NJM2857 - 1 - ver.2010-02-08 low dropout voltage regulator general description package outline the NJM2857 is a low dropout voltage regulator. this product has reverse current protection without external sbd advanced bipolar technology ac hieves low noise, high ripple rejection and high supply voltage. 1.5a output current capacity, 4.7 f small decoupling capacitor, built-in noise bypass capacitor make the NJM2857 suitable for various applications . features high ripple rejection 80db typ. (f=1khz, vo=3v version) output noise voltage vno=55 vrms typ. (vo=3v version) output capacitor with ceramic capacitor output current io(max.)=1.5a high precision output vo 1.0% low dropout voltage 0.20v typ. (io=1a) on/off control internal reverse current protection internal thermal overload protection internal over current protection bipolar technology package outline to-252-5 pin configuration NJM2857dl3 equivalent circuit control v out gnd v in bandgap reference thermal protection current limit reverse current protection 1.control 2.v in 3.gnd 4.vo 5.n.c. 1 2 3 4 5 3 NJM2857dl3
NJM2857 - 2 - ver.2010-02-08 output voltage device name v out NJM2857dl3-15 1.5v NJM2857dl3-25 2.5v NJM2857dl3-03 3.0v NJM2857dl3-33 3.3v NJM2857dl3-05 5.0v output voltage options available : 1.5 ~ 5.0v (0.1v step) absolute maximum ratings (ta=25 c) parameter symbol ratings unit input voltage v in +10 v control voltage v cont +10 v output terminal voltage v o.max vo+1 v power dissipation p d 1190(*1) 3125(*2) mw operating temperature topr -40 +85 c storage temperature tstg -40 +150 c (*1) : mounted on glass epoxy board. (76.2x 114.3x1. 6mm:eia/jdec standard size, 2layers, copper area 100mm 2 ) (*2) : mounted on glass epoxy board. (76.2x 114.3x1. 6mm:eia/jdec standard size, 4layers, copper area 100mm 2 ) (4layers inner foil : 74.2 x 74.2mm applying a thermal beer hall to a board based on jedec standard jesd51-5) operating voltage v in =+2.6v(in case of vo<2.4v) ~ +8v
NJM2857 - 3 - ver.2010-02-08 electrical characteristics (v in =vo+1v(vo<1.6v: v in =2.6v), c in =1.0 f, co=4.7 f(1.7v2v), io=30ma - - 0.10 %/v load regulation ? vo/ ? io io=0 1500ma - - 0.003 %/ma dropout voltage(*1) ? v i -o io=1000ma - 0.20 0.30 v vo=1.5v - 86 - vo=2.5v - 82 - vo=3.0v - 80 - vo=3.3v - 79 - ripple rejection(*2) rr ein=200mvrms, f=1khz, io=10ma vo=5.0v - 78 - db average temperature coefficient of output voltage ? vo/ ? ta ta = 0 85 c, io=10ma - 50 - ppm/ c vo=1.5v - 26 - vo=2.5v - 41 - vo=3.0v - 47 - vo=3.3v - 51 - output noise voltage v no f=10hz 80khz, io=10ma, vo=5.0v - 69 - vrms control current i cont v cont =1.6v - 3 12 a control voltage for on-state v cont(on) 1.6 - - v control voltage for off-state v cont(off) - - 0.6 v (*1): the output voltage excludes under 2.4v (*2): vo>2.0v:v in =vo+1v, vo 2.0v:v in =3.0v the above specification is a common spec ification for all output voltages. therefore, it may be different from the indivi dual specification for a specific output voltage. power dissipation vs. ambient temperature NJM2857dl3 powerdissipation (topr=-40~+85c,tj=150c) 0 500 1000 1500 2000 2500 3000 3500 -50 -25 0 25 50 75 100 temperature : ta(c) power dissipation p d (mw) on 4 layers board on 2 layers board
