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ame 1 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 n typical application the AME5249A is a fixed-frequency current mode syn- chronous pwm step down converter that is capable of delivering 600ma output current while achieving peak effi- ciency of 95%. under light load conditions, the AME5249A operates in a power saving mode that consumes just around 20 m a of supply current, maximizing battery life in portable applications. the AME5249A operates with a fixed frequency of 1.5mhz, minimizing noise in noise- sensitive applications and allowing the use of small ex- ternal components. the AME5249A is an ideal solution for applications powered by li-ion batteries or other por- table applications that require small board space. the AME5249A is available in a variety of fixed output voltage options, 1.0v, 1.2v, 1.3v, 1.5v, 1.8v, 2.5v, 2.7v, 2.8v, and 3.3v, and is also available in an adjustable output voltage version capable of generating output volt- ages from 0.6v to v in . the AME5249A is available in the tiny 5-pin sot-25 and tsot-25 package. n general description n features n applications l blue tooth headsets l portable audio players l mobile phones l wireless and dsl modems l digital still cameras l portable instruments l high efficiency - up to 95% l very low 20 m a quiescent current l guaranteed 600ma output current l 1.5mhz constant frequency operation pwm l internal synchronous rectifier eliminates schottky diode l adjustable output voltages from 0.6v to v in l fixed output voltage options available 1.0v, 1.2v, 1.3v, 1.5v, 1.8v, 2.5v, 2.7v, 2.8v and 3.3v l 100% duty cycle low-dropout operation l 0.1 m a shutdown current l require tiny capacitors and inductor l tiny sot-25 and tsot-25 package l all ame's lead free products meet rohs standards ame 5249 a in en gnd sw out c in 4 . 7 m f v in 2 . 5 v to 5 . 5 v l 4 . 7 m h v out c out 10 m f figure 1 . fixed voltage regulator figure 2 . adjustable voltage regulator ame 5249 a in en gnd sw fb c in 4 . 7 m f v in 2 . 5 v to 5 . 5 v l 4 . 7 m h v out c out 10 m f 1 . 8 v / 600 ma r 1 887 k r 2 442 k c 1 22 pf
ame 2 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 n function block diagram note: for the fixed output version the internal feedback divider is actived. for the adjustable version the internal feedback divider is disabled, and the fb pin is directly connected to the internal ea amplifer. 1 . 5 mhz oscillator slope comp uvlo ea + - bandgap fixed output see note comp + - s r current sense logic control thermal shudown current limit comparaotr driver comp + - fb gnd vin sw osc q figure 3 en
ame 3 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 n pin configuration AME5249A-aevxxx 1. en 2. gnd 3. sw 4. in 5. fb/out die attach: conductive epoxy sot-25/tsot-25 top view 1 3 2 5 4 ame 5249 a
ame 4 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 n pin description pin number pin name pin description 1 en enable control input. the enable pin is an active high control. tie this pin above 1.4v to enable the device. tie this pin below 0.4v to shut down the device. in shutdown, all function are disabled. do not leave en pin floating. 2 gnd ground tie directly to ground plane. 3 sw switch node connection to inductor. 4 in input supply voltage pin. bypass this pin with a capacitor as close to the device as possible 5 fb/out fb:output voltage feedback input. set the output voltage by selecting values for r1 and r2 using: r1 = r2 (v out /0.6v -1) connect the ground of the feedback network to an agnd (analog ground) plane which should be tied directly to the gnd pin. out:output pin
ame 5 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 n ordering information number of pins package type pin configuration special feature AME5249A - x x x xxx x output voltage a 1. en e: sot-2x v: 5 adj: adjustable n/a: sot-25 (sot-25) 2. gnd 100: 1.0v l: tsot-25 (low profile) (tsot-25) 3. sw 120: 1.2v 4. in 130: 1.3v 5. fb/out 150: 1.5v 180: 1.8v 250: 2.5v 270: 2.7v 280: 2.8v 330: 3.3v special feature pin configuration package type number of pins output voltage
ame 6 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 n available options note: 1. the first 3 places represent product code. it is assigned by ame such as cbn. 2. a bar on top of first letter represents green part such as cbn. 3. the last 3 places mxx represent marking code. it contains m as date code in "month", xx as ln code and that is for ame internal use only. please refer to date code rule section for detail information. 4. 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 AME5249A-aevadj cbnmxx adj sot-25 -40 o c to + 85 o c
