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key features description low-dropout regulator supports input the PAM3131 is a 3a cmos adjustable ldo voltages down to 1.4v regulator that features a low quiescent current, low dropout voltage: 300mv@ 3a ultra low input, output, and dropout voltages, as output voltage adjustable from 0.9v-3.3v well as over temperature protection. it is available stable with a ceramic output capacitor in to-263 and psop-8 (exposed pad) packages. of 1.0 f or higher the output voltage is adjustable from 0.9v to low quiescent current 3.3v. the PAM3131 is stable with a ceramic current limit output capacitor of 1.0 f or higher. over temperature shutdown short circuit current protection this family of regulators can provide either a low temperature coefficient stand-alone power supply solution or act as a post standard to-263 and psop-8 (exposed regulator for switch mode power supplies. they pad) packages are particularly well suited for applications requiring low input and output voltages. applications n dsp, fpga, and microprocessor power supplies n 1.2v core voltage for dsps n sata power supply n lcd tv/ monitors n wireless devices n communication devices n portable electronics n post regulator for smps n n n n n n n n n n n pb-free package typical application PAM3131 3a adjustable low voltage low dropout cmos regulator 1 www.poweranalog.com 10/2010 rev1.1 power analog microelectronics , inc vin c1 4.7 f c2 2.2 f vout vin vout gnd en adj PAM3131 pwrgd r 10k p r1 r2 vin c1 4.7 f c2 2.2 f vout vin vout gnd en adj PAM3131 r1 r2
2 block diagram power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator overcurrent shutdown thermal shutdown amp vin en vout gnd power monitor pwrgd adj reference 10/2010 rev1.1
3 top view to263-5l 1 2 3 4 5 p3131 xxxyw pin configuration & marking information 1 2 3 4 8 7 6 5 top view psop-8 (epd) p3131 xxxyw p3131: PAM3131 x: internal code y: year w: week power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1 pin number name function 1 vin input 2 en enable pin 3 gnd ground heatsink 4 adj adjustable pin 5 vout output pin number name function 1 gnd ground 2 vin input 3 en enable pin 4 gnd ground 5 pwrgd power good 6 adj adjustable pin 7 vout output 8 gnd ground p3131: PAM3131 x: internal code y: year w: week
4 absolute maximum ratings 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 . input voltage...............................................4.0v maximum output current......................p /(v -v ) d in o output pin voltage.....................-0.3v to v +0.3v storage temperature.................... -65 to 150 in operation temperature range......... maximum junction temperature..................150 operation junction temperature..... soldering temperature......................300 , 5sec c c -40c to 85c c -40c to 125c c recommended operating conditions supply voltage range.......................1.4v to 3.6v junction temperature range......... -40 to 125 operation temperature range.........-40 to 85 c c c c thermal information parameter symbol package maximum unit to-263 7 thermal resistance (junction to case) jc psop-8 10 to-263 35 thermal resistance (junction to ambient) ja psop-8 50 c/w to-263 2800 internal power dissipation (@ta=25 c ) p d psop-8 2000 mw power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
