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Analog Devices Inc. LT8625SPJV#TRPBF
- Part No.:
- LT8625SPJV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8625SPJV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 8A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,073
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Product details
Overview
LT8625SPJV#TRPBF from Analog Devices is a 18V/8A synchronous step-down Silent Switcher 3 regulator with ultralow noise reference, featuring 4μVRMS output noise (10Hz–100kHz), 4nV/√Hz spot noise at 10kHz, and 15ns minimum on-time. It operates from 2.7V to 18V input, delivers up to 8A continuous output, and supports dynamic voltage control in noise-sensitive RF power supplies and high-precision data converters.
For engineers reviewing the LT8625SPJV#TRPBF datasheet, LT8625SPJV#TRPBF pinout, LT8625SPJV#TRPBF application, or LT8625SPJV#TRPBF equivalent, this page provides verified package mapping (20-lead 4mm × 3mm LQFN), thermal performance data (θJC(pad) = 12.1°C/W), EMI-tested operation up to 4MHz, and validated alternatives for low-noise DC/DC design.
Technical Context
The LT8625SPJV#TRPBF implements third-generation Silent Switcher architecture with integrated ultralow-noise reference and internal bypass capacitors to suppress radiated EMI without external filters. Its dual-input rail design separates PVIN (power path) and SVIN (signal/reference path), enabling precise regulation even under wide input-voltage transients.
It features a PNP/NPN-switching error amplifier that automatically transitions based on SVIN–VSET differential, maintaining ±0.8% output accuracy over temperature with remote sense (OUTS). PolyPhase® capability supports up to 12-phase interleaving for current sharing and ripple cancellation in high-current systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 18V - supports wide industrial and automotive supply rails without pre-regulation |
| Max Output Current | 8A continuous - enables single-chip power delivery for FPGA core rails or multi-core SoCs |
| Output Noise (RMS) | 4μVRMS (10Hz–100kHz) - meets stringent requirements for PLL/VCO and high-speed ADC/DAC analog supplies |
| Switching Frequency | 300kHz to 4MHz - allows optimization of size vs. efficiency; 2MHz typical for compact 1V/8A designs |
| Min On-Time | 15ns - enables high step-down ratios (e.g., 12V→1V at 2MHz) without pulse-skipping instability |
| Reference Accuracy | ±0.8% over –40°C to 150°C with remote sense - ensures stable output under thermal stress and load variation |
| Thermal Resistance θJC | 12.1°C/W (pad) - enables >6W dissipation with standard PCB copper; exposed back pad must be soldered to GND |
Pinout & Package
LT8625SPJV#TRPBF uses a 20-lead 4mm × 3mm × 0.95mm LQFN package with exposed back pad (Pin 21) tied to GND. The top-side exposed die enables optional heatsink attachment for improved thermal performance in high-power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1, 20) | Power switch node | Connects directly to inductor; requires minimal PCB area to reduce EMI and switching losses |
| PVIN (Pins 5–6) | Main power input | Supplies top MOSFET and internal drivers; must be bypassed with ≥4.7µF ceramic capacitor near pins |
| SVIN (Pin 7) | Signal/reference input | Provides headroom for ultralow-noise reference; must exceed VSET by ≥400mV (e.g., 3.7V for 3.3V output) |
| SET (Pin 11) | Voltage setpoint input | Sources precision 100µA current; output voltage = 100µA × RSET; Kelvin connection improves load regulation |
| OUTS (Pin 13) | Remote output sense | Connects directly to load for accurate regulation; eliminates IR drop errors in high-current paths |
| PGFB (Pin 14) | Programmable power-good feedback | Sets PG threshold via resistor divider; also triggers fast start-up when pulled above 400mV |
| VC (Pin 12) | Error amplifier output | Controls peak switch current; RC compensation network required for loop stability |
| GND (Pins 3, 4, 21) | Ground reference | Exposed pad (Pin 21) is GND and must be soldered to PCB ground plane for thermal and EMI performance |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow RMS noise | 4μVRMS (10Hz–100kHz) - enables direct powering of RF synthesizers without additional LDO post-regulation |
| Silent Switcher 3 architecture | Integrated bypass caps + symmetric layout - achieves CISPR Class B radiated EMI compliance without ferrite beads or shields |
| Fast transient response | 1μs recovery time - maintains <±1% output deviation during 2A→5A load steps at 1V output |
| Adjustable switching frequency | 300kHz–4MHz via RT resistor - allows trade-off between inductor size (higher fSW) and light-load efficiency (lower fSW) |
| PolyPhase® support | Up to 12-phase interleaving - reduces input/output ripple by √N and enables >96A total current with phase synchronization |
| Forced Continuous Mode (FCM) | Enabled by floating SYNC/MODE - eliminates audible noise and ensures consistent loop bandwidth across full load range |
Applications
| RF Power Supplies | High-Speed Data Converters |
|---|---|
|
Use Scenario: Powering VCOs, PLLs, and LNAs in 5G mmWave transceivers where phase noise directly impacts EVM. IC Role / Device Role / Timing Role: Primary low-noise buck regulator supplying analog core voltage (1.0–1.2V) with ultra-stable reference. Use Value: 4nV/√Hz spot noise at 10kHz prevents degradation of oscillator close-in phase noise; Silent Switcher architecture avoids RF band interference. |
Use Scenario: Supplying AVDD rails for 16-bit+ SAR ADCs and high-fidelity DACs in medical imaging and test equipment. IC Role / Device Role / Timing Role: Precision DC/DC converter delivering clean 1.8V/3.3V with remote sensing to compensate for PCB trace resistance. Use Value: ±0.8% reference accuracy and 4μVRMS noise ensure <0.5 LSB integral nonlinearity error across temperature and load. |
| Low-Noise Instrumentation | Industrial Control Systems |
|