ame 7 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 n absolute maximum ratings n thermal information caution: stress above the listed absolute maximum rating may cause permanent damage to the device. * hbm b:2000v~3999v n recommended operating conditions * measure q jc on backside center of molding compund if ic has no tab. ** mil-std-202g 210f parameter symbol maximum unit input voltage v in -0.3 to +6.5 v en, fb v en , v fb -0.3 to v in v sw, v out v sw , v out -0.3 to v in v esd classification b* parameter symbol rating unit input supply voltage v in -0.3 to 6.5 v ambient temperature range t a -40 to +85 junction temperature range t j -40 to +125 storage temperature range t stg -65 to +150 o c parameter package die attach symbol maximum unit thermal resistance (junction to case) q jc 81 thermal resistance (junction to ambient) q ja 260 internal power dissipation p d 400 mw 350 o c sot-25* tsot-25 solder iron (10 sec)** conductive epoxy o c / w
ame 8 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 n electrical specifications v in =3.6v, en=v in , t a = 25 o c, unless otherwise noted parameter symbol min typ max units i nput voltage v in 2.5 5.5 v -3 3 -3 3 output voltage accuracy (adj) d v out -3 3 adjustable output range v out v fb v in - 0.2 v 0.588 0.6 0.612 0.585 0.6 0.615 f eedback pin bias current i fb -50 50 na 300 400 20 35 s hutdown current i shdn 0.1 1 reference voltage line regulation d v fb 0.4 output voltage line regulation reg line 0.4 output voltage load regulation reg load 0.5 % h igh-side switch on-resistance r ds,on,hi 0.4 0.6 l ow-side switch on-resistance r ds,on,lo 0.35 0.5 s witch current limit i sw,cl 1 1.25 a s witch leakage current i sw,lk 0.01 1 m a s witch frequency f osc 1.2 1.5 1.8 s hort circuit oscillator frequency f osc,scr 0.21 m aximum duty cycle d max 100 % w mhz v en =0v, v sw =0v or 3.6v, v in =3.6v v fb =0.6v or v out =100% v fb =0v or v out =0v test condition v in =2.5 to 5.5v, v out =1.0v~1.8v pwm mode t a =-40 o c to +85 o c % v v in =v out + d v to 5.5v (note 1) pwm mode v in =v out + d v to 5.5v (note 1) v out =2.5v~3.3v, pwm mode t a =25 o c i q q uiescent current v fb =0.5v or v out =90%, i out =0a v fb =0.62v or v out =103%, i out =0a d v out o utput voltage accuracy (for every fixed output voltage) f eedback voltage v fb m a % /v i out =100ma to 600ma i sw =100ma i sw =-100ma v in =3v, v out =1.2v 2 .5 ?? v in ?? 5.5v v en =0v, v in =4.2v 2.5 ?? v in ?? 5.5v
ame 9 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 n electrical specifications (contd.) note 1: d v=i out x r ds.on.hi v in =3.6v, en=v in , t a = 25 o c, unless otherwise noted parameter symbol min typ max units i nput undervoltage lockout v uvlo 2 2.15 2.3 i nput undervoltage lockout hysteresis v uvlo,hyst 0.1 e nable high (enabled the device) v en,hi 1.4 e nable low (shutdown the device) v en,lo 0.4 e n input current (enable the device) i en 0.01 1 m a t hermal shutdown temperature o tp 160 t hermal shutdown hysteresis o th 30 r estore, temperature increasing s hutdown, temperature increasing v in rising test condition o c v
ame 10 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 n detailed description main control loop the AME5249A utilizes a fixed-frequency,current-mode pwm control scheme combined with fully-integrated power mosfets to produce a compact and efficient step- down dc-dc solution. during normal operation the high- side mosfet turns on each cycle and remains on until the current comparator turns it off. at this point the low- side mosfet turns on and remains on until either the end of the switching cycle or until the inductor current approaches zero. the error amplifier adjusts the current comparator's threshold according to the load current to ensure that the output voltage remains in regulation. light load power saving mode operation the AME5249A is capable of power saving mode op- eration in which the internal power mosfets operate intermittently based on load demand. in power saving mode operation, the peak current of the inductor is set to a certain value which increases as the input voltage increases, such as 260ma for 3.6v in- put voltage and 340ma for 5.5v input voltage, approxi- mately. each switching event can last from a single cycle at very light loads to few cycles within the active intervals at moderate loads. between these switching intervals, the unneeded circuitry are turned off, reducing the quies- cent current to 20 m a. in this turned off state, the load current is being supplied solely from the output capaci- tor. as the output voltage droops, the internal comparator trips and turns on the circuits. this process repeats at a rate depends on the load demand. dropout operation as the input supply voltage decreases to a value ap- proaching the output voltage, the duty cycle increases toward the maximum on-time. further reduction of the supply voltage forces the main switch to remain on for more than one cycle until it reaches 100% duty cycle. the output voltage will then be determined by the input voltage minus the voltage drop across the p-channel mosfet and the inductor. current limit protection the AME5249A has current limiting protection to pre- vent excessive stress on itself