advanced power technology licensed from international rectifier electronics corp. 300ma ultra low dropout positive a djustable and fixed regulators features description stable with 2.2uf ceramic capacitor 2% voltage reference accuracy only 270mv dropout at 300ma and 170mv dropout at 150ma 5ua quiescent current in shutdown current limit and thermal shutdown logic input enable pin rohs compliant & halogen-free sot-23-5l & sot-23-5lr package applications laptop, notebook & palmtop computers battery powered equipments pcmcia vcc & vpp regulator consumer electronics high efficiency linear power supplies data and specifications subject to change without notice 20140331v8.1 apu1205 typical application package / ordering information 1 the apu1205 device is an efficient linear voltage regulator with better than 2% initial voltage accuracy, very low dropout voltage and very low ground current designed especially for hand held, battery powered applications. other features of the device are: ttl compatible enable/shutdown control input, current limiting and thermal shutdown. the apu1205 is available in fixed and adjustable output voltage versions in a small sot-23 5-pin package. figure 1 - typical application of the apu1205 adjustable voltage regulator. figure 2 - typical application of the apu1205-25 fixed voltage regulator. vin gnd en vout adj enable vin vout vo= 1.25 x (1+r1/r2) c2 2.2uf c1 2.2uf r1 r2 + + vin gnd en vout cbyp enable vin=3.3v vout=2.5v c2 2.2uf c1 2.2uf + + + c3 1000pf adj fixed adj fixed vin gnd en adj vout top view sot-23-5l 1 2 3 45 en gnd vin vout cbyp top view sot-23-5l 1 2 3 45 en gnd vin vout adj top view sot-23-5lr 1 2 3 45 vin gnd en cbyp vout top view sot-23-5lr 1 2 3 45 apu1205x-xx y5 : sot-23-5l y5r : sot-23 -5lr package output voltage blank : adj 18 : 1.8v 25 : 2.5v 33 : 3.3v .
advanced power electronics corp. apu1205 absolute maximum ratings (t a =25 o c, unless otherwise specified.) input voltage (v in ) ---------------------------------------- - 10v enable input voltage (v en ) ----------------------------- - 10v storage temperature range (t st ) ------------------- - -65 to 150 o c operating junction temperature range (t j ) ------ - 0 to 150 o c thermal resistance junction to ambient (r thja ) 256 o c/w electrical specifications v in =v o + 1v(for fixed voltage devices), v out =v fb (for adjustable version only), c byp =470pf (for fixed voltage devices), v en =2v and t a =25 o c. typical values refer to t a =25 o c. low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. parameter sym test condition min typ max units reference voltage (see table 1 for t yp ical values ) vo -2 - 2 % line regulation ? v i v o + 1v advanced power electronics corp. apu1205 pin descriptions pin symbol pin description the input pin of the regulator. typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum drop out voltage during the load transient response. this pin must always be higher than vout by at least the amount of the dropout voltage and some margin in order for the device to regulate properly. ground pin. this pin must be connected to the lowest potential in the system and all other pins must be at higher potential with respect to this pin. enable pin. a low signal or left open on this pin shuts down the output. this pin must be tied hi or to vin for normal operation. a resistor divider from this pin to the vout pin and ground sets the output voltage. to minimize the error due to the error amplifier, select the values of the resistor dividers to be less than 10k . c byp (fixed only) a 470 to 1000pf bypass capacitor connected to this pin reduces the output noise. the output of the regulator. a minimum of 2.2uf with max esr of 1 capacitor must be connected from this pin to ground to insure stability. table 1- nominal output voltage vs. part number. block diagram 3 en vout vin gnd adj (adjustable only) part number output voltage apu1205 1.25v apu1205-18 1.8v apu1205-25 2.5v apu1205-33 3.3v the output voltage of the adjustable device can be set using: v o = 1.25 x (1+r1/r2) where: r1 = resistor connected from output to the adj pin r2 = resistor connected from adj pin to gnd + - thermal shutdown + 1 4 2 5 3 vin adj gnd vout en figure 3 - apu1205y5 adjustable output block diagram. .
advanced power electronics corp. apu1205 block diagram 4 + - thermal shutdown + 1 4 2 5 3 vin cbyp gnd vout en figure 4 - apu1205-18, apu1205-25 and apu1205-33 fixed output block diagram. .
advanced power electronics corp. apu1205 marking information sot-23-5l sot-23-5lr 5 rb&ss part number : rb date code ss:2004,2008,2012? ss :2003,2007,2011? s s:2002,2006,2010? ss :2001,2005,2009? output voltage : output voltage v out code adj blank 1.8v a 2.5v b 3.3v e rb&ss part number : rb date code ss:2004,2008,2012? ss :2003,2007,2011? s s:2002,2006,2010? ss :2001,2005,2009? output voltage : output voltage v out code adj blank 1.8v a 2.5v b 3.3v e .
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