PAM2401 document number: ds37285 rev. 1 - 2 1 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated 1.0mhz step-up dc-dc converter description the PAM2401 is a high efficiency, current mode, fixed frequency, step-up dc/dc converter with true output disconnect and inrush current limiting. the device includes one 0.10 ? n-channel mosfet switch and one 0.15 ? p-channel synchronous rectifier. this product has the ability to simply program the output voltage from 2.5v to 5.0v.the switching frequency is 1.0mhz, programmable current limit set by an external resistor from 1.0a to 3.0a with internal soft-start. when loading became light, the converter will automatically enter into psm to improve the efficiency. quiescent current is only 150a during pulse skip mode operation, maximizing battery life in portable app lications. other features include : <1a shutdown, anti-ringing control, hiccup mode at short protection, over voltage protection and over temperature protection. the PAM2401 is available in msop-8 and u-dfn3030-12 packages features ? up to 95% efficiency ? true output disconnect ? inrush current limiting when power on ? output current up to 1000ma at v in = 3v and v out = 5.0v ? fixed frequency operation up to 1mhz ? 0.9v to 4.75v input range ? 2.5v to 5.0v adjustable output voltage ? guaranteed 1.0v start-up ? programmable current limit ? internal soft-start ? internal compensation ? pulse sipping mode at light load operation ? hiccup mode short protection ? over voltage protection ? over temperature protection ? <1a shutdown current ? power good indicator ? msop-8 and u-dfn3030-12 packages ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments applications ? handheld computers ? cordless phones ? gps receivers ? battery backup supplies notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more in formation about diodes incorporated?s definitions of halogen- a nd antimony-free, "green" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds.
PAM2401 document number: ds37285 rev. 1 - 2 2 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated typical applications circuit pin descriptions msop-8 u-dfn3030-12 name function 1 1,2 lx switch pin 2 3 en enables control input. 3 4 vin input voltage pin -- 5 pg power good indicator pin, open drain output 4 6 agnd analog ground 5 7 fb feedback pin internally set to 0.6v. 6 8 rset current limit setting 7 9,10 out output pin 8 11,12 pgnd power ground exposed pad ep thermal pad of the package. can be connected to pgnd functional block diagram
PAM2401 document number: ds37285 rev. 1 - 2 3 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated absolute maximum ratings (@t a = +25c, unless otherwise specified.) these are stress ratings only and functional operation is not implied. exposure to absolute maximum rati ngs for prolonged time periods may affect device reliability. all voltages are with respect to ground. parameter rating unit input voltage -0.3 to +6.0 v sw voltage -0.3 to +6.0 v shdn, fb voltage -0.3 to +6.0 v v out -0.3 to +6.0 v operating temperature range -40 to +85 c storage temperature range -65 to +125 c lead temperature (soldering, 10 sec) 300 c recommended operating conditions (@t a = +25c, unless otherwise specified.) parameter rating unit ambient temperature range -40 to +85 c junction temperature range -40 to +125 thermal information parameter package symbol max unit thermal resistance (junction to case) msop-8 jc 75 c/w u-dfn3030-12 8.5 thermal resistance (junction to ambient) msop-8 jc 180 u-dfn3030-12 60 internal power dissipation msop-8 p d 0.55 w u-dfn3030-12 1.66
PAM2401 document number: ds37285 rev. 1 - 2 4 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated electrical characteristics (t a = +25c, v in = 3.3v, v out = 5v, l = 2.2h, unless otherwise noted.) parameter symbol test conditions min typ max units input voltage range v in no load, v o = 5v 0.9 4.75 v i o =1a , v o = 5v 2.7 4.75 minimum startup voltage v startup i o = 0.1a, v o = 3.3v 1 v shutdown supply current i sd 0.1 1 a quiescent current iq no load, switching (measured with external feedback); v o = 5v 150 a oscillator frequency f osc 0.8 1 1.2 mhz maximum duty cycle d max 87.5 % output-voltage adjust range v o 2.5 5 v fb regulation voltage v fb no load 0.588 0.6 0.612 v load regulation ldr i out = 1ma to 1000ma 2.5 % line regulation lnr v o = 2.5v to 4.75v, i o = 0.5a 0.3 %/v drain-source on-state resistance r ds(on) p mosfet 150 250 m ? n mosfet 100 170 m ? n-channel current limit (note) i limit r set floating or r set > 200k ? 3 a r set = 100k ? 1.5 a r set = 66k ? 1 a pre-charge current i-charge v out +0.5v < v in 500 ma pre-charge time t-charge v out +0.5v < v in 400 s sw leakage current ilsw 0.1 2 a power good threshold vpg 92 % en threshold high v h v in = 0.9v 0.8 v v h v in = 3.3v 1.5 en threshold low v l v in > 1.2v 0.2 v over temperature threshold totsd 160 c over temperature hysteresis thys 50 c note: n-channel current limit is guaranteed by design.
