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Analog Devices Inc. LT1576IS8-5SYNC#PBF
- Part No.:
- LT1576IS8-5SYNC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1576IS8-5SYNC#PBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,993
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Product details
Overview
LT1576IS8-5SYNC#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.5A monolithic synchronous step-down switching regulator in fused-lead SO-8 package. It operates at 200kHz constant frequency, features cycle-by-cycle current limiting, 0.2Ω switch on-resistance, and integrated synchronization capability via SYNC pin. It delivers stable 5V output from 6V–25V input for portable computers and battery-powered systems.
For engineers reviewing the LT1576IS8-5SYNC#PBF datasheet, LT1576IS8-5SYNC#PBF pinout, LT1576IS8-5SYNC#PBF application, or LT1576IS8-5SYNC#PBF equivalent, key selection criteria include its fixed 5V output with ±1.2% accuracy, 20µA shutdown current, fused-ground thermal enhancement, and SYNC-enabled frequency coordination in multi-rail power systems.
Technical Context
The LT1576IS8-5SYNC#PBF implements current-mode control with internal 1.21V reference and slope compensation to prevent subharmonic oscillation. Its architecture integrates a 1.5A NPN power switch, BOOST-driven saturation circuitry, and dual-threshold shutdown logic (2.42V UVLO / 0.37V deep shutdown).
It replaces FB with SENSE for fixed 5V operation and substitutes SHDN with SYNC for external clock alignment up to 400kHz. The fused SO-8 package reduces θJA to 80°C/W when connected to ground plane, enabling operation from –40°C to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.2% (SENSE pin monitors output directly; no external divider required) |
| Switching Frequency | 200kHz nominal; synchronizable from 250kHz to 400kHz via SYNC pin |
| Max Output Current | 1.25A continuous at VOUT=5V, VIN=10V, L=33µH (derates with higher VIN or smaller inductor) |
| Switch On Resistance | 0.2Ω typical (enables >88% efficiency vs. ~75% in conventional bipolar buck) |
| Shutdown Current | 20µA max (reduces system standby power in battery applications) |
| Input Voltage Range | 6V to 25V (minimum running voltage is 5.5V at full load; startup requires ≥5.0V) |
| Thermal Resistance | θJA = 80°C/W with fused ground pin connected to PCB ground plane |
Pinout & Package
Fused-lead 8-pin plastic SOIC (SO-8) package with exposed fused ground lead for enhanced thermal performance and EMI reduction. Pin 4 (GND) is thermally and electrically bonded to large copper area for low-impedance return path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch emitter node | Connects to inductor; clamped negative swing ≤ –0.8V by catch diode; high dI/dt node requiring short trace routing |
| VIN (Pin 2) | Power switch collector & bias source | Supplies internal circuitry when BIAS pin is open; high-current input path requiring local 100µF tantalum bypass |
| BOOST (Pin 3) | Switch drive voltage booster | Connected to VIN + diode + capacitor; enables NPN saturation, reducing conduction loss to FET-equivalent level |
| GND (Pin 4) | Reference and thermal ground | Fused lead must connect to ground plane; serves as output regulation reference and primary EMI current return path |
| BIAS (Pin 5) | Efficiency-optimized bias supply | Connect to regulated 5V output to reduce total input current by ~10% at VIN=20V, IOUT=25mA |
| VC (Pin 6) | Error amplifier output & current limit control | Used for loop compensation; voltage range 0.8V–2.1V; drives switch current threshold; can be clamped for override |
| SENSE (Pin 7) | Fixed-output voltage sense input | Direct connection to 5V output; triggers foldback current limit and frequency reduction if voltage drops below 0.7V |
| SYNC (Pin 8) | External oscillator synchronization input | Logic-compatible input (10–90% duty); disables internal oscillator when driven; replaces SHDN function in -SYNC variants |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with internal resistor divider | Eliminates external feedback resistors; SENSE pin provides direct output monitoring for fast fault response |
| Synchronization capability | Enables precise timing coordination across multiple regulators to suppress beat frequencies and reduce EMI in multi-rail systems |
| Fused SO-8 thermal design | Reduces junction-to-ambient thermal resistance by ~30% vs. standard SO-8, extending usable ambient temperature range |
| Cycle-by-cycle current limiting | Guarantees switch protection under transient overloads without external sensing components |
| Frequency and current foldback | Automatically reduces switching frequency and peak current during short-circuit or low-VOUT conditions to limit IC and external component power dissipation |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Core voltage regulation for embedded controllers and peripherals in clamshell notebooks with limited board space and thermal budget. IC Role / Device Role / Timing Role: Primary 5V buck converter supplying USB ports, display logic, and sensor interfaces; synchronized to system clock to minimize noise coupling into analog sections. Use Value: Fused SO-8 package maintains <125°C junction temperature at 1.25A load; 20µA shutdown current extends battery runtime during sleep states. | Use Scenario: Power management in handheld test equipment operating from single Li-ion cell (8.4V–12.6V) with strict EMI limits. IC Role / Device Role / Timing Role: Main 5V rail generator with BOOST-assisted saturation ensuring >88% efficiency across full input range; SYNC pin aligned to MCU timer to avoid spectral interference. Use Value: 0.2Ω switch RDS(on)-equivalent conduction loss minimizes heat generation in sealed enclosure; foldback protection prevents thermal runaway during probe short events. |
| Battery Charger | Distributed Power |
Use Scenario: Auxiliary 5V supply for charger controller ICs and status LEDs in multi-bay Li-ion charging stations. IC Role / Device Role / Timing Role: Secondary regulated rail derived from 24V DC bus; uses BIAS pin tied to 5V output to improve light-load efficiency by 10% at 25mA. Use Value: 200kHz fixed frequency simplifies EMI filter design; fused ground pin ensures stable regulation despite shared ground paths with high-current charging circuits. | Use Scenario: Point-of-load conversion in industrial I/O modules requiring isolated 5V rails synchronized across multiple slots. IC Role / Device Role / Timing Role: Slot-local 5V regulator synchronized via backplane SYNC signal to eliminate inter-slot beat frequencies and ensure deterministic power sequencing. Use Value: SYNC input tolerance up to 400kHz allows compatibility with common system clocks; 1.5A rating supports hot-swap transients without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE-5#PBF | 4MHz constant-frequency operation; integrated MOSFETs; 3mm × 3mm DFN package; 95% peak efficiency | Higher switching frequency enables smaller inductors/capacitors but increases switching losses above 1A | Select for space-constrained designs needing ultra-compact layout; not drop-in due to different pinout and control interface |
| TPS5430DDAR | 3.5A output capability; adjustable output (0.8V–30V); SO-8 package; 500kHz default frequency | Requires external feedback resistors; lacks SYNC functionality; higher quiescent current (5.5mA) | Select when higher current or adjustable output is needed; use only if fixed 5V is set externally and synchronization is unnecessary |
Compared with LTC3605EDE-5#PBF and TPS5430DDAR, the LT1576IS8-5SYNC#PBF offers superior thermal performance in SO-8 via fused ground, lower shutdown current for battery longevity, and native SYNC support-making it optimal for noise-sensitive, thermally constrained, multi-regulator systems requiring precise timing alignment.
