description the ams1085 is a positive low voltage dropout regulator, voltage dropout is only 1.18v at 3a. ams1085 has two versions: the fixed v ersion and the adjustable version. v out has a tol erance of less than 1% for fixed v ersions 1.5v, 1.8v, 2.5v, 3.3v, 5.0v and a djustable version. the ams1085 i ntegrates overheating protection and c urrent limit circuits. it is an suitable for all electronic products. features * 1% accuracy for fixed output v out whi le the voltage is 1.5v, 1.8v, 2.5v, 3.3v, 5.0v and the adjustable output v out * low dropout voltage: 1.18v at 3a output current * current limiting: 4.5a *load regulation : 0.1% typical (adjustable version) *line regulation : 0.015% typical (adjustable version) * t emperature range: 0 c to 125 c applications * high efficiency linear regulators * smps post-regulator * battery charger * microprocessor supply *desktop pcs, risc and embedded processors'supply ordering i nformatio n (temperature range: 0c ~125c)
ams1085d-adj ams1085cd ams1085d-adjtr ams1085cd ams1085d-1 .5 ams1085cd -1.5 ams1085d-1 .5tr ams1085cd- 1.5 ams1085d-1 .8 ams1085cd- 1.8 ams1085d-1 .8tr ams1085cd- 1.8 ams1085d-2 .5 ams1085cd- 2.5 ams1085d-2 .5tr ams1085cd- 2.5 ams1085d-3 .3 ams1085cd- 3.3 ams1085d-3 .3tr ams1085cd- 3.3 ams1085d-5 .0 ams1085cd- 5.0 ams1085d- 5.0tr t o-252-2l ams1085cd-5 .0 ams1085s-adj ams1085cm ams1085s-adjtr ams1085cm ams1085s-1.5 ams1085cm-1. 5 ams1085s-1.5 tr ams1085cm-1. 5 ams1085s-1.8 ams1085cm-1. 8 ams1085s-1.8 tr ams1085cm-1. 8 ams1085s-2.5 ams1085cm-2. 5 ams1085s-2.5 tr ams1085cm-2. 5 ams1085s-3.3 ams1085cm-3. 3 ams1085s-3.3 tr ams1085cms-3. 3 ams1085s-5.0 ams1085cm-5. 0 ams1085s-5. 0tr t o-263-3l ams1085cm-5.0 ams1085t-adj ams1085ct ams1085t-1.5 ams1085ct-1.5 ams1085t-1.8 ams1085ct-1.8 ams1085t-2.5 ams1085ct-2.5 ams1085t-3.3 ams1085ct-3.3 ams1085t-5.0 t o-220-3l ams1085ct-5.0 ams1085s2-adj ams1085cm ams1085s2-adjtr ams1085cm ams1085s2-1.5 ams1085cm-1.5 ams1085s2-1.5tr ams1085cm-1.5 ams1085s2-1.8 ams1085cm-1.8 ams1085s2-1.8tr ams1085cm-1.8 ams1085s2-2.5 t o-263-2l ams1085cm-2.5
ams1085s2-2.5tr ams1085cm-2.5 ams1085s2-3.3 ams1085cm-3.3 ams1085s2-3.3tr ams1085cm-3.3 ams1085s2-5.0 ams1085cm-5.0 ams1085s2-5.0tr t o-263-2l ams1085cm-5.0 v in adj/gnd band gap tsd current limit fixed adj v o a f1 f2 : f1 and f2 connect, disconnect a : a connect, f1 and f2 disconnect v in 20 v t lead 260 c t j 150 c t s -65 ~ +150 v pd mw esd 2000 v note1: the maximum allowable power dissipation is a function of maximum operating junction temperature t j (max) , the junction to ambient thermal resistance ja , and the ambient temperature t amb . the maximum allowable power dissipation at any ambient temperature is given: p d (max) = (t j (max) - t amb )/ ja, exceeding the maximum allowable power limit will result in excessive di e temperature; thus, the regulator will go into thermal shutdown. the junction to ambient thermal resistance ja of different packages may be different, and the he value of ja depends on mounting technique.
