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Analog Devices Inc. LT8650SHV-1#PBF
- Part No.:
- LT8650SHV-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8650SHV-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A DL 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,959
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Product details
Overview
LT8650SHV-1#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 integrated bypass capacitors for layout-insensitive EMI performance - used in automotive infotainment power rails and industrial PLC I/O modules.
For engineers reviewing the LT8650SHV-1#PBF datasheet, LT8650SHV-1#PBF pinout, LT8650SHV-1#PBF application, or LT8650SHV-1#PBF equivalent, key selection considerations include H-grade 150°C junction rating, external BST capacitor requirement, dual VC pins for loop compensation/current sharing, CLKOUT-enabled 4-phase synchronization, and LQFN-32 (4mm × 6mm) thermal pad grounding.
Technical Context
The LT8650SHV-1#PBF implements peak-current-mode control with independent oscillator frequency programming via RT pin (300kHz–3MHz), fast 40ns minimum on-time, and dual error amplifiers with VC1/VC2 pins supporting internal or external compensation. Its Silent Switcher®2 architecture integrates VIN1/VIN2 bypass capacitors to minimize high-frequency current loop area and suppress radiated EMI without PCB layout sensitivity.
It supports three operating modes: Burst Mode (6.2µA IQ), forced continuous mode (FCM), and spread-spectrum modulation (SSM) - selectable via SYNC pin state. Dual PG1/PG2 open-drain outputs provide independent power-good status, while TEMP pin delivers 9.5mV/°C analog temperature sensing referenced to 250mV at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide automotive battery transients and industrial 24V/36V supplies without pre-regulation. |
| Output Current per Channel | 4A continuous, 6A peak - enables dual-rail 5V/3.3V power delivery for SoC + peripheral subsystems. |
| Quiescent Current (Burst) | 6.2µA - maintains >85% efficiency at 100µA load, critical for always-on automotive modules. |
| Switching Frequency | 300kHz to 3MHz (RT-programmable) - allows optimization of size (high-freq) vs. efficiency (low-freq). |
| Feedback Reference Voltage | 0.790V to 0.810V - tight 0.8V ±1.25% tolerance ensures accurate output regulation across temperature. |
| Minimum On-Time | 40ns - enables high step-down ratios (e.g., 42V→3.3V at 2MHz) without pulse-skipping instability. |
| Junction Temperature Range | –40°C to +150°C - H-grade qualification meets AEC-Q100 Grade 1 requirements for under-hood use. |
Pinout & Package
LT8650SHV-1#PBF uses a 32-pin LQFN package (4mm × 6mm × 0.94mm) with exposed thermal pad (pins 33–38, GND). The package requires soldering the exposed pad to PCB ground plane for thermal management (θJA = 23°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 (Pins 4,5) | Channel 1 Input Supply | Supplies internal circuitry and top FET of Ch1; must be locally bypassed with low-ESR ceramic cap. |
| VIN2 (Pins 7,8) | Channel 2 Input Supply | Supplies top FET of Ch2; can differ from VIN1 but requires VIN1 ≥3V for operation. |
| BST1/BST2 (Pins 24,18) | Bootstrap Drive Voltage | Requires 0.1µF ceramic cap between BSTx and SWx to enable high-side NMOS gate drive. |
| SW1/SW2 (Pins 22,23 / 19,20) | Power Switch Output | Connects to inductor and BST cap; must be minimized on PCB to reduce EMI radiation. |
| VC1/VC2 (Pins 27,32) | Error Amplifier Output | Enables external loop compensation or current sharing; internal compensation reduces IQ to 2.5µA/channel. |
| CLKOUT (Pin 17) | Phase-Shifted Clock Output | Provides 90°-shifted 50% duty cycle square wave in FCM for 4-phase interleaving with other LT8650S-1 units. |
| TEMP (Pin 13) | Junction Temperature Monitor | Outputs 250mV @ 25°C + 9.5mV/°C; valid only in FCM - invalid during light-load Burst Mode. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 Architecture | Integrated VIN bypass capacitors eliminate layout-dependent EMI; passes CISPR 25 Class 5 radiated emissions with minimal filtering. |
| Dual Independent VC Pins | Enable precise loop compensation tuning per channel and active current sharing between parallel regulators. |
| H-Grade 150°C Junction Rating | X8R internal capacitors allow reliable operation in under-hood automotive environments without derating. |
| Multi-Mode Operation Control | SYNC pin selects Burst Mode (low IQ), FCM (fixed fSW), or SSM (dithered fSW) - no external components required. |
| 4-Phase Synchronization Capability | CLKOUT + SYNC interface enables seamless interleaving of up to four LT8650S-1 units for 16A total output with reduced ripple. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering SoC core (5V) and interface peripherals (3.3V) in head-unit systems with cold-crank (4.5V) and load-dump (42V) transients. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing isolated, sequenced, and monitored 5V/3.3V rails with PG1/PG2 status signaling. Use Value: 6.2µA Burst Mode IQ extends battery life during vehicle sleep; 150°C rating survives engine bay ambient temperatures. |
Use Scenario: Generating stable 5V and 3.3V supplies for digital I/O isolation, ADC reference, and microcontroller in programmable logic controllers. IC Role / Device Role / Timing Role: High-efficiency, low-noise DC/DC converter delivering regulated rails with EMI immunity for noise-sensitive analog signal chains. Use Value: Silent Switcher®2 eliminates need for ferrite beads/shielding; 40ns min-on-time supports 24V-to-3.3V conversion at 2MHz. |
