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Analog Devices Inc. LT8672IMS#PBF
- Part No.:
- LT8672IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT8672IMS#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:245
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Product details
Overview
LT8672IMS#PBF from Analog Devices is an AEC-Q100 qualified active rectifier controller for automotive reverse battery protection and input ripple rectification. It drives an external N-channel MOSFET to replace Schottky diodes, delivering 20mV forward regulation voltage, 3V–42V operating range, and ultrafast transient response up to 100kHz (2VP-P). It enables cold-crank operation down to 3.2V battery voltage in 12V automotive ECUs.
For engineers reviewing the LT8672IMS#PBF datasheet, LT8672IMS#PBF pinout, LT8672IMS#PBF application, or LT8672IMS#PBF equivalent, key selection criteria include reverse input protection to –40V, 20µA operating quiescent current, integrated auxiliary boost regulator (11V above DRAIN), power good (PG) signaling, and MSOP-10 package compatibility with automotive thermal and layout constraints.
Technical Context
The LT8672IMS#PBF implements a dual-loop control architecture: a precision 20mV SOURCE–DRAIN regulation loop for steady-state conduction and independent fast pull-up (75mV threshold) and fast pull-down (–70mV threshold) comparators for sub-microsecond transient response to AC ripple up to 100kHz. Its gate driver delivers ±300mA peak current with 1.7µs turn-on and 0.6µs turn-off delay (10nF load).
An integrated hysteretic auxiliary boost regulator generates a stable 11V AUX–DRAIN supply (±0.8V tolerance) using an internal 100mA current-limited switch and external inductor, enabling full enhancement of logic-level N-MOSFETs across the full 3V–42V input range without external bias rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Regulation Voltage | 20mV typical - enables cold-crank operation at ≤3.2V battery by minimizing voltage drop across external MOSFET. |
| Operating Input Range | 3V to 42V - supports full automotive battery range including load dump (42V) and cold crank (3.2V). |
| Reverse Input Protection | –40V on SOURCE/EN/UVLO - survives reverse battery connection without damage or latch-up. |
| Quiescent Current | 20µA typical in operation - minimizes standby power loss in always-on vehicle modules. |
| Shutdown Current | 3.5µA maximum - reduces system leakage when EN/UVLO < 1.21V. |
| AC Ripple Rectification | Up to 100kHz at 2VP-P - meets ISO16750-2 and LV124 ECU ripple immunity requirements. |
| AUX–DRAIN Regulation | 11V ±0.8V - provides sufficient gate overdrive for low-RDS(ON) MOSFETs even at 3V input. |
Pinout & Package
LT8672IMS#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm, 0.5mm pitch) with θJA = 160°C/W. Exposed pad is not present in MSOP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (Pin 1) | Enable and undervoltage lockout input | Shuts down controller and boost regulator below 1.21V; ties to DRAIN for always-on operation. |
| GND (Pin 2) | No-function ground tie | Must be connected to PCB ground plane but carries no internal current path. |
| PG (Pin 3) | Open-drain power good output | Signals MOSFET readiness; pulls low during shutdown, AUX under-regulation, or >17µs FPU activation. |
| GND (Pin 4) | Main IC ground reference | Return for all internal circuitry; must connect directly to local GND plane with low-inductance trace. |
| NC (Pin 5) | No-connect terminal | Internally unconnected; may be left floating or tied to GND for mechanical stability. |
| AUXSW (Pin 6) | Boost regulator switch node | Drives external inductor; requires minimal PCB area to reduce EMI and switching losses. |
| AUX (Pin 7) | Boost regulator output | Provides 11V gate drive referenced to DRAIN; requires 1µF ceramic capacitor to DRAIN pin only. |
| DRAIN (Pin 8) | Input voltage sense and supply | Senses input rail and powers internal circuitry; must be bypassed with ≥4.7µF near IC. |
| SOURCE (Pin 9) | MOSFET source sense and return | Sense node for regulation loop; protected to –40V; total capacitance ≤60nF to ensure stability. |
