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Analog Devices Inc. LT8650SEV#PBF
- Part No.:
- LT8650SEV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 32-TFQFN Exposed Pad, 28 Leads
- Datasheet:
-
LT8650SEV#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A DL 32LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:225
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Product details
Overview
LT8650SEV#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 and industrial power supplies.
For engineers reviewing the LT8650SEV#PBF datasheet, LT8650SEV#PBF pinout, LT8650SEV#PBF application, or LT8650SEV#PBF equivalent, key selection factors include dual-channel 42V input capability, 40ns minimum on-time for high step-down ratios, external VC pins for fast transient response and current sharing, CLKOUT synchronization for multi-phase designs, and AEC-Q100 qualification for automotive use.
Technical Context
The LT8650SEV#PBF implements peak current mode control with dual independent channels sharing a common VCC bias rail and thermal monitoring. Each channel features programmable switching frequency (300kHz–3MHz via RT resistor), selectable operation modes (Burst Mode, Forced Continuous, Spread Spectrum), and open-drain power-good outputs (PG1/PG2) with ±7.5% regulation window.
Its Silent Switcher®2 architecture integrates internal bypass capacitors on VIN1, VIN2, VCC, BST1, and BST2 pins to minimize high-frequency loop area, enabling robust EMI performance without layout sensitivity. The device supports external compensation via VC1/VC2 pins and output voltage tracking via SS1/SS2 pins for controlled startup sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 42V - supports wide-range industrial and automotive battery inputs including 12V, 24V, and 36V systems. |
| Output Current (per channel) | 4A continuous, 6A peak - enables dual-rail power delivery for SoC+FPGA or processor+memory subsystems. |
| Quiescent Current | 6.2µA in Burst Mode - sustains ultra-low power standby in always-on automotive modules and IoT edge nodes. |
| Switching Frequency | 300kHz to 3MHz (RT-programmable) - allows optimization of size (high fSW) vs. efficiency (low fSW) and EMI filtering requirements. |
| Minimum On-Time | 40ns - enables high step-down conversion (e.g., 42V→3.3V at 2MHz) without pulse-skipping instability. |
| Feedback Reference Voltage | 0.794V to 0.806V - tight tolerance ensures accurate output regulation across temperature and load conditions. |
| Thermal Range | –40°C to +125°C junction - qualified for under-hood automotive and harsh industrial environments. |
| EMI Performance | CISPR 25 Class 5 compliant with spread spectrum - eliminates need for external EMI filters in automotive infotainment and ADAS designs. |
Pinout & Package
LT8650SEV#PBF uses a 32-pin LQFN package (6mm × 4mm × 0.94mm) with exposed thermal pad (pins 33–38) soldered to PCB ground for optimal thermal dissipation (θJA = 16.18°C/W). Pin functions are validated per Analog Devices Rev. D datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1, VIN2 (Pins 4,5,7,8) | Channel 1 & 2 input supply rails | Independent high-voltage inputs; VIN1 must be ≥3V for both channels to operate; local ceramic bypassing required. |
| EN/UV1, EN/UV2 (Pins 11,12) | Channel enable / undervoltage lockout | Hysteretic threshold (0.74V/0.77V) enables reliable startup/shutdown; supports resistor-divider VIN monitoring. |
| SW1, SW2 (Pins 22,23,19,20) | Power switch node outputs | Connect to external inductors and bootstrap capacitors; low-inductance routing critical for EMI and efficiency. |
| FB1, FB2 (Pins 28,31) | Output voltage feedback inputs | Regulated to 0.8V reference; sets output via resistor divider; enables precision 5V/3.3V or custom rail generation. |
| VC1, VC2 (Pins 27,32) | Error amplifier compensation outputs | Support internal (VCC tie) or external RC compensation for optimized transient response and current sharing. |
| CLKOUT (Pin 17) | Phase-synchronized clock output | Provides 90°-phase-shifted 50% duty cycle signal for 4-phase 16A supply when cascading two LT8650S devices. |
| TEMP (Pin 13) | Junction temperature monitor | 250mV at 25°C with 9.5mV/°C slope; requires Forced Continuous Mode for valid readout across full load range. |
