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Analog Devices Inc. LT8625SPJV#TRMPBF
- Part No.:
- LT8625SPJV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8625SPJV#TRMPBF.pdf
- Description:
- IC REG BUCK 8A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:473
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Product details
Overview
LT8625SPJV#TRMPBF from Analog Devices is a 18V/8A synchronous step-down Silent Switcher 3 regulator with ultralow noise reference, 4μVRMS output noise (10Hz–100kHz), 15ns minimum on-time, and 300kHz–4MHz adjustable switching frequency. It delivers high efficiency at high frequencies and targets noise-sensitive RF power supplies for PLLs, VCOs, and LNAs.
For engineers reviewing the LT8625SPJV#TRMPBF datasheet, LT8625SPJV#TRMPBF pinout, LT8625SPJV#TRMPBF application, or LT8625SPJV#TRMPBF equivalent, key selection factors include its integrated ultralow-noise reference, PolyPhase® capability up to 12 phases, forced continuous mode support, remote sensing via OUTS, and programmable power good with ±0.8% output voltage accuracy over temperature.
Technical Context
The LT8625SPJV#TRMPBF implements third-generation Silent Switcher architecture with internal bypass capacitors and an ultralow-noise 100µA SET-pin current reference, enabling <4μVRMS integrated output noise independent of output voltage. Its current-mode control loop uses VC as error amplifier output, supporting RC compensation and fast transient response (1µs).
It features dual-error-amplifier topology (PNP/NPN input pairs) that auto-switches based on SVIN–VSET differential, supports dynamic output voltage control via SET pin, and integrates programmable soft-start, fast start-up circuitry triggered by PGFB, and phase-shifted CLKOUT for multi-phase synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 18V - supports wide industrial and automotive supply rails without external pre-regulation. |
| Max Continuous Output Current | 8A - enables single-chip high-current rail for FPGA core, ASIC, or RF power stages. |
| Output Noise (10Hz–100kHz) | 3.5μVRMS - meets stringent low-noise requirements for RF signal chains and precision ADC/DAC references. |
| Switching Frequency Range | 300kHz to 4MHz - allows optimization for size (high-freq) or efficiency (low-freq) and EMI compliance. |
| Reference Accuracy | ±0.8% over temperature with remote sense - ensures stable output under thermal drift and PCB IR drop. |
| Min On-Time | 15ns - enables high step-down ratios (e.g., 12V→1V at 2MHz) without pulse-skipping instability. |
| Package | 20-lead 4mm × 3mm LQFN with exposed GND pad - provides low θJC(pad) = 12.8°C/W for high-power thermal management. |
Pinout & Package
LT8625SPJV#TRMPBF is housed in a 20-lead 4mm × 3mm × 0.94mm LQFN package with exposed thermal pad (Pin 21) soldered to PCB ground. The package complies with JEDEC MS-012 and supports reflow per IPC/JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1, 20) | Power switch node | Connects directly to inductor; must be minimized in area to reduce radiated EMI per Silent Switcher layout rules. |
| GND (Pins 3, 4, 21) | Ground reference & thermal path | Exposed pad (Pin 21) is mandatory GND connection for thermal performance and EMI reduction. |
| PVIN (Pins 5–6) | Main power input | Supplies top MOSFET and internal bias; requires ≥4.7µF local ceramic capacitor with short, low-inductance path to GND. |
| SVIN (Pin 7) | Signal input supply | Must exceed VSET by ≥400mV; powers ultralow-noise reference and error amp-critical for noise performance. |
| SET (Pin 11) | Voltage setpoint input | Sources precise 100µA current; output voltage = 100µA × RSET - enables resistor-programmed, noise-invariant regulation. |
| VC (Pin 12) | Error amplifier output | Controls peak switch current; RC network here sets loop stability and transient response bandwidth. |
| OUTS (Pin 13) | Remote output sense | Kelvin-connected to load for accurate regulation under PCB trace resistance and dynamic load shifts. |
| PGFB (Pin 14) | Programmable power-good threshold | Configures ±7.5% window around 0.5V; also activates fast start-up when pulled above 400mV during startup. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow RMS noise (10Hz–100kHz) | 3.5μVRMS - eliminates need for post-regulation LDOs in RF power supplies for VCOs and LNAs. |
| Silent Switcher 3 architecture | Integrated bypass capacitors + symmetric layout - achieves CISPR Class B radiated EMI compliance without external filters. |
| PolyPhase® operation support | CLKOUT and PHMODE pins enable up to 12-phase interleaving - reduces input/output ripple and thermal stress across multiple ICs. |
| Fast transient response | 1µs recovery time - maintains tight regulation during sudden load steps in high-speed digital cores. |
| Adjustable & synchronizable frequency | 300kHz–4MHz via RT resistor or external SYNC clock - enables EMI spread-spectrum tuning and system-level clock alignment. |
| Forced Continuous Mode (FCM) | Enabled via SYNC/MODE pin - ensures constant switching frequency across full load range for predictable EMI and loop stability. |
Applications
| RF Power Supply | High-Speed Data Converter Bias |
|---|---|
|
Use Scenario: Powering VCOs, PLLs, and low-noise amplifiers in 5G transceivers and radar front-ends. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering ultra-low-noise 1V–3.3V rails with sub-5μVRMS noise floor. Use Value: Enables >60dB SFDR in RF signal chains by eliminating switching noise coupling into sensitive analog blocks. |
Use Scenario: Supplying analog and reference rails for 16-bit+ SAR ADCs and high-fidelity DACs in test equipment. IC Role / Device Role / Timing Role: High-accuracy, low-noise buck regulator with remote sense and ±0.8% reference tolerance. Use Value: Preserves ENOB by minimizing power-supply-induced harmonic distortion and quantization noise. |
| Low-Noise Instrumentation | FPGA/ASIC Core Power |