electrical characteristic o v v c, c =4.7 f, c =2.2 f, unless otherwise noted. in o a in o = +0.5v, t =25 5 note1: the minimum input voltage ( ) of the PAM3131 is determined by output voltage and dropout voltage. the minimum input voltage is defined as: v =v +v in(min) o drop note 2: output current is limited by p , maximum i =p /(v -v ). d o d in(max) o v in(min) parameters symbol test conditions min typ max units input voltage range v in note 1 3.6 v adj reference voltage vref io=100ma 0.882 0.9 0.918 v vo=0.9v 330 500 vo=1.0v 220 400 2.5v>vo 3 1.2v 50 200 i o =500ma vo 3 2.5v 40 150 vo=0.9v 500 vo=1.0v 400 2.5v>vo 3 1.2v 350 dropout voltage v drop i o =3.0a vo 3 2.5v 300 mv short circuit current i sc vo < 0.3v 1.0 a output current i o 3.0 note 2 a quiescent current i q io=0ma 90 150 a ground pin current i gnd io=1ma to 3.0a 1.0 ma vo 2.5v,io=10ma v in =vo+0.5v to vo+1.5v line regulation lnr vo>2.5v,io=10ma v in =3.3v to 3.6v 0.2 1.0 %/v load regulation ldr io=1ma to 3.0a,v in =vo+0.5v 0.5 2 %/a over temperature shutdown ots 150 c over temperature hysteresis oth 50 c temperature coefficient tc 40 ppm/c f=100hz 64 power supply ripple rejection psrr io=100ma, vo=1.5v f=1khz 58 db output noise vn f=10hz to 100khz 40 vrms power analog microelectronics inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
typical performance characteristics o t =25 c, c =4.7 f, c =2.2 f, unless otherwise noted. a in o 6 1. output voltage vs input voltage 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) output voltage(v) io=1.5a io=500ma io=10ma vo=0.9v 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) output voltage(v) i o =10ma,t a =25 io=10ma,t a =85 vo=0.9v 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) output voltage(v) io=1.5a io=500ma io=10ma vo=1.5v 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) output voltage(v) io=10ma,t a =25 io=10ma,t a =85 vo=1.5v 0.5 1 1.5 2 2.5 3 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) output voltage(v) io=1.5a io=500ma io=10ma vo=2.5v vo=2.5v 0.5 1 1.5 2 2.5 3 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) output voltage(v) io=10ma,t a =25 io=10ma,t a =85 power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
1.4 1.42 1.44 1.46 1.48 1.5 1.52 0 30 60 90 120 150 temperature( ) output voltage(v) io=10ma io=500ma typical performance characteristics (continued) 7 2. output voltage vs output current vo=0.9v 0.8 0.82 0.84 0.86 0.88 0.9 0.92 0.94 0.96 0 500 1000 1500 2000 2500 3000 output current(ma) output voltage(v) v in =1.5v v in =2.5v v in =3.3v 1.4 1.42 1.44 1.46 1.48 1.5 1.52 1.54 0 500 1000 1500 2000 2500 3000 output current(ma) output voltage(v) v in =2.0v v in =2.5v v in =3.3v vo=1.5v vo=1.5v 2.4 2.42 2.44 2.46 2.48 2.5 2.52 2.54 2.56 0 500 1000 1500 2000 2500 3000 output current(ma) output voltage v in =3.0v v in =3.3v v in =3.6v 3. output voltage vs temperature vo=0.9v,v =3.3v in 0.855 0.865 0.875 0.885 0.895 0.905 0.915 0 30 60 90 120 150 temperature( ) output voltage(v) io=10ma io=500ma vo=1.5v,v =3.3v in 2.3 2.35 2.4 2.45 2.5 2.55 0 30 60 90 120 150 temperature( ) voltage(v) io=10ma io=500ma vo=2.5v,v =3.3v in power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
typical performance characteristics (continued) 8 4. quiescent current vs input voltage 40 50 60 70 80 90 100 1.8 2.1 2.4 2.7 3 3.3 3.6 input voltage(v) quiescent current(ua) io=0ma,t a =85 io=0ma,t a =25 5. ground current vs input voltage 20 40 60 80 100 120 140 1.8 2.1 2.4 2.7 3 3.3 3.6 input voltage(v) ground current(ua) io=1.5a io=500ma io=10ma 6. ground current vs output current 0 50 100 150 200 250 300 350 0 500 1000 1500 2000 2500 3000 output current(ma) ground current(ua) v in =2v v in =2.5v v in =3.3v 7. ground current vs temperature 65 70 75 80 85 90 0 30 60 90 120 150 temperature( ) ground current(ua) v in =2.5v ,io=10ma v in =3.3v ,io=10ma 8. dropout voltage vs output current 0 50 100 150 200 250 300 350 400 450 0 500 1000 1500 2000 2500 3000 output voltage(ma) dropout voltage(mv) vo=0.9v vo=1.5v vo=2.5v 9. dropout voltage vs temperature 0 50 100 150 200 250 300 350 400 450 0 30 60 90 120 150 temperature( ) dropout voltage vo=0.9v,io=500ma vo=1.5v,io=500ma vo=2.5v,io=500ma power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
