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Analog Devices Inc. LT8672IDDB#TRMPBF
- Part No.:
- LT8672IDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8672IDDB#TRMPBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LT8672IDDB#TRMPBF 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 drop, 3V–42V operating range, and 100kHz AC ripple rectification capability in a 10-lead 3mm × 2mm DFN package. Used in 12V automotive ECUs for cold-crank resilience and load-dump survival.
For engineers reviewing the LT8672IDDB#TRMPBF datasheet, LT8672IDDB#TRMPBF pinout, LT8672IDDB#TRMPBF application, or LT8672IDDB#TRMPBF equivalent, key selection criteria include reverse input protection to –40V, ultrafast gate turn-on/turn-off timing (1.7µs/0.6µs), auxiliary boost regulator output (11V above DRAIN), power good signaling, and shutdown quiescent current of 3.5µA.
Technical Context
The LT8672IDDB#TRMPBF implements dual-loop control: a precision 20mV SOURCE–DRAIN regulation loop for steady-state conduction and fast pull-up/pull-down comparators (75mV/–60mV thresholds) for transient response up to 100kHz. Its integrated auxiliary boost regulator delivers 11V above DRAIN to fully enhance logic-level or standard-threshold N-MOSFETs across the full 3V–42V input range.
Operation includes fault-aware power good (PG) monitoring-asserting low during shutdown, AUX under-regulation, or >17µs fast pull-up activation-and EN/UVLO with 1.21V threshold and 70mV hysteresis for programmable undervoltage lockout. The device withstands –40V on SOURCE/EN/UVLO and supports reverse-current blocking without body-diode conduction during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Regulation Voltage | 20mV - Enables cold-crank operation down to ~3.2V input while maintaining system headroom. |
| Operating Voltage Range | 3V to 42V - Covers full automotive battery range including load dump (up to 42V) and cold crank (down to 3V). |
| Reverse Input Protection | –40V on SOURCE/EN/UVLO - Survives reverse battery connection and isolates load without external TVS dependency. |
| AC Ripple Rectification | 2VP-P up to 100kHz - Meets ISO16750/LV124 ECU ripple requirements without MOSFET overheating. |
| Quiescent Current | 20µA in operation, 3.5µA in shutdown - Minimizes parasitic drain on vehicle battery during sleep mode. |
| AUX Boost Output | 11V above DRAIN - Ensures full gate enhancement of N-MOSFETs even at 3V input (AUX ≥ 14V). |
| Gate Drive Timing | Turn-on delay 1.7µs, turn-off delay 0.6µs - Limits reverse recovery energy and enables high-frequency ripple handling. |
Pinout & Package
LT8672IDDB#TRMPBF uses a 10-lead, 3mm × 2mm plastic DFN package with exposed pad (Pin 11), rated for –40°C to 125°C junction temperature. Thermal resistance θJA = 76°C/W, θJC = 13.5°C/W. Exposed pad must be shorted to GND or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable and undervoltage lockout input | Shuts down controller and boost regulator when <1.21V; 70mV hysteresis prevents chatter near threshold. |
| GND (2) | No-function ground tie | Must connect to PCB ground plane but carries no internal current; separate from Pin 4. |
| PG (3) | Open-drain power good flag | Pulls low if shutdown active, AUX not regulated, or fast pull-up active >17µs-enables load enable/disable sequencing. |
| GND (4) | Main internal ground reference | Primary ground return for all internal circuitry; tie directly to local GND plane with low-inductance path. |
| NC (5) | No-connect terminal | Internally unconnected; may be grounded or left floating per layout requirements. |
| AUXSW (6) | Boost regulator switch node | Drives external inductor; requires minimal PCB trace area to reduce EMI and switching losses. |
| AUX (7) | Boost regulator output | Provides gate drive voltage ≥11V above DRAIN; requires 1µF ceramic cap to DRAIN, placed adjacent to IC. |
| DRAIN (8) | Input voltage sense and supply | Senses input rail and powers internal circuitry; bypass with ≥4.7µF capacitor; connect close to MOSFET drain. |
| SOURCE (9) | MOSFET source sensing node | Reference for regulation loop and fast pull-down comparator; must connect close to MOSFET source; max capacitance 60nF. |
