5a ldo voltage regulator description the ams1084 is a positive low voltage dropout regulator, voltage dropout is only 1.5v at 5a. ams1084 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 ams1084 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 while the voltage is 1.5v, 1.8v, 2.5v, 3.3v, 5.0v and the adjustable output v out * low dropout voltage: 1.5v at 5a output current * current limiting: 6.5a *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)
ams1084d-adj ams 1084cd ams1084d-adjtr ams1084cd ams1084d-1.5 ams1084cd- 1.5 ams1084d-1.5tr ams1084cd- 1.5 ams1084d-1.8 ams1084cd- 1.8 ams1084d-1.8tr ams1084cd- 1.8 ams1084d-2.5 ams1084cd- 2.5 ams1084d-2.5tr ams1084cd- 2.5 ams1084d-3.3 ams1084cd- 3.3 ams1084d-3.3tr ams1084cd- 3.3 ams1084d-5.0 ams1084cd- 5.0 ams1084d- 5.0tr t o-252-2l ams1084cd-5 .0 ams1084s-adj ams1084cm ams1084s-adjtr ams1084cm-adj ams1084s-1.5 ams1084cm-1. 5 ams1084s-1.5tr ams1084cm-1. 5 ams1084s-1.8 ams1084cm-1. 8 ams1084s-1.8tr ams1084cm-1. 8 ams1084s-2.5 ams1084cm-2. 5 ams1084s-2.5tr ams1084cm-2. 5 ams1084s-3.3 ams1084cm-3. 3 ams1084s-3.3tr ams1084cm-3. 3 ams1084s-5.0 ams1084cm-5. 0 ams1084s-5. 0tr t o-263-3l ams1084cm-5.0 ams1084t-adj ams1084ct ams1084t-1.5 ams1084ct-1.5 ams1084t-1.8 ams1084ct-1.8 ams1084t-2.5 ams1084ct-2.5 ams1084t-3.3 ams1084ct-3.3 ams1084t-5.0 t o-220-3l ams1084ct-5.0 ams1084s2-adj ams1084cm ams1084s2-adjtr ams1084cm ams1084s2-1.5 ams1084cm-1.5 ams1084s2-1.5tr ams1084cm-1.5 ams1084s2-1.8 ams1084cm-1.8 ams1084s2-1.8tr ams1084cm-1.8 ams1084s2-2.5 t o-263-2l ams1084cm-2.5
ams1084s2-2.5tr ams1084cm-2.5 ams1084s2-3.3 ams1084cm-3.3 ams1084s2-3.3tr ams1084cm-3.3 ams1084s2-5.0 ams1084cm-5.0 ams1084s2-5.0tr t o-263-2l ams1084cm-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 ams1084-adj, i out =10ma, v in -v out =3v, 10ma i out 5a,1.5v v in -v out 5v 1.238 1.225 1.250 1.250 1.262 1.270 v ams1084-1.5, i out =10ma, v in =4.5v, 10ma i out 5a, 3.0v v in 6v 1.485 1.47 1.5 1.5 1.515 1.53 v ams1084-1.8, i out =10ma, v in =4.8v, 10ma i out 5a, 3.3v v in 6v 1.782 1.764 1.8 1.8 1.818 1.836 v ams1084-2.5, i out =10ma, v in =5.5v 10ma i out 5a, 4.0v v in 7v 2.475 2.45 2.5 2.5 2.525 2.55 v ams1084-3.3, i out =10ma, v in =6.3v, 10ma i out 5a, 4.8v v in 8v 3.267 3.234 3.3 3.3 3.333 3.366 v v out ams1084-5.0, i out =10ma, v in =8v, 10ma i out 5a, 6.5v v in 10v 4.95 4.9 5 5 5.05 5.1 v ams1084-adj, i out =10ma, 2.85v v in 10v 0.015 0.035 0.2 0.2 % ams1084-1.5, i out =10ma, 3.0v v in 10v 0.5 1 6 6 mv ams1084-1.8, i out =10ma, 3.3v v in 10v 0.5 1 6 6 mv ams1084-2.5, i out =10ma, 4.0v v in 10v 0.5 1 6 6 mv ams1084-3.3, i out =10ma, 4.8v v in 10v 0.5 1 6 6 mv v out ams1084-5.0, 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. )
ams1084-adj, 0mai out 5a, v in -v out =3v 0.1 0.2 0.3 0.4 % ams1084-1.5, 0mai out 5a, v in -v out =3v 3 7 15 20 mv ams1084-1.8, 0ma i out 5a v in -v out =3v 3 7 15 20 mv ams1084-2.5, 0mai out 5a, v in -v out =3v 3 7 15 20 mv ams1084-3.3, 0mai out 5a, v in -v out =3v 3 7 15 20 mv v out ams1084-5.0, 0mai out 5a, v in -v out =3v 5 10 20 35 mv v drop i out =5a, v ref , v out =1% 1.45 1.5 v i limit v in -v out =3v 5.5 6.5 a i load (min) v in =10v (ams1084-adj) 3 10 ma i q v in =10v (ams1084) 5 10 ma psrr f ripple =120hz, c out =25 f i out =5a, 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 5a, 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 ams1084 is a ldo regulator, its pass transistor is made up of a sing le npn transistor bein g driven by a pnp. the dropout voltage is defined as: v drop = v be + v sat. the ams084 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 ams1084 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 0.20 9.70 0.30 2.30 typ 4.60 0.10 2.30 0.10 0.6 0.9 0.60 0.10 0.80 0.10 1.50 0.15 3.80 ref 2.5 3.0 0.0 0.127 0.5 0.1 1.6 0.2 5.6 0.3 0.5 0.1 6.600.3 5.33 ref 10.100.30 2.30 typ 2.300.10 0.0 0.10 6.1 0.2 0.9 1.25 0.45 0.65 0.80 0.20 0.80 0.10 1.80 ref 1.4 1.7 0.450.65 5.30ref
8.950.30 0.81 2.540.10 5.08 0.10 13.600.20 12.260.20 2.740.20 3.76 0.20 2.670.15 4.57 0.20 1.27 0.10 0.42 0.11 3.835 0.100 1.27 10.16 0.20
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 disclaimer: ? ams reserves the rig ht t o make ch an g es t o the inf ormation herei n f or the improvement of the design and performance without further notice! customers should obtain the latest relevant information before placing orders and should verify that such information is complete and current. ? all semiconductor prod uc t s malf u nction or f ail wi th som e probability under special conditio ns . when using ams prod uc t s in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essenti al measures to avoid situation s in which a malf unction or failure of such ams products could cause loss of body injury or damage to property. ? ams will supply the be s t po ss i ble product for cu s tomers!
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