|
Use Scenario: Biasing precision op-amps, instrumentation amplifiers, and sensor signal-conditioning circuits. IC Role / Device Role / Timing Role: Low-drift, low-ripple DC source with Kelvin sensing and fast load-step response. Use Value: Maintains µV-level offset stability and prevents measurement drift under dynamic sensor excitation loads. |
Use Scenario: Delivering 0.8V–1.2V core voltage to Xilinx Versal or Intel Agilex FPGAs with 6–8A peak current. IC Role / Device Role / Timing Role: High-current monolithic buck with 15ns min-on-time and PolyPhase® scalability. Use Value: Supports high-frequency operation (≥2MHz) while meeting tight voltage tolerance (±3%) and fast droop recovery. |
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 4mm × 3mm LQFN package, pin-to-pin compatible per datasheet note. | Targets higher-current FPGA/GPU rails where 8A headroom is insufficient; same noise specs and feature set. | Select LT8627SP#TRMPBF when >8A continuous load or future-proofing for higher-power derivatives is required. |
| LT8650S#TRMPBF | Dual-output (2×4A), shared Silent Switcher 3 architecture, 4μVRMS noise, but larger 24-lead 4mm × 5mm package. | Used where two independent low-noise rails (e.g., AVDD + DVDD) are needed on one IC; adds channel synchronization. | Choose LT8650S#TRMPBF for space-constrained dual-rail systems requiring matched noise and timing behavior. |
Compared with LT8625SPJV#TRMPBF, LT8627SP#TRMPBF offers double current capacity in identical footprint, while LT8650S#TRMPBF trades single-rail simplicity for dual-rail integration and slightly larger board area-both retain ultralow noise and PolyPhase® support.
Availability
LT8625SPJV#TRMPBF is available at Aetrix Electronics and suitable for RF power supplies, high-speed data converter biasing, and low-noise instrumentation requiring stable component supply, full production traceability, and long-term lifecycle assurance.
Supply support for LT8625SPJV#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 precision, industrial, communications, and automotive markets.
The LT8625SPJV#TRMPBF belongs to the Silent Switcher 3 product line, engineered specifically for ultra-low-noise, high-efficiency DC/DC conversion in RF, test & measurement, and high-fidelity signal chain applications.
FAQ
What is the maximum output current rating for the LT8625SPJV#TRMPBF?
The LT8625SPJV#TRMPBF is rated for 8A maximum continuous output current under typical thermal conditions (θJA = 30°C/W on demo board). Derating applies above 125°C junction temperature; actual achievable current depends on PCB copper area, airflow, and input/output voltage differential. The top MOSFET current limit is 13.5A–17.5A, and bottom switch limit is 9.25A–13.75A.
Does the LT8625SPJV#TRMPBF support remote sensing, and how is it implemented?
Yes, the LT8625SPJV#TRMPBF supports true remote sensing via the OUTS (Pin 13) and PGFB (Pin 14) pins. OUTS connects directly to the load point as the inverting input of the error amplifier, enabling Kelvin sensing to reject PCB trace IR drop. This ensures ±0.8% output accuracy at the load under varying current and thermal conditions.
How does the LT8625SPJV#TRMPBF achieve ultralow output noise of 3.5μVRMS?
The LT8625SPJV#TRMPBF achieves 3.5μVRMS (10Hz–100kHz) through three integrated techniques: (1) an ultralow-noise 100µA SET-pin reference, (2) third-generation Silent Switcher architecture with internal bypass capacitors to suppress common-mode EMI, and (3) a dedicated low-noise SVIN supply path isolated from noisy power switches. These features eliminate need for post-regulation filtering in sensitive analog rails.
Can the LT8625SPJV#TRMPBF be synchronized to an external clock, and which pin controls this?
Yes, the LT8625SPJV#TRMPBF supports external synchronization via the SYNC/MODE pin (Pin 17). When driven with a TTL- or CMOS-compatible clock signal, the device locks its internal oscillator to the external frequency and operates in Forced Continuous Mode. This enables deterministic EMI placement and multi-phase alignment across multiple LT8625SPJV#TRMPBF units.
What thermal considerations apply to the LT8625SPJV#TRMPBF's exposed pad (Pin 21)?
The exposed pad (Pin 21) of the LT8625SPJV#TRMPBF must be soldered to a solid PCB ground plane to achieve θJC(pad) = 12.8°C/W. Leaving it unconnected degrades thermal resistance by >3× and risks thermal shutdown under 6A+ loads. Recommended layout includes ≥4 thermal vias (0.3mm diameter) connecting the pad to inner ground layers, per Analog Devices' DC3002A demo board guidelines.
LT8625SPJV#TRMPBF 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:
- -
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- 8A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (3x4)
LT8625SPJV#TRMPBF FAQ
1.How can I place an order for LT8625SPJV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8625SPJV#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#TRMPBF reliable?
The price and inventory of LT8625SPJV#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8625SPJV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8625SPJV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8625SPJV#TRMPBF?
LT8625SPJV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8625SPJV#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#TRMPBF?
For technical support, including LT8625SPJV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8625SPJV#TRMPBF requirements.
6.How does Aetrix verify that LT8625SPJV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8625SPJV#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8625SPJV#TRMPBF?
All LT8625SPJV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8625SPJV#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#TRMPBF part is unused and in its original packaging.
Return procedure for LT8625SPJV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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