| GATE (Pin 10) | MOSFET gate drive output | Delivers ±300mA peak current; connects directly to MOSFET gate with short, low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| 20mV forward regulation | Reduces minimum input voltage requirement during cold crank, eliminating need for buck-boost converters in 12V systems. |
| Integrated 11V auxiliary boost | Enables use of standard logic-level N-MOSFETs without external high-side bias, simplifying BOM and layout. |
| Power Good (PG) monitoring | Prevents load connection until AUX regulation is stable and MOSFET gate is fully enhanced, avoiding inrush or fault conditions. |
| –40V reverse input tolerance | Withstands reverse battery connection without external TVS clamping on SOURCE or EN/UVLO pins. |
| 100kHz ripple rectification | Meets stringent automotive EMC immunity standards (ISO16750-2, LV124) without increasing MOSFET thermal stress. |
Applications
| Automotive Battery Protection | Industrial Power Supplies |
|---|---|
Use Scenario: 12V automotive ECU subjected to reverse battery connection, load dump (42V), and cold crank (3.2V). IC Role / Device Role / Timing Role: Active rectifier controller replacing Schottky diode in input protection stage; regulates MOSFET to maintain 20mV drop. Use Value: Eliminates 0.3–0.5V diode drop, enabling direct buck conversion from 3.2V battery and reducing power loss by >90% vs. SBG2040CT. | Use Scenario: Industrial 24V DC power distribution unit requiring reverse polarity protection and ripple filtering. IC Role / Device Role / Timing Role: Controls external N-MOSFET as ideal diode in redundant power input path with fast transient response. Use Value: Withstands –40V reverse transients while maintaining <20µA quiescent current, extending uptime in unattended equipment. |
| Portable Instrumentation | Automotive ECU Input Ripple Conditioning |
Use Scenario: Battery-powered handheld test equipment with USB and Li-ion inputs subject to hot-plug and polarity reversal. IC Role / Device Role / Timing Role: Reverse protection controller enabling single-input dual-source operation with automatic source selection. Use Value: 3.5µA shutdown current preserves battery life; PG signal enables safe load enable sequencing after power stabilization. | Use Scenario: Automotive infotainment head unit exposed to 50kHz, 6VP-P supply ripple per ISO16750-2. IC Role / Device Role / Timing Role: Fast-acting rectifier controller synchronizing MOSFET conduction to input ripple zero-crossings. Use Value: Reduces output capacitor RMS current by >60% vs. passive diode solution, lowering CLOAD temperature rise and extending lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active rectifier controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM74700QDDFRQ1 | Fixed 25mV regulation; no integrated boost regulator; requires external 5V bias for gate drive. | Lacks auxiliary boost, limiting MOSFET selection to pre-biased or high-threshold devices; lower integration. | Choose LM74700QDDFRQ1 only if external 5V rail is available and 5mV higher dropout is acceptable. |
| TPS26600PWPR | Integrated 60V N-channel MOSFET; fixed 45mV dropout; no ripple rectification capability beyond 10kHz. | Monolithic solution eliminates external FET but cannot rectify >10kHz ripple; unsuitable for ISO16750-2 compliance. | Choose TPS26600PWPR for space-constrained designs where ripple frequency <10kHz and integrated FET suffices. |
Compared with LM74700QDDFRQ1 and TPS26600PWPR, LT8672IMS#PBF uniquely combines 20mV regulation, integrated 11V boost, and 100kHz ripple handling-enabling high-efficiency, compact reverse protection in demanding automotive ECUs without external bias or performance trade-offs.
Availability
LT8672IMS#PBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial power supplies, portable instrumentation, and automotive ECU input ripple conditioning requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LT8672IMS#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 LT8672IMS#PBF belongs to Analog Devices' Power by Linear™ active rectifier controller product line, designed specifically for AEC-Q100-compliant automotive reverse battery protection and high-frequency input ripple rectification in ECUs.
