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TLE4470 Datasheet(PDF) 2 Page - Siemens Semiconductor Group |
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TLE4470 Datasheet(HTML) 2 Page - Siemens Semiconductor Group |
2 / 22 page TLE 4470 Semiconductor Group 2 1998-11-01 TLE 4470 G type (P-DSO-20-6 package). V Q1 is compared to the voltage at pin VA, which is proportional to the output voltage V Q2. A control amplifier drives the base of the series PNP transistor via a buffer. The main output voltage V Q2 is tracked to the accuracy of the stand by output. For the TLE 4470 GS (P-DSO-14-4 package) the output voltage is fixed to 5 V. To save energy e.g. in battery powered body electronic applications, the main regulator can be switched off via the disable input, which causes the current consumption to drop to 180 µA typical. Two additional features of the TLE 4470 are an early warning comparator (can be used e.g. to monitor the supply voltage V I) and reset generator with an adjustable reset delay time. The TLE 4470 G (P-DSO-20-6 package) has in addition an adjustable reset switching threshold. This feature is useful with microprocessors which guarantee a safe operation down to voltages below the internally set reset threshold of 4.65 V typical. Two functions are included in the reset generator, a power on reset and an under-voltage reset. The power on reset feature is necessary for a defined start of the microprocessor when switching on the application. The reset LOW signal is generated for a certain delay time after the output voltage V Q1 of the regulator has surpassed the reset threshold. An external delay capacitor sets the delay time. The under voltage reset circuit supervises the stand-by output voltage. In case V Q1 falls below the reset switching threshold the reset output is set LOW after a short reaction time. The reset LOW signal is generated down to an output voltage V Q1 of 1 V. Pin Configuration (top view) Figure 1 GND GND 10 8 9 7 6 3 5 4 2 120 19 18 17 16 15 14 13 12 11 GND DIS D GND RQ SI AEP02151 SQ GND RADJ GND GND ADJ2 GND Q2 Q2 Q1 Ι Ι 1 2 GND 7 6 3 5 4 2 114 13 12 11 10 9 8 GND GND DIS SI AEP02152 GND D Ι GND GND RQ SQ Q2 Q1 P-DSO-20-6 P-DSO-14-4 |
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