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ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 1 of 11 www.diodes.com september 2010 ? diodes incorporated new product description the ap7168 is a 1.2a, adjustabl e output voltage, ultra-low dropout linear regulator. the device includes pass element, error amplifier, band-gap refer ence, current limit and thermal shutdown circuitry. the device is turned on when en pin is set to logic high level. a power-ok (pok) output is available for power sequence control. the characteristics of the low dropout voltage and low quiescent current make it suitable for low to medium power applications, for example, lapt op computers, audio and video applications, and battery powered devices. the typical quiescent current is approximately 125a. built-in current-limit and therma l-shutdown functions prevent ic from damage in fault conditions. the ap7168 is available in so-8ep package. features ? wide input voltage range: 2.2v ? 5.5v ? 230mv very low dropout at 500ma load ? 500mv very low dropout at 1a load ? very low quiescent current (i q ): 125a typical ? adjustable output voltage range: 0.8v to 5.0v ? very fast transient response ? high psrr ? accurate voltage regulation ? current limiting and short circuit protection ? thermal shutdown protection ? stable with any type output capacitor 4.7f ? ambient temperature range -40oc to 85c ? so-8ep: available in ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) pin assignments nc nc en in fb gnd out ( top view ) 1 2 3 4 8 7 6 5 pok so-8ep applications ? servers and laptops ? smart phone and pda ? mp3/mp4 ? bluetooth headset ? low and medium power applications ? fpga and dsp core or i/o power notes: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. pl ease visit our website at http://www.diodes.com/products/lead_free.html . typical application circuit 1 f in gnd en out enable fb 10f v in v out pok 100kohm r 1 r 2 ap7168 ? ? ? ? ? ? ? ? += 2 1 ref out r r 1vv
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 2 of 11 www.diodes.com september 2010 ? diodes incorporated new product pin descriptions name pin number description in 1 voltage input pins, to be tied together external ly. bypass to ground through at least 1f capacitor. pok 2 power-ok output, active-high open-drain. en 4 enable input, active high. gnd 5 ground. fb 7 output feedback. out 8 voltage output pins, to be tied together extern ally. bypass to ground through at least 4.7f ceramic capacitor. nc 3, 6 no connection. functional block diagram in en gnd fb out gate driver 0.8v 0.744v pok current limit and thermal shutdown absolute maximum ratings symbol parameter ratings unit esd hbm human body model esd protection 4 kv esd mm machine model esd protection 300 v v in input voltage 7 v out, fb, pok, en voltage v in + 0.3 v continuous load current internal limited t j operating junction temperat ure range -40 ~ 150 c t st storage temperature range -65 ~150 c p d power dissipation so-8ep (note 2, 4) 4.0 w notes: 2. ratings apply to ambient temperature at 25c recommended operating conditions symbol parameter min max unit v in input voltage 2.2 5.5 v i out output current 0 1.2 a t a operating ambient temperature -40 85 c
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 3 of 11 www.diodes.com september 2010 ? diodes incorporated new product electrical characteristics (t a = 25 o c, v in = v out +1v, c in = 1 f, c out = 1 f, v en = 2v, unless otherwise stated) symbol parameter test conditions min typ. max unit i q input quiescent current i out = 0 ? 125 180 a i shdn input shutdown current v en = 0v, i out = 0 (note 3) -1 0.1 1 a v dropout dropout voltage v out 1.5v, i out = 0.5a 230 mv v out 1.5v, i out = 1a 500 800 mv v ref fb reference voltage 0.8 v i fb fb leakage ? 0.01 1 a v out output voltage total accuracy -3 3 % out in out v v v / line regulation v in = v out +1v to 5.5v, i out = 1ma 0.02 %/v v out / v out load regulation i out from 1ma to 1a -1.5 1.5 % t st start-up time, from en high to pok high v en = 0v to 2.0v, i out = 100ma, v in = 3.3v 190 s psrr power supply rejection ratio 1khz, v in = 3.3v, v out = 1.2v, i out = 100ma 60 db i limit current limit v out = 1.8v, r out = 0.5 1.2 1.6 a i short short-circuit current v in = 3.3v, v out < 0.2v 750 ma v il en input logic low voltage 0.4 v v ih en input logic high voltage 1.4 v i en en input leakage v en = 0v or 5.5v ? 0.01 1 a v ol pok output low voltage force 2ma 100 200 mv v pok_th_up output voltage (rising) pok threshold fb (or out for fixed version) rising 87% 92% 97% v ref v pok _ h y s output voltage pok hysteresis 4% v ref pok deglitch v in = 3.3v, v out = 1.2v 160 s i pok _ lk pok leakage current v pok = 5.5v ? 0.01 1 a t shdn thermal shutdown threshold 145 c t hys thermal shutdown hysteresis 25 c ja thermal resistance junction-to- ambient sop-8l-ep (note 4) 27 o c/w notes: 3. pok pin must be disconnected from in pin. 4 . test condition for so-8ep: device mounted on 2" x 2" fr-4 substrate pcb, 2oz copper, with minimum recommended pad on top layer and thermal vias to bottom layer ground plane.
