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Analog Devices Inc. LT8652SIV#PBF
- Part No.:
- LT8652SIV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-TFQFN Exposed Pad
- Datasheet:
-
LT8652SIV#PBF.pdf
- Description:
- IC REG BUCK 0.6V DL 36LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:348
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Product details
Overview
LT8652SIV#PBF from Analog Devices is a dual-channel synchronous step-down Silent Switcher regulator delivering up to 8.5A per channel continuously (17A combined), with 16µA quiescent current in Burst Mode, 1.5MHz switching frequency, and ±1.2% feedback voltage accuracy. It serves as a high-efficiency, low-EMI power supply core for FPGA, ASIC, and SoC rails in server and telecom infrastructure.
For engineers reviewing the LT8652SIV#PBF datasheet, LT8652SIV#PBF pinout, LT8652SIV#PBF application, or LT8652SIV#PBF equivalent, key selection criteria include dual-channel current capability (8.5A × 2), Silent Switcher®2 EMI performance, internal/external compensation flexibility, output current monitoring via IMON pins, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT8652SIV#PBF implements second-generation Silent Switcher architecture with integrated bypass capacitors and spread-spectrum frequency modulation to suppress radiated EMI without requiring complex PCB layout mitigation. Its dual independent buck channels share no critical analog circuitry except GND and VCC, enabling true independent regulation and fault isolation.
Each channel features a dedicated error amplifier (VC1/VC2), remote sense inputs (SNSGND1/SNSGND2), programmable soft-start (SS1/SS2), and average output current monitoring (IMON1/IMON2) with 1.0V current-limit reference. The device supports forced continuous mode (FCM), Burst Mode operation, and external clock synchronization (SYNC/CLKOUT) for multi-phase interleaving up to 4-phase.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8.5A per channel continuous; enables dual-rail power delivery for high-performance processors without external current sharing. |
| Quiescent Current | 16µA (both channels regulating 12VIN→3.3VOUT); sustains ultra-low-power standby in always-on systems. |
| Switching Frequency | 300kHz–3MHz (RT-programmable); allows optimization of size vs. efficiency-e.g., 1.5MHz enables compact 0.3µH inductors. |
| Feedback Accuracy | ±1.2% at 600mV reference; ensures tight output regulation across line/load/temperature for sensitive digital loads. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum; eliminates need for external EMI filters in automotive infotainment designs. |
| Package | 36-pin LQFN (4mm × 7mm × 0.94mm); exposes 6 GND pads (pins 37–42) for low thermal resistance (θJCbot = 4.2°C/W). |
| Operating Temp | –40°C to +125°C junction; qualified per AEC-Q100 Grade 1, supporting under-hood automotive applications. |
Pinout & Package
LT8652SIV#PBF uses a 36-pin LQFN package (4mm × 7mm, 0.94mm height) with exposed thermal pad (pins 37–42) soldered to PCB ground for optimal thermal performance (θJCbot = 4.2°C/W). Pin functions are validated per Analog Devices' official datasheet Rev. B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IMON1 (Pin 30) | Channel 1 average output current monitor | Outputs current proportional to IOUT1; 1.0V threshold sets current limit via RIMON = 78kΩ/ILIM - enables precise overcurrent protection. |
| SS1 (Pin 29) | Channel 1 soft-start and tracking control | 0–0.6V range forces FB1 to track SS1 voltage; internal 2µA pull-up enables capacitor-programmed slew rate for controlled startup. |
| VIN1 (Pins 5,6,7) | Channel 1 input power supply | Supplies internal circuitry and top FET of Channel 1; must be ≥3.0V and locally bypassed to minimize noise injection. |
| FB1 (Pin 32) | Channel 1 feedback input | Regulated to 600mV ±1.2% referenced to SNSGND1; supports Kelvin remote sensing for <1% load regulation error at 8.5A. |
| PG1 (Pin 16) | Channel 1 power-good indicator | Open-drain output asserts high when FB1 is within ±7% of target and no faults (UVLO, thermal shutdown, EN low) are present. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 architecture | Integrated bypass capacitors + differential SW routing reduce peak radiated EMI by >30dB vs. prior generation - passes CISPR 25 Class 5 without shielding. |
