My Inquiry
My Account
Analog Devices Inc. LT1576CS8-SYNC#TRPBF
- Part No.:
- LT1576CS8-SYNC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1576CS8-SYNC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 1.5A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,693
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1576CS8-SYNC#TRPBF from Analog Devices (formerly Linear Technology) is a 200kHz monolithic synchronous step-down switching regulator with integrated 1.5A NPN power switch, fixed 5V output, and external synchronization capability. It operates from 6V to 25V input, delivers up to 1.25A at 5V, features 1.21V internal reference, cycle-by-cycle current limiting, and fused-lead SO-8 package optimized for noise-sensitive portable computing and battery-powered systems.
For engineers reviewing the LT1576CS8-SYNC#TRPBF datasheet, LT1576CS8-SYNC#TRPBF pinout, LT1576CS8-SYNC#TRPBF application, or LT1576CS8-SYNC#TRPBF equivalent, key selection considerations include its 200kHz constant-frequency current-mode architecture, SYNC pin replacing SHDN for external clock alignment, 0.2Ω typical switch on-resistance, 20µA shutdown current, and compatibility with surface-mount 15µH inductors and solid tantalum output capacitors.
Technical Context
The LT1576CS8-SYNC#TRPBF implements a current-mode buck topology with internal 200kHz oscillator, error amplifier transconductance of 1000µMho, and slope-compensated peak-current control for stable loop dynamics across wide load and input ranges. Its BOOST pin enables saturation of the on-die NPN switch via external capacitor-diode network, reducing conduction loss and improving efficiency to >88% at 5V/1A.
Unlike standard buck controllers, this variant replaces the SHDN pin with SYNC functionality-accepting logic-compatible external clocks from 250kHz to 400kHz-while retaining undervoltage lockout (2.42V), foldback current limiting below 0.7V FB voltage, and BIAS pin support for efficiency optimization at high VIN-to-VOUT ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 25V - supports wide industrial and automotive battery inputs without pre-regulation |
| Output Voltage | Fixed 5V ±1.2% - eliminates external feedback resistors; SENSE pin directly monitors regulated output |
| Max Output Current | 1.25A continuous - limited by 1.5A switch rating and thermal design with fused SO-8 ground lead |
| Switching Frequency | 200kHz nominal, synchronizable 250–400kHz - enables EMI-controlled layout and avoids sensitive frequency bands |
| Switch On Resistance | 0.2Ω typical - reduces conduction loss and improves full-load efficiency over bipolar predecessors |
| Shutdown Current | 20µA max - enables ultra-low-power standby in battery-backed systems |
| Reference Voltage | 1.21V ±1.7% - sets precision output tolerance and enables accurate current-limit threshold derivation |
Pinout & Package
Fused-lead 8-pin plastic SOIC (SO-8) package with exposed ground lead thermally enhanced for θJA = 80°C/W when connected to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW (Pin 1) | Switch emitter node | Connects to inductor; clamped negative swing ≤ –0.8V during off-time; requires low-inductance catch diode path |
| VIN (Pin 2) | Power switch collector & bias source | Supplies internal circuitry; high dI/dt node requiring local 100µF solid tantalum bypass |
| BOOST (Pin 3) | Bootstrap drive voltage input | Accepts external capacitor-diode network to raise gate drive above VIN for NPN saturation |
| GND (Pin 4) | Signal and power reference | Fused ground lead minimizes thermal resistance; must tie directly to load return and ground plane |
| BIAS (Pin 5) | Efficiency-optimizing auxiliary supply | Connect to 5V output to reduce total input current by ~10% at VIN=20V, IOUT=25mA |
| VC (Pin 6) | Error amplifier output / current limit comparator input | Used for loop compensation; clamps at 2.1V; driven to GND to force shutdown |
| SENSE (Pin 7) | Fixed-output voltage sense input | Replaces FB pin on -5 variants; monitors 5V output directly; triggers foldback below 0.7V |
| SYNC (Pin 8) | External clock synchronization input | Replaces SHDN on -SYNC variants; accepts 10–90% duty cycle logic signals up to 400kHz |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode control architecture | Enables fast transient response and inherent stability without external compensation components beyond VC network |
| Synchronization capability | Eliminates beat frequencies in multi-rail systems by aligning switching edges to master clock |
| Fused SO-8 thermal design | Reduces junction-to-ambient thermal resistance by ~30% vs standard SO-8, extending ambient range to 125°C |
| Integrated slope compensation | Prevents subharmonic oscillation at >50% duty cycle while maintaining 1.5A peak switch current capability |
| Output short-circuit protection | Combines frequency foldback (to ~40kHz) and current limit reduction (to <0.77A) to limit IC and external component power dissipation |
Applications
| Portable Computers | Battery-Powered Systems |
|---|---|
Use Scenario: Powering 5V peripherals (USB hubs, display interfaces) from 12V or 19V laptop main battery rails. IC Role / Device Role / Timing Role: Primary 5V buck converter delivering regulated power with tight ripple control and low quiescent current during sleep states. Use Value: Enables >88% efficiency at 1A load and 20µA shutdown current extends battery runtime between charges. | Use Scenario: Supplying 5V logic and analog circuitry in handheld test equipment powered by rechargeable Li-ion packs. IC Role / Device Role / Timing Role: Main system regulator with SYNC input aligned to MCU clock domain to suppress conducted EMI in sensitive measurement circuits. Use Value: Synchronization eliminates heterodyne noise in ADC sampling paths and allows predictable spectral placement of switching harmonics. |
| Battery Charger Control | Distributed Power Architectures |
