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$33/,&$7,21#0$18$/
5185)#6(5,(6
NO. EA-043-0006
LOW RIPPLE VOLTAGE REGULATOR WITH EXTERNAL TRANSISTOR
5185)#6(5,(6
OUTLINE
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
FEATURES
* 8OWUD#/RZ#6XSSO\#&XUUHQW 11111111111111111111111111111111111111111117<3 1#63--$ * 6WDQGE\#0RGH 1111111111111111111111111111111111111111111111111111111111111117<3 1#314--$ * +LJK#$FFXUDF\#2XWSXW#9ROWDJH 111111111111111111111111111111111111"513( * +LJK#5LSSOH#5HMHFWLRQ 111111111111111111111111111111111111111111111111117<3 1#93G%2I 4N+] * /RZ#'URSRXW#9ROWDJH 1111111111111111111111111111111111111111111111111117<3 1#31492,287 433P$/#GHSHQGHQW#RQ#([WHUQDO#7U1 * /RZ#7HPSHUDWXUH#'ULIW 1111111111111111111111111111111111111111111111117<3 1#"433SSP2& * +LJK#/LQH#5HJXODWLRQ 1111111111111111111111111111111111111111111111111117<3 1#3138(29 * 2XWSXW#9ROWDJH111111111111111111111111111111111111111111111111111111111111116WHSZLVH# VHWWLQJ# ZLWK# D# VWHS# RI# 3149# LQ# WKH# UDQJH# RI# 41;9# WR 9139 * &XUUHQW#/LPLW#IRU#H[WHUQDO#7U 111111111111111111111111111111111111117<3 1#;P$/#/LPLW#D#EDVH#FXUUHQW
APPLICATIONS
* 3RZHU#VRXUFH#IRU#EDWWHU\0SRZHUHG#HTXLSPHQW * 7HOHFRPPXQLFDWLRQV/#&DPHUDV/#9&5V * 3RZHU#VRXUFH#IRU#GRPHVWLF#DSSOLDQFHV
1
RN5RF
BLOCK DIAGRAM
xxA RN5RFxx xx
4
VDD 2 + Vref Current Limit CE 5 Vref Current Limit EXT
xxB RN5RFxx xx
4 3
VOUT VDD 2 + EXT
3
VOUT
1 GND
CE 5
1 GND
SELECTION GUIDE
7KH#RXWSXW#YROWDJH/#WKH#FKLS#HQDEOH#DFWLYH#W\SH/#WKH#SDFNLQJ#W\SH#DQG#WKH#WDSLQJ#W\SH#IRU#WKH#,&V#FDQ#EH#VHOHFWHG#DW WKH#XVHU*V#UHTXHVW1 7KH#VHOHFWLRQ#FDQ#EH#PDGH#E\#GHVLJQDWLQJ#WKH#SDUW#QXPEHU#DV#VKRZQ#EHORZ= 5185)#xxxxxx3DUW#1XPEHU D EF G Code D 6HWWLQJ#2XWSXW#9ROWDJH#+9287,#= 6WHSZLVH#VHWWLQJ#ZLWK#D#VWHS#RI#3149#LQ#WKH#UDQJH#RI#41;9#WR#9139#LV#SRVVLEOH1 'HVLJQDWLRQ#RI#&KLS#HQDEOH#$FWLYH#7\SH E $=#/#DFWLYH#W\SH %=#+#DFWLYH#W\SH 'HVLJQDWLRQ#RI#3DFNLQJ#W\SH F $=#7DSLQJ &=#$QWLVWDWLF#EDJ#RQO\#IRU#VDPSOHV G 'HVLJQDWLRQ#RI#7DSLQJ#W\SH ([1#75/#7/#+UHIHU#WR#7DSLQJ#6SHFLILFDWLRQV/#75#W\SH#LV#SUHVFULEHG#DV#D#VWDQGDUG1, Contents
2
RN5RF
