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Analog Devices Inc. LT8672HDDB#TRPBF
- Part No.:
- LT8672HDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8672HDDB#TRPBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,040
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Product details
Overview
LT8672HDDB#TRPBF 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 –40V reverse input tolerance-enabling cold-crank operation down to 3.2V in 12V automotive ECUs.
For engineers reviewing the LT8672HDDB#TRPBF datasheet, LT8672HDDB#TRPBF pinout, LT8672HDDB#TRPBF application, or LT8672HDDB#TRPBF equivalent, key selection considerations include ultrafast transient response (≤1.1µs turn-off), integrated auxiliary boost regulator (11V above DRAIN), power-good signaling, shutdown quiescent current ≤3.5µA, and compatibility with 100kHz/2VP-P AC ripple rectification.
Technical Context
The LT8672HDDB#TRPBF implements a dual-loop control architecture: a precision 20mV SOURCE–DRAIN regulation loop for steady-state conduction and independent fast pull-up/pull-down comparators (75mV threshold, ≤1.1µs delay) for sub-microsecond response to AC ripple transients up to 100kHz. Its integrated auxiliary boost regulator delivers regulated 11V gate drive referenced to DRAIN using a hysteretic 100mA current-limited switch.
It features bidirectional protection: SOURCE and EN/UVLO pins withstand –40V reverse transients; GATE is actively pulled to SOURCE during negative events to disable the external MOSFET; PG pin provides open-drain fault signaling for startup, AUX regulation failure, or prolonged fast-pull-up activation (>17µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Regulation Voltage | 20mV - Enables cold-crank operation at VBATT ≥3.2V without requiring buck-boost regulators. |
| Operating Voltage Range | 3V to 42V - Supports full automotive supply range including load dump (42V) and cold crank (3.2V). |
| Reverse Input Tolerance | –40V on SOURCE/EN/UVLO - Survives reverse battery connection and protects downstream circuitry. |
| Quiescent Current | 20µA typical in operation; 3.5µA in shutdown - Minimizes standby power loss in always-on vehicle modules. |
| AC Ripple Rectification | Up to 100kHz at 2VP-P - Meets ISO16750/LV124 ECU ripple immunity requirements without body-diode conduction. |
| AUX Boost Output | 11V above DRAIN - Ensures full enhancement of logic-level N-MOSFETs across entire input range. |
| Enable Threshold | 1.21V with 70mV hysteresis - Provides robust undervoltage lockout with noise immunity for automotive environments. |
Pinout & Package
LT8672HDDB#TRPBF uses a 10-lead 3mm × 2mm plastic DFN package with exposed pad (Pin 11), rated for –40°C to 150°C junction temperature and qualified per AEC-Q100 Grade H.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable and undervoltage lockout input | Shuts down controller and boost regulator when <1.21V; ties to DRAIN if unused. |
| GND (2) | No-function ground | Must be connected to system ground but carries no internal current path. |
| PG (3) | Open-drain power-good output | Pulls low during shutdown, AUX under-regulation, or >17µs fast-pull-up activation-signals MOSFET readiness. |
| GND (4) | Main internal ground reference | Primary ground return for all internal circuitry; tie directly to local GND plane. |
| NC (5) | No-connect terminal | Internally unconnected; may be grounded or left floating. |
| AUXSW (6) | Auxiliary boost regulator switch node | Drives external boost inductor; requires minimal PCB trace area for low EMI. |
| AUX (7) | Auxiliary boost output | Provides 11V gate drive above DRAIN; bypass with 1µF capacitor to DRAIN only. |
| DRAIN (8) | Input voltage sense and supply | Senses VBATT for regulation; powers internal circuitry; bypass with ≥4.7µF locally. |
| SOURCE (9) | MOSFET source sense and return | Sense node for SOURCE–DRAIN regulation; protected to –40V; no bypass cap >60nF allowed. |
| GATE (10) | External MOSFET gate driver output | Delivers ±300mA peak drive; regulates VGS to maintain 20mV forward drop. |
Key Features