vo ac coupling io dc coupling typical performance characteristics (continued) 9 10. ripple rejection vs frequency vo=0.9v,v =2.5v,vpp=1v in audio precision 12/05/06 18:30:42 shanghai psrr-3 test.at1 color sweep trace line style thick data axis comment 1 1 green solid 1 anlr.crosstalk left io=1ma 2 1 yellow solid 1 anlr.crosstalk left io=100ma 3 1 red solid 1 anlr.crosstalk left -80 +0 -70 -60 -50 -40 -30 -20 -10 d b 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k hz io=500ma io=1ma io=100ma audio precision 12/05/06 18:24:51 shanghai psrr-3 test.at1 color sweep trace line style thick data axis comment 1 1 blue solid 1 anlr.crosstalk left io=1ma 2 1 cyan solid 1 anlr.crosstalk left io=100ma 3 1 green solid 1 anlr.crosstalk left io=500ma -80 +0 -70 -60 -50 -40 -30 -20 -10 d b 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k hz io=500ma io=1ma io=100ma vo=1.5v,v =2.5v,vpp=1v in audio precision 12/05/06 18:37:46 shanghai psrr-3 test.at1 color sweep trace line style thick data axis comment 1 1 magenta solid 1 anlr.crosstalk left io=1ma 2 1 blue solid 1 anlr.crosstalk left io=100ma 3 1 cyan solid 1 anlr.crosstalk left io=500ma -80 +0 -70 -60 -50 -40 -30 -20 -10 d b 10 100k 20 50 100 200 500 1k 2k 5k 10k 20k 50k hz io=500ma io=1ma io=100ma vo=2.5v,v =3.3v,vpp=0.3v in 11. load transient response vo=1.5v,v =3.3v, io=1ma to 1.0a in vo=1.5v,v =3.3v, io=1ma to 3.0a in vo ac coupling io dc coupling vo ac coupling io dc coupling vo=1.5v,v =3.3v, io=1a to 3.0a in power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
typical performance characteristics (continued) 10 12. line transient response vo=1.5v,io=100ma, v =2.0v to 3.3v in vo ac coupling v in dc coupling power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
application information 11 t h e pa m 3 1 3 1 f a m i l y o f l o w - d r o p o u t ( l d o ) increasing r1+r2 will reduce stability. in regulators have several features that allow them to general, r1 and r2 in the 10s of k will produce apply to a wide range of applications. the family adequate stability, given reasonable layout operates with very low input voltage (1.4v) and low p r e c a u t i o n s . t o i m p r o v e s t a b i l i t y dropout voltage (typically 300mv at full load), characteristics, keep parasitics on the adj pin making it an efficient stand-alone power supply or to a minimum, and lower r1 and r2 values. post regulator for battery or switch mode power supplies. the 3a output current make the PAM3131 thermal information family suitable for powering many microprocessors and fpga supplies. the PAM3131 family also has the amount of heat that an ldo linear regulator low output noise (typically 40vrms with 2.2f generates is: p =(v -v )i . d in o o output capacitor), making it ideal for use in telecom equipment. a l l i n t e g r a t e d c i r c u i t s h a v e a m a x i m u m allowable junction temperature (t max) above j external capacitor requirements which normal operation is not assured. a system d e s i g n e r m u s t d e s i g n t h e o p e r a t i n g a 2.2f or larger ceramic input bypass capacitor, environment so that the operating junction connected between v and gnd and located close in temperature (t ) does not exceed the maximum j to the PAM3131, is required for stability. a 1.0 f junction temperature (t max). the two main j minimum value capacitor from v to gnd is also o environmental variables that a designer can use required. to improve transient response, noise to improve thermal performance are air flow and rejection, and ripple rejection, an additional 10f e x t e r n a l h e a t s i n k s . t h e p u r p o s e o f t h i s or larger, low esr capacitor is