PIN CONFIGURATION
SOT-23-5
5 4
CE/CE (mark side) GND VDD
EXT
VOUT
1
2
3
PIN DESCRIPTION
Pin No. 4 5 6 7 8 Symbol *1' 9'' 9287 (;7 &(#RU#&( *URXQG#3LQ ,QSXW#3LQ 2XWSXW#3LQ ([WHUQDO#7UDQVLVWRU#'ULYH#3LQ#+&026#2XWSXW, &KLS#(QDEOH#3LQ Pin Description
ABSOLUTE MAXIMUM RATINGS
Symbol 9,1 9&( 9(;7 ,(;7 3' 7RSW 7VWJ ,QSXW#9ROWDJH ,QSXW#9ROWDJH#IRU#&(2&(#3LQ (;7#2XWSXW#9ROWDJH (;7#2XWSXW#&XUUHQW 3RZHU#'LVVLSDWLRQ 2SHUDWLQJ#7HPSHUDWXUH#5DQJH 6WRUDJH#7HPSHUDWXUH#5DQJH Item Rating 45 0316#WR#9,1#.316 45 83 483 073#WR#.;8 088#WR#.458 Unit 9 9 9 P$ P: & &
ABSOLUTE MAXIMUM RATINGS $EVROXWH#0D[LPXP#UDWLQJV#DUH#WKUHVKROG#OLPLW#YDOXHV#WKDW#PXVW#QRW#EH#H[FHHGHG#HYHQ#IRU#DQ#LQVWDQW#XQGHU#DQ\#FRQ0 GLWLRQV1#0RUHRYHU/#VXFK#YDOXHV#IRU#DQ\#WZR#LWHPV#PXVW#QRW#EH#UHDFKHG#VLPXOWDQHRXVO\1#2SHUDWLRQ#DERYH#WKHVH#DEVR0 OXWH#PD[LPXP#UDWLQJV#PD\#FDXVH#GHJUDGDWLRQ#RU#SHUPDQHQW#GDPDJH#WR#WKH#GHYLFH1#7KHVH#DUH#VWUHVV#UDWLQJV#RQO\#DQG GR#QRW#QHFHVVDULO\#LPSO\#IXQFWLRQDO#RSHUDWLRQ#EHORZ#WKHVH#OLPLWV1
3
RN5RF
ELECTRICAL CHARACTERISTICS
7RSW 58& Symbol 9287 ,287 ,(;7 92872,287 9',) ,66 ,VWDQGE\ ,(;7OHDN 928729,1 55 9,1 9(;7 928727RSW 538 9&(+ 9&(/ *1) *) Item 2XWSXW#9ROWDJH 2XWSXW#&XUUHQW (;7#&XUUHQW /RDG#5HJXODWLRQ 'URSRXW#9ROWDJH 6XSSO\#&XUUHQW 6WDQGE\#&XUUHQW (;7#/HDNDJH#&XUUHQW /LQH#5HJXODWLRQ 5LSSOH#5HMHFWLRQ ,QSXW#9ROWDJH (;7#2XWSXW#9ROWDJH 2XWSXW#9ROWDJH#7HPSHUDWXUH &RHIILFLHQW 3XOO#XS#UHVLVWDQFH#IRU#&(#SLQ &(#,QSXW#9ROWDJH#+ &(#,QSXW#9ROWDJH#/ 418 3 ,287 43P$ 073&7RSW;8& "433 7 9,1 3158 ,287 83P$ 9287.31899,1439 I 4N+]/#VLQXVRLGDO#3189S0S 9,109287 4139 3 3138 93 43 43 Conditions
9,109287 4139
MIN.
9287
TYP.
MAX.
9287
Unit 9 $
,287 83P$ 9,109287 4139 9,1 7139 /#9(;7 5139 9,109287 4139 4P$,287433P$ ,287 433P$/#,287 3P$ 9,109287 4139 9,1 43139
x31<; 413-4 8 093 314 63 3134 314 ;
x4135
48 93 315 83 413 318 3163
P$ P9 9 --$ --$ --$ (29 G% 9 9 SSP2& 0 9 9
The output current depends on the performance of external PNP transistor. Use External PNP transistor of a low saturation type, with an hFE between 100 and 300. With respect to Test Circuit, refer to Typical Application.
