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key features applications low-dropout regulator supports input voltages down to 1.4v output voltage available in 0.9v, 1.0v, 1.2v, 1.5v,1.8v, 2.5v,2.8v,2.85v,3.0v,3.3v stable with a ceramic output capacitor of 1.0uf or higher low dropout voltage :50mv@ 0.5a low quiescent current over temperature shutdown low temperature coefficient dsp, fpga and microprocessor power supplies 1.2v core voltage for dsps lcd tv/ monitors wireless devices communication devices portable electronics post regulator for smps ceramic general description the PAM3105 is a 0.5a cmos ldo regulator that features a low quiescent current, ultra low input, output and dropout voltages, as well as over temperature shutdown. it is available in a sot-89 package. the fixed output voltage of the PAM3105 is set at the factory and trimmed to 2.0%. the device is stable with a output capacitor of 1.0uf or higher. this family of regulators can provide either a stand-alone power supply solution or act as a post regulator for switch mode power supplies. they are particularly well suited for applications requiring low input and output voltages. pb-free package typical application PAM3105 0.5a low voltage- low dropout cmos regulator 1 www.poweranalog.com block diagram thermal shutdown amp vin vout gnd r2 r1 08/2007 vin c 4.7uf in c 2.2uf o vout vin vout gnd PAM3105 , power analog microelectronics inc
2 pin configuration & marking information 12 3 p3105 v xat y w top view sot-89-3 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 output pin voltage....................-0.3v to v +0.3v operation temperature range........... operation junction temperature...... storage temperature..................... -65 to 150 maximum junction temperature..................150 soldering temperature.......................300 , 5sec in -40 to 85 -40 to 125 recommended operating conditions supply voltage range.......................1.4v to 3.6v operation temperature range...........-40 to 85 junction temperature range.......... -40 to 125 thermal information pin number name function 1 gnd ground 2 vin input 3 vout output v: voltage code y:year w: weekly x: internal code a: assembly code t: testing code 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc parameter symbol package maximum unit thermal resistance (junction to case) jc sot-89-3 50 thermal resistance (junction to ambient) ja sot-89-3 180 /w internal power dissipation p d sot-89-3 550 mw www.poweranalog.com
electrical characteristic v v c, c =4.7uf, c =2.2uf, unless otherwise noted. in o in o o a = +0.5v, t =25 3 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator parameters symbol test conditions min typ max units input voltage range v in note 1 3.6 v output voltage accuracy vo io=50ma -2 2 % vo=0.9v 330 450 vo=1.0v 220 350 2.5v>vo 1.2v 20 150 i o =100ma vo 2.5v 10 100 vo=0.9v 330 500 vo=1.0v 220 400 2.5v>vo 1.2v 50 200 dropout voltage v drop i o =500ma vo 2.5v 40 150 mv quiescent current i q io=0ma 90 150 ua ground pin current i gnd io=1ma to 500ma 95 300 ua 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 0.1 1 %/v load regulation ldr io=1ma to 500ma, v in =vo+0.5v 0.2 1.5 % over temperature shutdown ots 150 over temperature hysteresis oth 50 temperature coefficient tc 40 ppm/ f=100hz 65 f=1khz 60 power supply ripple rejection psrr io=100ma, vo=0.9v f=10khz 40 db output noise vn f=10hz to 100khz 40 uvrms note1: the minimum input voltage (v ) of the PAM3105 is determined by output voltage and dropout voltage. the minimum input voltage is defined as: v=v+v in(min) in(min) o drop , power analog microelectronics inc www.poweranalog.com
typical performance characteristics t =25 c, c =4.7uf, c =2.2uf, unless otherwise noted. ain o o 4 1. output voltage vs input voltage 2.1 2.3 2.5 2.7 2.9 3.1 3.3 3.5 2.2 2.5 2.8 3.1 3.4 3.7 4 input voltage(v) output voltage(v) io=500ma io=200ma io=1ma vo=3.3v 0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) output voltage(v) io=500ma io=200ma io=1ma vo=0.9v 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) output voltage(v) io=200ma io=1ma io=500ma vo=1.8v 2. output voltage vs output current vo=3.3v vo=0.9v vo=1.8v 0.85 0.875 0.9 0.925 0.95 0 100 200 300 400 500 output current(ma) output voltage(v) v in =1.4v v in =2.5v v in =3.6v 1.7 1.72 1.74 1.76 1.78 1.8 1.82 1.84 0 100 200 300 400 500 output current(ma) output voltage(v) v in =3v v in =2.2v v in =3.6v 3.25 3.27 3.29 3.31 3.33 3.35 0 100 200 300 400 500 output current(ma) output voltage(v) v in =3.6v v in =3.5v 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc www.poweranalog.com
