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S-818A52AMC-BHGT2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00
S-818 Series
Seiko Instruments Inc.
13
3. ON/OFF pin (Shutdown pin)
This pin activates and inactivates the regulator.
When the ON/OFF pin is switched to the shutdown level, the operation of all internal circuit stops, the
built-in Pch MOS FET 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 MΩ
between VOUT pin and VSS pin.
The structure of the ON/OFF pin is shown in Figure 13. 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 V
IN
−0.3 V is applied to the ON/OFF pin. When the shutdown 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 ON/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 I
ss1
A “L”: Shutdown Stop VSS level I
ss2
B “H”: Shutdown Stop VSS level I
ss2
B “L”: Power on Operating Set value I
ss1
ON/OFF
VIN
VSS
Figure 13 The structure of the ON/OFF Pin
Selection of Output Capacitor (C
L
)
The S-818 Series needs an output capacitor between VOUT pin and VSS pin for phase compensation. A
small ceramic or an OS electrolyte capacitor of 2 μF or more can be used. When a tantalum or an
aluminum electrolyte capacitor is used, the capacitance must be 2 μF or more and the ESR must be 10 Ω
or less.
Attention should be paid not to cause an oscillation due to increase of ESR at low temperatures when an
aluminum electrolyte capacitor is used.
Evaluate the performance including temperature characteristics before prototyping the circuit.
Overshoot and undershoot characteristics differ depending upon the type of the output capacitor. Refer
to the “C
L
dependence” data in “ Transient Response Characteristics”.
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series
Rev.3.0_00
Seiko Instruments Inc.
14
Precautions
• Wiring patterns for the VIN pin, VOUT pin and GND pin should be designed so that the impedance is low.
When mounting an output capacitor (C
L
) or an input capacitor (C
IN
), the distance from the capacitor to the
VOUT pin and to the VSS pin should be as short as possible.
• Note that output voltage may increase when a voltage regulator is used at low load current (Less than
10 μA).
• To prevent oscillation, the external components should be used under the following conditions:
Input capacitor (C
IN
): 0.47μF or more
Output capacitor (C
L
): 2 μF or more
Equivalent series resistance (ESR): 10 Ω or less
Input series resistance (R
IN
): 10 Ω or less
• The voltage regulator may oscillate when the impedance of the power supply is high and the input
capacitor is small or not connected.
• The application condition for input voltage and load current should not exceed the package power
dissipation.
• In determining output current, attention should be paid to the output current value specified and footnote *5
in Table 5 in the “ Electrical Characteristics”.
• Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in
electrostatic protection circuit.
• SII claims no responsibility for any and all disputes arising out of or in connection with any infringement by
products including this IC of patents owned by a third party.
LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.3.0_00
S-818 Series
Seiko Instruments Inc.
15
Characteristics (Typical data)
1. Output Voltage (V
OUT
) vs. Output Current (I
OUT
) (When load current increases)
S-818A20A S-818A30A
1.0
2.0
0
0.2
0.4
0.6
0.8
I
OUT
[A]
V
OUT
[V]
V
IN
=2.3 V
4 V
5 V
3 V
10 V
2.5 V
(Ta=25 °C)
0.0
(Ta=25 °C)
0.0
1.0
2.0
3.0
0
0.2
0.4
0.6
0.8
I
OUT
[A]
V
OUT
[V]
10 V
6 V
5 V
4V
3.5 V
V
IN
=
3.3 V
S-818A50A
(Ta=25 °C)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0 0.2
0.4
0.6
0.8
I
OUT
[A]
V
OUT
[V]
7 V
V
IN
=5.3 V
5.5 V
6 V
8 V
10 V
Remark In determining necessary output current,
consider the following parameters:
1. Output current value in the “ Electrical
Characteristics” and footnote *5.
2. Power dissipation of the package
2. Output voltage (V
OUT
) vs. Input voltage (V
IN
)
S-818A20A (Ta=25°C)
1.0
1.5
2.0
2.5
1234
V
IN
(V)
V
OUT
(V)
60mA
I
OUT
=10
μ
A
1mA
30mA
100
μ
A
S-818A30A (Ta=25°C)
1.5
2.0
2.5
3.0
3.5
2345
V
IN
(V)
V
OUT
(V)
30mA
60mA
I
OUT
=10
μ
A
1mA
100
μ
A
S-818A50A (Ta=25°C)
4.0
4.5
5.0
5.5
4567
V
IN
(V)
VOUT(V)
30mA
60mA
1mA
I
OUT
=10
μ
A
100
μ
A
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32

S-818A52AMC-BHGT2G

Mfr. #:
Buy S-818A52AMC-BHGT2G
Manufacturer:
ABLIC
Description:
LDO Voltage Regulators Linear LDO regulator 30uA Iq 300mA Iout
Lifecycle:
New from this manufacturer.
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