Analog Devices Inc. LT8672EMS#TRPBF

Overview

LT8672EMS#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 input range, and ultrafast transient response up to 100kHz (2V_P-P). It enables cold-crank operation down to 3.2V with minimal dropout in 12V automotive ECU power paths.

For engineers reviewing the LT8672EMS#TRPBF datasheet, LT8672EMS#TRPBF pinout, LT8672EMS#TRPBF application, or LT8672EMS#TRPBF equivalent, key selection criteria include reverse input protection to –40V, 20µA operating quiescent current, integrated auxiliary boost regulator (11V above DRAIN), PG status signaling, and MSOP-10 package compatibility with automotive thermal and layout constraints.

Technical Context

The LT8672EMS#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/–60mV thresholds) for sub-microsecond transient response to AC ripple up to 100kHz. Its integrated auxiliary boost regulator uses hysteretic switching with 100mA current limit to generate a stable AUX voltage referenced to DRAIN.

Operation relies on real-time sensing of DRAIN and SOURCE voltages to drive GATE with ±300mA peak current, enabling full enhancement of logic-level or standard-threshold N-MOSFETs. The EN/UVLO pin provides programmable shutdown (3.5µA I_Q) with 1.21V threshold and 70mV hysteresis, while PG asserts open-drain low during startup, fault, or AUX undervoltage conditions.

Key Specifications

Pinout & Package

LT8672EMS#TRPBF is housed in a 10-lead MSOP package (3mm × 3mm, 0.5mm pitch) with exposed pad thermally isolated per JEDEC MO-187. Pin 11 (exposed pad) is not present in MSOP; it applies only to DFN variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC4370CMS#TRPBF and MAX16141ATB+T, LT8672EMS#TRPBF uniquely combines –40V reverse protection, 20mV regulation, integrated DRAIN-referenced boost, and AEC-Q100 Grade E qualification - making it the only option qualified for direct replacement in cold-crank–critical automotive battery protection circuits.

Availability

LT8672EMS#TRPBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial power supplies, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LT8672EMS#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 LT8672EMS#TRPBF belongs to Analog Devices' Power by Linear™ active rectifier product line, designed specifically for high-reliability automotive power conditioning where ultra-low dropout, reverse polarity survival, and ripple rectification are mandatory.

FAQ

What is the minimum input voltage required for LT8672EMS#TRPBF to start up and regulate?

The LT8672EMS#TRPBF requires a minimum DRAIN voltage of 2.85V to initiate internal supply stabilization. Once powered, it regulates SOURCE–DRAIN to 20mV and remains functional down to 3V input. Startup completes within ~7ms after DRAIN exceeds 2.85V, at which point PG goes high-impedance indicating ready state. This behavior enables reliable operation during automotive cold-crank events where battery voltage dips to 3.2V.

Can LT8672EMS#TRPBF drive any N-channel MOSFET, or are there specific gate charge or R_DS(ON) limits?

LT8672EMS#TRPBF supports standard and logic-level N-MOSFETs with V_GS(MAX) ≥ ±15V. Recommended R_DS(ON) is <60mΩ at 10A load to maintain <20mV regulation; total gate charge Q_G should be minimized for optimal 100kHz ripple handling. MOSFETs like BUK7Y3R5-40E (3.5mΩ, 100nC) are validated in Analog Devices' reference designs for LT8672EMS#TRPBF.

How does the PG pin function during startup and fault conditions for LT8672EMS#TRPBF?

The PG pin of LT8672EMS#TRPBF is an open-drain output that pulls low during three conditions: device shutdown (EN/UVLO <1.21V), AUX voltage not yet regulated to 11V above DRAIN, or fast pull-up comparator active for >17µs. PG goes high-impedance only when AUX is regulated and gate driver is stable - providing a hardware-ready signal for downstream load enable. This prevents MOSFET overload during transient events.

Does LT8672EMS#TRPBF require an external capacitor on the SOURCE pin, and what happens if one is added?

LT8672EMS#TRPBF does not require a bypass capacitor on SOURCE and explicitly prohibits >60nF total capacitance at this pin. Adding excess capacitance destabilizes the gate driver's feedback loop, causing oscillation or delayed turn-off. If EMI filtering necessitates a capacitor, it must be ≤60nF and placed as close as possible to the SOURCE pin - verified in Analog Devices' LT8672EMS#TRPBF evaluation board layout guidelines.

Is LT8672EMS#TRPBF pin-compatible with other members of the LT867x family, such as LT8672IMS#TRPBF or LT8672JMS#TRPBF?

Yes, LT8672EMS#TRPBF is pin-compatible with all LT8672xMS variants (IMS, JMS, HMS) in the 10-lead MSOP package. Differences lie solely in guaranteed temperature grade: EMS is rated –40°C to 125°C junction, IMS matches that range with full characterization, while JMS/HMS extend to 150°C. Electrical specifications and pin functions are identical across all grades - allowing drop-in substitution where thermal margin permits.