FAQ
What is the primary function of the LT8672IMS#PBF in automotive systems?
The LT8672IMS#PBF functions as an active rectifier controller that replaces Schottky diodes in automotive reverse battery protection circuits. It drives an external N-channel MOSFET to achieve a 20mV forward voltage drop, enabling reliable operation during cold crank (down to 3.2V) and surviving reverse inputs to –40V. Its integrated auxiliary boost regulator ensures full MOSFET enhancement across the full 3V–42V input range, making LT8672IMS#PBF essential for AEC-Q100-compliant ECUs requiring low-loss, high-reliability input protection.
How does the LT8672IMS#PBF handle high-frequency input ripple in automotive applications?
The LT8672IMS#PBF handles high-frequency input ripple using dual-path gate control: a precision 20mV regulation loop for steady-state conduction and independent fast pull-up (75mV) and fast pull-down (–70mV) comparators for sub-microsecond transient response. This architecture allows LT8672IMS#PBF to rectify up to 100kHz (2VP-P) and 50kHz (6VP-P) ripple, meeting ISO16750-2 and LV124 ECU immunity requirements while minimizing MOSFET body-diode conduction time and associated power loss.
What is the role of the PG (Power Good) pin on the LT8672IMS#PBF?
The PG pin on the LT8672IMS#PBF is an open-drain output that signals when the external MOSFET is ready to conduct load current. It goes high-impedance only when the auxiliary boost regulator has reached its 11V regulation target, the gate driver is active, and no fast pull-up fault (>17µs) is detected. If LT8672IMS#PBF is in shutdown, AUX is under-regulated, or the FPU path remains active too long, PG pulls low-providing a hardware interlock to prevent premature load connection and protect downstream circuitry.
Can the LT8672IMS#PBF operate without an external MOSFET?
No, the LT8672IMS#PBF cannot operate without an external N-channel MOSFET. It is a controller-only IC whose GATE pin drives the MOSFET gate, while SOURCE and DRAIN pins sense the MOSFET's source and drain voltages to regulate conduction. The LT8672IMS#PBF contains no power-switching elements; all load current flows through the external MOSFET. Selecting an appropriate MOSFET-with RDS(ON) < 60mΩ at 5A, BVDSS > 42V, and QGTOT optimized for 100kHz operation-is mandatory for proper LT8672IMS#PBF functionality.
What packaging and thermal characteristics define the LT8672IMS#PBF?
The LT8672IMS#PBF uses a 10-lead plastic MSOP package (3mm × 3mm, 0.5mm pitch) rated for –40°C to 125°C junction temperature, with θJA = 160°C/W. Unlike DFN variants, the MSOP version lacks an exposed pad. Thermal design must prioritize low-inductance grounding (Pin 4), local 4.7µF+ bypassing at DRAIN (Pin 8), and minimal trace length between GATE (Pin 10) and the MOSFET gate. The LT8672IMS#PBF's 20µA quiescent current and 20mV regulation minimize self-heating, allowing compact placement near high-current paths without forced airflow.
LT8672IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- -
- Channel Type:
- Single
- Number of Drivers:
- 1
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 3V ~ 42V
- Logic Voltage - VIL, VIH:
- -
- Current - Peak Output (Source, Sink):
- -
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT8672IMS#PBF FAQ
1.How can I place an order for LT8672IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8672IMS#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 LT8672IMS#PBF reliable?
The price and inventory of LT8672IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8672IMS#PBF is usually 5 days.
3.What payment methods are accepted for LT8672IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8672IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8672IMS#PBF?
LT8672IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8672IMS#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 LT8672IMS#PBF?
For technical support, including LT8672IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8672IMS#PBF requirements.
6.How does Aetrix verify that LT8672IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LT8672IMS#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 LT8672IMS#PBF meets industry standards.
7.What is the process for return or replacement of LT8672IMS#PBF?
All LT8672IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8672IMS#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 LT8672IMS#PBF part is unused and in its original packaging.
Return procedure for LT8672IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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