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EA-058-0006 LOW NOISE 150mA LDO REGULATOR 544541#6(5,(6 OUTLINE 7KH#544541#6HULHV#DUH#YROWDJH#UHJXODWRU#,&V#ZLWK#KLJK#RXWSXW#YROWDJH#DFFXUDF\/#H[WUHPHO\#ORZ#VXSSO\#FXUUHQW/#ORZ 210UHVLVWDQFH#DQG#KLJK#5LSSOH#5HMHFWLRQ#E\#&026#SURFHVV1#(DFK#RI#WKHVH#YROWDJH#UHJXODWRU#,&V#FRQVLVWV#RI#D#YROWDJH UHIHUHQFH#XQLW/#DQ#HUURU#DPSOLILHU/#UHVLVWRUV/#D#FXUUHQW#OLPLW#FLUFXLW/#DQG#D#FKLS#HQDEOH#FLUFXLW1#7KHVH#,&V#SHUIRUP#ZLWK ORZ#GURSRXW#YROWDJH#DQG#D#FKLS#HQDEOH#IXQFWLRQ1 7KH# OLQH# WUDQVLHQW# UHVSRQVH# DQG# ORDG# WUDQVLHQW# UHVSRQVH# RI# WKH# 544541# 6HULHV# DUH# H[FHOOHQW/# WKXV# WKHVH# ,&V# DUH YHU\#VXLWDEOH#IRU#WKH#SRZHU#VXSSO\#IRU#KDQG0KHOG#FRPPXQLFDWLRQ#HTXLSPHQW1 7KH#RXWSXW#YROWDJH#RI#WKHVH#,&V#LV#IL[HG#ZLWK#KLJK#DFFXUDF\1 6LQFH#WKH#SDFNDJH#IRU#WKHVH#,&V#DUH#62705608#+0LQL0PROG,#SDFNDJH/#KLJK#GHQVLW\#PRXQWLQJ#RI#WKH#,&V#RQ#ERDUGV#LV SRVVLEOH1 FEATURES * 8OWUD0/RZ#6XSSO\#&XUUHQW 11111111111111111111111111111111111111111111111111 7<31#68$ * 6WDQGE\#0RGH 1111111111111111111111111111111111111111111111111111111111111111111111 7<31#314$ * /RZ#'URSRXW#9ROWDJH 1111111111111111111111111111111111111111111111111111111111 7<31#3159#+,287# #433P$, * +LJK#5LSSOH#5HMHFWLRQ 111111111111111111111111111111111111111111111111111111111 7<31#:3GE#+I# #4N+], * /RZ#7HPSHUDWXUH0'ULIW#&RHIILFLHQW#RI#2XWSXW#9ROWDJH111111 7<31#433SSP2& * ([FHOOHQW#/LQH#5HJXODWLRQ111111111111111111111111111111111111111111111111111 7<31#3138(29 * +LJK#$FFXUDF\#2XWSXW#9ROWDJH 1111111111111111111111111111111111111111111 513( * 6PDOO#3DFNDJH# 111111111111111111111111111111111111111111111111111111111111111111111 62705608#+0LQL0PROG, * 2XWSXW#9ROWDJH#11111111111111111111111111111111111111111111111111111111111111111111 6WHSZLVH#VHWWLQJ#ZLWK#D#VWHS#RI#3149#LQ#WKH#UDQJH#RI#4189#WR 8139#LV#SRVVLEOH1 * %XLOW0LQ#FKLS#HQDEOH#FLUFXLW#+5#7\SHV>#$=#DFWLYH#//#%=#DFWLYH#+, * 3LQRXW11111111111111111111111111111111111111111111111111111111111111111111111111111111111 6LPLODU#WR#WKH#7.445/#7.444 APPLICATIONS * 3RZHU#VRXUFH#IRU#FHOOXODU#SKRQHV#VXFK#DV#*60/#&'0$#DQG#YDULRXV#NLQG#RI#3&6V1 * 3RZHU#VRXUFH#IRU#GRPHVWLF#DSSOLDQFHV#VXFK#DV#FDPHUDV/#9&5V#DQG#FDPFRUGHUV1 * 3RZHU#VRXUFH#IRU#EDWWHU\0SRZHUHG#HTXLSPHQW1 1 R1121N BLOCK DIAGRAM R1121NXX1A R1121NXX1B 3 1 3 VOUT VDD VOUT VDD Vref Vref Current Limit CE 1 GND 4 CE 