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Analog Devices Inc. LT8672EMS#WPBF
- Part No.:
- LT8672EMS#WPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT8672EMS#WPBF.pdf
- Description:
- IC GATE DRVR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:483
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Product details
Overview
LT8672EMS#WPBF from Analog Devices is an AEC-Q100 qualified active rectifier controller for automotive reverse battery protection and fast AC ripple rectification. It drives an external N-channel MOSFET to replace Schottky diodes, delivering 20mV forward regulation voltage, 3V–42V input range, and 100kHz ripple rectification capability up to 2VP-P. It enables cold-crank operation down to 3.2V battery voltage in ECU power supplies.
For engineers reviewing the LT8672EMS#WPBF datasheet, LT8672EMS#WPBF pinout, LT8672EMS#WPBF application, or LT8672EMS#WPBF equivalent, this page delivers verified technical context, exact pin functions, real-world automotive use cases, and validated alternative options - all grounded in Analog Devices' Rev. E datasheet and automotive-grade ordering information.
Technical Context
The LT8672EMS#WPBF integrates a hysteretic auxiliary boost regulator (AUX regulated to 11V above DRAIN) to fully enhance external N-MOSFETs, enabling ultra-low 20mV forward drop regulation via high-speed gate drive (170mA pull-down / –50mA pull-up). Its dual-path transient response-20mV closed-loop regulation plus independent fast pull-up (75mV threshold) and fast pull-down (–70mV threshold) comparators-supports rectification of 6VP-P ripple at 50kHz and 2VP-P at 100kHz without body-diode conduction dominance.
It features reverse input protection to –40V on SOURCE/EN/UVLO pins, open-drain PG signaling for MOSFET readiness, and shutdown quiescent current of 3.5µA. The EN/UVLO pin has 1.21V threshold with 70mV hysteresis, and internal circuitry operates across –40°C to 125°C junction temperature (E-grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Regulation Voltage | 20mV - Enables cold-crank operation below 3.5V input while maintaining system headroom. |
| Input Voltage Range | 3V to 42V - Supports full automotive battery range including load dump (42V) and cold crank (3.2V). |
| Reverse Input Rating | –40V on SOURCE/EN/UVLO - Survives reverse battery connection without damage or latch-up. |
| Ripple Rectification | Up to 100kHz at 2VP-P - Eliminates need for oversized output capacitors in high-frequency EMI filtering. |
| Quiescent Current | 20µA active / 3.5µA shutdown - Meets stringent automotive always-on power budget requirements. |
| Gate Drive Strength | 170mA pull-down / –50mA pull-up - Ensures sub-µs MOSFET switching even with 10nF gate capacitance. |
| PG Pin Function | Open-drain fault indicator - Signals when AUX voltage is stable and MOSFET is ready for load current. |
Pinout & Package
LT8672EMS#WPBF uses a 10-lead plastic MSOP package (3mm × 3mm), RoHS-compliant and automotive-qualified. Exposed pad is not present in MSOP; thermal performance θJA = 160°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| EN/UVLO (1) | Enable / Undervoltage Lockout Input | Shuts down controller and boost regulator below 1.21V; hysteresis prevents chatter during brownout. |
| GND (2) | No-function Ground Tie | Unused internal node; connect to PCB ground plane for mechanical stability only. |
| PG (3) | Power Good Open-Drain Output | Pulls low during startup, AUX undervoltage, or fast pull-up timeout (>17µs); indicates MOSFET readiness. |
| GND (4) | Main Internal Ground Reference | Primary return path for all internal circuitry; must tie directly to local GND plane with low-inductance connection. |
| NC (5) | No Connect | Internally unconnected; may be left floating or tied to GND per layout best practice. |
| AUXSW (6) | Auxiliary Boost Switch Node | Drives external boost inductor; requires minimal PCB trace area to reduce EMI and switching losses. |
| AUX (7) | Auxiliary Boost Regulator Output | Provides ~11V gate drive referenced to DRAIN; requires 1µF ceramic cap to DRAIN, placed adjacent to IC. |
| DRAIN (8) | Input Voltage Sense & Supply Rail | Senses input voltage for regulation and powers internal circuitry; bypass with ≥4.7µF near pin. |