PAM2401 document number: ds37285 rev. 1 - 2 5 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated application information output voltage set equation the output voltage of the PAM2401, v out , is set by an external resistor di vider from vout to ground as show n in figure 1. the divider tap is connected to the fb pin and the typical value of the voltage at the fb pin is 0.6v. the following equation is used to set the v out : v out = 0.6 (1+r1/r2) for example, if output voltage of 5v is needed, with a chosen r2 value of 100k ? ,the value of r1 can be calculated according to the equation, so a 750k ? resistor should be chosen for r1. inductor selection to select an inductor for use in PAM2401 applications, it is wo rth noting that the inductor cu rrent saturation rating should be larger than the possible peak inductor current to ensure proper operation, and s hould have low dcr (dc resistance). using an inductor the satur ation current of which is lower than required can cause a dr amatic drop in the inductance and can decay the maximum output current levels severe ly. for most applications, the value of the inducto r should be in the range ofs 1h to 4.7h. its value is chosen based on the desired ri pple current. larger value inductors result in lower ripple currents, and smalle r value inductors result in higher ripple currents. a 1.5h o r 2.2h inductor will be the best choice for most PAM2401 applications. the following eq uation can also help give a good approximate value for the ind uctor. = ilxf v inxd l d duty cycle=1-v in /v out , f switching frequency = 1.0mhz, ? il ripple current in the inductor, i.e., 20% to 40% of the maximum inductor current (ip). output and input capacitor selection input capacitor at least a 10f input capacitor is recommended to reduce the input ripple and switching noise for normal operating conditions, while a 10-22f capacitor may be required for higher power and dynamic loads. larger values and lower esr (equivalent series resistance) may be needed if the application require very low input ripple. it follows that ceramic capacitors are a good choice for applications. note that the input capacitor should be located as close as possible to the ic. output capacitor a minimum output capacitor value of 22f is recommended and may be increase to a larger value. the esr of the output capacitor is important because it determines the peak to peak output voltage ripple by the following equation: xresr il v out >> 2 multilayer ceramic capacitors are an excellent choice as they have extremely low es r and are available in small footprints.
