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ame 1 ame8844 750ma cmos ldo rev.f.01 n functional block diagram (fixed versions) the ame8844 family of positive, linear regulators fea- ture low quiescent current (45 m a typ.) with low dropout voltage, making them ideal for battery applications. output voltages are set at the factory and trimmed to 1.5% accuracy. these rugged devices have both thermal shutdown, and current fold-back to prevent device failure under the "worst" operating conditions. an additional feature is a ? power good ? detector, which pulls low when the output is out of regulation . the ame8844 is stable with an output capacitance of 4.7 m f or greater. l instrumentation l portable electronics l wireless devices l pc peripherals l battery powered widgets n general description n features n applications (adjustable version) (external) (external) overcurrent shutdown thermal shutdown amp in 1.242v gnd out r1 r2 en adj gnd out in pg overcurrent shutdown thermal shutdown en v ref v ref x85% v ref x115% amp r2 r1 n typical applications ame8844 out in c3 4.7 m f c1 1 m f gnd out en pg in 5v l very low dropout voltage l guaranteed 750ma output l accurate to within 1.5% l 45 m a quiescent current typically l over-temperature shutdown l current limiting l short circuit current fold-back l noise reduction bypass capacitor (fixed versions) l power-saving shutdown mode l space-saving msop-8 package l 6 factory pre-set output voltages l low temperature coefficient l adjustable version l power good output function. l all ame' s lead free products meet rohs standards
ame 2 750ma cmos ldo ame8844 rev.f.01 n pin configuration msop-8 top view ame 8844ceqaxxx 1. en 2. in 3. nc 4. out 5. gnd 6. gnd 7. pg 8. gnd * die attach: conductive epoxy msop-8 top view ame 8844beqaadj 1. en 2. in 3. adj 4. out 5. gnd 6. gnd 7. gnd 8. gnd * die attach: conductive epoxy n pin description 1 3 2 4 5 6 7 8 ame8844 1 3 2 4 5 6 7 8 ame8844 ame8844beqa ame8844ceqa 1 1 en enable pin. when pulled low, the pmos pass transistor turns off, current consuming less than 1a. 2 2 in input voltage pin. it should be decoupled with 1 m f or greater capacitor. 3 n/a adj feedback output voltage for adjustable device. n/a 3 n c no connection. 4 4 out ldo voltage regulator output pin. it should be decoupled with a 4.7 f or greater value low esr ceramic capacitor. n/a 7 pg power-good output. this open-drain output is low when output is out of regulation. 5, 6, 7, 8 5, 6, 8 gnd ground connection pin. pin number pin name pin description
ame 3 ame8844 750ma cmos ldo rev.f.01 n ordering information operating ambient temperature range number of pins package type pin configuration special feature ame8844 x x x x xxx x output voltage b: 1. en e: -40 o c to +85 o c q: msop a: 8 adj: adjustable z: lead free (msop-8) 2. in 150: v=1.5v 3. adj 180: v=1.8v 4. out 250: v=2.5v 5. gnd 330: v=3.3v 6. gnd 7. gnd 8. gnd c: 1. en (msop-8) 2. in 3. nc 4. out 5. gnd 6. gnd 7. pg 8. gnd special feature pin configuration output voltage operating ambient temperature range package type number of pins
ame 4 750ma cmos ldo ame8844 rev.f.01 n ordering information note: yww represents the date code * a line on top of the first character represents lead free plating such as 8844 please consult ame sales office or authorized rep./distributor for the availability of output voltage and package type. part number marking* output voltage package operating ambient temperature range ame8844beqaadj 8844 byww adj msop-8 - 40 o c to +85 o c ame8844beqaadjz 8844 byww adj msop-8 - 40 o c to +85 o c AME8844CEQA250Z 8844 nyww 2.50 msop-8 - 40 o c to +85 o c
