LOW NOISE 150mA LDO REGULATOR
1
NO. EA-058-0204
OUTLINE
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FEATURES
• 01" ##$ ( $#-µ2
• ($ $#µ2
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APPLICATIONS
• :" * #( A%32( ,(*:
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• :" *$#"+ #'(
R1121N
2
BLOCK DIAGRAM
R1121Nxx1A R1121Nxx1B
Vref
Current Limit
V
DD
31
24
V
OUT
GNDCE
Vref
Current Limit
V
DD
31
24
V
OUT
GNDCE
SELECTION GUIDE
# % $#%#,($#%(#($#*!(
B+
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↑↑↑
Code Contents
( # 4.4/=
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2=>1?$#
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R1121N
3
PIN CONFIGURATION
SOT-23-5
54
NC CE
(mark side)
123
V
OUT
GND V
DD
PIN DESCRIPTION
Pin No. Symbol Description
4
# #(
A3 A (:(
-4
!(# :(
C #(:(
(((
ABSOLUTE MAXIMUM RATINGS
Symbol Item Rating Unit
4 !(# 4 D 4
4 !(# 4.:(/ -E4F- 4
4 # 4 -E4F- 4
! # ( '2
::"3#( 'G
# #('#
( CEH °
'# ( E °
R1121N
4
ELECTRICAL CHARACTERISTICS
• R1121Nxx1A #5°
Symbol Item Conditions Min. Typ. Max. Unit
4 # 4 454F4
'2≤!≤-'2
4
×DH
4
× 4
! # ( *1!21622!!$0:0
412A
∆4∆! 1 ( 454F4
'2≤!≤H'2 C '4
4 3# 4 *1!21622!!$0:0
412A
! ##$ ( 454F4 - 7 µ2
!($ ##$ (.($/ 45454F4 µ2
∆4∆4 1( ( 4F4≤4≤H4
!5-'2 94
##)( *5,68%##4##
454F4 7 ;
4 !(# 4 H 4
∆4∆ # 4
'# **(
!5-'2
C°≤#≤H°± ##'
°
!' (1' 454 '2
CE : #( Ω
4 CE !(# 4>6? 4 4
4 CE !(# 4>1? 4
( # ;G568E,68 - µ4'
R1121N
5
• R1121Nxx1B # 5 °
Symbol Item Conditions Min. Typ. Max. Unit
4 # 4 454F4
'2≤!≤-'2
4
×DH
4
× 4
! # ( *1!21622!!$0:0
412A
∆4∆! 1 ( 454F4
'2≤!≤H'2 C '4
4 3# 4 *1!21622!!$0:0
412A
! ##$ ( 454F4 - 7 µ2
!($ ##$ (.($/ 454F4
45A3 µ2
∆4∆4 1( ( 4F4≤4≤H4
!5-'2 94
##)( *5,68%##4##
454F4 7 ;
4 !(# 4 H 4
∆4∆ # 4
'# **(
!5-'2
C°≤#≤H°± ##'
°
!' (1' 454 '2
: "(( Ω
4 !(# 4>6? 4 4
4 !(# 4>1? 4
( # ;G568E,68 - µ4'
R1121N
6
• ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE
#5°
Output Current
IOUT (mA)
Output Voltage
VOUT (V) Conditions Min.
≤4≤7
H≤4≤ 4454
#5°
Dropout Voltage
VDIF (V)
Output Voltage
VOUT (V) Conditions Min. Typ. Max.
I C
7 -
H≤4≤D I C
≤4≤C - 7
≤4≤7 C -
H≤4≤-- -
-C≤4≤
!5'2
7 I
=G( # 4+ (4%4!
