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Analog Devices Inc. LT1576CS8-5SYNC#PBF
- Part No.:
- LT1576CS8-5SYNC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1576CS8-5SYNC#PBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,970
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Product details
Overview
LT1576CS8-5SYNC#PBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.25A monolithic synchronous step-down switching regulator in fused-lead SO-8 package, featuring 200kHz constant-frequency current-mode control, integrated 1.5A NPN power switch with 0.2Ω on-resistance, and SYNC pin for external clock synchronization-designed for portable computers and battery-powered systems requiring stable 5V rail generation from 6V–25V input.
For engineers reviewing the LT1576CS8-5SYNC#PBF datasheet, LT1576CS8-5SYNC#PBF pinout, LT1576CS8-5SYNC#PBF application, or LT1576CS8-5SYNC#PBF equivalent, key selection criteria include its fixed 5V output (±2% tolerance), 20µA shutdown current, fused-ground thermal enhancement, cycle-by-cycle current limiting, and synchronization capability up to 400kHz-critical for noise-sensitive, multi-rail embedded power designs.
Technical Context
The LT1576CS8-5SYNC#PBF implements a current-mode buck topology with internal 1.21V reference and dedicated SENSE pin (replacing FB) for fixed 5V regulation. Its oscillator operates at 200kHz nominal frequency with ±20kHz line regulation and supports external synchronization via logic-compatible SYNC pin (10–90% duty cycle, 250–400kHz range).
Control architecture includes dual comparators: one for peak-current limiting (1.5A typical, foldback to <0.77A under short-circuit), another for undervoltage lockout (2.42V threshold) and micropower shutdown (0.37V threshold). The fused SO-8 package reduces θJA to 80°C/W when grounded to PCB plane, enabling operation up to 125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (SENSE pin referenced; no external divider required) |
| Max Output Current | 1.25A continuous (at VIN = 10V, L = 33µH, TA ≤ 85°C) |
| Switching Frequency | 200kHz nominal; synchronizable from 250kHz to 400kHz via SYNC pin |
| Input Voltage Range | 6V to 25V (minimum start-up voltage 5.5V; boost capacitor required ≥2.3V) |
| Switch On Resistance | 0.2Ω typical (enables >88% efficiency at 5V/1A, VIN=12V) |
| Shutdown Current | 20µA max (enables ultra-low-power standby in battery systems) |
| Thermal Resistance | θJA = 80°C/W (achieved via fused ground lead connected to PCB ground plane) |
Pinout & Package
Fused-lead 8-pin plastic SOIC (SO-8) package with exposed fused ground lead for enhanced thermal dissipation; pin 4 (GND) must be connected directly to large copper area or ground plane to achieve rated θJA = 80°C/W and full 125°C junction operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch emitter node | Connects to inductor; clamped negative swing ≤ –0.8V by external catch diode; high dI/dt node requiring short layout |
| VIN (Pin 2) | Power switch collector & bias source | Supplies internal circuitry when BIAS pin is open; requires local 100µF tantalum bypass near pin |
| BOOST (Pin 3) | Bootstrap drive voltage source | Must be held ≥VIN + 2.3V via external capacitor/diode; enables NPN saturation and low conduction loss |
| GND (Pin 4) | Reference and thermal path | Fused lead must connect to ground plane; serves as output voltage reference and EMI return path |
| BIAS (Pin 5) | Efficiency-boosting auxiliary supply | Connect to regulated 5V output to reduce total input current by ~10% at high VIN/light load |
| VC (Pin 6) | Error amplifier output & current limit setpoint | Used for loop compensation; also functions as current clamp input (0.8V threshold disables switching) |
| SENSE (Pin 7) | Fixed-output voltage sense input | Direct connection to 5V output; triggers frequency/current foldback if voltage drops below 0.7V |
| SYNC (Pin 8) | External clock synchronization input | Replaces SHDN function; accepts logic-level signal (10–90% duty cycle); disables foldback during sync mode |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with internal resistor divider | Eliminates external feedback resistors; guarantees ±2% accuracy over temperature and line |
