My Inquiry
My Account
Analog Devices Inc. LT8640SEV-2#PBF
- Part No.:
- LT8640SEV-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TFQFN Exposed Pad
- Datasheet:
-
LT8640SEV-2#PBF.pdf
- Description:
- IC REG BUCK ADJ 6A 24LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:879
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT8640SEV-2#PBF from Analog Devices is a 42V, 6A synchronous step-down Silent Switcher regulator with internal compensation, 2.5µA quiescent current in Burst Mode, 30ns minimum on-time, and 200kHz–3MHz adjustable switching frequency. It delivers up to 96% efficiency at 1MHz (12VIN→5VOUT) and targets automotive and industrial power supplies requiring ultralow EMI and high light-load efficiency.
For engineers reviewing the LT8640SEV-2#PBF datasheet, LT8640SEV-2#PBF pinout, LT8640SEV-2#PBF application, or LT8640SEV-2#PBF equivalent, this page provides verified package mapping (24-lead LQFN), confirmed thermal performance (θJA = 24°C/W on demo board), validated EMI suppression via Silent Switcher architecture, and real-world transient response data for 100mA–1.1A load steps.
Technical Context
The LT8640SEV-2#PBF implements peak current mode control with a dedicated internal error amplifier and fixed 0.970V feedback reference. Its Silent Switcher architecture uses symmetrical layout and integrated input capacitors to suppress common-mode EMI, enabling CISPR 25 Class 5 compliance without external filters. The 30ns minimum on-time supports high step-down ratios (e.g., 42VIN→3.3VOUT) at 2MHz.
Burst Mode operation reduces VIN quiescent current to 2.5µA (12VIN→3.3VOUT), while forced continuous mode (FCM) enables deterministic switching across full load range. Spread spectrum modulation-enabled via SYNC/MODE pin-further lowers peak radiated emissions by ±22% frequency dithering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.4V to 42V - supports wide automotive battery transients and industrial 24/36V rails. |
| Output Current | 6A continuous, 7A peak - sustains full load under 125°C junction temperature with proper PCB copper. |
| Quiescent Current | 2.5µA in Burst Mode (12VIN→3.3VOUT) - enables >1-year battery life in always-on automotive modules. |
| Switching Frequency | 200kHz to 3MHz (RT-programmable) - allows optimization of size (high-freq) vs. efficiency (low-freq). |
| Feedback Reference | 0.970V ±0.006V - tight tolerance enables accurate output regulation with standard resistor dividers. |
| EMI Performance | CISPR 25 Class 5 compliant (radiated) with integrated filter - eliminates need for external EMI chokes in most designs. |
| Min On-Time | 30ns - enables 42VIN→3.3VOUT conversion at 2MHz without pulse-skipping instability. |
Pinout & Package
LT8640SEV-2#PBF is housed in a thermally enhanced 24-lead LQFN package (4mm × 4mm × 0.94mm) with exposed GND pads (pins 25–28) soldered to PCB for θJA = 24°C/W on demo board. Pin count and footprint match standard QFN-24 but include dual VIN and SW pins for low-inductance high-current routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (8–12) | Power switch node | Five paralleled pins reduce conduction loss and parasitic inductance; must connect directly to inductor with minimal trace area. |
| VIN (5,6,13,14) | Main input supply | Four dedicated pins distribute high di/dt input current; require local 1µF ceramic caps per pair plus bulk capacitance. |
| BIAS (1) | Internal regulator supply | Accepts VOUT (≥3.3V) to reduce VIN current draw; improves efficiency at high input voltages. |
| SYNC/MODE (20) | Operating mode selector | GND = Burst Mode; float = FCM; INTVCC = spread spectrum; external clock = synchronization. |
| TR/SS (21) | Soft-start & tracking control | 1.9µA internal pull-up enables capacitor-programmed slew rate; supports power sequencing with other rails. |
| PG (23) | Power good indicator | Open-drain output asserts high when FB is within ±8% of 0.970V and no fault conditions exist. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Integrated input capacitors + symmetrical layout reduce radiated EMI by >30dB vs. conventional buck regulators. |
| Ultralow IQ Burst Mode | 2.5µA input current at no load enables always-on systems with 10+ year coin-cell battery life. |
| Adjustable spread spectrum | ±22% frequency dithering lowers peak EMI amplitude without affecting average switching frequency. |
| Fast transient response | Sub-20µs recovery from 100mA→1.1A load step with <100mV undershoot using internal compensation. |
| AEC-Q100 qualified | Grade E (–40°C to +125°C) ensures reliability in automotive infotainment, ADAS, and body electronics. |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V/5V logic, CAN transceivers, and display controllers in head units with cold-crank (4.5V) and load-dump (42V) immunity. IC Role / Device Role / Timing Role: Primary 42V-input DC/DC converter delivering regulated 5V/3.3V with <10mVP-P ripple and fast line/load transient response. Use Value: Eliminates need for pre-regulator stages; Silent Switcher architecture meets OEM EMI requirements without shielding cans. |
Use Scenario: Generating isolated 5V/12V rails for analog sensor front-ends and digital I/O in programmable logic controllers operating in noisy factory environments. IC Role / Device Role / Timing Role: High-efficiency, low-noise point-of-load regulator with programmable soft-start for controlled power-up sequencing. Use Value: 30ns min on-time enables direct 24V→3.3V conversion, reducing BOM count and board space vs. two-stage solutions. |
| Medical Portable Monitor | EV Battery Management System |
Use Scenario: Supplying 5V to microcontroller, OLED display, and wireless BLE module in handheld diagnostic devices powered by Li-ion batteries (3.0–4.2V) with backup 12V adapter. IC Role / Device Role / Timing Role: Wide-input buck converter supporting both battery and adapter inputs with seamless switchover and ultralow standby IQ. Use Value: 2.5µA quiescent current extends battery runtime during sleep mode; AEC-Q100 qualification validates long-term reliability. |
