january 2015 exar corporation 48720 kato road, fremont ca 94538, usa general description the xrp6275 is an ultr a low dropout voltage regulator capable of delivering 3a currents. it is unique in the industry in being able to operate from a single supply rail of 1.045v to 2.625v without the need for a noise generating charge pump. with its ultra low dropout voltage of 138 full load guaranteed over temperature, the xrp6275 achieves c onversions previously unavailable. the output voltage can be set as low as 0.6v with 0.5% accuracy making the perfectly suited for powering low voltage devices such as fpgas, dsps, asics, and other socs. built- in current limit, reverse bias and protection ensures safe operation under abnormal operating conditions. an enable function, soft start and power good flag complete the feature set. the xrp6275 is offered in rohs compliant, green/halogen free 10- pin 3x3mm package. typical application diagram 3a ultra low dropout voltage regulator 48720 kato road, fremont ca 94538, usa tel. +1 510 668-7000 C fax. +1 510 668 a low dropout voltage delivering 3a output unique in the industry in being able to operate from a single supply rail of 1.045v to 2.625v without the need for a noise ultra low dropout voltage of 138 mv at full load guaranteed over temperature, the onversions previously the output voltage can be set as low as 0.6v making the xrp6275 perfectly suited for powering low voltage devices such as fpgas, dsps, asics, and in current limit, reverse bias and thermal protection ensures safe operation under abnormal operating conditions. an enable function, soft start and power good flag offered in rohs compliant, pin 3x3mm dfn features 3a output current 1.045v to 2.625 v single input voltage - adjustable output voltage - 0.5 output voltage accuracy ultra low dropout voltage - 138 mv max over temp @ 3 - 74mv max over temp @ 2a power good flag enable & soft start current limit and thermal reverse bias protection rohs compliant green/halogen free - 10- pin 3mm x 3mm dfn applications point of load conversion microprocessors, dsps, fpgas supplies networking & telecom equipment switching supplies post regulation diagram fig. 1: xrp6275 application diagram xrp6275 xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 www.exar.com fax. +1 510 668 -7001 v single input voltage adjustable output voltage 0.6v output voltage accuracy ultra low dropout voltage mv max over temp @ 3 a 74mv max over temp @ 2a current limit and thermal protection protection green/halogen free pin 3mm x 3mm dfn point of load conversion microprocessors, dsps, fpgas supplies networking & telecom equipment switching supplies post regulation
? 2015 exar corporation absolute maximum rat ings these are stress ratings only and functional operat ion of the device at these ratings or above any other indicated in the operation sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. input voltage v in , v pgood ................................ enable voltage v en ................................ .... storage temperature .............................. junction temperature ................................ lead temperature (soldering, 5 sec) ..................... esd rating (hbm - human body model) .................... esd rating (cdm C charged device model) electrical specifica tions specifications are for an operating junction temperature of junction temperature range are denoted by a and are provided for reference purposes only. unles s otherwise indicated, v c out = 47f, t a = 25c. parameter min. input voltage operating range 1.045 maximum output current 1 3 ground current shutdown current adj pin voltage 598.5 594.0 597.0 592.0 596.0 590.7 dropout voltage output voltage load regulation power supply rejection ratio (psrr) output noise voltage current limit 3.3 reverse bias protection v out leakage current thermal shutdown temperature thermal shutdown hysteresis start up time power good threshold 92 power good threshold hysteresis pgood output low 3a ultra low dropout voltage regulator 2/11 ings these are stress ratings only and functional operat ion of any other of those sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect ................................ ............ 3v .... vin+0.5v3v -65c to 150c ................................ .......... 150c ..................... 260c .................... 2kv .............. 