+ '(4
OPERATION
R1121Nxx1A R1121Nxx1B
VDD
31
24
VOUT
GND
R2
R1
CE Current Limit
Vref
VDD
31
24
VOUT
GND
R2
R1
CE Current Limit
Vref
!(!%* (* # %4$*,%(%(
'#"*($'#*%(( #
2 (' *#('(#( %(
R1121N
7
TEST CIRCUITS
R1121Nxx1B Series
V
DD
1
3
2
4
V
OUT
I
OUT
IN OUT
GND
CE
0.1µF
2.2µF
Standard test Circuit
R1121Nxx1B Series
V
DD
1
3
2
4
V
OUT
I
SS
IN OUT
GND
CE
0.1µF
2.2µF
Supply current Test
Circuit
Fig.1 Standard test Circuit Fig.2 Supply Current Test Circuit
R1121Nxx1B Series
V
DD
1
3
P. G 2
4
V
OUT
I
OUT
IN OUT
GND
CE
Ripple Rejection, Line
Transient Response
Test Circuit
R1121Nxx1B Series
V
DD
1
3
2
4
V
OUT
IN OUT
GND I1 I2
CE
1µF
Load Transient Response
Test Circuit
Fig.3 Ripple Rejection, Line Transient Response Fig.4 Load Transient Response Test Circuit
Test Circuit
R1121N
8
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
R1121N181B R1121N301B
2.0
3.8V 2.8V
2.3V
V
IN
= 2.1V
Topt = 25°C
1.8
1.6
1.0
0.8
0.6
0.4
0.2
1.4
1.2
0.0
Output Current I
OUT
(mA)
0 200 300 400 500100
Output Voltage V
OUT
(V)
3.5
5.0V
4.0V
3.5V
V
IN
= 3.3V
Topt = 25°C
2.5
1.5
1.0
0.5
2.0
3.0
0.0
Output Current I
OUT
(mA)
0 200 300 400 500100
Output Voltage V
OUT
(V)
R1121N401B R1121N501B
5.0
6.0V
Topt = 25°C
5.0V
4.5V
V
IN
= 4.3V
4.5
4.0
2.5
2.0
1.5
1.0
0.5
3.5
3.0
0.0
Output Current I
OUT
(mA)
0 200 300 400 500100
Output Voltage V
OUT
(V)
6.0
7.0V
Topt = 25°C
6.0V
5.5V
V
IN
= 5.3V
5.0
3.0
2.0
1.0
4.0
0.0
Output Current I
OUT
(mA)
0 200 300 400 500100
Output Voltage V
OUT
(V)
2) Output Voltage vs. Input Voltage
R1121N181B R1121N301B
2.0
Topt = 25°C
I
OUT
= 1mA
30mA
50mA
1.9
1.8
1.7
1.6
1.5
1.4
1.2
1.3
Input Voltage V
IN
(V)
1.0 4.0 5.0 6.0 7.0 8.02.0 3.0
Output Voltage V
OUT
(V)
3.1
3.0
2.9
2.8
2.7
2.5
2.6
Input Voltage V
IN
(V)
2.0 4.0 5.0 6.0 7.0 8.03.0
Output Voltage V
OUT
(V)
Topt = 25°C
30mA
50mA
I
OUT
=1mA
R1121N
9
R1121N401B R1121N501B
4.5
I
OUT
= 1mA
30mA
50mA
Topt = 25°C
4.0
3.5
3.0
2.5
Input Voltage V
IN
(V)
2.0 4.0 5.0 6.0 8.07.03.0
OUtput Voltage V
OUT
(V)
5.5
I
OUT
= 1mA
30mA
50mA
Topt = 25°C
5.0
4.0
3.5
3.0
4.5
2.5
Input Voltage V
IN
(V)
2.0 4.0 5.0 6.0 8.07.03.0
Output Voltage V
OUT
(V)
3) Dropout Voltage vs. Output Current
R1121N181B R1121N301B
1.20
Topt = 85°C
25°C
-40°C
1.00
0.80
0.60
0.40
0.20
0.00
Output Current I
OUT
(mA)
0 50 100 150
Dropout Voltage V
DIF
(V)
0.40
Topt = 85°C
25°C
-40°C
0.35
0.30
0.20
0.15
0.10
0.05
0.25
0.00
Output Current I
OUT
(mA)
0 50 100 150
Dropout Voltage V
DIF
(V)
R1121N401B R1121N501B
0.40
Topt = 85°C
25°C
-40°C
0.35
0.30
0.25
0.20
0.15
0.00
0.05
0.10
Output Current I
OUT
(mA)
0 50 100 150
Dropout Voltage V
DIF
(V)
0.40
Topt = 85°C
25°C
-40°C
0.35
0.30
0.25
0.20
0.15
0.00
0.05
0.10
Output Current IOUT (mA)
0 50 100 150
Dropout Voltage VDIF (V)
R1121N
10
4) Output Voltage vs. Temperature
R1121N181B R1121N301B
1.90
VIN = 2.8V
IOUT = 30mA
1.88
1.86
