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Analog Devices Inc. LT8622SAV#PBF
- Part No.:
- LT8622SAV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-TFQFN Exposed Pad
- Datasheet:
-
LT8622SAV#PBF.pdf
- Description:
- IC REG BUCK ADJ 2A 20LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:354
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Product details
Overview
LT8622SAV#PBF from Analog Devices is a 18V, 2A synchronous step-down DC/DC regulator featuring Silent Switcher®3 architecture, 4μVRMS output noise (10Hz–100kHz), and 12ns minimum on-time, designed for powering noise-sensitive RF and precision analog circuits such as VCOs, PLLs, and high-speed ADCs.
For engineers reviewing the LT8622SAV#PBF datasheet, LT8622SAV#PBF pinout, LT8622SAV#PBF application, or LT8622SAV#PBF equivalent, key selection criteria include ultralow RMS noise performance, differential remote sense accuracy, PolyPhase® scalability up to 12 phases, and operation across 300kHz–6MHz with external synchronization capability.
Technical Context
The LT8622SAV#PBF integrates an ultralow-noise 100μA ±0.8% precision current reference and a high-gain error amplifier enabling ultrafast transient response. Its Silent Switcher®3 architecture uses internal bypass capacitors and optimized layout to suppress radiated EMI without requiring special PCB design.
It supports forced continuous conduction mode, adjustable switching frequency (300kHz–6MHz), and programmable power good with differential remote sensing-ensuring ±0.75% output voltage accuracy over line, load, and temperature across its 0V to (PVIN − 0.5V) output range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 18V - supports wide-input industrial and automotive supply rails without pre-regulation. |
| Max Continuous Output Current | 2A - sufficient for dual-channel RF synthesizers or multi-rail precision data converters. |
| RMS Output Noise (10Hz–100kHz) | 4μVRMS - enables direct powering of VCOs and LNAs without post-regulation LDOs. |
| Min Switch On-Time | 12ns - allows stable 2MHz+ operation even at low duty cycles (e.g., 5VOUT from 12VIN). |
| Switching Frequency Range | 300kHz to 6MHz - selectable via RT resistor or external clock sync for EMI band avoidance. |
| Reference Accuracy | 100μA ±0.8% over temperature - ensures <±0.75% output regulation with differential remote sense. |
| PolyPhase® Support | Up to 12 phases - enables coherent interleaving for >24A systems with reduced input/output ripple. |
Pinout & Package
LT8622SAV#PBF is housed in a thermally enhanced 20-lead 4mm × 3mm LQFN package with exposed pad (no backside thermal pad per datasheet note for LT8622S variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch Node | Connects to external inductor; carries high di/dt switching waveform-requires tight layout and ground stitching. |
| OUTS | Power Output Sense | Differential remote sense input referenced to GND; enables accurate regulation at load point. |
| PGFB | Power Good Feedback | Resistor-divider input for programmable power-good threshold; open-drain PG output asserted when VOUT is in regulation. |
| EN/UVLO | Enable & Input Undervoltage Lockout | Active-high enable with adjustable UVLO threshold via external resistor divider on PVIN. |
| RT | Frequency Setting | Connects to resistor-to-GND to set switching frequency from 300kHz to 6MHz. |
| VC | Error Amplifier Compensation | Access to error amp output for Type II/III compensation network placement. |
| SET | Current Reference Set | Connects to external resistor to program 100μA reference current for output voltage scaling. |
| GND | Power & Signal Ground | Common return for power paths and analog circuitry; must be tied to exposed pad for thermal and noise integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®3 Architecture | Integrates internal bypass capacitors and symmetrical layout to reduce common-mode EMI by >30dB vs. conventional buck regulators. |
| Ultralow Spot Noise (4nV/√Hz @ 10kHz) | Preserves phase noise performance in VCOs and jitter-sensitive clock distribution networks. |
| Differential Remote Sense | Maintains ±0.75% output accuracy despite PCB trace IR drop up to 100mV between IC and load. |
| Adjustable Power Good Threshold | Allows precise sequencing control in multi-rail systems without external comparators. |
| Forced Continuous Mode | Eliminates mode transitions and associated noise spikes during light-load operation in sensitive analog stages. |
Applications
| RF Power Supply | High-Speed Data Converter |
|---|---|
Use Scenario: Powering a 12GHz PLL synthesizer with integrated VCO requiring sub-100fs integrated jitter. IC Role / Device Role / Timing Role: Primary clean power source for VCO core and charge pump, delivering ultralow broadband noise. Use Value: 4μVRMS noise prevents degradation of VCO phase noise floor; differential sense maintains regulation under dynamic current steps. | Use Scenario: Supplying AVDD and DVDD rails for a 16-bit, 125MSPS pipeline ADC in medical imaging front-end. IC Role / Device Role / Timing Role: Low-noise analog and digital supply regulator with independent output tracking and fast transient response. Use Value: 12ns min on-time enables 3MHz switching at 1.8VOUT/12VIN, reducing output capacitor count while maintaining <1LSB noise floor. |
| Low-Noise Instrumentation | Multi-Phase Power System |