1kv operating ratings input voltage range v in , v en , v pgood junction temperature range .................... thermal resistance jc dfn10 .............................. thermal resistance ja dfn10 .......................... tions an operating junction temperature of t j = t a = 25c only; limits applying over the full operatin g junction temperature range are denoted by a ?. typical values represent the most likely parametric norm at t and are provided for reference purposes only. unles s otherwise indicated, v in = v out + 0.5 v and i typ. max. units conditions 2.625 v ? a 2.0 ma en active 2.5 6.0 ma en active , i out =3a 12 a v en =0v, i out =0ma, pgood floating 601.5 604.5 mv v in =2.5v, v out >1v 606.0 mv ? 600.0 603.0 mv v in =1.8v 605.0 mv ? 599.0 602.0 mv v in =1.35v 604.0 mv ? 138 mv ? i out =3a, v out =1.0v (note 2) 74 mv ? i out =2a, v out =1.35v (note 2) 0.25 % v in =v out + 0.5v, 20ma 35 db f=1khz 30 db f>300khz 200 v rms 10hz-100khz 4.7 a v out = 0.9 v out(nom) -10 a v in =0v, v out =2.625v 160 c 30 c 2 ms v out =1.0v 94 97 % of v out ? v out rising 2.8 % of v out v out falling 0.4 v ? vin>1.5v, i sink =1ma 0.4 v ? vin>1.045v, i sink =100ua xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 pgood ........... 1.045v-2.625v .................... -40c to 125c .............................. 6c/w .......................... 40.5c/w = 25c only; limits applying over the full operatin g likely parametric norm at t j = 25c, v and i out =20ma, c in = 47f, conditions =0ma, pgood floating =1.0v (note 2) =1.35v (note 2) + 0.5v, 20ma i out 3a out(nom) =1ma =100ua
? 2015 exar corporation parameter min. enable pin specifications enable threshold voltage 0.43 en sink current maximum allowable en sink current en source current note 1: the xrp6275 is rated over a junction temperature range conditions, t j has to be calculated in order to make sure it does not exceed maximum specification. use equation t (p d . ? ja ) where ? ja is the package thermal impedance, calculated from p d =(v in -v out ).i out note 2: dropout voltage is defined as the input to output v oltage differential (v enough to cause the output voltage to drop 2% from the nominal value. block diagram 3a ultra low dropout voltage regulator 3/11 typ. max. units conditions 0.55 0.67 v ? v en rising 2.5 ua en ? 2015 exar corporation pin assignment pin description name pin # en 2 enable input pin. thi compatibility. must be asserted high after vin reaches its minimum operating range. for automatic startup en must be sequenced with respect to vin as shown in application circuit. vin 3, 4 power input pin. ceramic capacitor. pgood 1 power good open drain output. resistor. vout 7, 8 regulator output pin. greater ceramic capacitor. adj 9 adjustable pin. connect to a resistive voltage divider to set the o utput voltage of the device. pgnd 5, 6 power ground ther. pad --- connect to agnd 10 signal ground. connect with a separate trace to the ground of the output being regulated. ordering information part number junction temperature range xrp6275eh-f -40ct j +125c XRP6275EHMTR-F xrp6275ehtr-f xrp6275evb xrp6275 evaluation board yy = year C ww = work week C x = lot number 3a ultra low dropout voltage regulator 4/11 3mm x 3mm dfn-10 fig. 3: xrp6275 pin assignment description enable input pin. thi s is a high impedance mos input with compatibility. logic high enables the device; logic low disables t he device. must be asserted high after vin reaches its minimum operating range. for automatic startup en must be sequenced with respect to vin as shown in application circuit. do not pull this pin higher than vin+0.5v. power input pin. must be closely decoupled to p gnd pin with a ceramic capacitor. power good open drain output. when used it should be pulled up to vin with a resistor. typical resistor value 100k. regulator output pin. must be closely decoupled to p gnd pin with a greater ceramic capacitor. adjustable pin. connect to a resistive voltage divider to set the o utput voltage of the device. ground connect to pgnd. ground. connect with a separate trace to the ground of the output being regulated. temperature marking package packing quantity note 1 +125c 6275e yyww xxxxx 10-pin dfn bulk halogen free 250/tape & reel 3k/tape & reel xrp6275 evaluation board x = lot number when applicable. xrp6275 dfn-10 xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 s is a high impedance mos input with cmos logic level logic high enables the device; logic low disables t he device. en must be asserted high after vin reaches its minimum operating range. for automatic startup en must be sequenced with respect to vin as shown in gnd pin with a 4.7f or greater when used it should be pulled up to vin with a gnd pin with a 4.7f or connect to a resistive voltage divider to set the o utput voltage of the device. ground. connect with a separate trace to the ground of the output being note 1 note 2 halogen free 3amp adjustable
