Document Outline
- S-L2980 Series
- Cover
- Features
- Applications
- Packages
- Block Diagram
- Product Code Structure
- Pin Configurations
- Absolute Maximum Ratings
- Electrical Characteristics
- Test Circuits
- Standard Circuit
- Application Conditions
- Explanation of Terms
- Operation
- Selection of Output Capacitor (CL)
- Precautions
- Typical Characteristics
- Transient Response Characteristics (S-L2980A30MC Typical data: Ta=25C)
- Package Drawings
- SOT-23-5
Rev.2.2
_00
HIGH RIPPLE-REJECTION LOW DROPOUT
CMOS VOLTAGE REGULATOR
S-L2980 Series
Seiko Instruments Inc.
1
The S-L2980 series is a positive voltage regulator
with a low dropout voltage, high output voltage
accuracy, and low current consumption developed
based on CMOS technology.
A built-in low on-resistance transistor provides a low
dropout voltage and a large output current. A
shutdown circuit ensures long battery life.
Various types of output capacitors can be used in the
S-L2980 series compared with the former CMOS
voltage regulators. A small ceramic capacitor can
also be used.
Features
Output voltage:
1.5 V to 6.0 V, selectable in 0.1 V steps
High accuracy output voltage: 2.0 %
Low dropout voltage:
120 mV typ.
(@ 3.0 V output product, I
OUT
=50 mA)
Low current consumption:
During operation: 90
A typ., 140 A max.
During shutdown: 0.1
A typ., 1.0 A max.
High peak current capability: 150 mA output is possible. (@ V
IN
V
OUT(S)
+1.0 V)
*1
Built-in shutdown circuit:
Ensure long battery life.
Low ESR capacitor:
A 1.0
F capacitor can be used as the output capacitor.
(A 2.2
F capacitor can be used as the output capacitor for the products
whose output voltage is 1.7 V or less.)
High ripple rejection:
70 dB typ. (@ 1.0 kHz)
Small package:
SOT-23-5, 5-Pin SON(A)
*1. Attention should be paid to the power dissipation of the package when the load is large.
Applications
Power supply for battery-powered devices
Power supply for personal communication devices
Power supply for home electric/electronic appliances
Power supply for cellular phones
Packages
SOT-23-5
(Package drawing code: MP005-A)
5-Pin SON(A) (Package drawing code: PN005-A)
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
2
Seiko Instruments Inc.
Block Diagram
VIN
Reference voltage
circuit
VOUT
ON/OFF
VSS
*1. Parasitic diode
+
*1
Shutdown circuit
Figure 1
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
3
Product Code Structure
The product types, output voltage and packages for S-L2980 Series can be selected at the user's request.
Please refer to the "Product name" for the construction of the product name and "Product name list" for
the full product names.
1. Product name
S-L2980 x xx xx xxx TF
IC direction in tape specifications
*1
Product name (abbreviation)
*2
Package name (abbreviation)
MC:
SOT-23-5
PN: 5-Pin SON(A)
Output voltage
15 to 60
(Ex. When the output voltage is 1.5 V, it is
expressed as 15.)
Product type
*3
A: ON/OFF pin positive logic
B: ON/OFF pin negative logic
*1. Please refer to the taping specifications at the end of this book.
*2. Please refer to the product name list.
*3. Please refer to the "3. Shutdown pin (ON/OFF pin)" in the operation.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
4
Seiko Instruments Inc.
