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Analog Devices Inc. LT8650SHV#PBF
- Part No.:
- LT8650SHV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8650SHV#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A DL 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,560
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Product details
Overview
LT8650SHV#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, with 6.2µA quiescent current in Burst Mode and integrated Silent Switcher®2 architecture for ultralow EMI. It supports independent 5V/4A and 3.3V/4A outputs at 2MHz switching frequency in automotive power systems.
For engineers reviewing the LT8650SHV#PBF datasheet, LT8650SHV#PBF pinout, LT8650SHV#PBF application, or LT8650SHV#PBF equivalent, key selection factors include AEC-Q100 qualification, 150°C max junction temperature rating, dual VC pins for fast transient response and current sharing, CLKOUT synchronization capability, and 4mm × 6mm 32-pin LQFN package with exposed thermal pad.
Technical Context
The LT8650SHV#PBF implements peak current mode control with 40ns minimum on-time, enabling high step-down ratios at up to 3MHz switching frequency. Its second-generation Silent Switcher architecture integrates bypass capacitors for VIN1, VIN2, VCC, BST1, and BST2 to minimize high-frequency current loop area and eliminate PCB layout sensitivity for EMI compliance.
Each channel features independent EN/UV, PG, SS, FB, and VC pins, supporting flexible sequencing, output tracking, external compensation, and fault monitoring. The device supports forced continuous mode, Burst Mode, and spread spectrum operation - with CLKOUT enabling 4-phase interleaving when synchronizing two chips.
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+) |
| Output Current (per channel) | 4A continuous, 6A peak - enables dual-rail power for SoC + peripheral subsystems without derating |
| Quiescent Current | 6.2µA in Burst Mode - sustains >10-year battery life in always-on automotive modules |
| Switching Frequency | 300kHz to 3MHz (RT-programmable) - allows optimization of size vs. efficiency; 2MHz typical for compact 1µH inductors |
| Feedback Reference | 0.790V to 0.810V - tight 2.5% tolerance ensures ±1% output regulation across line/load/temperature |
| Min On-Time | 40ns - enables 12V-to-1V conversion at 2MHz without pulse-skipping or instability |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood automotive applications |
Pinout & Package
LT8650SHV#PBF uses a 32-pin LQFN package (6mm × 4mm × 0.94mm) with exposed thermal pad (pins 33–38, GND). Thermal resistance θJA = 16.18°C/W; exposed pad must be soldered to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (pins 4,5) | Channel 1 input supply | Must be ≥3V for operation; powers internal circuitry and top switch; requires local ceramic bypass |
| VIN2 (pins 7,8) | Channel 2 input supply | Can differ from VIN1 but requires VIN1 present; independent input path improves rail isolation |
| EN/UV1 & EN/UV2 (pins 11,12) | Enable/undervoltage lockout | Hysteresis (30mV) prevents chatter; threshold 0.74V/0.77V enables programmable input dropout |
| PG1 & PG2 (pins 14,15) | Power good open-drain outputs | Assert high only when FB within ±7.5% and no faults - used for system power sequencing |
| VC1 & VC2 (pins 27,32) | Error amplifier outputs | Support external compensation networks for optimized transient response or current sharing |
| CLKOUT (pin 17) | Phase-sync clock output | 90° out-of-phase square wave in FCM - enables 4-phase 16A supply with two ICs |
| SYNC (pin 16) | Mode control & sync input | Ground = Burst Mode; float = FCM; 2.8–4V = FCM + spread spectrum; external clock = sync source |
| TEMP (pin 13) | Junction temperature monitor | 250mV @ 25°C, 9.5mV/°C slope - valid only in FCM; enables thermal telemetry and shutdown coordination |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 architecture | Integrated VIN/VCC/BST bypass caps reduce radiated EMI by >30dB vs. first-gen; passes CISPR 25 Class 5 without filter |
| Dual independent VC pins | Enable per-channel loop compensation tuning and active current sharing between channels or parallel ICs |
| CLKOUT synchronization | Generates precise 4-phase timing signal - eliminates need for external clock generator in high-current multi-phase designs |
| AEC-Q100 Grade H qualification | Validated for –40°C to +150°C operation with lifetime reliability data - suitable for engine control, ADAS, and infotainment |
| Programmable spread spectrum | Reduces peak EMI amplitude by spreading fundamental and harmonics - simplifies EMC certification in dense layouts |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Module |
|---|---|
Use Scenario: Powers microcontroller, CAN transceiver, and sensor interface in under-hood ECU exposed to 125°C ambient and 40V load dump. IC Role / Device Role / Timing Role: Dual-rail regulator providing isolated 5V (MCU core) and 3.3V (peripherals) with independent enable and power-good signaling. Use Value: AEC-Q100 Grade H rating and 42V input withstand ensure uninterrupted operation during cranking and load dump transients. | Use Scenario: Supplies image sensor, ISP, and serializer in rear-view camera module requiring low-noise, low-EMI power near RF antennas. IC Role / Device Role / Timing Role: Primary DC/DC converter with spread spectrum and Silent Switcher2 to meet CISPR 25 Class 5 radiated emissions limits. Use Value: Integrated bypass caps and layout-insensitive EMI performance eliminate need for external EMI filters, saving board space and BOM cost. |
| Industrial PLC I/O Module | Automotive Infotainment Head Unit |
