feature

• Logic level inputs

• Compatible with 3V microcontrollers

• ESD protection

• Auto restart thermal shutdown

• Overload protection

•Short circuit protection

• Overvoltage protection

• On load detection (during off)

• Current limit

• Direct parallel control of inputs

• Freeze multiplexing function

• General fault flags

• Very low standby quiescent current

• Switching frequency up to 50kHz

application

• Various resistive, inductive and capacitive loads in switching applications

• Compatible power switches for 12 V, 24 V and 42 V applications

• Replaces electromechanical relays and discrete circuits

• Line, stepper motor, lamp and relay drivers

General Instructions

The BTS3408G is a dual low side switch with D-MOS output stage for driving resistive, capacitive and inductive loads. The design is based on Infineons Smart Power Technology (SPT), which allows bipolar, CMOS and power D-MOS devices to operate on the same monolithic circuit.

The BTS3408RS is protected by embedded protection features and is designed for automotive and industrial applications. It is especially suitable for driving stepper motors and lines.

Circuit Description

logic power

This logic is powered by 4.5 to 60 volts from the VS pin. If VS falls below the maximum 4.5 volts, the logic turns off and the output stage turns off.

direct input

ENA

The ENA/FREEZE input can be used to enable and/or freeze the output control of the IC or to shut down the entire IC.

By pulling the ENA input low, i.e. applying a voltage, the IC is in disable mode. The power stage is turned off and the current consumption is reduced to (stby).

By applying the voltage VENAFZ, the integrated circuit is in freeze mode. The output signal will remain in its original state. All input signals will be ignored.

By pulling the input high, the IC is in enable mode. All input signals are output.

ENA-pin has an internal pull-down.

1/2

Each output is independently controlled via its respective input pin. Input pins are active high. Each input signal is output if the common enable pin is high. The input pins have an internal pull-down.

power stage

Each output has embedded protection. In the event of an overload or short circuit to the power supply, the current is limited internally. The current limit is set to ID(lim). If this operation results in excessive temperature, a second protection level (about 165 °C) will put the affected output into PWM mode (selective thermal shutdown on restart) to prevent critical chip temperatures. The temperature lag is typically 10 kilometers.

Zener clamps are used to limit the voltage of the power transistors when the inductive load is turned off.

diagnostic

The general fault pin is an open-drain output. The fault pin is active low. It indicates the fault status of either of the two output stages. By doing so, single-fault and/or double-failure conditions can be monitored. A single fault condition can be specified.

fault distinction

Open load/short-to-ground is recognized in the disconnected state. Overheating due to overload or short-circuit to the battery can only occur in the switched-on state. If there is only one fault at a time, it is possible to distinguish which channel is affected by which fault.

Electromagnetic Compatibility Characteristics

The following EMC characteristics outline the behavior of typical equipment. They are not part of any production tests.

conducted emissions

According to IEC 61967-4 (1Ω/150Ω method)

conduction sensitivity

According to I47A/658/CD IEC 62132-4 (Direct Power Injection)

Direct Power Injection: Forward Power CW

Failure criteria: 10% change in maximum amplitude or frequency

Timing diagram

Type of packaging

Package outlines for pipes, trays, etc. are included in the data sheet "Package Information" SMD = Surface Mount Device Dimensions (mm).

caution!

The information provided here is used to describe certain parts and should not be considered guaranteed characteristics.

Terms of delivery and technical changes are reserved.

We hereby disclaim any and all warranties, including without limitation warranties of non-infringement, with respect to the circuits, descriptions and diagrams stated here.

Infineon Technologies is a certified manufacturer of electronics in China.

Inquiry

For more information on technology, delivery terms, conditions and prices, please contact your nearest Infineon Technical Office in Germany or our Infineon Technologies worldwide representative (see address list).

warn

Due to technical requirements, components may contain hazardous substances. For these types of information, please contact the nearest Infineon Technical Office.

Components of Infineon Technology may only be used in life support devices or systems with the express written approval of Infineon Technology, provided that failure of such components can reasonably be expected to cause failure of, or affect The safety or effectiveness of the device or system. Life support devices or systems are often implanted into the human body, or to support and/or maintain and/or maintain and/or protect human life. If it fails, it is reasonable to assume that the health of the user or others may be at risk.