Rev.2.3_01
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 conventional 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 % accuracy
• Low dropout voltage: 120 mV typ. (at 3.0 V output product, IOUT=50 mA)
• Low current consumption: During operation: 90 µA typ., 140 µA max.
During shutdown: 0.1 µA typ., 1.0 µA max.
• High peak current capability: 150 mA output is possible. (at VIN≥VOUT(S)+1.0 V)*1
• Built-in shutdown circuit: Ensure long battery life.
• Low ESR capacitor: A 1.0 µF capacitor can be used as the output capacitor.
(A 2.2 µF 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. (at 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
Package Name Drawing Code
Package Tape Reel
SOT-23-5 MP005-A MP005-A MP005-A
5-Pin SON(A) PN005-A PN005-A PN005-A
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series Rev.2.3_01
2 Seiko Instruments Inc.
Block Diagram
VIN
VSS
VOUT
ON/OFF
*1. Parasitic diode
*1
+
−
Shutdown circuit
Reference
voltage circuit
Figure 1
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.3_01 S-L2980 Series
Seiko Instruments Inc. 3
Product Name Structure
• The product types, output voltage and packages for S-L2980 Series can be selected at the user’s request.
Refer to the “1. Product Name” for the construction of the product name and “2. 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
(e.g. 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. Refer to the taping specifications.
*2. Refer to the “2. Product Name List”.
*3. Refer to the “3. Shutdown Pin (ON/OFF Pin)” in the “ Operation”.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series Rev.2.3_01
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-L2980A15MC-C6ATF S-L2980A15PN-C6ATF
1.6 V ±2.0 % S-L2980A16MC-C6BTF S-L2980A16PN-C6BTF
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-L2980A19MC-C6ETF S-L2980A19PN-C6ETF
2.0 V ±2.0 % S-L2980A20MC-C6FTF S-L2980A20PN-C6FTF
2.1 V ±2.0 % S-L2980A21MC-C6GTF S-L2980A21PN-C6GTF
2.2 V ±2.0 % S-L2980A22MC-C6HTF S-L2980A22PN-C6HTF
2.3 V ±2.0 % S-L2980A23MC-C6ITF S-L2980A23PN-C6ITF
2.4 V ±2.0 % S-L2980A24MC-C6JTF S-L2980A24PN-C6JTF
2.5 V ±2.0 % S-L2980A25MC-C6KTF S-L2980A25PN-C6KTF
2.6 V ±2.0 % S-L2980A26MC-C6LTF S-L2980A26PN-C6LTF
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-L2980A29MC-C6OTF S-L2980A29PN-C6OTF
3.0 V ±2.0 % S-L2980A30MC-C6PTF S-L2980A30PN-C6PTF
3.1 V ±2.0 % S-L2980A31MC-C6QTF S-L2980A31PN-C6QTF
3.2 V ±2.0 % S-L2980A32MC-C6RTF S-L2980A32PN-C6RTF
3.3 V ±2.0 % S-L2980A33MC-C6STF S-L2980A33PN-C6STF
3.4 V ±2.0 % S-L2980A34MC-C6TTF S-L2980A34PN-C6TTF
3.5 V ±2.0 % S-L2980A35MC-C6UTF S-L2980A35PN-C6UTF
3.6 V ±2.0 % S-L2980A36MC-C6VTF S-L2980A36PN-C6VTF
3.7 V ±2.0 % S-L2980A37MC-C6WTF S-L2980A37PN-C6WTF
3.8 V ±2.0 % S-L2980A38MC-C6XTF S-L2980A38PN-C6XTF
3.9 V ±2.0 % S-L2980A39MC-C6YTF S-L2980A39PN-C6YTF
4.0 V ±2.0 % S-L2980A40MC-C6ZTF S-L2980A40PN-C6ZTF
