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| L1138_11 Datasheet, PDF (5/7 Pages) Unisonic Technologies – HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR WITH HIGH RIPPLE-REJECTION | |||
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L1138
Preliminary
CMOS IC
 OPERATION
1. Basic operation
The reference voltage (VREF) and VFB(the output voltage resistance-divided by feedback resistors RS and RF)
are the input for the error amplifier.
2. Output transistor
A low on-resistance P-channel MOSFET is used as the output transistor. Inverse current flowing from VOUT pin
through a parasitic diode to VIN pin can damage the regulator, so be sure that VOUT does not exceed VIN + 0.3V.
3. Shutdown pin (ON/OFF pin)
The shutdown pin can start and stop the regulator.The shutdown mode set by this pin can stop the operation
of all internal circuits. The structure of the ON/OFF pin is shown in Fig. 1. When the ON/OFF pin is not used,
connect it to the VSS pin if the logic type is âAâ and to the VIN pin if it is âBâ.
Logic Type
ON/OFF Pin
Internal Circuits
VOUT Pin Voltage
Current Consumption
A
âLâ: Power on
Operating
Set value
ISS1
A
âHâ: Power off
Stopped
VSS level
ISS2
B
âLâ: Power off
Stopped
VSS level
ISS2
B
âHâ: Power on
Operating
Set value
ISS1
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 7
QW-R502-323.d
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