and external components. the internal current limit comparator will disable the power device at a switch peak current limit. under ex- treme overloads, such as short-circuit conditions, the AME5249A reduces it's oscillator frequency to around 210khz to allow further inductor current reduction and to minimize power dissipation. soft start the AME5249A integrates a soft start function that pre- vents input inrush current and output overshoot during start-up. during start-up the switch current limit is in- creased in steps. the start-up time thereby depends on the output capacitor and load current demanded at start- up. typical start-up times with a 10 m f output capacitor, 3.6v input voltage and 1.5v output voltage, for 250ma load is 120 m s. thermal shutdown the device protects itself from overheating with an in- ternal thermal shutdown circuit. if the junction tempera- ture exceeds the thermal shutdown trip point, the device turns off. the part is restarted when the junction tem- perature drops 30 o c below the thermal shutdown trip point. under voltage protection the AME5249A has an uvp comparator to turn the power device off in case the input voltage or battery voltage is too low.
ame 11 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 n application information the typical AME5249A application circuit is shown in figure1. the external component selection is driven by the load requirement. inductor selection although the inductor does not influence the operating frequency, the inductor value has a direct effect on ripple c u r r e n t . t h e i n d u c t o r r i p p l e c u r r e n t i ? l decreases with higher inductance and increases with higher v in or v out : in out sw out in l v v f l v v i - = d the inductor must have a saturation (incremental) cur- rent rating equal to the peak switch-current limit. for high efficiency, minimize the inductor's dc resistance. the inductor value also has an effect on power saving mode operation. lower inductor values (higher ripple cur- rent) will cause the transition from pwm to power saving mode to occur at lower load currents, which can cause a dip in efficiency in the upper range of low current opera- tion. inductor core selection once the value for l is known, the type of inductor must be selected. high efficiency converters generally cannot afford the core loss found in low cost powdered iron cores, forcing the use of more expensive ferrite or mollypermalloy cores. actual core loss is independent of core size for a fixed inductor value but it is very depen- dent on the inductance selected. as the inductance in- creases, core losses decrease. unfortunately, increased inductance requires more turns of wire and therefore cop- per losses will increase. ferrite designs have very low core losses and are preferred at high switching frequen- cies, so design goals can concentrate on copper loss and preventing saturation. ferrite core material saturates "hard", which means that inductance collapses abruptly when the peak design current is exceeded. this result in an abrupt increase in inductor ripple current and conse- quent output voltage ripple. do not allow the core to satu- rate! different core materials and shapes will change the size/current and price/current relationship of an inductor. toroid or shielded pot cores in ferrite or permalloy ma- terials are small and don't radiate energy but generally cost more than powdered iron core inductors with similar characteristics. the choice of which style inductor to use mainly depends on the price vs. size requirements and any radiated field/emi requirements. input capacitor selection in continuous mode, the source current of the main power mosfet is a square wave of duty cycle v out /v in . to prevent large voltage transients, a low esr input ca- pacitor sized for the maximum rms current must be used. the input filter capacitor supplies current to the main power mosfet of AME5249A in the first half of each cycle and reduces voltage ripple imposed on the input power source. a ceramic capacitor's low esr provides the best noise filtering of input voltage spikes due to this rapidly chang- ing current. select a capacitor with sufficient ripple cur- rent rating. the input capacitor's maximum rms capacitor current is given by: where the maximum average output current i max equals the peak current i lim minus half peak-to-peak ripple cur- rent, i max =i lim - i ? l /2. this formula has a maximum at v in =2v out , where i rms =i out /2. this simple worst-case condition is commonly used for design because even significant deviations do not offer much relief. note that ripple current ratings from capacitor manufacturers are often based on only 2000 hours of life which makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher tem- perature than required. several capacitors may also be paralleled to meet size or height requirements in the de- sign. in out out in max rms v v v v i i ) ( - ?
