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Analog Devices Inc. LT8650SIV#TRPBF
- Part No.:
- LT8650SIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8650SIV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A DL 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
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Product details
Overview
LT8650SIV#TRPBF from Analog Devices is a dual-channel synchronous step-down DC/DC regulator delivering up to 4A continuously per channel (6A peak), operating from 3.0V–42V input, with 6.2µA quiescent current in Burst Mode and integrated Silent Switcher®2 architecture for ultralow EMI. It powers automotive infotainment SoCs requiring tightly regulated 5V/4A and 3.3V/4A rails at 2MHz switching frequency.
For engineers reviewing the LT8650SIV#TRPBF datasheet, LT8650SIV#TRPBF pinout, LT8650SIV#TRPBF application, or LT8650SIV#TRPBF equivalent, key selection criteria include dual-channel 42V input capability, AEC-Q100 qualification, 40ns minimum on-time for high step-down ratios, internal bypass capacitors eliminating layout sensitivity, and CLKOUT-enabled 4-phase synchronization for 16A systems.
Technical Context
The LT8650SIV#TRPBF implements peak current mode control with independent VC pins enabling external loop compensation for fast transient response and precise current sharing between channels. Its second-generation Silent Switcher architecture integrates ceramic bypass capacitors on-chip for VIN1, VIN2, VCC, BST1, and BST2, minimizing high-frequency current loop area and radiated EMI without requiring special PCB layout.
It supports three operating modes: Burst Mode (6.2µA IQ), forced continuous mode (fixed fSW), and spread spectrum modulation-each selectable via SYNC pin voltage or external clock injection. The device features independent enable/UVLO pins (EN/UV1, EN/UV2), power-good outputs (PG1, PG2), and temperature monitoring (TEMP) with 9.5mV/°C slope, all validated across –40°C to 125°C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients (cold crank, load dump) without external protection. |
| Output Current per Channel | 4A continuous, 6A peak - enables single-package dual-rail supply for FPGA/SoC core and I/O domains. |
| Quiescent Current | 6.2µA in Burst Mode - sustains >10-year battery life in always-on automotive modules (e.g., telematics, ADAS sensors). |
| Switching Frequency | 300kHz to 3MHz (RT-programmable) - allows 2MHz operation for compact 1µH inductors and minimal output capacitance. |
| Minimum On-Time | 40ns - achieves 5V-out from 42V-in at 2MHz (12:1 step-down) without pulse-skipping instability. |
| Feedback Reference | 0.794V to 0.806V - tight 0.8V ±0.75% tolerance ensures <±1% output regulation accuracy over temp and line. |
| Thermal Rating | –40°C to 125°C junction (I-grade) - qualified for under-hood automotive applications per AEC-Q100 Rev H. |
Pinout & Package
LT8650SIV#TRPBF uses a 32-pin LQFN package (6mm × 4mm × 0.94mm) with exposed thermal pad (pins 33–38 = GND). The package is RoHS-compliant, lead-free, and MSL Level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pins 4,5) | Channel 1 Input Supply | Must be ≥3V; powers internal circuitry and CH1 top switch; requires local 4.7µF ceramic bypass. |
| VIN2 (Pins 7,8) | Channel 2 Input Supply | Independent input rail (3.7V–42V); CH2 requires VIN1 present but can differ in voltage/sourcing. |
| EN/UV1 (Pin 11), EN/UV2 (Pin 12) | Channel Enable / UVLO Inputs | Hysteretic threshold (0.74V↓/0.77V↑); enables programmable undervoltage lockout for each rail. |
| PG1 (Pin 14), PG2 (Pin 15) | Power-Good Open-Drain Outputs | Assert high when FBx is within ±7.5% of target; pulled low during UVLO, thermal shutdown, or disable. |
| VC1 (Pin 27), VC2 (Pin 32) | Error Amplifier Compensation Outputs | Enable external Type II/III compensation for optimized transient response or current sharing between ICs. |