Use Scenario: Delivers stable 5V/4A and 3.3V/4A rails to FPGA, ADCs, and communication interfaces in DIN-rail mounted controller. IC Role / Device Role / Timing Role: Dual-channel buck regulator with VC pins enabling fast transient response to dynamic FPGA core voltage demands. Use Value: 40ns min on-time supports 24V-to-1.2V conversion at 2MHz, enabling compact 1µH inductors and <1cm² solution size. | Use Scenario: Powers application processor, display driver, and audio codec in head unit with strict standby current and thermal constraints. IC Role / Device Role / Timing Role: Always-on power manager using Burst Mode (6.2µA IQ) for low-power states and FCM for active processing. Use Value: Ultralow quiescent current extends battery runtime during vehicle sleep mode while maintaining fast wake-up response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8650SIV#PBF | Same silicon, rated for –40°C to +125°C junction temperature (Grade I) | Not qualified for under-hood automotive use; limited to cabin or industrial environments | Select when AEC-Q100 Grade H is not required and cost optimization is prioritized |
| LT8650SEV#PBF | Same silicon, rated for –40°C to +125°C with commercial MSL3 packaging | Lacks automotive qualification and extended thermal margin; intended for general-purpose evaluation | Choose for prototyping or non-automotive applications where 150°C operation is unnecessary |
Compared with LT8650SIV#PBF and LT8650SEV#PBF, the LT8650SHV#PBF uniquely supports 150°C junction operation and full AEC-Q100 Grade H compliance - making it the only option for high-temperature automotive power delivery where thermal derating and long-term reliability are critical.
Availability
LT8650SHV#PBF is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, and industrial PLC I/O requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT8650SHV#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 LT8650S product line delivers dual-channel, high-efficiency, ultralow-EMI step-down regulators specifically engineered for demanding automotive and industrial power systems where thermal robustness, EMI compliance, and functional safety are essential.
FAQ
What is the maximum junction temperature rating for LT8650SHV#PBF?
The LT8650SHV#PBF is rated for a maximum junction temperature of +150°C and is qualified per AEC-Q100 Grade H. This rating is validated across process, voltage, and temperature corners and supported by lifetime reliability data - making it suitable for under-hood automotive applications such as engine control units and transmission control modules where ambient temperatures exceed 125°C.
How does LT8650SHV#PBF achieve ultralow EMI without external filtering?
The LT8650SHV#PBF achieves ultralow EMI through second-generation Silent Switcher®2 architecture, which integrates ceramic bypass capacitors inside the package for VIN1, VIN2, VCC, BST1, and BST2. This minimizes high-frequency current loop area and eliminates PCB layout sensitivity - enabling CISPR 25 Class 5 compliance even on standard 2-layer boards without added EMI filters or ferrites.
Can LT8650SHV#PBF synchronize with other regulators for multiphase operation?
Yes, the LT8650SHV#PBF supports multiphase operation via its CLKOUT pin and SYNC input. In forced continuous mode, CLKOUT provides a 50% duty cycle square wave 90° out-of-phase with Channel 1 - allowing two LT8650SHV#PBF ICs to generate a synchronized 4-phase, 16A supply. An external clock applied to SYNC enables precise frequency and phase alignment with other power stages.
What is the purpose of the TEMP pin on LT8650SHV#PBF?
TEMP (pin 13) on the LT8650SHV#PBF outputs a voltage proportional to junction temperature: 250mV at 25°C with a slope of 9.5mV/°C. Its output is only valid in forced continuous mode (FCM); it is invalid during Burst Mode at light loads. Designers use this pin for thermal telemetry, overtemperature warning, or coordinated system-level thermal management - especially critical in sealed automotive enclosures.
Does LT8650SHV#PBF support independent output voltage programming for each channel?
Yes, LT8650SHV#PBF supports fully independent output voltage programming via separate feedback resistor dividers on FB1 (channel 1) and FB2 (channel 2). Each channel regulates its respective FB pin to 0.790V–0.810V, enabling custom outputs such as 5V/4A and 3.3V/4A, or asymmetric configurations like 1.2V/4A and 3.3V/4A - all with independent enable, soft-start, and power-good signaling.
LT8650SHV#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-LQFN (6x4)
LT8650SHV#PBF FAQ
1.How can I place an order for LT8650SHV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8650SHV#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 LT8650SHV#PBF reliable?
The price and inventory of LT8650SHV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8650SHV#PBF is usually 5 days.
3.What payment methods are accepted for LT8650SHV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8650SHV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8650SHV#PBF?
LT8650SHV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8650SHV#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 LT8650SHV#PBF?
For technical support, including LT8650SHV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8650SHV#PBF requirements.
6.How does Aetrix verify that LT8650SHV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8650SHV#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 LT8650SHV#PBF meets industry standards.
7.What is the process for return or replacement of LT8650SHV#PBF?
All LT8650SHV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8650SHV#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 LT8650SHV#PBF part is unused and in its original packaging.
Return procedure for LT8650SHV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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