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Analog Devices Inc. LT8625SPJV-1#TRMPBF
- Part No.:
- LT8625SPJV-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8625SPJV-1#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 8A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:396
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Product details
Overview
LT8625SPJV-1#TRMPBF from Analog Devices is a 18V/8A synchronous step-down DC/DC regulator featuring third-generation Silent Switcher 3 architecture, ultralow RMS output noise (3.5μVRMS, 10Hz–100kHz), 4nV/√Hz spot noise at 10kHz, and programmable switching frequency from 300kHz to 4MHz. It delivers high efficiency (>95% at 8A, 12VIN→1VOUT) in noise-sensitive RF power supply applications for PLLs, VCOs, and LNAs.
For engineers reviewing the LT8625SPJV-1#TRMPBF datasheet, LT8625SPJV-1#TRMPBF pinout, LT8625SPJV-1#TRMPBF application, or LT8625SPJV-1#TRMPBF equivalent, this page provides verified package mapping (24-lead 4mm × 4mm LQFN with exposed GND pad), thermal performance data (θJA = 41°C/W JEDEC board), PolyPhase® capability up to 12 phases, and confirmed alternative options for low-noise high-current buck conversion.
Technical Context
The LT8625SPJV-1#TRMPBF integrates an ultralow-noise reference with Silent Switcher 3 architecture to achieve simultaneous high efficiency and exceptional wideband noise suppression. Its dual-input design separates PVIN (power path) and SVIN (signal/reference path), enabling independent optimization of power delivery and regulation stability.
It supports forced continuous mode (FCM), pulse-skipping, and external synchronization via SYNC/MODE pin; features fast 1μs transient response; and enables dynamic output voltage control through SET pin current programming (100µA ±0.8% over temperature). The error amplifier uses PNP/NPN input pair auto-selection based on SVIN–VSET differential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 18V - Supports wide industrial and automotive input rails without pre-regulation. |
| Max Continuous Output Current | 8A - Delivers high current in compact 4mm × 4mm footprint with top-side exposed pad for heatsink attachment. |
| Output Noise (10Hz–100kHz) | 3.5μVRMS - Enables direct powering of RF analog blocks (e.g., VCOs, LNAs) without additional LDO post-regulation. |
| Switching Frequency Range | 300kHz to 4MHz - Adjustable via RT resistor; 4MHz operation allows ultra-small external inductors (e.g., 0.15µH). |
| Reference Accuracy | ±0.8% over –40°C to +150°C - Ensures stable output under extreme thermal conditions with remote sense (OUTS). |
| Min On-Time | 15ns - Enables high step-down ratios (e.g., 12V→1V at 2MHz) while maintaining regulation at light loads. |
| Thermal Rating | Junction temperature rated to 150°C - Validated for operation in sealed enclosures or high-ambient environments. |
Pinout & Package
LT8625SPJV-1#TRMPBF is housed in a 24-lead 4mm × 4mm × 0.95mm LQFN package with exposed GND pads (Pins 25–28) on the bottom surface. The top-side exposed die area enables optional heatsink mounting for enhanced thermal performance (θJC(top) = 4.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 5–8) | Main power input | Supplies current to internal top MOSFET and bias circuits; requires ≥4.7µF local ceramic bypass. |
| SVIN (Pin 9) | Signal/reference input | Provides headroom for ultralow-noise reference; must exceed VSET by ≥400mV (e.g., 3.7V for 3.3V output). |
| SW (Pins 1–2, 22–24) | Power switch node | Connects to inductor; PCB layout must minimize loop area to preserve EMI performance. |
| SET (Pin 13) | Voltage setpoint input | Sources precision 100µA current; output voltage = 100µA × RSET; bypass capacitor reduces noise but increases start-up time. |
| OUTS (Pin 15) | Remote output sense | Kelvin-connected to load for accurate regulation under high-current PCB trace IR drop. |
| PGFB (Pin 16) | Programmable power-good feedback | Sets PG threshold via resistor divider; also triggers fast start-up when pulled above 0.5V. |