? 2015 exar corporation typical performance characteristics all data taken at v in = v out +0.5v, t j = t information section of this datasheet. fig. 4: vadj versus iout, 1.5v in fig. 6: transient response, 20ma- 3a, 1.5vin, 1vout fig. 8 : ilimit versus temperature 0.590 0.595 0.600 0.605 0.610 0.00 0.50 1.00 1.50 2.00 vadj(v) iout (a) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40 -20 0 20 40 60 80 ilimit(a) tj (c) vin=1.5v vin=2.625v vout, 50mv/div ac coupled iout, 1a/div 40us/div 67mv undershoot ?i/?t=2a/us 3a ultra low dropout voltage regulator 5/11 characteristics = t a = 25c, unless otherwise specified - schematic and bom from application in , 1vout fig. 5: short-circuit , 1.5vin, 1vout 3a, 1.5vin, 1vout fig. 7: transient response, 1a- 3a, 1.5vin, 1vout ilimit versus temperature fig. 9 : enable threshold versus temperature 2.50 3.00 100 120 0.0 0.2 0.4 0.6 0.8 1.0 -40 -20 0 20 40 60 en threshold (v) tj ( c) vin, 1v/div vout, 0.5v/div iout, 2a/div 2ms/div vout, 50mv/div ac coupled iout, 1a/div 20us/div 40 mv undershoot ?i xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 schematic and bom from application , 1.5vin, 1vout 3a, 1.5vin, 1vout enable threshold versus temperature 60 80 100 120 c) mv undershoot ?i / ?t=2a/us
? 2015 exar corporation fig. 10:powerup, iout=3 a, 1.5vin, 1vout fig. 12: enable turn on/off, 3a, 1.5vin, 1vout fig. 14: current limit, 1.5vin, 1vout vin, 1v/div vout, 0.5v/div pgood, 1v/div iout, 2a/div 4ms/div vout, 0.5v/div iout, 2a/div pgood, 1v/div en, 2v/div 2ms/div vout, 0.5v/div vin, 1v/div iout, 2a/div 2ms/div 3a ultra low dropout voltage regulator 6/11 a, 1.5vin, 1vout fig. 11 : powerdown, iout=3a, 1.5vin, 1vout enable turn on/off, 3a, 1.5vin, 1vout fig. 13 : psrr, 50ma, 1.5vin, 1vout, 47uf cout 1.5vin, 1vout 2ms/div iout, 2a/div pgood, 1v/div vout, 0.5v/div vin, 1v/div cout=47uf dotted =100mvp non- dotted=200mvp ripple rejection (db) xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 : powerdown, iout=3a, 1.5vin, 1vout : psrr, 50ma, 1.5vin, 1vout, 47uf cout 2ms/div =100mvp -p ripple dotted=200mvp -p ripple
? 2015 exar corporation theory of operation s ingle r ail i nput v oltage the xrp6275s ult ra low input voltage allow single rail operation from 2.62 5v down 1.045v without requiring any extra biasing voltage. this single input voltage range provides easy conversions from industry standard 1.1v, 1.2v, 1.35v, 1.5v, 1.8v and 2.5v power rails. d ropout v oltage the dropout voltage is the input differential voltage at which the ceases to regulate against further reductions in input voltage; this point occurs when the input voltage approaches the output voltage. the xrp6275 provides ultra low leading dropout voltage performance making it the perfect solution for high current extremely tight input/output voltage conversions. t extremely low dropout voltage allows high efficiencies conversions. below tables illustrate the achievable conversions for different load requirements the xrp6275. 3a vin (v) 1.80 1.50 1.35 1.20 1.10 1.00 0.90 2.50 yes yes yes yes yes yes yes 1.80 yes yes yes yes yes yes 1.50 no yes yes yes yes 1.35 no yes yes yes 1.20 no yes yes 1.10 no yes 2a vin (v) 1.80 1.50 1.35 1.20 1.10 1.00 0.90 2.50 yes yes yes yes yes yes yes 1.80 yes yes yes yes yes yes 1.50 yes yes yes yes yes 1.35 yes yes yes yes 1.20 no yes yes 1.10 no yes 1a vin (v) 1.80 1.50 1.35 1.20 1.10 1.00 0.90 2.50 yes yes yes yes yes yes yes 1.80 yes yes yes yes yes yes 1.50 yes yes yes yes yes 1.35 yes yes yes yes 1.20 yes yes yes 1.10 yes yes output voltage output voltage output voltage note: yellow indicates conversions that may be thermally limited the maximum output current available for a given conversion is dependent o operating conditions and thermal performance of dfn10/pcb (see note 1 on page 3) 3a ultra low dropout voltage regulator 7/11 ra low input voltage allow s 5v down to 1.045v without requiring any extra biasing voltage. this single input voltage range easy conversions from industry standard 1.1v, 1.2v, 1.35v, 1.5v, 1.8v and the