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Analog Devices Inc. LT1576CS8-5SYNC#TRPBF
- Part No.:
- LT1576CS8-5SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1576CS8-5SYNC#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,924
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Product details
Overview
LT1576CS8-5SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.5A, 200kHz monolithic synchronous step-down switching regulator in fused-lead SO-8 package. It integrates a current-mode NPN power switch with 0.2Ω on-resistance, 1.21V internal reference, and SYNC pin for external clock synchronization. Designed for battery-powered systems requiring stable 5V rail with low EMI and high efficiency up to 88% at 1A.
For engineers reviewing the LT1576CS8-5SYNC#TRPBF datasheet, LT1576CS8-5SYNC#TRPBF pinout, LT1576CS8-5SYNC#TRPBF application, or LT1576CS8-5SYNC#TRPBF equivalent, key selection criteria include fixed 5V output accuracy (±2%), 200kHz switching frequency with ±20kHz tolerance, SYNC pin compatibility with 250–400kHz external clocks, and fused-ground thermal performance enabling 125°C junction operation.
Technical Context
The LT1576CS8-5SYNC#TRPBF implements constant-frequency current-mode control with cycle-by-cycle peak current limiting and slope compensation to prevent subharmonic oscillation. Its architecture uses an internal 1.21V reference and integrated error amplifier (1000 µMho transconductance) driving the VC pin to modulate switch duty cycle based on SENSE pin feedback.
Unlike adjustable variants, this -5SYNC version replaces FB with SENSE pin tied directly to output and SHDN with SYNC pin. The BOOST pin enables NPN saturation via external capacitor/diode, reducing switch loss and improving efficiency over standard bipolar buck regulators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (guaranteed 4.94–5.06V across all conditions) |
| Max Output Current | 1.25A continuous (1.5A switch rating derated per duty cycle; 1.25A at VOUT=5V, VIN=10V, L=33µH) |
| Switching Frequency | 200kHz nominal (180–220kHz over temp; synchronizable 250–400kHz via SYNC pin) |
| Input Voltage Range | 6V to 25V (minimum 5.5V guaranteed for regulation; 5V absolute minimum under specific conditions) |
| Switch On Resistance | 0.2Ω typical (measured at ISW = 1.5A; enables >88% efficiency at 1A/5V with proper layout) |
| Shutdown Current | 20µA max (at VSHDN = 0V; enables ultra-low quiescent power in sleep mode) |
| Reference Voltage | 1.21V ±1.2% (internal bandgap reference used for SENSE voltage comparison) |
| 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 (θJA = 80°C/W). Ground lead must be soldered to large copper area or ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch emitter terminal | Drives inductor; clamped negative during off-time by external catch diode; max –0.8V allowed |
| VIN (Pin 2) | Power switch collector & bias source | Supplies internal circuitry when BIAS pin is open; requires local 100µF solid tantalum bypass |
| BOOST (Pin 3) | Boost drive node | Connected to external capacitor/diode network to provide >VIN voltage for NPN saturation |
| GND (Pin 4) | Signal and power ground reference | Must be short-traced to load ground; fused lead reduces thermal resistance to PCB plane |
| BIAS (Pin 5) | Efficiency-boosting supply input | Connect to regulated 5V output to reduce input current draw and improve efficiency at high VIN |
| VC (Pin 6) | Error amplifier output / current limit control | Used for loop compensation; also serves as current clamp point; 0.8V threshold disables switching |
| SENSE (Pin 7) | Fixed-output voltage sense input | Direct connection to 5V output; triggers foldback if voltage drops below 0.7V (short-circuit protection) |
| SYNC (Pin 8) | External clock synchronization input | Logic-compatible input (10–90% duty); locks internal oscillator to 250–400kHz external signal |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output with SENSE pin | Eliminates external feedback resistors; ±2% accuracy ensures stable logic rail without calibration |
| Synchronization capability | Enables EMI reduction by locking switching frequency to system clock or avoiding sensitive bands |
| Fused ground lead in SO-8 | Reduces θJA to 80°C/W-enables full 1.25A output at 125°C junction temperature with proper PCB layout |
| Current-mode control with slope compensation | Provides inherent stability across wide input/output ranges and prevents subharmonic oscillation up to 90% duty cycle |
| Frequency and current foldback | Automatically reduces switching frequency and peak current limit when SENSE < 0.7V-limits power dissipation during short-circuit events |
| Low quiescent current | 1.16mA total input-referred supply current (VIN + BIAS) enables long battery life in portable applications |
Applications
| Battery-Powered Portable Computers | Distributed Power Systems |
|---|---|
Use Scenario: Regulating 5V rail from 6–25V battery stack (e.g., 2S–5S Li-ion) in ruggedized laptops or handheld terminals. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC converter delivering regulated 5V to CPU I/O, USB ports, and peripheral logic. Use Value: Fixed 5V output eliminates resistor matching errors; fused SO-8 package sustains 1.25A at 70°C ambient without heatsink. | Use Scenario: Local 5V conversion in industrial backplanes or telecom line cards where multiple point-of-load rails are required. IC Role / Device Role / Timing Role: Secondary buck regulator synchronized to system master clock to minimize conducted EMI coupling into shared power planes. Use Value: SYNC pin allows deterministic noise placement; 200kHz base frequency avoids AM radio band while enabling compact 15µH inductor. |
| Battery Charger Auxiliary Supply | Portable Medical Monitoring Devices |
