Datasheet

Smart Low-Side Power Switch
BTS3405G
Overview
Data Sheet 4 Rev. 1.1, 2011-09-01
Protective Functions
• Electrostatic discharge protection (ESD)
• Active clamp over voltage protection
• Thermal shutdown with auto restart
• Short circuit protection
Fault Information
• Thermal shutdown
• Short to Battery and overload
Applications
• Designed for driving Relays in Automotive Applications
• All types of resistive, inductive and capacitive loads
• Suitable for loads with peak currents
• Replaces discrete circuits
Detailed Description
The device is able to switch all kind of resistive, inductive and capacitive loads, limited by
E
AS
and maximum
current capabilities.
The BTS3405G offers ESD protection of each IN Pin in relation to the corresponding Source Pin.
The overtemperature protection prevents the device from overheating due to overload and/or bad cooling
conditions. The temperature information is given by a temperature sensor in each of the two power MOSFET.
During thermal shutdown the device tries to sink an increased input current at the corresponding IN pin to feedback
the fault condition on this channel.
The BTS3405G has a thermal-auto-restart function, the regarding channel will turn on again after the measured
temperature has dropped down for the thermal hysteresis.
The over voltage protection is active during load-dump or inductive turn off conditions. The power MOSFET is
limiting the Drain - Source voltage to the defined clamping voltage. This function is available regardless of the input
pin state, means without voltage on the IN pins.