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ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 1 of 12 february 2008 www.diodes.com ? diodes incorporated features general description ap1184 is a 4a regulator with extremely low dropout voltage. this product is specifically des igned to provide well regulated supply for applications requiring 2.8v or lower voltages from 3.3v atx power supplies where high efficiency of the switch can be achieved without the cost and complexity associated with switching regulator. one such application is the new graphic chipsets that requires anywhere from 2.4v to 2.7v supply. ? 0.85v maximum dropout voltage at 4a load current ? built-in thermal shutdown ? output current limiting ? adjustable or fixed output voltage1.5v, 1.8v, 2.5v, 3.3v, 5.0v ? fast transient response ? good noise rejection ? packages: sop-8l, to220-5l and to263-5l ? lead free finish/rohs compliant for lead free products (note 1) ordering information ap1184 xx - x x x package vout s:sop-8l k5:to263-5l t5:to220-5l blank : adj 15 = 1.5v 18 = 1.8v 25 = 2.5v 33 = 3.3v 50 = 5.0v packing -u : tube -13 : taping lead free l : lead free tube/bulk 13? tape and reel device package code packaging (note 2) quantity part number suffix quantity part number suffix ap1184s s sop-8l 100 -u 2500/tape & reel -13 ap1184k5 k5 to263-5l 50 -u 800/tape & reel -13 ap1184t5 t5 to220-5l 50 -u na na lead-free lead-free lead-free notes: 1. rohs revision 13.2.2003. glass and high temperature solder exemptions applied, see eu directive annex notes 5 and 7 . 2. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes.c om/datasheets/ap02001.pdf .
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 2 of 12 february 2008 www.diodes.com ? diodes incorporated pin assignments sop-8l adj(gnd) vsense vin vctrl vin vout nc 7 6 5 8 2 3 4 1 . vout to263-l tab is vout front view 3 2 1 vout vsense adj(gnd) vctrl vin 4 5 to220-5l tab is vout front view vout vsense adj(gnd) vctrl vin 5 2 1 4 3 pin numbers with standard type are for to220-5l, to263-5l packages, and those with boldface type are for sop-8l name i/o description adj (gnd) a resistor divider from this pin to the v out pin and ground sets the output voltage. (gnd only for fixed mode) v sense i this pin is the positive side of the referenc e that allows remote load sensing to achieve excellent load regulation. a minimum of 10uf capacitor must be connected from this pin to ground to insure stability. v in i the input of the 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 higher than v out in order for the device to regulate. v ctrl i this pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor. this pin must always be higher than the v out pin in order to regulate the device. a minimum of 100uf capacitor must be connected from this pin to ground to insure stability. nc no connection v out o the output of the regulator. a minimum of 100uf capacitor must be connected from this pin to ground to insure stability. pin descriptions
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 3 of 12 february 2008 www.diodes.com ? diodes incorporated block diagram thermal shutdown vout adj 1.25v + current limit vin + - + + - vsense vctrl 470uf + 470uf + 5v 470uf + 3.3v 2.5v/4a gnd vsense vin vctrl vin vout vout nc ap1184-2.5v . absolute maximum ratings symbol parameter rating unit v in input voltage 16 v v ctrl control input voltage 18 v p d power dissipation internally limited t st storage temperature range -65 to +150 o c t op operation junction temperature range 0 to +125 o c typical application circuit
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 4 of 12 february 2008 www.diodes.com ? diodes incorporated electrical characteristics (under operating conditions) unless otherwise specified, these specifications apply over, c in = 1uf, c out = 10uf, and t j = 0 to 150 o c. typical value refer to t a = 25 o c. v out = v sense . sym. parameter test condition min. typ. max. unit v ref reference voltage ap1184-adj i o =10ma, t a = 25 o c, (v in -v out ) = 0.7v, v ctrl = v in +1v 1.225 1.250 1.275 v line regulation ap1184-xxx i o = 10ma, v out +0.7v ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 5 of 12 february 2008 www.diodes.com ? diodes incorporated electrical characteristics (continued) unless otherwise specified, thes e specifications apply over, c in = 1uf, c out = 10uf, and t j = 0 to 150 o c. typical value refer to t a = 25 o c. v ou t = v sense . sym. parameter test condition min. typ. max. unit i adj adjust pin current v ctrl = 2.75v, v in = 2.05,v adjj = 0 50 150 a ja thermal resistance junction-to-ambient to263-3l: control circuitry/power transistor (note 4) to220-3l: control circuitry/power transistor (note 4) sop-8l: control circuitry/power transistor (note 5) 23 15 118 o c/w o c/w o c/w jc thermal resistance junction-to-case to263-3l: control circuitry/power transistor (note 4) to220-3l: control circuitry/power transistor (note 4) sop-8l: control circuitry/power transistor (note 5) 3.5 2.5 5.4 o c/w o c/w o c/w notes: 3. ap1184-adj incorporates an internal thermal shutdo wn that protects the device w hen the junction temperature exceeds the allowable maximum junction temperature. 