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Analog Devices Inc. LT1576CS8-5#TRPBF
- Part No.:
- LT1576CS8-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1576CS8-5#TRPBF.pdf
- Description:
- IC REG BUCK 5V 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,948
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Product details
Overview
LT1576CS8-5#TRPBF from Analog Devices (formerly Linear Technology) is a fixed 5V, 1.25A monolithic step-down switching regulator in fused-lead SO-8 package. It features 200kHz constant-frequency current-mode control, 0.2Ω switch on-resistance, 1.21V internal reference, and integrated shutdown with 20µA quiescent current. Designed for battery-powered systems requiring stable 5V rail generation from 6V–25V input.
For engineers reviewing the LT1576CS8-5#TRPBF datasheet, LT1576CS8-5#TRPBF pinout, LT1576CS8-5#TRPBF application, or LT1576CS8-5#TRPBF equivalent, key selection criteria include fixed 5V output accuracy (±2%), cycle-by-cycle current limiting, BOOST pin drive capability for NPN saturation, fused ground thermal enhancement, and compatibility with surface-mount 15µH inductors.
Technical Context
The LT1576CS8-5#TRPBF implements current-mode control with an internal 1.21V reference and SENSE pin (replacing FB) for fixed 5V regulation. Its oscillator operates at 200kHz (±20kHz over temperature), with line regulation of 0.03%/V and frequency foldback below 0.7V SENSE voltage to limit power dissipation during short-circuit events.
It uses a fused-lead SO-8 package with dedicated GND pin routing to reduce thermal resistance (θJA = 80°C/W) and isolate high-dI/dt switching paths from low-noise control circuitry. The BOOST pin supplies >5V above VIN to saturate the on-chip NPN switch, achieving 0.2Ω typical on-resistance and >88% efficiency at 1A load.
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 (with 15µH inductor, VIN = 10V; derates at higher VIN or lower L) |
| Switching Frequency | 200kHz nominal (180–220kHz over temp); enables compact magnetics and predictable EMI profile |
| Input Voltage Range | 6V to 25V (minimum 5.5V guaranteed operation; supports 12V/24V industrial rails) |
| Switch On-Resistance | 0.2Ω typical (reduces conduction loss; enables >88% efficiency at 1A/5V out) |
| Shutdown Current | 20µA max (enables ultra-low-power standby in portable systems) |
| Reference Voltage | 1.21V ±1.2% (internal precision bandgap; sets SENSE threshold for 5V regulation) |
| Thermal Resistance | θJA = 80°C/W (fused ground lead improves heat transfer to PCB plane) |
Pinout & Package
Fused-lead 8-pin plastic SOIC (SO-8) package with exposed thermal pad connected to Pin 4 (GND); θJA = 80°C/W when fused GND tied to large copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch emitter node | Connects to inductor; driven to VIN during on-time; clamped negative by catch diode during off-time (max –0.8V) |
| 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) | Switch driver boost supply | Must be held ≥5V above VIN via external capacitor/diode; enables NPN saturation and 0.2Ω RON |
| GND (Pin 4) | Signal & power reference | Fused lead reduces thermal resistance; must tie directly to load return and input/output capacitors |
| BIAS (Pin 5) | Efficiency-boost bias input | Connect to regulated 5V output to reduce input supply current by ~10% at high VIN/light load |
| VC (Pin 6) | Error amplifier output / current limit control | Used for loop compensation; clamps at 2.1V; drives switch current comparator |
| SENSE (Pin 7) | Fixed-output voltage sense | Replaces FB on -5 variants; connects directly to 5V output; triggers foldback if <0.7V |
| SHDN (Pin 8) | Shutdown control | 0.37V threshold for micropower shutdown; 2.42V UVLO threshold disables switching |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V output option | Eliminates external feedback resistors; SENSE pin provides direct 5V regulation with ±2% accuracy |
| Fused-lead SO-8 package | Reduces θJA to 80°C/W vs. standard SO-8; extends ambient operating range without heatsink |
| BOOST pin architecture | Enables NPN saturation at high VIN, achieving 0.2Ω RON and >88% efficiency at full load |
| Frequency foldback protection | Reduces switching frequency 5:1 when SENSE <0.7V, limiting power dissipation during short-circuit faults |
| Current-mode control | Provides inherent cycle-by-cycle current limiting and fast transient response without external compensation |
| Low shutdown current | 20µA max shutdown current enables multi-week battery life in portable standby applications |
Applications
| Battery-Powered Portable Computers | Distributed Power Systems |
|---|---|
Use Scenario: Main 5V rail generation in laptop docking stations powered from 12V or 24V DC inputs. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 5V/1.25A to USB peripherals and logic subsystems. Use Value: Fused SO-8 thermal performance sustains full load at 60°C ambient; BOOST architecture maintains >85% efficiency across 12–24V input range. | Use Scenario: Local 5V conversion in industrial PLC backplanes fed from centralized 24V supply. IC Role / Device Role / Timing Role: Point-of-load regulator powering microcontrollers and I/O drivers with tight 5V tolerance. Use Value: Fixed 5V SENSE interface eliminates resistor drift errors; shutdown pin enables remote power sequencing control. |
| Battery Charger Auxiliary Supply | Portable Medical Monitoring Devices |