4
RN5RF
7RSW 58& Symbol 9287 ,287 ,(;7 92872,287 9',) ,66 ,VWDQGE\ ,(;7OHDN 92872V,1 55 9,1 9(;7 928727RSW 53' 9&(+ 9&(/ *1) *) Item 2XWSXW#9ROWDJH 2XWSXW#&XUUHQW (;7#&XUUHQW /RDG#5HJXODWLRQ 'URSRXW#9ROWDJH 6XSSO\#&XUUHQW 6WDQGE\#&XUUHQW (;7#/HDNDJH#&XUUHQW /LQH#5HJXODWLRQ 5LSSOH#5HMHFWLRQ ,QSXW#9ROWDJH (;7#2XWSXW#9ROWDJH 2XWSXW#9ROWDJH#7HPSHUDWXUH &RHIILFLHQW 3XOO#GRZQ#UHVLVWDQFH#IRU#&( SLQ &(#,QSXW#9ROWDJH#+ &(#,QSXW#9ROWDJH#/ 418 3 ,287 43P$ 073&7RSW;8& "433 7 9,1 3158 ,287 83P$ 9287.31899,1439 I 4N+]/#VLQXVRLGDO#3189S0S 9,19287 4139 3 3138 93 43 43 Conditions
9,109287 4139
MIN.
9287
TYP.
MAX.
9287
Unit 9 $
,287 83P$ 9,109287 4139 9,1 7139 /#9(;7 5139 9,109287 4139 4P$,287433P$ ,287 433P$ 9,19287 4139 ,287 3P$ 9,1 43139
x31<;
413-4 8 093 314 63 3134 314 ;
x4135
48 93 315 83 413 318 3163
P$ P9 9 --$ --$ --$ (29 G% 9 9 SSP2& 0 9 9
The output current depends on the performance of external PNP transistor. Use External PNP transistor of a low saturation type, with an hFE between 100 and 300. With respect to Test Circuit, refer to Typical Application.
5
RN5RF
OPERATION
PNP Tr
VDD
RN5RFxxA
4
EXT VOUT
IN
2
-
3
Ra
OUT
C
Vref CE
+
Rb
Current Limit GND
CL
GND
5
1
GND
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otes on selecting external components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
6
RN5RF
TEST CIRCUITS
PNP
PNP
4 IN VDD 2
EXT VOUT 3
IN ISS VDD 2
4
EXT VOUT 3 OUT
OUT IOUT 10F
RN5RFxxA 10F 1 GND 5 CE
RN5RFxxA 10F 1 GND 5 CE
10F
Basic Test Circuit
PNP
Test Circuit for Supply Current
PNP
4 IN VDD 2
EXT VOUT 3 OUT IOUT 10F 1
4 IN VDD 2
EXT VOUT 3 OUT
RN5RFxxA
RN5RFxxA 10F
10F 1 GND
P.G 5 CE
GND
5 CE
Test Circuit for Ripple Rejection and Line Transient Response
Test Circuit for Load Transient Response
7
RN5RF
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Input Voltage (Topt=25C) RN5RF30A
3.20 5.20
RN5RF50A
Output Voltage VOUT(V)
2.80 2.60 IOUT=0mA 2.40 2.20 2.00 2 3 4 5 6 7 8 9 10 IOUT=100mA IOUT=500mA
Output Voltage VOUT(V)
3.00
5.00 4.80 4.60 IOUT=0mA 4.40 4.20 4.00 4 5 6 7 8 9 10 IOUT=100mA IOUT=500mA
Input Voltage VIN(V)
Input Voltage VIN(V)
2)
Output Voltage vs. Output Current (Topt=25C) RN5RF30A
3.10 VIN=4V 5.10
RN5RF50A
VIN=6V
Output Voltage VOUT(V)
3.00 2.95 2.90 2.85 2.80 0 100 200 300 400 500
Output Voltage VOUT(V)
3.05
5.05 5.00 4.95 4.90 4.85 4.80 0 100 200 300 400 500
Output Current IOUT(mA)