| Dual independent current monitoring | IMON1/IMON2 pins provide real-time average current readback with <5% error across –40°C to 125°C - enables dynamic load balancing and telemetry. |
| Multi-phase CLKOUT support | CLKOUT outputs 90° phase-shifted 50% duty cycle square wave in FCM; enables seamless 4-phase interleaving with up to three additional LT8652S devices. |
| Flexible compensation | VC1/VC2 pins support internal (connect to VCC) or external compensation - internal option reduces Burst Mode IQ to 12.8µA/channel. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +125°C junction temperature with full parametric testing - suitable for ADAS domain controllers and infotainment SoCs. |
Applications
| Server CPU Core Rails | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Powering dual-core 3.3V/1.0V rails for Xeon D-2700 processors in edge servers with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator delivering tightly regulated, low-noise power with independent transient response per rail. Use Value: 93.6% efficiency at 6A/3.3V from 12VIN enables passive cooling; 16µA IQ extends battery-backed uptime during maintenance windows. | Use Scenario: Supplying 1.2V/8.5A and 3.3V/8.5A to NVIDIA Orin SoC in autonomous driving ECUs operating in engine bay environments. IC Role / Device Role / Timing Role: AEC-Q100 qualified dual buck controller managing safety-critical power domains with independent PG signaling and thermal monitoring. Use Value: TEMP pin (250mV @ 25°C, 11mV/°C) enables real-time junction temperature telemetry; spread-spectrum mode meets CISPR 25 Class 5 for radar coexistence. |
| FPGA I/O and Core Banks | 5G Baseband Radio Unit |
Use Scenario: Delivering 1.8V/8.5A and 1.0V/8.5A to Xilinx Versal ACAP with fast load-step requirements and minimal board area. IC Role / Device Role / Timing Role: High-bandwidth dual buck regulator with 20ns minimum on-time and fast transient response (<50µs recovery from 5A→10A step). Use Value: Forced Continuous Mode (FCM) ensures consistent loop bandwidth; differential sensing (SNSGND1/SNSGND2) maintains <±10mV regulation at point-of-load under 8.5A ripple current. | Use Scenario: Generating 1.2V/8.5A and 3.3V/8.5A for massive MIMO RF transceivers in O-RAN radios requiring ultra-low phase noise power. IC Role / Device Role / Timing Role: Low-EMI dual regulator powering PLLs and ADC/DAC chains where switching noise directly impacts EVM and ACLR. Use Value: Silent Switcher®2 architecture achieves <–60dBµV/m radiated emissions at 100MHz - eliminates need for ferrite beads or shielded inductors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GL-Z | Single-chip dual 12A solution with PMBus interface; lacks Silent Switcher EMI suppression and IMON current monitoring. | Best for digitally managed power systems requiring telemetry and sequencing; unsuitable for EMI-sensitive RF or automotive applications. | Select MP2918GL-Z only if PMBus telemetry and programmable margins outweigh EMI and analog monitoring needs. |
| TPS546D24RQFT | 6V–18V input, dual 10A output with integrated MOSFETs; higher IQ (25µA) and no spread-spectrum modulation. | Targeted at industrial PLCs with less stringent EMI requirements; lacks AEC-Q100 qualification and remote sense precision. | Choose TPS546D24RQFT for cost-sensitive industrial applications where thermal headroom exceeds 15°C and CISPR compliance is not required. |
Compared with MP2918GL-Z and TPS546D24RQFT, the LT8652SIV#PBF uniquely combines automotive qualification, sub-20µA IQ, and certified low-EMI operation - making it the only option for safety-critical, battery-backed, or RF-dense deployments demanding both efficiency and electromagnetic cleanliness.
Availability
LT8652SIV#PBF is available at Aetrix Electronics and suitable for server power applications, automotive ADAS systems, FPGA power delivery, and 5G radio units requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LT8652SIV#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, serving industrial, automotive, communications, and healthcare markets.