Use Scenario: Biasing low-noise op-amps and precision references in portable spectrum analyzers. IC Role / Device Role / Timing Role: Ultraquiet local regulator replacing discrete LDO + buck cascades to minimize board area and thermal load. Use Value: Eliminates need for post-buck LDOs due to 4nV/√Hz spot noise-reducing component count and power loss by ~15%. | Use Scenario: Scalable core voltage supply for FPGA-based radar processing with 12-phase interleaved architecture. IC Role / Device Role / Timing Role: One phase of a synchronized PolyPhase® array; shares clock and phase-offset signals with other LT8622SAV#PBF units. Use Value: Enables 24A total output with <10mVpp input ripple and 3× reduction in output capacitor ESR requirements vs. single-phase design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8624SAV#PBF | 4A output rating, identical pinout and feature set; same 20-lead 4mm × 3mm LQFN package. | Supports higher-current loads (e.g., multi-core SoCs, high-power PA bias) without redesign. | Select when ≥3A continuous load current is required; no PCB change needed. |
| LT8650SIV#PBF | 2-phase, 4A/channel monolithic controller; includes integrated drivers but requires external MOSFETs. | Better suited for >10A applications where thermal management and layout flexibility outweigh BOM simplicity. | Choose for scalable, thermally distributed designs where efficiency >95% at 5A+ is critical. |
Compared with LT8624SAV#PBF, the LT8622SAV#PBF trades output current headroom for lower quiescent current and smaller solution size; versus LT8650SIV#PBF, it offers simpler implementation and lower EMI in space-constrained RF modules where 2A suffices.
Availability
LT8622SAV#PBF is available at Aetrix Electronics and suitable for RF power supplies, high-speed data converter rails, and low-noise instrumentation requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for LT8622SAV#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 LT8622SAV#PBF belongs to the Silent Switcher®3 family-engineered specifically for noise-critical power delivery in RF, precision measurement, and high-speed communication systems.
FAQ
What is the maximum input voltage rating for LT8622SAV#PBF?
The LT8622SAV#PBF supports an absolute maximum input voltage of 18V across its PVIN and SVIN pins. Operation above this level risks permanent damage. The recommended operating range is 2.7V to 18V, making it suitable for 12V industrial rails and battery-backed systems with transient protection. Always observe derating guidelines in the official datasheet for sustained high-temperature operation.
Does LT8622SAV#PBF require external compensation components?
Yes, the LT8622SAV#PBF requires external compensation on the VC pin to stabilize the control loop. A standard Type II network (resistor + capacitor from VC to GND, plus series RC from VC to OUTS) is used. The datasheet provides design equations and example values based on output capacitance and ESR. Omitting compensation may cause instability or excessive output voltage overshoot during load transients.
Can LT8622SAV#PBF synchronize to an external clock?
Yes, the LT8622SAV#PBF supports external clock synchronization via the RT pin. Applying a CMOS-compatible square wave (300kHz–6MHz) to RT overrides the internal oscillator and locks switching edges to the external source. This capability is essential for EMI reduction in dense PCB layouts and for coherent multiphase operation in PolyPhase® configurations using multiple LT8622SAV#PBF units.
Is LT8622SAV#PBF pin-compatible with other members of the LT862xS family?
Yes, the LT8622SAV#PBF is pin-to-pin compatible with LT8624SAV#PBF, LT8625SAV#PBF, and LT8625SPAV#PBF per the datasheet note. All share identical 20-lead 4mm × 3mm LQFN footprints and pin functions. This allows scalable design reuse-e.g., prototyping with LT8622SAV#PBF and upgrading to 4A or 8A variants without layout changes.
What thermal performance can be expected from LT8622SAV#PBF in a 4-layer PCB?
In a standard 4-layer PCB with 2oz copper, 1-in² exposed thermal pad connected to internal ground planes, the LT8622SAV#PBF achieves θJA ≈ 38°C/W. At 2A load and 12VIN→3.3VOUT, junction temperature rise remains below 45°C at 25°C ambient-well within its 125°C maximum junction rating. Thermal relief vias under the exposed pad are strongly recommended to maintain reliability under continuous full-load operation.
LT8622SAV#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:
- 2A
- 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)
LT8622SAV#PBF FAQ
1.How can I place an order for LT8622SAV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8622SAV#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 LT8622SAV#PBF reliable?
The price and inventory of LT8622SAV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8622SAV#PBF is usually 5 days.
3.What payment methods are accepted for LT8622SAV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8622SAV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8622SAV#PBF?
LT8622SAV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8622SAV#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 LT8622SAV#PBF?
For technical support, including LT8622SAV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8622SAV#PBF requirements.
6.How does Aetrix verify that LT8622SAV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8622SAV#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 LT8622SAV#PBF meets industry standards.
7.What is the process for return or replacement of LT8622SAV#PBF?
All LT8622SAV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8622SAV#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 LT8622SAV#PBF part is unused and in its original packaging.
Return procedure for LT8622SAV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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