L78LR05 Просмотр технического описания (PDF) - SANYO -> Panasonic

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L78LR05

150mA, 5V 5-Pin Voltage Regulator with Reset Function

SANYO -> Panasonic 

Sample Application Circuit 1

L78LR05

Note 1 : When the capacitance of Cd is large, the capacitor may not discharge completely, causing td to be made shorter than a set value. If this is a

problem, either connect a high speed diode (DS442) between pin2 (anode side) and pin5 (cathode side) or ensure an adequate discharge time by

using values for capacitors Cin and Cd such that Cin>Cd.

Note 2 : If a pull-up resistor is connected to the reset output pin externally, it is possible to cause a sink current up to 4mA to flow.

Reset Operation

Sample Application Circuit 2 (Direct battery backup)

Since the leakage current at the output pin (pin5) of the L78LR05 is so low as 2μA or less, a backup circuit can be

implemented by connectiong an electric double layer capacitor (super capacitor : NEC, gold capacitor : Matsushita Elec-

tric) or a Ni Cd battery direct to the output pin. Since a reverse blocking diode, which has been so far connected to the

output pin, is not required, a regulated power-supply voltage can be supplied to a load during the steady-state operation,

without voltage drop caused by the diode and effects of temperature characteristics, current characteristics of the diode. No

battery-regulator switching circuit is required at the battery backup start mode.

Note 3 : The capacitance of reset output signal delay capacitor Cd must exceed that of input capacitor Cin. If the capacitance of Cd is small, a reset pulse

signal may be generated once when the main power source is turned off (at the battery backup start mode).

No.2622–3/6

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