627

05608 ＃ 3 ： 0 ＃ 6WHS0XS ＃ ' &2'&

&219(57(5

545431±±5±#6(5,(6

$33/,&$7,21#0$18$/

NO 。 EA- 064-0006

SOT- 23-5 PWM降压型DC / DC转换器

5454315#6(5,(6

概要

7KH ＃ 545431 ;; 5&2 ;; 5 ' ＃ 6HULHV ＃ DUH ＃ 3 ： 0 ＃ VWHS0XS ＃' &2'& ＃ &RQYHUWHU ＃ FRQWUROOHUV / ＃ ZLWK ＃ KLJK ＃ DFFXUDF \\ / ＃ ORZ ＃ VXSSO \\

FXUUHQW#E\#&026#SURFHVV1

(DFK#RI#WKH#545431;;5;#6HULHV#FRQVLVWV#RI#DQ#RVFLOODWRU/#D#3:0#FLUFXLW/#D#UHIHUHQFH#YROWDJH#XQLW/#DQ#HUURU#DPSOL0

ILHU/#SKDVH#FRPSHQVDWLRQ#FLUFXLW/#UHVLVWRUV#IRU#YROWDJH#GHWHFWLRQ/#D#FKLS#HQDEOH#FLUFXLW/#D#FRQWUROOHU#DJDLQVW#GUDVWLF#ORDG

WUDQVLHQW#DQG#DQ#RXWSXW#YROWDJH#GHWHFWRU1#$#ORZ#ULSSOH/#KLJK#HIILFLHQF\#VWHS0XS#'&2'&#FRQYHUWHU#FDQ#EH#FRPSRVHG#RI

WKLV#,&#ZLWK#RQO\#IRXU#H[WHUQDO#FRPSRQHQWV/#RU#DQ#LQGXFWRU/#D#GLRGH/#D#WUDQVLVWRU#DQG#D#FDSDFLWRU1

7KH#545431;;5;#6HULHV#FDQ#GHWHFW#GUDVWLF#FKDQJH#RI#RXWSXW#YROWDJH#ZLWK#D#FLUFXLW#FRQWUROOHU/#WKH#ORDG#WUDQVLHQW#UH0

VSRQVH#LV#LPSURYHG1

(DFK#RI#WKH#545431;;5;#6HULHV#KDV#D#GULYHU#SLQ/#RU#(;7·#SLQ#IRU#H[WHUQDO#WUDQVLVWRU1#%\#FRQQHFWLQJ#D#SRZHU#WUDQ0

VLVWRU#ZLWK#ORZ#210UHVLVWDQFH#WR#(;7#SLQ/#D#ODUJH#FXUUHQW#IORZV#WKURXJK#DQ#LQGXFWRU/#WKXV/#ODUJH#RXWSXW#FXUUHQW#FDQ#EH

VXSSOLHG1

7KH#EXLOW0LQ#FKLS#HQDEOH#FLUFXLW#FDQ#PDNH#WKH#VWDQGE\#PRGH#ZLWK#XOWUD#ORZ#TXLHVFHQW#FXUUHQW1

6LQFH#WKH#SDFNDJH#IRU#WKHVH#,&V#LV#VPDOO#62705608/#KLJK#GHQVLW\#PRXQWLQJ#RI#WKH#,&V#RQ#ERDUG#LV#SRVVLEOH1

特点

（ [ WHUQDO ＃ &RPSRQHQWV

111111111111111111111111111111111111111111111111111111111

2QO\#DQ#LQGXFWRU/#D#GLRGH/#D#FDSDFLWRU/#DQG#D#WUDQVLVWRU

6WDQGE\#&XUUHQW

111111111111111111111111111111111111111111111111111111111111111111

7<3

1#3—$

/ RZ ＃ 7HPSHUDWXUH0'ULIW ＃ &RHIILFLHQW ＃ RI ＃ 2XWSXW ＃ 9ROWDJH111111 7<3

1#“433SSP2°&

2XWSXW ＃ 9ROWDJH111111111111111111111111111111111111111111111111111111111111111111111 6WHSZLVH ＃ 6HWWLQJ ＃ ZLWK ＃ D＃ VWHS ＃ RI ＃ 3149 ＃ LQ ＃ WKH ＃ UDQJH ＃ RI ＃ 5159 ＃ WR

