NO. EA-043-0006
/2:#5,33/(#92/7 $*(
5(*8/$725#:,7+#(;7(51$/
75$16,6725
5185)#6(5,(6
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LOW RIPPLE VOLTAGE REGULATOR
WITH EXTERNAL TRANSISTOR
5185)#6(5,(6
1
OUTLINE
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FEATURES
• 8OWUD#/RZ#6XSSO\#&XUUHQW 11111111111111111111111111111111111111111117<31#63—$
• 6WDQGE\#0RGH 1111111111111111111111111111111111111111111111111111111111111117<31#314—$
• +LJK#$FFXUDF\#2XWSXW#9R O W D J H 111111111111111111111111111111111111“513(
• +LJK#5LSSOH#5HMHFWLRQ 111111111111111111111111111111111111111111111111117<31#93G%2I 4N+]
• /RZ#'URSRXW#9R O W D J H 1111111111111111111111111111111111111111111111111117<31#31492,
287
433P$/#GHSHQGHQW#RQ#([WHUQDO#7U1
• /RZ#7HPSHUDWXUH#'ULIW 1111111111111111111111111111111111111111111111117<31#“433SSP2ƒ&
• +LJK#/LQH#5HJXODWLRQ 1111111111111111111111111111111111111111111111111117<31#3138(29
• 2XWSXW#9R O W D J H 111111111111111111111111111111111111111111111111111111111111116WHSZLVH# VHWWLQJ# ZLWK# D# VWHS# RI# 3149# LQ# WKH# UDQJH# RI# 41;9# WR
9139
• &XUUHQW#/LPLW#IRU#H[WHUQDO#7U 111111111111111111111111111111111111117<31#;P$/#/LPLW#D#EDVH#FXUUHQW
APPLICATIONS
• 3RZHU#VRXUFH#IRU#EDWWHU\0SRZHUHG#HTXLSPHQW
• 7HOHFRPPXQLFDWLRQV/#&DPHUDV/#9&5V
• 3RZHU#VRXUFH#IRU#GRPHVWLF#DSSOLDQFHV
RN5RF
2
BLOCK DIAGRAM
RN5RF
××
××××
××
A RN5RF
××
××××
××
B
2
5
1
V
OUT
GND
V
DD
CE
Vref
3
Current Limit
+
-
4
EXT
2
5
1
V
OUT
GND
V
DD
CE
Vref
3
Current Limit
+
-
4
EXT
SELECTION GUIDE
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5185)#×××ײ××
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↑ ↑↑ ↑
DEF G
Code Contents
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287
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RN5RF
3
PIN CONFIGURATION
SOT-23-5
12
3
54
(mark side)
CE/CE
EXT
GND V
DDVOUT
PIN DESCRIPTION
Pin No. Symbol Pin Description
4 *1' *URXQG#3LQ
5 9
''
,QSXW#3LQ
6 9
287
2XWSXW#3LQ
7 (;7 ([WHUQDO#7UDQVLVWRU#'ULYH#3LQ#+&026#2XWSXW,
8 &(#RU#&( &KLS#(QDEOH#3LQ
ABSOLUTE MAXIMUM RATINGS
Symbol Item Rating Unit
9
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ABSOLUTE MAXIMUM RATINGS
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GLWLRQV1#0RUHRYHU/#VXFK#YDOXHV#IRU#DQ\#WZR#LWHPV#PXVW#QRW#EH#UHDFKHG#VLPXOWDQHRXVO\1#2SHUDWLRQ#DERYH#WKHVH#DEVR0
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RN5RF
4
ELECTRICAL CHARACTERISTICS
7R S W 58ƒ&
Symbol Item Conditions MIN. TYP. MAX. Unit
9
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2XWSXW#9R O W D J H
9
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287
4139
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5
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&(+
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9
9
&(/
&(#,QSXW#9ROWDJH#´/µ 3 3158 9
*1) The output current depends on the performanc e of extern al PNP tr ansistor. Use External PNP tr ans is-
tor of a low saturation type, with an hFE between 100 and 300.
*) With respect to Test Circuit, refer to Typical Application.
RN5RF
5
7R S W 58ƒ&
Symbol Item Conditions MIN. TYP. MAX. Unit
9
287
2XWSXW#9R O W D J H
9
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4139
,
287
83P$
9
287
×
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9
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5
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9
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*1) The output current depends on the performanc e of extern al PNP tr ansistor. Use External PNP trans is-
tor of a low saturation type, with an hFE between 100 and 300.
*) With respect to Test Circuit, refer to Typical Application.