Availability
LT1576IS8-5SYNC#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered systems, and distributed power architectures requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LT1576IS8-5SYNC#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 products including the LT1576 family.
The LT1576 product line was designed specifically for noise-sensitive, thermally demanding DC/DC conversion in portable and industrial applications-emphasizing EMI reduction, fused thermal packaging, and robust fault protection without external components.
FAQ
What is the output voltage tolerance of the LT1576IS8-5SYNC#PBF under full temperature and load range?
The LT1576IS8-5SYNC#PBF guarantees a fixed 5.0V output with ±1.2% accuracy over –40°C to 125°C junction temperature and full load range. This specification is confirmed in the Electrical Characteristics table under "Sense Voltage (Fixed 5V)" with min/max values of 4.94V and 5.06V at all conditions, and 4.90V–5.10V over full temperature range. The SENSE pin directly monitors the output, eliminating resistor-divider drift errors inherent in adjustable regulators.
Can the LT1576IS8-5SYNC#PBF operate without the BOOST capacitor and diode?
No-the LT1576IS8-5SYNC#PBF requires the external BOOST capacitor and diode to achieve its specified 0.2Ω switch on-resistance and >88% efficiency. Without BOOST, the internal NPN switch operates in linear mode with ~1.5V VCE(sat), degrading efficiency to ~75% and risking thermal overload at full load. The BOOST circuit elevates gate drive above VIN, enabling saturation and minimizing conduction loss.
What happens to the LT1576IS8-5SYNC#PBF during a short-circuit event on the 5V output?
During a short-circuit, the LT1576IS8-5SYNC#PBF activates dual foldback protection: when SENSE pin voltage falls below 0.7V, switching frequency reduces from 200kHz to ~40kHz and peak switch current limits decrease from 1.5A to <0.77A. This coordinated action-documented in the Frequency Foldback graph and Applications Information-limits power dissipation in both the IC and external components while maintaining regulation integrity until fault clearance.
Is the LT1576IS8-5SYNC#PBF pin-compatible with the LT1576IS8-5#PBF?
Yes-the LT1576IS8-5SYNC#PBF is pin-compatible with the LT1576IS8-5#PBF, differing only in function of Pin 8: SHDN (shutdown enable) in the -5 variant versus SYNC (oscillator synchronization) in the -5SYNC variant. All other pins (VSW, VIN, BOOST, GND, BIAS, VC, SENSE) retain identical functions and electrical characteristics. No PCB layout change is required when upgrading from -5 to -5SYNC for synchronization capability.
How does the fused ground lead in the SO-8 package improve thermal performance of the LT1576IS8-5SYNC#PBF?
The fused ground lead in the LT1576IS8-5SYNC#PBF's SO-8 package reduces thermal resistance from junction to ambient (θJA) to 80°C/W when soldered to a PCB ground plane-approximately 30% lower than standard SO-8 packages. This fused connection provides low-impedance thermal and electrical paths, allowing the device to sustain 1.25A continuous output at 125°C junction temperature without derating, critical for compact, sealed, or high-ambient industrial enclosures.
LT1576IS8-5SYNC#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
- 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
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1576IS8-5SYNC#PBF FAQ
1.How can I place an order for LT1576IS8-5SYNC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1576IS8-5SYNC#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 LT1576IS8-5SYNC#PBF reliable?
The price and inventory of LT1576IS8-5SYNC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1576IS8-5SYNC#PBF is usually 5 days.
3.What payment methods are accepted for LT1576IS8-5SYNC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1576IS8-5SYNC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1576IS8-5SYNC#PBF?
LT1576IS8-5SYNC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1576IS8-5SYNC#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 LT1576IS8-5SYNC#PBF?
For technical support, including LT1576IS8-5SYNC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1576IS8-5SYNC#PBF requirements.
6.How does Aetrix verify that LT1576IS8-5SYNC#PBF is sourced from the original manufacturer or authorized distributors?
All LT1576IS8-5SYNC#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 LT1576IS8-5SYNC#PBF meets industry standards.
7.What is the process for return or replacement of LT1576IS8-5SYNC#PBF?
All LT1576IS8-5SYNC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1576IS8-5SYNC#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 LT1576IS8-5SYNC#PBF part is unused and in its original packaging.
Return procedure for LT1576IS8-5SYNC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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