4.1 V ±2.0 % S-L2980A41MC-C7ATF S-L2980A41PN-C7ATF
4.2 V ±2.0 % S-L2980A42MC-C7BTF S-L2980A42PN-C7BTF
4.3 V ±2.0 % S-L2980A43MC-C7CTF S-L2980A43PN-C7CTF
4.4 V ±2.0 % S-L2980A44MC-C7DTF S-L2980A44PN-C7DTF
4.5 V ±2.0 % S-L2980A45MC-C7ETF S-L2980A45PN-C7ETF
4.6 V ±2.0 % S-L2980A46MC-C7FTF S-L2980A46PN-C7FTF
4.7 V ±2.0 % S-L2980A47MC-C7GTF S-L2980A47PN-C7GTF
4.8 V ±2.0 % S-L2980A48MC-C7HTF S-L2980A48PN-C7HTF
4.9 V ±2.0 % S-L2980A49MC-C7ITF S-L2980A49PN-C7ITF
5.0 V ±2.0 % S-L2980A50MC-C7JTF S-L2980A50PN-C7JTF
5.1 V ±2.0 % S-L2980A51MC-C7KTF S-L2980A51PN-C7KTF
5.2 V ±2.0 % S-L2980A52MC-C7LTF S-L2980A52PN-C7LTF
5.3 V ±2.0 % S-L2980A53MC-C7MTF S-L2980A53PN-C7MTF
5.4 V ±2.0 % S-L2980A54MC-C7NTF S-L2980A54PN-C7NTF
5.5 V ±2.0 % S-L2980A55MC-C7OTF S-L2980A55PN-C7OTF
5.6 V ±2.0 % S-L2980A56MC-C7PTF S-L2980A56PN-C7PTF
5.7 V ±2.0 % S-L2980A57MC-C7QTF S-L2980A57PN-C7QTF
5.8 V ±2.0 % S-L2980A58MC-C7RTF S-L2980A58PN-C7RTF
5.9 V ±2.0 % S-L2980A59MC-C7STF S-L2980A59PN-C7STF
6.0 V ±2.0 % S-L2980A60MC-C7TTF S-L2980A60PN-C7TTF
Remark Please contact the SII marketing department for type B products.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.3_01 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
SOT-23-5
Top view
5
4
3
2
1
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
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
4 5
2 3
5-Pin SON(A)
Top view
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
Figure 3
Absolute Maximum Ratings
Table 4
(Ta=25 °C unless otherwise specified)
Item Symbol Absolute Maximum Rating Unit
Input voltage VIN V
SS–0.3 to VSS+12 V
V
ON/OFF V
SS–0.3 to VSS+12
Output voltage VOUT V
SS–0.3 to VIN+0.3
Power dissipation PD SOT-23-5 300 mW
5-Pin SON(A) 150
Operating ambient temperature Topr –40 to +85 °C
Storage ambient temperature Tstg –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.2.3_01
6 Seiko Instruments Inc.
Electrical Characteristics
Table 5
(Ta=25 °C unless otherwise specified)
Item Symbol Condition Min. Typ. Max. Unit
Te s t
circuit
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
OUTIN
1 OUT
VV
∆
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
VTa∆
V∆
•
V
IN
=V
OUT(S)
+1.0 V, I
OUT
=50 mA,
–40
°
C
≤
Ta
≤
85
°
C
±
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
µ
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
Ω
1.5
4
ON/OFF pin
input voltage “L” V
SL
V
IN
=V
OUT(S)
+1.0 V, R
L
=1.0 k
Ω
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
µ
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. VOUT(S): Specified output voltage
VOUT(E): Actual output voltage at the fixed load
The output voltage when fixing IOUT(=50 mA) and inputting VOUT(S)+1.0 V
*2. Output current at which output voltage becomes 95 % of VOUT after gradually increasing output current.
*3. Vdrop=VIN1−(VOUT×0.98)
VIN1 is the input voltage at which output voltage becomes 98 % of VOUT after gradually decreasing input voltage.
