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Analog Devices Inc. LT8672JDDB#TRPBF
- Part No.:
- LT8672JDDB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LT8672JDDB#TRPBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,965
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Product details
Overview
LT8672JDDB#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 drop, 3V–42V input range, −40V reverse input tolerance, and 100kHz AC ripple rectification capability in a 3mm × 2mm DFN package rated for −40°C to 150°C junction temperature.
For engineers reviewing the LT8672JDDB#TRPBF datasheet, LT8672JDDB#TRPBF pinout, LT8672JDDB#TRPBF application, or LT8672JDDB#TRPBF equivalent, key selection considerations include its 20µA operating quiescent current, 3.5µA shutdown current, integrated auxiliary boost regulator (11V above DRAIN), power good (PG) signaling, and fast pull-up/pull-down gate control for transient response up to 100kHz with 2VP-P ripple.
Technical Context
The LT8672JDDB#TRPBF implements a closed-loop SOURCE–DRAIN voltage regulation architecture that maintains a precise 20mV forward drop across the external MOSFET using high-bandwidth gate drive (300mA pull-down, 50mA pull-up). Its fast pull-up (75mV threshold) and fast pull-down comparators respond within sub-microsecond delays (1.1µs turn-off, 3.1µs turn-on) to transients, enabling true diode-like rectification of high-frequency input ripple without body-diode conduction dominance.
It integrates a hysteretic auxiliary boost regulator (100mA current-limited, 11V AUX–DRAIN regulation) to generate gate drive voltage independent of input level, ensuring full enhancement of logic-level or standard-threshold N-MOSFETs across the full 3V–42V operating range. The PG pin provides open-drain fault indication for startup, AUX regulation failure, or extended FPU activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 3V to 42V input; supports cold-crank down to 3.2V and load-dump survival |
| Reverse Input Protection | Withstands −40V at SOURCE/EN/UVLO pins; isolates load during reverse battery events |
| Forward Regulation Voltage | 20mV typical; reduces minimum system input voltage requirement and thermal stress |
| Quiescent Current | 20µA in operation; enables always-on automotive modules with ultra-low standby loss |
| Shutdown Current | 3.5µA; minimizes battery drain when disabled via EN/UVLO pin |
| AC Ripple Rectification | Up to 100kHz with 2VP-P amplitude; meets ISO16750/LV124 ECU ripple requirements |
| Temperature Grade | J-grade: −40°C to 150°C junction; qualified for under-hood automotive applications |
Pinout & Package
LT8672JDDB#TRPBF is housed in a 10-lead, 3mm × 2mm plastic DFN package with exposed pad (Pin 11), rated θJA = 76°C/W. The package supports side-wettable terminations for automated optical inspection (AOI) and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | Shuts down controller and boost regulator below 1.21V; 70mV hysteresis prevents chatter during brownout |
| GND (2) | No-function Ground | Internal test node; must be connected to PCB ground plane but carries no signal current |
| PG (3) | Power Good Open-Drain Output | Pulls low during shutdown, AUX undervoltage, or >17µs FPU activation; signals MOSFET readiness |
| GND (4) | Main Power Ground | Reference for all internal circuitry; requires low-impedance connection to local GND plane |
| NC (5) | No Connect | Internally unconnected; may be left floating or tied to GND for mechanical stability |
| AUXSW (6) | Auxiliary Boost Switch Node | Drives external boost inductor; must be routed with minimal loop area to reduce EMI |
| AUX (7) | Auxiliary Boost Regulator Output | Provides ~11V above DRAIN to fully enhance external N-MOSFET gate; bypassed with 1µF to DRAIN |
| DRAIN (8) | Input Voltage Sense & Supply | Senses input rail; powers internal circuitry; requires ≥4.7µF local bypass capacitor |
| SOURCE (9) | MOSFET Source Return Path | Reference for SOURCE–DRAIN regulation; protected to −40V; capacitance ≤60nF for stability |
| GATE (10) | High-Current Gate Drive Output | Delivers ±300mA peak drive; controls external N-MOSFET with <1.1µs turn-off delay |
Key Features
| Feature | Design Value |
|---|---|
