input | Accepts external capacitor/diode network to generate ~VIN+5V drive voltage; enables NPN switch saturation and low 0.4Ω effective on-resistance |
| VIN | Main power input and switch collector | Supplies internal circuitry and powers the NPN switch collector; must be bypassed locally with ≥100µF solid tantalum capacitor |
| 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 selector | When tied to VOUT (≥3.3V), shifts internal bias current source from VIN to VOUT, improving efficiency at high VIN/low IOUT |
| VC | Error amplifier output / current limit comparator input | Used for loop compensation (capacitor to GND); also serves as current clamp point - driving VC to GND disables regulation |
| FB/SENSE | Output voltage sense input (fixed 5V mode) | Connected directly to regulated 5V output; monitors output for regulation and triggers foldback protection if voltage drops below 1.7V |
| GND | Analog and power ground reference | Must be connected to low-impedance ground plane; serves as reference for SENSE, VC, and SHDN - critical for load regulation and EMI control |
| SHDN | Enable/shutdown control input | Logic-compatible input: <0.4V = full shutdown (20µA IQ); >2.38V = UVLO lockout; 0.4–2.38V = active regulation |
Key Features
| Feature | Design Value |
|---|---|
| Constant 500kHz switching frequency | Enables predictable EMI filtering and consistent inductor/capacitor selection across designs - no external timing components required |
| Integrated current-mode control with slope compensation | Provides inherent cycle-by-cycle current limiting and eliminates need for external current-sense resistor - improves reliability under short-circuit conditions |
| BOOST-assisted NPN switch saturation | Reduces effective switch conduction loss to 0.4Ω - achieves >87% efficiency without requiring expensive MOSFETs or complex gate drivers |
| Two-threshold shutdown pin (SHDN) | Combines precise undervoltage lockout (2.38V) and deep micropower shutdown (0.4V) - supports robust power sequencing and battery preservation |
| Feedback foldback protection | Automatically reduces switching frequency and current limit when SENSE voltage falls below 1.7V or 1.0V - limits power dissipation during output shorts without external circuitry |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Compact handheld glucose meters and pulse oximeters powered by two AA alkaline cells (1.8–3.2V) with a boost stage feeding LT1376CN8-5#PBF. IC Role / Device Role / Timing Role: Primary 5V power rail generator delivering regulated 5V @ 1.25A to microcontroller, display, and analog front-end. Use Value: 20µA shutdown current extends battery life between measurements; fixed 5V output eliminates feedback resistor tolerance errors affecting ADC reference stability. |
Use Scenario: Remote environmental sensor nodes using Li-ion (3.0–4.2V) or 3.6V primary lithium batteries, with LT1376CN8-5#PBF powering MCU and RF transceiver. IC Role / Device Role / Timing Role: Main system regulator supplying 5V to low-power ARM Cortex-M0+ and sub-GHz ISM-band transceiver (e.g., Si4463). Use Value: BIAS pin connection to VOUT improves efficiency by >10% at light loads - critical for multi-year battery operation in unattended deployments. |
| Industrial Control I/O Modules | Distributed Power for Test Equipment |
Use Scenario: DIN-rail mounted PLC I/O modules accepting 12–24V DC input, where LT1376CN8-5#PBF generates isolated 5V for digital logic and optocoupler interfaces. IC Role / Device Role / Timing Role: Non-isolated 5V local supply for microcontroller, SPI peripherals, and level-shifting buffers in space-constrained enclosures. Use Value: 500kHz operation allows use of 5µH shielded power inductors - reduces board area by >40% vs. 100kHz alternatives while maintaining low EMI. |
Use Scenario: Modular benchtop test instruments (e.g., multimeters, signal generators) requiring clean, stable 5V rails for precision DACs, op-amps, and FPGA configuration memory. IC Role / Device Role / Timing Role: Secondary regulation stage converting 12V intermediate bus to low-noise 5V for analog signal chains and digital core logic. Use Value: Current-mode control provides <10µs transient response to load steps - maintains voltage within ±1% during FPGA configuration bursts or DAC settling events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | 5V fixed, 5A capable, 63kHz switching frequency, SO-8 package; higher current but larger magnetics required | Targets higher-power applications (>2A) where thermal headroom and PCB area allow larger inductors | Choose LM2678-5.0/NOPB when output current demand exceeds 1.5A or when lower EMI at 63kHz is prioritized over size |
| TPS54202DRCT | 5V adjustable (requires feedback resistors), 2A, 500kHz, integrated FETs, 10-pin WSON; no BOOST/Bias pins, higher quiescent current (48µA) | Suitable for new designs where footprint minimization and integrated FETs outweigh need for BIAS efficiency optimization | Choose TPS54202DRCT for space-constrained PCBs needing 2A capability and simplified layout - but verify 48µA shutdown current meets battery-life requirements |
Compared with LM2678-5.0/NOPB and TPS54202DRCT, LT1376CN8-5#PBF offers superior efficiency at light loads due to BIAS pin operation and lower shutdown current, while maintaining compact 5µH magnetics - making it optimal for battery longevity and size-sensitive 1.25A applications.
