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Analog Devices Inc. LT8652SEV#PBF
- Part No.:
- LT8652SEV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 36-TFQFN Exposed Pad
- Datasheet:
-
LT8652SEV#PBF.pdf
- Description:
- IC REG BUCK 0.6V DL 36LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:956
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Product details
Overview
LT8652SEV#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, 300kHz–3MHz adjustable switching frequency, and ±1.2% feedback reference accuracy. It serves as a high-density, low-EMI power supply core for FPGA, ASIC, and multi-rail server subsystems.
For engineers reviewing the LT8652SEV#PBF datasheet, LT8652SEV#PBF pinout, LT8652SEV#PBF application, or LT8652SEV#PBF equivalent, key selection considerations include dual-channel current monitoring (IMON1/IMON2), differential remote sensing (SNSGND1/SNSGND2), CLKOUT phase synchronization, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT8652SEV#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 control loops support forced continuous mode (FCM) or ultralow-IQ Burst Mode operation per channel.
Each channel features internal top/bottom NMOS switches (RDS(ON) = 24mΩ/8mΩ), 20ns minimum on-time, and programmable current limiting via IMON pins. The device supports output voltage tracking, soft-start, and thermal monitoring via TEMP pin - all operating across –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8.5A per channel continuous; up to 12A per channel peak - enables single-chip dual-rail supply for high-performance processors. |
| Quiescent Current | 16µA at 12VIN→3.3VOUT (both channels) - sustains battery-backed systems >1000 hours in standby. |
| Switching Frequency | 300kHz–3MHz (RT-programmable) - allows optimization of size vs. efficiency across 0.2µH–1.2µH inductors. |
| Feedback Accuracy | ±1.2% at 600mV reference - ensures tight regulation under load transients and line variation. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - eliminates need for external EMI filters in automotive infotainment. |
| Package | 36-pin LQFN (4mm × 7mm × 0.94mm) with exposed GND pad - provides θJCbot = 4.2°C/W for high-power thermal management. |
| Operating Temp | –40°C to +125°C junction - qualified per AEC-Q100 Grade 1 for under-hood automotive applications. |
Pinout & Package
LT8652SEV#PBF uses a 36-pin LQFN package (4mm × 7mm, 0.94mm height) with six exposed GND pads (pins 37–42) requiring solder connection to PCB ground plane for thermal and EMI performance. Pin functions are validated per Analog Devices' LT8652S Rev. B datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IMON1 (1) | Channel 1 current monitor output | Current source proportional to average IOUT1; sets current limit via RIMON = 78kΩ/ILIM. |
| SS2 (2) | Channel 2 soft-start/tracking input | Voltage below 0.6V forces FB2 to track SS2; internal 2µA pull-up enables capacitor-based slew rate control. |
| RT (3) | Frequency programming input | Resistor to GND sets fSW: 300kHz (143kΩ) to 3MHz (20kΩ). |
| VIN1 (5–7) | Channel 1 input power supply | Supplies internal circuitry and top FET; must be ≥3.0V and locally bypassed. |
| EN/UV (13) | Enable/undervoltage lockout input | Hysteresis: 0.80V (falling), 0.82V (rising); ties to VIN1 for always-on operation. |
| PG1 (16) | Channel 1 power-good open-drain | Asserts high when FB1 is within ±7% of target and no fault (UVLO, thermal, EN low). |
| CLKOUT (18) | Phase-sync clock output | 90° out-of-phase square wave in FCM; enables 4-phase interleaving with other regulators. |
| BST1 (26) | Channel 1 bootstrap supply | Drives top FET gate above VIN1; requires 0.1µF ceramic capacitor to SW1. |
| BIAS (27) | Internal regulator auxiliary supply | Reduces IQ when tied to VOUT ≥3.1V (e.g., 3.3V rail); improves efficiency at light loads. |
| VC1 (31) | Channel 1 error amplifier output | Compensation node; connect to VCC for internal compensation (12.8µA IQ) or external network for custom loop response. |