ame 5 ame8844 750ma cmos ldo rev.f.01 n absolute maximum ratings n recommended operating conditions n thermal information caution: stress above the listed absolute maximum rating may cause permanent damage to the device. * hbm b: 2000~3999v * measure q jc on center of molding compound if ic has no tab. ** mil-std-202g 210f parameter package die attach symbol maximum unit thermal resistance * (junction to case) q jc 100 thermal resistance (junction to ambient) q ja 206 internal power dissipation p d 625 mw 150 o c 350 o c maximum junction temperature solder iron(10 sec)** msop-8 conductive epoxy o c / w parameter maximum unit input voltage -0.3 to +8 v en voltage -0.3 to +8 v output voltage -0.3 to v in + 0.3 v pg voltage -0.3 to v in + 0.3 v output current p d / (v in - v out ) ma esd classification b* parameter symbol rating unit ambient temperature range t a - 40 to +85 o c junction temperature range t j - 40 to +125 o c storage temperature range t stg - 65 to +150 o c
ame 6 750ma cmos ldo ame8844 rev.f.01 n electrical specifications parameter symbol min typ max units input voltage v in note 1 7 v output voltage accuracy v o -1.5 1.5 % v o(nom) =1.5v 1000 v o(nom) =1.8v 650 v o(nom) >=2.0v 500 output current i o 750 ma current limit i lim 750 ma short circuit current i sc 750 ma quiescent current i q 45 70 m a ground pin current i gnd 45 m a v o <2.0v -0.15 0.15 % 4.0>v o >=2.0v -0.1 0.02 0.1 % 4.0v<= v o -0.4 0.4 % load regulation reg load -1 0.2 1 % over temerature shutdown ots 150 o c over temerature hysterisis oth 30 o c v o temperature coefficient tc 30 ppm/ o c adj input bias current i adj 1 m a minimum load current i load 70 m a adj reference voltage v ref 1.221 1.240 1.26 v f=1khz 75 f=10khz 55 f=100khz 30 v eh 2.0 vin v v el 0 0.4 v i eh 1 m a i el 1 m a psrr en v in =2.7v to 7v v en =v in , v in =2.7v to 7v v en =0v, v in =2.7v to 7v 30 m vrms en input threshold v in =2.7v to 7v power supply rejection i o =100ma c o =4.7 m f ceramic f=10hz to 100khz i o =10ma co=4.7 m f en input bias current output voltage noise test condition dropout voltage v dropout line regulation i o =1ma to 750ma reg line i o =1ma i o =1ma to 750ma i o =1ma v in =v o +1 to v o +2 i o =0ma i o =750ma v o =v onom -2.0% v in =v o(nom) +1v, v o <0.4v mv v o >1.2v v o >1.2v v in = 2.5v db see chart v in = v o(nom) +2v, v en = v in , t a = 25 o c unless otherwise noted
ame 7 ame8844 750ma cmos ldo rev.f.01 parameter symbol min typ max units shutdown supply current i sd 0.5 2 m a output under voltage v uv 84 %v o(nom) output over voltage v ov 105 %v o(nom) pg leakage current i lc 1 m a pg voltage low v ol 0.4 v v pg =7v i sink =0.25ma v in =5v, v o =0v, v en ame 8 750ma cmos ldo ame8844 rev.f.01 the ame8844 family of cmos regulators contain a pmos pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. the p-channel pass transistor receives data from the error amplifier, over-current shutdown, and thermal pro- tection circuits. during normal operation, the error ampli- fier compares the output voltage to a precision reference. over-current and thermal shutdown circuits become ac- tive when the junction temperature exceeds 140 o c, or the current exceeds 2.2a. during thermal shutdown, the output voltage remains low. normal operation is restored when the junction temperature drops below 120 o c. the ame8844 behaves