APU8831 200712251 data and specifications subject to change without notice. description the APU8831 device is an efficient linear voltage regula- tor 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 shut- down. the APU8831 is available in fixed and adjustable output voltage versions in a small sot-23 5-pin package. 300ma ultra low dropout regulators 5-pin sot-23 package stable with 2.2 m f ceramic capacitor 2% voltage reference accuracy only 270mv dropout at 300ma and 170mv dropout at 150ma 5 m a quiescent current in shutdown current limit and thermal shutdown logic input enable pin rohs compliant typical application figure 1 - typical application of the APU8831 ajustable voltage regulator. technology licensed from international rectifier applications laptop, notebook & palmtop computers battery powered equipments pcmcia vcc & vpp regulator consumer electronics high efficiency linear power supplies features package order information tj (c) 5-pin output sot-23 voltage 0 to 125 APU8831 y5 adj v in v out r1 r2 c1 2.2uf c2 2.2uf sd enable 4 1 5 v out adj 2 3 v in gnd en vo = 1.253 1+ r1 r2 ( ) 1
2 APU8831 absolute maximum ratings input voltage (v in ) ..................................................... 10v enable input voltage ................................................. 10v storage temperature range ....................................... -65c to 150c operating junction temperature range ...................... 0c to 150c package information 5-pin sot-23 (y5) electrical specifications reference voltage (see table 1 for typical values) line regulation load regulation (note 1) dropout voltage (note 2) ground current (note 3) ground current-sd activated current limit thermal regulation adjust pin current enable pin input lo voltage enable pin input hi voltage enable pin input lo current enable pin input hi current u ja =256 8 c/w unless otherwise specified, these specifications apply over cin=co=22mf, io=100ma, vin(min)=2.5v(adjustable devices) vin=vo + 1v(for fixed voltage devices), vout=vfb(for adjustable version only), cbyp=470pf(for fixed voltage devices), venb=2v and ta=258c. typical values refer to ta=258c. low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. vin vout gnd en adj 3 2 1 4 5 parameter sym test condition min typ max units vo + 1v APU8831 3 pin # 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 v out 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 v in for normal operation. a resistor divider from this pin to the v out 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 v . the output of the regulator. a minimum of 2.2mf with max esr of 1v capacitor must be connected from this pin to ground to insure stability. 5-pin output sot-23 voltage APU8831 1.25v note 3: ground current is the regulator quiescent cur- rent plus the pass transistor current. the total current from the supply is the sum of the load current plus the ground pin current. note 1: low duty cycle pulse testing with kelvin con- nections is required in order to maintain accurate data. note 2: dropout voltage is defined as the minimum dif- ferential voltage between v in and v out required to main- tain regulation at v out . it is measured when the output voltage drops 1% below its nominal value. pin descriptions the output voltage of the adjustable device can be set using: where: r1 = resistor connected from output to the adj pin r2 = resistor connected from adj pin to gnd 3 2 1 5 4 vin gnd en adj vout table 1- nominal output voltage vs. part number. vo = 1.25 3 1+ r1 r2 ( )
4 APU8831 block diagram figure 2 - APU8831 adjustable output block diagram. vin en thermal shutdown 1.25v vout adj gnd + 3 5 2 1 4
package outline : sot-23-5l millimeters min nom max a 1.00 1.10 1.30 a1 0.00 --- 0.10 a2 0.70 0.80 0.90 b 0.35 0.40 0.50 c 0.10 0.15 0.25 d 2.70 2.90 3.10 e 1.50 1.60 1.80 e --- 1.90(typ) --- h 2.60 2.80 3.00 l 0.37 --- --- 1159 e2 --- 0.95(typ) --- note 1 package body sizes exclude mold flash protrusions or gate burrs. note 2 tolerance 0.1000 mm(4mil) unless otherwise spe- cified. note 3 coplanarity 0.1000 mm note 4 dimension l is measured in gage plane. part marking information & packing : sot-23 -5l advanced power electronics corp. symbols rgxx part number : rg date code : xx 5
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