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| pam3101 document number: dsxxxxx rev. 2 - 5 1 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated 300ma high psrr low- dropout cmos linear regulator description the pam3101 series of positive voltage linear regulators feature low quiescent current (65a typ.) and low dropout voltage, making them ideal for battery powered applications. their high psrr make them useful in applications where ac no ise on the input power supply must be suppressed. space-saving tsot25, sot-23, sot-89, sc70 and dfn1.6x1.6-6l packages are attractive for portable and handheld applications. they have both thermal shutdown and current limit features to prevernt device failure from extreme operating conditions. they are stable with an output capacitor of 2.2f or greater. features ? low dropout voltage: 180mv@300ma (v o = 3.3v) ? output voltage accuracy within 2% ? supply voltage range: 2.5v to 5.5v ? quiescent current: 65a typ. ? high psrr: 70db@1khz ? excellent line and regulation ? fast discharge ? current limiting ? short circuit protection ? low temperature coefficient ? shutdown current: 0.5a ? thermal shutdown ? space saving packages: tsot25, sot-23, sot-89, sc70 and dfn1.6x1.6 ? pb-free packages applications ? cellular phones ? bluetooth earphones ? digital cameras ? portable electronics ? wlans ? mp3 players pin assignments top view tsot25
pam3101 document number: dsxxxxx rev. 2 - 5 2 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated typical applications circuit pin configuration and description package type pin number 1 2 3 4 5 6 sot23-3 gnd vout vin ? ? ? vin vout gnd ? ? ? vout gnd vin ? ? ? tsot25 vin gnd en byp vout ? vin gnd en nc vout ? sot89-3 gnd vin vout ? ? ? vout gnd vin ? ? ? sot89-5 vout gnd nc en vin ? sc-70-3l vin vout gnd ? ? ? sc70-4l en gnd vout vin ? ? sc70-5l vin gnd en byp vout ? dfn1.6x1.6-6l en nc vin vout nc gnd pin name function vin input gnd ground vout output en chip enable (active high) pam3101babxxx----en default floating other part no----en default pull high byp bypass pin, need a 10nf capacitor connect to gnd nc no connection pam3101 document number: dsxxxxx rev. 2 - 5 3 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated functional block diagram absolute maximum ratings (@t a = +25c, unless otherwise specified.) these are stress ratings only and functional operation is not implied. exposure to absolute maximum ratings for prolonged time periods may affect device reliability. all voltages are with respect to ground. parameter rating unit input voltage 6.0 v output current 300 ma output pin voltage gnd -0.3 to v in +0.3v v lead soldering temperature 300, (5sec) c storage temperature -65 to +150 c esd rating class b recommended operating conditions (@t a = +25c, unless otherwise specified.) parameter rating unit supply voltage range 2.5 to 5.5 v junction temperature -40 to +125 c operation temperature -40 to +85 pam3101 document number: dsxxxxx rev. 2 - 5 4 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated thermal information parameter symbol package max unit thermal resistance junction to case) jc tsot25/sot23 130 c/w sot-89 100 sc70 160 dfn1.6x1.6 65 thermal resistance (junction to ambient) ja tsot25/sot23 250 sot-89 180 sc70 300 dfn1.6x1.6 175 internal power dissipation (@t a = 25c) p d tsot25/sot23 400 mw sot-89 550 sc70 300 dfn1.6x1.6 570 electrical characteristics (@t a = +25c, v ce1 = v ce2 = v in = v o +1v, c in = 2.2f, c o = 2.2f, unless otherwise specified.) parameter symbol test conditions min typ max units input voltage v in note 1 5.5 v output voltage v o i o = 1ma -2 +2 % output current i o 300 note 2 ma dropout voltage v drop i o = 300ma v o = 1.5v 1150 1400 mv v o = 1.8v 850 1100 2.5v v o < 3.3v 370 450 v o 3.3v 180 230 ground current i gnd i o = 1ma to 300ma 70 90 a quiescent current i q i o = 0ma 65 90 a line regulation lnr i o = 1ma, v o < 2v, v in = 2.8v to 3.8v -0.15 0.10 0.15 %/v i o = 1ma, 2v v o < 3.3v, v in = v o +0.5v to v o +1v -0.10 0.03 0.10 i o = 1ma, v o 3.3v, v in = v o +0.5v to v o +1v -0.4 0.2 0.4 load regulation ldr i o = 1ma to 300ma, v o 2v -2 1 +2 % i o = 1ma to 300ma, v o < 2v 30 60 mv temperature coefficient t c i o = 1ma 40 ppm/c over temperature shutdown ots i o = 1ma 150 c over temperature hysteresis oth i o = 1ma 30 c power supply ripple rejection psrr i o = 100ma c byp = 10nf v o = 3.3v f = 100hz 70 db f = 1khz 65 output noise v n f = 10hz to 