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Analog Devices Inc. LT8624SAV#PBF
- Part No.:
- LT8624SAV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8624SAV#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:296
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Product details
Overview
LT8624SAV#PBF from Analog Devices is a 18V, 4A synchronous step-down DC/DC regulator featuring Silent Switcher®3 architecture, ultralow RMS noise (4μVRMS, 10Hz–100kHz), and precision current reference (100μA ±0.8% over temperature). It delivers high efficiency at up to 6MHz switching frequency and supports differential remote sense for load regulation accuracy in RF power supplies.
For engineers reviewing the LT8624SAV#PBF datasheet, LT8624SAV#PBF pinout, LT8624SAV#PBF application, or LT8624SAV#PBF equivalent, key selection criteria include its 4A continuous output capability, 12ns minimum on-time, PolyPhase® scalability up to 12 phases, and internal INTVCC capacitor eliminating external bias supply requirements.
Technical Context
The LT8624SAV#PBF integrates a high-gain error amplifier enabling ultrafast transient response and operates with forced continuous mode or pulse-skipping mode. Its Silent Switcher®3 architecture combines internal bypass capacitors and optimized layout to suppress radiated EMI without requiring special PCB design techniques.
It supports adjustable switching frequency from 300kHz to 6MHz via external RT resistor, offers programmable power good with adjustable threshold, and uses a single-resistor output voltage programming scheme that maintains constant output noise across the full 0V to (PVIN – 0.5V) range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 18V - supports wide-input industrial and automotive rails without pre-regulation |
| Max Continuous Output Current | 4A - enables single-chip power delivery for high-current analog/RF loads |
| RMS Output Noise (10Hz–100kHz) | 4μVRMS - meets stringent low-noise requirements for VCOs and high-speed ADCs |
| Min Switch On-Time | 12ns - allows high-step-down ratio operation at 2MHz+ frequencies (e.g., 12V→1.2V) |
| Switching Frequency Range | 300kHz to 6MHz - selectable via RT resistor; enables optimization of size vs. efficiency |
| Reference Accuracy | 100μA ±0.8% over temperature - ensures stable output voltage under thermal stress |
| PolyPhase® Support | Up to 12 phases - enables parallel operation for >48A systems with interleaved ripple cancellation |
Pinout & Package
LT8624SAV#PBF is housed in a 20-lead 4mm × 3mm LQFN package with exposed pad (no thermal backside connection per datasheet note for LT8624S variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch Node | Connects to external inductor; carries high di/dt switching current |
| OUTS | Power Output Sense | Differential remote sense input for accurate load regulation independent of PCB trace IR drop |
| PGFB | Power Good Feedback | Resistor-divider input for programmable power-good threshold and delay |
| EN/UVLO | Enable / Undervoltage Lockout | Active-high enable with adjustable UVLO threshold via external resistor divider |
| RT | Frequency Set | Connects to external resistor to set switching frequency from 300kHz to 6MHz |
| VC | Error Amplifier Output | Accessible compensation node for custom loop shaping and stability control |
| SET | Current Reference Set | Connects to external resistor to program output voltage via unity-gain configuration |
| GND | Power Ground | Primary return path for high-current switch and IC ground planes |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®3 Architecture | Integrates internal bypass capacitors and symmetric layout to reduce common-mode EMI by >30dB vs. conventional buck regulators |
| Ultralow Spot Noise | 4nV/√Hz at 10kHz - preserves signal integrity in sensitive RF front-end biasing |
| Differential Remote Sense | Compensates for up to 100mV IR drop between regulator and load, ensuring ±0.5% output accuracy under dynamic load |
| Adjustable Power Good | Programmable threshold and delay allow precise sequencing with FPGA or ASIC power rails |
| Forced Continuous Mode | Eliminates mode transitions during light-load operation, preventing audible noise and output voltage perturbation |
Applications
| RF Power Supply | High-Speed Data Converter Bias |
|---|---|
Use Scenario: Powering phase-locked loops (PLLs) and voltage-controlled oscillators (VCOs) in microwave transceivers. IC Role / Device Role / Timing Role: Primary low-noise core supply delivering clean 3.3V or 5V to RF synthesizer blocks. Use Value: 4μVRMS noise ensures <−160dBc/Hz phase noise floor, directly improving spectral purity and adjacent channel rejection. | Use Scenario: Providing analog supply rails to 16-bit+ SAR and pipeline ADCs/DACs in test equipment. IC Role / Device Role / Timing Role: High-stability, low-ripple VDDA source decoupled from digital switching noise. Use Value: Maintains ENOB ≥15.2 bits at 10MSPS by limiting supply-induced harmonic distortion below −100dB. |
| Low-Noise Instrumentation | Multi-Phase Power System |
Use Scenario: Biasing low-noise amplifiers (LNAs) and precision op-amps in portable spectrum analyzers. IC Role / Device Role / Timing Role: Ultraquiet auxiliary rail generator replacing linear regulators to avoid thermal derating at 4A loads. Use Value: Achieves 120dB PSRR at 100kHz while delivering 4A, enabling >120dB dynamic range without heatsink penalties. | Use Scenario: Scaling output current beyond 4A using PolyPhase® synchronization in FPGA acceleration cards. IC Role / Device Role / Timing Role: Master phase controller coordinating up to 12 synchronized LT8624SAV#PBF units with 30° phase shift. Use Value: Reduces input/output capacitor RMS current by 92%, cuts total ripple amplitude by 75%, and lowers thermal hotspot density. |
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 |
|---|---|---|---|
| LT8622SAV#PBF | 2A max output current; identical pinout, noise performance, and feature set except current rating | Suitable for lower-power RF sections where 4A headroom is unnecessary | Select when system load is ≤2A and board space or cost optimization is prioritized |
| LT8625SAV#PBF | 8A max output; same package footprint but rated for 125°C ambient (vs. 125°C for LT8624SAV#PBF); no exposed backside pad | Required for high-density compute modules needing >4A per rail with minimal area increase | Choose when future-proofing for higher current or consolidating multiple rails into one |
Compared with LT8622SAV#PBF and LT8625SAV#PBF, the LT8624SAV#PBF uniquely balances 4A capability with ultralow noise and compact 4mm × 3mm footprint-making it optimal for space-constrained, noise-sensitive 5G infrastructure and medical imaging subsystems where 2A is insufficient and 8A is over-provisioned.