| GATE (10) | MOSFET gate driver output | Delivers ±300mA peak drive; regulates VGS to maintain 20mV VSD; connects directly to MOSFET gate. |
Key Features
| Feature | Design Value |
|---|---|
| 20mV forward regulation | Reduces minimum input voltage requirement during cold crank, enabling use of buck (not buck-boost) regulators. |
| Integrated auxiliary boost regulator | Eliminates need for external charge pump or bias supply-provides stable gate drive voltage independent of input level. |
| Power Good (PG) monitoring | Enables safe load enable/disable sequencing by signaling gate readiness and detecting startup faults or overloads. |
| Fast pull-up/pull-down transient response | Rectifies 2VP-P ripple up to 100kHz with minimal reverse conduction-critical for ISO16750-compliant ECUs. |
| AEC-Q100 Grade I qualification | Validated for –40°C to +125°C operation-meets automotive reliability, ESD, and thermal cycling requirements. |
Applications
| Automotive Battery Protection | Industrial Power Supply Input Stage |
|---|---|
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; provides reverse polarity blocking and ultra-low-drop conduction path. Use Value: Eliminates 0.3–0.4V diode drop, reducing power loss by >90% and enabling operation at 3.2V input without buck-boost conversion. | Use Scenario: Industrial 24V DC power distribution unit requiring reverse-input fault tolerance and ripple suppression. IC Role / Device Role / Timing Role: Controls external N-MOSFET as ideal diode in redundant input path or front-end protection stage. Use Value: Withstands –40V reverse transients and rectifies 6VP-P ripple up to 50kHz-reducing output capacitor RMS current and thermal stress. |
| Portable Instrumentation Power Path | Automotive ADAS Camera Module |
Use Scenario: Battery-powered test equipment with dual-input (battery + USB) requiring automatic source selection and reverse protection. IC Role / Device Role / Timing Role: Enables seamless OR-ing between sources while blocking reverse current flow and minimizing voltage loss. Use Value: 20µA quiescent current preserves battery life; 20mV drop maintains accuracy of low-voltage analog signal chains. | Use Scenario: 12V camera module in ADAS system exposed to engine cranking noise and conducted EMI. IC Role / Device Role / Timing Role: Rectifies high-frequency input ripple (up to 100kHz) generated by alternator or DC-DC switching noise. Use Value: Fast 0.6µs turn-off suppresses reverse recovery spikes, lowering conducted emissions and preventing sensor reset events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active rectifier controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4370CMS#PBF | Single-channel, no integrated boost regulator; requires external gate drive supply; 30mV regulation; 40V max input. | Lacks auxiliary boost-unsuitable for low-VIN (<6V) cold-crank scenarios; lower integration increases BOM count. | Select only if input stays >6V and board space allows external bias supply; not drop-in for LT8672IDDB#TRMPBF. |
| TPS2491RGET | Integrated gate driver with 12V boost; 35mV regulation; 60V abs max; no PG pin; non-AEC-Q100. | Higher forward drop reduces cold-crank margin; lacks automotive qualification and power-good signaling for safety-critical loads. | Acceptable for industrial 24V systems where AEC-Q100 and PG are not required; not recommended for automotive ECU deployment. |
Compared with LTC4370CMS#PBF and TPS2491RGET, LT8672IDDB#TRMPBF uniquely combines AEC-Q100 Grade I qualification, integrated 11V boost regulator, 20mV regulation, and PG monitoring-making it the only option qualified for automotive cold-crank and ripple rectification in safety-relevant ECUs.
Availability
LT8672IDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial power supply input stages, and portable instrumentation requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LT8672IDDB#TRMPBF 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 LT8672 product line delivers AEC-Q100-qualified active rectifier controllers optimized for automotive reverse-battery protection, cold-crank resilience, and high-frequency input ripple rectification in ECUs and ADAS modules.
FAQ
What is the primary function of the LT8672IDDB#TRMPBF in an automotive power system?