Use Scenario: Providing 3.3V bias for cell voltage monitors and isolation gate drivers in high-voltage battery packs (up to 42V nominal). IC Role / Device Role / Timing Role: Robust primary regulator immune to high dv/dt noise from adjacent IGBT switching and meeting ASIL-B functional safety requirements. Use Value: Integrated overtemperature protection and ±8% PG accuracy enable safe, predictable power delivery in safety-critical subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT8643SEV-2#PBF | External compensation (VC pin), higher sleep IQ (230µA), no CLKOUT pin | Required for current sharing in parallel configurations or ultra-fast transient response with custom loop tuning | Select when design requires multi-phase operation or tighter output regulation under dynamic loads |
| MPQ4420AGL-Z | 36V max input, 2A output, no spread spectrum, 17µA IQ, QFN-10 package | Lower cost for non-automotive consumer/industrial apps where EMI is less stringent | Choose for space-constrained, cost-sensitive designs with ≤36V input and ≤2A load |
Compared with LT8640SEV-2#PBF, LT8643SEV-2#PBF offers superior transient performance at the cost of higher quiescent current and added compensation complexity, while MPQ4420AGL-Z provides a compact, lower-cost alternative for less demanding EMI and power requirements.
Availability
LT8640SEV-2#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC power supplies, and medical portable monitors requiring stable component supply, AEC-Q100 qualification, and guaranteed long-term availability.
Supply support for LT8640SEV-2#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 industrial, automotive, communications, and healthcare markets since 1965.
The LT8640S-2 product line delivers high-efficiency, ultralow-EMI power conversion for automotive and industrial applications where reliability, small solution size, and regulatory compliance are critical.
FAQ
What is the maximum input voltage rating for LT8640SEV-2#PBF?
The LT8640SEV-2#PBF has an absolute maximum input voltage rating of 42V on VIN, EN/UV, and PG pins. Operation is specified from 3.4V to 42V, making it suitable for 12V/24V/36V automotive and industrial systems with load dump and cold-crank transients. Exceeding 42V risks permanent damage per Absolute Maximum Ratings.
How does LT8640SEV-2#PBF achieve ultralow EMI performance?
The LT8640SEV-2#PBF achieves ultralow EMI through Analog Devices' Silent Switcher architecture: integrated input capacitors minimize high-di/dt loop area, symmetrical layout cancels magnetic fields, and optional spread spectrum modulation dithers switching frequency by ±22%. This enables CISPR 25 Class 5 compliance without external EMI filters on the DC2530A demo board.
Can LT8640SEV-2#PBF operate with a 3.0V input supply?
No. The LT8640SEV-2#PBF has a minimum specified input voltage of 3.4V. While the Absolute Maximum Ratings table lists 3.0V as a test condition, the Electrical Characteristics section confirms guaranteed operation starts at 3.4V. Below 3.4V, regulation cannot be maintained - for sub-3.4V inputs, consider the LT8640S-1 variant or alternative regulators.
What thermal performance can be expected from LT8640SEV-2#PBF in a typical layout?
On the DC2530A demo board, LT8640SEV-2#PBF achieves θJA = 24°C/W. With 4cm² of 2oz copper connected to the exposed GND pads (pins 25–28), junction temperature rise is ~48°C at 6A load (12VIN→5VOUT). Derating is required above 125°C junction temperature; the device includes thermal shutdown at 150°C.
Is LT8640SEV-2#PBF pin-compatible with LT8640S-2 variants like LT8640SIV-2#PBF?
Yes. All LT8640S-2 variants - including LT8640SEV-2#PBF, LT8640SIV-2#PBF, and LT8640SHV-2#PBF - share identical 24-lead LQFN packaging, pinout, and electrical specifications. Only temperature grade (E: –40°C to +125°C, I: same, H: –40°C to +150°C) and shipping form (tape-and-reel vs. tray) differ; no PCB changes are needed when substituting within the same grade.
LT8640SEV-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 24-TFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.97V
- Voltage - Output (Max):
- 42V
- Current - Output:
- 6A
- Frequency - Switching:
- 200kHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-LQFN (4x4)
LT8640SEV-2#PBF FAQ
1.How can I place an order for LT8640SEV-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8640SEV-2#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 LT8640SEV-2#PBF reliable?
The price and inventory of LT8640SEV-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8640SEV-2#PBF is usually 5 days.
3.What payment methods are accepted for LT8640SEV-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8640SEV-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8640SEV-2#PBF?
LT8640SEV-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8640SEV-2#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 LT8640SEV-2#PBF?
For technical support, including LT8640SEV-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8640SEV-2#PBF requirements.
6.How does Aetrix verify that LT8640SEV-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT8640SEV-2#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 LT8640SEV-2#PBF meets industry standards.
7.What is the process for return or replacement of LT8640SEV-2#PBF?
All LT8640SEV-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8640SEV-2#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 LT8640SEV-2#PBF part is unused and in its original packaging.
Return procedure for LT8640SEV-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT8640SEV-2#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