like a current source when the load reaches 2.2a. however, if the load impedance drops below 0.3 ohms, the current drops back to 600ma to prevent excessive power dissipation. normal operation is restored when the load resistance exceeds 0.75 ohms. n detailed description n external capacitors the ame8844 is stable with an output capacitor to ground of 4.7 m f or greater. ceramic capacitors have the lowest esr, and will offer the best ac performance. con- versely, aluminum electrolytic capacitors exhibit the high- est esr, resulting in the poorest ac response. unfortu- nately, large value ceramic capacitors are comparatively expensive. one option is to parallel a 0.1 m f ceramic capacitor with a 10 m f aluminum electrolytic. the benefit is low esr, high capacitance, and low overall cost. a second capacitor is recommended between the in- put and ground to stabilize vin. the input capacitor should be at least 0.1 m f to have a beneficial effect. all capacitors should be placed in close proximity to the pins. a "quiet" ground termination is desirable. this can be achieved with a "star" connection. n enable when en pin is pulled low, the pmos pass transistor shuts off, and all internal circuits are powered down. in this state, the quiescent current is less than 2 m a. this pin behaves much like an electronic switch. 100k ohms resistor is necessary between v en source and en pin when v en is higher than v in . n adjustable version the adjustable version uses external feedback resis- tors to generate an output voltage anywhere from 1.5v to 5.0v. vadj is trimmed to 1.24v and v out is given by the equation: v out = vadj ( 1 + r1 / r2 ) feedback resistors r1 and r2 should be high enough to keep quiescent current low, but increasing r1 + r2 w i l l r e d u c e s t a b i l i t y . i n g e n e r a l , r 1 a n d r 2 i n t h e 1 0 o f ?s k w will produce adequate stability, given reasonable lay- out precautions. to improve stability characteristics, keep parasitics on the adj pin to a minimum, and lower r1 and r2 values. n power good the ame8844 includes the power good feature. when the output is not within ?5% of the specified voltage, it pulls low. this can occur under the following conditions: 1) input voltage too low. 2) during over-temperature. 3) during over-current. 4) if output is pulled up. (note: pg pin is an open-drain output.) (note: there is no internal pull-up for en pin. it can not be floating)
ame 9 ame8844 750ma cmos ldo rev.f.01 dropout voltage vs i load quiescent current vs. temperature ground current vs. v in v out vs. temperature(2.5v) ground current vs. load current dropout voltage vs v out d r o p o u t v o l t a g e ( v ) i load (a) 0 0.2 0.4 0.6 0.8 1 1.2 0 0.3 0.6 0.9 1.2 1.5 1.8 1.8 2.0 2.1 2.8 3.3 v out =1.5 d r o p o u t v o l t a g e ( v ) v out (v) 0 0.2 0.4 0.6 0.8 1 0 2 4 6 8 i load =1.5a i load =1.0a i load =0.5a temperature ( o c) q u i e s c e n t c u r r e n t @ 5 v ( u a ) 25 27 29 31 33 35 37 39 41 -45 -5 25 55 85 115 g r o u n d c u r r e n t ( m a ) v in (v) 10 15 20 25 30 35 40 45 50 2 3 4 5 6 7 8 i out = 140ma v out = 1.5v 2.475 2.480 2.485 2.490 2.495 2.500 -45 -5 25 55 85 115 o u t p u t v o l t a g e ( v ) temperature ( o c) g r o u n d c u r r e n t ( m a ) load current (a) 34.5 35 35.5 36 36.5 37 37.5 38 38.5 0 0.25 0.5 0.75 1 1.25 1.5 v in = 2.5v v out = 1.5v
