AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 1 of 10 www.diodes.com january 2011 ? diodes incorporated new product description the AP5727 is a high efficiency boost converter in a compact sot25 that provides the bias voltages for oled sub display and tft-lcd (liquid crystal display). a high 1.2mhz switching frequency and internal compensation minimizes external part count, pcb area and cost. integrated soft start reduces inrush current. the AP5727 has a 1.25v feedback voltage making it compatible with industry standard boost converters used to bias lcd panels. pin assignments 1 2 3 7 4 5 fb sw ( top view ) v in gnd sot25 en features ? 30v high output voltage ? fast 1.2mhz switching frequency ? current limit and uvlo protections ? internal thermal shutdown ? maximum 1a shutdown current ? integrated soft-start function ? sot25: available in ?green? molding compound (no br, sb) ? lead free finish/rohs compliant (note 1) applications ? small size tft-lcd bias power supply. ? oled bias supply for a clamshell handset sub display ? rf amplifier bias voltages notes: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http://www.dio des.com/products/l ead_free.html. typical application circuit v in sw en gnd fb AP5727 c out 10uf r2 l1 22uh d1 v in c in 4.7uf r1 v out figure 1. typical application circuit
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 2 of 10 www.diodes.com january 2011 ? diodes incorporated new product functional block diagram 1.2mhz oscillator ramp generator - + - + - + v ref 1.25v v in 3 fb r c c c comparator a2 r s q a1 1 driver sw q1 2 gnd 4 en shutdown 5 figure 2. block diagram pin descriptions name description sw switch pin. connect inductor/diode here. minimize trace area at this pin to reduce emi. gnd gnd pin fb feedback pin. reference voltage is 1.25v. en regulator on/off control input. a high input at en turn s on the converter, and a low input turns it off. when not used, connect en to the input source for automat ic startup. the en pin cannot be left floating. v in input supply pin. must be locally decoupled - 4.7 f recommended to reduce input noise.
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 3 of 10 www.diodes.com january 2011 ? diodes incorporated new product absolute maximum ratings (t a = 25 c) symbol parameter rating unit v in vin pin voltage -0.3~7 v v sw sw voltage -0.3~32 v v fb feedback pin voltage -0.3~7 v en en -0.3~7 v t j(max) maximum junction temperature 150 c t lead lead temperature 300 c t st storage temperature range -65 to +150 c caution: the absolute maximum ratings are rated values exceeding which the product could suffer physical damage. these values m ust therefore not be exceeded under any condition. recommended operating conditions symbol parameter min max unit v in input voltage 2.7 5.5 v t j operating junction temperature -40 125 c t a operating ambient temperature -40 85 c electrical characteristics (v in = 3.6v, t a = 25 c, unless otherwise specified) symbol parameter conditions min. typ. max. unit system supply input v in operating input voltage 2.7 - 5.5 v uvlo under voltage lockout - 2.2 2.4 v under voltage lockout hysteretic - 85 - mv i q quiescent current fb=1.3v, no switching - 500 - a i sd shutdown current v en < 0.4v - 0.1 1 a oscillator f osc operation frequency 1 1.2 1.4 mhz dmax maximum duty cycle 86 90 - % reference voltage v fb feedback voltage 1.225 1.25 1.275 v i fb fb pin bias current 10 45 100 na mosfet r ds(on) on resistance of mosfet - 0.95 1.2 ? i ocp switching current limit normal operation - 750 - ma control and protection en voltage high on 1.5 - - v en voltage low off - - 0.4 v i en en pin pull low current - 4 6 a ja thermal resistance junction-to- ambient sot25 (note 2) 162 o c/w jc thermal resistance junction-to- case sot25 (note 2) 36 o c/w notes: 2. test condition for sot25: device mounted on fr-4 substrate, single-layer pc board, 2oz copper, with minimum recom mended pad layout
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 4 of 10 www.diodes.com january 2011 ? diodes incorporated new product typical performance characteristics (v in 3.3v; v out = 15v i out = 20ma) v in vs. shutdown current 0 0.02 0.04 0.06 0.08 0.1 2.5 3 3.5 4 4.5 5 5.5 v in (v) shutdown current(ua) v in vs. quiescent current 0 100 200 300 400 500 600 700 800 2.533.544.555.5 v in (v) quiescent current(ua) v in vs. frequency 1 1.1 1.2 1.3 1.4 2.5 3 3.5 4 4.5 5 5.5 v in (v) frequency(mhz) v in vs. max duty 80 85 90 95 100 2.5 3 3.5 4 4.5 5 5.5 v in (v) max duty (%) v in vs. feedback voltage 1.22 1.23 1.24 1.25 1.26 1.27 2.533.544.555.5 v in (v) feedback voltage(v) i out vs. feedback voltage 1.22 1.23 1.24 1.25 1.26 1.27 0 1020304050 i out (ma) feedback voltage(v)