1.80
1.78
1.76
1.74
1.72
1.84
1.82
1.70
Temperature Topt (°C)
-50 0 25 50 10075-25
Output Voltage VOUT (V)
3.10 IOUT = 30mA
VIN = 4.0V
3.08
3.06
3.00
2.98
2.96
2.94
2.92
3.04
3.02
2.90
Temperature Topt (°C)
-50 0 25 50 10075-25
Output Voltage VOUT (V)
R1121N401B R1121N501B
4.10
I
OUT
= 30mA
V
IN
= 5.0V
4.08
4.06
4.00
3.98
3.96
3.94
3.92
4.04
4.02
3.90
Temperature Topt (°C)
-50 0 25 50 10075-25
Output Voltage V
OUT
(V)
5.10 I
OUT
= 30mA
V
IN
= 6.0V
5.08
5.06
5.00
4.98
4.96
4.94
4.92
5.04
5.02
4.90
Tempareture Topt (°C)
-50 0 25 50 10075-25
Output Voltage V
OUT
(V)
5) Supply Current vs. Input Voltage
R1121N181B R1121N301B
60
Topt = 25°C
50
40
30
20
0
10
Input Voltage VIN (V)
1.0 2.0 4.0 5.0 6.0 7.0 8.03.0
Supply Current ISS (µA)
60
Topt = 25°C
50
40
30
20
0
10
Input Voltage V
IN
(V)
1.0 2.0 4.0 5.0 6.0 7.0 8.03.0
Supply Current I
SS
(µA)
R1121N
11
R1121N401B R1121N501B
60
Topt = 25°C
50
40
30
20
10
0
Input Voltage V
IN
(V)
1.0 4.0 5.0 6.0 7.0 8.02.0 3.0
Supply Current I
SS
(µA)
60
Topt = 25°C
50
40
30
20
10
0
Input Voltage V
IN
(V)
1.0 4.0 5.0 6.0 7.0 8.02.0 3.0
Supply Current I
SS
(µA)
6) Supply Current vs. Temperature
R1121N181B R1121N301B
50
V
IN
= 2.8V
45
40
35
30
20
25
Temperature Topt (°C)
-50 50 1000
Supply Current I
SS
(µA)
50
V
IN
= 4.0V
45
40
35
30
20
25
Temperature Topt (°C)
-50 50 1000
Supply Current I
SS
(µA)
R1121N401B R1121N501B
50
V
IN
= 5.0V
45
40
35
30
20
25
Temperature Topt (°C)
-50 50 1000
Supply Current I
SS
(µA)
50
V
IN
= 6.0V
45
40
35
30
20
25
Temperature Topt (°C)
-50 50 1000
Supply Current I
SS
(µA)
R1121N
12
7) Dropout Voltage vs. Set Output Voltage
R1121Nxx1B
0.8
0.9
1.0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
1.0 2.0 3.0 4.0 5.0
I
OUT
= 150mA
I
OUT
= 100mA
I
OUT
= 50mA
I
OUT
= 30mA
I
OUT
= 10mA
Set Output Voltage Vreg (V)
Dropout Voltage V
DIF
(V)
Topt = 25°C
8) Ripple Rejection vs. Frequency
R1121N181B R1121N181B
80
70
60
50
40
30
20
10
0
0.1 1 10 100
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
Frequency f (kHz)
Ripple Rejection RR (dB)
V
IN
= 2.8V
DC
+ 0.5Vp-p
C
OUT
= tantal 1.0µF
80
70
60
50
40
30
20
10
0
0.1 1 10 100
IOUT= 1mA
IOUT = 30mA
IOUT = 50mA
Frequency f (kHz)
Ripple Rejection RR (dB)
VIN = 2.8VDC + 0.5Vp-p
COUT = tantal 2.2µF
R1121N301B R1121N301B
80
70
60
50
40
30
20
10
0
0.1 1 10 100
IOUT = 1mA
I
OUT
= 30mA
I
OUT
= 50mA
Frequency f (kHz)
Ripple Rejection RR (dB)
V
IN
= 4.0V
DC
+ 0.5Vp-p
C
OUT
= tantal 1.0µF
80
70
60
50
40
30
20
10
0
0.1 1 10 100
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
Frequency f (kHz)
Ripple Rejection RR (dB)
V
IN
= 4.0V
DC
+ 0.5Vp-p
C
OUT
= tantal 2.2µF
R1121N
13
R1121N401B R1121N401B
80
70
60
50
40
30
20
10
0
0.1 1 10 100
I
OUT
= 1mA
I
OUT
= 30mA
I
OUT
= 50mA
Frequency f (kHz)
Ripple Rejection RR (dB)
V
IN
= 5.0V
DC
+ 0.5Vp-p
C
OUT
= tantal 1.0µF
80
70
60
50
40
30
20
10
