Figure 2 : Quiescent Current vs. Supply Voltage.

Figure 3 : Programmable Output 2 Voltage with External Resistors.

400

µ

200

µ

RESET CIRCUIT

The blockcircuit diagramof thereset circuit is shown

in fig.4. The reset circuit supervisesthe standbyout-

put voltage. The reset threshold of 4.7V is defined

by the internal reference voltage and the standby

output divider.

2

µA

The reactiontime of the reset circuit dependson the

The reaction time of the reset circuit increases the

noise immunity. In fact,if the standbyoutputvoltage

drops below the reset threshold for a time shorter

occurs. The nominal reset delay is generated for

standby output voltage drops longer than the time

necessary for the complete discharging of the ca-

µsif

shown in fig. 5.

L4937NPD

6/9