ame 12 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 output capacitor selection the selection of c out is driven by the required effective series resistance (esr). typically, once the esr re- quirement for c out has been met, the rms current rating generally far exceeds the i ripple (p-p) requirement. the output ripple v out is determined by ) 8 1 ( sw out l out f c esr i v + d ? d where f sw =operating frequency, c out =output capaci- t a n c e a n d i ? l =ripple current in the inductor. for a fixed output voltage, the output ripple is highest at maximum i n p u t v o l t a g e s i n c e i ? l increases with input voltage. at the light load current, the device operates in power saving mode, and the output voltage ripple is indepen- dent of the value of the output capacitor. the output ripple is set by the internal comparator thresholds and is also affected by the feedback capacitor c1 in figure2. large capacitor values can decrease the output ripple, usually a 22pf capacitor is sufficient for most applications. when the input and output ceramic capacitors are cho- sen, choose the x5r or x7r dielectric formulations. these dielectrics have the best temperature and voltage char- acters have the best temperature and voltage character- istics of all the ceramics for a given value and size. output voltage setting in the adjustable version, the output voltage is set by a resistor divider according to following formula: ) 1 2 1 ( 6 . 0 r r v v out + = the external resistor divider is connected to the output. thermal considerations in most applications the AME5249A does not dissi- pate much heat due to its high efficiency. but, in applica- tions where the AME5249A is running at high ambient temperature with low supply voltage and high duty cycles, such as in dropout, the heat dissipated may exceed the maximum junction temperature of the part. if the junc- tion temperature reaches approximately 160 o c, both power switches will be turned off and the sw node will become high impedance. to avoid the AME5249A from exceeding the maximum junction temperature, the user will need to do some thermal analysis. the goal of the thermal analysis is to determine whether the power dis- sipated exceeds the maximum junction temperature of the part. the temperature rise is given by: ja pd tr q = ) ( where pd is the power dissipated by the regulator and q j a is the thermal resistance from the junction of the die to the ambient temperature.