*4. Temperature change ratio in the output voltage [mV/°C] is calculated by using the following equation.
[] [] []
1000Cppm/
TV∆Ta
∆V
VVCmV/
∆Ta
∆V
OU
OUT
OUT(S)
OUT ÷°
•
×=° 3*2*
*1
*1. Temperature change ratio of the 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.2.3_01 S-L2980 Series
Seiko Instruments Inc. 7
Test Circuits
1.
VSS
VOUT
ON/OFF
VIN
V
A
Set to
p
ower 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
p
ower 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
power ON
R
L
Figure 8
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series Rev.2.3_01
8 Seiko Instruments Inc.
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 (CIN): 0.47 µF or more
Input series resistance (RIN): 10 Ω or less
Output capacitor (CL): 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, CL is 2.2 µF or more.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.3_01 S-L2980 Series
Seiko Instruments Inc. 9
Technical 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 (CL) can be used in the S-L2980 Series. The ESR of the CL should be 10 Ω or less.
3. Output Voltage (VOUT)
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 ∆V
∆V
Regulation Line 4.
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 (∆VOUT2)
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 (Vdrop)
Indicates the difference between the input voltage (VIN1) and output voltage when the output voltage
falls to 98 % of the output voltage (VOUT(E)) by gradually decreasing the input voltage.
Vdrop=VIN1–(VOUT(E)×0.98)
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series Rev.2.3_01
10 Seiko Instruments Inc.
()
OUT
OUT
V ∆Ta
∆V
tageOutput Vol oft Coefficien eTemperatur 7. •
The shadowed area in Figure 10 is the range where VOUT varies in the operating temperature range
when the temperature coefficient of the output voltage is ±100 ppm/°C.
VOUT
(
E
)
*1
−40 25
+0.28 mV / °C
VOUT
[V]
85 Ta [°C]
−0.28 mV / °C
Example for S-L2980A28 Typ. product
*1. V
OUT(E) is a mesured value of output voltage at 25 °C.
Figure 10
Temperature change ratio in the output voltage [mV/°C] is calculated by using the following equation.
[] [] []
1000Cppm/
TV∆Ta
∆V
VVCmV/
∆Ta
∆V
OU
OUT
OUT(S)
OUT ÷°
•
×=° 3*2*
*1
*1. Temperature change ratio of the output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.3_01 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 (Vref) with the Vfb, which is the output voltage
resistance-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.
Reference voltage circuit
VOUT
*1
VSS
VIN
R
s
R
f
Error
amplifier
Current source
V
ref
–
+
V
fb
*1. Parasitic diode
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 VOUT does not exceed VIN+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.2.3_01
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 kΩ 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 VIN–0.3 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 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
VSS
ON/OFF
VIN
Figure 12
Selection of Output Capacitor (CL)
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 µF 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 µF or more and the ESR should be 10 Ω 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 µF
or more.
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.3_01 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 (CL) and a capacitor for stabilizing the
input between VIN and VSS pins (CIN), 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 (CIN): 0.47 µF or more
Output capacitor (CL): 1.0 µF or more*1
Equivalent Series Resistance (ESR): 10 Ω or less
Input series resistance (RIN): 10 Ω 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 µF
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.
• 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.2.3_01
14 Seiko Instruments Inc.
Typical Characteristics
1. Output voltage versus Output current (When load current increases)
S-L2980A15 (Ta=25°C) S-L2980A30 (Ta=25°C)
0.0
0.5
1.0
1.5
2.0
0 100 200 300 400 500
IOUT [mA]
VOUT [V]
VIN=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
0100 200 300 400 500
IOUT [mA]
V
OUT
[
V
]
V
IN
=3.3 V
3.5 V
4.0 V
10 V
5.0 V
S-L2980A50 (Ta=25°C)
0.0
1.0
2.0
3.0
4.0
5.0
6.0
0 100 200 300 400 500
IOUT [mA]
VOUT [V]
VIN=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 Table 5 for 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
VIN [V]
I
max.