| FB1 (32) | Channel 1 feedback input | Regulated to 600mV ±1.2% referenced to SNSGND1; enables precise point-of-load regulation. |
| SNSGND1 (33) | Channel 1 Kelvin sense ground | Provides dedicated return path for feedback divider - eliminates IR drop error in high-current paths. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 architecture | Integrated bypass capacitors + spread spectrum reduce radiated EMI by >30dB vs. conventional buck ICs - passes CISPR 25 Class 5 without shielding. |
| Dual-channel current monitoring | Independent IMON1/IMON2 pins provide real-time average current readback and programmable per-channel current limiting - simplifies overcurrent protection design. |
| Differential remote sensing | SNSGND1/SNSGND2 pins enable true Kelvin connection to output capacitors - maintains ±1.2% regulation accuracy even with 100mΩ PCB trace resistance. |
| Four-phase clock synchronization | CLKOUT pin outputs 90° phase-shifted clock in FCM; two LT8652SEV#PBF devices can interleave into 4-phase 34A supply - reduces output ripple by 75%. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation with full electrical characterization - suitable for automotive ADAS camera modules and infotainment head units. |
Applications
| Automotive ADAS Camera Power | Server CPU Core Voltage |
|---|---|
Use Scenario: Dual-rail power for image sensor (1.2V) and ISP SoC (0.85V) in rear-view camera module. IC Role / Device Role / Timing Role: Primary dual-output DC/DC regulator providing tightly regulated, low-noise supplies with synchronized switching to avoid beat frequencies. Use Value: 16µA IQ extends parking-mode battery life; CISPR 25 compliance eliminates EMI filter cost; AEC-Q100 ensures field reliability. | Use Scenario: High-current core voltage supply for x86 server CPU requiring fast transient response and precise voltage tracking. IC Role / Device Role / Timing Role: Dual-channel buck controller delivering 3.3V I/O and 0.85V core rails with independent soft-start and PG signaling. Use Value: 20ns min on-time enables 0.85V@12A at 2MHz; differential sensing maintains <±5mV load regulation; CLKOUT enables multi-phase scaling. |
| FPGA I/O and Core Rail Supply | Industrial PLC Processing Unit |
Use Scenario: Powering Xilinx Kintex UltraScale+ FPGA with separate 1.2V core and 3.3V I/O supplies in industrial control system. IC Role / Device Role / Timing Role: Single-package dual-buck solution replacing two discrete regulators - reducing board area by 40%. Use Value: 8.5A/channel capability supports FPGA dynamic power bursts; IMON pins feed FPGA thermal management logic; TEMP pin enables junction temperature monitoring. | Use Scenario: Main 5V and 3.3V power rails for ARM-based PLC controller operating in harsh factory environments. IC Role / Device Role / Timing Role: Industrial-grade dual-output regulator with extended temperature range and robust fault reporting (PG1/PG2). Use Value: –40°C to +125°C operation ensures reliability in uncooled enclosures; UVLO and thermal shutdown prevent field failures; exposed pad enhances thermal derating. |
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 |
|---|---|---|---|
| MPQ8645PGLE-AEC1-Z | Single-channel 12A, 3.3–18V input, 500kHz–2.2MHz fSW, 25µA IQ, QFN-24 | No dual-channel integration; requires two ICs for same functionality | Select when needing higher per-channel current (12A) but accepting larger footprint and no inter-channel synchronization. |
| TPS546D24RSAR | Single-channel 60A digital multiphase controller, supports PMBus, 40µA IQ, 32-pin VQFN | Requires external power stages; no integrated MOSFETs; digital control adds complexity | Select for ultra-high-current (>20A) applications requiring telemetry, margining, and dynamic voltage scaling via PMBus. |
Compared with MPQ8645PGLE-AEC1-Z and TPS546D24RSAR, the LT8652SEV#PBF uniquely integrates dual 8.5A channels with Silent Switcher EMI suppression, CLKOUT phase sync, and AEC-Q100 qualification - enabling compact, automotive-compliant, multi-rail power in a single 4mm×7mm package.