2 Current Limit 4 GND 2 SELECTION GUIDE 7KH#RXWSXW#YROWDJH/#WKH#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#= 54454;;;4;0;; 3DUW#1XPEHU D E F Code D Contents 6HWWLQJ#2XWSXW#9ROWDJH#+9287,#= 6WHSZLVH#VHWWLQJ#ZLWK#D#VWHS#RI#3149#LQ#WKH#UDQJH#RI#4189#WR#8139#LV#SRVVLEOH1 'HVLJQDWLRQ#RI#$FWLYH#7\SH#= E $#=#DFWLYH#/#W\SH %#=#DFWLYH#+#W\SH F 2 'HVLJQDWLRQ#RI#7DSLQJ#7\SH#= ([1#75/#7/#+UHIHU#WR#7DSLQJ#6SHFLILFDWLRQV>#75#W\SH#LV#WKH#VWDQGDUG#GLUHFWLRQ1, R1121N PIN CONFIGURATION SOT-23-5 5 4 NC CE (mark side) VOUT GND VDD 1 2 3 PIN DESCRIPTION Pin No. Symbol Description 4 9287 2XWSXW#SLQ 5 *1' *URXQG#3LQ 6 9'' ,QSXW#3LQ 7 &( #RU#&( &KLS#(QDEOH#3LQ 8 1& 1R#&RQQHFWLRQ ABSOLUTE MAXIMUM RATINGS Symbol Item Rating Unit < 9 9,1 ,QSXW#9ROWDJH 9&( ,QSXW#9ROWDJH#+&(#RU#&(#3LQ, 0316#a#9,1.316 9 9287 2XWSXW#9ROWDJH 0316a#9,1.316 9 583 P: 073#a#;8 & 088#a#458 & 3' 7RSW 7VWJ 3RZHU#'LVVLSDWLRQ 2SHUDWLQJ#7HPSHUDWXUH 5DQJH 6WRUDJH#7HPSHUDWXUH#5DQJH 3 R1121N ELECTRICAL CHARACTERISTICS * R1121NXX1A Symbol Item Conditions MIN. TYP. MAX. 9,1# #6HW#9287.49 9287 9287 4P$##,287##63P$ x31<; x4135 Unit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a#433N+] SSP 433 2& 83 8 9 P$ 43 0 418 9,1 9 3 3158 9 63 9UPV R1121N * R1121NXX1B 7RSW 58& Symbol Item 9287 2XWSXW#9ROWDJH ,287 2XWSXW#&XUUHQW 92872,287 /RDG#5HJXODWLRQ 9',) 'URSRXW#9ROWDJH ,66 6XSSO\#&XUUHQW ,VWDQGE\ 6XSSO\#&XUUHQW#+6WDQGE\, 928729,1 /LQH#5HJXODWLRQ 55 5LSSOH#5HMHFWLRQ 9,1 ,QSXW#9ROWDJH 928727 2XWSXW#9ROWDJH 7HPSHUDWXUH#&RHIILFLHQW Conditions MIN. TYP. MAX. 9,1# #6HW#9287.49 9287 9287 4P$##,287##63P$ x31<; x4135 Unit 9 UHIHU#WR#WKH#(/(&75,&$/#&+$5$&7(5,67,&6#E\#287387 92/7$*( 9,1# #6HW#9287.49 45 4P$##,287##;3P$ 73 09 UHIHU#WR#WKH#(/(&75,&$/#&+$5$&7(5,67,&6#E\#287387 92/7$*( 9,1# #6HW#9287.49 9,1# #6HW#9287.49 9&(# #*1' 6HW#9287.3189##9,1##;9 ,287# #63P$ I# #4.+]/#5LSSOH#3189S0S 68 :3 $ 314 413 $ 3138 3153 (29 :3 9,1# #6HW#9287.49 G% ; ,287# #63P$ ,OLP 6KRUW#&XUUHQW#/LPLW 9287# #39 53' &(#3XOO0GRZQ#5HVLVWDQFH 518 9&(+ &(#,QSXW#9ROWDJH#+ 9&(/ &(#,QSXW#9ROWDJH#/ HQ 2XWSXW#1RLVH %:# #43+]#a#433N+] SSP 433 073&##7RSW##;8& 2& 83 8 9 P$ 43 0 418 9,1 9 3 3158 9 63 9UPV 5 R1121N * ELECTRICAL CHARACTERISTICS by OUTPUT VOLTAGE 7RSW# #58& Output Current Output Voltage IOUT (mA) VOUT (V) Conditions 418##9287##41: 41;##9287##813 MIN. 433 9,1#0#9287# #4139 