2. Product name list
Table 1
Output
Voltage
SOT-23-5
5-Pin
SON(A)
1.5 V 2.0%
S-L2980A15PN-C6ATF
1.7 V 2.0%
S-L2980A17MC-C6CTF
S-L2980A17PN-C6CTF
1.8 V 2.0%
S-L2980A18MC-C6DTF
S-L2980A18PN-C6DTF
1.9 V 2.0%
S-L2980A19PN-C6ETF
2.5 V 2.0%
S-L2980A25MC-C6KTF
S-L2980A25PN-C6KTF
2.7 V 2.0%
S-L2980A27MC-C6MTF
S-L2980A27PN-C6MTF
2.8 V 2.0%
S-L2980A28MC-C6NTF
S-L2980A28PN-C6NTF
2.9 V 2.0%
S-L2980A29PN-C6OTF
3.0 V 2.0%
S-L2980A30MC-C6PTF
S-L2980A30PN-C6PTF
3.1 V 2.0%
S-L2980A31MC-C6QTF
3.2 V 2.0%
S-L2980A32MC-C6RTF
3.3 V 2.0%
S-L2980A33MC-C6STF
S-L2980A33PN-C6STF
3.6 V
2.0%
S-L2980A36MC-C6VTS
3.8 V 2.0%
S-L2980A38MC-C6XTF
S-L2980A38PN-C6XTF
4.0 V 2.0%
S-L2980A40MC-C6ZTF
S-L2980A40PN-C6ZTF
4.1 V 2.0%
S-L2980A41MC-C7ATF
4.4 V 2.0%
S-L2980A44MC-C7DTF
4.5 V 2.0%
S-L2980A45PN-C7ETF
4.8 V 2.0%
S-L2980A48MC-C7HTF
5.0 V 2.0%
S-L2980A50MC-C7JTF
S-L2980A50PN-C7JTF
Remark Please contact the SII marketing department for products with an output voltage other than
those specified above or type B products.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
5
Pin Configurations
Table
2
Pin No.
Symbol
Pin Description
1
VIN
Input
voltage
pin
2
VSS
GND
pin
3
ON/OFF
Shutdown
pin
4
NC
*1
No connection
5
VOUT
Output voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
1 2
3
4
5
SOT-23-5
Top view
Figure
2
Table
3
Pin No.
Symbol
Pin Description
1
NC
*1
No connection
2
VSS
GND
pin
3
ON/OFF
Shutdown
pin
4
VIN
Input
voltage
pin
5
VOUT
Output voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
3
2
1
4
5
5-Pin SON(A)
Top view
Figure
3
Absolute Maximum Ratings
Table 4
(Ta=25
C unless otherwise specified)
Items Symbols
Absolute
Maximum
Ratings
Units
Input voltage
V
IN
V
SS
0.3 to V
SS
+12 V
V
ON/OFF
V
SS
0.3 to V
SS
+12
Output voltage
V
OUT
V
SS
0.3 to V
IN
+0.3
Power dissipation
P
D
SOT-23-5 300
mW
5-Pin
SON(A)
150
Operating ambient temperature
T
opr
40
to
+85
C
Storage ambient temperature
T
stg
40
to
+125
Caution The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage. These values must therefore not be exceeded under any conditions.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
6
Seiko Instruments Inc.
Electrical Characteristics
Table 5
(Ta=25
C unless otherwise specified)
Items Symbols
Conditions
Min.
Typ.
Max.
Units
Test
circuits
Output voltage
*1
V
OUT(E)
V
IN
=V
OUT(S)
+1.0 V, I
OUT
=50 mA
V
OUT(S)
0.98
V
OUT(S)
V
OUT(S)
1.02
V 1
Output current
*2
I
OUT
V
IN
V
OUT(S)
+1.0 V
150
*5
mA 3
Dropout voltage
*3
V
drop
I
OUT
= 50 mA
1.5 V
V
OUT(S)
1.7 V
0.17 0.33 V 1
1.8
V
V
OUT(S)
1.9 V
0.16 0.29
2.0
V
V
OUT(S)
2.4 V
0.15 0.26
2.5
V
V
OUT(S)
2.9 V
0.13 0.20
3.0
V
V
OUT(S)
3.2 V
0.12 0.15
3.3
V
V
OUT(S)
6.0 V
0.11 0.14
Line regulation
OUT
IN
1
OUT
V
V
V
V
OUT(S)
+0.5 V
V
IN
10 V,
I
OUT
=50 mA
0.05
0.2
% / V
1
Load regulation
V
OUT2
V
IN
=V
OUT(S)
+1.0 V
1.0 mA
I
OUT
80 mA
12 40 mV
Output voltage
temperature coefficient
*4
OUT
OUT
V
Ta
V
V
IN
=V
OUT(S)
+1.0 V, I
OUT
=50 mA,
40
C Ta 85C
100
ppm
/
C
Current consumption
during operation
I
SS1
V
IN
=V
OUT(S)
+1.0 V, ON/OFF pin=ON,
no load
90 140 A 2
Current consumption
when shutdown
I
SS2
V
IN
=V
OUT(S)
