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S-19243XXXH Datasheet(PDF) 27 Page - ABLIC Inc.

Part No. S-19243XXXH
Description  AUTOMOTIVE, 105°C OPERATION, 10 V INPUT, 500 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION
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Maker  ABLIC [ABLIC Inc.]
Homepage  https://www.ablic.com
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S-19243XXXH Datasheet(HTML) 27 Page - ABLIC Inc.

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AUTOMOTIVE, 105°C OPERATION, 10 V INPUT, 500 mA VOLTAGE REGULATOR WITH SOFT-START FUNCTION
Rev.3.2_00
S-19243xxxH Series
27
Operation
1. Basic operation
Figure 29 shows the block diagram of the S-19243xxxH Series to describe the basic operation.
The error amplifier compares the feedback voltage (Vfb) whose output voltage (VOUT) is divided by the feedback
resistors (Rs and Rf) with the reference voltage (Vref). The error amplifier controls the output transistor, consequently,
the regulator starts the operation that keeps VOUT constant without the influence of the input voltage (VIN).
VOUT
*1
VSS
VIN
Rs
Rf
Error amplifier
Current
supply
Vref
Vfb
+
Reference voltage
circuit
*1. Parasitic diode
Figure 29
2. Output transistor
In the S-19243xxxH Series, a low on-resistance P-channel MOS FET is used between the VIN pin and the VOUT
pin as the output transistor. In order to keep VOUT constant, the on-resistance of the output transistor varies
appropriately according to the output current (IOUT).
Caution Since a parasitic diode exists between the VIN pin and the VOUT pin due to the structure of the
transistor, the IC may be damaged by a reverse current if VOUT becomes higher than VIN.
Therefore, be sure that VOUT does not exceed VIN
+ 0.3 V.


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