S-19243H12A-A8T1U datasheet(29/74 Pages) ABLIC | AUTOMOTIVE, 125째C OPERATION, 10 V INPUT, 500 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION

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S-19243H12A-A8T1U Datasheet(PDF) 29 Page - ABLIC Inc.

Part #	S-19243H12A-A8T1U

Description	AUTOMOTIVE, 125째C OPERATION, 10 V INPUT, 500 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION

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Manufacturer	ABLIC [ABLIC Inc.]

Direct Link	https://www.ablic.com

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AUTOMOTIVE, 125°C OPERATION, 10 V INPUT, 500 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION

Rev.3.2_00

S-19243xxxA Series

29

4. Discharge shunt function (S-19243xxxA Series A / B / E / F type)

The S-19243xxxA Series A / B / E / F type has a built-in discharge shunt circuit to discharge the output capacitance.

The output capacitance is discharged as follows so that the VOUT pin reaches the VSS level.

(1) The ON / OFF pin is set to OFF level.

(2) The output transistor is turned off.

(3) The discharge shunt circuit is turned on.

(4) The output capacitor discharges.

Since the S-19243xxxA Series C / D / G / H type does not have a discharge shunt circuit, the VOUT pin is set to the

VSS level through several hundred k

Ω internal divided resistors between the VOUT pin and the VSS pin. The

S-19243xxxA Series A / B / E / F type allows the VOUT pin to reach the VSS level rapidly due to the discharge shunt

circuit.

Output transistor: OFF

ON / OFF pin: OFF

VIN

ON / OFF

VSS

ON / OFF circuit

Discharge shunt circuit

: ON

VOUT

*1

*1. Parasitic diode

Current flow

GND

*1

S-19243xxxA Series

Output

capacitor

(CL)

Figure 32

5. Pull-down resistor (S-19243xxxA Series A / C / E / G type)

The ON / OFF pin is internally pulled down to the VSS pin in the floating status, so the VOUT pin is set to the VSS

level.

Note that the IC's current consumption increases as much as current flows into the pull-down resistor of

4.0 M

Ω typ. when the ON / OFF pin is connected to the VIN pin.

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