ape1084 5a low dropout positive adjustable or fixed-mode regulator this datasheet contains new product information. advanced power electronics corp. reserves the rights to modify the product spe cification without notice. no liability is assumed as a result of the use of this product. no rights under any patent accompany the sale of the product. halogen free product 201003126 1. features ? 1.4v maximum dropout at full load current ? built-in thermal shutdown ? output current limiting ? adjustable output voltage or fixed 1.5v, 1.8v, 2.5v, 3.3v, 5.0v ? fast transient response ? good noise rejection ? package : to252, to263, to220 ? rohs co mp liant & halogen free product ordering information general description ape1084 is a low dropout positive adjustable or fixed-mode regulator with minimum of 5.0a output current capability. the product is specifically designed to provide well-regulated supply for low voltage ic applications such as high-speed bus termination and low current 3.3v logic supply. ape1084 is also well suited for other applications such as vga cards. ape1084 is guaranteed to have lower than 1.4v dropout at full load current making it ideal to provide well-regulated outputs of 1.25 to 3.3v with 4.7 to 12v input supply. ape 1084 x xx - hf low dropout regulator package vout h : to252-3l s : to263-3l p : to220-3l blank : adj 15 = 1.5v 18 = 1.8v 25 = 2.5v 33 = 3.3v 50 = 5.0v block diagram 3 thermal shutdown 1 2 vout adj 1.25v + + current limit vin + + 1 x halogen free
ape1084 5a low dropout positive adjustable or fixed-mode regulator advanced power electronics corp. www.a-power.com.tw pb free plating product connection diagram to263 3 2 1 vin vout adj (gnd) tab is vout front view to252 3 2 1 vin vout adj (gnd) tab is vout front view to220 tab is vout 3 vin 2 1 vout adj (gnd) front view pin descriptions pin no. name i/o to263/ 252/220 pdip-8 function adj (gnd) i 1 1 adjustable (ground only for fixed mode) a resistor divider from this pin to the vout pin and ground sets the output voltage. (ground only for fixed-mode) vout o 2 2/3/5/6/ 7/8 the output of the regulator. a minimum of 10uf (0.15 [ ? [) capacitor must be connected from this pin to ground to insure stability. vin i 3 4 the input pin of regulator. typically a large storage capacitor (0.15[ ??[) is connected from this pin to ground to insure that th e input voltage does not sag below the minimum dropout voltag e during the load transient response. this pin must always be 1.4 v (1.3v) higher than vout in order for the device to regulate properly. 2
ape1084 5a low dropout positive adjustable or fixed-mode regulator advanced power electronics corp. www.a-power.com.t w pb free plating product absolute maximum ratings symbol parameter rating unit vin dc supply voltage -0.3 to 12 v p d power dissipation internally limited t st storage temperature -65 to +150 o c t op operating junction temperature range 0 to +150 o c electrical characteristics (under operating conditions) sym. parameter conditions (notes) min. typ. max. unit v ref reference voltage io=10ma, tj=25 o c, (vin-vout)=1.5v 1.225 1.250 1.275 v ape1084-xxx i o =10ma, v out +1.5v ape1084 5a low dropout positive adjustable or fixed-mode regulator advanced power electronics corp. www.a-power.com.t w pb free plating product typical circuit (1) to263/252/220 5.0v to 3.3v fixed mode regulator c2 100uf 5v 3.3v/5a tab is vout vin vout gnd c1 100uf adjustable regulator r1 r2 c2 100uf 5v 2.5v/5a tab is vout vin vout adj c1 100uf 121 121 ! ! ) r 1 r 2 (1 v ref v o note: 4
ape1084 5a low dropout positive adjustable or fixed-mode regulator advanced power electronics corp. www.a-power.com.t w pb free plating product functional description introduction the ape1084 adjustable low dropout (ldo) regulator is a 3 terminal device that can easily be programmed with the addition of two external resistors to any voltages within the range of 1.25v to vin-1.4v. the ape1084 only needs 1.4v differential between vin and vout to maintain output regulation. in addition, the output voltage tolerances are also extremely tight and they include the transient response as part of the specification. for example, intel vre specification calls for a total of +/- 100mv including initial tolerance, load regulation and 0 to 5.0a load step. the ape1084 is specifically designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer output capacitors. output voltage setting the ape1084 can be programmed to any voltages in the range of 1.25v to vin-1.4v with the addition of r1 and r2 external resistors according to the following formula: vout = vref (1+ r2/r1) +iadj *r2 , where vref = 1.25 typically, iadj = 55ua typically