PAM2401 document number: ds37285 rev. 1 - 2 6 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated typical performance characteristics (t a = +25c, v in = 3.3v, v out = 5v, unless otherwise noted.) 0 100 200 300 400 500 600 700 800 900 1000 50 55 60 65 70 75 80 85 90 95 100 efficiency (%) output current (ma) vin=3.3v vin=4.5v figure 4 efficiency vs. output current (msop-8) 0 100 200 300 400 500 600 700 800 900 1000 50 55 60 65 70 75 80 85 90 95 100 efficiency (%) output current (ma) vin=3.3v vin=4.5v figure 5 efficiency vs. output current (u-dfn) 0 100 200 300 400 500 600 700 800 900 1000 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 5.25 5.30 5.35 5.40 output voltage (v) output current (ma) vin=3.3v vin=4.5v figure 6 output voltage vs. output current 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 maximun output current ability (ma) input voltage (v) vout=3.3v vout=3.6v vout=4.2v vout=5v test on steady state figure 7 maximum output current vs. input voltage 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 inductor current limit (a) rset resistance (kohm) vin=3.3v, vo=5v figure 8 inductor current limit vs. rset resistance -40-30-20-10 0 102030405060708090100110120 90 100 110 120 130 140 150 160 dynamic supply current (ua) temperature (oc) vin=4.5v,vo=5v,io=0a figure 9 dynamic supply current vs. temperature
PAM2401 document number: ds37285 rev. 1 - 2 7 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated typical performance characteristics (cont.) (t a = +25c, v in = 3.3v, v out = 5v, unless otherwise noted.) 0 100 200 300 400 500 600 700 800 900 1000 1100 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 minimum startup input voltage(v) output current(ma) vo=3.3v vo=3.6v vo=4.2v vo=5v figure 10 minimum startup input voltage vs. output current figure 11 enable turn on (i o = 1a) (ch1: enable; ch2: v out ; ch3:sw; ch4: i o ) figure 12 enable turn off (i o = 1a) (ch1: enable; ch2:v out ; ch3:sw; ch4:io) figure 13 output ripple (i o = 0a) (ch1:sw; ch2: v out-ac ; ch4:il) figure 14 output ripple (i o = 0.2a) (ch1: sw; ch2:v out - ac ; ch4:il) figure 15 v out short protection (i o = 1a) (ch2:v out ; ch3:il) figure 16 v out short recovery (i o = 1a) (ch2: v out ; ch3: il )
PAM2401 document number: ds37285 rev. 1 - 2 8 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated ordering information PAM2401 x x xxx s: msop-8 y: u-dfn3030-12 c: 8 p: 12 adj: adj part number marking package type standard package PAM2401scadj p2401 xxxyw msop-8 2,500 units/ tape & reel PAM2401ypadj p2401 xxxyw u-dfn3030-12 3,000 units/ tape & reel marking information top view u-dfn3030-12 number of pins output voltage package type
PAM2401 document number: ds37285 rev. 1 - 2 9 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) please see ap02002 at http://www.diodes.com/dat asheets/ap02002.pdf for the latest version. (1) msop-8 (2) u-dfn3030-12 suggested pad layout please see ap02001 at http://www.diodes.com/dat asheets/ap02001.pdf for the latest version. (1) msop-8 msop-8 dim min max typ a - 1.10 - a1 0.05 0.15 0.10 a2 0.75 0.95 0.86 a3 0.29 0.49 0.39 b 0.22 0.38 0.30 c 0.08 0.23 0.15 d 2.90 3.10 3.00 e 4.70 5.10 4.90 e1 2.90 3.10 3.00 e3 2.85 3.05 2.95 e - - 0.65 l 0.40 0.80 0.60 a 0 8 4 x - - 0.750 y - - 0.750 all dimensions in mm u-dfn3030-12 dim min max typ a 0.57 0.63 0.60 a1 0 0.05 0.02 a3 ? ? 0.15 b 0.18 0.28 0.23 d 2.90 3.10 3.00 d2 2.30 2.50 2.40 e ? ? 0.45 e 2.90 3.10 3.00 e2 1.50 1.70 1.60 l 0.25 0.55 0.40 all dimensions in mm dimensions value (in mm) c 0.650 x 0.450 y 1.350 y1 5.300 a a1 a2 e seating plane gauge plane l see detail c detail c c a e1 e3 a3 1 e y x d b 0.25 4 x 1 0 4 x 1 0 seating plane a3 a a1 pin#1 id l e e2 d d2 e b x c y y1
PAM2401 document number: ds37285 rev. 1 - 2 10 of 10 www.diodes.com may 2014 ? diodes incorporated PAM2401 new product a product line o f diodes incorporated suggested pad layout (cont.) please see ap02001 at http://www.diodes.com/dat asheets/ap02001.pdf for the latest version. (2) u-dfn3030-12 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 descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or any product described herein; neither does diodes inco rporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such applica tions 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 w hatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or fore ign patents pending. product names and markings noted herein may also be covered by one or more un ited states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of t his document is the final and determinative format rel eased by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical com ponents in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems 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 prope rly 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 devic e or system whose failure to perform can be reasonably expect ed 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 ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2014, diodes incorporated www.diodes.com dimensions value (in mm) z 2.60 g 0.15 x 1.80 x1 0.60 y 0.28 c 0.45 c y z x x1 g g
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