5 3. output voltage vs temperature 0.86 0.87 0.88 0.89 0.9 0.91 0.92 25 50 75 100 125 temperature( ) output voltage(v) v in =2v,io=200ma v in =2v,io=10ma vo=0.9v 1.7 1.72 1.74 1.76 1.78 1.8 1.82 1.84 25 50 75 100 125 temperature( ) output voltage(v) v in =3v,io=10ma v in =3v,io=200ma vo=1.8v vo=3.3v 3.2 3.22 3.24 3.26 3.28 3.3 3.32 25 50 75 100 125 temperature( ) output voltage(v) v in =3.6v,io=10ma v in =3.6v,io=200ma 4. dropout voltage vs output current vo=0.9v vo=1.8v vo=3.3v 100 150 200 250 300 350 400 450 0 100 200 300 400 500 output current(ma) dropout voltage(mv) 0 10 20 30 40 50 60 70 0 100 200 300 400 500 output current(ma) dropout voltage(mv) 0 10 20 30 40 50 60 70 0 100 200 300 400 500 output current(ma) dropout voltage(mv) typical performance characteristics (continued) 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc www.poweranalog.com
6 5. dropout voltage vs temperature 0 10 20 30 40 50 60 70 25 50 75 100 125 temptrature( ) dropout voltage @ 500ma(mv) vo=1.8v vo=3.3v 6. quiescent current vs input voltage 0 20 40 60 80 100 120 140 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) quiescient current(ua) vo=0.9v vo=1.8v vo=3.3v 50 60 70 80 90 100 110 120 1.8 2.1 2.4 2.7 3 3.3 3.6 input voltage(v) quiescient current(ua) 40 60 80 100 120 140 160 180 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 input voltage(v) quiescent current(ua) io=0m a typical performance characteristics (continued) 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc www.poweranalog.com
7 7. ground current vs input voltage vo=0.9v vo=1.8v vo=3.3v vo=0.9v vo=1.8v vo=3.3v 20 40 60 80 100 120 140 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 input voltage(v) ground current(ua) io=1ma io=200ma io=500ma 50 60 70 80 90 100 110 120 1.8 2.1 2.4 2.7 3 3.3 3.6 input voltage(v) ground current(ua) io=1ma io=500ma io=200ma 50 100 150 200 250 300 350 3.2 3.3 3.4 3.5 3.6 input voltage(v) ground current(ua) io=500ma io=200ma io=1ma 8. ground current vs output current 60 70 80 90 100 110 120 130 140 0 100 200 300 400 500 output current(ma) ground current(ua) v in =3.3v v in =2.5v v in =3.6v 50 60 70 80 90 100 110 120 0 100 200 300 400 500 output current(ma) ground current(ua) v in =2.2v v in =3.6v v in =3v 80 90 100 110 120 130 140 150 0 100 200 300 400 500 output current(ma) ground current(ua) v in =3.5v v in =3.6v typical performance characteristics (continued) 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc www.poweranalog.com
8 10. line transient response v in =2.2v to 3.6v,vo=1.8v,i =1ma o vin dc coupling vo ac coupling io=1ma to 500ma,vo=1.8v,v =3.3v in 9. load transient response io dc coupling vo ac coupling io dc coupling vo ac coupling io=1ma to 100ma,vo=1.8v, =3.3v v in io dc coupling vo ac coupling io=100ma to 500ma,vo=1.8v, =3.3v v in audio precision 11. power supply ripple rejection -8 0 +0 -7 0 -6 0 -5 0 -4 0 -3 0 -2 0 -1 0 d b 10 100 k 20 50 100 200 500 1k 2k 5k 10 k 20 k 50 k hz io=1ma io=100ma io=500ma typical performance characteristics (continued) 08/2007 vo=0.9v PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc www.poweranalog.com
the PAM3105 family of low-dropout (ldo) regulators have several features that allow them to apply to a wide range of applications. the family operates with very low input voltage (1.4v) and low dropout voltage (typically 50mv at full load), making it an efficient stand-alone power supply or post regulator for battery or switch mode power supplies. the 0.5a output current makes the PAM3105 family suitable for powering many microprocessors. the PAM3105 family also has low output noise (typically 40vrms with 2.2f output capacitor), making it ideal for use in telecom equipment. a 2.2f or larger ceramic input bypass capacitor, connected between vin and gnd and located close to the PAM3105, is required for stability. a 1.0uf minimum value capacitor from vout to gnd is also required. to improve transient response, noise rejection, and ripple rejection, an additional 10f or larger,low esr capacitor is recommended at the output. a higher value, low esr output capacitor may be necessary if large, fast-rise-time load transients are anticipated and the device is located several inches from the power source, especially if the minimum input voltage of 1.4 v is used. the PAM3105 features internal current limiting and thermal protection. during normal operation, the PAM3105 limits output current to approximately 1a. when current limiting engages, the output voltage scales