FOR AUTOMOTIVE HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT 105

°C OPERATION CMOS VOLTAGE REGULATOR

S-19200 Series

Seiko Instruments Inc.

12

3. ON / OFF pin

This pin starts and stops the regulator.

When the ON / OFF pin is set to OFF level, the entire internal circuit stops operating, and the built-in P-channel

MOS FET output transistor between the VIN pin and the VOUT pin is turned off, reducing current consumption

Ω between the VOUT

pin and the VSS pin.

− 0.3 V is applied to the ON / OFF pin.

The ON / OFF pin is configured as shown in Figure 10. Since the ON / OFF pin is neither pulled down nor pulled up

internally, do not use it in the floating status. When not using the ON / OFF pin, connect it to the VSS pin in the

product A type, and connect it to the VIN pin in the B type.

Table 8

Product Type ON / OFF Pin Internal Circuit VOUT Pin Voltage

Current Consumption

A

"L": ON

Operate

Set value

A

"H": OFF

Stop

B

"L": OFF

Stop

B

"H": ON

Operate

Set value

VSS

ON / OFF

VIN

Figure 10

4. Overcurrent protection circuit

The S-19200 Series includes an overcurrent protection circuit having the characteristics shown in "1. Output

voltage vs. Output current (When load current increases) (Ta =

+25°C)" in " Characteristics (Typical Data)",

in order to protect the output transistor against an excessive output current and short circuiting between the VOUT

and the normal value is restored for the output voltage, if releasing a short circuit once.

Caution This overcurrent protection circuit does not work as for thermal protection. If this IC long

keeps short circuiting inside, pay attention to the conditions of input voltage and load

current so that, under the usage conditions including short circuit, the loss of the IC will

not exceed power dissipation of the package.