advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 advanced ams5105 monolithic 500ma cmos low dropout voltage regulator systems rohs compliant features applications ? fixed and adjustable versions available ? cellular telephones ? output current up to 500ma ? portable consumer equipment ? very low quiescent current ? portable (notebook) computers ? input-output differential less than 0.5v ? battery powered systems ? short circuit protection ? portable instrumentation ? internal thermal overload protection ? radio control systems ? enable pin available in selected packages ? cd/dvd drives general description the ams5105 series consists of positive fixed and adjustable voltage regulators ideally suited for use in battery-powered systems. these devices feature very low qu iescent current (500ua or less) when supplying loads up to 500ma, and a standby current less than 500na when disabled using the enable pin (a vailable in selected packages). these unique characteristics and the low input-output differential required for proper regulation (0.5v for output currents of 500ma) make the ams5105 ideal for use in standby power systems. internal current limiting and thermal shutdown features provide protection for all ams5105 series devices regardless of package type. the ams5105 is offered as fixed voltage regulators in the 5 lead sot-23, sot-89, sot-223, and 8 lead soic packages, and as adjustable voltage regulators in the 5 lead sot-23 and 8 lead soic packages. all devices in the 5 lead sot-23 and 8 lead soic packages are provided with enable pin. ordering information output package type temp. voltage 5l sot-23 sot-89 sot-223 so-8 range fixed ams5105m1-x ams5105l-x AMS5105-X ams5105s-x -25c to 125c adjustable ams5105m1 ams5105s -25c to 125c x = 1.5v, 1.8v, 2.5v, 2.8v, 3.3v. pin connections 5 lead sot-23 (m1) sot-89 (l) sot-223 8 lead soic (s) v in v out enable fb n/c ground 1 2 5 3 4 123 gnd v out v in 123 gnd v out v in enable n/c v out fb n/c v in ground ground ground ground 1 2 8 4 3 7 5 6 top view top view top view top view
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams5105 absolute maximum ratings (note 1) input supply voltage -0.3 to +6.5v maximum junction temperature +125 c internal power dissipation (note 4) internally limited storage temperature -65 c to +150 c esd 2000v lead temperature (soldering 25 sec) 265 c electrical characteristics electrical characteristics at v in =v out +1v, i out =1ma, t j =25c, c out = 2.2 f unless otherwise specified. parameter conditions AMS5105-X min. typ. max. units fixed output voltage versions output voltage tolera nce -1.5 +1.5 % (v out +1v) v in 6v, i out =100 ma -25 c t j 125 c - 3.0 + 3.0 % line regulation (v in +1v) v in 6v 5 8 10 30 mv/v mv/v load regulation 1ma i out 100 ma 5ma i out 500 ma 30 50 50 70 mv mv dropout voltage i out = 10 ma i out = 100 ma i out = 500 ma 20 100 400 25 125 500 mv mv mv quiescent current i out = 10 ma i out = 100 ma i out = 500 ma r l = 500 ?, in disabled state, v enable = 0 450 450 450 100 550 550 550 500 a a a na maximum operational input voltage 6 v enable threshold voltage enabled disabled v in = 3v to 6v (note 6) 60 - - 15 % v in % v in enable threshold current v enable = 0.6 x v in , v in = 3v to 6v 0.01 1 na wake-up response time (from disabled state) (note 7) - 20 30 s
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams5105 electrical characteristics electrical characteristics at v in =6v, v out =3v, i out =1ma, t j =25c, c out = 2.2 f unless otherwise specified. parameter conditions (note 2) min. ams5105 typ. max. units adjustable version reference voltage 1.231 1.250 1.269 v i out 100 ma, -25 c t j 125 c measured from fb pin to ground 1.218 1.250 1.282 v output voltage range 1.25 - 5 v line regulation v out + 1v v in 6v - 1.5 % load regulation 1ma i o 100 ma 5ma i o 500 ma 0.3 1 1 2 % % dropout voltage i out 10 ma i out = 100 ma i out = 500 ma (note 5) 20 100 400 25 125 500 mv mv mv quiescent current i out = 10 ma i out = 100 ma i out = 500 ma r l = 500 ?, in disabled state, v enable = 0 350 350 350 100 450 450 450 500 a a a na maximum operational input voltage 6 v enable threshold voltage enabled disabled v in = 3v to 6v (note 6) 60 - - - - 15 % v in % v in enable threshold current v enable = 0.6 x v in , v in = 3v to 6v 0.01 1 na wake-up response time (from disabled state) (note 7) - 20 30 s note 1: absolute maximum ratings are limits beyond which damage to the device may occur. for guaranteed performance limits and associat ed test conditions, see the electrical characteristics tables. note 2: to ensure constant junction temperature, low duty cycle pulse testing is used. note 3: limits appearing in boldface type apply over the entire junction temperature range for operation. limits appearing in normal type apply for t a = t j = 25 c. note 4: the maximum allowable power dissipation is a f unction of the maximum junction temperature t j (max), the junction-to ambient thermal resistance j-a and the ambient temperature ta. the maximum allowable power di ssipation at any ambient temperature is calculated using: a - j a j t - (max) t p(max) = where the values of the junction-to-ambie nt thermal resistances are as follows: 220 c/w for 5 lead sot-23 (m1) and 160 c/w for the molded plastic so-8 (s). note 5: dropout voltage is defined as the input to output differential at which the output voltage drops 100mv below its nominal value measured at 1v differential. note 6: enable threshold voltage levels are specified as a percentage of input voltage v in . quiescent current can be minimized by choosing v enable high equal to v in . note 7: time required for v out to reach 95% of output voltage setting after v enable is switched from 0v to v in .