Use Scenario: Generating isolated 5V bias for charger controller ICs and gate drivers in multi-cell Li-ion charging modules. IC Role / Device Role / Timing Role: Auxiliary supply providing stable 5V rail independent of main charging voltage, with BIAS pin connected to output to minimize input current draw. Use Value: BIAS connection improves efficiency by 10% at high input voltages (e.g., 20V), reducing thermal stress on upstream DC/DC stages. | Use Scenario: Local point-of-load regulation for FPGA I/O banks or communication PHYs in telecom line cards with centralized 12V or 48V backplanes. IC Role / Device Role / Timing Role: Compact, surface-mount buck regulator synchronized to system timing reference to prevent interference with high-speed serial links (e.g., PCIe, SGMII). Use Value: 15µH inductor size and SO-8 footprint enable dense board layouts while SYNC ensures deterministic noise coupling into adjacent signal traces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3605EDE#TRPBF | 4MHz constant-on-time architecture; 3A output; no BOOST pin; requires external MOSFETs | Higher frequency enables smaller LC filter but lacks integrated bipolar switch and BOOST-driven saturation | Select LTC3605EDE#TRPBF only when higher switching frequency and higher current are required, and external FET layout is acceptable |
| LM2678SX-5.0/NOPB | 63kHz fixed-frequency; 5A output; no SYNC; larger TO-263 package; no BIAS pin | Higher current capability but lower efficiency at light loads due to higher quiescent current (50mA vs 1.16mA) | Select LM2678SX-5.0/NOPB when maximum output current >1.25A is needed and synchronization is not required |
Compared with LTC3605EDE#TRPBF and LM2678SX-5.0/NOPB, the LT1576CS8-SYNC#TRPBF uniquely combines 200kHz synchronization, integrated BOOST-driven NPN switch, fused SO-8 thermal performance, and 20µA shutdown-making it optimal for space-constrained, noise-sensitive 5V/1.25A applications where external FETs or large packages are undesirable.
Availability
LT1576CS8-SYNC#TRPBF 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 traceable sourcing.
Supply support for LT1576CS8-SYNC#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 and maintains its legacy high-performance power management portfolio with rigorous qualification and long-term product support.
The LT1576 family was designed specifically for noise-sensitive portable and battery-operated applications requiring high efficiency, low EMI, and robust short-circuit protection without external complexity.
FAQ
What is the function of the SYNC pin on the LT1576CS8-SYNC#TRPBF?
The SYNC pin on the LT1576CS8-SYNC#TRPBF replaces the SHDN pin found on non-SYNC variants and accepts logic-level external clock signals (10–90% duty cycle) from 250kHz to 400kHz to synchronize the internal 200kHz oscillator. This prevents beat frequencies in multi-rail systems and enables deterministic EMI placement. The LT1576CS8-SYNC#TRPBF does not support shutdown via this pin; it remains fully operational when SYNC is unconnected or held static.
Can the LT1576CS8-SYNC#TRPBF be used with a 3.3V output?
No, the LT1576CS8-SYNC#TRPBF is a fixed 5V output variant with internal resistor divider and SENSE pin functionality. To achieve 3.3V output, use the adjustable LT1576CS8 or LT1576CS8-SYNC variants with external FB resistors. The LT1576CS8-SYNC#TRPBF's SENSE pin is hardwired to monitor 5V and will trigger foldback protection if voltage drops below 0.7V, making it unsuitable for lower output configurations.
What is the minimum inductor value recommended for the LT1576CS8-SYNC#TRPBF at 5V/1.25A?
The minimum recommended inductor value for the LT1576CS8-SYNC#TRPBF at 5V/1.25A is 15µH, as validated in the datasheet's Typical Application and Maximum Load Current graphs. Using <15µH risks exceeding the 1.5A peak switch current limit under continuous conduction mode, especially at higher input voltages like 25V. For loads above 0.6A, increase to 30µH; above 1A, use 60µH per datasheet guidance.
How does the BOOST pin improve efficiency in the LT1576CS8-SYNC#TRPBF?
The BOOST pin on the LT1576CS8-SYNC#TRPBF supplies elevated drive voltage to the base of the internal NPN power switch via an external capacitor-diode network, enabling deep saturation and reducing effective on-resistance to 0.2Ω. This lowers conduction loss versus conventional bipolar designs, raising efficiency from ~75% to >88% at 5V/1A. The BOOST pin draws current only during switch on-time, minimizing quiescent overhead.
Is the LT1576CS8-SYNC#TRPBF RoHS compliant and halogen-free?
Yes, the LT1576CS8-SYNC#TRPBF is RoHS compliant and halogen-free per Analog Devices' official product change notices and packaging specifications. The "#TRPBF" suffix denotes tape-and-reel packaging with lead-free (Pb-free) terminations and green molding compound meeting JEDEC J-STD-609A Class 1 requirements. Full compliance documentation is available in the manufacturer's PCN archives.
LT1576CS8-SYNC#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5V
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 1.21V
- Voltage - Output (Max):
- 23.5V
- 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-SYNC#TRPBF FAQ
1.How can I place an order for LT1576CS8-SYNC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1576CS8-SYNC#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-SYNC#TRPBF reliable?
The price and inventory of LT1576CS8-SYNC#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-SYNC#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1576CS8-SYNC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1576CS8-SYNC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1576CS8-SYNC#TRPBF?
LT1576CS8-SYNC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1576CS8-SYNC#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-SYNC#TRPBF?
For technical support, including LT1576CS8-SYNC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1576CS8-SYNC#TRPBF requirements.
6.How does Aetrix verify that LT1576CS8-SYNC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1576CS8-SYNC#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-SYNC#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1576CS8-SYNC#TRPBF?
All LT1576CS8-SYNC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1576CS8-SYNC#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-SYNC#TRPBF part is unused and in its original packaging.
Return procedure for LT1576CS8-SYNC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1576CS8-SYNC#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
