ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 1 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated ? 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 ? lead free packages: to252-3l, to263-3l and to220-3l ? to252-3l, to263-3l and to220-3l: available in ?green? molding compound (no br, sb) ? lead free finish/rohs compliant (note 1) ap1084 is a low dropout positive adjustable or fixed-mode regulator with 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. typical applicat ion circuit 5.0v to 3.3v fixed mode regulator c2 100uf 5v 3.3v/5a tab is v out v in v out gnd c1 100uf adjustable regulator r1 r2 c2 100uf 5v 2.5v/5a tab is v out v in v out adj c1 100uf 121 121 ? ? ) r 1 r 2 (1 v ref v o + ? = note: features general description
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 2 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated lead-free lead-free lead-free lead-free lead-free ap1084 x xx x - x package vout d : to252-3l t : to220-3l k : to263-3l blank = adj 15 = 1.5v 18 = 1.8v 25 = 2.5v 33 = 3.3v 50 = 5.0v packing u : tube 13 : tape & reel lead free l : lead free g : green device package code packaging (note 2) tube/bulk 13? tape and reel quantity part number suffix quantity part number suffix ap1084dxxl-u d to252-3l 80 -u na na ap1084dxxl-13 d to252-3l na na 2500/tape & reel -13 ap1084dxxg-u d to252-3l 80 -u na na ap1084dxxg-13 d to252-3l na na 2500/tape & reel -13 ap1084kxxl-u k to263-3l 50 -u na na ap1084kxxl-13 k to263-3l na na 800/tape & reel -13 ap1084kxxg-u k to263-3l 50 -u na na ap1084kxxg-13 k to263-3l na na 800/tape & reel -13 ap1084txxl-u t to220-3l 50 -u na na ap1084txxg-u t to220-3l 50 -u na na notes: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http://www.diodes.com/products/lead_free.html 2. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. ordering information
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 3 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated pin assignment (1) to252-3l (2) to263-3l 3 2 1 v in v out adj (gnd) ( top view ) tab is v out 3 2 1 v in v out tab is v out ( top view ) adj (gnd) (3) to220-3l tab is v out v out adj (gnd) ( top view) v in 1 2 3 pin name i/o pin # description adj (gnd) i 1 adjustable (ground only for fixed mode) a resistor divider from this pin to the v out pin and ground sets the output voltage (ground only for fixed-mode). v out o 2 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. v in i 3 the input pin of regulator. typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum dropout voltage during the load transient response. this pin must always be 1.4v (1.3v) higher than v out in order for the device to regulate properly. pin description
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 4 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated block diagram 3 thermal shutdown 1 2 v out adj 1.25v + + current limit v in + - + - absolute maxi mum ratings symbol parameter rating unit v in dc supply voltage -0.3 to 12 v t st storage temperature -65 to +150 o c t mj maximum junction temperature 150 o c recommended oper ating conditions symbol parameter min max unit t op operating junction temperature range 0 125 o c
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 5 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated electrical characteristics (under operating conditions) symbol parameter conditions min typ. max unit v ref reference voltage io = 10ma, t a = 25 o c, (v in -v out ) = 1.5v 1.225 1.250 1.275 v line regulation ap1084-xxx i o = 10ma, v out +1.5v ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 6 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated 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 v in and v out to maintain output regulation. in addition, the output voltage tolerances are also extremely tight and they include the transie nt 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 volt age, 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 res istors according to the following formula: v out = v ref (1+ r2/r1) +i adj *r2 , where v ref = 1.25 typically, i adj = 55ua typically r1 & r2 as shown below: ap1084 v in v out v ref adj r1 r2 i adj = 55ua the ap1084 keeps a constant 1.25v between the output pin and the adjust pin. by placing a resistor r1 across these two pin s 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. sinc e 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 that since iadj is typically in the range of 55ua it only adds a small error to the out put voltage and should only be considered when a very precise output voltage setting is required. for example, in a typical 3.3v applicatio n 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 t he 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 connect ed directly to the case or the v out 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 p ossible 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 st able. for most 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 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 i s kept below that temperature. layout consideration the output capacitors must be located as close to the v out 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 v out pin to the output capacitors to prevent any high frequency oscillation that may result due to excessive trace inductance.
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 7 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated typical perform ance characteristics temperature ( o c) percent change in output voltage vs temperature o u t pu t v o l t age c hange (%) -40 -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 681012 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 d ropou t v o l t age ( 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 (%) -40 0 25 50 75 100 125 - 1 -0.80 -0.40 -0.20 0 0.20 i load=1.5a
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 8 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated marking information (1) to252-3l 84-vv ( top view ) yy ww x x 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 5.0v l : lead free g : green x : internal code ww : week : 01~52, 52 represents yy : year : 01~09 52 and 53 week (2) to263-3l 1084-vv ( top view ) yy ww x x logo g : green part number vv: 15 for 1.5v 18 for 1.8v 25 for 2.5v 33 for 3.3v 50 for 5.0v blank for adj x : internal code yy : year : 01~09 ww : week : 01~52 , 52 represents 52 and 53 week l : lead free (3) to220-3l
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 9 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated package information (all dimensions in mm) (1) package type: to252-3l 5.20/5.50 typ 5.35 6.354/6.80 typ 6.58 2.28 bsc. 0.61 typ 0.88/1.27 4.57 bsc. 9.00/10.40 typ 9.70 seating plane see note2 0.51 5.6 11.0 5.6 2.0 2.25 land pattern recommendation (unit: mm) 7.2 1.2 2.18/2.40 typ 2.29 0.45/0.58 typ 0.52 0.64/1.02 typ 0.83 0.45/0.58 typ 0.52 0.89/ 1.14 5.40/6.20 typ 5.57 (2) package type: to263-3l 9.65/10.29 typ 9.97 2.54 bsc. 2.92 typ 1.30 0.51/0.99 typ 0.75 1.14/1.40 typ1.27 8.65/9.65 typ 9.15 1.27/ 1.78 typ 1.52 14.61/15.88 typ 15.24 4.06/4.83 typ 4.45 1.14/1.40 typ 1.27 2.28/2.80 typ 2.54 1.3 3 15.7 10.9 9.1 land pattern recommendation (unit: mm) 2.54 0.38 typ
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 10 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated package information (continued) (3) package type: to220-3l 3.55/4.85 typ 4.20 0.51/1.40 typ 0.95 0.31/1.14 typ 0.72 seating plane 14.20/16.50 typ 15.35 9.70/10.70 typ 10.20 12.72/14.72 typ 13.72 0.51/1.14 typ 0.83 4.83/5.33 typ 5.08 1.14/1.78 typ 1.46 3.53/4.09 typ 3.81 5.84/6.86 typ 6.35 2.54/3.43 typ 2.98 3.66/6.35 typ 5.00 2.03/2.92 typ 2.48 2.99/2.79 typ 2.54 ?
ap1084 5a low dropout positive adjustable or fixed-mode regulator ap1084 rev. 8 11 of 11 june 2009 ds31070 www.diodes.com ? diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to ma ke modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its repr esentatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2009, diodes incorporated www.diodes.com
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