ame 13 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 figure 4. AME5249A with 1.2v output figure 5. AME5249A with 1.5v output figure 6. AME5249A with 2.5v output n typical application figure 7. AME5249A with 3.3v output ame 5249 a in en gnd sw fb c in 4 . 7 m f v in 2 . 5 v to 5 . 5 v l 4 . 7 m h v out c out 10 m f 1 . 2 v / 600 ma r 1 442 k r 2 442 k c 1 22 pf ame 5249 a in en gnd sw fb c in 4 . 7 m f v in 2 . 5 v to 5 . 5 v l 4 . 7 m h v out c out 10 m f 1 . 5 v / 600 ma r 1 475 k r 2 316 k c 1 22 pf ame 5249 a in en gnd sw fb c in 4 . 7 m f v in 2 . 7 v to 5 . 5 v l 4 . 7 m h v out c out 10 m f 2 . 5 v / 600 ma r 1 887 k r 2 280 k c 1 22 pf ame 5249 a in en gnd sw fb c in 4 . 7 m f v in 3 . 6 v to 5 . 5 v l 4 . 7 m h v out c out 10 m f 3 . 3 v / 600 ma r 1 887 k r 2 196 k c 1 22 pf
ame 14 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 efficiency vs output current 10 20 30 40 50 60 70 80 90 100 0 . 1 1 10 100 1000 output current ( ma ) e f f i c i e n c y ( % ) v in = 2 . 7 v v in = 3 . 6 v v in = 4 . 2 v v out = 2 . 5 v 10 20 30 40 50 60 70 80 90 100 0 . 1 1 10 100 1000 v in = 2 . 7 v v in = 3 . 6 v v in = 4 . 2 v output current ( ma ) e f f i c i e n c y ( % ) v out = 1 . 5 v efficiency vs output current reference voltage vs temperature 1 . 30 1 . 35 1 . 40 1 . 45 1 . 50 1 . 55 1 . 60 1 . 65 1 . 70 - 40 - 15 + 10 + 35 + 60 + 85 + 110 temperature ( o c ) o s c i l l a t o r f r e q u e n c y ( m h z ) v in = 3 . 6 v oscillator frequency vs temperature oscillator frequency vs supply voltage quiescent current vs input voltage 0 5 10 15 20 25 30 35 40 45 50 2 . 5 3 . 5 4 . 5 5 . 5 v in ( v ) q u i e s c e n t c u r r e n t ( m a ) v in = 3 . 6 v v out = 1 . 8 v i out = 0 a 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 2.5 3.5 4.5 5.5 v in (v) o s c i l l a t o r f r e q u e n c y ( m h z ) 0 . 580 0 . 585 0 . 590 0 . 595 0 . 600 0 . 605 0 . 610 0 . 615 0 . 620 - 40 - 15 + 10 + 35 + 60 + 85 + 110 temperature ( o c ) r e f e r e n c e v o l t a g e ( v ) v in = 3 . 6 v n characterization curve
ame 15 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 quiescent current vs temperature light load mode load step 0 5 10 15 20 25 30 35 40 45 50 - 40 - 15 + 10 + 35 + 60 + 85 + 110 temperature ( o c ) q u i e s c e n t c u r r e n t ( m a ) v in = 3 . 6 v v out = 1 . 8 v i out = 0 a load step load step load step i out 500 ma / div v out 100 mv / div i l 500 ma / div ac coupled v in = 3 . 6 v v out = 1 . 8 v i out = 50 ma to 600 ma 20 m s / div i out 500 ma / div v out 100 mv / div i l 500 ma / div ac coupled v in = 3 . 6 v v out = 1 . 8 v i out = 100 ma to 600 ma 20 m s / div i out 500 ma / div v out 100 mv / div i l 500 ma / div ac coupled v in = 3 . 6 v v out = 1 . 8 v i out = 200 ma to 600 ma 20 m s / div i out 500 ma / div v out 100 mv / div i l 500 ma / div ac coupled v in = 3 . 6 v v out = 1 . 8 v i out = 0 ma to 600 ma 20 m s / div v sw 5 v / div v out 100 mv / div i l 200 ma / div ac coupled v in = 3 . 6 v v out = 1 . 8 v i out = 50 ma 5 m s / div n characterization curve (contd.)