| CLKOUT (Pin 17) | Phase-Shifted Clock Output | 90° out-of-phase 50% duty square wave in FCM; enables 4-phase interleaving with two LT8650S devices for 16A. |
| TEMP (Pin 13) | Junction Temperature Monitor | 250mV @ 25°C +9.5mV/°C; valid only in FCM-used for system thermal derating or fault logging. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 Architecture | On-die VIN/VCC/BST bypass caps eliminate layout-dependent EMI; meets CISPR 25 Class 5 limits without shielding. |
| Dual Independent Channels | Each channel supports full 4A/42V operation with separate EN, PG, SS, and VC pins-enables asymmetric rail sequencing. |
| Ultra-Low IQ Burst Mode | 6.2µA total IQ regulating both 5V and 3.3V outputs-critical for always-on automotive subsystems with µA-level standby budgets. |
| 4-Phase Synchronization Capability | CLKOUT + SYNC pins allow two LT8650S units to generate interleaved 4-phase 16A supply with <5mV ripple at 8MHz effective frequency. |
| AEC-Q100 Grade I Qualification | Validated for –40°C to +125°C operation with HTOL, TC, UHAST, and ESD testing-suitable for front-end ADAS camera modules. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC-based head unit with 5V core logic and 3.3V interface peripherals. IC Role / Device Role / Timing Role: Primary dual-output buck regulator providing sequenced, monitored, and EMI-compliant power rails. Use Value: Eliminates need for discrete EMI filters and secondary regulators; reduces BOM count by 3+ components versus discrete solutions. |
Use Scenario: Compact DIN-rail mounted PLC with isolated field I/O requiring stable 5V and 3.3V supplies from 24VDC industrial bus. IC Role / Device Role / Timing Role: High-efficiency dual-buck controller managing load transients from solenoid actuation and sensor sampling. Use Value: 94.6% efficiency at 2A/5V enables convection-only cooling in sealed enclosures; 40ns min-on-time supports brownout operation down to 18V input. |
| ADAS Camera Module | Medical Imaging Sensor Interface |
Use Scenario: Powering image sensor, ISP, and SerDes in rear-view camera with strict CISPR 25 radiated emission limits. IC Role / Device Role / Timing Role: EMI-optimized dual-channel regulator with spread spectrum and internal bypass caps for zero-layout sensitivity. Use Value: Passes Class 5 radiated emissions at 100MHz–1GHz without ferrite beads or metal shields-reducing mechanical complexity and cost. |
Use Scenario: Low-noise power for high-resolution CMOS image sensor array requiring ultra-stable 3.3V analog and 5V digital rails. IC Role / Device Role / Timing Role: Dual synchronous buck with <10mVP-P ripple and fast transient response (<50µs recovery from 2A step load). Use Value: Enables sub-1LSB noise floor in 16-bit ADC readouts; soft-start tracking (SS1/SS2) prevents sensor reset during power-up. |
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 | 42V input, 4A/channel, but no integrated Silent Switcher; requires external EMI filtering; 12µA IQ in skip mode. | Lacks CLKOUT and VC pins-no multi-phase sync or precision current sharing; lower EMI performance mandates layout tuning. | Select when cost sensitivity outweighs EMI certification risk and multi-phase scalability is unnecessary. |
| TPS6521905RGER | 2.7V–20V input, 3A/channel, integrated LDOs, but not AEC-Q100 qualified; 15µA IQ in LP mode. | Lower voltage rating excludes 24V/42V automotive systems; lacks TEMP pin and spread spectrum-unsuitable for under-hood use. | Select for consumer-grade portable electronics where input range ≤20V and qualification is not required. |
Compared with MPQ8645PGLE-AEC1-Z and TPS6521905RGER, the LT8650SIV#TRPBF uniquely combines AEC-Q100 Grade I qualification, on-die EMI suppression, 42V operation, and hardware-supported 4-phase scaling-making it the only choice for scalable, certified, high-density automotive power designs.