ame 10 750ma cmos ldo ame8844 rev.f.01 load step 40ma to 1.5a dropout voltage vs. load current(2.5v) line transient response load regulation vs. temperature current limit response ame8844beqa vadj vs. temperature l o a d r e g u l a t i o n ( % ) temperature ( o c) 0.00 0.05 0.10 0.15 0.20 0.25 0.30 -45 -5 25 55 85 115 0 50 100 150 200 250 300 350 400 0.3 0.6 0.9 1.2 1.5 115 o c 85 o c 55 o c 25 o c -5 o c -45 o c load current (a) d r o p o u t v o l t a g e @ 1 . 5 a ( m v ) v a d j ( v ) temperature ( o c) 1.235 1.236 1.237 1.238 1.239 1.240 1.241 1.242 1.243 1.244 -45 -5 25 55 85 115 v i n ( 2 v / d i v ) v o u t ( 5 0 m v / d i v ) time (20 m s/div) c in = 4.7 m f c out = 4.7 m f t r = t f = 1 m s vout = 1.5v 0 v o u t 1 0 m v / d i v i l o a d 1 a / d i v time 500 m s/div 0 c in = 4.7 m f c out = 4.7 m f v in = 4.0v v out = 1.8v i l o a d 1 a / d i v v o u t 1 v / d i v time 1ms/div i lim i sc 0a 0v v in = 5v c in = 4.7 m f c out = 4.7 m f
ame 11 ame8844 750ma cmos ldo rev.f.01 short circuit current vs. v in overtemperature shutdown stability vs. esr vs. i load stability vs. esr vs. i load stability vs. esr vs. i load current limit vs. v in 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 2 3 4 5 6 7 8 c u r r e n t l i m i t ( a ) v in (v) c in = 4.7 m f c out = 4.7 m f v out = 1.8v s h o r t c i r c u i t c u r r e n t ( a ) v in (v) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 2 3 4 5 6 7 8 c in = 4.7 m f c out = 4.7 m f c l e s r ( w ) iload (ma) 0.01 0.1 1 10 100 1000 10000 0 250 500 750 1000 1250 1500 stable region untested region unstable region c l =5 m f 0.01 0.1 1 10 100 1000 10000 0 250 500 750 1000 1250 1500 stable region untested region unstable region c l =2 m f c l e s r ( w ) iload (ma) 0.001 0.01 0.1 1 10 100 1000 10000 0 250 500 750 1000 1250 1500 stable region untested region unstable region c l =10 m f c l e s r ( w ) iload (ma) v o u t 1 v / d i v i o u t 1 a / d i v time 100ms/div 0v 0a v in = 4v c in = 4.7 m f c out = 4. 7 m f
ame 12 750ma cmos ldo ame8844 rev.f.01 n external resistor divider table r1 (k ohm) 1 2 5 10 20 vout 1.30 20.67 41.33 103.33 206.67 413.33 1.35 11.27 22.55 56.36 112.73 225.45 1.40 7.75 15.50 38.75 77.50 155.00 1.45 5.90 11.81 29.52 59.05 118.10 1.50 4.77 9.54 23.85 47.69 95.38 1.55 4.00 8.00 20.00 40.00 80.00 1.60 3.44 6.89 17.22 34.44 68.89 1.65 3.02 6.05 15.12 30.24 60.49 1.70 2.70 5.39 13.48 26.96 53.91 1.75 2.43 4.86 12.16 24.31 48.63 1.80 2.21 4.43 11.07 22.14 44.29 1.85 2.03 4.07 10.16 20.33 40.66 1.90 1.88 3.76 9.39 18.79 37.58 1.95 1.75 3.49 8.73 17.46 34.93 2.00 1.63 3.26 8.16 16.32 32.63 2.05 1.53 3.06 7.65 15.31 30.62 2.10 1.44 2.88 7.21 14.42 28.84 2.15 1.36 2.73 6.81 13.63 27.25 2.20 1.29 2.58 6.46 12.92 25.83 2.25 1.23 2.46 6.14 12.28 24.55 2.30 1.17 2.34 5.85 11.70 23.40 2.35 1.12 2.23 5.59 11.17 22.34 2.40 1.07 2.14 5.34 10.69 21.38 2.45 1.02 2.05 5.12 10.25 20.50 2.50 0.98 1.97 4.92 9.84 19.68 2.55 0.95 1.89 4.73 9.47 18.93 2.60 0.91 1.82 4.56 9.12 18.24 2.65 0.88 1.76 4.40 8.79 17.59 2.70 0.85 1.70 4.25 8.49 16.99 2.75 0.82 1.64 4.11 8.21 16.42 2.80 0.79 1.59 3.97 7.95 15.90 2.85 0.77 1.54 3.85 7.70 15.40 2.90 0.75 1.49 3.73 7.47 14.94 2.95 0.73 1.45 3.63 7.25 14.50 3.00 0.70 1.41 3.52 7.05 14.09 3.05 0.69 1.37 3.43 6.85 13.70 3.10 0.67 1.33 3.33 6.67 13.33 r2(kohm)=(1.24*r1(kohm))/(vout-1.24)
