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Analog Devices Inc. LT1376HVCS8#PBF
- Part No.:
- LT1376HVCS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1376HVCS8#PBF.pdf
- Description:
- IC REG BUCK SEPIC ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LT1376HVCS8#PBF from Analog Devices (formerly Linear Technology) is a 500kHz, 1.5A monolithic buck switching regulator in an 8-lead SOIC package, featuring fixed 5V output, 6V–25V input range, 0.4Ω switch on-resistance, and 2.5mA quiescent current. It delivers up to 1.25A at 5V in portable computers and battery-powered systems with high efficiency enabled by BOOST-pin-driven saturation.
For engineers reviewing the LT1376HVCS8#PBF datasheet, LT1376HVCS8#PBF pinout, LT1376HVCS8#PBF application, or LT1376HVCS8#PBF equivalent, key selection criteria include input voltage headroom (up to 25V), thermal performance in SO-8 (θJA = 120–150°C/W), cycle-by-cycle current limiting, and BIAS pin efficiency optimization for VIN ≥ 7.5V.
Technical Context
The LT1376HVCS8#PBF implements constant-frequency current-mode control with internal 500kHz oscillator, error amplifier (gm = 2000 µMho), and peak-current comparator referenced to VC pin. Its bipolar NPN power switch is driven via external BOOST capacitor to achieve 0.4Ω on-resistance and >87% efficiency at full load.
It integrates undervoltage lockout (2.38V on SHDN), dual-threshold shutdown (0.37V active, 2.38V standby), and FB/SENSE pin foldback protection-reducing switching frequency and current limit when output collapses below 1.7V or 1.0V respectively-to manage fault dissipation in battery charger and distributed power applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±1.2% (guaranteed over temperature and line) |
| Input Voltage Range | 6V to 25V (HV version supports up to 25V continuous, 30V absolute max) |
| Switch Current Limit | 1.5A at ≤50% duty cycle; derates to 1.35A at 80% duty cycle |
| Quiescent Supply Current | 2.5mA typical (enables low-power operation in battery systems) |
| Shutdown Current | 20µA typical (reduces system standby drain in portable devices) |
| Switching Frequency | 500kHz ±10% (enables use of 5–10µH inductors and compact ceramic output caps) |
| Package Thermal Resistance | θJA = 120–150°C/W (layout-dependent; fused-corner grounding recommended) |
Pinout & Package
LT1376HVCS8#PBF is housed in an 8-lead plastic SOIC (S8) package with exposed pad not present; thermal performance depends on PCB copper area and corner-pin grounding per Linear's layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST | Switch driver boost supply | Accepts external capacitor-diode network to generate VIN+5V drive; enables 0.4Ω saturated NPN switch conduction |
| VIN | Power switch collector & bias source | Supplies internal circuitry; high di/dt node requiring local 100µF solid tantalum bypass |
| VSW | Switch emitter | Connects to inductor; swings negative during off-time-requires catch diode clamping to −0.8V max |
| BIAS | Efficiency-optimized bias rail | When tied to regulated 5V output, shifts internal bias current from VIN to VOUT, improving efficiency at high VIN/light loads |
| FB/SENSE | Output voltage sense / fault monitor | Direct connection to 5V output; triggers foldback current limit below 1.7V and frequency reduction below 1.0V |
| VC | Error amplifier output / current limit setpoint | Provides 0.9–2.1V control range; used for compensation and optional override; clamp-limited to prevent latch-up |
| GND | Reference and return path | Must be short-traced to load ground to avoid load regulation error; carries narrow EMI spikes from VSW coupling |
| SHDN | Enable/disable control | Logic-compatible input: <0.37V disables switching; <0.15V forces micropower shutdown (20µA) |
Key Features
| Feature | Design Value |
|---|---|
| High-efficiency saturating switch | 0.4Ω on-resistance achieved via BOOST-pin drive, enabling >87% efficiency at 1A/5V with 10µH inductor |
| Integrated fault protection | Cycle-by-cycle current limiting + thermal shutdown + dual-threshold SHDN (UVLO + deep shutdown) |
| Dynamic foldback protection | FB/SENSE pin reduces switch current limit below 1.7V and cuts frequency 5:1 below 1.0V during short-circuit |
| BIAS pin efficiency enhancement | Redirects internal bias current from VIN to VOUT, delivering >10% efficiency gain at VIN=20V, IOUT=25mA |
| Compact magnetics support | 500kHz operation allows 5–10µH surface-mount inductors, reducing board area vs. lower-frequency alternatives |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Powering 5V logic rails and peripherals in clamshell notebooks with Li-ion input (8–16V). IC Role / Device Role / Timing Role: Primary 5V buck converter regulating CPU I/O, USB ports, and display interface supplies. Use Value: 2.5mA quiescent current extends battery runtime; BIAS pin improves efficiency during light-load sleep states. |
Use Scenario: Providing stable 5V supply for handheld test instruments powered by 4×AA alkaline cells (6–9V fresh). IC Role / Device Role / Timing Role: Main DC/DC regulator converting variable battery voltage to regulated 5V for microcontroller and analog front-end. Use Value: Wide 6–25V input range accommodates full battery discharge curve; foldback protection prevents thermal runaway during probe shorts. |
| Battery Charger Control | Distributed Power Architecture |
Use Scenario: Generating 5V auxiliary rail in multi-cell Li-ion fast-chargers to power fuel gauges and communication ICs. IC Role / Device Role / Timing Role: Secondary regulator fed from main charger IC's intermediate bus (12–19V). Use Value: 25V absolute max input withstands transient overshoots; 20µA shutdown current minimizes parasitic drain on charged packs. |