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 4 of 11 www.diodes.com september 2010 ? diodes incorporated new product typical performance characteristics output voltage vs. temperature 3.20 3.25 3.30 3.35 3.40 -50 -25 0 25 50 75 100 125 temperature ( 0 c) output voltage (v) vout = 3.3v output voltage vs. tem perature 1. 10 1. 15 1. 20 1. 25 1. 30 -50-25 0 2550 75100125 temperature ( 0 c) output voltage (v) vout = 1.2v quiescent current vs. input voltage 80 95 110 125 140 155 170 4.0 4.3 4.6 4.9 5.2 5.5 input voltage (v) quiescent current ( a) iout=0ma iout=500ma quiescent current vs. i out 100 110 120 130 140 150 160 170 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 1. 2 i out (a) quiescent current ( a) vin=2.5v vin=3.3v quiescent current vs. temperature 80 95 110 125 140 155 170 -50. 0 -25. 0 0. 0 25. 0 50. 0 75. 0 100. 0 125. 0 temperature ( 0 c) quiescent current ( a) vin=2.2v, vout=1.0v vin=3.3v, vout=1.8v vin=5.0v, vout=3.3v reference voltage vs. temperature 0.790 0.795 0.800 0.805 0.810 -50-25 0 255075100125 temperature ( 0 c) reference voltage (v) vin=2.2v vin=3.3v vin=5.5v v out =1.8v v out =3.3v
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 5 of 11 www.diodes.com september 2010 ? diodes incorporated new product typical performance characteristics (continued) line regulation -0.10 -0.05 0. 00 0. 05 0. 10 3. 0 3. 5 4. 0 4. 5 5. 0 5. 5 v in (v) change in v out (%/v) 25c 85c -40c load regulation -0.5 -0.4 -0.3 -0.2 -0.1 0. 0 0. 1 0. 2 0. 3 0. 4 0. 5 0. 0 0. 4 0. 8 1. 2 i out (a) change in v out (%) 25c 85c -40c short circuit current vs. input voltage 0. 69 0. 70 0. 71 0. 72 0. 73 0. 74 0. 75 0. 76 0. 77 2.2 2.4 2.6 2.8 3 3.2 3.4 input voltage (v) short circuit current (a) short circuit current vs. temperature 0.60 0.65 0.70 0.75 0.80 -50 -25 0 25 50 75 temperature ( o c) short circuit current (a) dropout voltage vs. i out 0 100 200 300 400 500 600 700 0 0.2 0.4 0.6 0.8 1 1.2 i out (a) dropout voltage (mv) 25c 85c -40c psrr -80 -75 -70 -65 -60 -55 -50 -45 -40 100 1000 10000 100000 frequency (hz) ps rr (d b) v out =1.8v, i out =1ma v in =2.2v, v out =1.2v, v out =1.2v v out =1.2v v out =3.3v
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 6 of 11 www.diodes.com september 2010 ? diodes incorporated new product typical performance characteristics (continued) line transient response time (5ms/div) line transient response time (500us/div) output load transient response (v out =1.8v) time (100us/div) output load transient response (v out =3.3v) time (100us/div) start-up time (v out =1.2v, i out =0.1a) time (50us/div) start-up time (v out =1.2v, i out =1.2a) time (50us/div) v in 2v/div v out 50mv/div v in =3v to 5.5v c out =10uf (ceramic) c out =470uf (electrolytic) 100mv/div 500ma/div 50ma 1.2a 1a/us c out =10uf (ceramic) c out =1uf (ceramic) v out i ou v in 2v/div v out 50mv/div v in =5.5v to 3v c out =10uf (ceramic) c out =470uf (electrolytic) 100mv/div 500ma/div 50ma 1.2a 1a/us c out =10uf (ceramic) c out =1uf (ceramic) v out i ou v en 2v/div v out 1v/div v pok 2v/div c out =10uf v en 2v/div v out 1v/div v pok 2v/div c out =10uf
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 7 of 11 www.diodes.com september 2010 ? diodes incorporated new product typical performance characteristics (continued) current limit vs. temperature 1.4 1.5 1.6 1.7 1.8 -50 -25 0 25 50 75 100 temperature ( o c) current limit (a) vin =2.8v,vout=1.8v vin =3.3v,vout=1.8v application note input capacitor a 1 f ceramic capacitor is recommended to connect between in and gnd pins to decouple input power supply glitch and noise. the amount of the capacitance may be increased without limit. a lower esr (equivalent series resistance) capacitor allows the use of less capacitance, while higher esr type requires more capacitance. this input capacitor should be located as close as possible to the device to assure input stability and less noise. for pcb layout, a wide copper trace is required for both in and gnd. output capacitor the output capacitor is requir ed to stabilize and help the transient response of the ldo. the ap7168 is designed to have excellent transient res ponse for most applications with a small amount of output capacitance. the ap7168 is stable for all available types and values of output capacitors 4.7 f. the device is also stable with multiple capacitors in parallel, which c an be of any type of value. additional capacitance helps to reduce undershoot and overshoot during transient. this capacitor should be placed as close as possible to out and gnd pins for optimum performance. adjustable operation the ap7168 provides output vo ltage from 0.8v to 5.0v through external resistor divider as shown below. in gnd en out enable fb v in v out pok 100kohm r 1 r 2 ap7168 c in c out the output voltage is calculated by: ? ? ? ? ? ? ? ? += 2 1 ref out r r 1vv where v ref =0.8v (the internal reference voltage) rearranging the equation will give the following equation to find the approximate resistor divider values: ? ? ? ? ? ? ? ? ? = 1 v v rr ref out 21 to maintain the stability of the internal reference voltage, r 2 needs to be kept smaller than 250k .
