S-812C25AUA-C2FT2G Seiko Instruments, S-812C25AUA-C2FT2G Datasheet - Page 20

• Manufacturer Part Number: S-812C25AUA-C2FT2G
• Description: IC REG LDO 30MA 2.5V SOT-89-3
• Manufacturer: Seiko Instruments

Specifications of S-812C25AUA-C2FT2G

• Regulator Topology: Positive Fixed
• Voltage - Output: 2.5V
• Voltage - Input: Up to 16V
• Voltage - Dropout (typical): 0.32V @ 10mA
• Number Of Regulators: 1
• Current - Output: 30mA (Min)
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-62, SOT-89, TO-243 (3 Leads + Tab)
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 18 V
• Output Voltage: 2.5 V
• Output Type: Fixed
• Dropout Voltage (max): 0.95 V
• Output Current: 75 mA
• Line Regulation: 20 mV
• Load Regulation: 30 mV
• Voltage Regulation Accuracy: 2 %
• Maximum Power Dissipation: 1000 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 728-1017-2

20
HIGH OPERATING VOLTAGE CMOS VOLTAGE REGULATOR
S-812C Series
2. Constant Current Circuit
3. Output Voltage Adjustment Circuit
(Only for S-812CxxA Series (No short-circuit protection, power-off function))
This circuit can be used as a constant current circuit if making the composition seen in Figure 19 and
20. Constant current I
Note that by using a circuit in Figure 19, it is impossible to set the better driving ability to the constant
amperage (I
To gain the driving ability which exceeds the S-812C Series, there’s a way to combine a constant
current circuit and a current boosting circuit, as seen in Figure 20.
The maximum input voltage for a constant current circuit is 16 V + the voltage for device (V
It is not recommended to add a capacitor between the VIN (power supply) and VSS pin or the VOUT
(output) and VSS pin because the rush current flows at power-on.
Set the value of resistors R1 and R2 so that the S-812C Series is not affected by current consumption
I
Capacitor C
value according to the actual evaluation.
It is not recommended to add a capacitor between the VIN (power supply) and VSS pin or the VOUT
(output) and VSS pin because it causes output fluctuation and output oscillation due to power-on.
I
(V
By using the composition seen in Figure 21, users are able to increase the output voltage. The value of
output voltage V
V
(V
SS
O
OUT1
= (V
.
OUT(E)
OUT(E)
= V
OUT(E)
= effective output voltage)
= effective output voltage)
OUT(E)
1
O
÷ R
) than the S-812C Series basically has.
reduces output fluctuation due to power-on, power fluctuation and load fluctuation. Set the
× (R
L
OUT1
) + I
1
SS
is calculated from the following equation:
+ R
O
is calculated from the following equation:
2
) ÷ R
GND
V
IN
GND
V
V
GND
IN
Figure 20 Constant Current Boost Circuit
IN
1
+ R
VIN
Figure 19 Constant Current Circuit
C
2
IN
VSS
× I
Seiko Instruments Inc.
S-812C
Series
C
ON/OFF
C
SS
C
R
IN
VIN
IN
1
1
Tr1
VSS
S-812C
Series
VIN
Figure 21
VSS
S-812C
Series
VOUT
ON/OFF
VOUT
VOUT
V
V
R
R
O
O
1
2
R
R
L
L
I
I
O
O
V
V
OUT
OUT
V
C
Device
Device
OUT1
L
O
Rev.5.0
).
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