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Analog Devices Inc. LT8650SIV#PBF
- Part No.:
- LT8650SIV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8650SIV#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A DL 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,041
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Product details
Overview
LT8650SIV#PBF from Analog Devices is a dual-channel synchronous step-down DC/DC regulator delivering up to 4A per channel continuously (6A peak), operating from 3.0V–42V input, featuring Silent Switcher®2 architecture for ultralow EMI, 6.2µA quiescent current in Burst Mode, and 40ns minimum on-time. It powers automotive infotainment and industrial control subsystems requiring tightly regulated 5V/4A and 3.3V/4A rails.
For engineers reviewing the LT8650SIV#PBF datasheet, LT8650SIV#PBF pinout, LT8650SIV#PBF application, or LT8650SIV#PBF equivalent, key selection criteria include dual-channel independent enable/control, external VC compensation for fast transient response, CLKOUT synchronization for multi-phase scaling, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LT8650SIV#PBF implements peak current mode control with integrated 0.8V reference and dual error amplifiers, each with dedicated VC pins enabling independent loop compensation or current sharing. Its second-generation Silent Switcher architecture embeds internal bypass capacitors on VIN1, VIN2, VCC, BST1, and BST2 to minimize high-frequency current loop area and eliminate layout sensitivity.
It supports three operating modes: Burst Mode (6.2µA IQ), forced continuous mode (fixed fSW), and spread-spectrum modulation (reducing EMI peaks). The SYNC pin accepts external clocks up to 3MHz or configures internal operation; CLKOUT provides phase-shifted output for 4-phase 16A supply stacking when synchronizing two ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery range (cold crank to load dump) without pre-regulation |
| Output Current (per channel) | 4A continuous, 6A peak - enables single-chip dual-rail power for SoC + peripheral subsystems |
| Quiescent Current (Burst Mode) | 6.2µA at 12VIN → 5V/3.3V - sustains >10-year battery life in always-on automotive modules |
| Switching Frequency Range | 300kHz to 3MHz - allows optimization of size (high fSW) vs. efficiency (low fSW) with RT resistor |
| Minimum On-Time | 40ns - enables 12V→1.2V conversion at 2MHz without pulse-skipping instability |
| Feedback Reference Voltage | 0.794V to 0.806V - tight 0.8V ±0.75% tolerance ensures accurate output regulation across temperature |
| Thermal Rating | –40°C to 125°C junction - qualified per AEC-Q100 Grade I for under-hood automotive use |
Pinout & Package
LT8650SIV#PBF uses a 32-pin LQFN package (6mm × 4mm × 0.94mm) with exposed thermal pad (pins 33–38) soldered to PCB ground for θJC = 4.92°C/W. Pin functions are validated per Analog Devices Rev. D datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pins 4,5) | Channel 1 input supply | Must be ≥3V; powers internal circuitry and top switch; requires local ceramic bypass |
| EN/UV1 (Pin 11) | Channel 1 enable & undervoltage lockout | Hysteresis: 0.74V↓ / 0.77V↑; ties to VIN1 if shutdown not needed |
| VC1 (Pin 27) | Channel 1 error amplifier output | Connect to RC network for external compensation; tie to VCC for internal compensation (2.5µA IQ) |
| CLKOUT (Pin 17) | Phase-sync clock output | 90° out-of-phase square wave in FCM; enables 4-phase 16A supply when cascading two LT8650SICs |
| TEMP (Pin 13) | Junction temperature monitor | 250mV @ 25°C, 9.5mV/°C slope; valid only in forced continuous mode across full load range |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 Architecture | Integrated bypass capacitors on VIN1/VIN2/VCC/BST1/BST2 reduce radiated EMI by >30dB vs. legacy layouts, eliminating EMI filter components |
| Dual Independent VC Pins | Enable per-channel loop compensation tuning or active current sharing between channels without external op-amps |
| CLKOUT Synchronization | Generates precise 90° phase-shifted clock for stacking two LT8650SICs into 4-phase 16A supply with interleaved ripple cancellation |
| AEC-Q100 Qualified | Grade I (–40°C to 125°C) qualification confirmed for automotive power systems including ADAS and body control modules |
| Ultralow IQ Burst Mode | 6.2µA total IQ regulating both 5V and 3.3V outputs enables >10-year battery backup in always-on telematics units |
Applications
| Automotive Infotainment | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering SoC core (5V) and interface peripherals (3.3V) in head-unit systems with 9–16V battery input and strict CISPR-25 Class 5 EMI limits. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing isolated, low-noise 5V/4A and 3.3V/4A rails with synchronized switching to suppress beat frequencies. Use Value: Silent Switcher®2 eliminates need for external EMI filters, reducing BOM cost and PCB area by >25% while meeting automotive EMC requirements. |
Use Scenario: Generating stable 5V and 3.3V supplies for microcontroller, analog front-end, and communication ICs in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency dual buck converter supporting wide 9–42V industrial input range and operating reliably at 85°C ambient. Use Value: 40ns min on-time enables direct 24V→3.3V conversion at 2MHz, shrinking inductor size by 40% vs. 500kHz solutions. |
| Medical Diagnostic Imaging | Test & Measurement Equipment |
Use Scenario: Supplying low-noise bias rails for ADCs, DACs, and sensor interfaces in portable ultrasound devices powered by Li-ion batteries (3.0–4.2V). IC Role / Device Role / Timing Role: Dual buck regulator operating down to 3.0V input with Burst Mode to extend battery runtime during standby. Use Value: 6.2µA quiescent current extends 2000mAh battery life to >10 years in sleep mode, critical for field-deployed diagnostic tools. |