[
mA
]
Ta=–40°C
25°C 85°C
0
100
200
300
400
500
2 4 6 8 10
VIN [V]
IOUT max. [mA]
Ta=–40°C
25°C
85°C
S-L2980A50 (Short circuit protection included)
0
100
200
300
400
500
4 6 8 10
VIN [V]
I
max.
[
mA
]
Ta=–40°C
25°C 85°C
Remark In determining output current, attention
should be paid to the followings.
1) The minimum output current value
and footnote *5 in the Table 5 for the
“ Electrical Characteristics”.
2) The package power dissipation
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.3_01 S-L2980 Series
Seiko Instruments Inc. 15
3. Output voltage versus Input voltage
S-L2980A15 (Ta=25°C) S-L2980A30 (Ta=25°C)
1.40
1.45
1.50
1.55
1.60
1 1.5 22.5 3 3.5
VIN [V]
VOUT [V]
IOUT=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 33.5 4 4.5 5
VIN [V]
VOUT [V]
IOUT=1.0 mA
30 mA
50 mA
100 mA
S-L2980A50 (Ta=25°C)
4.75
4.85
4.95
5.05
5.15
5.25
4.5 5 5.5 6 6.5 7
VIN [V]
VOUT [V]
I
OU
T=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
IOUT [mA]
Vdrop [mV]
Ta=–40°C
25°C
85°C
0
50
100
150
200
250
300
350
400
050 100 150
IOUT [mA]
Vdrop [mV]
Ta=–40°C
25°C
85°C
S-L2980A50
0
50
100
150
200
250
300
350
0 50 100 150
IOUT [mA]
Vdrop [mV]
Ta=–40°C
25°C
85°C
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series Rev.2.3_01
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]
VOUT [V]
2.94
2.96
2.98
3.00
3.02
3.04
3.06
–50 0 50 100
Ta [°C]
VOUT [V]
S-L2980A50
4.90
4.95
5.00
5.05
5.10
–50 0 50 100
Ta [°C]
VOUT [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]
∆
VOUT1 [mV]
S-L2980A15
CIN=4.7
µ
F, CL=10
µ
F
S-L2980A30
S-L2980A50
0
10
20
30
40
–50 0 50 100
Ta [°C]
∆VOUT2 [mV]
S-L2980A15
CIN=4.7 µF, CL=10 µF
S-L2980A30
S-L2980A50
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.3_01 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
VIN [V]
VSH / VSL [V]
Ta=–40°C
25°C
85°C
Ta=–40°C
25°C
85°C
RL=100 Ω, CIN=4.7
µ
F, CL=10
µ
F
9. Current consumption versus Input voltage
S-L2980A15 S-L2980A30
0
20
40
60
80
100
0 2 4 6 8 10
VIN [V]
ISS1 [
µ
A]
25°C 85°C
Ta=–40°C
0
20
40
60
80
100
0 2 4 6 8 10
VIN [V]
ISS1 [
µ
A]
25°C 85°C
Ta=–40°C
S-L2980A50
0
20
40
60
80
100
0 2 4 6 8 10
VIN [V]
ISS1 [
µ
A]
25°C 85°C
Ta=–40°C
10. Ripple rejection
S-L2980A30 (Ta=25°C) S-L2980A50 (Ta=25°C)
0
20
40
60
80
100
Frequency [Hz]
Ripple Rejection [dB]
V
IN
=4.0 V, C
L
=2.2 µF
10
100
1 k 10 k
100 k 1 M
50 mA
I
OUT
=1 mA
0
20
40
60
80
100
Frequency [Hz]
Ripple Rejection [dB]
V
IN
=6.0 V, C
L
=2.2 µF
10
100
1 k
10 k
100 k 1 M
50 mA
I
OUT
=1 mA
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-L2980 Series Rev.2.3_01
18 Seiko Instruments Inc.
Reference Data
1. Transient Response Characteristics (S-L2980A30MC, Typical data, Ta=25°C)
Overshoot
Input voltage
or
Load current
Output voltage
Undershoot
1-1. Power Source Fluctuation
Overshoot Undershoot
TIME (20
µ
s / div.)