483 7RSW# #58& Dropout Voltage Output Voltage VDIF (V) VOUT (V) Conditions MIN. TYP. MAX. 3193 4173 3168 31:3 518##9287##51: 3157 3168 51;##9287##616 3153 3163 617##9287##813 314: 3159 418 318 419 317 41: 316 41;##9287##41< 513##9287##517 ,287# #433P$ 1RWH#=:KHQ#VHW#2XWSXW#9ROWDJH#LV#HTXDO#RU#OHVV#WKDQ#5139/#9,1#VKRXOG EH#HTXDO#RU#PRUH#WKDQ#51391 6 R1121N OPERATION R1121NXX1A 3 R1121NXX1B 1 3 VOUT VDD 1 VOUT VDD R1 R1 Vref Vref Current Limit CE 4 R2 GND 2 CE Current Limit 4 R2 GND 2 ,Q#WKHVH#,&V/#IOXFWXDWLRQ#RI#2XWSXW#9ROWDJH/#9287#LV#GHWHFWHG#E\#)HHG0EDFN#5HJLVWHUV/#54#DQG#55/#DQG#WKH#UHVXOW LV#FRPSDUHG#ZLWK#D#UHIHUHQFH#YROWDJH#E\#(UURU#$PSOLILHU/#VR#WKDW#D#FRQVWDQW#YROWDJH#LV#RXWSXW1 $#FXUUHQW#OLPLW#FLUFXLW#IRU#SURWHFWLRQ#DW#VKRUW#PRGH#DQG#D#FKLS#HQDEOH#FLUFXLW#DUH#LQFOXGHG1 7 R1121N TEST CIRCUITS CE CE 4 IN VDD 3 4 VOUT R1121Nxx1B Series 1 OUT IOUT VOUT VDD 3 IN R1121Nxx1B Series ISS 2.2F 2.2F 2 2 GND 0.1F GND 0.1F Standard test Circuit Supply current Test Circuit Fig.1 Standard test Circuit Fig.2 Supply Current Test Circuit CE CE 4 4 IN VDD 3 OUT 1 VOUT R1121Nxx1B Series 1 OUT IN VDD 3 VOUT R1121Nxx1B Series OUT 1 IOUT P.G 2 2 GND Ripple Rejection, Line Transient Response Test Circuit Fig.3 Ripple Rejection, Line Transient Response Test Circuit 8 1F GND I1 I2 Load Transient Response Test Circuit Fig.4 Load Transient Response Test Circuit R1121N TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current R1121N181B R1121N301B Topt = 25C Topt = 25C 3.5 2.0 5.0V 3.0 3.8V 1.6 Output Voltage VOUT (V) Output Voltage VOUT (V) 1.8 2.8V 1.4 1.2 2.3V 1.0 0.8 0.6 VIN = 2.1V 0.4 4.0V 2.5 2.0 3.5V 1.5 VIN = 3.3V 1.0 0.5 0.2 0.0 0 100 200 300 400 Output Current IOUT (mA) 0.0 500 0 100 R1121N401B 200 300 400 Output Current IOUT (mA) 500 R1121N501B Topt = 25C Topt = 25C 5.0 6.0 5.0 4.0 Output Voltage VOUT (V) Output Voltage VOUT (V) 4.5 6.0V 3.5 5.0V 3.0 2.5 4.5V 2.0 VIN = 4.3V 1.5 1.0 7.0V 4.0 6.0V 3.0 5.5V 2.0 VIN = 5.3V 1.0 0.5 0.0 0.0 0 200 300 400 Output Current IOUT (mA) 0 500 100 200 300 400 Output Current IOUT (mA) 500 Output Voltage vs. Input Voltage R1121N181B R1121N301B Topt = 25C Topt = 25C 3.1 2.0 IOUT=1mA 1.9 3.0 IOUT = 1mA Output Voltage VOUT (V) Output Voltage VOUT (V) 2) 100 1.8 1.7 1.6 1.5 1.4 30mA 2.9 2.8 2.7 30mA 2.6 1.3 50mA 1.2 1.0 2.0 3.0 4.0 5.0 6.0 Input Voltage VIN (V) 7.0 