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams5105 typical performance characteristics
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams5105 ams5105/-x pin description 5-lead sot-23 pin name description 1 v in unregulated input voltage connect c in from v in to gnd 2 gnd ground connection for v in and v out 3 enable logical high enables regulator logical low disables regulator 4 fb feedback from resistor divider used to set output voltage adjustable versions only (see figures 3 and 4) 5 v out regulated output voltage connect c out from v out to gnd
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams5105 application notes definition of terms dropout voltage : the input-output voltage differential at which the circuit stops to regulate against further reduction in input voltage. measured when the output voltage has dropped 100mv from the nominal voltage obtained at 1v input, dropout voltage is dependent upon load current and junction temperature. input voltage : the dc voltage applied to the input terminal with respect to ground. input-output differential : the voltage difference between the unregulated input voltage and the regulated output voltage for which the regulator will regulate. line regulation : the change in output voltage for a change in the input voltage. the line regula tion is measured under conditions of low dissipation or by using lo w duty cycle pulse testing such that the average chip temperature is not significantly affected. load regulation : the change in output voltage for a change in load current at constant chip temperature. long term stability : output voltage stab ility under ac celerated life-test conditions after 1000 hour s with maximum rated voltage and junction temperature. quiescent current : that part of the positive input current that does not contribute to the positive load current. the regulator ground lead current. temperature stability of v o : the percentage change in output voltage for a thermal variation from room temperature to either temperature extreme. external capacitor the ams5105 series requires an output capacitor of 2.2 f or greater to ensure device stability, as shown in figures 1 through 4. without the capacitor the device ma y oscillate. most types of tantalum or electrolytic capacitor can be used in the applications. the value of this capacitor can be increased without limits. for higher loads, the value of the capacitor should be increased, especially when the output voltage is set for 2.5v or less. the ams5105 lowest fixed output voltage value is 1.5v. programming the output voltage the ams5105 may be programmed for any output voltage between its 1.25v reference and its 6v maximum rating, allowing for dropout and power dissipation. as shown in figure 3, an external pair of resistors is required. the equation for the output voltage is: v out = v ref ? (1 + r 1 / r 2 ) where v ref is the nominal 1.25 reference voltage. typical application circu it (adjustable output) typical application gnd enable 2 3 1 5 + 2.2 f + c in +v in v out AMS5105-X 2.2 f c out +v in v out figure 2 gnd v out 2 3 1 +v in +v in v out AMS5105-X + 2.2 f + c in 2.2 f c out figure 1 r 1 gnd fb v out v ref r 2 enable 4 2 3 1 5 +v in + ams5105 2.2 f + c in 2.2 f c out +v in v out 1.25v figure 3
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams5105 package dimensions inches (millimeters) unless otherwise noted. 5 lead sot-23 plastic package (m1) sot-89 plastic package (l) 0.059-0.070 (1.50-1.75) 0.014-0.020 (0.350-0.50) 0.110-0.120 (2.794-3.048) 0.102-0.118 (2.60-3.00) 0.037 (0.95) typ 0.075 (1.90) typ 0.018-0.024 (0.457-0.610) 10 nom 0.0035-0.0080 (0.090-0.20) (sot-23-5 ) ams drw# 051001 0.036-0.051 (0.090-1.30) 0.003 (0.150) max 0.018-0.024 (0.457-0.610) 10 nom 0.090-0.102 (2.29-2.60) 0.173-0.181 (4.40-4.60) 0.064-0.072 (1.62-1.83) 0.155-0.167 (3.94-4.25) 0.059 (1.50) bsc 0.035-0.047 (0.89-1.20) l (sot-89 ) ams drw# 042392 0.118 (3.00) bsc 0.014-0.019 (0.36-0.48) 0.017-0.022 (0.44-0.56) 0.084-0.090 (2.13-2.29) 0.055-0.063 (1.40-1.60) 0.014-0.017 (0.35-0.44)
advanced monolithic systems, inc. www.advanced-monolithic.com phone (925) 443-0722 fax (925) 443-0723 ams5105 3 lead sot-223 plastic package 8 lead soic plastic package (s) 0-8 typ 0.010-0.020 (0.254-0.508) s (so-8 ) ams drw# 042293 x 45 0.016-0.050 (0.406-1.270) 0.008-0.010 (0.203-0.254) 0.004-0.010 (0.101-0.254) 0.014-0.019 (0.355-0.483) 0.053-0.069 (1.346-1.752) 0.050 (1.270) typ 0.150-0.157** (3.810-3.988) 0.228-0.244 (5.791-6.197) 0.189-0.197* (4.801-5.004) *dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side **dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side 12 34 87 65
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