Use Scenario: Biasing low-noise op-amps and precision current sources in portable analytical instruments (e.g., gas chromatography detectors). IC Role / Device Role / Timing Role: Dual-rail regulator providing independent, low-ripple ±5V or +15V/–5V outputs via cascaded configurations. Use Value: Ultralow 0.1Hz–100kHz noise floor preserves signal integrity in sub-μV measurement front-ends; 150°C junction rating supports sealed enclosures. |
Use Scenario: Powering real-time microcontrollers and isolated I/O modules in PLCs operating in harsh factory environments. IC Role / Device Role / Timing Role: High-current, thermally robust DC/DC stage converting 24V bus to 5V/3.3V system rails with fault reporting. Use Value: Integrated power-good flag (PG) and thermal shutdown enable predictive maintenance; 12.1°C/W θJC(pad) sustains 8A output at 85°C ambient with 2oz copper. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-efficiency, low-noise buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8627SPJV#TRPBF | 16A rated, 24-lead 4mm × 4mm LQFN, pin-to-pin compatible with LT8625SP-1 variant but not LT8625SP | Higher current capacity for multi-rail systems; requires larger PCB footprint and different thermal management | Select when >8A continuous output is needed and board space allows 4mm × 4mm package |
| LT8650SIV#TRPBF | Dual-channel 4A/4A output, same Silent Switcher 3 architecture, 4μVRMS noise, but no PolyPhase® support | Reduces component count in dual-rail applications (e.g., AVDD/DVDD); lacks phase synchronization for >8A scaling | Select for space-constrained dual-output designs where interleaving is unnecessary |
Compared with LT8625SPJV#TRPBF, LT8627SPJV#TRPBF offers higher current but requires layout revision, while LT8650SIV#TRPBF provides dual outputs in smaller area but cannot scale beyond 8A total. LT8625SPJV#TRPBF remains optimal for single-rail 8A applications demanding lowest noise and smallest footprint.
Availability
LT8625SPJV#TRPBF is available at Aetrix Electronics and suitable for RF power supplies, high-speed data converters, low-noise instrumentation, and industrial control systems requiring stable component supply and long-term lifecycle support.
Supply support for LT8625SPJV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power and signal chain solutions.
The LT8625SPJV#TRPBF belongs to Analog Devices' Silent Switcher® 3 product line, engineered specifically for ultra-low-noise, high-efficiency DC/DC conversion in RF, instrumentation, and high-speed data acquisition systems.
FAQ
What is the maximum continuous output current of the LT8625SPJV#TRPBF?
The LT8625SPJV#TRPBF delivers up to 8A continuous output current under thermal limits defined by its 4mm × 3mm LQFN package and PCB copper area. At 25°C ambient with 2oz copper and proper GND pad soldering, it sustains 8A at 1V output with 2MHz switching and <15°C case rise. Derating applies above 85°C ambient per θJA = 45°C/W.
How does the LT8625SPJV#TRPBF achieve ultralow output noise?
The LT8625SPJV#TRPBF achieves 4μVRMS (10Hz–100kHz) noise through third-generation Silent Switcher architecture, an integrated ultralow-noise reference, and internal bypass capacitors that suppress switching artifacts. Its dual-input design (PVIN/SVIN) isolates power-stage noise from the reference path, and the SET pin's 100µA current source minimizes thermal noise contribution from external resistors.
Can the LT8625SPJV#TRPBF be synchronized to an external clock?
Yes, the LT8625SPJV#TRPBF supports external synchronization via its SYNC/MODE pin (Pin 17). When driven with a TTL/CMOS clock signal, it locks its internal oscillator to the external frequency within the 300kHz–4MHz range. This enables EMI reduction through frequency dithering or deterministic timing alignment in multi-regulator systems.
What is the purpose of the SVIN pin on the LT8625SPJV#TRPBF?
The SVIN pin on the LT8625SPJV#TRPBF supplies current to the ultralow-noise reference and error amplifier circuits. It must be ≥400mV above the SET pin voltage (e.g., 3.7V for a 3.3V output) to maintain reference stability and regulation accuracy. SVIN can be derived from a separate low-noise supply or a filtered PVIN rail, and requires a local 1µF bypass capacitor.
Does the LT8625SPJV#TRPBF support remote output voltage sensing?
Yes, the LT8625SPJV#TRPBF supports true remote sensing via its OUTS pin (Pin 13), which connects directly to the load point. This compensates for voltage drop across PCB traces and connectors, ensuring ±0.8% output accuracy at the load under full 8A current. For best results, Kelvin-connect OUTS to the output capacitor's load-side terminal and tie the SET resistor's ground to the same node.
LT8625SPJV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®3
- Package/Case:
- 20-TFQFN Exposed Pad
- 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):
- 2.7V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 17.5V
- Current - Output:
- 8A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (3x4)
LT8625SPJV#TRPBF FAQ
1.How can I place an order for LT8625SPJV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8625SPJV#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 LT8625SPJV#TRPBF reliable?
The price and inventory of LT8625SPJV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8625SPJV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8625SPJV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8625SPJV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8625SPJV#TRPBF?
LT8625SPJV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8625SPJV#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 LT8625SPJV#TRPBF?
For technical support, including LT8625SPJV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8625SPJV#TRPBF requirements.
6.How does Aetrix verify that LT8625SPJV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8625SPJV#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 LT8625SPJV#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8625SPJV#TRPBF?
All LT8625SPJV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8625SPJV#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 LT8625SPJV#TRPBF part is unused and in its original packaging.
Return procedure for LT8625SPJV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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