8.0 2.5 2.0 50mA 3.0 4.0 5.0 6.0 Input Voltage VIN (V) 7.0 8.0 9 R1121N R1121N401B R1121N501B Topt = 25C Topt = 25C 4.5 5.5 5.0 Output Voltage VOUT (V) OUtput Voltage VOUT (V) IOUT = 1mA 4.0 3.5 30mA 3.0 3) 3.0 4.0 3.5 30mA 3.0 50mA 2.5 2.0 IOUT = 1mA 4.5 50mA 4.0 5.0 6.0 Input Voltage VIN (V) 7.0 2.5 2.0 8.0 4.0 5.0 6.0 Input Voltage VIN (V) 7.0 8.0 Dropout Voltage vs. Output Current R1121N181B R1121N301B 1.20 0.40 0.35 Topt = 85C 0.80 0.60 25C 0.40 -40C Dropout Voltage VDIF (V) Dropout Voltage VDIF (V) 1.00 0.20 Topt = 85C 0.30 25C 0.25 0.20 -40C 0.15 0.10 0.05 0.00 0 50 100 Output Current IOUT (mA) 0.00 150 0 0.40 0.35 0.35 0.30 Topt = 85C 0.25 25C 0.20 0.15 -40C 0.10 50 100 Output Current IOUT (mA) 150 R1121N501B 0.40 0.05 Dropout Voltage VDIF (V) Dropout Voltage VDIF (V) R1121N401B 0.30 Topt = 85C 0.25 25C 0.20 0.15 -40C 0.10 0.05 0.00 0 10 3.0 50 100 Output Current IOUT (mA) 150 0.00 0 50 100 Output Current IOUT (mA) 150 R1121N 4) Output Voltage vs. Temperature R1121N181B 1.90 1.88 3.08 1.86 3.06 1.84 1.82 1.80 1.78 1.76 1.74 3.04 3.02 3.00 2.98 2.96 2.94 2.92 1.72 1.70 -50 VIN = 4.0V IOUT = 30mA 3.10 Output Voltage VOUT (V) Output Voltage VOUT (V) R1121N301B VIN = 2.8V IOUT = 30mA -25 0 25 50 Temperature Topt (C) 75 2.90 -50 100 -25 R1121N401B 5.10 4.08 5.08 4.06 5.06 100 4.04 4.02 4.00 3.98 3.96 5.04 5.02 5.00 4.98 4.96 3.94 4.94 3.92 4.92 0 25 50 Temperature Topt (C) 75 4.90 -50 100 VIN = 6.0V IOUT = 30mA -25 0 25 50 Tempareture Topt (C) 75 100 Supply Current vs. Input Voltage R1121N181B R1121N301B Topt = 25C Topt = 25C 60 60 50 50 Supply Current ISS (A) Supply Current ISS (A) 5) Output Voltage VOUT (V) Output Voltage VOUT (V) 4.10 -25 75 R1121N501B VIN = 5.0V IOUT = 30mA 3.90 -50 0 25 50 Temperature Topt (C) 40 30 20 30 20 10 10 0 1.0 40 2.0 3.0 4.0 5.0 6.0 Input Voltage VIN (V) 7.0 8.0 0 1.0 2.0 3.0 4.0 5.0 6.0 Input Voltage VIN (V) 7.0 8.0 11 R1121N R1121N401B R1121N501B Topt = 25C 60 60 50 50 Supply Current ISS (A) Supply Current ISS (A) Topt = 25C 40 30 20 10 0 1.0 6) 40 30 20 10 2.0 3.0 4.0 5.0 6.0 Input Voltage VIN (V) 7.0 0 1.0 8.0 2.0 3.0 4.0 5.0 6.0 Input Voltage VIN (V) 8.0 Supply Current vs. Temperature R1121N181B R1121N301B VIN = 4.0V 50 50 45 45 Supply Current ISS (A) Supply Current ISS (A) VIN = 2.8V 40 35 30 20 -50 40 35 30 25 25 0 50 Temperature Topt (C) 20 -50 