| Feature | Design Value |
|---|---|
| 20mV forward regulation | Reduces minimum input voltage requirement by >300mV vs. Schottky diodes-enables use of simpler buck regulators during cold crank. |
| Integrated 11V auxiliary boost | Eliminates need for external charge pump or bias supply-ensures full MOSFET enhancement even at 3V input. |
| 100kHz ripple rectification capability | Supports LV124 E-13 and ISO16750-2 test profiles without MOSFET body-diode conduction or thermal derating. |
| –40V reverse input tolerance | Withstands reverse battery connection without external TVS-reduces BOM count and PCB area in front-end protection. |
| 3.5µA shutdown current | Meets automotive "parking mode" current budgets (<10µA) when paired with low-leakage external MOSFET. |
Applications
| Automotive Battery Protection | Industrial Power Input Protection |
|---|---|
Use Scenario: 12V ECU subjected to reverse battery connection, load dump (42V), and cold crank (3.2V) per ISO16750-2. IC Role / Device Role / Timing Role: Active rectifier controller replacing Schottky diode in high-side reverse polarity protection path. Use Value: Eliminates 300–500mV diode drop, enabling direct buck regulation at 3.2V input and reducing thermal stress on PCB. |
Use Scenario: 24V industrial PLC I/O module requiring reverse input protection and immunity to 50kHz conducted noise. IC Role / Device Role / Timing Role: Controls external N-MOSFET as ideal diode in DC input stage with fast transient suppression. Use Value: Reduces power dissipation by >90% vs. Schottky solution-enables fanless enclosure design and extended MTBF. |
| Automotive ECU Ripple Suppression | Portable Test Equipment Power Path |
Use Scenario: Automotive ADAS camera ECU exposed to 6VP-P, 30kHz ripple per LV124 E-13. IC Role / Device Role / Timing Role: Rectifies AC ripple superimposed on 12V supply using fast pull-up/pull-down comparators. Use Value: Limits reverse current conduction to <10ns per half-cycle-prevents MOSFET overheating and maintains output capacitance life. |
Use Scenario: Handheld multimeter powered from USB or CR123 battery with automatic source selection and reverse protection. IC Role / Device Role / Timing Role: Controls back-to-back MOSFETs (with external logic) for seamless source handover and polarity blocking. Use Value: Achieves <20µA total system quiescent current in battery mode-extends runtime beyond 200 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active rectifier controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM74610-Q1 | Uses external N-FET with 15mV regulation; no integrated boost-requires separate 12V bias rail. | Lacks auxiliary boost regulator; unsuitable for 3V–5V input systems without auxiliary supply. | Prefer when bias rail is available and lower forward drop (15mV) is critical; not drop-in for LT8672HDDB#TRPBF layouts. |
| TPS43060 | Integrated 42V synchronous rectifier controller with 30mV regulation; no reverse voltage tolerance on SOURCE. | Rated only to –12V reverse input; requires external TVS for automotive reverse-battery protection. | Select for cost-sensitive non-automotive applications where –40V tolerance is unnecessary; different pinout and layout. |
Compared with LM74610-Q1 and TPS43060, the LT8672HDDB#TRPBF uniquely integrates a DRAIN-referenced 11V boost regulator and –40V reverse tolerance on SOURCE/EN pins-enabling single-chip reverse protection and ripple rectification across the full 3V–42V automotive range without auxiliary supplies or external clamping.
Availability
LT8672HDDB#TRPBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial power input protection, automotive ECU ripple suppression, and portable test equipment power path applications requiring stable component supply and AEC-Q100 compliance.
Supply support for LT8672HDDB#TRPBF 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 with reliability-engineered components.
The LT8672 product line is designed specifically for automotive-grade active rectification-delivering ultra-low-drop, high-speed reverse protection and AC ripple rectification in harsh ECU environments.