NJM2857 - 4 - ver.2010-02-08 test circuit NJM2857 v in v in v out control gnd 1.0f i in i cont v cont i out v out v v a a (*3) 4.7f (ceramic) (*3) 1.7v NJM2857 - 5 - ver.2010-02-08 typical applications 1 in the case where on/off control is not required: NJM2857 v in v out control gnd 1.0f v out v in (*4) 4.7f (*4) 1.7vNJM2857 v in v out control gnd 1.0f v out v in r (*4) 4.7f (*4) 1.7v NJM2857 - 6 - ver.2010-02-08 *input capacitance c in input capacitance c in is required to prevent oscillation and reduce po wer supply ripple for applications with high power supply impedance or a long power supply line. you should use the c in value of 0.1f larger to avoid the problem. c in should connect between gnd and v in as shortest path as possible. *output capacitance co output capacitor (co) will be required for a phase co mpensation of the internal error amplifier. the capacitance and the equivalent se ries resistance (esr) influence to stable operation of the regulator. this product is designed to work with a low esr capacitor (co). however use of recommended capacitance or larger value is effective for stable operation. use of a smaller co may cause excess output noise or oscillation of the regulator due to lack of the phase compensation. therefore use co with the recommended capacitance or la rger value and connect between vo terminal and gnd terminal with shortest path. the recommended capacita nce depends on the output voltage rank. low voltage regulator requires larger value co. thus, check the recommended capacitance for each output voltage rank. use of a larger co reduces output noise and ripple output, and also improves output transient response against rapid load change. *reverse current protection a reverse current protection circuit is built-in to this product and prevents a current inflow from an output terminal to the input terminal when the input terminal voltage became lower than the output terminal voltage. when a regulator is controlled by off (v cont <0.6v), the reverse current protection circuit functions.
NJM2857 - 7 - ver.2010-02-08 typical characteristics 1 2 3 4 5 6 123456 input voltage : v in (v) NJM2857_5.0v output voltage vs. input voltage @:ta=25 o c co=4.7uf(ceramic) cin=1.0uf(ceramic) 0ma 500ma 1500ma 2000ma 0 20 40 60 80 100 0 500 1000 1500 2000 NJM2857_5.0v ground pin current vs. output current @:ta=25 o c v in =6.0v co=4.7uf(ceramic) output current : i o (ma) 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0 500 1000 1500 2000 output current:io(ma) @:ta=25 o c co=2.2uf (ceramic) NJM2857_5.0v dropout voltage vs. output current 0 5 10 15 20 00.511.522.533.54 control voltage : v cont (v) NJM2857_5.0v control current vs. control voltage @:ta=25 o c vin=6.0v co=4.7uf(ceramic) rc=0 rc=50k rc=100k 0 1 2 3 4 5 6 00.511.52 NJM2857_5.0v output voltage vs. control voltage @:ta=25 o c vin=6.0v co=2.2uf(ceramic) io=30ma rc=0 rc=50k rc=100k 0 1 2 3 4 5 6 0 500 1000 1500 2000 2500 3000 NJM2857_5.0v output voltage vs. output current @:ta=25 o c vin=6v co=4.7uf(ceramic) output current : io(ma)
NJM2857 - 8 - ver.2010-02-08 -100 -80 -60 -40 -20 0 0 400 800 1200 1600 2000 2400 output current : io(ma) NJM2857_5.0v load regulation vs. output current @:ta=25 o c v in=6.0v co=4.7uf(ceramic) 0 400 800 1200 1600 2000 2400 2800 3200 5678910 NJM2857_5.0v peak output current vs. input voltage @:ta=25 o c co=2.2uf(ceramic) input voltage : v in (v) 0 5000 10000 15000 20000 25000 30000 0246810 @:ta=25 o c output : no load. co=4.7uf(ceramic) including icont input voltage : v in (v) NJM2857_5.0v quiescent current vs. input voltage 0 20 40 60 80 100 0.001 0.01 0.1 1 10 100 1000 output current : io(ma) NJM2857_5.0v output noise voltage vs. output current @:ta=25 o c v in =6.0v lpf:80khz co=4.7uf(ceramic) 20 30 40 50 60 70 80 90 100 0.001 0.01 0.1 1 10 100 1000 output current : io(ma) NJM2857_5.0v ripple rejection vs. output current f=1khz f=10khz @:ta=25 o c v in =6v ein=200mvrms co=4.7uf(ceramic) 20 30 40 50 60 70 80 90 100 frequency : f (hz) NJM2857_5.0v ripple rejection ratio vs. frequency io=0ma io=10ma @:ta=25 o c vin=6v ein=200mvrms co=2.2uf(ceramic) 10 100 1k 10k 100k io=1000ma io=1500ma io=30ma io=500ma