+1.0 V, ON/OFF pin =OFF,
no load
0.1 1.0
Input voltage
V
IN
2.0
10 V
ON/OFF pin
input voltage "H"
V
SH
V
IN
=V
OUT(S)
+1.0 V, R
L
=1.0 k
1.5
4
ON/OFF pin
input voltage "L"
V
SL
V
IN
=V
OUT(S)
+1.0 V, R
L
=1.0 k
0.3
ON/OFF pin
input current "H"
I
SH
V
IN
=V
OUT(S)
+1.0 V, V
ON/OFF
=7.0 V
0.1
0.1 A
ON/OFF pin
input current "L"
I
SL
V
IN
=V
OUT(S)
+1.0 V, V
ON/OFF
=0 V
0.1
0.1
Ripple rejection
RR
1.5 V
V
OUT(S)
3.3 V
70 dB 5
3.4
V
V
OUT(S)
5.0 V
65
V
IN
=V
OUT(S)
+1.0 V
f = 1.0 kHz
V
rip
=0.5 V rms
I
OUT
=50 mA
5.1 V
V
OUT(S)
6.0 V
60
*1. V
OUT(S)
: Specified output voltage
V
OUT(E)
: Actual output voltage at the fixed load
The output voltage when fixing I
OUT
(=50 mA) and inputting V
OUT(S)
+1.0 V
*2. Output current at which output voltage becomes 95% of V
OUT
after gradually increasing output current.
*3. V
drop
=V
IN1
-(V
OUT
0.98)
V
IN1
is the input voltage at which output voltage becomes 98% of
V
OUT
after gradually decreasing input voltage.
*4. A change in temperatures [mV/C] is calculated using the following equation.
[
]
[ ]
[
]
1000
C
ppm/
V
Ta
V
V
V
C
mV/
Ta
V
OUT
OUT
OUT(S)
OUT
=
3
*
2
*
1
*
*1. Change in temperature of output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
*5. The output current can be supplied at least to this value.
Due to restrictions on the package power dissipation, this value may not be satisfied
Attention should be paid to the power dissipation of the package when the load is large.
This specification is guaranteed by design.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
7
Test Circuits
1.
VSS
VOUT
ON/OFF
Set to
power ON
VIN
V
A
+
+
Figure
4
2.
VSS
VOUT
ON/OFF
Set to
V
IN
or GND
VIN
A
Figure
5
3.
Set to
power ON
VSS
VOUT
ON/OFF
VIN
V
A
+
+
Figure
6
4.
VSS
VOUT
ON/OFF
VIN
A
V
R
L
+
+
Figure
7
5.
VSS
VOUT
ON/OFF
Set to
power ON
VIN
V
R
L
+
Figure
8
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
8
Seiko Instruments Inc.
Standard Circuit
ON/OFF
VSS
VOUT
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
F or more can be used for C
L
, provided that A ceramic capacitor of
2.2
F 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
F or more
Input series resistance (R
IN
) :
10
or less
Output capacitor (C
L
) :
1.0
F or more
*1
Equivalent Series Resistance (ESR) for output capacitor: 10
or less
*1. If the product whose output voltage is 1.7 V or less will be used, C
L
is 2.2
F or more.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
9
Explanation of Terms
1. Low dropout voltage regulator
The low dropout voltage regulator is a voltage regulator whose dropout voltage is low due to its low on-
resistance built-in 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. The ESR of the C
L
should be 10
or less.
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. Please see the electrical characteristics and
attached characteristics data for details.
V
V
V
regulation
Line
4.
OUT
IN
1
OUT
Indicates the dependency of the output voltage on the input voltage. That is, the values show how much
the output voltage changes due to a change in the input voltage with the output current remaining
unchanged.