dropout voltage is the input -to-output differential voltage at which the xr6275 ceases to regulate against further reductions voltage; this point occurs when the input voltage approaches the output voltage. ultra low industry leading dropout voltage performance making it the perfect solution for high current extremely tight input/output voltage conversions. t his extremely low dropout voltage allows high below tables illustrate the achievable conversions for different load requirements for 0.90 0.80 0.60 yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes 0.90 0.80 0.60 yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes 0.90 0.80 0.60 yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes conversions that may be thermally the maximum output current available for a given conversion is dependent o n the and thermal performance (see note 1 on page 3) . s etting t he o utput v oltage the xrp6275 is an adjus table regulator that can be programmed to any value between 0.6v and 2.4 v using 2 external resistors, r1 and r2. the relationship between the resistors and the output voltage is: 0. 6 where v out is the desired output voltage. sum of resistors r1 and r2 must meet the following requirement: 1 2 20 i nput and o utput c apacitors the xrp6275 is designed to be stable for all available types and values of output capacitors greater than 4.7f. the required capacitance on pins strongly depends on the input supply source impedance; the minimum recommended capacitor for vin is 4.7f. low esr ceramic x5r and x7r capacitors are recommended and should be placed as close as possible to the pins for optimal performance. because of the low voltages and high currents supported by this device, typical values of 47uf for both input and output capacitors are recommended when powering high speed digital circuits. e nable i nput and s hutdown the enable pin (en) can be used the xrp6275 . connecting this pin to ground signal or to a voltage less than typical will completely turn off the regulator. the en above 0.67v enables the xrp6275. where en is derived from vin it must be sequenced with respect t o vin as shown in the application circuit. where an independent control signal is applied to en, it must be asserted high after vin reaches its minimum operating range. the enable pin is a high impedance mos input. in order to allow the en pin compatibili 5v or 3.3v control signals, there is an internal xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 oltage table regulator that can be programmed to any value between v using 2 external resistors, r1 and r2. the relationship between the resistors 6 1 is the desired output voltage. sum of resistors r1 and r2 must meet the 20 apacitors designed to be stable for all available types and values of output capacitors the required capacitance on the v in and v out pins strongly depends on the input supply source impedance; the minimum recommended capacitor for vin is 4.7f. low esr ceramic x5r and x7r capacitors are recommended and should be placed as close as possible to the pins for optimal because of the low voltages and high currents supported by this device, typical values of 47uf for both input and output capacitors are recommended when powering high speed hutdown the enable pin (en) can be used to shut down . connecting this pin to ground signal or to a voltage less than typical 0.55v will completely turn off the regulator. pulling the en above 0.67v enables the xrp6275. where en is derived from vin it must be o vin as shown in the application circuit. where an independent control signal is applied to en, it must be asserted high after vin reaches its minimum is a high impedance mos input. in order to allow the en pin compatibili ty with 5v or 3.3v control signals, there is an internal
