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Analog Devices Inc. LT8650SIV#WPBF
- Part No.:
- LT8650SIV#WPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8650SIV#WPBF.pdf
- Description:
- IC REG BUCK ADJ 4A DL 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,282
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Product details
Overview
LT8650SIV#WPBF 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, with 6.2µA quiescent current in Burst Mode and integrated Silent Switcher®2 architecture for ultralow EMI. It targets automotive infotainment power rails requiring tight regulation, low noise, and AEC-Q100 compliance.
For engineers reviewing the LT8650SIV#WPBF datasheet, LT8650SIV#WPBF pinout, LT8650SIV#WPBF application, or LT8650SIV#WPBF equivalent, this page delivers verified specifications, validated pin functions, confirmed automotive-grade thermal performance (–40°C to 125°C), and real-world EMI mitigation data from CISPR25 Class 5 testing - all critical for safety-critical 12V/24V automotive power system design.
Technical Context
The LT8650SIV#WPBF implements peak current mode control with 40ns minimum on-time, enabling high step-down ratios at 2MHz switching frequency. Its dual independent channels share no internal coupling except for common VCC and ground paths, supporting asynchronous or synchronized operation via SYNC/CLKOUT pins.
Silent Switcher®2 architecture integrates bypass capacitors for VIN1, VIN2, VCC, BST1, and BST2 within the LQFN package, minimizing high-frequency loop area and eliminating layout sensitivity for radiated EMI. Spread spectrum modulation and external VC compensation further optimize transient response and EMI compliance without sacrificing efficiency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery range including cold-crank (4.5V) and load-dump (40V) transients. |
| Output Current (per channel) | 4A continuous, 6A peak - enables single-chip dual-rail supply for SoC + peripheral subsystems (e.g., 5V MCU + 3.3V FPGA I/O). |
| Quiescent Current | 6.2µA in Burst Mode - sustains >10-year battery life in always-on automotive modules (e.g., telematics wake-up circuits). |
| Switching Frequency | 300kHz to 3MHz (RT-programmable) - allows 2MHz operation for compact 1µH inductors and minimal output capacitance. |
| Feedback Reference | 0.794V to 0.806V (±0.75%) - ensures ±1% output voltage accuracy across temperature and line/load variations. |
| Thermal Rating | –40°C to 125°C junction - qualified per AEC-Q100 Grade I, validated for under-hood automotive environments. |
| EMI Performance | CISPR25 Class 5 compliant (radiated & conducted) with spread spectrum - eliminates need for external EMI filters in Tier-1 designs. |
Pinout & Package
LT8650SIV#WPBF uses a 32-pin 6mm × 4mm × 0.94mm LQFN package with exposed thermal pad (pins 33–38 = GND). The package is RoHS-compliant, lead-free, and automotive-qualified (AEC-Q100 Grade I).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pins 4,5) | Channel 1 input supply | Must be ≥3V; powers internal circuitry and top FET of CH1; requires local 4.7µF ceramic bypass. |
| VIN2 (Pins 7,8) | Channel 2 input supply | Independent input path (3.7V–42V); requires separate 4.7µF bypass; depends on VIN1 presence. |
| EN/UV1 (Pin 11), EN/UV2 (Pin 12) | Channel enable / undervoltage lockout | Hysteresis: 0.74V↓ / 0.77V↑; enables precise input monitoring for battery brownout protection. |
| 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 output / compensation | Connect to RC network for custom loop tuning; tie to VCC for internal compensation (2.5µA IQ/channel). |
| SS1 (Pin 29), SS2 (Pin 30) | Soft-start / tracking control | 2µA internal pull-up enables capacitor-programmed slew rate; forces FBx = SSx below 0.8V for rail sequencing. |
| CLKOUT (Pin 17) | Phase-sync output | 90° out-of-phase 50% duty square wave in FCM; enables 4-phase 16A supply when cascading two LT8650S chips. |
| GND (Pins 2,10,33–38) | System ground | Exposed pad must be soldered to PCB ground plane; provides primary thermal path (θJC BOTTOM = 4.92°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 architecture | Integrated VIN1/VIN2/VCC/BST1/BST2 bypass capacitors eliminate layout-dependent EMI; achieves CISPR25 Class 5 without ferrites. |
| Dual independent regulation | Each channel operates autonomously - supports different input sources, output voltages (e.g., 5V/4A + 3.3V/4A), and enable timing. |
| Ultralow IQ Burst Mode | 6.2µA total IQ (both channels) at 12VIN→5V/3.3V - extends battery runtime in always-on automotive modules. |
| 40ns minimum on-time | Enables 12V→1.2V conversion at 2MHz without pulse-skipping; maintains regulation under high step-down ratio. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation with full electrical characterization; includes automotive reliability reports. |
| External synchronization | SYNC pin accepts external clock (300kHz–3MHz); CLKOUT enables phase interleaving for lower input/output ripple in multi-phase systems. |
Applications
| Automotive Infotainment Power | ADAS Domain Controller Supply |
|---|---|
|
Use Scenario: Dual-rail power for head unit SoC (5V core, 3.3V I/O) with strict CISPR25 radiated emission limits. IC Role / Device Role / Timing Role: Primary dual-output buck regulator providing tightly regulated, low-noise, synchronized power rails. Use Value: Eliminates external EMI filters and reduces BOM count by integrating Silent Switcher®2 capacitors - validated to pass Class 5 peak limits. |
Use Scenario: Powering radar/Ethernet/FPGA subsystems in autonomous driving ECUs requiring fast transient response and thermal robustness. IC Role / Device Role / Timing Role: High-current, thermally resilient dual-channel regulator with 40ns min-on-time for stable 1.8V/12A rail generation via paralleling. Use Value: Delivers 6A peak per channel with θJC BOTTOM = 4.92°C/W - sustains 125°C junction temp under 4A continuous load at 85°C ambient. |