NJM2857 - 9 - ver.2010-02-08 0.1 1 10 100 0.001 0.01 0.1 1 10 100 10 3 output current : io(ma) @ :ta=25 o c co=4.7uf(ceramic) vin=vo+1v NJM2857_5.0v equivalent serise resistance vs. output current 0.02 stable region 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 -50 0 50 100 150 NJM2857_5.0v dropout voltage vs. temperature temperature : ta ( o c) @:io =1000ma co=4.7uf(ceramic) 4.8 4.85 4.9 4.95 5 5.05 5.1 -50 0 50 100 150 NJM2857_5.0v output voltage vs. temperature temperature : ta ( o c) @:v in =6.0v io=30ma co=4.7uf(ceramic) 0 0.5 1 1.5 2 -50 0 50 100 150 @:v in =6.0v io=30ma co=4.7uf(ceramic) temperature : ta ( o c) NJM2857_5.0v control voltage vs. temperature 0 10 20 30 40 50 60 -50 0 50 100 150 NJM2857_5.0v control current vs. temperature temperature : ta ( o c) @:v in =6.0v output : no load co=4.7uf vcont=1.6v 0 100 200 300 400 500 600 -50 0 50 100 150 NJM2857_5.0v quiescent current vs. input voltage temperature : ta ( o c) @:v in =6.0v output : no load icont : excluded co=4.7uf
NJM2857 - 10 - ver.2010-02-08 -0.1 -0.05 0 0.05 0.1 -50 0 50 100 150 NJM2857_5.0v line regulation vs. temperature @:v in =6.0-8.0v io=30ma co=4.7uf(ceramic) temperature : ta ( o c) 0 200 400 600 800 1000 -50 0 50 100 150 NJM2857_5.0v short circuit current vs. temperature temperature : ta ( o c) @: v in =6.0v output is short to ground co=4.7uf(ceram ic) 0 0.002 0.004 0.006 0.008 0.01 -50 0 50 100 150 NJM2857_5.0v load regulation vs. temperature temperature : ta ( o c) @:v in =6.0v io=0-1500m a co=4.7uf(ceramic) 0 500 1000 1500 2000 2500 3000 3500 -50 0 50 100 150 temperature : ta ( o c) NJM2857_5.0v output peak current vs. temperature @:vin=6.0v co=4.7uf(ceramic) cin=1uf(ceramic) 0 1 2 3 4 5 6 -50 0 50 100 150 200 NJM2857_5.0v output voltage vs. temperature temperature : ta ( o c) @:v in =6.0v io=30ma co=4.7uf
NJM2857 - 11 - ver.2010-02-08 [caution] the specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. 0 0-28 output volatage:vo(v) 123 6 3 1 2 7 5 time:t(s) 4 -13 7.5 -18 2.5 -2.5 -7.5 -23 -33 5 4 -1 control voltage:vcont(v) NJM2857_5.0v on/off transient response without load control voltage output voltage @:ta=25c vin=6v io=0ma co=4.7uf 0 -1 control voltage:vcont(v) 20 4 time:t(ms) 16 -13 7.5 -18 2.5 -2.5 -7.5 -23 -33 output voltage:vo(v) 4812 6 3 1 2 7 5 0-28 NJM2857_5.0v on/off transient response control voltage output voltage @:ta=25c vin=6v io=30ma co=4.7uf -2500 0 5.40 5.30 5.20 5.10 5.00 4.90 4.80 -2000 output currentio(ma) time:t(s) 160 200 1000 500 40 80 120 0 NJM2857_5.0v load transient response 4.70 5.50 output voltage:vo(v) 1500 -500 -1000 -1500 output current output voltage @:ta=25c vin=6v io=0- 1000ma 0 0 5.15 5.10 4.90 160 4.85 NJM2857_5.0v i npu t t rans i en t r esponse 200 8 3 7 6 5 1 4 time:t(s) output voltage:vo(v) 40 80 120 5.20 5.05 4.95 5.00 5.25 input voltage:vin(v) 2 input voltage output voltage @:ta=25c io=30ma co=4.7uf
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