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 5 of 10 www.diodes.com january 2011 ? diodes incorporated new product typical performance characteristics (v in 3.3v; v out = 15v i out = 20ma) temperature vs. shutdown current 0 0.4 0.8 1.2 1.6 2 -50 -25 0 25 50 75 100 125 temperature ( ) shutdown current(ua) temperature vs. frequency 0.5 0.8 1.1 1.4 1.7 -50 -25 0 25 50 75 100 125 temperature ( ) frequency (mhz) temperature vs. feedback voltage 1.2 1.22 1.24 1.26 1.28 1.3 -50 -25 0 25 50 75 100 125 temperature ( ) feedback voltage(mv) i out (ma) vs. efficiency (%) 50 55 60 65 70 75 80 85 90 0 20406080 i out (ma) efficiency(%) v in = 3.3v v in = 3.6v v in = 4.2v v in = 5v
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 6 of 10 www.diodes.com january 2011 ? diodes incorporated new product typical performance characteristics (continued) v out ripple v in = 3.3v; vout = 15v ; iout = 5ma v out ripple v in = 3.3v; vout = 15v ; iout = 50ma power on v in = 3.3v; vout = 15v ; iout = 50ma power off v in = 3.3v; vout = 15v ; iout = 50ma sw n v en v out i l v out sw v out v en v out i l
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 7 of 10 www.diodes.com january 2011 ? diodes incorporated new product typical performance characteristics (continued) load transient response v in = 3.3v; vout = 15v ; iout = 5~50ma application information inductor selection a 10 h~22 h inductor is recommended for most AP5727 applications. although small size and high efficiency are major concerns, the inductor should have low core loss at 1.2mhz and low dcr. capacitor selection ceramic capacitors, due to their small size, are ideal for AP5727 applications. x5r and x7r types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as x5r and x7r. a 4.7 f input capacitor and a 10 f output capacitor are sufficient for most AP5727 applications. diode selection schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for AP5727 applications. the forward voltage drop of a schottky diode represents the c onduction loss in the diode, while the diode capacitance (c t ) represents the switching loss. for diode selection, both forward voltage drop and di ode capacitance need to be considered. schottky diodes with higher current ratings usually have lo wer forward voltage drop and larger diode capacitance, which can cause significant switching loss at the 1.2mhz switching frequency of the AP5727. v out i out
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 8 of 10 www.diodes.com january 2011 ? diodes incorporated new product application circuit u1 AP5727 1 2 3 5 4 sw gnd fb vin en cout 10uf cin 4.7uf d1 b0540ws vout r1 11k r2 1k vin l1 22uh 1 2 table 1. suggested inductors vendor inductors (uh) current rating (a) type dimensions (mm) series wurth electronics 22 0.51a smd 3.8x 3.8 x 1.6 744031220 gotrend 22 0.56a smd 3.8 x 3.8 x 1.05 glp3810ph220n taiyo yuden 22 0.51a smd 4.0 x 4.0 x 1.25 nr4012 table 2. suggested capacitors for c in and c out vendor capacitance type series taiyo yuden 4.7uf smd lmk316 b7 475kl-t taiyo yuden 10uf smd lmk316 f 106zl-t table 3. suggested diodes vendor rating type series zetex 40v/0.5a sod323 zlls400 diodes 40v/0.5a sod323 b0540ws diodes 40v/0.25a sod523 sdm20u40 table 4. suggested resistor v endo r type series yageo smd fr-sk ordering information package ap 5727 w g - 7 packing 7 : tape & reel green g : green w : sot25 device package code packaging (note 3) 7? tape and reel quantity part number suffix AP5727wg-7 w sot25 3000/tape & reel -7 note: 3. pad layout as shown on diodes inc. suggested pad layout doc ument ap02001, which can be found on our website at http://www.diodes .com/datasheets/ap02001.pdf.
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 9 of 10 www.diodes.com january 2011 ? diodes incorporated new product marking information (1) sot25 1 2 3 5 7 4 xx y w x ( top view ) xx : identification code y : year 0~9 x : a~z : green w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week part number package identification code AP5727 sot25 h8 package outline dimensions (all dimensions in mm) (1) package type: sot25
AP5727 bias power supply for oled sub display and tft-led AP5727 document number: ds31887 rev. 2 - 2 10 of 10 www.diodes.com january 2011 ? 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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