TDA3681ATH数据手册恩XP中文资料规格书

描述 Description

The TDA3681A is a multiple output voltage regulator with a power switch and an ignition buffer. It is intended for use in car radios with or without a microcontroller. The TDA3681A contains the following:
Four fixed voltage regulators with a foldback current protection (regulators 1, 2, 3 and 4). Regulator 2, which is intended to supply a microcontroller, also operates during load dump and thermal shutdown
Regulators 3 and 4 have a second supply pin that can be connected to a lower supply voltage (> 6.5 V) to reduce the power dissipation
A power switch with protection, operated by a control input
Reset and hold outputs that can be used to interface with the microcontroller; the reset signal can be used to call up the microcontroller
Both supply pins can withstand load dump pulses and negative supply voltages
Regulator 2, which is in regulation at a backup voltage above 6.5 V
A provision for the use of a reserve supply capacitor that will hold enough energy for regulator 2 (5 V continuous) to allow a microcontroller to prepare for loss of voltage
An ignition input Schmitt trigger with push-pull output stage.

特性 Features

General
Extremely low noise behaviour and good stability with very small output capacitors
Second supply pin for regulators 3 and 4 to reduce power dissipation (e.g. via a DC-to-DC converter)
Three VP-state controlled regulators (regulators 1, 3 and 4) and a power switch
Regulator 2, reset and ignition buffer operational during load dump and thermal shutdown
Combined control pin for switching regulators 1 and 3
Separate control pins for switching regulator 4 and the power switch
Supply voltage range from -18 V to +50 V
Low quiescent current in standby mode (when regulators 1, 3 and 4 and power switch are switched off and ignition input is low)
Hold output for low VP, load dump and temperature protection
Reset (push-pull output stage) for regulator 2 and hold output (open-collector output)
Adjustable reset delay time
High supply voltage ripple rejection
Backup capacitor for regulator 2
One independent ignition buffer (active HIGH).
Protections
Reverse polarity safe (down to -18 V without high reverse current)
Able to withstand voltages up to 18 V at the outputs (supply line may be short-circuited)
ESD protection on all pins
Thermal protections
Load dump protection
Foldback current limit protection for regulators 1, 2, 3 and 4
Delayed second current limit protection for the power switch (at short circuit)
The regulator outputs and the power switch are DC short-circuit safe to ground and supply (VP).