100khz, c byp = 10nf 50 v rms ce input high threshold v th v in = 2.5v to 5v 1.5 v ce input low threshold v tl v in = 2.5v to 5v 0.3 v shutdown current i sd v en = 0v 0.01 1 a notes: 1. the minimym inout voltage (v in(min ) of the pam3101 is determined by output voltage and dr opout voltage. the minimum input voltage is defined as: v in(min) = v o +v drop 2. output current is limited by p d , maximum i o = p d /(v in(max) ? v o ). pam3101 document number: dsxxxxx rev. 2 - 5 5 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated typical performance characteristics (@t a = +25c, v en = v in , c in = 1f, c o = 2.2f, c byp = 10nf unless otherwise specified.) pam3101 document number: dsxxxxx rev. 2 - 5 6 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, v en = v in , c in = 1f, c o = 2.2f, c byp = 10nf unless otherwise specified.) pam3101 document number: dsxxxxx rev. 2 - 5 7 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, v en = v in , c in = 1f, c o = 2.2f, c byp = 10nf unless otherwise specified.) pam3101 document number: dsxxxxx rev. 2 - 5 8 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, v en = v in , c in = 1f, c o = 2.2f, c byp = 10nf unless otherwise specified.) pam3101 document number: dsxxxxx rev. 2 - 5 9 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, v en = v in , c in = 1f, c o = 2.2f, c byp = 10nf unless otherwise specified.) pam3101 document number: dsxxxxx rev. 2 - 5 10 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated typical performance characteristics (cont.) (@t a = +25c, v en = v in , c in = 1f, c o = 2.2f, c byp = 10nf unless otherwise specified.) pam3101 document number: dsxxxxx rev. 2 - 5 11 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated application information capacitor selection and regulator stability similar to any low dropout regulator, the external capacitors used with the pam3101 must be carefully selected for regulator st ability and performance. a capacitor c in of more than 1 f can be employed in the input pin, while there is no upper limit for the capacitance of cin. please note that the distance between c in and the input pin of the pam3101 should not exceed 0.5 inch. ceramic capacitors are suitable for the pam3101. capacitors with larger values and lower esr (equivalent seri es resistance) provide better psrr and line-transient response. the pam3101 is designed specifically to work with low esr cerami c output capacitors in order to save space and improve performa nce. using an output ceramic capacitor whose value is >2.2 f with esr>5m ? ensures stability. a 10nf bypass capacitor connected to byp pi n is suggested for suppressing output noise. the capacitor, in series connection wit h an internal 200k ? resistor, forms a low-pass filter for noise reduction. incr easing the capacitance will slight ly decrease the output noise, but increase the start-up time. load transient consideration curve 10 of the pam3101 load-transient response on page 10 shows two components of the output response: a dc shift from the out put impedance due to the load current change and transient response. the dc shift is quite small due to excellent load regulation o f the pam3101. the transient spike, resulting from a step change in the load curre nt from 1ma to 300ma, is 20mv. the esr of the output capacit or is critical to the transient spike. a larger capacitance with smaller esr results in a smaller spike. shutdown input operation the pam3101 is shut down by pulling the en input low, and is turned on by tying the en input to v in . internal p-channel pass transistor the pam3101 features a 0.75 ? p-channel mosfet device as a pass transistor. the pmos pass transistor enables the pam3101 to consume only 65 a of ground current during low dropout, light-load, or heavy-load operations. this feature increases the battery operation life time. input-output (dropout) voltage a regulator's minimum input-output voltage difference (or dropout voltage) determines the lowest usable supply voltage. the pam 3101 has a typical 300mv dropout voltage. in battery powered systems, this will determine the useful end-of-life battery voltage. current limit and short circuit protection the pam3101 features a current limit, which monitors and controls the gate voltage of the pass transistor. the output current c an be limited to 400ma by regulating the gate voltage. the pam3101 al so has a built-in short circuit current limit. thermal considerations thermal