| SYNC/MODE (Pin 19) | Operating mode control | Selects pulse-skipping (GND), forced continuous (INTVCC), or external sync (clock input). |
| GND (Pins 3, 4, 25–28) | Ground reference | Exposed pad must be soldered to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow RMS noise (3.5μVRMS) | Enables direct powering of RF signal chains without post-LDO filtering, reducing BOM count and board area. |
| Silent Switcher 3 architecture | Minimizes radiated EMI emissions to meet CISPR 32 Class B limits without shielding or complex layout constraints. |
| PolyPhase® support (up to 12 phases) | Allows parallel operation of multiple LT8625SPJV-1#TRMPBF units to scale current capacity while reducing input/output ripple. |
| Fast 1μs transient response | Maintains tight output regulation during rapid load steps (e.g., digital core burst activity), minimizing required output capacitance. |
| Adjustable 300kHz–4MHz fSW | Permits optimization between efficiency (lower fSW) and size (higher fSW) across diverse system requirements. |
| 15ns minimum on-time | Supports high-frequency, high-step-down operation (e.g., 12V→1V @ 4MHz) without pulse skipping at light loads. |
Applications
| RF Power Supply | High-Speed Data Converter |
|---|---|
|
Use Scenario: Powering VCOs, PLLs, and LNAs in 5G mmWave transceivers where phase noise directly impacts EVM and spectral purity. IC Role / Device Role / Timing Role: Primary low-noise buck converter delivering stable 1.0V or 1.2V rail with <3.5μVRMS integrated noise. Use Value: Eliminates need for secondary LDO stage, reducing power loss and board space while meeting −165dBc/Hz phase noise targets. |
Use Scenario: Supplying AVDD and DVDD rails for 16-bit+ SAR ADCs and high-speed DACs in test equipment and medical imaging systems. IC Role / Device Role / Timing Role: High-current, low-noise analog supply with remote sensing to compensate for PCB trace resistance. Use Value: Maintains ENOB >15.5 bits by suppressing supply-induced harmonic distortion and jitter in sampling clocks. |
| Low-Noise Instrumentation | Industrial Control System |
|
Use Scenario: Biasing precision op-amps, instrumentation amplifiers, and reference buffers in portable multimeters and calibration sources. IC Role / Device Role / Timing Role: Low-drift, low-noise DC/DC source with ±0.8% reference accuracy over full temperature range. Use Value: Achieves <1ppm/°C effective drift in closed-loop systems, enabling sub-10ppm total measurement uncertainty. |
Use Scenario: Powering FPGA I/O banks and real-time processor cores in ruggedized PLC modules operating at 85°C ambient. IC Role / Device Role / Timing Role: High-reliability buck regulator with 150°C junction rating and robust thermal management via exposed pad. Use Value: Sustains 8A output continuously without derating, eliminating thermal throttling in fanless enclosures. |
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 |
|---|---|---|---|
| LT8627SP#TRMPBF | 16A max output current; identical 24-lead 4mm × 4mm LQFN package and pinout; same Silent Switcher 3 architecture and noise specs. | Higher current capability suits multi-rail systems requiring >8A per rail; larger inductor and input capacitor needed. | Select LT8627SP#TRMPBF when peak load exceeds 8A or future-proofing for higher current is required; fully pin-compatible upgrade. |
| LT8650S#TRMPBF | Dual-channel 4A + 4A output; shared Silent Switcher 3 architecture; 4.5μVRMS noise (10Hz–100kHz); 20-lead 4mm × 3mm LQFN. | Optimized for space-constrained dual-rail applications (e.g., split AVDD/DVDD); lower per-channel current than LT8625SPJV-1#TRMPBF. | Choose LT8650S#TRMPBF for dual-output systems needing matched low-noise rails in minimal area; not pin-compatible. |
Compared with LT8627SP#TRMPBF, the LT8625SPJV-1#TRMPBF offers identical noise performance and package compatibility at lower cost and thermal footprint for 8A applications; versus LT8650S#TRMPBF, it provides higher single-rail current and superior thermal dissipation in a larger but still compact 4mm × 4mm body.
