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TDA3681TH Folha de dados(PDF) 2 Page - NXP Semiconductors |
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TDA3681TH Folha de dados(HTML) 2 Page - NXP Semiconductors |
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2 / 28 page  2002 Apr 10 2 Philips Semiconductors Product specification Multiple voltage regulator with switch and ignition buffer TDA3681 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 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 (regulators 1, 3 and 4 and power switch off) • Hold output when one of regulators 1 and 3 and/or 4 is out of regulation • Hold output for foldback mode of power switch and regulators 1, 3 and 4 • Hold output for 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). GENERAL DESCRIPTION The TDA3681 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 TDA3681 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. ORDERING INFORMATION TYPE NUMBER PACKAGE 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 (lead length 12 mm) SOT475-1 TDA3681TH HSOP20 plastic, heatsink small outline package; 20 leads; low stand-off height SOT418-2 |
Nº de peça semelhante - TDA3681TH |
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Descrição semelhante - TDA3681TH |
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