advanced power electronics corp. features description input voltage range : 2.6v~6.0v adjustable output voltage form 0.8v to 5.5v dropout voltage is 380mv at 1a output current guaranteed 1.2a output current low quiescent current is 50a (typ.) maximum supply current in shutdown mode <1ua fast transient response under-voltage protection current limit and thermal shutdown protection short circuit current fold-back available in the so-8 and esop-8 pb-free package ordering/package information data and specifications subject to change without notice 20090112pre APE8969 1.2a high output current ldo regulator typical application 1 preliminary the APE8969 is a low noise, high output current, low quiescent current and low dropout linear regulator. the device includes pass element, error amplifier, band-gap, current-limit and thermal shutdown circuitry. the output current is up to 1.2a, the characteristics of low dropout voltage and less quiescent current make it good for some critical current application, for example, some battery powered devices. the typical quiescent current is approximately 50a. in the shutdown mode, the maximum supply current is less than 1ua. built-in current-limit, short current protection and thermal-shutdown functions prevent any fault condition from ic damage. on off vin vout gnd in c v in out c APE8969 2.2uf 2.2uf out v en fb r1 r2 1 2 3 4 5,6,7,8 v out =v fb x ( 1+r1/r2), v fb =0.8v r2 ran g e = 50k~300k ( top view ) 1 2 3 4 8 7 6 5 vout fb so-8 APE8969m en vin gnd gnd gnd gnd 1 2 3 4 8 7 6 5 vout fb esop-8 (gnd) en vin gnd nc nc nc APE8969x m : so-8 mp : esop-8 package
advanced power electronics corp. APE8969 absolute maximum ratings (at t a =25c) vin pin voltage(v in ) -------------------------------------- - gnd - 0.3v to gnd + 6.5v output voltage(v out ) ------------------------------------- - gnd - 0.3v to vin + 0.3v en pin voltage(v en ) -------------------------------------- - gnd - 0.3v to + 6.5v fb pin voltage(v fb ) --------------------------------------- gnd - 0.3v to + 6.5v power dissipation(p d ) ------------------------------------ - 1.65w storage temperature range(t st ) --------------------- -40c to +150c junction temperature range(t j ) --------------------- - -40c to 125c operating temperature range (t op ) ----------------- - -40c to +85c thermal resistance from junction to case(rth jc ) so-8 20c/w esop-8 15c/w so-8 60c/w esop-8 40c/w note: rth ja is measured with the pcb copper area of approximately 1 in2(multi-layer). that need connect to gnd pin. electrical specifications (t a =25c unless otherwise specified) parameter sym test condition min typ max units input voltage v in (note1) 2.6 - 6 v fb voltage v fb v in =2.6v to 6v, i out =1ma 0.784 0.8 0.816 v fb input leakage current i fb v fb =0.8v -100 - 100 na adjustable output voltage range v out v fb - 5.5 v quiescent current i q i out =0ma, v in =5v - 50 - a shutdown current i sd i out =0ma, v en =0v - - 1 a v out =1.50v - 1.1 1.3 v out =1.80v - 0.8 1 v out =2.50v - 0.57 0.7 v out =3.30v - 0.38 0.6 current limit (note 2) i limit 1.3 1.5 - a short circuit current i short v fb <0.3v - 300 - ma load regulation (note 3) ? a dropout voltage enable input threshold v c in =2.2 f,c o =2.2uf, i out =10ma i out =1.0a
advanced power electronics corp. APE8969 pin descriptions pin symbol pin description vin input voltage gnd ground active-low shutdown input. a logic low reduces the supply current to less than 1a. connect to vin or floating for normal operation. vout regulator output voltage. adjustable from 0.8v to 5.5v. feedback input for setting the output voltage. connect to an external resistor divider for adjustable output operation. block diagram function pin description en fb v out = 0.8 x (1 + r1/r2) 3 en fb current limit - + vin vout gnd error amp bandgap thermal shutdown enable en fb a minimum of 2.2f capacitor must be connected from vout to ground to insure stability. typically a large storage capacitor is connected from vin to ground to ensure that the input voltage does not sag below the minimum dropout voltage during the load transient response. this pin must always be dropout voltage higher than vout in order for the device to regulate properly. the APE8969 features an ldo regulator enable/disable function. to assure the ldo regulator will switch on; the en turn on control level must be greater than 2.0 volts. the ldo regulator will go into the shutdown mode when the voltage on the en pin falls below 0.8 volts. for to protecting the system, the APE8969 have a quick- discharge function. if the enable function is not needed in a specific application, it may be tied to vin to keep the ldo regulator in a continuously on state. the output is an adjustable version, the fb voltage is 0.8v. the output voltage can be set by outside resistances. the output voltage, vout, is then given by the followin g e q uation: for the reasons of reducing power dissipation and loop stability, r2 is recommending to choose 50k~300k