Availability
LT8624SAV#PBF is available at Aetrix Electronics and suitable for RF power supplies, high-speed data converter biasing, and low-noise instrumentation requiring stable component supply and long-term production continuity.
Supply support for LT8624SAV#PBF 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, headquartered in Wilmington, MA.
The LT862xS family was designed specifically for noise-critical power delivery in RF, precision measurement, and high-speed signal chain applications-integrating Silent Switcher®3 and ultralow-noise references to replace LDOs in high-current scenarios.
FAQ
What is the maximum junction temperature rating for LT8624SAV#PBF?
The LT8624SAV#PBF is rated for operation up to 125°C junction temperature, as confirmed in the official Analog Devices datasheet revision Sp0. This rating applies across its full input voltage range (2.7V to 18V) and 4A load condition. Thermal derating begins above this limit, and the device incorporates thermal shutdown protection to prevent damage. Designers should verify PCB copper area and airflow to maintain LT8624SAV#PBF junction temperature within specification under worst-case ambient conditions.
Does LT8624SAV#PBF require an external INTVCC capacitor?
No, the LT8624SAV#PBF integrates the INTVCC capacitor internally, eliminating the need for an external bias supply capacitor. This simplifies layout, reduces BOM count, and improves reliability compared to earlier Silent Switcher generations. The internal capacitor supports the gate driver and internal circuitry across the full operating temperature range, and no external component is specified or recommended in the LT8624SAV#PBF datasheet for this function.
Can LT8624SAV#PBF be synchronized to an external clock?
Yes, the LT8624SAV#PBF supports external synchronization via its RT pin, accepting a CMOS-compatible clock signal from 300kHz to 6MHz. When synchronized, the LT8624SAV#PBF aligns its switching edge to the external clock's rising edge, enabling EMI reduction through frequency coordination and facilitating PolyPhase® interleaving with other LT862xS devices. No additional components are required beyond the clock source connection to the RT pin.
What is the purpose of the OUTS pin on LT8624SAV#PBF?
The OUTS pin on LT8624SAV#PBF provides differential remote sensing of the output voltage at the load, separate from the main output (OUT) connection. It works with the PGFB pin to form a Kelvin sense pair, compensating for voltage drop across PCB traces and connectors. This ensures ±0.5% output regulation accuracy at the load point under dynamic current conditions, which is critical for RF and precision analog applications powered by the LT8624SAV#PBF.
Is LT8624SAV#PBF pin-compatible with other members of the LT862xS family?
Yes, the LT8624SAV#PBF is pin-to-pin compatible with the LT8622SAV#PBF, LT8625SAV#PBF, and LT8625SP, as explicitly stated in the datasheet note: "The LT8622S/LT8624S/LT8625S/LT8625SP are Pin-to-Pin Compatible." This allows direct substitution in existing layouts when scaling current capability, provided thermal and layout constraints for the higher-current variants are verified.
LT8624SAV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®3
- Package/Case:
- 20-TFQFN Exposed Pad
- Packaging:
- Tray
- 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:
- 4A
- Frequency - Switching:
- 300kHz ~ 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-LQFN (4x3)
LT8624SAV#PBF FAQ
1.How can I place an order for LT8624SAV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8624SAV#PBF 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 LT8624SAV#PBF reliable?
The price and inventory of LT8624SAV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8624SAV#PBF is usually 5 days.
3.What payment methods are accepted for LT8624SAV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8624SAV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8624SAV#PBF?
LT8624SAV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8624SAV#PBF 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 LT8624SAV#PBF?
For technical support, including LT8624SAV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8624SAV#PBF requirements.
6.How does Aetrix verify that LT8624SAV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8624SAV#PBF 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 LT8624SAV#PBF meets industry standards.
7.What is the process for return or replacement of LT8624SAV#PBF?
All LT8624SAV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8624SAV#PBF, 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 LT8624SAV#PBF part is unused and in its original packaging.
Return procedure for LT8624SAV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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