4. test conditions for to263-3l and to220-3l: with copper area of approximately 3in 2 , 1 oz. 5. test conditions for sop-8l: mounted on 2 oz. copper, minimum recommended pad layout , fr-4 pcb. package max pd. remarks to263-3l / to220-3l 2.4w~4.4w with heat sink or amount of copper board needed. sop-8l 1w~2w with heat sink or amount of copper board needed. functional descriptions introduction the ap1184 regulator is a 5 terminal devic e designed specifically to provide extremely low dropout voltages comparable to the pnp type without the disadvantage of the extra power dissipation due to the base current associated with pnp regulators. this i s done by bringing out the control pin of the regulator that provides the base current to the power npn and connecting it to a voltage that is greater than the voltage present at the v in pin. this flexibility makes the ap1184 ideal for applications where dual inputs are available such as a computer motherboard with an atx style power supply t hat provides 5v and 3.3v to the board. one such application is t he new graphic chip sets that require anywhere from 2.4v to 2. 7v supply. the ap1184 can easily be programmed with the addition of two external resistors to any voltages within the range of 1.25v to 15.5v. another major requirement of these graphic chips is the need to switch the load current from zero to several amps in tens of nanoseconds at the processor pi ns, which translates to an approxim ately 300 to 500ns of current step at the regulator. in addition, the out put voltage tolerances are also extremely tight and they include the transient response as part of the specification. the ap1184 is specifically designed to meet the fast current tr ansient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer number of output capacitors. another feature of the device is its true remote sensing capability that allows accurate voltage setting at the load rather than at the device. output voltage setting the ap1184-adj can be programmed to any voltages in the range of 1.25v to 15.5v with the addition of r1 and r2 external resistors according to the following formula:
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 6 of 12 february 2008 www.diodes.com ? diodes incorporated functional descriptions (continued) vout = vref (1+r2/r1) + iadj * r2 where : vref = 1.25v & iadj=50ua typically ap1184-adj vin vctrl adj vout vsense r1+ r2+ vref iadj=50ua the ap1184-adj keeps a constant 1.25v between the v sense pin and the adj pin. by placing a resistor r1 across these two pins and connecting the v sense and v out pin together, a constant current flows through r1, adding to the i adj current and into the r2 resistor producing a voltage equal to the (1.25/r1)*r2 + i adj *r2. this voltage is then added to the 1.25v to set the output voltage. this is summarized in the above equation. since the minimum load current r equirement of the ap1184-adj is 10ma, r1 is typically selecte d to be a 121 ? resistor so that it automatically satisf ies this condition. notice that since the i adj is typically in the range of 50ua it only adds a small error to the output voltage and should be considered when very precise output voltage setting is required. load regulation since the ap1184 has separat e pins for the output (v out ) and the sense (v sense ), it is ideal for providing true remote sensing of the output voltage at the load. this means that the voltage drops due to parasitic resistance such as pcb traces between the regula tor and the load are compensated for using remote sensing. figure followi ng shows a typical application of the ap1184-adj with remote s ensing. ap1184-adj vin vctrl vin vctrl vout vsense adj r1 r2 r l stability the ap1184-xxx requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. typical designs for the microproce ssor applications use standard electrolytic capacitors with typical esr in the range of 50 to 100m and an output capacitance of 100uf to 1000uf. fortunately as the capacitance increases, the esr decreases resulting in a fixed rc time constant. the ap1184-xxx takes advantage of the phenom ena in making the overall regulator loop stable. for most applications a minimum of 100uf aluminum electrolytic capacitor insures bot h stability and good transient response. thermal design the ap1184-xxx incorporates an internal t hermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. although this device can operate with j unction temperatures in the range of 150 o c, it is recommended that the selected heat sink be chosen such that du ring maximum continuous load operation, the junction temperature is kept below this number. the example below shows the steps in selecting the proper surface mount package.