protection limits power dissipation in the pam3101. when t he junction temperature exceeds +150c, the otp (over tempera ture protection) starts the thermal shutdown and turns the pass tr ansistor off. the pass transistor resumes operation after the junc tion temperature drops below +120c. for continuous operation, the junction te mperature should be maintained below +125 c. the power dissipation is defined as: i * vi * vvp gndinoout ind the maximum power dissipation depends on the thermal resistance of ic package, pcb layout, the rate of surrounding airflow and temperature difference between junction and ambient. the maximum power di ssipation can be calculated by the following formula: t ja a)max(j)max(d / tt p where t j(max) is the maximum allowable junction temperature +125c , t a is the ambient temperature and ja is the thermal resistance from the junction to the ambient. pam3101 document number: dsxxxxx rev. 2 - 5 12 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated application information (cont.) for example, as ja is 250c/w for the sot-23 package and 180c/w for the so t-89 package based on the standard jedec 51-3 for a single- layer thermal test board, the maximum power dissipation at t a +25c can be calculated by following formula: w4.0250/c25c125 p )max(d q q sot-23 w55.0180/c25c125 p )max(d q q sot-89 it is also useful to calculate the junction temperature of the pam3101 under a set of specific conditions. suppose the input vo ltage v in = 3.3v, the output current i o = 300ma and the case temperature t a = +40c measured by a thermalcouple dur ing operation, the power dissipation for the v o = 2.8v version of the pam3101 can be calculated as: mw150a70*v3.3ma300*v8.2v3.3 p d # p and the junction temperature, t j can be calculated as follows: t j = t a + p d * ja t j = 40c +0.15w*250c/w = 40c +37.5c = 77.5c pam3101 document number: dsxxxxx rev. 2 - 5 14 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated ordering information (cont.) pam3101 document number: dsxxxxx rev. 2 - 5 15 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated ordering information (cont.) pam3101 document number: dsxxxxx rev. 2 - 5 16 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated ordering information (cont.) pam3101 document number: dsxxxxx rev. 2 - 5 17 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated ordering information (cont.) pam3101 document number: dsxxxxx rev. 2 - 5 18 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated marking information top view tsot25 pam3101 document number: dsxxxxx rev. 2 - 5 19 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) sot23-3 pam3101 document number: dsxxxxx rev. 2 - 5 20 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated package outline dimensions (cont.) (all dimensions in mm.) tsot25 pam3101 document number: dsxxxxx rev. 2 - 5 21 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated package outline dimensions (cont.) (all dimensions in mm.) pam3101 document number: dsxxxxx rev. 2 - 5 22 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated package outline dimensions (cont.) (all dimensions in mm.) pam3101 document number: dsxxxxx rev. 2 - 5 23 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) pam3101 document number: dsxxxxx rev. 2 - 5 24 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f diodes incorporated package outline dimensions (all dimensions in mm.) dfn 1.6x1.6-6l pam3101 document number: dsxxxxx rev. 2 - 5 25 of 25 www.diodes.com october 2012 ? diodes incorporated pam3101 a product line o f 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 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 arising out of the application or use of this document or an y product described herein; neither does di odes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er 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 whatsoever 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 foreign patents pending. product names and markings noted herein may also be covered by one or more united 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 released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical component s 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 proper ly 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 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 ? 2013, diodes incorporated www.diodes.com |
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