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Analog Devices Inc. LT8625SIV#TRMPBF
- Part No.:
- LT8625SIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8625SIV#TRMPBF.pdf
- Description:
- IC REG BUCK 8A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:216
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Product details
Overview
LT8625SIV#TRMPBF from Analog Devices is a 18V/8A synchronous step-down Silent Switcher 3 regulator featuring ultralow noise reference (4μVRMS, 10Hz–100kHz), 15ns minimum on-time, and internal bypass capacitors for EMI reduction. It delivers high efficiency at up to 4MHz switching frequency and supports remote sensing for ±0.8% output voltage accuracy over temperature in noise-sensitive RF power supplies and precision data converters.
For engineers reviewing the LT8625SIV#TRMPBF datasheet, LT8625SIV#TRMPBF pinout, LT8625SIV#TRMPBF application, or LT8625SIV#TRMPBF equivalent, key selection considerations include its 4mm × 3mm LQFN package with exposed GND pad, programmable 300kHz–4MHz frequency via RT resistor, forced continuous/pulse-skipping mode control, and PolyPhase® capability for multi-phase current sharing.
Technical Context
The LT8625SIV#TRMPBF implements third-generation Silent Switcher architecture with integrated ultralow-noise reference and internal bypass capacitors to suppress radiated EMI without external filters. Its current-mode control loop uses a PNP/NPN dual-input error amplifier that auto-switches based on SVIN–VSET differential, enabling stable regulation down to 0V output while maintaining low noise across input/output conditions.
It supports dynamic output voltage control via SET pin current (100µA typ), programmable power good with ±7.5% threshold hysteresis, and ultrafast transient response (1µs) enabled by fast minimum on-time and internal 3.4V INTVCC regulator. The device operates from –40°C to 125°C junction temperature with thermal shutdown protection.
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 |
| Output Current | 8A continuous - enables single-chip high-current solutions for FPGA core rails or RF power stages |
| Output Noise (RMS) | 3.5μVRMS (10Hz–100kHz) - meets stringent low-noise requirements for VCOs and ADC/DAC analog supplies |
| Switching Frequency | 300kHz to 4MHz - allows optimization of size vs. efficiency; 4MHz operation enables sub-1µH inductors |
| Min On-Time | 15ns - supports high step-down ratios (e.g., 12V→1V at 2MHz) without pulse skipping |
| Reference Accuracy | ±0.8% over temperature with remote sense - ensures tight regulation under load/thermal variation |
| 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
LT8625SIV#TRMPBF is housed in a 20-lead 4mm × 3mm × 0.94mm LQFN package with exposed thermal pad (Pin 21) soldered to PCB ground for optimal thermal performance. The package complies with JEDEC standards and MSL Level 3 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pins 1, 20) | Power switch node | Connects directly to inductor; must be minimized on PCB to reduce EMI and switching losses |
| GND (Pins 3, 4, 21) | Ground reference | Exposed pad (Pin 21) is mandatory GND connection for thermal and electrical integrity |
| PVIN (Pins 5–6) | Main power input | Supplies top MOSFET and internal circuitry; requires ≥4.7µF local ceramic bypass |
| SVIN (Pin 7) | Signal input rail | Must exceed VSET by ≥400mV; powers reference and error amp for precision regulation |
| SET (Pin 11) | Voltage setpoint input | Sources 100µA current; output voltage = 100µA × RSET; bypass capacitor reduces noise |
| VC (Pin 12) | Error amplifier output | Controls peak switch current; RC network from VC to GND sets loop compensation |
| OUTS (Pin 13) | Remote output sense | Kelvin-connected to load for accurate regulation despite PCB trace resistance |
| PGFB (Pin 14) | Power good feedback | Programmable threshold (0.5V ±7.5%) enables custom power-good signaling and fast start-up activation |
| RT (Pin 15) | Frequency programming | Resistor to GND sets fSW: 392kΩ → 300kHz, 47kΩ → 2MHz, 18kΩ → 4MHz |
| SYNC/MODE (Pin 17) | Operating mode control | GND = pulse-skipping; float or >1.5V = forced continuous; external clock = synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow RMS noise | 3.5μVRMS (10Hz–100kHz) - enables direct powering of PLLs and LNAs without post-regulation LDOs |
| Silent Switcher 3 architecture | Integrated bypass capacitors and optimized layout minimize radiated EMI without external filters |
| PolyPhase® operation | CLKOUT pin provides synchronized 50% duty-cycle clock for up to 12-phase interleaving |
| Fast transient response | 1µs recovery time - maintains regulation during rapid load steps in FPGA or ASIC core supplies |
| Dynamic output control | SET pin current (100µA) allows real-time voltage adjustment via DAC-controlled RSET |
| Thermal robustness | Rated for –40°C to 125°C junction temperature with internal thermal shutdown |
Applications
| RF Power Supplies | High-Speed Data Converters |
|---|---|
Use Scenario: Powering VCOs, mixers, and low-noise amplifiers in 5G base station transceivers. IC Role / Device Role / Timing Role: Primary DC/DC converter delivering ultra-low-noise 1.2V/3.3V bias rails with <4nV/√Hz spot noise at 10kHz. Use Value: Eliminates need for secondary LDO filtering, reducing BOM count and board area while meeting -160dBc/Hz phase noise targets. | Use Scenario: Supplying analog and digital domains of 16-bit+ SAR ADCs and high-speed DACs in test equipment. IC Role / Device Role / Timing Role: Synchronous buck regulator providing isolated, low-ripple 1.8V/3.3V supplies with remote sensing for <0.01% line/load regulation. Use Value: Maintains ENOB >15.5 bits by limiting integrated output noise to ≤3.5μVRMS across full bandwidth. |
| Low-Noise Instrumentation | Industrial Control Systems |