Output Current IOUT(mA)
3)
Dropout Voltage vs. Output Current RN5RF30A
0.50 Topt=-40 0.50 Topt=-40 Topt=25 Topt=85 0.30 0.20 0.10 0.00 0 100 200 300 400 500
RN5RF50A
Dropout Voltage VDIF(V)
Dropout Voltage VDIF(V)
0.40
0.40 0.30 0.20 0.10 0.00 0 100
Topt=25 Topt=85
200
300
400
500
Output Current IOUT(mA)
Output Current IOUT(mA)
8
RN5RF
4)
Output Voltage vs. Temperature RN5RF30A
3.10 VIN=4V,IOUT=10mA 5.10
RN5RF50A
VIN=6V,IOUT=10mA
Output Voltage VOUT(V)
3.05
Output Voltage VOUT(V)
5.05
3.00
5.00
2.95
4.95
2.90 -50
-25
0
25
50
75
100
4.90 -50
-25
0
25
50
75
100
Temperature Topt( )
Temperature Topt( )
5)
Supply Current vs. Input Voltage (Topt=25C) RN5RF30A
100 90 IOUT=0mA 100 90
RN5RF50A
IOUT=0mA
Supply Current ISS(A)
80 70 60 50 40 30 20 10 0 0 2 4 6 8 10
Supply Current ISS(A)
80 70 60 50 40 30 20 10 0 0 2 4 6 8 10
Input Voltage VIN(V)
Input Voltage VIN(V)
6)
Supply Current vs. Temperature RN5RF30A
50 VIN=4V,IOUT=0mA 50
RN5RF50A
VIN=6V,IOUT=0mA
Supply Current ISS(A)
40 30 20 10 0 -50
Supply Current ISS(A)
-25 0 25 50 75 100
40 30 20 10 0 -50
-25
0
25
50
75
100
Temperature Topt( )
Temperature Topt( )
9
RN5RF
7)
Ripple Rejection vs. Frequency (Topt=25C) RN5RF30A
80 70 VIN=4Vdc+0.5Vp-p,IOUT=100mA,CL=10F 80 70
RN5RF50A
VIN=6Vdc+0.5Vp-p,IOUT=100mA,CL=10F
Ripple Rejection (dB)
60 50 40 30 20 10 0 0.01 0.1 1 10 100
Ripple Rejection (dB)
60 50 40 30 20 10 0 0.01 0.1 1 10 100
Frequency (kHz)
Frequency (kHz)
8)
Line Transient Response (Topt=25C) RN5RF30A
6 5 IOUT=300mA,CL=10F 3.3 8
RN5RF50A
IOUT=300mA,CL=10F 5.3
Input Voltage
Output Voltage VOUT(V)
4 3
3.1 3
6 5 4 3 2 -50 -25
5.1 5
Output Voltage
2 1 0 -50 -25 2.9 2.8 2.7 100 125 150
Output Voltage
4.9 4.8
0
25
50
75
0
25
50
75
4.7 100 125 150
Time T(s)
Time T(s)
9)
Load Transient Response (Topt=25C) RN5RF30A
200 VIN=4V,CL=10F 3.3 200
RN5RF50A
VIN=6V,CL=10F 5.3
Output Current IOUT(mA)
Output Voltage VOUT(V)
0 -100
Output Current
3.1 3
0 -100
Output Current
5.1 5
Output Voltage
-200 -300 -400 -100 2.9 2.8 2.7 400
Output Voltage
-200 -300 -400 -100 4.9 4.8 4.7 400
0
100
200
300
0
100
200
300
Time T(s)
Time T(s)
10
Output Voltage VOUT(V)
100
3.2
Output Current IOUT(mA)
100
5.2
Output Voltage VOUT(V)
3.2
7
Input Voltage
5.2
Input Voltage VIN(V)
Input Voltage VIN(V)
RN5RF
TYPICAL APPLICATION
PNP Tr
EXT
IN + Cap.
VDD
RN5RFxxA
VOUT + Cap.
OUT
CE
GND
11

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