| Synchronization capability up to 400kHz | Enables deterministic EMI reduction and multi-regulator phase alignment in dense PCB layouts |
| Fused SO-8 thermal design | Reduces θJA by ~30% vs standard SO-8, supporting 1.25A continuous output at 85°C ambient |
| Cycle-by-cycle current limiting with foldback | Protects IC and external components during short-circuit: limits peak current to <0.77A and reduces frequency 5:1 |
| BOOST-driven saturated NPN switch | Delivers 0.2Ω effective on-resistance-matching MOSFET performance while retaining bipolar robustness |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Generating clean 5V rail for USB peripherals and I/O controllers in clamshell laptops with 12V–19V adapter input. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V at up to 1.25A with tight transient response and low quiescent current. Use Value: Fused SO-8 thermal design sustains full load at elevated ambient; 20µA shutdown extends battery life during sleep states. | Use Scenario: Powering microcontroller, display, and sensors in handheld test equipment powered by 3S Li-ion (9–12.6V). IC Role / Device Role / Timing Role: Fixed-output DC/DC regulator providing stable 5V supply independent of battery discharge curve. Use Value: 200kHz switching enables compact 15µH inductor; BOOST pin ensures high efficiency (>88%) across full battery voltage range. |
| Battery Charger Auxiliary Rail | Distributed Power Architectures |
Use Scenario: Supplying isolated 5V logic power for charge management ICs and status LEDs in multi-bay smart chargers. IC Role / Device Role / Timing Role: Secondary regulated rail generator synchronized to main charger controller clock to minimize conducted EMI. Use Value: SYNC pin allows deterministic 200kHz–400kHz operation, avoiding beat frequencies with primary switching stages. | Use Scenario: Local point-of-load conversion in industrial PLC backplanes where 12V or 24V bus powers multiple 5V subsystems. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator placed near load to minimize IR drop and improve regulation. Use Value: Fused ground lead and SO-8 footprint simplify thermal management in constrained board areas without heatsinks. |
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 | 4mm × 3mm DFN-12, 3MHz switching, 1.5A, integrated MOSFETs, no BOOST pin | Higher frequency enables smaller LC filter; lacks BOOST-based saturation for ultra-low dropout | Choose LTC3605EDE-5#PBF for space-constrained designs needing higher frequency and lower profile; retain LT1576CS8-5SYNC#PBF for high-efficiency 200kHz operation with proven thermal robustness. |
| TPS54202DDCR | 6-pin SOT-23, 4.5–28V input, 5V fixed, 2A, integrated FETs, no SYNC or BOOST | Higher current rating but no synchronization capability; uses current-mode control without slope compensation | Choose TPS54202DDCR for cost-sensitive, low-current applications without EMI synchronization needs; retain LT1576CS8-5SYNC#PBF when fused-lead thermal performance and precise 200kHz sync are required. |
Compared with LTC3605EDE-5#PBF and TPS54202DDCR, the LT1576CS8-5SYNC#PBF uniquely combines fused-lead SO-8 thermal management, BOOST-enabled bipolar saturation for high efficiency at medium frequency, and deterministic SYNC capability-making it optimal for ruggedized, noise-controlled 5V power delivery where layout simplicity and thermal margin outweigh ultra-small footprint demands.
Availability
LT1576CS8-5SYNC#PBF is available at Aetrix Electronics and suitable for portable computers, battery-powered instrumentation, battery charger auxiliary rails, and distributed power architectures requiring stable component supply with guaranteed long-term availability.
Supply support for LT1576CS8-5SYNC#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision, industrial, automotive, and communications markets.
The LT1576 product line was designed specifically for noise-sensitive, high-efficiency DC/DC conversion in portable and battery-operated systems-emphasizing low EMI, thermal resilience, and simplified bill-of-materials through integrated BOOST and fused-package innovation.