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 7 of 12 february 2008 www.diodes.com ? diodes incorporated functional descriptions (continued) assuming, the following conditions: v out = 2.5v v in = 3.3v v ctrl = 5v i out = 2a dc avg. calculate the maximum power dissipation using the following equation: p d = i out * ( v in - v out ) + ( i out /60) * ( v ctrl - v out ) p d = 2 * (3.3-2.5) + (2/60) * (5-2.5) = 1.68w using table below select the proper package and the amount of copper board needed. package copper area ja ( o c/w) max pd (t a = 25 o c) max pd (t a = 45 o c) sop-8l 1.0? x 1.0? 65 1.7w 1.4w to263-3l pad size-1.4?x1.4? 25-45 2.4w-4.4w 2.0w-3.6w notes: 6. above table is based on the maximum junction temperature of 135 o c. as shown in the above table, any of the two packages will do the job. for low cost applications the sop-8l package is recommen ded.
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 8 of 12 february 2008 www.diodes.com ? diodes incorporated performance characteristics output current (a) v control dropout voltage vs output current vcontrol dropout voltage (mv) 800 900 1000 1100 1200 vpower = 2.05 v tj = 20 o c tj = 120 o c 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 output current (a) v power dropout voltage vs output current 0 vpower dropout voltage (mv) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 vcontrol = 2.75 v tj = 120 o c tj = 20 o c junction temperature ( o c) reference voltage vs junction temperature 1. 247 1. 248 1. 249 1. 250 reference voltage (v) 1. 251 1. 252 1. 253 0 20 40 60 80 100 120 output current (a) load regulation vs output current load regulation (%) 0 0. 02 0. 04 0. 06 0. 08 0. 10 0. 12 0. 14 0. 15 tj = 20 o c tj = 120 o c 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 9 of 12 february 2008 www.diodes.com ? diodes incorporated performance characteristic (continued) v control = 5.0v v power = 3.3v v out = 2.5v c control =10uf c power = 100uf c adj = 0.1uf c out = 470uf i load 10ma to 4a transient response
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 10 of 12 february 2008 www.diodes.com ? diodes incorporated marking information (1) sop-8l 1184 -xx 1184-xx: voltage 1184-15: 1.5v 1184-18: 1.8v 1184-25: 2.5v 1184-33: 3.3v 1184-50: 5.0v internal code xth week: 01~52 (top view) yy ww x x year: "02" = 2002 "01" = 2001 ~ l : lead free logo (2) to263-5l 1184- xx 1184-xx: voltage 1184-15: 1.5v 1184-18: 1.8v 1184-25: 2.5v 1184-33: 3.3v 1184-50: 5.0v logo internal code xth week: 01~52 year: (top view) "02" = 2002 "01" = 2001 yy ww x x ~ l : lead free (3) to220-5l 1184-xx 1184-xx: voltage 1184-15: 1.5v 1184-18: 1.8v 1184-25: 2.5v 1184-33: 3.3v 1184-50: 5.0v logo internal code year: ( top view ) "02" = 2002 "01" = 2001 yy ww x x xth week: 01~52 ~ l : lead free
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 11 of 12 february 2008 www.diodes.com ? diodes incorporated package information (all dimensions in mm) (1) sop-8l 1.27typ 0.3/0.5 7~9 4.80/5.30 3.70/4.10 5.79/6.20 0.20typ 7~9 3.70/4.10 0.38/1.27 0.08/0.25 gauge plane 0.254 seating plane 0.35max. 45 detail "a" detail "a" 1.30/1.50 1.75max. land pattern recommendation 0.78 (unit: mm) 6x-1.27 8x-1.55 8x-0.60 5.4 (2) to263-5l
ap1184 4a ultra low dropout positive adjustable or fixed-mode regulator ap1184 rev. 3 12 of 12 february 2008 www.diodes.com ? diodes incorporated package information (continued) (3) to220-5l important notice life support diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. diodes incorporated does not assume any liability arising out of the application or use of any pr oduct described herein; neither does it convey any license under its patent rights, nor the rights of others. the user of products in such applications shall a ssume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on our website, harmless against all dam ages. diodes incorporated products are not authorized for use as critical components in life support devices or systems without the e xpressed written approval of the president of diodes incorporated.

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