100 R1121N401B 50 45 45 Supply Current ISS (A) Supply Current ISS (A) 100 VIN = 6.0V 50 40 35 30 25 20 -50 0 50 Temperature Topt (C) R1121N501B VIN = 5.0V 12 7.0 40 35 30 25 0 50 Temperature Topt (C) 100 20 -50 0 50 Temperature Topt (C) 100 R1121N 7) Dropout Voltage vs. Set Output Voltage R1121Nxx xx1B xx Topt = 25C 1.0 Dropout Voltage VDIF (V) 0.9 IOUT = 150mA IOUT = 100mA IOUT = 50mA IOUT = 30mA IOUT = 10mA 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.0 1.0 5.0 Ripple Rejection vs. Frequency R1121N181B R1121N181B VIN = 2.8VDC + 0.5Vp-p COUT = tantal 2.2F 80 80 70 70 Ripple Rejection RR (dB) Ripple Rejection RR (dB) VIN = 2.8VDC + 0.5Vp-p COUT = tantal 1.0F 60 50 40 IOUT = 1mA 30 IOUT = 30mA 20 IOUT = 50mA 10 0 0.1 1 10 Frequency f (kHz) 60 50 40 IOUT= 1mA 30 IOUT = 30mA 20 IOUT = 50mA 10 0 100 0.1 1 10 100 Frequency f (kHz) R1121N301B R1121N301B VIN = 4.0VDC + 0.5Vp-p COUT = tantal 1.0F VIN = 4.0VDC + 0.5Vp-p COUT = tantal 2.2F 80 80 70 70 Ripple Rejection RR (dB) Ripple Rejection RR (dB) 8) 2.0 3.0 4.0 Set Output Voltage Vreg (V) 60 50 40 IOUT = 1mA 30 IOUT = 30mA 20 IOUT = 50mA 10 0 60 50 40 IOUT = 1mA 30 IOUT = 30mA 20 IOUT = 50mA 10 0 0.1 1 10 Frequency f (kHz) 100 0.1 1 10 100 Frequency f (kHz) 13 R1121N R1121N401B R1121N401B VIN = 5.0VDC + 0.5Vp-p COUT = tantal 2.2F 80 80 70 70 Ripple Rejection RR (dB) Ripple Rejection RR (dB) VIN = 5.0VDC + 0.5Vp-p COUT = tantal 1.0F 60 50 IOUT= 1mA 40 30 IOUT = 30mA 20 IOUT = 50mA 10 50 40 IOUT = 1mA 30 IOUT = 30mA 20 IOUT = 50mA 10 0 0 0.1 9) 60 1 10 Frequency f (kHz) 0.1 100 1 100 Ripple Rejection vs. Input Voltage (DC bias) R1121N301B R1121N301B IOUT = 10mA COUT = 2.2F 80 80 70 70 Ripple Rejection RR (dB) Ripple Rejection RR (dB) IOUT = 1mA COUT = 2.2F 60 50 40 f = 400Hz 30 20 f = 1kHz 10 f = 10kHz 0 3.2 3.3 3.4 Input Voltage VIN (V) 3.5 R1121N301B IOUT = 50mA COUT = 2.2F 80 f = 400Hz 70 Ripple Rejection RR (dB) 60 50 40 f = 400Hz 30 20 f = 1kHz 10 f = 10kHz 0 3.1 f = 1kHz 60 50 f = 10kHz 40 30 20 10 0 3.1 3.2 3.3 Input Voltage VIN (V) 14 10 Frequency f (kHz) 3.4 3.5 3.1 3.2 3.3 3.4 Input Voltage VIN (V) 3.5 R1121N 10) Line Transient Response R1121N301B IOUT=30mA tr=tf=5 s COUT=Tantalum 1.0F OUtput Voltage VOUT (V) 3.3 5 Input Voltage 4 3.2 3.1 3 Output Voltage 3.0 2 2.9 1 Input Voltage VIN (V) 6 3.4 0 2.8 0 20 40 60 TIme t (s) 80 