| Active Reverse Protection | Replaces Schottky diodes with MOSFET-based ideal diode, eliminating 0.3–0.5V forward drop and >90% power loss reduction |
| Integrated Auxiliary Boost | Self-contained 11V boost regulator eliminates need for external charge pump or bias supply for gate drive |
| Ultrafast Transient Response | Sub-microsecond gate timing enables clean rectification of 100kHz/2VP-P ripple without body-diode conduction |
| AEC-Q100 Qualified | J-grade qualification (−40°C to 150°C) ensures reliability in automotive under-hood environments |
| Low Quiescent Power | 20µA operating current and 3.5µA shutdown current support always-on vehicle systems with multi-year battery life |
Applications
| Automotive Battery Protection | Industrial DC Power Inputs |
|---|---|
Use Scenario: 12V/24V automotive ECU subjected to reverse battery connection, load dump (up to 35V), and cold-crank (down to 3.2V). IC Role / Device Role / Timing Role: Active rectifier controller enforcing reverse polarity isolation and maintaining regulated forward conduction path. Use Value: Prevents damage to downstream electronics while sustaining operation during low-voltage cranking-enabling use of efficient buck regulators instead of buck-boost. | Use Scenario: Industrial PLC power module requiring robust input protection against field wiring errors and ESD-induced transients. IC Role / Device Role / Timing Role: High-reliability reverse-input protection controller replacing discrete TVS + diode solutions. Use Value: Eliminates Schottky forward drop and associated thermal derating, allowing higher current density on compact PCBs without heatsinks. |
| Portable Test Equipment | Automotive ADAS Power Rails |
Use Scenario: Battery-powered handheld instrumentation with hot-swap capability and long shelf-life requirements. IC Role / Device Role / Timing Role: Low-quiescent-current reverse protection and input conditioning for Li-ion or lead-acid powered systems. Use Value: 3.5µA shutdown current extends battery life by months; 20mV drop preserves usable voltage headroom for analog front-ends. | Use Scenario: Radar or camera ECU exposed to high-frequency alternator ripple (up to 50kHz, 6VP-P) per ISO16750-2. IC Role / Device Role / Timing Role: Precision active rectifier suppressing ripple-induced noise coupling into sensitive RF/analog circuits. Use Value: Reduces output capacitor RMS current and ripple voltage by >80% versus passive diode solutions, improving power integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar active rectifier controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4370IMS#PBF | Single-channel, dual-MOSFET controller with 35mV regulation, no integrated boost; requires external gate bias | Lacks integrated auxiliary boost and 100kHz ripple capability; suited for lower-frequency, space-constrained designs | Choose LTC4370IMS#PBF only if board space permits external bias generation and ripple frequency ≤30kHz |
| TPS26631RGER | Integrated 42V eFuse with 28mV current-sense-based foldback; no active rectification or ripple handling | Provides overcurrent/overvoltage protection but cannot rectify AC ripple or replace diodes for reverse protection | Select TPS26631RGER when primary need is fault protection-not ideal diode behavior or ripple suppression |
Compared with LTC4370IMS#PBF and TPS26631RGER, the LT8672JDDB#TRPBF uniquely combines integrated boost regulation, 20mV precision forward control, and 100kHz ripple rectification-making it the only option qualified for demanding automotive ECU input conditioning where both reverse protection and high-frequency ripple rejection are required.
Availability
LT8672JDDB#TRPBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial DC power inputs, portable test equipment, and ADAS power rails requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT8672JDDB#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.
The LT8672 product line delivers AEC-Q100-qualified active rectifier controllers designed specifically for automotive reverse battery protection and high-frequency input ripple rectification in engine control units and ADAS systems.
FAQ
What is the maximum AC ripple frequency the LT8672JDDB#TRPBF can rectify?