5. Load regulation (
V
OUT2
)
Indicates the dependency of the output voltage on the output current. That is, the values show 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)
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
10
Seiko Instruments Inc.
OUT
OUT
V
Ta
V
voltage
output
of
t
coefficien
ure
. Temperat
7
The shadowed area in Figure 10 is the range where V
OUT
varies in the operating temperature range
when the temperature coefficient of the output voltage is
100 ppm/C.
Ex. S-L2980A28 Typ.
40 25
+0.28 mV /
C
V
OUT
[V]
*1. V
OUT(E)
is a mesured value of output voltage at 25
C.
V
OUT(E)
*1
85
Ta [
C]
0.28 mV /
C
Figure 10
A change in the temperatures of output voltage [mV/C] is calculated using the following equation.
[
]
[ ]
[
]
1000
C
/
ppm
V
Ta
V
V
C
mV/
Ta
V
OUT
VOUT
)
S
(
OUT
OUT
=
3
*
2
*
*1
*1. Change in temperatures of output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
11
Operation
1. Basic operation
Figure 11 shows the block diagram of the S-L2980 Series.
The error amplifier compares the reference voltage (V
ref
) with the V
fb
, which is the output voltage
resistance-divided by the feedback resistors R
s
and R
f
. It supplies the output transistor with the gate
voltage, necessary to ensure certain output voltage free of any fluctuations of input voltage and
temperature.
Reference voltage circuit
VOUT
*1
*1. Parasitic diode
VSS
VIN
R
s
R
f
Error
amplifier
Current source
V
ref
+
V
fb
Figure 11
2. Output transistor
The S-L2980 Series uses a low on-resistance P-channel MOS FET as the output transistor.
Be sure that V
OUT
does not exceed V
IN
+0.3 V to prevent the voltage regulator from being broken due to
inverse current flowing from VOUT pin through a parasitic diode to VIN pin.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
12
Seiko Instruments Inc.
3. Shutdown Pin (ON/OFF Pin)
This pin starts and stops the regulator.
When the ON/OFF pin is turned to the shutdown level, the operation of all internal circuits stops, the
built-in P-channel MOS FET output transistor between VIN pin and VOUT pin is turned off to make
current consumption drastically reduced. The VOUT pin becomes the Vss level due to internally divided
resistance of several hundreds k
between the VOUT pin and VSS pin.
Furthermore, the structure of the ON/OFF pin is as shown in Figure 12. Since the ON/OFF pin is neither
pulled down nor pulled up internally, do not use it in the floating state. In addition, please note that
current consumption increases if a voltage of 0.3 V to VIN0.3 V is applied to the ON/OFF pin. When
the ON/OFF pin is not used, connect it to the VIN pin in case the logic type is "A" and to the VSS pin in
case of "B".
Table 6
Logic type
ON/OFF pin
Internal circuit
VOUT pin voltage
Current consumption
A
"H": Power on
Operating
Set value
I
SS1
A
"L": Power off
Stop
V
SS
level
I
SS2
B "H":
Power
off Stop
V
SS
level
I
SS2
B
"L": Power on
Operating
Set value
I
SS1
VSS
ON/OFF
VIN
Figure 12
Selection of Output Capacitor (C
L
)
The S-L2980 series needs an output capacitor between VOUT pin and VSS pin for phase compensation.
A ceramic capacitor whose capacitance is 1.0
F or more
*1
can be used. When an OS (Organic Semi-
conductor) capacitor, a tantalum capacitor or an aluminum electrolyte capacitor is used, the capacitance
should be 2.2
F or more and the ESR should be 10 or less.
Overshoot and undershoot characteristics differ depending upon the magnitude of the output capacitor in
use.
Sufficient evaluation including temperature dependency in the actual environment is needed.
*1. If the product whose output voltage is 1.7 V or less will be used, the capacitance should be 2.2
F
or more.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
13
Precautions
Wiring patterns for VIN pin, VOUT pin and GND pin should be designed to hold low impedance. When
mounting an output capacitor between the VOUT and VSS pins (C
L
) and a capacitor for stabilizing the
input between VIN and VSS pins (C
IN
), the distance from the capacitors to these pins should be as short
as possible.