Use Scenario: Generating isolated 5V bias for charger controller ICs and status LEDs during lithium-ion charging cycles. IC Role / Device Role / Timing Role: Secondary regulator deriving 5V from main 12V/16.8V battery pack voltage. Use Value: 20µA shutdown current preserves battery charge between charging sessions; 6–25V input range accommodates varying pack states. | Use Scenario: Powering low-noise analog front-ends and Bluetooth radios in handheld ECG monitors. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying clean 5V rail to mixed-signal SoC and sensors. Use Value: Current-mode control minimizes output voltage deviation during rapid sensor sampling transients; fused GND reduces EMI coupling into analog sections. |
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 efficiency at light loads; smaller inductor size; requires different layout due to high-frequency operation | Select for space-constrained designs needing >90% efficiency and sub-1mm height inductors |
| TPS54202DRCT | 2.5A synchronous buck; 500kHz–2.2MHz adjustable frequency; integrated high-side FET | No external BOOST diode/capacitor needed; wider input range (4.5–28V); different pinout and compensation scheme | Select for designs requiring programmable frequency synchronization or tighter input voltage margin below 6V |
Compared with LTC3605EDE-5#TRPBF and TPS54202DRCT, the LT1576CS8-5#TRPBF offers superior thermal performance in SO-8 via fused ground, proven reliability in 200kHz industrial deployments, and simpler external component count-though it lacks synchronous rectification and requires external BOOST components.
Availability
LT1576CS8-5#TRPBF is available at Aetrix Electronics and suitable for battery-powered portable computers, distributed power systems, battery charger auxiliary supplies, and portable medical monitoring devices requiring stable component supply and long-term lifecycle support.
Supply support for LT1576CS8-5#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LT1576CS8-5#TRPBF belongs to Linear's legacy monolithic buck regulator product line, designed specifically for noise-sensitive industrial and portable applications requiring robust 5V conversion from wide-input rails with minimal external components.
FAQ
What is the output voltage tolerance of the LT1576CS8-5#TRPBF under full load and temperature?
The LT1576CS8-5#TRPBF delivers a fixed 5.0V output with ±2% tolerance over the full operating temperature range (0°C to 125°C) and load conditions up to 1.25A. This specification is guaranteed by the internal 1.21V reference (±1.2%) and matched on-die SENSE resistor network, eliminating external resistor drift errors that affect adjustable regulators.
Can the LT1576CS8-5#TRPBF operate with input voltages below 6V?
The LT1576CS8-5#TRPBF has a minimum guaranteed operating input voltage of 5.5V per Absolute Maximum Ratings, but stable 5V regulation requires ≥6V input under typical load conditions. At 5.5V input, output may drop below 4.9V at full 1.25A load due to dropout limitations of the BOOST-driven NPN switch; operation below 6V is not recommended for production designs.
Does the LT1576CS8-5#TRPBF require an external BOOST capacitor and diode?
Yes, the LT1576CS8-5#TRPBF requires an external BOOST capacitor (typically 10nF ceramic) and Schottky diode (e.g., 1N5818) connected between VIN and BOOST pins. This network generates the >5V-over-VIN drive voltage needed to saturate the internal NPN switch and achieve its specified 0.2Ω on-resistance and >88% efficiency.
How does the SENSE pin function differ from the FB pin on adjustable LT1576 variants?
On the LT1576CS8-5#TRPBF, Pin 7 is SENSE-not FB-and connects directly to the 5V output. It replaces the external resistor divider used on adjustable versions. Internally, it compares output voltage against a trimmed 1.21V reference to maintain regulation, while also triggering frequency and current foldback protection when voltage drops below 0.7V.
What thermal derating applies to the LT1576CS8-5#TRPBF at 70°C ambient?
At 70°C ambient with standard 2-layer PCB and fused GND tied to 2-in² copper pour, the LT1576CS8-5#TRPBF supports full 1.25A output current. Derating begins above 85°C ambient; maximum junction temperature remains 125°C, yielding ~0.9A continuous at 100°C ambient per thermal calculations using θJA = 80°C/W.
LT1576CS8-5#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
LT1576CS8-5#TRPBF FAQ
1.How can I place an order for LT1576CS8-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1576CS8-5#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 LT1576CS8-5#TRPBF reliable?
The price and inventory of LT1576CS8-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1576CS8-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1576CS8-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1576CS8-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1576CS8-5#TRPBF?
LT1576CS8-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1576CS8-5#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 LT1576CS8-5#TRPBF?
For technical support, including LT1576CS8-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1576CS8-5#TRPBF requirements.
6.How does Aetrix verify that LT1576CS8-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1576CS8-5#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 LT1576CS8-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1576CS8-5#TRPBF?
All LT1576CS8-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1576CS8-5#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 LT1576CS8-5#TRPBF part is unused and in its original packaging.
Return procedure for LT1576CS8-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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