| GND (Pins 2,10,33–38) | System ground and thermal pad | Exposed pad (pins 33–38) must be soldered to PCB ground plane to achieve specified θJA and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher®2 Architecture | Integrated ceramic bypass capacitors on VIN1/VIN2/VCC/BST1/BST2 reduce radiated EMI by >30dB vs. first-gen, eliminating layout-dependent tuning. |
| Dual Independent Channels | Each channel supports separate input, enable, feedback, soft-start, and power-good signals - enables asymmetric rail design and fault isolation. |
| External Synchronization & Multi-Phase Scaling | CLKOUT + SYNC pins allow precise phase alignment of up to four regulators - reduces input/output ripple and enables 16A scalable power solutions. |
| Ultralow Quiescent Current | 6.2µA total IQ in Burst Mode with both channels regulating - extends battery life in always-on telematics and sensor nodes. |
| Fast Transient Response | 40ns min on-time + external VC compensation enables <10µs recovery from 2A→4A load steps at 3.3V output. |
| AEC-Q100 Qualified | Grade E (–40°C to +125°C) qualification confirmed - meets automotive reliability, HTOL, and ESD requirements for front-end ECUs and ADAS cameras. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: Dual-rail power for SoC (5V core) and DDR memory interface (3.3V I/O) in head-unit systems with 12V battery input and strict CISPR 25 EMI limits. IC Role / Device Role: Primary dual-output buck regulator providing regulated, synchronized, low-noise power with integrated EMI suppression. Use Value: Eliminates discrete EMI filters and reduces BOM count by 7 components while meeting Class 5 radiated emission limits at 150kHz–108MHz. |
Use Scenario: Compact 24V-to-5V/3.3V conversion for programmable logic controller backplane with space-constrained DIN-rail mounting. IC Role / Device Role: High-density dual-channel regulator supporting isolated field-side I/O and controller-side logic rails. Use Value: 4A/channel capability enables single-chip powering of multiple isolated DC-DC modules, reducing board area by 35% vs. discrete solutions. |
| Medical Imaging Sensor Hub | EV Battery Management System (BMS) Auxiliary Supply |
Use Scenario: Low-noise, low-IQ power for CMOS image sensors and ADC front-ends in portable ultrasound devices requiring clean 3.3V analog and 5V digital rails. IC Role / Device Role: Dual-output regulator with Burst Mode and spread spectrum to minimize switching noise coupling into sensitive analog signal paths. Use Value: Output ripple <10mVP-P and 6.2µA IQ extend battery runtime beyond 8 hours while preserving SNR in 16-bit ADC measurements. |
Use Scenario: Auxiliary 42V battery-derived power for microcontroller, CAN transceiver, and cell-monitoring ICs in modular BMS stacks. IC Role / Device Role: High-input-voltage dual buck converter with AEC-Q100 qualification and thermal monitoring for safety-critical auxiliary power. Use Value: TEMP pin integration enables real-time junction temperature reporting to BMS host, satisfying ISO 26262 ASIL-B diagnostic coverage requirements. |
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 |
|---|---|---|---|
| LT8640SEV#PBF | Single-channel 4A, 42V buck; no second channel, no CLKOUT, no VC2/SS2/PG2 pins; identical Silent Switcher 2 EMI performance and 6.2µA IQ. | Only suitable where dual-rail capability is unnecessary; cannot support independent 5V+3.3V outputs or multi-phase scaling. | Select when system requires only one regulated rail and board space is constrained - saves ~30% footprint vs. LT8650SEV#PBF. |
| MPQ4436GR-A | Dual-channel 4A, 36V buck from Monolithic Power Systems; 17µA IQ in skip mode; no integrated EMI caps; no spread spectrum; no CLKOUT or TEMP pin. | Lacks automotive qualification and CISPR 25 compliance; requires external EMI filtering; no thermal monitoring or multi-phase sync capability. | Consider for cost-sensitive industrial applications where EMI is managed externally and AEC-Q100 is not required. |
Compared with LT8640SEV#PBF and MPQ4436GR-A, the LT8650SEV#PBF uniquely delivers dual-channel 42V operation with integrated EMI suppression, AEC-Q100 qualification, and multi-phase scalability - making it the only option for automotive-grade dual-rail power with zero-layout EMI tuning.