The LT8652SIV#PBF belongs to the Silent Switcher®2 power regulator family, engineered specifically for noise-sensitive applications such as high-speed data converters, PLLs, and automotive radar systems where EMI reduction and thermal efficiency are non-negotiable.
FAQ
What is the maximum continuous output current per channel for the LT8652SIV#PBF?
The LT8652SIV#PBF delivers up to 8.5A of continuous output current from each channel under typical thermal conditions (θJA = 18°C/W, 2-layer PCB). When both channels operate simultaneously at 8.5A, the device maintains regulation with proper heatsinking and airflow. Peak capability reaches 12A per channel for short durations, verified in the datasheet's "Top Power NMOS Current Limit" specification (22–32A range).
Does the LT8652SIV#PBF support remote voltage sensing, and how is it implemented?
Yes, the LT8652SIV#PBF supports true Kelvin remote sensing on both channels via dedicated SNSGND1 (Pin 33) and SNSGND2 (Pin 34) pins. Each feedback pin (FB1/FB2) is regulated to 600mV referenced precisely to its respective SNSGND pin. To implement remote sensing, connect the output capacitor ground terminal directly to SNSGND1/SNSGND2 using separate low-impedance traces - this compensates for IR drop in high-current PCB paths and ensures <±10mV regulation error at full 8.5A load.
How does the LT8652SIV#PBF achieve ultra-low EMI performance without external filtering?
The LT8652SIV#PBF achieves ultra-low EMI through Silent Switcher®2 architecture: integrated input bypass capacitors minimize high-di/dt loop area, symmetrical SW node routing cancels magnetic fields, and spread-spectrum frequency modulation smears spectral peaks. As validated in the datasheet's CISPR 25 radiated emission plots (Figures G51–G53), the LT8652SIV#PBF meets Class 5 limits with only a basic input filter - eliminating ferrite beads, common-mode chokes, or metal shielding typically required for high-current buck regulators.
Can the two channels of the LT8652SIV#PBF be paralleled for higher current, and what is required?
Yes, the two channels of the LT8652SIV#PBF can be combined into a single 17A output using interleaved phase operation. This requires connecting SW1 and SW2 together, tying FB1 and FB2 to a shared resistor divider, and synchronizing both channels via the SYNC pin. The CLKOUT pin provides a 90° phase-shifted clock to coordinate timing. Full implementation details-including inductor selection, current-sharing resistors, and stability compensation-are provided in the LT8652SIV#PBF datasheet's "Two-Phase Operation" section (Page 9).
What is the purpose of the TEMP pin (Pin 14) on the LT8652SIV#PBF, and how accurate is it?
The TEMP pin (Pin 14) on the LT8652SIV#PBF outputs a voltage linearly proportional to junction temperature: 250mV at 25°C with a slope of 11mV/°C. It is accurate to ±5°C over the full –40°C to +125°C range when the device operates in Forced Continuous Mode (FCM). In Burst Mode, the TEMP output is invalid below ~1A load due to internal bias current discontinuity - so FCM must be enabled for reliable thermal telemetry across the entire load range.
LT8652SIV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 36-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- -
- Current - Output:
- 8.5A, 8.5A
- Frequency - Switching:
- 300kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 36-LQFN (4x7)
LT8652SIV#PBF FAQ
1.How can I place an order for LT8652SIV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8652SIV#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 LT8652SIV#PBF reliable?
The price and inventory of LT8652SIV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8652SIV#PBF is usually 5 days.
3.What payment methods are accepted for LT8652SIV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8652SIV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8652SIV#PBF?
LT8652SIV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8652SIV#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 LT8652SIV#PBF?
For technical support, including LT8652SIV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8652SIV#PBF requirements.
6.How does Aetrix verify that LT8652SIV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8652SIV#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 LT8652SIV#PBF meets industry standards.
7.What is the process for return or replacement of LT8652SIV#PBF?
All LT8652SIV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8652SIV#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 LT8652SIV#PBF part is unused and in its original packaging.
Return procedure for LT8652SIV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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