Use Scenario: Local point-of-load conversion in industrial PLC backplanes where 24V bus powers isolated 5V I/O modules. IC Role / Device Role / Timing Role: Compact, thermally robust buck stage delivering 1.25A at 5V per module slot. Use Value: SO-8 package with fused-corner grounding meets IPC-2221 thermal requirements; current-mode control ensures stability across varying bus impedance. |
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 | 4MHz synchronous buck, 3A, integrated MOSFETs, 2.7–5.5V input | Requires lower input voltage; targets space-constrained, high-efficiency apps-not HV replacement | Select only if input stays ≤5.5V and 4MHz switching is acceptable for noise-sensitive analog sections |
| TPS54202DRCT | 2.5A synchronous buck, 4.5–28V input, 500kHz, integrated FETs, no BOOST pin | Higher current, wider VIN, but lacks BOOST-assisted saturation-lower efficiency at high VIN | Prefer when >1.5A load or simplified layout (no BOOST cap/diode) outweighs 3–5% efficiency loss at VIN >15V |
Compared with LTC3605EDE#PBF and TPS54202DRCT, LT1376HVCS8#PBF uniquely combines HV tolerance (25V), BOOST-enabled saturation efficiency, and proven ruggedness in legacy industrial designs-making it optimal where input transients, thermal constraints, and field reliability dominate.
Availability
LT1376HVCS8#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, and distributed power systems requiring stable component supply with long-term industrial lifecycle support.
Supply support for LT1376HVCS8#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 support for its legacy power portfolio, including precision analog and high-reliability DC/DC regulators.
The LT1376HVCS8#PBF belongs to Linear's monolithic current-mode buck regulator family, designed specifically for high-efficiency, thermally constrained applications in portable and industrial equipment where input voltage headroom and fault resilience are critical.
FAQ
What is the maximum input voltage rating for LT1376HVCS8#PBF?
The LT1376HVCS8#PBF has an absolute maximum input voltage of 30V and a recommended operating range of 6V to 25V. This HV designation distinguishes it from standard LT1376 variants rated for 25V absolute max. Exceeding 25V in normal operation risks violating SO-8 thermal limits unless board layout provides aggressive heatsinking.
Does LT1376HVCS8#PBF require an external BOOST capacitor and diode?
Yes, LT1376HVCS8#PBF requires an external BOOST capacitor (typically 10nF ceramic) and Schottky diode (e.g., 1N5818) connected between VIN and BOOST pins. This network generates the boosted gate drive needed to saturate the internal NPN switch-omitting it degrades efficiency and increases switch losses beyond specification.
Can LT1376HVCS8#PBF operate without connecting the BIAS pin?
Yes, LT1376HVCS8#PBF functions normally with BIAS pin left unconnected or tied to GND; internal bias is then drawn from VIN. However, connecting BIAS to the regulated 5V output improves efficiency by 10%+ at high input voltages (e.g., VIN = 20V), making it strongly recommended for battery-powered or thermally sensitive applications.
What protection features does LT1376HVCS8#PBF include?
LT1376HVCS8#PBF integrates cycle-by-cycle current limiting, thermal shutdown, dual-threshold SHDN (0.37V active disable, 2.38V UVLO), and FB/SENSE pin foldback-reducing both switch current limit below 1.7V and switching frequency 5:1 below 1.0V. These features collectively prevent thermal runaway during sustained overload or output short conditions.
Is LT1376HVCS8#PBF pin-compatible with other LT1376 variants?
Yes, LT1376HVCS8#PBF shares identical 8-lead SOIC (S8) pinout and footprint with LT1376CS8#PBF and LT1376IS8#PBF. The HV suffix denotes extended input voltage rating only-electrical behavior, timing, and layout rules remain fully compatible, enabling drop-in replacement where higher input headroom is required.
LT1376HVCS8#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):
- 30V
- Voltage - Output (Min/Fixed):
- 2.42V
- Voltage - Output (Max):
- 25.8V
- 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
LT1376HVCS8#PBF FAQ
1.How can I place an order for LT1376HVCS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1376HVCS8#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 LT1376HVCS8#PBF reliable?
The price and inventory of LT1376HVCS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1376HVCS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1376HVCS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1376HVCS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1376HVCS8#PBF?
LT1376HVCS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1376HVCS8#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 LT1376HVCS8#PBF?
For technical support, including LT1376HVCS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1376HVCS8#PBF requirements.
6.How does Aetrix verify that LT1376HVCS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1376HVCS8#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 LT1376HVCS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1376HVCS8#PBF?
All LT1376HVCS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1376HVCS8#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 LT1376HVCS8#PBF part is unused and in its original packaging.
Return procedure for LT1376HVCS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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