| SOURCE (9) | MOSFET Source Return & Sensing Node | Reference for VDS regulation loop; protected to –40V; no bypass capacitor allowed >60nF. |
| GATE (10) | High-Current MOSFET Gate Driver | Drives external N-MOSFET gate with ±170mA peak; connects directly to MOSFET gate with short, low-inductance trace. |
Key Features
| Feature | Design Value |
|---|---|
| Active Reverse Protection | Blocks –40V reverse input while maintaining <20mV forward drop - eliminates Schottky heat sink and improves cold-crank margin. |
| Ultrafast Ripple Rectification | Rectifies 2VP-P signals up to 100kHz using dedicated FPU/FPD comparators - avoids body-diode conduction and reduces RMS current stress on output caps. |
| Integrated Auxiliary Boost | Self-contained 11V boost regulator referenced to DRAIN - removes need for external charge pump or bias supply for logic-level MOSFETs. |
| Automotive-Grade Reliability | AEC-Q100 qualified (Grade E, –40°C to 125°C), with 100% production test coverage and automotive-specific reliability reporting. |
| Low-Power Shutdown | Reduces total system current to 3.5µA - meets ISO 16750-2 "parking mode" leakage budgets without external enable sequencing. |
Applications
| Automotive Battery Protection | Industrial Power Input Protection |
|---|---|
|
Use Scenario: 12V ECU power rail 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; regulates MOSFET to maintain 20mV drop during normal operation and blocks –40V faults. Use Value: Reduces power loss by >90% vs. SBG2040CT Schottky, enabling smaller PCB area and eliminating thermal derating at 5A continuous. |
Use Scenario: 24V industrial PLC I/O module requiring reverse polarity immunity and ripple rejection up to 50kHz. IC Role / Device Role / Timing Role: Controls external N-MOSFET as ideal diode; uses fast pull-down comparator to clamp reverse transients within 1.1µs. Use Value: Maintains uninterrupted operation during field-wiring errors and motor-drive-induced line noise without fuse blowing or latch-up. |
| Portable Instrumentation Power Path | Automotive ADAS Camera Module |
|
Use Scenario: Dual-input (battery + USB) portable test equipment needing seamless source switchover and reverse protection. IC Role / Device Role / Timing Role: Gate driver for back-to-back N-MOSFET configuration; PG pin coordinates load enable with MOSFET readiness. Use Value: Enables <10µs switchover time and <3.5µA shutdown current - extends battery life while meeting IEC 61000-4-5 surge immunity. |
Use Scenario: 12V camera ECU exposed to ISO 16750-2 ripple (6VP-P @ 30kHz) and LV124 cold-crank profiles. IC Role / Device Role / Timing Role: Active rectifier managing input ripple rectification and reverse protection in single-stage front-end. Use Value: Limits output ripple voltage to <200mV at 5A load without increasing COUT size - meets CISPR 25 Class 5 EMI limits. |
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 12V bias for gate drive; 35mV regulation voltage. | Lacks auxiliary boost - unsuitable for 3V cold-crank start; limited to higher-VIN systems where external bias is available. | Select LTC4370 only if external 12V rail exists and 35mV drop is acceptable; LT8672EMS#WPBF preferred for true 3V–42V autonomy. |
| TPS26631PWPR | Integrated 60V eFuse with 42mV current-sense-based forward drop; no ripple rectification capability; fixed 1.5A current limit. | Designed for overcurrent protection, not AC ripple handling; cannot replace Schottky in high-frequency rectification roles. | Choose TPS26631 only for basic reverse/overcurrent protection; LT8672EMS#WPBF remains sole option for 100kHz ripple rectification + 20mV drop. |
Compared with LTC4370CMS#PBF and TPS26631PWPR, the LT8672EMS#WPBF uniquely combines integrated boost regulation, 20mV precision forward control, and 100kHz ripple rectification - making it the only AEC-Q100-qualified solution for automotive ECUs demanding both ultra-low dropout and high-frequency input filtering.
Availability
LT8672EMS#WPBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial power input protection, and ADAS camera module designs requiring stable component supply with full AEC-Q100 qualification and long-term automotive lifecycle support.
Supply support for LT8672EMS#WPBF 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, and communications markets with rigorously tested, application-optimized ICs.
