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TDA3616SF Arkusz danych(PDF) 5 Page - NXP Semiconductors |
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TDA3616SF Arkusz danych(HTML) 5 Page - NXP Semiconductors |
5 / 20 page 2000 Jan 14 5 Philips Semiconductors Objective specification Multiple voltage regulator with battery detection TDA3616 FUNCTIONAL DESCRIPTION The TDA3616 (see Fig.1) is a voltage regulator intended to supply a microprocessor (e.g. in car radio applications). Because of low-voltage operation of the application, a low-voltage drop regulator is used. This regulator will switch-on when the backup voltage (see Section “Backup circuit”) exceeds 7.5 V for the first time and will switch-off again when the output voltage of the regulator drops below 2.4 V. When the regulator is switched on, the RES1 and RES2 outputs (RES2 can only be HIGH when RES1 is HIGH) will go HIGH after a fixed delay time (fixed by an external delay capacitor) to generate a reset to the microprocessor. Pin RES1 will go HIGH via an internal pull-up resistor of 3.1 k Ω, and is used to initialize the microprocessor. Pin RES2 is used to indicate that the regulator output voltage is within its voltage range. This start-up feature is built-in to secure a smooth start-up of the microprocessor at first connection, without uncontrolled switching of the regulator during the start-up sequence. The charge of the backup capacitor can be used to supply the regulator and logic circuits for a short period of time when the supply falls to 0 V (the time depends on the value of the storage capacitor). The regulator is switched off at a backup voltage of approximately 2.7 V. From this time onwards, the backup charge will only be used for maintaining reset functions. Due to this, the reset outputs will remain LOW until the output of the regulator is dropped to 0 V. All output pins are fully protected. The regulator is protected against load dump and short-circuit (foldback current protection). At load dump, the battery detection circuit will remain operating. Interfacing with the microprocessor can be accomplished by means of a battery Schmitt trigger and output buffer (simple full/semi on/off logic applications). The battery output will go HIGH when the battery input voltage exceeds the high threshold level. The timing diagrams are shown in Fig.4. Fig.4 Timing diagrams. handbook, full pagewidth MGR095 battery output battery input reset 1 reset 2 regulator VBU VP reset delay capacitor 2 V 2 V 4.75 V 18 V 2.4 V 2.05 V 1.95 V |
Podobny numer części - TDA3616SF |
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Podobny opis - TDA3616SF |
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