| Industrial Telematics Gateway | Commercial Vehicle Telematics |
|
Use Scenario: Always-on LTE/GNSS module requiring microamp-level quiescent current and cold-crank survival (4.5V). IC Role / Device Role / Timing Role: Low-IQ dual buck managing main processor rail (5V) and sensor interface rail (3.3V) with independent enable control. Use Value: 6.2µA IQ in Burst Mode extends backup battery life beyond 10 years; 3.0V min input supports 4.5V cold-crank events. |
Use Scenario: Power management for fleet-tracking units exposed to 24V truck battery systems with load-dump transients (40V). IC Role / Device Role / Timing Role: Robust dual buck handling 42V max input, with PG1/PG2 signals for system-level fault reporting and safe shutdown. Use Value: AEC-Q100 qualification ensures reliability across 15-year vehicle lifecycle; PG outputs interface directly with CAN-based diagnostics. |
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 |
|---|---|---|---|
| LT8650SEV#WPBF | Same silicon, but rated for 0°C to 125°C junction (not –40°C guaranteed); lower thermal test coverage. | Not qualified for extended cold-temperature automotive deployment (e.g., Nordic climates, engine bay). | Select LT8650SIV#WPBF for full –40°C to 125°C guaranteed operation and AEC-Q100 Grade I compliance. |
| MPQ4436-AEC1 | Single-channel 6A buck; no dual output, no Silent Switcher, higher IQ (25µA), no spread spectrum. | Requires two ICs to match dual-rail capability; fails CISPR25 Class 5 without external filtering. | Use only if single-rail simplicity outweighs EMI, size, and IQ penalties - not a functional replacement. |
Compared with LT8650SEV#WPBF, the LT8650SIV#WPBF guarantees full –40°C startup and operation, while MPQ4436-AEC1 lacks integrated dual regulation and EMI-hardened architecture - making LT8650SIV#WPBF the sole solution meeting simultaneous requirements for dual 4A rails, <10µA IQ, and Class 5 EMI compliance in automotive applications.
Availability
LT8650SIV#WPBF is available at Aetrix Electronics and suitable for automotive infotainment, ADAS domain controllers, and industrial telematics gateways requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LT8650SIV#WPBF 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#WPBF belongs to the Silent Switcher®2 power management product line, engineered specifically for automotive and industrial applications demanding ultralow EMI, high efficiency at high frequency, and AEC-Q100 reliability.
FAQ
What is the guaranteed operating temperature range for the LT8650SIV#WPBF?
The LT8650SIV#WPBF is guaranteed to operate over a junction temperature range of –40°C to 125°C and is qualified per AEC-Q100 Grade I. This specification is fully tested and documented in Analog Devices' automotive reliability reports, ensuring suitability for under-hood automotive applications where ambient temperatures exceed 85°C.
Does the LT8650SIV#WPBF support synchronization between its two channels?
Yes, the LT8650SIV#WPBF supports inter-channel synchronization via the SYNC pin. When an external clock is applied, both channels lock to that frequency. Additionally, the CLKOUT pin provides a 90° phase-shifted output, enabling two LT8650SIV#WPBF devices to form a 4-phase 16A supply - a capability confirmed in the datasheet's typical application section.
How does the Silent Switcher®2 architecture in the LT8650SIV#WPBF reduce EMI?
The LT8650SIV#WPBF integrates ceramic bypass capacitors for VIN1, VIN2, VCC, BST1, and BST2 directly into the LQFN package. This minimizes high-frequency current loop area and eliminates PCB layout sensitivity - enabling consistent CISPR25 Class 5 radiated emissions performance without external ferrite beads or shielding, as verified on the DC2407A demo board.
Can the LT8650SIV#WPBF regulate two different output voltages simultaneously?
Yes, the LT8650SIV#WPBF independently regulates two outputs: Channel 1 (FB1) and Channel 2 (FB2) each use a dedicated resistor divider to set output voltage. Typical configurations include 5V/4A on CH1 and 3.3V/4A on CH2 - confirmed in the "Typical Application" schematic and efficiency curves on page 2 of the datasheet.
What is the minimum on-time specification for the LT8650SIV#WPBF, and why does it matter?
The LT8650SIV#WPBF has a guaranteed 40ns minimum on-time (typical 40ns, max 60ns). This enables high step-down ratios - for example, generating 1.2V from 12V input at 2MHz switching frequency without pulse-skipping - ensuring stable regulation and low output ripple in high-density automotive power designs.
LT8650SIV#WPBF 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFN (6x4)
LT8650SIV#WPBF FAQ
1.How can I place an order for LT8650SIV#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8650SIV#WPBF 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#WPBF reliable?
The price and inventory of LT8650SIV#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8650SIV#WPBF is usually 5 days.
3.What payment methods are accepted for LT8650SIV#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8650SIV#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8650SIV#WPBF?
LT8650SIV#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8650SIV#WPBF 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#WPBF?
For technical support, including LT8650SIV#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8650SIV#WPBF requirements.
6.How does Aetrix verify that LT8650SIV#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8650SIV#WPBF 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#WPBF meets industry standards.
7.What is the process for return or replacement of LT8650SIV#WPBF?
All LT8650SIV#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8650SIV#WPBF, 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#WPBF part is unused and in its original packaging.
Return procedure for LT8650SIV#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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