v in 12 v tj 0 ~ +125 c v ref ams1085-adj, i out =10ma, v in -v out =3v, 10ma i out 3a,1.5v v in -v out 5v 1.238 1.225 1.250 1.250 1.262 1.270 v ams1085-1.5, i out =10ma, v in =4.5v, 10ma i out 3a, 3.0v v in 6v 1.485 1.47 1.5 1.5 1.515 1.53 v ams1085-1.8, i out =10ma, v in =4.8v, 10ma i out 3a, 3.3v v in 6v 1.782 1.764 1.8 1.8 1.818 1.836 v ams1085-2.5, i out =10ma, v in =5.5v 10ma i out 3a, 4.0v v in 7v 2.475 2.45 2.5 2.5 2.525 2.55 v ams1085-3.3, i out =10ma, v in =6.3v, 10ma i out 3a, 4.8v v in 8v 3.267 3.234 3.3 3.3 3.333 3.366 v v out ams1085-5.0, i out =10ma, v in =8v, 10ma i out 3a, 6.5v v in 10v 4.95 4.9 5 5 5.05 5.1 v ams1085-adj, i out =10ma, 2.85v v in 10v 0.015 0.035 0.2 0.2 % ams1085-1.5, i out =10ma, 3.0v v in 10v 0.5 1 6 6 mv ams1085-1.8, i out =10ma, 3.3v v in 10v 0.5 1 6 6 mv ams1085-2.5, i out =10ma, 4.0v v in 10v 0.5 1 6 6 mv ams1085-3.3, i out =10ma, 4.8v v in 10v 0.5 1 6 6 mv v out ams1085-5.0, i out =10ma, 6.5v v in 10v 0.5 1 10 10 mv electrical characteristics (t amb =25c, unless otherwise specified. limits appearing in boldface type apply over the entire junction temperature range for operation, 0c to 125c. )
ams1085-adj, 0ma ?i out ?3a, v in -v out =3v 0.1 0.2 0.3 0.4 % ams1085-1.5, 0ma ?i out ? 3a, v in -v out =3v 3 7 15 20 mv ams1085-1.8, 0ma ? i out ?3a v in -v out =3v 3 7 15 20 mv ams1085-2.5, 0ma ?i out ? 3a, v in -v out =3v 3 7 15 20 mv ams1085-3.3, 0ma ?i out ? 3a, v in -v out =3v 3 7 15 20 mv ? v out ams1085-5.0, 0ma ?i out ? 3a, v in -v out =3v 5 10 20 35 mv v drop i out =3a, ?v ref , ?v out =1% 1.18 1.3 v i limit v in -v out =3v 4.5 a i load (min) v in =10v (ams1085-adj) 3 10 ma i q v in =10v (ams1085) 5 10 ma psrr f ripple =120hz, c out =25 f i out =3a, v in -v out =3v 60 72 db i adj v in =4.25v, i out =10ma 55 120 a ? i adj 10ma ? i out ?3a, 1.5v ? (v in -v out ) ? 4.5v 0.2 5 a i out =10ma, v in -v out =1.5v 0.5 % t amb =125 c, 1000hrs 0.5 % 10hz ? f ? 10khz 0.003 % to-263-3l 60 to-263-2l 60 to-220-3l 60 ja to-252-2l 100 c/w
pin description 1 gnd/adj --/o ground/adj 2 v out o output voltage 3 v in i input supply voltage pin no. pin name i/o functions function description the ams1085 is a ldo regulator, its pass transistor is made up of a single npn transistor bein g driven by a pnp. the dropout voltage is defined as: v drop = v be + v sat. the ams1085 h as two v ersions: the fixed output version and the adjustabl e output version. output voltages can be 1.5v, 1.8v, 2.5v, 3.3v, and 5.0v.on-chip thermal shut-down circuit provides protection against overload and overheating that wo uld create excessive junction temperature. the adjustable output version requires a 22 f or bigger tantalum capacitor at output for ams1085 stabili ty. the capacitor for fixed output version can be smaller and should be determined base on actual application. generally, the stability of linear regulator stability decreases with output currents increase.
note: the above circuit and parameters are reference onl y, please set the parameters of the real application circuit based on the real test.
6.50 0.25 5.30 0.10 2.30 0.20 0.60 0.10 0.80 0.10 1.50 0.15 3.80 ref 00.127 0.5050.1 1.590.19 5 .550.25 2.30 2.740.20 8.950.30 0.81 2.540.10 5.08 0.10 13.600.20 12.260.20 3.76 0.20 2.670.15 4.57 0.20 1.27 0.10 10.160.20 3.8350.100 1.27 0.42 0.11
4.57 0.10 1.27 1.27 0.10 0 0.15 0.38 + 0.15 - 0.07 8.70 0.20 5.28 0.20 15.25 0.20 2.54typ 10.16 0.15 2.54 0.20 0.81
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