Use Scenario: Providing precision 5V and 3.3V rails for FPGA configuration, high-speed serial transceivers, and analog signal chains in benchtop oscilloscopes. IC Role / Device Role / Timing Role: Dual-channel regulator with external VC compensation enabling <10µs transient response to FPGA dynamic load steps. Use Value: External VC pins allow custom loop shaping to maintain <±1% output deviation during 0→4A load transients at 2MHz switching. |
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 |
|---|---|---|---|
| LT8640SIV#PBF | Single-channel 4A buck; same package, Silent Switcher®2, 6.2µA IQ, but no dual output or CLKOUT sync | Requires two ICs for dual-rail designs; lacks current sharing and 4-phase scalability | Select when only one regulated rail is needed or space allows discrete dual implementation |
| MPQ4423AGL-AEC1-Z | Automotive dual 3A buck (36V max); no integrated bypass caps, higher 25µA IQ, no CLKOUT or VC pins | Lacks Silent Switcher®2 EMI performance and advanced sync features; limited transient response tuning | Select for cost-sensitive automotive applications where EMI filtering is acceptable and 4A/channel not required |
Compared with LT8640SIV#PBF and MPQ4423AGL-AEC1-Z, the LT8650SIV#PBF uniquely delivers dual 4A outputs with integrated EMI mitigation, per-channel loop control via VC pins, and CLKOUT-based multi-phase scalability-enabling compact, high-reliability power architectures unachievable with single-channel or non-Silent Switcher alternatives.
Availability
LT8650SIV#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial PLCs, and medical imaging systems requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LT8650SIV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LT8650SIV#PBF belongs to the Silent Switcher®2 power management product line, engineered specifically for noise-sensitive automotive and industrial applications demanding ultralow EMI, high efficiency at high frequency, and robust thermal performance.
FAQ
What is the maximum output current capability of the LT8650SIV#PBF per channel?
The LT8650SIV#PBF delivers up to 4A of continuous output current from each channel under typical thermal conditions (θJA = 16.18°C/W, 2-layer PCB). It supports peak loads up to 6A per channel for short durations, verified in the datasheet's "Top Power NMOS Current Limit" specification (10–14A min/max) and thermal rise curves (G42/G43). Derating is required above 85°C ambient.
Does the LT8650SIV#PBF require external compensation components?
The LT8650SIV#PBF supports both internal and external compensation. Connecting VC1/VC2 to VCC enables internal compensation with 2.5µA per-channel IQ in Burst Mode. For optimized transient response or current sharing, external RC networks must be connected to VC1/VC2 - increasing IQ to ~50µA per channel but enabling precise loop shaping per the datasheet's Type II/III compensation guidelines.
How does the LT8650SIV#PBF achieve ultralow EMI performance?
The LT8650SIV#PBF achieves ultralow EMI through Silent Switcher®2 architecture: integrated ceramic bypass capacitors on VIN1, VIN2, VCC, BST1, and BST2 minimize high-frequency current loop area; symmetrical pinout and flip-chip packaging reduce magnetic field coupling; and optional spread-spectrum modulation further lowers peak emissions. Radiated EMI test data (G44/G45) confirms compliance with CISPR-25 Class 5 limits without external filters.
Can the LT8650SIV#PBF synchronize with an external clock source?
Yes - the LT8650SIV#PBF's SYNC pin accepts external clock signals from 300kHz to 3MHz. When driven, the device operates in forced continuous mode and its CLKOUT pin mirrors the input clock's phase, duty cycle, and frequency. This enables precise timing alignment across multiple regulators in high-density power systems, such as multi-phase CPU/GPU VRMs.
Is the LT8650SIV#PBF qualified for automotive applications?
Yes - the LT8650SIV#PBF is AEC-Q100 qualified for Grade I (–40°C to +125°C junction temperature) and manufactured under automotive quality controls. Its datasheet specifies guaranteed operation across this range, includes automotive reliability reports, and supports automotive-specific features like EN/UV hysteresis, TEMP monitoring, and fault-flagged PG outputs - all validated per JESD47 and AEC stress tests.
LT8650SIV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 32-TFQFN Exposed Pad, 28 Leads
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 4A
- Frequency - Switching:
- 300kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFN (6x4)
LT8650SIV#PBF FAQ
1.How can I place an order for LT8650SIV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8650SIV#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 LT8650SIV#PBF reliable?
The price and inventory of LT8650SIV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8650SIV#PBF is usually 5 days.
3.What payment methods are accepted for LT8650SIV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8650SIV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8650SIV#PBF?
LT8650SIV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8650SIV#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 LT8650SIV#PBF?
For technical support, including LT8650SIV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8650SIV#PBF requirements.
6.How does Aetrix verify that LT8650SIV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8650SIV#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 LT8650SIV#PBF meets industry standards.
7.What is the process for return or replacement of LT8650SIV#PBF?
All LT8650SIV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8650SIV#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 LT8650SIV#PBF part is unused and in its original packaging.
Return procedure for LT8650SIV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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