r1&r2 as shown at below ape1084 vin vout vref adj r1 r2 iadj=55ua the ape1084 keeps a constant 1.25v between the output pin and the adjust pin. by placing a resistor r1 across these two pins a constant current flows through r1, adding to the iadj current and into the r2 resistor producing a voltage equal to the (1.25/r1)*r2+iadj*r2 which will be added to the 1.25v to set the output voltage. this is summarized in the above equation. since the minimum load current requirement of the ape1084 is 10ma, r1 is typically selected to be 121 ! resistor so that it automatically satisfies the minimum current requirement. notice that since iadj is typically in the range of 55ua it only adds a small error to the output voltage and should only be considered when a very precise output voltage setting is required. for example, in a typical 3.3v application where r1=121 ! and r2=200 ! the error due to iadj is only 0.3% of the nominal set point. load regulation since the ape1084 is only a 3 terminal device, it is not possible to provide true remote sensing of the output voltage at the load. the best load regulation is achieved when the bottom side of r2 is connected to the load and the top-side of r1 resistor is connected directly to the case or the vout pin of the regulator and not to the load. it is important to note that for high current applications, this can re-present a significant percentage of the overall load regulation and one must keep the path from the regulator to the load as short as possible to minimize this effect. stability the ape1084 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. for most applications a minimum of 10uf aluminum electrolytic capacitor insures both stability and good transient response. thermal design the ape1084 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the maximum allowable junction temperature. although this device can operate with junction temperatures in the range of 150 o c , it is recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction temperature is kept below the temperature. layout consideration the output capacitors must be located as close to the vout terminal of the device as possible. it is recommended to use a section of a layer of the pc board as a plane to connect the vout pin to the output capacitors to prevent any high frequency oscillation that may result due to excessive trace inductance. 5
ape1084 5a low dropout positive adjustable or fixed-mode regulator advanced power electronics corp. www.a-power.com.tw pb free plating product performance characteristics temperature ( o c) percent change in output voltage vs temperature output voltage change (%) -50 -25 0 25 50 75 100 125 150 - 2 -1.5 - 1 -0.5 0 0. 5 1 1.5 2 input voltage (v) line regulation output voltage deviation (%) 0 0.2 0.4 0.6 0.8 1 24 6 8 10 12 time (us) line transient response output voltage deviation (mv) input voltage (v) -40 -20 0 20 40 5.5 6.5 7.5 cin=1uf cout=10uf tantalum 0 20 40 60 80 100 120 140 160 180 200 time (us) load transient response load current (a) output voltage deviation (mv) 010 20 30 40 50 60 70 80 90 100 0 2 4 6 -40 -20 0 20 40 60 cin=1uf cout=10uf tantalum preload=100ma output current (a) dropout voltage vs output current dropout voltage (v) 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 1. 4 1. 6 1. 8 2. 0 0 1 234 tj = 125 o c tj = 25 o c 5 temperature ( o c) load regulation vs temperature output voltage deviation (%) -25 0 25 50 75 100 125 - 1 -0.80 -0.40 -0.20 0 0.20 i load=1.5a 6
package outline : to-252 millimeters min nom max a2 1.80 2.30 2.80 a3 0.40 0.50 0.60 b1 0.40 0.70 1.00 d 6.00 6.50 7.00 d1 4.80 5.35 5.90 e3 3.50 4.00 4.50 e3 f 2.20 2.63 3.05 f1 0.5 0.85 1.20 e1 5.10 5.70 6.30 e2 0.50 1.10 1.80 e -- 2.30 -- c 0.35 0.50 0.65 1.all dimensions are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : to-252 symbols advanced power electronics corp. e e d d1 e2 e1 f b1 f1 a2 a3 c r : 0.127~0.381 ( 0.1mm part number 1084-&& ywwsss date code (ywwsss) ylast digit of the year wwweek ssssequence logo 7 15 : 1.5v 33 : 3.3v 18 : 1.8v 50 : 5.0v 25 : 2.5v vout ---blank : adj
package outline : to-220 millimeters min nom max a 4.40 4.60 4.80 b 0.76 0.88 1.00 d 8.60 8.80 9.00 c 0.36 0.43 0.50 e 9.80 10.10 10.40 l4 14.70 15.00 15.30 l5 6.20 6.40 6.60 d1 c1 1.25 1.35 1.45 b1 1.17 1.32 1.47 l 13.25 13.75 14.25 e l1 2.60 2.75 2.89 e1
package outline : to-263 millimeters min nom max a 4.25 4.75 5.20 a1 0.00 0.15 0.30 a2 2.20 2.45 2.70 b 0.70 0.90 1.10 b1 1.07 1.27 1.47 c 0.30 0.45 0.60 c1 1.15 1.30 1.45 d 8.30 8.90 9.40 d1 d2 e 9.70 10.10 10.50 e1 e2 e3 e 2.04 2.54 3.04 l1 l2 l3 4.50 4.90 5.30 l4
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