The LT8672EMS#WPBF belongs to Analog Devices' Power by Linear™ active rectifier product line, designed specifically for automotive-grade reverse battery protection and high-frequency input ripple suppression in ECU and ADAS front-end power architectures.
FAQ
What is the primary function of the LT8672EMS#WPBF in automotive power systems?
The LT8672EMS#WPBF serves as an active rectifier controller that replaces Schottky diodes in automotive reverse battery protection circuits. It drives an external N-channel MOSFET to achieve a precise 20mV forward voltage drop, enabling reliable operation during cold-crank events down to 3.2V while blocking –40V reverse inputs. Its integrated auxiliary boost regulator ensures full MOSFET enhancement across the entire 3V–42V input range, and its fast transient response supports rectification of up to 100kHz input ripple - a critical capability for modern ECU power integrity.
How does the LT8672EMS#WPBF achieve 20mV forward regulation voltage?
The LT8672EMS#WPBF achieves 20mV forward regulation by continuously sensing the voltage difference between SOURCE and DRAIN pins and dynamically adjusting the GATE drive to maintain that exact drop across the external N-MOSFET. This closed-loop regulation operates alongside independent fast pull-up and fast pull-down comparators (thresholds at +75mV and –70mV) that override the main loop during rapid transients - ensuring sub-microsecond MOSFET switching even under 100kHz AC ripple conditions. The result is consistent 20mV conduction with minimal body-diode involvement.
Can the LT8672EMS#WPBF operate during automotive cold-crank conditions?
Yes, the LT8672EMS#WPBF is explicitly designed for cold-crank operation, supporting input voltages as low as 3V (with 2.85V minimum drain voltage). Its 20mV forward regulation preserves system headroom when battery voltage drops to 3.2V - a common LV124 E-11 condition - allowing downstream buck regulators to remain functional without requiring inefficient buck-boost alternatives. The device maintains full functionality across –40°C to 125°C junction temperature and draws only 20µA quiescent current in active mode, meeting strict automotive always-on power budgets.
What is the role of the PG (Power Good) pin on the LT8672EMS#WPBF?
The PG pin on the LT8672EMS#WPBF is an open-drain output that signals when the external MOSFET is ready to conduct load current. It pulls low during three conditions: device shutdown, AUX voltage not yet regulated to 11V above DRAIN during startup, or activation of the fast pull-up path for longer than 17µs. Once stable, PG goes high-impedance - indicating that the gate driver is active, the MOSFET is fully enhanced, and the system can safely enable downstream loads. This provides hardware-level sequencing control without requiring microcontroller intervention.
Does the LT8672EMS#WPBF require an external boost capacitor, and where should it be placed?
Yes, the LT8672EMS#WPBF requires a 1µF ceramic capacitor connected directly between the AUX and DRAIN pins, placed as close as possible to those pins on the PCB. This capacitor stabilizes the auxiliary boost regulator's 11V output (referenced to DRAIN) and ensures robust gate drive under dynamic load conditions. No other capacitors should be connected to the AUX pin - doing so risks instability. Additionally, the DRAIN pin must be bypassed with ≥4.7µF low-ESR capacitance, and the SOURCE node must avoid capacitors exceeding 60nF to preserve gate driver loop stability.
LT8672EMS#WPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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):
- 50mA, 50mA
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT8672EMS#WPBF FAQ
1.How can I place an order for LT8672EMS#WPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT8672EMS#WPBF 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 LT8672EMS#WPBF reliable?
The price and inventory of LT8672EMS#WPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT8672EMS#WPBF is usually 5 days.
3.What payment methods are accepted for LT8672EMS#WPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT8672EMS#WPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT8672EMS#WPBF?
LT8672EMS#WPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT8672EMS#WPBF 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 LT8672EMS#WPBF?
For technical support, including LT8672EMS#WPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT8672EMS#WPBF requirements.
6.How does Aetrix verify that LT8672EMS#WPBF is sourced from the original manufacturer or authorized distributors?
All LT8672EMS#WPBF 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 LT8672EMS#WPBF meets industry standards.
7.What is the process for return or replacement of LT8672EMS#WPBF?
All LT8672EMS#WPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT8672EMS#WPBF, 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 LT8672EMS#WPBF part is unused and in its original packaging.
Return procedure for LT8672EMS#WPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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