Availability
LT8650SIV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial PLC I/O requiring stable component supply with guaranteed long-term availability and AEC-Q100 compliance.
Supply support for LT8650SIV#TRPBF 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 with robust, reliable, and application-optimized ICs.
The LT8650SIV#TRPBF belongs to Analog Devices' Silent Switcher®2 power management product line, engineered specifically for automotive and industrial applications demanding ultralow EMI, high efficiency at high frequencies, and extended temperature reliability without layout compromises.
FAQ
What is the maximum junction temperature rating for the LT8650SIV#TRPBF?
The LT8650SIV#TRPBF is rated for operation from –40°C to +125°C junction temperature and is AEC-Q100 Grade I qualified. Its thermal resistance (θJA = 16.18°C/W) and exposed pad design enable reliable operation in automotive under-hood environments when properly mounted to a 4-layer PCB with thermal vias. The LT8650SIV#TRPBF includes overtemperature protection that activates above 150°C.
Does the LT8650SIV#TRPBF support synchronization between two devices for higher current output?
Yes, the LT8650SIV#TRPBF supports 4-phase interleaving via its CLKOUT and SYNC pins. When two LT8650SIV#TRPBF units are configured-one as master (CLKOUT floating) and one as slave (SYNC tied to master's CLKOUT)-they generate phase-shifted switching waveforms enabling a combined 16A output with reduced input/output ripple and improved thermal distribution. This is explicitly documented in the LT8650S datasheet Figure 1 and Applications section.
How does the LT8650SIV#TRPBF achieve ultralow EMI without external filtering?
The LT8650SIV#TRPBF integrates ceramic bypass capacitors directly into the package for VIN1, VIN2, VCC, BST1, and BST2-minimizing high-frequency current loop area and eliminating PCB layout sensitivity. Combined with symmetrical pinout, balanced internal power paths, and optional spread spectrum modulation, this Silent Switcher®2 architecture enables compliance with CISPR 25 Class 5 radiated emissions limits using only standard 4-layer PCBs and no external EMI filters or metal shielding.
Can the LT8650SIV#TRPBF operate with different input voltages on VIN1 and VIN2?
Yes, the LT8650SIV#TRPBF supports independent input supplies: VIN1 (3.0V–42V) powers internal circuitry and CH1, while VIN2 (3.7V–42V) powers CH2. However, VIN1 must be present and ≥3V for CH2 to function-even if VIN2 is active. This allows flexible power tree design, such as using a pre-regulated 5V rail for VIN1 and a raw 24V bus for VIN2 in industrial systems.
What is the purpose of the TEMP pin on the LT8650SIV#TRPBF, and how is it used?
Pin 13 (TEMP) provides a voltage proportional to junction temperature (250mV at 25°C, +9.5mV/°C), but its output is only valid in Forced Continuous Mode-not Burst Mode-due to light-load inaccuracies. It is used for system-level thermal monitoring, derating, or fault logging in automotive and industrial applications. The LT8650SIV#TRPBF datasheet specifies that TEMP must be read with both channels in FCM and recommends external ADC sampling for closed-loop thermal management.
LT8650SIV#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 32-TFQFN Exposed Pad, 28 Leads
- Packaging:
- Tape & Reel (TR)
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFN (6x4)
LT8650SIV#TRPBF FAQ
1.How can I place an order for LT8650SIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8650SIV#TRPBF 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#TRPBF reliable?
The price and inventory of LT8650SIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8650SIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8650SIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8650SIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8650SIV#TRPBF?
LT8650SIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8650SIV#TRPBF 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#TRPBF?
For technical support, including LT8650SIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8650SIV#TRPBF requirements.
6.How does Aetrix verify that LT8650SIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8650SIV#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8650SIV#TRPBF?
All LT8650SIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8650SIV#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT8650SIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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