Note that output voltage may increase when a series regulator is used at low load current (1.0 mA or
less).
Generally a series regulator may cause oscillation, depending on the selection of external parts. The
following conditions are recommended for this IC. However, be sure to perform sufficient evaluation
under the actual usage conditions for selection, including evaluation of temperature characteristics.
Input capacitor (C
IN
): 0.47
F or more
Output capacitor (C
L
): 1.0
F or more
*1
Equivalent Series Resistance (ESR): 10
or less
Input series resistance (R
IN
): 10
or less
*1. If the product whose output voltage will be is 1.7 V or less is used, the capacitance should be
2.2
F or more.
A 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, output voltage and load current should not exceed the
package power dissipation.
Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in
electrostatic protection circuit.
In determining output current attention should be paid to the output current value specified in the table 5
for electrical characteristics and the footnote *5 of the table 5.
SII claims no responsibility for any and all disputes arising out of or in connection with any infringement
of the products including this IC upon patents owned by a third party.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
14
Seiko Instruments Inc.
Typical Characteristics
(1) Output voltage versus Output current (When load current increases)
S-L2980A15 (Ta=25C)
S-L2980A30 (Ta=25C)
0.0
0.5
1.0
1.5
2.0
0
100
200
300
400
500
I
OUT
[mA]
V
OUT
[V
]
V
IN
=1.8 V
2.0 V
10 V
3.0 V
2.5 V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
100
200
300
400
500
I
OUT
[mA]
V
OUT
[
V
]
V
IN
=3.3 V
3.5 V
4.0 V
10 V
5.0 V
S-L2980A50 (Ta=25C)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0
100
200
300
400
500
I
OUT
[mA]
V
OUT
[V]
V
IN
=5.3 V
5.5 V
7.0 V
6.0 V
10 V
Remark In determining output current, attention
should be paid to the followings.
1) The minimum output current value and
footnote *5 in the electrical characteristics.
2) The package power dissipation
(2) Maximum output current versus Input voltage
S-L2980A15 (Short-circuit protection included)
S-L2980A30 (Short-circuit protection included)
0
100
200
300
400
500
0 2 4 6 8 10
V
IN
[V]
I
OU
T
ma
x
.
[
mA
]
Ta=40C
25C
85C
0
100
200
300
400
500
2
4
6
8
10
V
IN
[V]
I
OU
T
ma
x
.
[
m
A
]
Ta=40C
25C
85C
S-L2980A50 (Short circuit protection included)
0
100
200
300
400
500
4
6
8
10
V
IN
[V]
I
OU
T
ma
x
.
[
mA
]
Ta=40C
25C
85C
Remark In determining output current, attention
should be paid to the followings.
1) The minimum output current value and
footnote *5 in the electrical characteristics.
2) The package power dissipation
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
15
(3) Output voltage versus Input voltage
S-L2980A15 (Ta=25C)
S-L2980A30 (Ta=25C)
1.40
1.45
1.50
1.55
1.60
1
1.5
2
2.5
3
3.5
V
IN
[V]
V
OUT
[V]
I
OUT
=1.0 mA
30 mA
50 mA
100 mA
2.85
2.90
2.95
3.00
3.05
3.10
3.15
2.5
3
3.5
4
4.5
5
V
IN
[V]
V
OUT
[V]
I
OUT
=1.0 mA
30 mA
50 mA
100 mA
S-L2980A50 (Ta=25C)
4.75
4.85
4.95
5.05
5.15
5.25
4.5
5
5.5
6
6.5
7
V
IN
[V]
V
OUT
[V]
I
OUT
=1.0 mA
30 mA
50 mA
100 mA
(4) Dropout voltage versus Output voltage
S-L2980A15 S-L2980A30
0
100
200
300
400
500
600
0
50
100
150
I
OUT
[mA]
V
drop
[m
V]
Ta=40C
25C
85C
0
50
100
150
200
250
300
350
400
0
50
100
150
I
OUT
[mA]
V
drop
[mV]
Ta=40C
25C
85C
S-L2980A50
0
50
100
150
200
250
300
350
0
50
100
150
I
OUT
[mA]
V
drop
[mV]
Ta=40C
25C
85C
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
16
Seiko Instruments Inc.