recommended at the information is to aid the designer in determining output. a higher value, low esr output capacitor the proper operating environment for a linear may be necessary if large, fast-rise-time load regulator that is operating at a specific power transients are anticipated and the device is located level. several inches from the power source, especially if the minimum input voltage of 1.4v is used. in general, the maximum expected power (p (max)) consumed by a linear regulator is d regulator protection computed as: the PAM3131 features internal current limiting, ( 1) thermal protection and short circuit protection. where: during normal operation, the PAM3131 limits l v is the average input voltage. i (avg) output current to about 4.5a. when current limiting l v is the average output voltage. o(avg) engages, the output voltage scales back linearly l i is the average output current. o(avg) until the over current condition ends. while current l i is the quiescent current. (q) limiting is designed to prevent gross device failure, care should be taken not to exceed the power for most ldo regulators, the quiescent current d i s s i p a t i o n r a t i n g s o f t h e p a c k a g e . i f t h e is insignificant compared to the average output temperature of the device exceeds 150c, thermal- current; therefore, the term v xi can be i(avg) (q) protection circuitry will shut down. once the device neglected. the operating junction temperature has cooled down to approximately 50c below the is computed by adding the ambient temperature high temp trip point, regulator operation resumes. (t ) and the increase in temperature due to the a the short circuit current of the PAM3131 is about regulator' s power dissipation. the temperature 1a when its output pin is shorted to ground. rise is computed by multiplying the maximum expected power dissipation by the sum of the output adjustment thermal resistances between the junction and the case ( r ), the case to heatsink (r ), and jc cs the PAM3131 uses external feedback resistors to t h e h e a t s i n k t o a m b i e n t ( r ) . t h e r m a l generate an output voltage from 0.9v to 3.3v. v is s a adj resistances are measures of how effectively an trimmed to 0.9v and v is given by the equation: out object dissipates heat. typically, the larger the v = v ( 1 + r1 / r2 ) out adj device, the more surface area available for power dissipation so that the object 's thermal feedback resistors r1 and r2 should be high resistance will be lower. enough to keep quiescent current low, but ()() ( ) ()()() d i avg o avg o avg i avg q p max= v -v i +v i power analog microelectronics inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
ordering information PAM3131 x x x x number of pins package type pin configuration 12 pin configuration package type number of pins a type 1. vin 2. en 3. gnd 4. adj 5. vout b type 1. gnd 2. vin 3. en 4. gnd 5. pwrgd 6. adj 7. vout 8. gnd m: to-263 e: psop b: 5 c: 8 power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator packing part number package type standard package PAM3131ambr to263-5l 800 units/tape&reel PAM3131becr psop-8 2,500 units/tape&reel 10/2010 rev1.1
outline dimension to263-5l a c2 l4 l1 c e l2 l d e b dimensions(millimeter) symbol min nom max a 4.40 4.60 4.80 b 0.66 0.78 0.91 l4 0.00 0.15 0.30 c 0.36 0.43 0.50 l3 1.50 ref. l1 2.29 2.54 2.79 e 9.80 10.1 10.4 c2 1.25 1.35 1.45 l2 1.27 ref. d 8.6 8.8 9.0 e 1.70 ref. l 14.6 15.2 15.8 0o 4o 8o 13 power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1
outline dimension 14 psop-8 power analog microelectronics , inc www.poweranalog.com PAM3131 3a adjustable low voltage low dropout cmos regulator 10/2010 rev1.1

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