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 8 of 11 www.diodes.com september 2010 ? diodes incorporated new product application note (continued) no load stability other than external resistor divider, no minimum load is required to keep the device stable. the device will remain stable and regulated in no load condition. enable/shutdown operation the ap7168 is turned on by setting the en pin high, and is turned off by pulling it low. if this feature is not used, the en pin should be tied to in pin to keep the regulator output on at all time. to ensure pr oper operation, the signal source used to drive the en pin must be able to swing above and below the specified turn-on/off voltage thresholds listed in the electrical characteristics section under v il and v ih . power-ok the power-ok (pok) pin is an active high open-drain output. it can be connected to any 5.5v or lower rail through an external pull-up resistor. the recommended sink current of pok pin is up to 4ma, so the pull-up resistor for pok should be in the range of 10k ? to 1m ? . if output voltage monitoring is not needed, the pok pin can be left floating. current limit protection when output current at out pin is higher than current limit threshold, the current limit pr otection will be triggered and clamp the output current to approximately 1.6a (1.2a min) to prevent over-current and to protect the regulator from damage due to overheating. short circuit protection when out pin is short-circuited to gnd or out pin voltage is less than 200mv, s hort circuit protection will be triggered and clamp the output current to approximately 750ma. this feature protects the regulator from over- current and damage due to overheating. low quiescent current the ap7168, consuming only around 150a for all input range and output loading, provides great power saving in portable and low power applications. wide output range the ap7168, with a wide output range of 0.8v to 5.0v, provides a versatile solution for many portable and low power applications. thermal shutdown protection thermal protection disables the output when the junction temperature rises to approximately +145c, allowing the device to cool down. when the junction temperature reduces to approximately +120c the output circuitry is enabled again. depending on power dissipation, thermal resistance, and ambient te mperature, the thermal protection circuit may cycle on and off. this cycling limits the heat dissipation of the r egulator, protecting it from damage due to overheating. power dissipation the device power dissipation and proper sizing of the thermal plane that is connected to the thermal pad is critical to avoid thermal shutdown and ensuring reliable operation. power dissipation of the device depends on input voltage and load conditions and can be calculated by: out out in d xi)vv(p ? = the ap7168 is available in the so-8ep packages, both with exposed pad, which is the primary conduction path for heat to the printed circuit bo ard (pcb). the pad can be connected to ground or be left floating; however, to ensure the device will not overheat, it should be attached to an appropriate amount of copper pcb area. however, the maximum power dissipation that can be handled by the device depends on the maximum junction to ambient thermal resistance, maximum ambient temperature, and maximum device junction temperature, which can be approximated by the equation below: ja a a d r )tc150( )t(max@p ? + =
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 9 of 11 www.diodes.com september 2010 ? diodes incorporated new product ordering information ? ap71 6 8- sp g -13 packing package green sp : so-8ep g : green 13 : tape & reel device package code packaging (note 5) 13? tape and reel quantity part number suffix ap7168-spg-13 sp so-8ep 2500/tape & reel -13 notes: 5. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at ht tp://www.diodes.com/ datasheets/ap02001.pdf. marking information so-8ep ( top view ) ap7168 yy ww x x logo part no. 5 8 4 1 e ww : week : 01~52; 52 yy : year : 08, 09,10~ g : green x : internal code represents 52 and 53 week sop-8l-ep
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 10 of 11 www.diodes.com september 2010 ? diodes incorporated new product package outline dimensions package type: so-8ep 1.27typ 0.3/0.5 7~9 4.85/4.95 3.85/3.95 5.90/6.10 0.15/0.25 7~9 3.70/4.10 0.62/0.82 0/0.13 gauge plane 0.254 seating plane 0.35max. 45 detail "a" detail "a" 1.30/1.50 1.75max. bottom view 2.4ref. 3.3ref. exposed pad 8x-0.60 land pattem recommendation (unit:mm) exposed pad 1 1 1 5.4 8x-1.55 6x-1.27 notes: 6. all dimensions are in millimeters. angles are in degrees. 7. coplanarity applies to the exposed heat sink slug as well as the terminals.
ap7168 1.2a low dropout re gulator with pok ap7168 document number: ds32019 rev. 2 - 2 11 of 11 www.diodes.com september 2010 ? diodes incorporated new product 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 rese rve the right to make modifications, enhanc ements, 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 an y product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of othe rs. 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 incorp orated website, harmless against all damages. diodes incorporated does not warrant or accept any liability what soever in respect of any prod ucts purchased through unauthoriz ed sales channel. should customers purchase or use diodes in corporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives har mless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death a ssociated 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 specifica lly not authorized for use as critical co mponents 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 pr operly used in accordance with instructions for use provided in the labeling can be reasonably expected to re sult 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 t he safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsi ble for all legal, regulatory and safety-related requirements concerning their products and any use of diode s incorporated products in such safety-cri tical, 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 ar ising out of the use of diodes incorporated products in such safety-c ritical, life support devices or systems. copyright ? 2010, diodes incorporated www.diodes.com

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