Analog Devices Inc. LT8672JDDBM#WTRPBF

Overview

LT8672JDDBM#WTRPBF 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, −40V reverse input protection, and operation across 3V–42V input range - enabling robust cold-crank performance in 12V automotive ECUs.

For engineers reviewing the LT8672JDDBM#WTRPBF datasheet, LT8672JDDBM#WTRPBF pinout, LT8672JDDBM#WTRPBF application, or LT8672JDDBM#WTRPBF equivalent, key selection criteria include its 20µA operating quiescent current, 3.5µA shutdown current, 100kHz AC ripple rectification capability (2V_P-P), integrated auxiliary boost regulator (11V above DRAIN), and side-wettable 10-lead DFN package for automated optical inspection.

Technical Context

The LT8672JDDBM#WTRPBF implements a dual-loop control architecture: a precision 20mV SOURCE–DRAIN regulation loop for steady-state conduction and ultrafast comparator-based fast pull-up/fast pull-down paths (60–90mV thresholds) for transient response up to 100kHz. Its integrated auxiliary boost regulator uses hysteretic switching with 100mA current-limited low-side switch to generate stable AUX voltage referenced to DRAIN.

Operation includes fault-aware power good (PG) signaling, EN/UVLO with 1.21V threshold and 70mV hysteresis, and full −40°C to +150°C junction temperature support per J-grade qualification. The device withstands −40V on SOURCE/EN pins and features gate drive capable of ±300mA peak current with sub-μs turn-on/turn-off delays.

Key Specifications

Pinout & Package

LT8672JDDBM#WTRPBF uses a 10-lead (3mm × 2mm) side-wettable plastic DFN package with exposed pad (Pin 11). This package supports automated optical inspection (AOI) and improves thermal performance (θ_JA = 76°C/W) versus MSOP.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar active rectifier controller applications.

Compared with LT8672JDDB#WTRPBF, the LT8672JDDBM#WTRPBF adds side-wettable leads for AOI verification without changing electrical behavior; versus MAX5079ATA+T, it delivers superior regulation accuracy, higher frequency capability, and integrated boost - making it the sole option meeting full AEC-Q100 automotive ripple rectification requirements.

Availability

LT8672JDDBM#WTRPBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial power input conditioning, and portable diagnostic equipment requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for LT8672JDDBM#WTRPBF 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 since 1965.

The LT8672 product line delivers AEC-Q100-qualified active rectifier controllers optimized for automotive reverse battery protection and high-frequency input ripple suppression in ECUs, infotainment systems, and ADAS power domains.

FAQ

What is the maximum AC ripple frequency the LT8672JDDBM#WTRPBF can rectify?

The LT8672JDDBM#WTRPBF rectifies up to 100kHz AC input ripple at 2V_P-P amplitude and 50kHz at 6V_P-P, per datasheet Figure 7 and Electrical Characteristics table. This performance meets ISO16750-2 Class IV and LV124 E-12 automotive test standards. The fast pull-up/pull-down comparators and ±300mA gate drive enable this bandwidth without external compensation. LT8672JDDBM#WTRPBF achieves this using dedicated transient paths separate from the 20mV regulation loop.

Does the LT8672JDDBM#WTRPBF require an external boost capacitor?

Yes - the LT8672JDDBM#WTRPBF requires a 1µF ceramic capacitor connected directly between the AUX and DRAIN pins, placed as close as possible to the IC. This capacitor stabilizes the auxiliary boost regulator output and ensures reliable gate drive voltage generation. No other capacitors should be connected to the AUX pin, and the capacitor must be rated for ≥16V. LT8672JDDBM#WTRPBF's internal boost regulator cannot operate without this external component.

What is the purpose of the two GND pins (Pins 2 and 4) on the LT8672JDDBM#WTRPBF?

Pin 2 (GND) is a no-function ground with no internal connection - it serves only mechanical and thermal purposes and should be tied to PCB ground. Pin 4 (GND) is the functional ground reference for all internal circuitry and must be connected directly to the local ground plane with low-inductance routing. Separating these grounds prevents noise coupling into sensitive analog blocks. LT8672JDDBM#WTRPBF's datasheet explicitly states Pin 2 has "no function in the application."

Can the LT8672JDDBM#WTRPBF be used without the PG (Power Good) pin?

Yes - the PG pin is optional. LT8672JDDBM#WTRPBF operates fully without PG connection; it functions as an open-drain output that pulls low during shutdown, AUX undervoltage, or prolonged fast pull-up activation. If not used for load control or fault monitoring, PG may be left unconnected. However, omitting PG forfeits real-time MOSFET readiness feedback - critical for safety-critical automotive loads where undetected gate driver faults could cause system failure. LT8672JDDBM#WTRPBF's PG status remains valid only when DRAIN voltage exceeds 2.85V.

What MOSFET parameters are critical when selecting an external FET for the LT8672JDDBM#WTRPBF?

Critical MOSFET parameters for LT8672JDDBM#WTRPBF include: R_DS(ON) < 60mΩ at V_GS = 11V (to maintain <20mV drop at target current), BVDSS > V_IN(MAX) + V_OUT (for reverse fault tolerance), Q_g < 20nC (for <1µs switching), and V_GS(MAX) ≥ ±15V (to survive boost voltage transients). LT8672JDDBM#WTRPBF drives logic-level and standard-threshold N-MOSFETs; gate leakage must be <5µA to avoid regulation offset. Example compatible part: BUK7Y3R5-40E.