LM74670QDGKRQ1
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| Part Number | LM74670QDGKRQ1 |
|---|---|
| Manufacturer |
 Texas Instruments
|
| Description | The LM74670QDGKRQ1 is an automotive-qualified zero-quiescent-current smart diode and ideal diode controller from Texas Instruments. It is designed to drive an external N-channel MOSFET so that the MOSFET operates as a low-loss replacement for a conventional diode in reverse polarity protection, rectification, and automotive power-path applications. The LM74670-Q1 supports an operating input voltage range from approximately 0.48V to 42V. Its high voltage capability makes it particularly suitable for automotive battery-connected systems and other applications where the power input can experience substantial voltage variation. A major advantage of the LM74670QDGKRQ1 is its zero quiescent current (IQ) architecture. The controller is not ground referenced and therefore does not require a conventional ground connection that continuously draws current from the input supply. This characteristic is especially useful in automotive systems where minimizing battery drain during long standby periods is important. The controller drives an external N-channel power MOSFET using an integrated charge-pump gate-drive architecture. The external MOSFET can provide a much lower forward voltage drop than a conventional silicon or Schottky diode, significantly reducing conduction losses in high-current power paths. Unlike integrated power switches, the LM74670QDGKRQ1 allows the designer to select the external MOSFET according to the application's required voltage rating, current capability, RDS(on), package size, and thermal performance. This provides substantial flexibility for both low-current and very high-current power systems. The LM74670-Q1 monitors the voltage across the external MOSFET and controls its gate according to current direction. During normal forward conduction, the controller turns the N-channel MOSFET on to minimize voltage drop and power dissipation. If the input polarity is reversed or reverse current begins to flow, an internal fast-response comparator quickly pulls down the MOSFET gate. Turning the external MOSFET off blocks the reverse current path and provides effective reverse polarity and reverse current protection. This operating principle makes the LM74670QDGKRQ1 particularly attractive as a replacement for traditional series protection diodes. In high-current applications, even a relatively small diode forward voltage can produce substantial power dissipation. Using a low-RDS(on) MOSFET controlled by the LM74670-Q1 can dramatically reduce these conduction losses. The device includes an integrated charge-pump gate driver for the external N-channel MOSFET. Typical gate-source current is approximately 70µA, while the controller also provides fast gate discharge capability when reverse current or reverse polarity is detected. Because the controller floats with respect to the power path rather than requiring a conventional ground reference, it can be positioned in applications where implementing a traditional ground-referenced ideal diode controller would be inconvenient or inefficient. The LM74670-Q1 can also operate with AC input signals up to approximately 300Hz. This capability allows the device to be used with external MOSFETs in half-bridge and full-bridge rectifier architectures, including alternator and other low-frequency AC rectification applications. In these rectifier configurations, conventional Schottky rectifier diodes can be replaced with actively controlled N-channel MOSFETs. The substantially lower conduction voltage of the MOSFET can improve overall conversion efficiency and reduce heat generation, particularly in high-current systems. The device is also suitable for automotive load-dump environments when used with appropriately rated external components and system-level protection. Its 42V peak input capability and automotive qualification make it well suited for vehicle power-distribution and battery-interface electronics. The LM74670-Q1 is AEC-Q100 qualified for automotive applications and is specified for an ambient operating temperature range of -40°C to +125°C. This qualification supports its use in demanding automotive and transportation electronics. Because the load current flows through the external MOSFET rather than through the controller itself, the achievable current capability is primarily determined by the selected MOSFET, PCB layout, thermal design, interconnections, and system operating conditions. This architecture enables very high-current ideal-diode solutions without dissipating the load power inside the controller IC. The LM74670QDGKRQ1 is supplied in an 8-pin VSSOP package, identified by Texas Instruments package code DGK. The package measures approximately 3.0 × 4.9mm and occupies only about 14.7mm2 of PCB area, enabling compact automotive power-path designs. The RQ1 ordering version is supplied in large tape-and-reel packaging with 2500 pieces per reel. The device is suitable for automated SMT assembly and high-volume automotive electronics manufacturing. The combination of 0.48V to 42V operation, zero quiescent current, external N-channel MOSFET control, integrated charge-pump gate drive, reverse current blocking, reverse polarity protection, low-loss ideal diode operation, 300Hz AC capability, and AEC-Q100 automotive qualification makes the LM74670QDGKRQ1 a highly effective alternative to conventional power diodes and Schottky rectifiers. The LM74670QDGKRQ1 is widely used in automotive reverse battery protection, automotive battery inputs, electronic control units, body control modules, infotainment systems, telematics equipment, ADAS electronics, automotive power distribution, alternator rectifiers, half-bridge and full-bridge rectifiers, redundant power supplies, ORing circuits, industrial power inputs, battery-powered equipment, high-current DC power paths, and low-loss ideal diode applications. |
| Product Group | Diode |
| MOQ | 2500 pcs |
| SPQ | 2500 pcs |
| Figure/Case | 8-VSSOP |
| Package | T&R Pack |
 PDF Datasheet | |
| Ship From | Hong Kong |
| Shipment Way | DHL / Fedex / TNT / UPS / Others |
| Delivery Term | Ex-Works |
| Send RFQ | sales@signalhk.com |
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LM74670QDGKRQ1
LM74670QDGKRQ1