ame 13 ame8844 750ma cmos ldo rev.f.01 n external resistor divider table (contd.) note: small load(greater than 2 ma) is necessary as r1 or r2 is larger than 50 k ohm. otherwise, outputvoltage probably cannot be pulled down to 0 v on disable mode. r1 (k ohm) 1 2 5 10 20 vout 3.15 0.65 1.30 3.25 6.49 12.98 3.20 0.63 1.27 3.16 6.33 12.65 3.25 0.62 1.23 3.08 6.17 12.34 3.30 0.60 1.20 3.01 6.02 12.04 3.35 0.59 1.18 2.94 5.88 11.75 3.40 0.57 1.15 2.87 5.74 11.48 3.45 0.56 1.12 2.81 5.61 11.22 3.50 0.55 1.10 2.74 5.49 10.97 3.55 0.54 1.07 2.68 5.37 10.74 3.60 0.53 1.05 2.63 5.25 10.51 3.65 0.51 1.03 2.57 5.15 10.29 3.70 0.50 1.01 2.52 5.04 10.08 3.75 0.49 0.99 2.47 4.94 9.88 3.80 0.48 0.97 2.42 4.84 9.69 3.85 0.48 0.95 2.38 4.75 9.50 3.90 0.47 0.93 2.33 4.66 9.32 3.95 0.46 0.92 2.29 4.58 9.15 4.00 0.45 0.90 2.25 4.49 8.99 4.05 0.44 0.88 2.21 4.41 8.83 4.10 0.43 0.87 2.17 4.34 8.67 4.15 0.43 0.85 2.13 4.26 8.52 4.20 0.42 0.84 2.09 4.19 8.38 4.25 0.41 0.82 2.06 4.12 8.24 4.30 0.41 0.81 2.03 4.05 8.10 4.35 0.40 0.80 1.99 3.99 7.97 4.40 0.39 0.78 1.96 3.92 7.85 4.45 0.39 0.77 1.93 3.86 7.73 4.50 0.38 0.76 1.90 3.80 7.61 4.55 0.37 0.75 1.87 3.75 7.49 4.60 0.37 0.74 1.85 3.69 7.38 4.65 0.36 0.73 1.82 3.64 7.27 4.70 0.36 0.72 1.79 3.58 7.17 4.75 0.35 0.71 1.77 3.53 7.07 4.80 0.35 0.70 1.74 3.48 6.97 4.85 0.34 0.69 1.72 3.43 6.87 4.90 0.34 0.68 1.69 3.39 6.78 4.95 0.33 0.67 1.67 3.34 6.68 5.00 0.33 0.66 1.65 3.30 6.60 r2(kohm)=(1.242*r1(kohm))/(vout-1.242)
ame 14 750ma cmos ldo ame8844 rev.f.01 package carrier width (w) pitch (p) part per full reel reel size msop-8 12.00.1 mm 4.00.1 mm 4000pcs 3301 mm n tape and reel dimension msop-8 carrier tape, number of components per reel and reel size ame ame pin 1 w p a m e a m e
ame 15 ame8844 750ma cmos ldo rev.f.01 min max min max a - 1.07 - 0.04197 a 1 0.05 0.20 0.002 0.008 a2 0.81 0.92 0.032 0.036 b 0.28 0.38 0.011 0.015 b1 0.28 0.33 0.011 0.013 c 0.13 0.23 0.005 0.009 c1 0.13 0.17 0.005 0.006 d 2.90 3.10 0.114 0.122 e 4.77 4.98 0.188 0.196 e1 2.90 3.10 0.114 0.122 e e1 l 0.406 0.686 0.01598 0.02701 l1 l2 q 0 o 8 o 0 o 8 o symbols millimeters inches 0.65 typ 0.0255 typ 1.95 typ 0.0767 typ 0.94 ref 0.037 ref 0.010 typ 0.254 typ n package dimension msop-8 note: 1. controlling dimension : millimeter, converted inchdimension are not necessarily exact. 2. dimensiioning and tolerancing per ansi y14.5m-1994. 3. dimension "d" does not include mold flash,protrusion or gate burr, mold flash,protrusion and gate burr shall not exceed 0.15mm(0.006") per side. dimension e1 do not include inter-lead flash or protrusion, inter-lead flash and protrusion shall not ex- ceed 0.15mm(0.006") per side. 4. the package top be smaller than the package bottom. dimen- sion d and e1 are determined at outermost extremes of the plastic body exclusive of mold flash, tie bar burrs, gate burrs and interlead flash, but including any mismatch between the top and bottom of the plastic body. 5. dimension 'b' does not include dambar protrusion. allowable dambar protrusion shall be 0.08mm(0.0031) total in excess of the "b" dimension at maximum material condition. with plating base metal e r 0 . 127 ( 0 . 005 ) typ all corner & edges top pkg . top view front view end view e e 1 pin 1 i . d ( shinny surface ) d e 1 btm pkg . l l 1 l 2 detail a b a 1 a 2 a b b 1 c 1 c b section b - b e 1 b see detail a c
life support policy: these products of ame, inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of ame, inc. ame, inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. ? ame, inc. , may 2009 document: 2013-ds8844-f.01 corporate headquarter ame, inc. 2f, 302 rui-guang road, nei-hu dist. taipei 114 taiwan. tel: 886 2 2627-8687 fax: 886 2 2659-2989 www.ame.com.tw e-mail: sales@ame.com.tw

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