9139

7ZR#FKRLFHV#RI#%DVLF#2VFLOODWRU#)UHTXHQF\111111111111111111111111

433N+]#+;;5&,/#4;3N+]#+;;5',

6PDOO#3DFNDJH

1111111111111111111111111111111111111111111111111111111111111111111111

62705608#+0LQL0PROG,

/RZ#5LSSOH/#/RZ#1RLVH

2VFLOODWRU ＃ 6WDUW0XS ＃ 9ROWDJH11111111111111111111111111111111111111111111111111 0 $ ; 1 ＃ 31 ; 9

应用

3RZHU#VRXUFH#IRU#EDWWHU\0SRZHUHG#HTXLSPHQW1

3RZHU#VRXUFH#IRU#SRUWDEOH#FRPPXQLFDWLRQ#DSSOLDQFHV/#FDPHUDV/#9&5V

3RZHU#VRXUFH#IRU#DSSOLDQFHV#ZKLFK#UHTXLUH#KLJKHU#YROWDJH#WKDQ#EDWWHU\#YROWDJH1

1

R1210N××2×

框图

VREF电路

L

X

5

V

LX

Iimiter

卜FF器

PWM /控制器

OSC

相比较。

-

+

-

+

-

+

2

V

OUT

5

EXT

芯片使能

4

GND

1

CE

选购指南

,Q#WKH#545431#6HULHV/#WKH#RXWSXW#YROWDJH/#WKH#RVFLOODWRU#IUHTXHQF\/#WKH#RSWLRQDO#IXQFWLRQ/#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>

545431;;;;0;;

↑ ↑↑ ↑

EF摹

CODE

D

E

6HWWLQJ#2XWSXW#9ROWDJH+9

287

,=

6WHSZLVH#VHWWLQJ#ZLWK#D#VWHS#RI#3149#LQ#WKH#UDQJH#RI#5159#WR#9139

“ HVLJQDWLRQ ＃ RI ＃ ' ULYHU

5=#([WHUQDO#7U1#'ULYHU

'HVLJQDWLRQ#RI#2VFLOODWRU#)UHTXHQF\

F

&=#433N+]

'=#4;3N+]

'HVLJQDWLRQ#RI#7DSLQJ#7\SH>

G

([1=#75/#7/#+UHIHU#WR#7DSLQJ#6SHFLILFDWLRQ,

75#LV#SUHVFULEHG#DV#D#VWDQGDUG1

目录

2

R1210N××2×

引脚配置

SOT-23-5

5

4

EXT

（标记侧）

CE

V

OUT

GND

NC

1

2

3

引脚说明

PIN号

4

5

6

7

8

& （

9

287

1&

*1'

(;7

符号

描述

&KLS#(QDEOH#3LQ

3LQ#IRU#2XWSXW#9ROWDJH

1R#&RQQHFWLRQ

*URXQG#3LQ

([WHUQDO#7UDQVLVWRU#'ULYH#3LQ

绝对最大额定值

符号

9

287

9

(;7

9

& （

,

(;7

3'

7RSW

7VWJ

项

9

287

#3LQ#2XWSXW#9ROWDJH

(;7#3LQ#2XWSXW#9ROWDJH

&(#3LQ#,QSXW#9ROWDJH

(;7#3LQ#,QGXFWRU#'ULYH#2XWSXW#&XU0

UHQW

3RZHU#'LVVLSDWLRQ

2SHUDWLQJ#7HPSHUDWXUH#5DQJH

6WRUDJH#7HPSHUDWXUH#5DQJH

等级

＆ LT ;

03169

287

.316

＆ LT ;

±73

583

073.;8

088.458

单位

9

9

9

P$

P:

?? &

?? &

3

R1210N××2×

电气特性

R1210NXX2

符号

9

287

9

,1

9

287

27

9

67$57

项

2XWSXW#9ROWDJH

0D[LPXP#,QSXW#9ROWDJH

6WHS0XS#2XWSXW#9ROWDJH

7HPSHUDWXUH#&RHIILFLHQW

6WDUW0XS#9ROWDJH

073°&≤#7RSW#≤#;8°&

9

,1

39→59

43

,

''5

6XSSO\#&XUUHQW#5

9

287

9

& （

9

6(7

.3189

48

， VWDQGE \\

6XSSO\#&XUUHQW#6+6WDQGE\,

9

287

9189#9

& （

39

9

287

9

6(7

×31<9#(;7#DW#QR#ORDG

5159#≤#9VHW#≤#5179

4;

56

53

58

58

63

63

68

68

73

55

318

68

78

73

83

83

93

93

:3

:3

;3

±433

31;

48

条件

9

,1

9

6(7

×319/#,

287

4P$

分钟。

× 31< ： 8

典型值。

+ 7RSW 58与放大器;，

马克斯。

×41358

;

单位

9

9

SSP2

?? &

9

$

+[[5&,

$

+[[5',

$

$

+[[5&,

$

+[[5',

$

+[[5&,

$

+[[5',

$

+[[5&,

$

+[[5',

$

+[[5&,

$

+[[5',

$

+[[5&,

$

+[[5',

9

287

9

6(7

×31<9#(;7#DW#QR#ORDG

5189#≤#9VHW#≤#6139

,

''4

6XSSO\#&XUUHQW4

9

287

9

6(7

×31<9#(;7#DW#QR#ORDG

6149#≤#9VHW#≤#61<9

9

287

9

6(7

×31<9#(;7#DW#QR#ORDG

79#≤#9VHW#≤#7179

9

287

9

6(7

×31<9#(;7#DW#QR#ORDG

7189#≤#9VHW#≤#71<9

4