VOUT (0.05 V / div.)
VIN
CL=2.2
µ
F
VIN, VON/OFF=4.0 →5.0 V, IOUT=1.0 mA
5.0 V
4.0 V
3.0 V
TIME (20
µ
s / div.)
VOUT (0.05 V / div.)
VIN
CL=2.2
µ
F
5.0 V
4.0 V
3.0 V
VIN, VON/OFF=5.0→4.0 V, IOUT=1.0 mA
Overshoot Undershoot
TIME (20
µ
s / div.)
VOUT (0.05 V / div.)
VIN
CL=2.2
µ
F
5.0 V
4.0 V
3.0 V
VIN, VON/OFF=4.0→5.0 V, IOUT=50 mA
TIME (20
µ
s / div.)
VOUT (0.05 V / div.)
VIN
CL=2.2
µ
F
VIN, VON/OFF=5.0→4.0 V, IOUT=50 mA
5.0 V
4.0 V
3.0 V
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.2.3_01 S-L2980 Series
Seiko Instruments Inc. 19
1-2. Load Fluctuation
Overshoot Undershoot
TIME (20
µ
s / div.)
VOUT (0.05 V / div.)
IOUT
CL=2.2
µ
F
VIN, VON/OFF=4.0 V, IOUT=50 mA→1.0 mA
50 mA
1.0 mA
3.0 V
TIME (20
µ
s / div.)
3.0 V
VOUT (0.05 V / div.)
IOUT
CL=2.2
µ
F
VIN, VON/OFF=4.0 V, IOUT=1.0 mA→50 mA
50 mA
1.0 mA
1-3. ON/OFF Switching
Overshoot Undershoot
0
1
2
3
4
5
6
7
TIME (20
µ
s / div.)
VOUT [V]
VON/OFF
VIN=6.0 V, RL=5.0 Ω, CL=2.2 µF
VOUT
0
1
2
3
4
5
6
7
TIME (20
µ
s / div.)
VOUT [V]
VON/OFF
VIN=6.0 V, RL=5.0 Ω, CL=2.2
µ
F
VOUT
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
2.9±0.2
1.9±0.2
0.95±0.1
0.4±0.1
0.16 +0.1
-0.06
123
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.
ø1.5 +0.1
-0 2.0±0.05
ø1.0 +0.2
-0 4.0±0.1
1.4±0.2
0.25±0.1
3.2±0.2
123
45
No. MP005-A-C-SD-2.1
MP005-A-C-SD-2.1
SOT235-A-Carrier Tape
Feed direction
4.0±0.1(10 pitches:40.0±0.2)
No.
TITLE
SCALE
UNIT mm
Seiko Instruments Inc.
12.5max.
9.0±0.3
ø13±0.2
(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
2.0±0.2
1
5
0.2
0.65
No.
TITLE
SCALE
UNIT mm
4
23
+0.1
-0.05
0.65
1.3±0.1
No. PN005-A-P-SD-1.1
PN005-A-P-SD-1.1
SON5A-A-PKG Dimensions
Seiko Instruments Inc.
ø1.55±0.05
ø1.05±0.1
4.0±0.1
4.0±0.1 0.2±0.05
1.1±0.1
2.05±0.1
(2.25)
No.
TITLE
SCALE
UNIT mm
12
5
4
3
2.0±0.1
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.
9.0±0.3
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
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• When the products described herein are regulated products subject to the Wassenaar Arrangement or other
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• Use of the information described herein for other purposes and/or reproduction or copying without the
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failure or malfunction of semiconductor products may occur. The user of these products should therefore
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