Product News

In the design of passenger vehicle electrical architecture, smart high-side switches have become an absolute mainstream configuration for body electronics (such as lamp control, doors and windows, seats, wipers, etc.), and are even gradually penetrating into the powertrain and chassis domains.

For non-safety critical (Non-safety / ASIL A/B) or multiple redundant channel load control requirements in complete vehicles, Reactor-micro have newly launched the intelligent high-side switch RM74067TQ, targeting scenarios such as body comfort system control, body lighting system, basic power distribution, and relay replacement.

1. Product Overview

RM74067TQ is a 12V/75mΩ/4-channel intelligent high-side switch that integrates multiple protection functions such as overvoltage, overtemperature, current limiting, and short circuit protection. It is widely used in automotive electronics and industrial fields. The product's performance is comparable to international top-tier competitors, providing customers with a highly reliable domestic alternative.

II. Core Parameters

III. Product Performance Features

· Equipped with diagnosis and built-in protection

· Possess the ability to turn on under reverse current conditions

· Temperature limiting function with controllable restart

· Overcurrent protection with intelligent restart control

· Undervoltage shutdown

· Cooperate with external components to achieve overvoltage protection

· Proportional load current detection

· Supports detecting open load in both ON and OFF states

· Equipped with protection/detection functions against grounding and power short circuits

· Passed AEC-Q100 automotive specification certification

Key feature introduction:

1. Open circuit detection timing sequence in OFF state - load disconnected

In the open load diagnosis in the OFF state, a waiting period of TIS(OLOFF)_D must be observed between the falling edge of the input pin (IN) and the detection action of the IS pin to ensure the stability of the internal comparator. The following diagram illustrates the timing sequence of open load detection, during which the load remains disconnected at all times.

2. Detection timing sequence under short-circuit condition

RM74067TQ incorporates a short-circuit current limiting circuit internally. When a short circuit occurs or the overload current rises instantaneously, if the output current exceeds the overload threshold, its internal power MOSFET will immediately shut down. At the onset of a fault, the chip will perform four rapid restarts for recovery. If the short circuit persists after four restarts, the chip will reduce the retry frequency and switch to intermittent restarts. The maximum retry cycle count for the chip is two cycles. When this limit is reached, the chip will completely shut down the output of that channel and enter a locked state.

IV. Product Applications

In the automotive electronics field, RM74067TQ is suitable for use in ECU modules such as body control modules (BCM) and vehicle control units (VCU) for passenger vehicles. It covers the control of small-power motors for seat heating pads, ventilation fans, and seat front/rear/backrest adjustments; the control of window lifting motors (with anti-pinch algorithms), sunroof opening and closing motors; the control of low/high speed gears for front/rear windshield wipers, as well as glass cleaning fluid pumps; the control of turn signals, daytime running lights (DRL), taillights, brake lights; the control of interior ambient lights, dome lights, glove box lights, trunk lights, etc. At the same time, it can replace traditional micro relays to achieve intelligent power distribution for various small-power actuators (such as central locking systems, horns, reversing radar probes).

The following figure illustrates the typical application principle of the RM74067TQ product, which can serve as a reference for practical circuit design.

With the successive launch of products such as RM74067TQ onto the market, targeting the passenger car electric intelligence market, Reactor-mico can provide customers with a comprehensive solution for automotive electric intelligence. Our series of products, including intelligent high-side switches, intelligent low-side switches, high-side MOS pre-drivers, and motor drives, have gained widespread recognition from customers due to our stable delivery capabilities and rigorous quality control.

If you need sample application, product procurement, or technical consultation, please call: 029-88827769/18009231253. Our team will respond promptly and provide you with efficient and reliable solutions.