S-1721 Seiko Instruments, S-1721 Datasheet - Page 20

• Manufacturer Part Number: S-1721
• Description: SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
• Manufacturer: Seiko Instruments

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SUPER-SMALL PACKAGE 2-CIRCUIT HIGH RIPPLE-REJECTION LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1721 Series
4. Overcurrent protector
5. Pull-down/pull-up resistor (S-1721 Series A, B, C, and D types)
The S-1721 Series has a built-in overcurrent protector having the characteristics shown in (1) Output Voltage vs.
Output Current (Ta = 25°C) in “
against an excessive output current and short circuiting between the VOUT and VSS pin.
The current (I
initial value is restored for the output voltage, if releasing a short circuit once.
Note that the overcurrent protect circuit does not provide a thermal protection function, therefore pay attention to the
conditions of input voltage and load current so that the IC’s loss under the usage conditions, including the short
circuit conditions, does not exceed the package power dissipation if the condition in which a short circuiting
continues for a long time.
In the S-1721 Series A, B, C, and D types, the ON/OFF pin is internally pulled up to VIN or pulled down to VSS, so
the VOUT pin is in the VSS level when in the floating status.
In A/B (1ch only) and C (2ch only), the ON/OFF pin is connected to VIN,
In B (2ch only)/C (1ch only)/D type, the ON/OFF pin is connected to VSS;
Note that during operation in these cases, the current consumption of the IC is generated as much as the current
which flows into a pull-up resistor of 2.6 MΩ or a pull-down resistor of 2.6 MΩ.
short
) when the output pin is short-circuited is internally set at approximately 150 mA (Typ.), and the
Characteristics (Typical Data) (Per Circuit)” to protect the output transistor
Seiko Instruments Inc.
Rev.1.1
_00