Use Scenario: Biasing precision op-amps and reference buffers in portable multimeters and calibration sources. IC Role / Device Role / Timing Role: High-efficiency, low-noise point-of-load regulator operating from 3.3V–12V inputs with programmable PG signal. Use Value: Achieves <0.5ppm/°C drift contribution via ±0.8% reference accuracy and Kelvin-sense topology. | Use Scenario: Powering microcontrollers and I/O interfaces in PLC modules requiring long-term reliability. IC Role / Device Role / Timing Role: Robust 8A buck converter with thermal shutdown, UVLO hysteresis (50mV), and 125°C rated operation. Use Value: Ensures uninterrupted operation in enclosed cabinets where ambient temperatures exceed 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3310S | 4A max output, 2.25V–5.5V input, 5MHz max fSW, no integrated bypass caps | Better suited for low-voltage, high-frequency applications; lacks Silent Switcher 3 EMI suppression | Select when input voltage is limited to ≤5.5V and lower current suffices |
| LT8645S | 10A output, same 2.7V–18V input, identical Silent Switcher 3 architecture and pinout | Direct upgrade path for higher current needs; shares layout and compensation design | Choose for designs scaling beyond 8A while retaining noise/EMI performance |
Compared with LTC3310S, LT8625SIV#TRMPBF delivers 2× output current and superior EMI performance due to integrated bypass capacitors; versus LT8645S, it offers identical feature set at lower current rating, enabling cost-optimized BOMs where 8A is sufficient.
Availability
LT8625SIV#TRMPBF is available at Aetrix Electronics and suitable for RF power supplies, high-speed data converters, and low-noise instrumentation requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LT8625SIV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision, industrial, communications, and automotive markets.
The LT8625SIV#TRMPBF belongs to the Silent Switcher® 3 product line, engineered specifically for ultra-low-noise, high-efficiency power conversion in RF, instrumentation, and high-speed data acquisition systems.
FAQ
What is the maximum continuous output current supported by the LT8625SIV#TRMPBF?
The LT8625SIV#TRMPBF supports 8A maximum continuous output current under proper thermal conditions-specifically with the exposed GND pad (Pin 21) soldered to a sufficient copper area. Derating applies above 125°C junction temperature, and actual achievable current depends on input voltage, output voltage, ambient temperature, and PCB thermal design per the θJA = 46°C/W specification.
How does the LT8625SIV#TRMPBF achieve ultralow output noise compared to standard buck regulators?
The LT8625SIV#TRMPBF achieves 3.5μVRMS (10Hz–100kHz) output noise through third-generation Silent Switcher architecture, an ultralow-noise 100µA reference, internal bypass capacitors that suppress high-frequency switching noise, and a unique error amplifier design that minimizes thermal and flicker noise contributions. Unlike conventional regulators, its noise remains nearly constant across output voltages due to current-mode reference programming.
Can the LT8625SIV#TRMPBF be synchronized to an external clock, and how is this configured?
Yes, the LT8625SIV#TRMPBF can be synchronized to an external clock via the SYNC/MODE pin (Pin 17). Driving this pin with a clean CMOS-level clock signal forces the device into synchronization mode while maintaining forced continuous operation. The internal oscillator locks to the external frequency, enabling precise phase alignment in PolyPhase® multi-phase configurations or EMI spread-spectrum coordination.
What is the purpose of the SVIN pin on the LT8625SIV#TRMPBF, and what happens if it is tied directly to PVIN?
The SVIN pin powers the precision reference and error amplifier circuitry and must be ≥400mV above the SET pin voltage to ensure proper operation. If tied directly to PVIN, SVIN meets this requirement only when PVIN exceeds VSET + 0.4V; otherwise, regulation fails or noise increases. For fixed-output designs, SVIN should be connected to a clean, regulated rail-such as a dedicated LDO-rather than raw PVIN, especially at low VOUT.
Does the LT8625SIV#TRMPBF support remote sensing, and how is it implemented?
Yes, the LT8625SIV#TRMPBF supports true remote sensing via the OUTS pin (Pin 13), which connects directly to the load's high-side return point. This Kelvin connection compensates for voltage drop across PCB traces and connectors, ensuring ±0.8% output accuracy under varying load currents. For best results, the OUTS trace must be routed separately from power paths and tied to the same ground node as the SET resistor's ground terminal.
LT8625SIV#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:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (4x3)
LT8625SIV#TRMPBF FAQ
1.How can I place an order for LT8625SIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8625SIV#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 LT8625SIV#TRMPBF reliable?
The price and inventory of LT8625SIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8625SIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8625SIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8625SIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8625SIV#TRMPBF?
LT8625SIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8625SIV#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 LT8625SIV#TRMPBF?
For technical support, including LT8625SIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8625SIV#TRMPBF requirements.
6.How does Aetrix verify that LT8625SIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8625SIV#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 LT8625SIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8625SIV#TRMPBF?
All LT8625SIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8625SIV#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 LT8625SIV#TRMPBF part is unused and in its original packaging.
Return procedure for LT8625SIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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