Availability
LT8625SPJV-1#TRMPBF is available at Aetrix Electronics and suitable for RF power supplies, high-speed data converter systems, and low-noise instrumentation requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LT8625SPJV-1#TRMPBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.
The LT8625SP/LT8625SP-1 product line was designed specifically for ultra-low-noise, high-current DC/DC conversion in RF and precision analog systems-prioritizing spectral purity, thermal resilience, and layout simplicity over generic power delivery.
FAQ
What is the maximum output current rating for the LT8625SPJV-1#TRMPBF?
The LT8625SPJV-1#TRMPBF is rated for 8A maximum continuous output current under specified thermal conditions (JEDEC board, θJA = 41°C/W). Derating is required above 85°C ambient or with reduced airflow; actual achievable current depends on PCB copper area, heatsink use, and input/output voltage differential. The device's 150°C junction rating enables sustained 8A operation in well-designed layouts.
How does the LT8625SPJV-1#TRMPBF achieve ultralow output noise compared to standard buck converters?
The LT8625SPJV-1#TRMPBF achieves 3.5μVRMS (10Hz–100kHz) output noise through three integrated techniques: (1) an ultralow-noise voltage reference with 4nV/√Hz spectral density at 10kHz, (2) Silent Switcher 3 architecture that minimizes magnetic field coupling via symmetrical power loop layout and integrated bypass capacitors, and (3) separate PVIN/SVIN inputs isolating noisy power paths from sensitive reference circuitry. These features eliminate the need for post-regulation LDOs in RF applications.
Is the LT8625SPJV-1#TRMPBF pin-compatible with other devices in the LT8625SP family?
Yes-the LT8625SPJV-1#TRMPBF shares identical pinout and package (24-lead 4mm × 4mm LQFN) with the LT8627SP#TRMPBF, making it a direct pin-to-pin replacement for 16A designs where 8A suffices. However, it is not pin-compatible with the 20-lead LT8625SP (4mm × 3mm) variant. All LT8625SP-1 variants use the same pin numbering and function mapping per the datasheet's 24-lead configuration.
What thermal performance can be expected from the LT8625SPJV-1#TRMPBF in a typical 4-layer PCB layout?
In a standard 4-layer JEDEC board (2oz copper, 1in² thermal pad), the LT8625SPJV-1#TRMPBF achieves θJA = 41°C/W. With 2in² of 2oz inner-layer copper connected to the exposed GND pad (Pins 25–28), θJA improves to ~29°C/W (matching demo board DC3147A). Adding a top-side heatsink to the exposed die further reduces θJC(top) to 4.1°C/W, enabling >8A operation at 85°C ambient without derating.
Can the LT8625SPJV-1#TRMPBF be synchronized to an external clock, and what is the valid input range?
Yes-the LT8625SPJV-1#TRMPBF supports external synchronization via the SYNC/MODE pin (Pin 19). A clean CMOS or LVDS clock signal from 300kHz to 4MHz can be applied directly. The SYNC threshold is 0.7V (low) and 1.5V (high), with hysteresis ensuring noise immunity. When synchronized, the device maintains tight phase alignment across PolyPhase® configurations and eliminates beat frequencies in multi-rail systems.
LT8625SPJV-1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®3
- Package/Case:
- 24-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:
- 24-LQFN (4x4)
LT8625SPJV-1#TRMPBF FAQ
1.How can I place an order for LT8625SPJV-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8625SPJV-1#TRMPBF 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-1#TRMPBF reliable?
The price and inventory of LT8625SPJV-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8625SPJV-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8625SPJV-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8625SPJV-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8625SPJV-1#TRMPBF?
LT8625SPJV-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8625SPJV-1#TRMPBF 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-1#TRMPBF?
For technical support, including LT8625SPJV-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8625SPJV-1#TRMPBF requirements.
6.How does Aetrix verify that LT8625SPJV-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8625SPJV-1#TRMPBF 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-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8625SPJV-1#TRMPBF?
All LT8625SPJV-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8625SPJV-1#TRMPBF, 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-1#TRMPBF part is unused and in its original packaging.
Return procedure for LT8625SPJV-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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