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S-L2980A42MC-TF-U

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.5.1_00
S-L2980 Series
Seiko Instruments Inc.
7
Test Circuits
1.
VSS
VOUT
ON/OFF
VIN
V
A
Set to ON
+
+
Figure 4
2.
VSS
VOUT
ON/OFF
VIN
Set to
V
IN
or GND
A
+
Figure 5
3.
VSS
VOUT
ON/OFF
VIN
V
Set to ON
+
+
A
Figure 6
4.
VSS
VOUT
ON/OFF
VIN
V
A
R
L
+
+
Figure 7
5.
VSS
VOUT
ON/OFF
VIN
V
+
Set to ON
R
L
Figure 8
HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.5.1_00
Seiko Instruments Inc.
8
Standard Circuit
VSS
VOUT
ON/OFF
VIN
C
IN
*1
C
L
*2
INPUT
OUTPUT
GND
Single GND
*1. C
IN
is a capacitor used to stabilize input.
*2. A ceramic capacitor of 1.0 μF or more can be used for C
L
, provided that a ceramic capacitor of
2.2 μF or more can be used for the product whose output voltage is 1.7 V or less.
Figure 9
Caution The above connection diagram and constant will not guarantees successful operation.
Perform through evaluation using the actual application to set the constant.
Application Conditions
Input capacitor (C
IN
): 0.47 μF or more
Input series resistance (R
IN
): 10 Ω or less
Output capacitor (C
L
): 1.0 μF or more
*1
Equivalent Series Resistance (ESR) for output capacitor: 10 Ω or less
*1. If the product whose output voltage is 1.7 V or less will be used, the capacitance should be 2.2 μF or
more.
Caution Generally a series regulator may cause oscillation, depending on the selection of external
parts. Confirm that no oscillation occurs in the application for which the above capacitors
are used.
HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.5.1_00
S-L2980 Series
Seiko Instruments Inc.
9
Explanation of Terms
1. Low Dropout Voltage Regulator
This voltage regulator has the low dropout voltage due to its built-in low on-resistance transistor.
2. Low ESR
Low ESR means the Equivalent Series Resistance of a capacitor is small. The low ESR ceramics
output capacitor (C
L
) can be used in the S-L2980 Series. A capacitor whose ESR is 10Ω or less
can be used.
3. Output Voltage (V
OUT
)
The accuracy of the output voltage is ensured at ± 2.0 % under the specified conditions of fixed input
voltage
*1
, fixed output current, and fixed temperature.
*1. Differs depending upon the product.
Caution If the above conditions change, the output voltage value may vary and exceed the
accuracy range of the output voltage. Refer to the “ Electrical Characteristics” and
“ Typical Characteristics” for details.
⎟
⎠
⎞
⎜
⎝
⎛
•
OUTIN
OUT1
V ΔV
ΔV
Regulation Line 4.
Indicates the dependency of the output voltage on the input voltage. That is, the value shows how
much the output voltage changes due to a change in the input voltage with the output current remaining
unchanged.
5. Load Regulation (ΔV
OUT2
)
Indicates the dependency of the output voltage on the output current. That is, the value shows how
much the output voltage changes due to a change in the output current with the input voltage remaining
unchanged.
6. Dropout Voltage (V
drop
)
Indicates the difference between the input voltage (V
IN1
) and output voltage when the output voltage
falls to 98 % of the output voltage (V
OUT(E)
) by gradually decreasing the input voltage.
V
drop
=V
IN1
–(V
OUT(E)
×0.98)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

S-L2980A42MC-TF-U

Mfr. #:
Buy S-L2980A42MC-TF-U
Manufacturer:
ABLIC
Description:
LDO Voltage Regulators Linear LDO Reg Hi 90uA Iq 150mA Iout
Lifecycle:
New from this manufacturer.
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