INTEGRATED CIRCUITS DATA SHEET TDA3681 Multiple voltage regulator with switch and ignition buffer Product specication 2004 Mar 31 Supersedes data of 2002 Apr 10Philips Semiconductors Product specication Multiple voltage regulator with switch and TDA3681 ignition buffer FEATURES ESD protection on all pins Thermal protections General Load dump protection Extremely low noise behaviour and good stability with Foldback current limit protection for regulators 1, 2, 3 very small output capacitors and 4 Second supply pin for regulators 3 and 4 to reduce Delayed second current limit protection for the power power dissipation (e.g. via a DC-to-DC converter) switch (at short-circuit) Three V -state controlled regulators (regulators 1, 3 P The regulator outputs and the power switch are and 4) and a power switch DC short-circuit safe to ground and supply (V ). P Regulator 2, reset and ignition buffer operational during load dump and thermal shutdown GENERAL DESCRIPTION Combined control pin for switching regulators 1 and 3 Separate control pins for switching regulator 4 and the The TDA3681 is a multiple output voltage regulator with a power switch power switch and an ignition buffer. It is intended for use in car radios with or without a microcontroller. The TDA3681 Supply voltage range from - 18 to +50 V contains the following: Low quiescent current in standby mode (when Four fixed voltage regulators with a foldback current regulators 1, 3 and 4 and power switch are switched off protection (regulators 1, 2, 3 and 4). Regulator 2, which and ignition input is low) is intended to supply a microcontroller, also operates Hold output (open-collector output stage) for low V P during load dump and thermal shutdown (regulators 1, 3 and 4 and power switch off) Regulators 3 and 4 have a second supply pin that can Hold output when one of regulators 1 and 3 and/or 4 is be connected to a lower supply voltage (>6.5 V) to out of regulation reduce the power dissipation Hold output for foldback mode of power switch and A power switch with protection, operated by a control regulators 1, 3 and 4 input Hold output for load dump and temperature protection Reset and hold outputs that can be used to interface Reset (push-pull output stage) for regulator 2 with the microcontroller the reset signal can be used to call up the microcontroller Adjustable reset delay time Both supply pins can withstand load dump pulses and High supply voltage ripple rejection negative supply voltages Backup capacitor for regulator 2 Regulator 2, which is in regulation at a backup voltage One independent ignition buffer (active HIGH). above 6.5 V A provision for the use of a reserve supply capacitor that Protections will hold enough energy for regulator 2 (5 V continuous) Reverse polarity safe (down to - 18 V without high to allow a microcontroller to prepare for loss of voltage reverse current) An ignition input Schmitt trigger with push-pull output Able to withstand voltages up to 18 V at the outputs stage. (supply line may be short-circuited) ORDERING INFORMATION PACKAGE TYPE NUMBER NAME DESCRIPTION VERSION TDA3681J DBS17P plastic DIL-bent-SIL power package 17 leads (lead length 7.7 mm) SOT243-3 TDA3681JR DBS17P plastic DIL-bent-SIL (special bent) power package 17 leads SOT475-1 (lead length 12 mm) TDA3681TH HSOP20 plastic, heatsink small outline package 20 leads low stand-off height SOT418-3 2004 Mar 31 2