Availability
LT8650SEV#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, medical imaging sensor hubs, and EV battery management auxiliary supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LT8650SEV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT8650S product line was designed specifically for high-reliability dual-rail power conversion in automotive and industrial environments, emphasizing ultralow EMI, wide input range, and AEC-Q100 qualification - with LT8650SEV#PBF representing the standard temperature grade variant.
FAQ
What is the maximum supported switching frequency for LT8650SEV#PBF?
The LT8650SEV#PBF supports a programmable switching frequency range of 300kHz to 3MHz using an external resistor on the RT pin. At 3MHz, the device maintains high efficiency and stable operation with appropriate inductor selection and PCB layout - verified in the DC2407A demo board with 1.0µH inductors and 2MHz operation achieving 93.3% efficiency at 4A output.
Does LT8650SEV#PBF require external compensation components?
The LT8650SEV#PBF supports both internal and external compensation. Connecting VC1/VC2 to VCC enables internal compensation with 6.2µA quiescent current; adding external RC networks to VC1/VC2 provides adjustable loop bandwidth and faster transient response but increases IQ to ~50µA per channel - confirmed in Electrical Characteristics Table and Applications Information section.
Can LT8650SEV#PBF operate with different input voltages on VIN1 and VIN2?
Yes, LT8650SEV#PBF supports independent input supplies on VIN1 and VIN2 - VIN2 can be driven from a separate source (e.g., 24V) while VIN1 is supplied from 12V, provided VIN1 remains ≥3V to power internal circuitry. This capability is explicitly documented in the PIN FUNCTIONS section for VIN2 and validated in typical application schematics.
How is thermal monitoring implemented on LT8650SEV#PBF?
LT8650SEV#PBF provides junction temperature sensing via the TEMP pin (Pin 13), outputting 250mV at 25°C with a linear 9.5mV/°C slope. Valid readings require Forced Continuous Mode operation - Burst Mode invalidates the TEMP output during light loads, as stated in the PIN FUNCTIONS description and confirmed in Figure G29 of the datasheet.
Is LT8650SEV#PBF pin-compatible with other variants like LT8650SIV#PBF?
Yes, LT8650SEV#PBF shares identical pinout, package (32-pin LQFN), and electrical functionality with LT8650SIV#PBF and LT8650SHV#PBF - differing only in guaranteed operating temperature range (–40°C to +125°C for LT8650SEV#PBF vs. +150°C for SHV). Mechanical and schematic compatibility is confirmed in the ORDER INFORMATION table and Package Drawing notes.
LT8650SEV#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)
LT8650SEV#PBF FAQ
1.How can I place an order for LT8650SEV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8650SEV#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 LT8650SEV#PBF reliable?
The price and inventory of LT8650SEV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8650SEV#PBF is usually 5 days.
3.What payment methods are accepted for LT8650SEV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8650SEV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8650SEV#PBF?
LT8650SEV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8650SEV#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 LT8650SEV#PBF?
For technical support, including LT8650SEV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8650SEV#PBF requirements.
6.How does Aetrix verify that LT8650SEV#PBF is sourced from the original manufacturer or authorized distributors?
All LT8650SEV#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 LT8650SEV#PBF meets industry standards.
7.What is the process for return or replacement of LT8650SEV#PBF?
All LT8650SEV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8650SEV#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 LT8650SEV#PBF part is unused and in its original packaging.
Return procedure for LT8650SEV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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