RN5RF
6
OPERATION
2
5
1
V
OUT
GND
V
DD
CE
Vref
3
Current Limit
+
-
4
EXT
IN
GND
RN5RF
××
A
PNP Tr
Ra
Rb
C
L
C
OUT
GND
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Notes on selecting external components
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RN5RF
7
TEST CIRCUITS
PNP
EXT
V
OUT
OUT
10µF
GND
CE
10µF
V
DD
IN
RN5RF
××
A
5
1
3
4
2
I
OUT
PNP
EXT
V
OUT
OUT
10µF
GND
CE
10µF
V
DD
IN
RN5RF
××
A
5
1
3
4
2
I
SS
Basic Test Circuit Test Circuit for Supply Current
PNP
EXT
V
OUT
OUT
10µF
GND
CE
V
DD
IN
RN5RF
××
A
5
1
3
4
2
P.G
I
OUT
PNP
EXT
V
OUT
OUT
10µF
GND
CE
10µF
V
DD
IN
RN5RF
××
A
5
1
3
4
2
Test Circuit for Ripple Rejection and Line
Transient Response
T est Circuit for Load Transient Response
RN5RF
8
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Input Voltage (Topt=25°C)
RN5RF30A RN5RF50A
3.20
2.60
2.40
2.20
3.00
2.80
2.00
Input V oltage VIN(V)
Output V oltage V
OUT
(V)
2345678910
I
OUT
=0mA
I
OUT
=100mA
I
OUT
=500mA
5.20
4.60
4.40
4.20
5.00
4.80
4.00
Input V oltage VIN(V)
Output V oltage V
OUT
(V)
45678910
I
OUT
=0mA
I
OUT
=100mA
I
OUT
=500mA
2) Output Voltage vs. Output Current (Topt=25°C)
RN5RF30A RN5RF50A
3.10
2.95
2.90
2.85
3.05
3.00
2.80
Output Current I
OUT
(mA)
Output V oltage V
OUT
(V)
0 100 200 300 400 500
V
IN
=4V
5.10
4.95
4.90
4.85
5.05
5.00
4.80
Output Current I
OUT
(mA)
Output V oltage V
OUT
(V)
0 100 200 300 400 500
V
IN
=6V
3) Dropout Voltage vs. Output Current
RN5RF30A RN5RF50A
0.50
0.20
0.40
0.30
0.10
0.00
Output Current I
OUT
(mA)
Dropout V oltage V
DIF
(V)
0 300100 200 400 500
Topt=-40
Topt=25
Topt=85
0.50
0.20
0.40
0.30
0.10
0.00
Output Current I
OUT
(mA)
Dropout V oltage V
DIF
(V)
0 300100 200 400 500
Topt=-40
Topt=25
Topt=85
RN5RF
9
4) Output Voltage vs. Temperature
RN5RF30A RN5RF50A
3.10
3.00
3.05
2.95
2.90
Temperature Topt( )
Output V oltage V
OUT
(V)
-50 25-25 0 50 75 100
V
IN
=4V,I
OUT
=10mA
5.10
5.00
5.05
4.95
4.90
-50 25-25 0 50 75 100
V
IN
=6V,I
OUT
=10mA
Temperature Topt( )
Output V oltage V
OUT
(V)
5) Supply Current vs. Input Voltage (Topt=25°C)
RN5RF30A RN5RF50A
100
60
50
80
70
90
40
30
20
10
0
Input V oltage VIN(V)
Supply Current I
SS
(µA)
0426810
I
OUT
=0mA
100
60
50
80
70
90
40
30
20
10
0
Input V oltage VIN(V)
Supply Current I
SS
(µA)
0426810
I
OUT
=0mA
6) Supply Current vs. Temperature
RN5RF30A RN5RF50A
50
30
40
20
10
0
Temperature Topt( )
Supply Current I
SS
(µA)
-50 0-25 25 50 75 100
V
IN
=4V,I
OUT
=0mA
50
30
40
20
10
0
Temperature Topt( )
Supply Current I
SS
(µA)
-50 0-25 25 50 75 100
V
IN
=6V,I
OUT
=0mA
RN5RF
10
7) Ripple Rejection vs. Frequency (Topt=25°C)
RN5RF30A RN5RF50A
80
70
50
60
40
20
30
10
0
Frequency (kHz)
Ripple Rejection (dB)
0.01 0.1 1 10 100
V
IN
=4Vdc+0.5Vp-p,I
OUT
=100mA,CL=10µF
80
70
50
60
40
20
30
10
0
Frequency (kHz)
Ripple Rejection (dB)
0.01 0.1 1 10 100
V
IN
=6Vdc+0.5Vp-p,I
OUT
=100mA,CL=10µF
8) Line Transient Response (Topt=25°C)
RN5RF30A RN5RF50A
6
5
4
3
2
1
0
Time T(µs)
Input V oltage V
IN
(V)
-50 0-25 25 50 75 100 125 150
I
OUT
=300mA,CL=10µF
3.3
3.2
3.1
3
2.9
2.8
2.7
Output V oltage V
OUT
(V)
Input V oltage
Output V oltage
8
7
6
5
4
3
2
Time T(µs)
Input V oltage V
IN
(V)
-50 0-25 25 50 75 100 125 150
I
OUT
=300mA,CL=10µF
5.3
5.2
5.1
5
4.9
4.8
4.7
Output V oltage V
OUT
(V)
Input V oltage
Output V oltage
9) Load Transient Response (Topt=25°C)
RN5RF30A RN5RF50A
200
100
0
-100
-200
-300
-400
3.3
3.2
3.1
3
2.9
2.8
2.7
Time T(µs)
Output Current I
OUT
(mA)
Output V oltage V
OUT
(V)
-100 0 100 200 300 400
V
IN
=4V,CL=10µF
Output Current
Output V oltage
200
100
0
-100
-200
-300
-400
Time T(µs)
Output Current I
OUT
(mA)
-100 0 100 200 300 400
VIN=6V,CL=10µF
5.3
5.2
5.1
5
4.9
4.8
4.7
Output V oltage V
OUT
(V)
Output Current
Output V oltage
RN5RF
11
TYPICAL APPLICATION
PNP Tr
EXT
OUT
Cap.
+
GND
CE
V
DD
IN
RN5RF××A
V
OUT
Cap.
+
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