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L4901 Datasheet(PDF) 4 Page - STMicroelectronics |
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L4901 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 10 page TEST CIRCUIT APPLICATION INFORMATION In power supplies for µP systems it is necessaryto provide power continuously to avoid loss of infor- mation in memories and in time of day clocks, or to save datawhen the primary supply is removed.The L4901A makes it very easy to supply such equip- ments ; it provides two voltage regulators (both 5 V high precision) with separate inputs plus a reset output for the data save function. CIRCUIT OPERATION (see Figure 1) After switch on Reg. 1 saturates until V01 rises to the nominal value. When the input 2 reaches VIT and the output 1 is higher than VRT the output 2 (V02) switches on and the reset output (VR) also goes high after a pro- grammable time TRD (timing capacitor). V02 and VR are switched togetherat low level when one of the following conditions occurs : - an input overvoltage - an overload on the output 1 (V01 <VRT); - a switch off (VIN <VIT -VITH); and they start again as before when the condition is removed. An overload on output 2 does not switch Reg. 2, and does not influence Reg. 1. The V01 output features : - 5 V internal reference without voltage divider between the output and the error comparator ; - very low drop series regulator element utilizing current mirrors ; permit high output impedance and then very low leakage current error even in power down condi- Figure 1 L4901A 4/10 |
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