R5102V

/'2#5HJXODWRUV#ZLWK#D#:DWFKGRJ 7LPHU 584359#6(5,(6 $33/,&$7,21#0$18$/ NO. EA-072-0006 LDO Regulators with a Watchdog Timer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• %XLOW0LQ#D#ZDWFKGRJ#WLPHU • 7LPH#SHULRG#IRU#PRQLWRULQJ#DQG#JHQHUDWLQJ#D#UHVHW#VLJQDO#RI#WKH#ZDWFKGRJ#WLPHU#FDQ#EH#VHW#E\#DQ#H[WHUQDO#FDSDFLWRU • 5HJXODWRUV#FDQ#EH#VWRSSHG#LQGLYLGXDOO\#E\# &(4 #SLQ#DQG# &(5 #SLQ1 • /RZ#VXSSO\#FXUUHQW 111111111111111111111111111111111111111111111111111111+2SHUDWLQJ#0RGH,#7 W:5#+PV,#≈#W:'+PV,243 ~ :KHQ# &(4 #SLQ#YROWDJH#EHFRPHV#WR#HTXDO#RU#PRUH#WKDQ#4189 RU#FURVVHV#WKLV#OHYHO#IURP#´/µ#WR#´+µ,#DQG#RXWSXW#YROW0 /#+ DJH# OHYHO# RI# 9ROWDJH# 5HJXODWRU#4# EHFRPHV# WR# HTXDO# RU# OHVV# WKDQ#4189 ZDWFKGRJ# WLPHU# VWRSV# RSHUDWLRQ# DQG# 95(6(7 # EH0 /# FRPHV#WR#´/µ#OHYHO1  7KH#9ROWDJH#OHYHO#RI#&(4#SLQ#EHFRPHV#WR#HTXDO#RU#OHVV#WKDQ#31589#+RU#FURVVHV#WKLV#OHYHO#IURP#´+µ#WR# ´/ ,/#DQG#RXWSXW µ YROWDJH# RI# WKH# 9ROWDJH# 5HJXODWRU4# EHFRPHV# WR# HTXDO# RU# PRUH# WKDQ#4189 FKDUJLQJ# WR# DQ# H[WHUQDO# FDSDFLWRU# RI# &7:# SLQ /# VWDUWV#DQG#ZDWFKGRJ#WLPHU#RSHUDWHV/#WKXV#95(6(7 #EHFRPHV#WR#´+µ#OHYHO1 € :KHQ# D# 9ROWDJH# OHYHO# RI# 9''# SLQ# EHFRPHV# ORZHU# DQG# RXWSXW# YROWDJH# RI# 9ROWDJH# 5HJXODWRU#4# EHFRPHV# WR# HTXDO# RU# OHVV WKDQ#4189 WKH#ZDWFKGRJ#WLPHU#ZLOO#EH#KDOWHG#DQG#95(6(7 #EHFRPHV#WR#´/µ#OHYHO1 /# 11 R5102V APPLICATION NOTES Phase Compensation 3KDVH# FRPSHQVDWLRQ# RI# 954# LV# PDGH# E\# H[WHUQDO# FDSDFLWRU# WR# EH# VWDEOH# RSHUDWLRQ# XQGHU# YDULDEOH# RXWSXW# FXUUHQW1 7KHUHIRUH/#XVH#D#WDQWDOXP#FDSDFLWRU/#&//#ZLWK#D#YDOXH#DV#PXFK#DV#43—)#RU#PRUH#LQ#DQ\#FDVH1 ,I# WKH# YDOXH# RI# (65# ZLWK# WKH# FDSDFLWRU# LV# ODUJH/# ORRS# RVFLOODWLRQ# PLJKW# EH# RFFXUUHG# WR# WKH# RXWSXW1# 7R# DYRLG# WKH# FDVH/ FDUHIXO#HYDOXDWLRQ#LQFOXGLQJ#WKH#IUHTXHQF\#FKDUDFWHULVWLFV#LV#UHTXLUHG1 External PNP Transistor :KHQ#\RX#FKRRVH#WKH#H[WHUQDO#WUDQVLVWRU/#EDVLFDOO\#FRQVLGHU#RI#RXWSXW#FXUUHQW/#LQSXW#YROWDJH/#DQG#SRZHU#GLVVLSDWLRQ1 *HQHUDOO\/#WKH#WUDQVLVWRU#ZLWK#ORZ#9&(+6$7,#DQG#K)(#YDOXH#RI#ZKLFK#LV#LQ#WKH#UDQJH#RI#433#WR#633/#LV#DSSURSULDWH1 Mounting on Board 0DNH#WKH#LPSHGDQFH#EHWZHHQ#9''#DQG#*1'#PLQLPL]H/#RWKHUZLVH#ZKHQ#D#ODUJH#FXUUHQW#IORZV/#LW#ZRXOG#EH#D#FDXVH#RI PDNLQJ# QRLVH# DQG# XQVWDEOH# RSHUDWLRQ1# $QG# XVH# D# E\SDVV# FDSDFLWRU# ZLWK# D# YDOXH# DV# PXFK# DV#43—)# EHWZHHQ# 9''# SLQ# DQG *1'#SLQ#DQG#PDNH#LWV#ZLULQJ#VKRUW#DV#SRVVLEOH1 TYPICAL APPLICATION VDD 1 Voltage Regulator2 Voltage Regulator1 Watchdog Timer 10 GND ROUT2 2 9 CE1 EXT 3 8 CE2 ROUT1 4 7 CTW SCK 5 6 RESET 12