(5) Output voltage versus Ambient Temperature
S-L2980A15 S-L2980A30
1.47
1.48
1.49
1.50
1.51
1.52
1.53
50
0
50
100
Ta [C]
V
OUT
[
V
]
2.94
2.96
2.98
3.00
3.02
3.04
3.06
50
0
50
100
Ta [C]
V
OUT
[
V
]
S-L2980A50
4.90
4.95
5.00
5.05
5.10
50
0
50
100
Ta [C]
V
OUT
[
V
]
(6) Line regulation versus Ambient Temperature
(7) Load regulation versus Ambient Temperature
S-L2980Axx S-L2980Axx
0
10
20
30
40
50
0
50
100
Ta [C]
V
OUT
1
[mV
]
S-L2980A15
C
IN
=4.7
F, C
L
=10
F
S-L2980A30
S-L2980A50
0
10
20
30
40
50
0
50
100
Ta [C]
V
OUT
2
[m
V
]
S-L2980A15
C
IN
=4.7
F, C
L
=10
F
S-L2980A30
S-L2980A50
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
17
(8) Threshold voltage of ON/OFF pin versus Input voltage
S-L2980A15
0.0
0.5
1.0
1.5
0
2
4
6
8
10
12
V
IN
[V]
V
SH
/
V
SL
[
V
]
Ta=40C
25C
85C
Ta=40C
25C
85C
R
L
=100
, C
IN
=4.7
F, C
L
=10
F
(9) Current consumption versus Input voltage
S-L2980A15 S-L2980A30
0
20
40
60
80
100
0
2
4
6
8
10
V
IN
[V]
I
SS1
[
A]
25C
85C
Ta=40C
0
20
40
60
80
100
0
2
4
6
8
10
V
IN
[V]
I
SS1
[
A]
25C
85C
Ta=40C
S-L2980A50
0
20
40
60
80
100
0
2
4
6
8
10
V
IN
[V]
I
SS1
[
A]
25C
85C
Ta=40C
(10) Ripple rejection
S-L2980A30 (Ta=25C)
S-L2980A50 (Ta=25C)
0
20
40
60
80
100
Frequency [Hz]
R
i
pp
le r
e
j
e
c
t
ion
[d
B]
50 mA
I
OUT
=1.0 mA
V
IN
=4.0 V, C
L
=2.2
F
10
100
1k
10k
100k
1M
0
20
40
60
80
100
Frequency [Hz]
R
i
pp
le r
e
j
e
c
t
ion
[d
B]
50 mA
I
OUT
=1.0 mA
V
IN
=6.0 V, C
L
=2.2
F
10
100
1k
10k
100k
1M
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series
Rev.2.2
_00
18
Seiko Instruments Inc.
Reference Data
Transient Response Characteristics (S-L2980A30MC Typical data: Ta=25
C)
Overshoot
Input voltage
or
Load current
Output voltage
Undershoot
(1) Power source fluctuation
Overshoot Undershoot
TIME (20
s / div.)
V
OUT
(0
.05
V
/
d
i
v
.
)
V
IN
C
L
=2.2
F
V
IN
, V
ON/OFF
=4.0
5.0 V, I
OUT
=1.0 mA
5.0 V
4.0 V
3.0 V
TIME (20
s / div.)
V
OUT
(
0
.0
5 V
/
d
i
v
.
)
V
IN
C
L
=2.2
F
5.0 V
4.0 V
3.0 V
V
IN
, V
ON/OFF
=5.04.0 V, I
OUT
=1.0 mA
Overshoot Undershoot
TIME (20
s / div.)
V
OUT
(0
.05
V
/
d
i
v
.
)
V
IN
C
L
=2.2
F
5.0 V
4.0 V
3.0 V
V
IN
, V
ON/OFF
=4.05.0 V, I
OUT
=50 mA
TIME (20
s / div.)
