Dual Low-Drop Voltage Regulator TLE 4470 Features Stand-by output 180 mA 5 V 2% Adjustable reset switching threshold Main output 350 mA tracked to the stand-by output Low quiescent current consumption in standby mode Disable function for main output P-DSO-14-1, -4, -7 Wide operation range: up to 45 V PG-DSO-14 Very low dropout Power-On-Reset circuit sensing the stand-by voltage Early warning comparator for supply undervoltage Output protected against short circuit Wide temperature range: -40 C to 150 C Overtemperature protection Overload protection Green Product (RoHS compliant) AEC Qualified P/PG-DSO-20-1,-6,-7,-9,-14,-1 PG-DSO-20 Functional Description The TLE4470 is a monolithic integrated voltage regulator with two very low-drop outputs, a main output Q2 for loads up to 350 mA and a stand by output Q1 providing a maximum of 180 mA. The device is available in two packages the PG-DSO-14 and PG-DSO-20. It is designed to supply microprocessor systems under the severe conditions of automotive applications and is therefore equipped with additional protection functions against overload, short circuit and overtemperature. Of course the TLE 4470 can also be used in other applications where two stabilized voltages are required. The device operates in the wide junction temperature range of -40 C to 150 C. The stand-by regulator transforms an input voltage V in the range of 5.6 V V 45 V I I to V = 5 V within an accuracy of 2%, whereas the main regulator is adjustable. By Q1,nom Type Package TLE 4470 GS PG-DSO-14 TLE 4470 G PG-DSO-20 Data Sheet 1 Rev. 1.2, 2008-03-20 TLE 4470 use of an external voltage divider the main output voltage can be set to V 5 V for the Q2 TLE 4470 G type (PG-DSO-20 package). V is compared to the voltage at pin ADJ2, Q1 which is proportional to the output voltage V . A control amplifier drives the base of the Q2 series PNP transistor via a buffer. The main output voltage V is tracked to the accuracy of the stand-by output. Q2 For the TLE 4470 GS (PG-DSO-14 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 A typical. Two additional features of the TLE 4470 are an early warning comparator (can be used e.g. to monitor the supply voltage V ) and reset generator with an adjustable reset delay I time. The TLE 4470G (PG-DSO-20 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 signal is kept low for a certain delay time after the output voltage V of the regulator has surpassed the reset Q1 threshold. An external delay capacitor sets this delay time. The under voltage reset circuit supervises the stand-by output voltage. In case V falls below the reset switching Q1 threshold the reset output is set LOW after a short reaction time. The reset LOW signal is generated down to an output voltage V of 1 V. Q1 PG-DSO-20 PG-DSO-14 RADJ120 SI D 114 SI D 2 19 1 DIS 2 13 DIS 3 18 2 GND 3 12 GND GND 4 17 GND GND 4 11 GND GND 5 16 GND GND 5 10 GND GND 6 15 GND RQ 6 9 Q2 GND 7 14 GND SQ 7 8 Q1 RQ 8 13 Q2 AEP02152 SQ 9 12 Q2 Q1 10 11 ADJ2 AEP02151 Figure 1 Pin Configuration (top view) Data Sheet 2 Rev. 1.2, 2008-03-20