The LT8672JDDB#TRPBF can rectify AC input ripple up to 100kHz when the amplitude is ≤2VP-P, and up to 50kHz for amplitudes ≤6VP-P. This performance is enabled by its sub-microsecond gate turn-on (3.1µs) and turn-off (1.1µs) delays, fast pull-up/pull-down comparators, and high-current gate driver. These specifications are validated per ISO16750-2 and LV124 automotive test standards. The LT8672JDDB#TRPBF achieves this without relying on the MOSFET's body diode, minimizing reverse recovery losses.
Does the LT8672JDDB#TRPBF require an external gate bias supply?
No, the LT8672JDDB#TRPBF does not require an external gate bias supply. It integrates a hysteretic auxiliary boost regulator that generates a regulated ~11V above the DRAIN voltage at the AUX pin, providing sufficient gate drive to fully enhance standard-threshold and logic-level N-channel MOSFETs across the full 3V–42V input range. This eliminates the need for external charge pumps or bias rails, simplifying layout and reducing BOM count. The LT8672JDDB#TRPBF uses this internal boost to deliver ±300mA gate drive current directly.
How does the LT8672JDDB#TRPBF handle reverse battery conditions?
The LT8672JDDB#TRPBF withstands −40V at the SOURCE and EN/UVLO pins and actively protects the load by pulling the GATE terminal to SOURCE when SOURCE goes negative-turning off the external N-MOSFET and blocking reverse current flow. During reverse battery events, the device remains undamaged and immediately resumes normal operation upon polarity correction. Its −40V rating exceeds automotive reverse-battery test requirements (e.g., ISO16750-2, −14V for 60s), and it is AEC-Q100 J-grade qualified for −40°C to 150°C operation. The LT8672JDDB#TRPBF achieves this without external TVS devices in basic configurations.
What is the purpose of the PG (Power Good) pin on the LT8672JDDB#TRPBF?
The PG pin on the LT8672JDDB#TRPBF is an open-drain output that signals when the external MOSFET is ready to conduct load current. It pulls low during shutdown, if the AUX voltage has not reached regulation during startup, or if the fast pull-up (FPU) path remains active for >17µs-indicating abnormal gate control behavior. PG is valid only when DRAIN voltage exceeds the minimum 2.85V. Designers use PG to enable downstream circuitry only after safe gate drive is established, preventing inrush or overload. The LT8672JDDB#TRPBF's PG function is integral to system-level fault management and sequencing.
Can the LT8672JDDB#TRPBF operate with a 3.3V logic enable signal?
Yes, the LT8672JDDB#TRPBF can be enabled using a 3.3V logic signal applied to the EN/UVLO pin. Its EN/UVLO threshold is 1.21V (typical) with 70mV hysteresis, so a 3.3V signal comfortably exceeds the rising threshold and ensures reliable activation. When disabled, EN/UVLO must be pulled below 1.21V-e.g., via an open-drain driver or resistor divider-to reduce total system current to 3.5µA. The LT8672JDDB#TRPBF also supports direct connection of EN/UVLO to DRAIN for always-on operation, and includes 1nF bypassing guidance to suppress dV/dt coupling.
LT8672JDDB#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)
LT8672JDDB#TRPBF FAQ
1.How can I place an order for LT8672JDDB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8672JDDB#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 LT8672JDDB#TRPBF reliable?
The price and inventory of LT8672JDDB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8672JDDB#TRPBF is usually 5 days.
3.What payment methods are accepted for LT8672JDDB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8672JDDB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8672JDDB#TRPBF?
LT8672JDDB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8672JDDB#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 LT8672JDDB#TRPBF?
For technical support, including LT8672JDDB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8672JDDB#TRPBF requirements.
6.How does Aetrix verify that LT8672JDDB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT8672JDDB#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 LT8672JDDB#TRPBF meets industry standards.
7.What is the process for return or replacement of LT8672JDDB#TRPBF?
All LT8672JDDB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8672JDDB#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 LT8672JDDB#TRPBF part is unused and in its original packaging.
Return procedure for LT8672JDDB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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