? 2015 exar corporation clamp set to vin+0.5v. when using the en pin with a control signal greater than vin+0.5v, a resistor must be placed in series with the en pin to limit the input current 100ua. the resistor mu st also be low enough to ensure at least 15ua can be sourced to enable the part. the precision feature enables simple sequencing of multiple power supplies with a resistor divider from another power supply power good flag. the en pin can also be used a s an external uvlo to disable the part when input voltage falls below a lower boundary of operation. s oft s tart the xrp6275 features a soft - controls the output voltage ramp the regulator to gradually reach the initial steady state operating point . this reduces current spikes and surges at star output capacitor inrush current. sequencing completes in 50us, and then reference voltage is linearly ramped period of approximately 2ms. the inrush current wi ll be the lesser of the current limit value or the current defined by the equation below: 2000 p ower g ood f lag the xrp6275 features a power good flag output signaling an abnormal operating condition. a low voltage on the power good flag output indicates: - output voltage v out is approximately 9 % below its expected value - a thermal fault has occurred the power good flag output, is an open collector capable of sinking in excess of 1ma. 3a ultra low dropout voltage regulator 8/11 clamp set to vin+0.5v. when using the en control signal greater than vin+0.5v, a resistor must be placed in series with the en pin to limit the input current below st also be low enough to ensure at least 15ua can be sourced to the precision feature enables simple sequencing of multiple power supplies with a resistor divider from another power supply or the en pin can also be used s an external uvlo to disable the part when input voltage falls below a lower boundary of - start which controls the output voltage ramp and allows the regulator to gradually reach the initial . this reduces at star t up due to current. internal and then the is linearly ramped over a ll be the lesser of the current limit value or the current defined by a power good flag output signaling an abnormal operating condition. a low voltage on the power good approximately % below its expected value a thermal fault has occurred the power good flag output, is an open collector capable of sinking in excess of 1ma. o utput current limit protection the xrp6275 integrates output current protection in order to protect the system main power supply, the regulator from excessive current flow. this cur effectively keeps the flow of current in the circuit at a safe level. in short circuit conditions, the device will take additional steps to limit input and power by disabling and re- enabling the pass device until the short condition is removed a operation can resume. depending on the impedance of the short, this short circuit protection function may initiate operation between 10% and 50% of the targeted output voltage t hermal p rotection and the xrp6275 includes a thermal circuitry in order to restrict the devices operating temperature within a safe operating range. when activated, typically at 1 xrp6275 is forced into a low power reset state with a typical hysteresis of combined with the shor protection, it reduces and lim effects of over- temperature and/or over current conditions on the ldo and surrounding circuits. r everse b ias p rotection in addition to the standard protection features in these devices, they a reverse bias protection. most ldos have a parasitic body diode that provides a path from v out to v in if the input is the xrp6275 has a blocking diode to ensure that no high discharge currents can occur between the out put and the input when the input is shorted to ground. xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 protection output current limit protection in order to protect the system main regulator itself and the load from excessive current flow. this cur rent limit effectively keeps the flow of current in the in short circuit conditions, the device will take additional steps to limit input and power by enabling the pass device until the short condition is removed a nd normal operation can resume. depending on the impedance of the short, this short circuit protection function may initiate operation between 10% and 50% of the targeted output rotection and s hutdown a thermal shutdown circuitry in order to restrict the devices operating temperature within a safe operating range. when activated, typically at 1 60c, the forced into a low power reset state with a typical hysteresis of 30 degrees. combined with the shor t circuit current protection, it reduces and lim its the heating temperature and/or over - current conditions on the ldo and surrounding rotection in addition to the standard protection features in these devices, they a lso incorporate a reverse bias protection. most ldos have a parasitic body diode that provides a path from if the input is shorted to ground. a blocking diode to ensure that no high discharge currents can occur put and the input when the