back linearly until the over current condition ends. while current limiting is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package. if the temperature of the device exceeds 150c, thermal-protection circuitry will shut it down. once the device has cooled down to approximately 50c below the high temp trip point, regulator operation resumes. the amount of heat that an ldo linear regulator generates is: power=(v -v )i . all integrated circuits have a maximum allowable junction temperature (t max) above which normal operation is not assured. a system designer must design the operating environment so that the operating junction temperature (t ) does not exceed the maximum junction temperature (t max). the two main environmental variables that a designer can use to improve thermal performance are air flow and external heatsinks. the purpose of this information is to aid the designer in determining the proper operating environment for a linear regulator that is operating at a specific power level. in general, the maximum expected power (p (max)) consumed by a linear regulator is computed as: (1) where: v is the average input voltage. v is the average output voltage. i is the average output current. i is the quiescent current. for most ldo regulators, the quiescent current is insignificant compared to the average output current; therefore, the term v xi can be neglected. the operating junction temperature is computed by adding the ambient temperature (t ) and the increase in temperature due to the regulator' s power dissipation. the temperature rise is computed by multiplying the maximum expected power dissipation by the sum of the thermal resistances between the junction and the case r ), the case to heatsink (r ), and the heatsink to ambient (r ). thermal resistances are measures of how effectively an object dissipates heat. typically, the larger the device, the more surface area available for power dissipation so that the object 's thermal resistance will be lower. external capacitor requirements regulator protection thermal information in o o j j j d i (avg) o(avg) o(avg) (q) i(avg) (q) a jc cs sa ( ? application information 9 08/2007 dmax i avg o avg o avg i avg q p=v-v i +vi PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc www.poweranalog.com
ordering information PAM3105 xxxx output voltage number of pins package type pin configuration please consult pam sales office or authorized rep distributor for output voltage and package type availability ./ . 10 pin configuration package type number of pins output voltage atype 1. gnd 2. vin 3. vout c sot-89 a: 3 090: 0.9v 100: 1.0v 120: 1.2v 150: 1.5v 180: 1.8v 250: 2.5v 280: 2.8v 285:2.85v 300: 3.0v 330: 3.3v 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc www.poweranalog.com
ordering information 11 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator part number output voltage marking package type standard package PAM3105aca090 0.9v p3105z xatyw sot-89-3 1,000units/tape &reel PAM3105aca100 1.0v p3105y xatyw sot-89-3 1,000units/tape &reel PAM3105aca120 1.2v p3105b xatyw sot-89-3 1,000units/tape &reel PAM3105aca150 1.5v p3105c xatyw sot-89-3 1,000units/tape &reel PAM3105aca180 1.8v p3105e xatyw sot-89-3 1,000units/tape &reel PAM3105aca250 2.5v p3105g xatyw sot-89-3 1,000units/tape &reel PAM3105aca280 2.8v p3105h xatyw sot-89-3 1,000units/tape &reel PAM3105aca285 2.85v p3105i xatyw sot-89-3 1,000units/tape &reel PAM3105aca300 3.0v p3105j xatyw sot-89-3 1,000units/tape &reel PAM3105aca330 3.3v p3105k xatyw sot-89-3 1,000units/tape &reel please consult pam sales office or authorized rep distributor for output voltage and package type availability ./ . , power analog microelectronics inc www.poweranalog.com
outline dimension 12 a a section - a a section - (:) unit mm (:) unit mm sot 89 3 -- sot 89 3 -- 45 005 .. 45 005 . . 1 400 ref . 1 400 ref . 150 005 .. 150 005 . . 6? 038 001 .. 038 001 . . 420 005 .. 420 005 . . 25 005 .. 25 005 . . 100 007 .. 100 007 . . 150 . 150 . 150 . 150 . 3 00 0 025 .. 3 00 0 025 . . 0 46 0 025 .. 0 46 0 025 . . 6?-2x 6?-2x 1 650 ref . 1 650 ref . a do po p2 p1 d1 b b e f w ao 8max ' 8max ' ko 12 max ' 12 max ' bo b b section - b b section - t a symbol ao bo ko po p1 p2 t spec 4.850.1 4.450.1 1.850.1 4.00.1 8.00.10 2.00.05 0.2540.02 symbol e f do d1 w 10po spec 1.750.1 5.50.05 1.500.10 1.50.25 12.0+0.3 -0.1 40.00.2 08/2007 PAM3105 0.5a low voltage- low dropout cmos regulator , power analog microelectronics inc www.poweranalog.com

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