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advanced power electronics corp. APE8969 application information capacitor selection input-output (dropout) voltage current limit and short-circuit protection thermal considerations 4 normally, use a 2.2f capacitor on the input and a 2.2f capacitor on the output of the APE8969. larger input capacitor values and lower esr (x5r, x7r) provide better supply-noise rejection and transient response. a higher- value output capacitor (4.7f) may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. the APE8969 used a current sense-resistor to monitor the output current. a portion of the pmos output transistor?s current is mirrored to a resistor such that the voltage across this resistor is proportional to the output current. once the output current exceeds limit threshold, APE8969 would be protected with a limited output current. further more, when the output is short to ground, the output current would be folded-back to a less limit. like any low-dropout regulator, the APE8969 requires input and output decoupling capacitors. the device is specifically designed for portable applications requiring minimum board space and smallest components. these capacitors must be correctly selected for good performance (see capacitor characteristics section). please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. a regulator's minimum input-to-output voltage differential (dropout voltage) determines the lowest usable supply voltage. in battery-powered systems, this determines the useful end-of-life battery voltage. because the device uses a pmos, its dropout voltage is a function of drain-to source on-resistance, rds (on), multiplied by the load current: v dropout = v in -v out = r ds (on) x i out the APE8969 series can deliver a current of up to 1.2a over the full operating j unction temperature range. however, the maximum output current must be dated at higher ambient temperature to ensure the junction temperature does not exceed 125 o c. with all possible conditions, the junction temperature must be within the range specified under operating conditions. power dissipation can be calculated based on the output current and the voltage drop across regulator. p d = (v in - v out ) i out the final operating junction temperature for any set of conditions can be estimated by the following thermal equation: p d (max) = (t j (max) - t a ) / rth ja where t j (max) is the maximum junction temperature of the die (125 o c) and t a is the maximum ambient temperature. the junction to ambient thermal resistance (rth ja ) for so- 8 package at recommended minimum footprint is 60c/w. visit our website in which ?recommended footprints for soldering surface mount packages? for detail.
advanced power electronics corp. APE8969 application information pcb layout 5 an input capacitance of ~ 2.2f is required between the APE8969 input pin and ground (the amount of the capacitance may be increased without limit), this capacitor must be located a distance of not more than 1cm from the input and return to a clean analog ground. input capacitor can filter out the input voltage spike caused by the surge current due to the inductive effect of the package pin and the printed circuit board?s routing wire. otherwise, the actual voltage at the vin pin may exceed the absolute maximum rating. the output capacitor also must be located a distance of not more than 1cm from output to a clean analog ground. because it can filter out the output spike caused by the surge current due to the inductive effect of the package pin and the printed circuit board?s routing i
package outline : esop-8 millimeters symbols min nom max a 5.80 6.00 6.20 b 4.80 4.90 5.00 c 3.80 3.90 4.00 d 048 e 0.40 0.65 0.90 f 0.19 0.22 0.25 m 0.00 0.08 0.15 0.35 0.42 0.49 l 1.35 1.55 1.75 j k g p 2.15 2.25 2.35 q 2.15 2.25 2.35 1.all dimension are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : esop-8 advanced power electronics corp. h 0.375 ref. 45 1.27 typ. j l 8969mp ywwsss package code part number date code (ywwsss) y last digit of the year ww week sss sequence b a2 i q p
millimeters symbols min nom max a 1.35 1.55 1.75 a1 0.10 0.18 0.25 b 0.33 0.41 0.51 c 0.19 0.22 0.25 d 4.80 4.90 5.00 e 5.80 6.15 6.50 e1 3.80 3.90 4.00 e g l 0.38 0.90 0.00 4.00 8.00 1.all dimension are in millimeters. 2.dimension does not include mold protrusions. part marking information & packing : so-8 1.27 typ 0.254 typ package outline : so-8 advanced power electronics corp. e b 1 34 5 6 7 8 2 d e1 a1 a g part number 8969 m ywwsss package code date code (ywwsss) y last digit of the year ww week sss sequence e
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