00.1 1 10 100
IOUT = 1mA
IOUT = 30mA
IOUT = 50mA
Frequency f (kHz)
Ripple Rejection RR (dB)
VIN = 5.0VDC + 0.5Vp-p
COUT = tantal 2.2µF
9) Ripple Rejection vs. Input Voltage (DC bias)
R1121N301B R1121N301B
80
70
60
50
40
30
20
10
0
3.1 3.2 3.3 3.4 3.5
f = 400Hz
f = 1kHz
f = 10kHz
Input Voltage V
IN
(V)
Ripple Rejection RR (dB)
I
OUT
= 1mA
C
OUT
= 2.2µF
80
70
60
50
40
30
20
10
0
3.1 3.2 3.3 3.4 3.5
f = 400Hz
f = 1kHz
f = 10kHz
Input Voltage V
IN
(V)
Ripple Rejection RR (dB)
I
OUT
= 10mA
C
OUT
= 2.2µF
R1121N301B
80
70
60
50
40
30
20
10
0
3.1 3.2 3.3 3.4 3.5
f = 400Hz
f = 1kHz
f = 10kHz
Input Voltage VIN (V)
Ripple Rejection RR (dB)
IOUT = 50mA
COUT = 2.2µF
R1121N
14
10) Line Transient Response
R1121N301B
I
OUT
=30mA
tr=tf=5 µs
C
OUT
=Tantalum 1.0µF
2.8
2.9
3.0
3.1
3.2
3.3
3.4
TIme t (µs)
OUtput Voltage V
OUT
(V)
Input Voltage V
IN
(V)
0 20 40 60 80 100 120
0
1
6
5
4
3
2
Input Voltage
Output Voltage
R1121N301B
I
OUT
=30mA
tr=tf=5 µs
C
OUT
=Tantalum 2.2µF
2.8
2.9
3.0
3.1
3.2
3.3
3.4
Time t (µs)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
0 20 40 60 80 100 120
0
1
6
5
4
3
2
Input Voltage
Output Voltage
R1121N301B
I
OUT
=30mA
tr=tf=5 µs
C
OUT
=Tantalum 6.8µF
2.8
2.9
3.0
3.1
3.2
3.3
3.4
Time t (µs)
Output Voltage V
OUT
(V)
Input Voltage V
IN
(V)
0 20 40 60 80 100 120
0
1
6
5
4
3
2
Input Voltage
Output Voltage
R1121N
15
11) Load Transient Response
R1121N301B
VIN=4V
CIN=Tantalum 1µF
COUT=Tantalum 1.0µF
2.8
2.9
3.0
3.1
3.2
3.3
3.4
Time t (µs)
Output Voltage VOUT (V)
Output Current IOUT (mA)
02468
10 12 14 16 18 20
-150
-100
150
100
50
0
-50
Output Current
Output Voltage
R1121N301B
VIN=4V
CIN=Tantalum 1µF
COUT=Tantalum 2.2µF
2.8
2.9
3.0
3.1
3.2
3.3
3.4
Time t (µs)
Output Voltage VOUT (V)
Output Current IOUT (mA)
02468
10 12 14 16 18 20
-150
-100
150
100
50
0
-50
Output Current
Output Voltage
R1121N301B
V
IN
=4V
C
IN
=Tantalum 1µF
C
OUT
=Tantalum 6.8µF
2.8
2.9
3.0
3.1
3.2
3.3
3.4
Time t (µs)
Output Voltage V
OUT
(V)
Output Current I
OUT
(mA)
02468
10 12 14 16 18 20
-150
-100
150
100
50
0
-50
Output Current
Output Voltage
R1121N
16
TECHNICAL NOTES
G( (!% (*"(#(=
• !(!%#'#(('* (#((* (J
# #% # "*+ ($(.+ (
(/((*"=
Vout
Iout
Vin
Vin
CE
GND ESR
Ceramic
Capacitor
Ceramic Capacitor
1µF
R1121N301B Spectrum
Analyzer
S.A.
4
3
2
1
Measuring Circuit for white noise ; R1121N301B
(#"(!. # (/(* # #"((#"(
("("( (Cµ4.2/($(#
.(=G(('#(( # #(" # #*#'#(
(% #( ' ( ; * % !" '&( '#((
( (:;/
K' (((L
./ 45C4
./ J+ ($(=6868
.-/ '# =°
R1121N301B R1121N301B
100.0
10.0
1.0
0.1
Output Current I
OUT
(mA)
0 10050 150
ESR (Ω)
Ceramic 1.0µF
100.0
10.0
1.0
0.1
Output Current IOUT (mA)
0 10050 150
ESR (Ω)
Ceramic 2.2µF
R1121N
17
• ,4(A3( **(!*'#(%(#, #(#('$
• ((#"#(*µJ'"(4(A3#
• &('#((%#$ # #% # !(',"(
#
TYPICAL APPLICATION
R1121Nxx1A V
OUT
OUTIN V
DD
GND
CE
Cap.
Cap.
R1121Nxx1B V
OUT
OUTIN V
DD
GND
CE
Cap.
Cap.