Availability
LT8652SEV#PBF is available at Aetrix Electronics and suitable for automotive ADAS, server CPU power, and industrial PLC applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LT8652SEV#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 LT8652S product line delivers dual-channel, high-current, low-EMI synchronous buck regulators targeting noise-sensitive applications including automotive radar, FPGA/ASIC power, and high-bandwidth data converters where clean, compact, and reliable power conversion is critical.
FAQ
What is the maximum continuous output current per channel for the LT8652SEV#PBF?
The LT8652SEV#PBF delivers up to 8.5A of continuous output current from each channel under typical thermal conditions (θJA = 18°C/W, 2-layer PCB). With optimized layout and heatsinking, it supports up to 12A per channel in short-duration peak loads. Both channels can operate simultaneously at 8.5A, enabling a total 17A dual-rail solution without external current sharing circuitry.
Does the LT8652SEV#PBF support synchronization to an external clock source?
Yes, the LT8652SEV#PBF supports external clock synchronization via its SYNC pin (Pin 17). Applying a TTL- or CMOS-compatible clock signal to SYNC forces the device into forced continuous mode and locks its switching frequency and phase to the external source. The CLKOUT pin (Pin 18) then outputs a waveform matching the SYNC input's frequency, duty cycle, and phase - enabling precise multi-phase interleaving with other regulators.
How does the LT8652SEV#PBF achieve ultralow EMI performance without external filters?
The LT8652SEV#PBF achieves ultralow EMI through second-generation Silent Switcher®2 architecture: integrated input bypass capacitors minimize high-di/dt loop area, symmetrical pinout cancels magnetic fields, and spread-spectrum frequency modulation disperses energy across a 100kHz bandwidth. These features allow the LT8652SEV#PBF to meet CISPR 25 Class 5 radiated emission limits on standard 4-layer PCBs - eliminating the need for ferrite beads or metal shielding in most automotive designs.
Can the LT8652SEV#PBF be used in forced continuous mode (FCM) and Burst Mode simultaneously on different channels?
No - the LT8652SEV#PBF operates in either Forced Continuous Mode (FCM) or Burst Mode globally, controlled by the SYNC pin state. When SYNC is floated or driven high (>2.8V), FCM is active on both channels. When SYNC is grounded, Burst Mode activates on both channels. There is no provision for independent mode selection per channel; however, each channel retains independent soft-start, current limit, and PG signaling.
What is the function of the SNSGND1 and SNSGND2 pins on the LT8652SEV#PBF?
The SNSGND1 and SNSGND2 pins serve as dedicated Kelvin sense returns for the FB1 and FB2 feedback networks, respectively. By routing the output capacitor ground directly to these pins - separate from the main power ground - the LT8652SEV#PBF eliminates voltage drop errors caused by PCB trace resistance. This ensures the feedback loop regulates precisely to 600mV ±1.2% at the load, maintaining tight output accuracy even at 8.5A with >100mΩ parasitic resistance in high-current paths.
LT8652SEV#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)
LT8652SEV#PBF FAQ
1.How can I place an order for LT8652SEV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8652SEV#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 LT8652SEV#PBF reliable?
The price and inventory of LT8652SEV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8652SEV#PBF is usually 5 days.
3.What payment methods are accepted for LT8652SEV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8652SEV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8652SEV#PBF?
LT8652SEV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8652SEV#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 LT8652SEV#PBF?
For technical support, including LT8652SEV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8652SEV#PBF requirements.
6.How does Aetrix verify that LT8652SEV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8652SEV#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 LT8652SEV#PBF meets industry standards.
7.What is the process for return or replacement of LT8652SEV#PBF?
All LT8652SEV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8652SEV#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 LT8652SEV#PBF part is unused and in its original packaging.
Return procedure for LT8652SEV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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