V
OUT
(0
.05
V
/
d
i
v
.
)
V
IN
C
L
=2.2
F
V
IN
, V
ON/OFF
=5.04.0 V, I
OUT
=50 mA
5.0 V
4.0 V
3.0 V
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.2
_00
S-L2980 Series
Seiko Instruments Inc.
19
(2) Load fluctuation
Overshoot Undershoot
TIME (20
s / div.)
V
OUT
(0
.0
5
V
/
d
i
v
.
)
I
OUT
C
L
=2.2
F
V
IN
, V
ON/OFF
=4.0 V, I
OUT
=50 mA
1.0 mA
50 mA
1.0 mA
3.0 V
TIME (20
s / div.)
3.0 V
V
OUT
(
0
.0
5 V
/
d
i
v
.
)
I
OUT
C
L
=2.2
F
V
IN
, V
ON/OFF
=4.0 V, I
OUT
=1.0 mA
50 mA
50 mA
1.0 mA
(3) ON
/OFF switching
Overshoot Undershoot
0
1
2
3
4
5
6
7
TIME (20
s / div.)
V
OUT
[V
]
V
ON/OFF
V
IN
=6.0 V, R
L
=5.0
, C
L
=2.2
F
V
OUT
0
1
2
3
4
5
6
7
TIME (20
s / div.)
V
OUT
[V
]
V
ON/OFF
V
IN
=6.0 V, R
L
=5.0
, C
L
=2.2
F
V
OUT
No.
TITLE
SCALE
UNIT
mm
Seiko Instruments Inc.
2.90.2
1.90.2
0.950.1
0.40.1
0.16
+0.1
-0.06
1
2
3
4
5
No. MP005-A-P-SD-1.2
MP005-A-P-SD-1.2
SOT235-A-PKG Dimensions
No.
TITLE
SCALE
UNIT
mm
Seiko Instruments Inc.
1.5
+0.1
-0
2.00.05
1.0
+0.2
-0
4.00.1
1.40.2
0.250.1
3.20.2
1
2
3
4
5
No. MP005-A-C-SD-2.1
MP005-A-C-SD-2.1
SOT235-A-Carrier Tape
Feed direction
4.00.1(10 pitches:40.00.2)
No.
TITLE
SCALE
UNIT
mm
Seiko Instruments Inc.
12.5max.
9.00.3
130.2
(60)
(60)
QTY.
3,000
No. MP005-A-R-SD-1.1
MP005-A-R-SD-1.1
SOT235-A-Reel
Enlarged drawing in the central part
2.00.2
1
5
0.2
0.65
No.
TITLE
SCALE
UNIT
mm
4
2
3
+0.1
-0.05
0.65
1.30.1
No. PN005-A-P-SD-1.1
PN005-A-P-SD-1.1
SON5A-A-PKG Dimensions
Seiko Instruments Inc.
1.550.05
1.050.1
4.00.1
4.00.1
0.20.05
1.10.1
2.050.1
(2.25)
No.
TITLE
SCALE
UNIT
mm
1
2
5
4
3
2.00.1
No. PN005-A-C-SD-1.1
PN005-A-C-SD-1.1
SON5A-A-Carrier Tape
Feed direction
Seiko Instruments Inc.
No.
TITLE
SCALE
UNIT
mm
QTY.
3000
12.5max.
9.00.3
Seiko Instruments Inc.
Enlarged drawing in the central part
No. PN005-A-R-SD-1.1
PN005-A-R-SD-1.1
SON5A-A-Reel
The information described herein is subject to change without notice.
Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein
whose related industrial properties, patents, or other rights belong to third parties. The application circuit
examples explain typical applications of the products, and do not guarantee the success of any specific
mass-production design.
When the products described herein are regulated products subject to the Wassenaar Arrangement or other
agreements, they may not be exported without authorization from the appropriate governmental authority.
Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Seiko Instruments Inc. is strictly prohibited.
The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus
installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc.
Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the
failure or malfunction of semiconductor products may occur. The user of these products should therefore
give thorough consideration to safety design, including redundancy, fire-prevention measures, and
malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.
PDF 
ZIP