The LT8672IDDB#TRMPBF functions as an active rectifier controller that replaces Schottky diodes in reverse battery protection circuits. It drives an external N-channel MOSFET to achieve a 20mV forward voltage drop, enabling operation during cold crank (down to 3.2V) and surviving load dump (up to 42V) and reverse battery (–40V). Its integrated auxiliary boost regulator ensures reliable gate drive across the full input range, and its power good (PG) pin signals MOSFET readiness for safe load engagement. This makes LT8672IDDB#TRMPBF essential for robust, efficient power path management in automotive ECUs.
How does the LT8672IDDB#TRMPBF handle high-frequency input ripple in automotive applications?
The LT8672IDDB#TRMPBF handles high-frequency input ripple using dual-path gate control: a precision 20mV regulation loop for steady-state conduction and fast pull-up/pull-down comparators with 75mV/–60mV thresholds for transient response. This architecture enables rectification of 2VP-P ripple up to 100kHz-meeting ISO16750 and LV124 ECU requirements. Gate turn-on delay is 1.7µs and turn-off delay is 0.6µs, minimizing reverse conduction time and associated power loss. The LT8672IDDB#TRMPBF's ability to rapidly modulate the external MOSFET eliminates the body-diode conduction period typical of passive diodes, significantly reducing heat generation and conducted EMI during ripple events.
What is the role of the AUX and AUXSW pins on the LT8672IDDB#TRMPBF?
The AUX pin is the regulated output of the internal auxiliary boost regulator, delivering 11V above the DRAIN voltage to ensure full gate enhancement of the external N-MOSFET-even at 3V input (AUX ≥ 14V). The AUXSW pin is the switch node of that same boost regulator, driving the external inductor. A 1µF ceramic capacitor must be placed between AUX and DRAIN, adjacent to the IC, to stabilize the boost output. The LT8672IDDB#TRMPBF's integrated boost eliminates the need for external bias supplies or charge pumps, simplifying design and improving reliability in space-constrained automotive modules.
Can the LT8672IDDB#TRMPBF be used without the EN/UVLO pin connected?
Yes-the LT8672IDDB#TRMPBF can operate with EN/UVLO tied directly to DRAIN, which permanently enables the device and disables the shutdown feature. In this configuration, total quiescent current remains at 20µA (not reduced to 3.5µA), and the power good (PG) pin operates normally. If programmable undervoltage lockout is needed, a resistive divider from SOURCE to EN/UVLO sets the turn-on threshold (e.g., 1.21V × (1 + R1/R2)), with 1nF bypass to GND recommended to suppress noise coupling. The LT8672IDDB#TRMPBF's EN/UVLO pin has only 0.1µA leakage, making high-impedance dividers viable without significant error.
What MOSFET parameters are critical when selecting an external FET for the LT8672IDDB#TRMPBF?
Critical MOSFET parameters for LT8672IDDB#TRMPBF include: RDS(ON) ≤ 60mΩ at VGS = 11V (to maintain <20mV drop at target load), BVDSS > 42V (to survive load dump), VGS(TH) < 3V (for reliable turn-on at low input), and Qg as low as possible (to minimize switching losses during ripple rectification). The LT8672IDDB#TRMPBF supports both logic-level and standard-threshold N-MOSFETs; gate drive voltage is regulated to 11V above DRAIN, so VGS(MAX) must exceed this value. Leakage in integrated gate protection must stay below 5µA to avoid offsetting the 20mV regulation loop.
LT8672IDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-DFN (3x2)
LT8672IDDB#TRMPBF FAQ
1.How can I place an order for LT8672IDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8672IDDB#TRMPBF 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 LT8672IDDB#TRMPBF reliable?
The price and inventory of LT8672IDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8672IDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT8672IDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8672IDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8672IDDB#TRMPBF?
LT8672IDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8672IDDB#TRMPBF 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 LT8672IDDB#TRMPBF?
For technical support, including LT8672IDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8672IDDB#TRMPBF requirements.
6.How does Aetrix verify that LT8672IDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT8672IDDB#TRMPBF 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 LT8672IDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT8672IDDB#TRMPBF?
All LT8672IDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8672IDDB#TRMPBF, 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 LT8672IDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LT8672IDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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