ame 16 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 stead state test r ds(on) vs input voltage r ds(on) vs temperature 0 . 1 0 . 2 0 . 3 0 . 4 0 . 5 0 . 6 0 . 7 - 40 - 15 + 10 + 35 + 60 + 85 + 110 temperature ( o c ) r d s ( o n ) ( w ) v in = 3 . 6 v high - side switch low - side switch 0.1 0.2 0.3 0.4 0.5 0.6 0.7 2.5 3.5 4.5 5.5 input voltage(v) r d s ( o n ) ( w ) high-side switch low-side switch 1 . 77 1 . 78 1 . 79 1 . 80 1 . 81 1 . 82 1 . 83 1 . 84 1 . 85 1 . 86 1 . 87 0 100 200 300 400 500 600 output current ( ma ) o u t p u t v o l t a g e ( v ) output voltage vs output current start up from en v sw 2 v / div v in 200 mv / div i l 100 ma / div ac coupled v out 20 mv / div ac coupled v in = 3 . 6 v v out = 1 . 8 v i out = 300 ma 1 m s / div current limit vs v in 0 . 7 0 . 8 0 . 9 1 . 0 1 . 1 1 . 2 1 . 3 1 . 4 1 . 5 1 . 6 1 . 7 1 . 8 1 . 9 2 . 5 2 . 8 3 . 1 3 . 4 3 . 7 4 . 0 4 . 3 4 . 6 4 . 9 5 . 2 5 . 5 v in ( v ) c u r r e n t l i m i t ( a ) v out = 1 . 2 v n characterization curve (contd.) i l 500 ma / div v out 2 v / div en 5 v / div v in 5 v / div v in = 5 v v out = 3 . 3 v i out = 600 ma 40 m s / div
ame 17 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 current limit vs temperature - 40 - 25 - 10 + 5 + 20 + 35 + 50 + 65 + 80 + 95 + 110 temperature ( o c ) + 125 0 . 70 0 . 80 0 . 90 1 . 00 1 . 10 1 . 20 1 . 30 1 . 40 1 . 50 1 . 60 1 . 70 1 . 80 1 . 90 2 . 00 2 . 10 c u r r e n t l i m i t ( a ) v in = 5 . 0 v v in = 3 . 6 v v in = 3 . 3 v v out = 1 . 2 v n characterization curve (contd.)
ame 18 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 n date code rule 1: january 7: july 2: february 8: august 3: march 9: september 4: april a: october 5: may b: november 6: june c: december month code year a a a m x x xxx0 a a a m x x xxx1 a a a m x x xxx2 a a a m x x xxx3 a a a m x x xxx4 a a a m x x xxx5 a a a m x x xxx6 a a a m x x xxx7 a a a m x x xxx8 a a a m x x xxx9 marking n tape and reel dimension sot-25 w p ame ame pin 1 package carrier width (w) pitch (p) part per full reel reel size sot-25 8.00.1 mm 4.00.1 mm 3000pcs 1801 mm carrier tape, number of components per reel and reel size
ame 19 AME5249A 1.5mhz, 600ma synchronous buck converter rev.a.01 n tape and reel dimension (contd.) tsot-25 package carrier width (w) pitch (p) part per full reel reel size tsot-25 8.00.1 mm 4.00.1 mm 3000pcs 1801 mm w p ame ame pin 1 carrier tape, number of components per reel and reel size
ame 20 1.5mhz, 600ma synchronous buck converter AME5249A rev.a.01 n package dimension sot-25 tsot-25 l top view side view front view c 1 d s 1 e e h a 1 b a pin 1 l top view side view front view c 1 d s 1 e e h a 1 b a pin 1 min max min max a+a 1 0.90 1.25 0.0354 0.0492 b 0.30 0.50 0.0118 0.0197 d 2.70 3.10 0.1063 0.1220 e 1.40 1.80 0.0551 0.0709 e h 2.40 3.00 0.0945 0.1181 l q 1 0 o 10 o 0 o 10 o s 1 1.90 bsc 0.07480 bsc symbols millimeters inches 0.35bsc 0.0138bsc 0.95bsc 0.0374bsc min max min max a 0.90 1.30 0.0354 0.0512 a 1 0.00 0.15 0.0000 0.0059 b 0.30 0.55 0.0118 0.0217 d 2.70 3.10 0.1063 0.1220 e 1.40 1.80 0.0551 0.0709 e h 2.60 3.00 0.1024 0.1181 l q 1 0 o 10 o 0 o 10 o s 1 0.37 bsc 0.0146 bsc 0.95 bsc 0.0374 bsc symbols millimeters inches 1.90 bsc 0.0748 bsc
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. , august 2011 document: 3005-ds5249a-a.01 corporate headquarter ame, inc. 2f, 302 rui-guang road, nei-hu district taipei 114, taiwan, r.o.c. tel: 886 2 2627-8687 fax: 886 2 2659-2989 www.ame.com.tw e-mail: sales@ame.com.tw

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