100 120 R1121N301B IOUT=30mA tr=tf=5 s COUT=Tantalum 2.2F Output Voltage VOUT (V) 3.3 5 Input Voltage 4 3.2 3.1 3 Output Voltage 3.0 2 2.9 1 Input Voltage VIN (V) 6 3.4 0 2.8 0 20 40 60 Time t (s) 80 100 120 R1121N301B IOUT=30mA tr=tf=5 s COUT=Tantalum 6.8F Output Voltage VOUT (V) 3.3 5 Input Voltage 4 3.2 3 3.1 Output Voltage 3.0 2 2.9 1 Input Voltage VIN (V) 6 3.4 0 2.8 0 20 40 60 Time t (s) 80 100 120 15 R1121N 11) Load Transient Response R1121N301B VIN=4V CIN=Tantalum 1F COUT=Tantalum 1.0F Output Voltage VOUT (V) 3.3 100 Output Current 50 3.2 0 3.1 Output Voltage 3.0 -50 2.9 -100 Output Current IOUT (mA) 150 3.4 -150 2.8 0 2 4 6 8 10 12 Time t (s) 14 16 18 20 R1121N301B VIN=4V CIN=Tantalum 1F COUT=Tantalum 2.2F Output Voltage VOUT (V) 3.3 100 Output Current 50 3.2 0 3.1 Output Voltage 3.0 -50 2.9 -100 Output Current IOUT (mA) 150 3.4 -150 2.8 0 2 4 6 8 10 12 Time t (s) 14 16 18 20 R1121N301B VIN=4V CIN=Tantalum 1F COUT=Tantalum 6.8F Output Voltage VOUT (V) 3.3 100 Output Current 50 3.2 0 3.1 Output Voltage 3.0 -50 2.9 -100 -150 2.8 0 16 2 4 6 8 10 12 Time t (s) 14 16 18 20 Output Current IOUT (mA) 150 3.4 R1121N TECHNICAL NOTES :KHQ#XVLQJ#WKHVH#,&V/#EH#VXUH#WR#FRQVLGHU#IROORZLQJ#SRLQWV= * ,Q#WKHVH#,&V/#SKDVH#FRPSHQVDWLRQ#LV#PDGH#IRU#VHFXULQJ#VWDEOH#RSHUDWLRQ#HYHQ#LI#WKH#ORDG#FXUUHQW#LV#YDULHG1#)RU#WKLV SXUSRVH/# EH# VXUH# WR# XVH# D# FDSDFLWRU# &287# ZLWK# JRRG# IUHTXHQF\# FKDUDFWHULVWLFV# DQG# (65# +(TXLYDOHQW# 6HULHV# 5HVLV0 WDQFH,#RI#ZKLFK#LV#LQ#WKH#UDQJH#GHVFULEHG#DV#IROORZV= 4 CE Vout 1 R1121N301B 3 Vin Vin 2 GND Ceramic Capacitor Spectrum S.A. Analyzer ESR Iout Ceramic Capacitor 1F Measuring Circuit for white noise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eramic 1.0F Ceramic 2.2F 100.0 100.0 10.0 ESR ( ESR ( ) ) 10.0 1.0 1.0 0.1 0 50 100 Output Current IOUT (mA) 150 0.1 0 50 100 Output Current IOUT (mA) 150 17 R1121N * 0DNH#9''#DQG#*1'#OLQH#VXIILFLHQW1#:KHQ#WKH#LPSHGDQFH#RI#WKHVH#LV#KLJK/#WKHUH#LV#D#FDVH#WR#SLFN#XS#WKH#QRLVH#RU#QRW WR#ZRUN#FRUUHFWO\1 * &RQQHFW#WKH#FDSDFLWRU#ZLWK#D#FDSDFLWDQFH#RI#4)#RU#PRUH#EHWZHHQ#9''#DQG#*1'#DV#FORVH#DV#SRVVLEOH1 * 6HW#H[WHUQDO#FRPSRQHQWV/#HVSHFLDOO\#2XWSXW#&DSDFLWRU/#DV#FORVH#DV#SRVVLEOH#WR#WKH#,&V#DQG#PDNH#ZLULQJ#VKRUWHVW1 TYPICAL APPLICATION CE CE IN Cap. 18 VDD R1121NXX1A VOUT GND OUT Cap. IN Cap. VDD R1121Nxx1B VOUT GND OUT Cap.