INTEGRATED CIRCUITS DATA SHEET TDA3681A Multiple voltage regulator with switch and ignition buffer Product specication 2003 Aug 29Philips Semiconductors Product specication Multiple voltage regulator with TDA3681A switch and ignition buffer FEATURES Foldback current limit protection for regulators 1, 2, 3 and 4 General Delayed second current limit protection for the power Extremely low noise behaviour and good stability with switch (at short circuit) very small output capacitors The regulator outputs and the power switch are Second supply pin for regulators 3 and 4 to reduce DC short-circuit safe to ground and supply (V ). P power dissipation (e.g. via a DC-to-DC converter) Three V -state controlled regulators (regulators 1, 3 P GENERAL DESCRIPTION and 4) and a power switch The TDA3681A is a multiple output voltage regulator with Regulator 2, reset and ignition buffer operational during a power switch and an ignition buffer. It is intended for use load dump and thermal shutdown in car radios with or without a microcontroller. Combined control pin for switching regulators 1 and 3 The TDA3681A contains the following: Separate control pins for switching regulator 4 and the Four fixed voltage regulators with a foldback current power switch protection (regulators 1, 2, 3 and 4). Regulator 2, which Supply voltage range from - 18 V to +50 V is intended to supply a microcontroller, also operates during load dump and thermal shutdown Low quiescent current in standby mode (when regulators 1, 3 and 4 and power switch are switched off Regulators 3 and 4 have a second supply pin that can and ignition input is low) be connected to a lower supply voltage (> 6.5 V) to reduce the power dissipation Hold output for low V , load dump and temperature P protection A power switch with protection, operated by a control input Reset (push-pull output stage) for regulator 2 and hold output (open-collector output) Reset and hold outputs that can be used to interface with the microcontroller the reset signal can be used to Adjustable reset delay time call up the microcontroller High supply voltage ripple rejection Both supply pins can withstand load dump pulses and Backup capacitor for regulator 2 negative supply voltages One independent ignition buffer (active HIGH). Regulator 2, which is in regulation at a backup voltage above 6.5 V Protections A provision for the use of a reserve supply capacitor that Reverse polarity safe (down to - 18 V without high will hold enough energy for regulator 2 (5 V continuous) reverse current) to allow a microcontroller to prepare for loss of voltage Able to withstand voltages up to 18 V at the outputs An ignition input Schmitt trigger with push-pull output (supply line may be short-circuited) stage. ESD protection on all pins Thermal protections Load dump protection ORDERING INFORMATION PACKAGE TYPE NUMBER NAME DESCRIPTION VERSION TDA3681ATH HSOP20 plastic, heatsink small outline package 20 leads low stand-off height SOT418-3 2003 Aug 29 2