FAQ
What is the maximum AC ripple frequency the LT8672HDDB#TRPBF can rectify?
The LT8672HDDB#TRPBF supports rectification of up to 100kHz AC ripple at 2VP-P amplitude and 50kHz at 6VP-P amplitude, as verified in the datasheet's Typical Performance Characteristics (Figure G09, G14). This capability meets ISO16750-2 and LV124 E-13 automotive ripple immunity requirements. The fast pull-up/pull-down comparators enable sub-microsecond MOSFET switching, minimizing body-diode conduction time and associated power loss during high-frequency ripple events. The LT8672HDDB#TRPBF achieves this without external compensation or loop tuning.
Does the LT8672HDDB#TRPBF require an external gate driver?
No, the LT8672HDDB#TRPBF integrates a high-current gate driver capable of ±300mA peak sink/source, eliminating the need for an external driver. It directly controls standard and logic-level N-channel MOSFETs with gate thresholds from 1V to 3V across its full 3V–42V input range. The driver's 10.2–11.8V regulated output (referenced to DRAIN) ensures full enhancement even at low input voltages. The LT8672HDDB#TRPBF's gate drive timing-1.7µs turn-on and 0.6µs turn-off delays-is optimized for fast ripple rectification without external components.
How does the LT8672HDDB#TRPBF handle reverse battery conditions?
The LT8672HDDB#TRPBF withstands –40V on SOURCE and EN/UVLO pins and actively protects the system by pulling GATE to SOURCE when SOURCE goes negative-turning off the external MOSFET and isolating DRAIN from the reverse source. Unlike passive solutions, it requires no external TVS diodes for basic reverse-battery survival. During reverse events, the IC enters shutdown with ≤3.5µA quiescent current. The LT8672HDDB#TRPBF's reverse tolerance is specified and tested per AEC-Q100 stress conditions, making it suitable for direct integration into automotive front-end protection circuits.
What is the purpose of the PG (Power Good) pin on the LT8672HDDB#TRPBF?
The PG pin on the LT8672HDDB#TRPBF is an open-drain output that signals MOSFET readiness: it goes high-impedance when the external FET is fully controlled and no faults exist. It pulls low during shutdown, if AUX voltage fails to regulate during startup, or if the fast pull-up path remains active >17µs-indicating potential overcurrent or instability. Designers use PG to enable downstream loads only after safe gate drive is established, preventing inrush or overload. The LT8672HDDB#TRPBF's PG behavior is internally monitored and requires no external configuration.
Can the LT8672HDDB#TRPBF operate without the auxiliary boost regulator enabled?
No-the auxiliary boost regulator is integral to LT8672HDDB#TRPBF operation and cannot be disabled. It generates the 11V gate drive referenced to DRAIN, which is essential for fully enhancing logic-level N-MOSFETs across the entire 3V–42V input range. The boost circuit automatically shuts down when AUX reaches regulation, minimizing quiescent current. Attempting to bypass or disable AUX will prevent proper gate drive and cause the LT8672HDDB#TRPBF to fail functional operation. All recommended layouts and applications assume active AUX regulation.
LT8672HDDB#TRPBF 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x2)
LT8672HDDB#TRPBF FAQ
1.How can I place an order for LT8672HDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8672HDDB#TRPBF 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 LT8672HDDB#TRPBF reliable?
The price and inventory of LT8672HDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8672HDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8672HDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8672HDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8672HDDB#TRPBF?
LT8672HDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8672HDDB#TRPBF 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 LT8672HDDB#TRPBF?
For technical support, including LT8672HDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8672HDDB#TRPBF requirements.
6.How does Aetrix verify that LT8672HDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8672HDDB#TRPBF 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 LT8672HDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8672HDDB#TRPBF?
All LT8672HDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8672HDDB#TRPBF, 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 LT8672HDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT8672HDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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