FAQ
What is the output voltage tolerance of the LT1576CS8-5SYNC#PBF?
The LT1576CS8-5SYNC#PBF provides a fixed 5.0V output with ±2% tolerance over temperature, line, and load conditions. This specification is guaranteed by internal laser-trimmed resistor networks connected to the SENSE pin, eliminating external feedback components and ensuring stability without calibration. The LT1576CS8-5SYNC#PBF achieves this accuracy across its full operating junction temperature range of 0°C to 125°C and input voltage range of 6V to 25V.
Does the LT1576CS8-5SYNC#PBF require an external BOOST capacitor?
Yes, the LT1576CS8-5SYNC#PBF requires an external BOOST capacitor (typically 100nF ceramic) connected between BOOST (Pin 3) and VIN (Pin 2) via a Schottky diode (e.g., 1N5818). This network generates a voltage ≥VIN + 2.3V to saturate the internal NPN power switch, reducing conduction loss and enabling >88% efficiency. Without proper BOOST implementation, the LT1576CS8-5SYNC#PBF will exhibit excessive switch voltage drop and thermal stress.
How does the SYNC pin function on the LT1576CS8-5SYNC#PBF?
The SYNC pin (Pin 8) on the LT1576CS8-5SYNC#PBF accepts logic-level signals (10–90% duty cycle) to synchronize the internal 200kHz oscillator across a 250–400kHz range. During synchronization, the LT1576CS8-5SYNC#PBF disables its internal frequency foldback protection to maintain deterministic timing. The SYNC pin replaces the SHDN function found on non-SYNC variants, so external shutdown must be implemented via VC pin clamping or upstream enable control.
What is the maximum continuous output current for the LT1576CS8-5SYNC#PBF?
The LT1576CS8-5SYNC#PBF delivers up to 1.25A continuous output current under typical conditions: VIN = 10V, VOUT = 5V, L = 33µH, TA ≤ 85°C, with fused ground lead connected to PCB ground plane. At higher input voltages (e.g., 25V), maximum current decreases to ~0.94A due to increased inductor ripple current. Derating is required above 85°C ambient; full 1.25A is maintained only up to 125°C junction temperature with proper thermal design.
Can the LT1576CS8-5SYNC#PBF operate without the BIAS pin connection?
Yes, the LT1576CS8-5SYNC#PBF operates fully without BIAS pin connection-the internal bias regulator draws power from VIN (Pin 2) by default. However, connecting BIAS to the regulated 5V output improves efficiency by ~10% at high input voltages (e.g., VIN = 20V) and light loads (e.g., IOUT = 25mA), as it shifts most internal supply current from the high-voltage input rail to the low-voltage output rail. The minimum viable output voltage for BIAS operation is 3.3V.
LT1576CS8-5SYNC#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:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1576CS8-5SYNC#PBF FAQ
1.How can I place an order for LT1576CS8-5SYNC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1576CS8-5SYNC#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 LT1576CS8-5SYNC#PBF reliable?
The price and inventory of LT1576CS8-5SYNC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1576CS8-5SYNC#PBF is usually 5 days.
3.What payment methods are accepted for LT1576CS8-5SYNC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1576CS8-5SYNC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1576CS8-5SYNC#PBF?
LT1576CS8-5SYNC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1576CS8-5SYNC#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 LT1576CS8-5SYNC#PBF?
For technical support, including LT1576CS8-5SYNC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1576CS8-5SYNC#PBF requirements.
6.How does Aetrix verify that LT1576CS8-5SYNC#PBF is sourced from the original manufacturer or authorized distributors?
All LT1576CS8-5SYNC#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 LT1576CS8-5SYNC#PBF meets industry standards.
7.What is the process for return or replacement of LT1576CS8-5SYNC#PBF?
All LT1576CS8-5SYNC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1576CS8-5SYNC#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 LT1576CS8-5SYNC#PBF part is unused and in its original packaging.
Return procedure for LT1576CS8-5SYNC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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