Use Scenario: Generating isolated 5V auxiliary supply for charger controller ICs and status LEDs during fast-charge cycles. IC Role / Device Role / Timing Role: High-efficiency buck stage converting unregulated adapter output (e.g., 9–24V) to clean 5V for microcontroller and display backlight. Use Value: 88% peak efficiency reduces thermal load in sealed enclosures; shutdown current <50µA extends standby time between charges. | Use Scenario: Powering low-noise analog front-end (AFE), ADC, and Bluetooth LE radio in wearable ECG or pulse oximeters. IC Role / Device Role / Timing Role: Low-EMI 5V supply with synchronized switching to avoid interference with sensitive biopotential measurements. Use Value: Slope-compensated current-mode control ensures stable regulation under dynamic sensor load transients; folded-back short-circuit current protects against electrode fault conditions. |
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#TRPBF | 4MHz synchronous buck; 3A output; integrated MOSFETs; no BOOST pin required | Higher frequency enables smaller inductors/caps but increases switching loss at high VIN | Select for space-constrained designs needing >1.25A or synchronous rectification; not drop-in due to different pinout and control scheme |
| TPS54202DDCR | 2.5–17V input; 2A output; 500kHz–2.2MHz adjustable frequency; integrated FETs | Requires external feedback resistors for 5V; no fused thermal path; higher IQ (47µA) | Select for cost-sensitive industrial apps where 5V accuracy ±3% is acceptable and layout allows larger thermal pad |
Compared with LTC3605EDE-5#TRPBF and TPS54202DDCR, the LT1576CS8-5SYNC#TRPBF offers superior thermal performance via fused SO-8, deterministic EMI control through SYNC pin, and proven robustness in battery-input environments-but requires external BOOST diode/capacitor and delivers lower peak current.
Availability
LT1576CS8-5SYNC#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable computers, distributed power systems, and medical monitoring devices requiring stable component supply with guaranteed long-term availability.
Supply support for LT1576CS8-5SYNC#TRPBF 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through acquisition of Linear Technology in 2017.
The LT1576CS8-5SYNC#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, designed specifically for noise-sensitive, high-reliability DC/DC conversion in portable and industrial equipment where thermal robustness and EMI control are critical.
FAQ
What is the guaranteed output voltage accuracy of the LT1576CS8-5SYNC#TRPBF?
The LT1576CS8-5SYNC#TRPBF guarantees a fixed 5V output with ±2% accuracy (4.94V to 5.06V) across all operating conditions including temperature, line, and load variations. This specification is verified per the Electrical Characteristics table in the official datasheet, where SENSE pin voltage is measured at 5.0V typical with min/max bounds of 4.94V and 5.06V under all conditions.
Can the LT1576CS8-5SYNC#TRPBF operate with input voltage below 6V?
The LT1576CS8-5SYNC#TRPBF has a specified minimum input voltage of 6V, but the datasheet notes a guaranteed minimum of 5.5V for regulation and an absolute minimum of 5.0V under certain test conditions. Operation below 6V is possible only if the output load is light and VIN remains above the minimum boost voltage (≥2.3V across BOOST capacitor), though regulation margin and efficiency degrade significantly below 6V.
How does the SYNC pin on the LT1576CS8-5SYNC#TRPBF function in practice?
The SYNC pin on the LT1576CS8-5SYNC#TRPBF accepts logic-level signals (10–90% duty cycle) to lock the internal 200kHz oscillator to an external clock within 250–400kHz range. When active, it overrides the internal oscillator and forces exact frequency alignment-critical for EMI reduction in systems with multiple switching regulators or sensitive RF sections. During sync, foldback protection remains fully functional.
What is the purpose of the fused ground lead in the LT1576CS8-5SYNC#TRPBF SO-8 package?
The fused ground lead in the LT1576CS8-5SYNC#TRPBF SO-8 package is a dedicated, low-thermal-resistance connection between the die substrate and the PCB ground plane. It reduces θJA to 80°C/W-enabling full 1.25A output at 125°C junction temperature when soldered to ≥1 sq-in copper area-unlike standard SO-8 packages which typically exceed 150°C/W.
Does the LT1576CS8-5SYNC#TRPBF require an external BOOST capacitor and diode?
Yes, the LT1576CS8-5SYNC#TRPBF requires an external BOOST capacitor (typically 10nF ceramic) and diode (e.g., 1N5818) connected between VIN and BOOST pins. This network generates a voltage >VIN to saturate the internal NPN switch, achieving 0.2Ω on-resistance and >88% efficiency. Omitting these components results in excessive switch loss and thermal failure under load.
LT1576CS8-5SYNC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1576CS8-5SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1576CS8-5SYNC#TRPBF 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#TRPBF reliable?
The price and inventory of LT1576CS8-5SYNC#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1576CS8-5SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1576CS8-5SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1576CS8-5SYNC#TRPBF?
LT1576CS8-5SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1576CS8-5SYNC#TRPBF 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#TRPBF?
For technical support, including LT1576CS8-5SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1576CS8-5SYNC#TRPBF requirements.
6.How does Aetrix verify that LT1576CS8-5SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1576CS8-5SYNC#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1576CS8-5SYNC#TRPBF?
All LT1576CS8-5SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1576CS8-5SYNC#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1576CS8-5SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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