Availability
LT1376CN8-5#PBF is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, industrial control I/O modules, and distributed power for test equipment requiring stable component supply with long-term manufacturability.
Supply support for LT1376CN8-5#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1376 belongs to Linear Technology's legacy monolithic buck regulator family, designed specifically for high-efficiency, low-component-count DC/DC conversion in battery-powered and space-constrained systems where thermal performance and light-load efficiency are critical.
FAQ
What is the maximum continuous output current of the LT1376CN8-5#PBF?
The LT1376CN8-5#PBF supports up to 1.25A continuous output current at 5V with proper thermal design and inductor selection (e.g., 10µH). Its internal switch current limit is 1.5A at ≤50% duty cycle, decreasing to 1.35A at 80% duty cycle. Output current is further constrained by inductor ripple and thermal limits - actual max load depends on VIN, ambient temperature, and PCB copper area.
Does the LT1376CN8-5#PBF require external feedback resistors?
No. The LT1376CN8-5#PBF is the fixed 5V version of the LT1376 family and contains internal feedback divider resistors. The FB/SENSE pin is used solely as a SENSE input and must be connected directly to the regulated 5V output - no external resistors are needed or permitted for output voltage setting.
How does the BIAS pin improve efficiency in the LT1376CN8-5#PBF?
The BIAS pin on the LT1376CN8-5#PBF allows internal bias circuitry to draw operating current from the regulated 5V output instead of the higher VIN rail. When BIAS is tied to VOUT (≥3.3V), this reduces total input-referred quiescent current - yielding >10% efficiency improvement at VIN = 20V / IOUT = 25mA, critical for battery-powered applications.
What protection features are built into the LT1376CN8-5#PBF?
The LT1376CN8-5#PBF includes cycle-by-cycle current limiting, thermal shutdown, undervoltage lockout (2.38V SHDN threshold), deep micropower shutdown (0.4V SHDN threshold), and feedback-foldback protection. When SENSE voltage drops below 1.7V, current limit folds back; below 1.0V, switching frequency reduces ~5:1 - collectively limiting power dissipation during output shorts or startup faults.
Can the LT1376CN8-5#PBF be synchronized to an external clock?
No. External synchronization is supported only on the LT1375 variant (via SYNC pin). The LT1376CN8-5#PBF lacks a SYNC pin and operates at a fixed 500kHz internal oscillator frequency. For synchronized operation, the LT1375CN8-5#PBF or LT1375CS8-5#PBF must be selected instead.
LT1376CN8-5#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1376CN8-5#PBF FAQ
1.How can I place an order for LT1376CN8-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376CN8-5#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 LT1376CN8-5#PBF reliable?
The price and inventory of LT1376CN8-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376CN8-5#PBF is usually 5 days.
3.What payment methods are accepted for LT1376CN8-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376CN8-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376CN8-5#PBF?
LT1376CN8-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376CN8-5#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 LT1376CN8-5#PBF?
For technical support, including LT1376CN8-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376CN8-5#PBF requirements.
6.How does Aetrix verify that LT1376CN8-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT1376CN8-5#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 LT1376CN8-5#PBF meets industry standards.
7.What is the process for return or replacement of LT1376CN8-5#PBF?
All LT1376CN8-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376CN8-5#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 LT1376CN8-5#PBF part is unused and in its original packaging.
Return procedure for LT1376CN8-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1376CN8-5#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