| Medical Imaging Sensor Bias | Test & Measurement Equipment |
Use Scenario: Providing low-noise, tightly regulated bias voltages for CCD/CMOS image sensor arrays in portable ultrasound devices. IC Role / Device Role / Timing Role: Dual-output regulator with independent soft-start (SS1/SS2) enabling controlled ramp-up of analog sensor supplies to prevent transient coupling. Use Value: <10mVP-P output ripple and <±0.5% load regulation ensure sensor SNR integrity; TEMP pin enables thermal derating. |
Use Scenario: Powering FPGA I/O banks and ADC/DAC cores in benchtop instruments requiring clean, stable, and synchronized supplies. IC Role / Device Role / Timing Role: Synchronized multi-phase power source using CLKOUT/SYNC to align switching edges and cancel ripple in precision analog sections. Use Value: 4-phase interleaving cuts output ripple by 4× vs. single-phase; spread spectrum further lowers EMI peaks interfering with RF measurements. |
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 |
|---|---|---|---|
| LT8650S-1#PBF | Standard grade (–40°C to 125°C); no X8R internal caps; lower max junction temp. | Not qualified for under-hood automotive; unsuitable for sustained 150°C ambient. | Select when cost-sensitive and thermal environment stays ≤125°C. |
| LT8650SEV-1#PBF | E-grade (–40°C to 125°C); same pinout and electrical specs; different marking and MSL rating. | Lacks H-grade thermal robustness; not validated for extended high-temp operation. | Use for commercial/industrial applications where 125°C max junction is sufficient. |
Compared with LT8650S-1#PBF and LT8650SEV-1#PBF, the LT8650SHV-1#PBF uniquely supports 150°C continuous operation via X8R capacitors and mandates external BST capacitors - making it the only choice for AEC-Q100-compliant automotive power designs requiring full temperature range reliability.
Availability
LT8650SHV-1#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power supplies, and medical imaging equipment requiring stable component supply with guaranteed long-term availability and RoHS/WEEE compliance.
Supply support for LT8650SHV-1#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 precision instrumentation, industrial automation, and automotive safety markets.
The LT8650S family was designed specifically for high-density, low-EMI power conversion in harsh environments - emphasizing Silent Switcher®2 integration, wide input range, and automotive-grade reliability.
FAQ
What is the maximum junction temperature rating for the LT8650SHV-1#PBF?
The LT8650SHV-1#PBF is rated for continuous operation up to +150°C junction temperature. This H-grade specification is enabled by X8R-type internal capacitors and validated over –40°C to +150°C, distinguishing it from standard-grade LT8650S-1 variants limited to 125°C.
Does the LT8650SHV-1#PBF require external boost capacitors?
Yes, the LT8650SHV-1#PBF requires external 0.1µF ceramic boost capacitors between BST1–SW1 and BST2–SW2. Unlike some monolithic regulators, its internal charge pump does not eliminate this requirement - especially critical for maintaining gate drive above VIN during high-duty-cycle operation.
How does the LT8650SHV-1#PBF achieve ultralow EMI without complex PCB layout?
The LT8650SHV-1#PBF integrates ceramic bypass capacitors directly into the LQFN package for VIN1 and VIN2. This minimizes high-frequency current loop area and decouples switching noise at the source - enabling CISPR 25 Class 5 compliance even on simple 2-layer PCBs without added shielding or filters.
Can the LT8650SHV-1#PBF synchronize with external clock sources?
Yes, the LT8650SHV-1#PBF accepts an external clock on the SYNC pin to force both channels into forced continuous mode and align switching edges. The CLKOUT pin then mirrors the SYNC waveform's frequency, phase, and duty cycle - enabling precise multi-phase interleaving across multiple ICs.
What is the function of the TEMP pin on the LT8650SHV-1#PBF?
TEMP (Pin 13) provides an analog voltage proportional to die temperature: 250mV at 25°C with 9.5mV/°C slope. It is only valid in forced continuous mode; Burst Mode invalidates the reading due to intermittent internal bias current. This allows real-time thermal monitoring for system-level derating or fault detection in the LT8650SHV-1#PBF.
LT8650SHV-1#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:
- Obsolete
- 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-1#PBF FAQ
1.How can I place an order for LT8650SHV-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8650SHV-1#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-1#PBF reliable?
The price and inventory of LT8650SHV-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LT8650SHV-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8650SHV-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8650SHV-1#PBF?
LT8650SHV-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8650SHV-1#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-1#PBF?
For technical support, including LT8650SHV-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8650SHV-1#PBF requirements.
6.How does Aetrix verify that LT8650SHV-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT8650SHV-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LT8650SHV-1#PBF?
All LT8650SHV-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8650SHV-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LT8650SHV-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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