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S-818A30AUC-BGK-T2 Datasheet(PDF) 7 Page - Seiko Instruments Inc

Part # S-818A30AUC-BGK-T2
Description  LOW DROPOUT CMOS VOLTAGE REGULATOR
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-818A30AUC-BGK-T2 Datasheet(HTML) 7 Page - Seiko Instruments Inc

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Rev.1.2
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series
Seiko Instruments Inc.
7
„ Operation
1. Basic operation
Figure 7 shows the block diagram of the S-818
Series.
The error amplifier compares a reference voltage
VREF with the part of the output voltage divided by the
feedback resistors Rs and Rf. It supplies the output
transistor with the gate voltage, necessary to ensure
certain output voltage free of any fluctuations of input
voltage and temperature.
2. Output transistor
The S-818 Series uses a low on-resistance Pch MOS FET as the output transistor.
Be sure that VOUT does not exceed VIN+0.3 V to prevent the voltage regulator from being broken due to
inverse current flowing from VOUT pin to VIN pin through the parasitic diode.
3. Power Off Pin (ON/OFF Pin)
This pin activates and inactivates the regulator.
When the ON/OFF pin is switched to the power off level, the operation of all internal circuit stops, the built-in
Pch MOSFET output transistor between VIN and VOUT pin is switched off, suppressing current consumption.
The VOUT pin goes to the Vss level due to internal divided resistance of several M
Ω between VOUT pin and
VSS pin.
The structure of the ON/OFF pin is shown in Figure 8. Since the ON/OFF pin is neither pulled down nor pulled
up internally, do not keep it in the floating state. Current consumption increases if a voltage of 0.3 V to VIN-0.3
V is applied to the ON/OFF pin. When the power off pin is not used, connect it to the VIN pin for product type
"A" and to the VSS pin for product type "B".
Table 6 Power off pin function by product type
Product
type
ON/OFF pin
Internal
circuit
VOUT pin
voltage
Current
consumption
A
“H” : Power on
Operating
Set value
Iss1
A
“L” : Power off
Stop
VSS level
Iss2
B
“H” : Power off
Stop
VSS level
Iss2
B
“L” : Power on
Operating
Set value
Iss1
Reference
voltage
circuit
VOUT
*1
*1 Parasitic diode
VSS
VIN
Rs
Rf
Error amplifier
Current
source
Vref
ON/OFF
VIN
VSS
Figure 8 ON/OFF Pin
Figure 7 Typical Circuit Block Diagram


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