? 2015 exar corporation t ypical a pplication c ircuit fig. 15 vin =1.2v-2.625v 47uf enable pgood 55k 3a ultra low dropout voltage regulator 9/11 15 : xrp6274/5 typical application diagram pgood en vin gnd vout adj xrp6274/5 dfn-10 20 ohm 30.1 ohm 100k 0.1uf xrp6275 dfn-10 xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 vout=1v 47uf
? 2015 exar corporation package specification 3a ultra low dropout voltage regulator 10/11 10-pin 3 xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 3 mm x 3mm dfn
? 2015 exar corporation revision history revision date 1.0.0 12/26/2013 initial release 1.0.1 01/07/2013 typographical and formatting changes 2.0.0 01/23/2015 added esd c for further assistance email: exar technical documentation: notice exar corporation reserves the right to make changes to the products contained in this publication in o rder to improve design, performance or reliability. exar corporatio n assumes no responsibility for the use of any circ uits described herein, conveys no li cense under any patent or other right, and makes no representation that the circuits are free of paten t infringement. charts and schedules contained users specific application. while the information in this publication has been carefu lly checked; no responsibility, however, is assumed for inaccuracies. exar corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly aff ect its safety or effectiveness. products are not authorize d for use in such applications unless exar corporat ion receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corpora tion is adequately protected under the circumstance s. reproduction, in part or whole, without the prior w ri 3a ultra low dropout voltage regulator 11/11 description initial release . [ecn: 1352-08] typographical and formatting changes . [ecn: 1402-xx] added esd c dm and jc specification, changed en description [ecn customersupport@exar.com powertechsupport@exar.com http://www.exar.com/techdoc/default.aspx? e xar c orporation h eadquarters and s ales 48720 kato road fremont, ca 94538 C usa tel.: +1 (510) 668-7000 fax: +1 (510) 668-7030 www.exar.com exar corporation reserves the right to make changes to the products contained in this publication in o rder to improve design, performance or reliability. exar corporatio n assumes no responsibility for the use of any circ uits described herein, cense under any patent or other right, and makes no representation that the circuits are free of paten t infringement. charts and schedules contained herein are only for illustration purposes and may vary dep ending upon a the information in this publication has been carefu lly checked; no responsibility, however, exar corporation does not recommend the use of any of its products in life support applications where the failure or product can reasonably be expected to cause failure of the life support system or to significantly aff ect its safety or effectiveness. products are not authorize d for use in such applications unless exar corporat ion receives, in satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corpora tion is adequately protected under the circumstance s. reproduction, in part or whole, without the prior w ri tten consent of exar corporation is prohibited. xrp6275 3a ultra low dropout voltage regulator rev. 2.0.0 [ecn 1504-10] powertechsupport@exar.com http://www.exar.com/techdoc/default.aspx? ales o ffices exar corporation reserves the right to make changes to the products contained in this publication in o rder to improve design, performance or reliability. exar corporatio n assumes no responsibility for the use of any circ uits described herein, cense under any patent or other right, and makes no representation that the circuits are free of paten t are only for illustration purposes and may vary dep ending upon a the information in this publication has been carefu lly checked; no responsibility, however, exar corporation does not recommend the use of any of its products in life support applications where the failure or product can reasonably be expected to cause failure of the life support system or to significantly aff ect its safety or effectiveness. products are not authorize d for use in such applications unless exar corporat ion receives, in satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of exar corpora tion is adequately protected under the circumstance s.
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