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ap1084 5a low dropout positive adjus table or fixed-mode regulator this datasheet contains new product information. anachip corp. reserves the rights to modify the product specification 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. rev.1.2 jun.9, 2005 1/11 ? 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, pdip-8 ? ordering information ? general description ap1084 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. ap1084 is also well suited for other applications such as vga cards. ap1084 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. ap1084 x x x x low dropout regulator package vout d : to252-3l k : to263-3l t : to220-3l n : pdip-8l blank : adj 15 = 1.5v 18 = 1.8v 25 = 2.5v 33 = 3.3v 50 = 5.0v packing blank : tube a : taping lead free blank : normal l : lead free package ? block diagram 3 thermal shutdown 1 2 vout adj 1.25v + + current limit vin + + this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 2/11 ? 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 ap1084 7 5 4 3 2 1 6 vout adj(gnd) vin top view vout 8 vout vout vout vout pdip-8 ? 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 ? esr 20 ? ) 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 ? esr 20 ? ) is connected from this pin to ground to insure that th e input voltage does not sag be low 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. this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 3/11 ? 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 ap1084-xxx i o =10ma, v out +1.5v> 5.5mm*5.5mm (like 10mm*10mm). this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 4/11 ? 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: (2) pdip-8 c2 100uf 5v 3.3v/1a tab is vout vin vout gnd c1 100uf 5v/3.3v fixed output ! r1 121 r2 121 c2 100uf 5v 2.5v/1a tab is vout c1 100uf o v 5v/2.5v adj output ! vout vout vout vout vout vin vout adj vout vout vout vout vout ? ? ) r 1 r 2 (1 v ref v o + ? = note: this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 5/11 ? functional description introduction the ap1084 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 ap1084 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 ap1084 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 ap1084 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 ap1084 vin vout vref adj r1 r2 iadj=55ua the ap1084 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 ap1084 is 10ma, r1 is typically selected to be 121 ? resistor so that it automatically satisfies the minimum current requirement. notice t hat 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 ap1084 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 ap1084 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. for mo st applications a minimum of 10uf aluminum electrolytic capacitor insures both stability and good transient response. thermal design the ap1084 incorporates an internal thermal shutdown that protects t he 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 k ept 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. this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 6/11 ? performance ch aracteristics 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 deviati on (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 1234 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 this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 7/11 ? marking information logo part number 1084 for adj 84-vv : 15 for 1.5v 18 for 1.8v 25 for 2.5v 33 for 3.3v 50 for 5v yy : year ww: nth week x : internal code ( optional) ( top view) 84-vv yywwx x blank: normal l: lead free package (to252-3l) logo part number vv : 15 for 1.5v 18 for 1.8v 25 for 2.5v 33 for 3.3v 50 for 5v blank for adj yy : year ww: nth week x : internal code ( optional) ( top view) 1084-vv yywwx x blank: normal l: lead free package (to220-3l / to263-3l) ( top view ) logo id code: internal year: "01" =2001 "02" =2002 xth week: 01~52 ~ 1 8 5 1084-vv yy ww x x 4 part number vv : 15 for 1.5v 18 for 1.8v 25 for 2.5v 33 for 3.3v 50 for 5v blank for adj blank: normal l: lead free package (pdip-8l) this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 8/11 ? package dimension (1) to263-3l e e l2 b b2 d l3 l a c2 c l1 1.3 3 15.7 10.9 9.1 land pattern recommendation (unit: mm) 2.54 dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 4.06 4.45 4.83 0.160 0.175 0.190 b 0.51 0.75 0.99 0.020 0.030 0.039 b2 1.14 1.27 1.40 0.045 0.050 0.055 c 0.38 typ. 0.015 typ. c2 1.14 1.27 1.40 0.045 0.050 0.055 d 8.65 9.15 9.65 0.341 0.360 0.380 e 9.65 9.97 10.29 0.380 0.393 0.405 e 2.54 bsc. 0.100 bsc. l 14.61 15.24 15.88 0.575 0.600 0.625 l1 2.28 2.54 2.80 0.090 0.100 0.110 l2 - 1.30 2.92 - 0.051 0.115 l3 1.27 1.52 1.78 0.050 0.060 0.070 this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 9/11 (2) to252-3l b2 e e b l2 e1 d l1 h a c1 c a1 seating plane see note2 l 5.6 11.0 5.6 2.0 2.25 land pattern recommendation (unit: mm) 7.2 1.2 notes: 1. jedec outline: to-252 ab 2. mils suggested for positive contact at mounting. dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 2.18 2.29 2.40 0.086 0.090 0.094 a1 0.89 - 1.14 0.035 - 0.045 b 0.61 typ. 0.024 typ. b2 5.20 5.35 5.50 0.205 0.211 0.217 c 0.45 0.52 0.58 0.018 0.020 0.023 c1 0.45 0.52 0.58 0.018 0.020 0.023 d 5.40 5.57 6.20 0.213 0.219 0.244 e 6.35 6.58 6.80 0.250 0.259 0.268 e 2.28 bsc. 0.090 bsc. e1 4.57 bsc. 0.180 bsc. h 9.00 9.70 10.40 0.354 0.382 0.409 l 0.51 - - 0.020 - - l1 0.64 0.83 1.02 0.025 0.033 0.040 l2 0.88 - 1.27 0.035 - 0.050 this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 10/11 (3) to220-3l a j1 f c seating plane d q e l1 l b e e1 b1 p h1 dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a 3.55 4.20 4.85 0.140 0.165 0.191 b1 1.14 1.46 1.78 0.045 0.057 0.070 b 0.51 0.83 1.14 0.020 0.033 0.045 c 0.31 0.72 1.14 0.012 0.028 0.045 d 14.20 15.35 16.50 0.559 0.604 0.650 e 9.70 10.20 10.70 0.382 0.402 0.421 e 2.29 2.54 2.79 0.090 0.100 0.110 e1 4.83 5.08 5.33 0.190 0.200 0.210 f 0.51 0.95 1.40 0.020 0.037 0.055 h1 5.84 6.35 6.86 0.230 0.250 0.270 j1 2.03 2.48 2.92 0.080 0.098 0.115 l 12.72 13.72 14.72 0.501 0.540 0.580 l1 3.66 5.00 6.35 0.144 0.197 0.250 ?p 3.53 3.81 4.09 0.139 0.150 0.161 q 2.54 2.98 3.43 0.100 0.117 0.135 this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084
ap1084 5a low dropout positive adjus table or fixed-mode regulator anachip corp. www.anachip.com.tw rev.1.2 jun.9, 2005 11/11 (4) pdip-8l e1 d 7 (4x) a l a2 a1 b2 b1 b e s 15 (4x) e c eb e-pin o0.118 inch pin #1 indent o0.025 deep 0.006-0.008 inch dimensions in millimeters dimensions in inches symbol min. nom. max. min. nom. max. a - - 5.33 - - 0.210 a1 0.38 - - 0.015 - - a2 3.1 3.30 3.5 0.122 0.130 0.138 b 0.36 0.46 0.56 0.014 0.018 0.022 b1 1.4 1.52 1.65 0.055 0.060 0.065 b2 0.81 0.99 1.14 0.032 0.039 0.045 c 0.20 0.25 0.36 0.008 0.010 0.014 d 9.02 9.27 9.53 0.355 0.365 0.375 e 7.62 7.94 8.26 0.300 0.313 0.325 e1 6.15 6.35 6.55 0.242 0.250 0.258 e - 2.54 - - 0.100 - l 2.92 3.3 3.81 0.115 0.130 0.150 eb 8.38 8.89 9.70 0.330 0.350 0.382 s 0.71 0.84 0.97 0.028 0.033 0.038 this anachip version datasheet is replaced with diodes inc. datasheet ap1084 this anachip version datasheet is replaced with diodes inc. datasheet ap1084

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