february 2010 doc id 16592 rev 2 1/10 10 let9045f rf power transistor from the ldmost family of n-channel enhancemen t-mode lateral mosfets features excellent thermal stability common source configuration pout = 45 w with 18.5 db gain @ 960 mhz beo free package in compliance with the 2002/95/ec european directive description the let9045f is a common source n-channel enhancement-mode lateral field-effect rf power transistor designed for broadband commercial and industrial applications at frequencies up to 1.0 ghz. the let9045f is designed for high gain and broadband performance operating in common source mode at 28 v. it is ideal for base station applications requiring high linearity. figure 1. pin out m250 epoxy sealed 1 3 2 1. drain 2. gate 3. source table 1. device summary order code package branding let9045f m250 let9045f www.st.com
maximum ratings let9045f 2/10 doc id 16592 rev 2 1 maximum ratings table 2. absolute maximum ratings (t case = 25 c) symbol parameter value unit v (br)dss drain-source voltage 80 v v gs gate-source voltage -0.5 to +15 v i d drain current 9 a p diss power dissipation (@ t c = 70 c) 108 w t j max. operating junction temperature 200 c t stg storage temperature -65 to +150 c table 3. thermal data symbol parameter value unit r th(jc) junction-case thermal resistance 1.2 c/w
let9045f electrical characteristics doc id 16592 rev 2 3/10 2 electrical characteristics t c = 25 c table 4. static symbol test conditions min. typ. max. unit v (br)dss v gs = 0 v; i ds = 10 ma 80 v i dss v gs = 0 v; v ds = 28 v 1 a i gss v gs = 20 v; v ds = 0 v 1 a v gs(q) v ds = 28 v; i d = 300 ma 2.0 5.0 v v ds(on) v gs = 10 v; i d = 3 a 0.9 1.2 v g fs v ds = 10 v; i d = 3 a 2.5 mho c iss v gs = 0 v; v ds = 28 v; f = 1 mhz 58 pf c oss v gs = 0 v; v ds = 28 v; f = 1 mhz 29 pf c rss v gs = 0 v; v ds = 28 v; f = 1 mhz 0.8 pf table 5. dynamic symbol test conditions min. typ. max. unit p out v dd = 28 v; i dq = 300 ma; p in = 1 w; f = 960 mhz 45 59 w g ps v dd = 28 v; i dq = 300 ma; p in = 1 w; f = 960 mhz 16.5 17.7 db h d v dd = 28 v; i dq = 300 ma; p in = 1 w; f = 960 mhz 60 65 % load mismatch v dd = 28 v; i dq = 300 ma; p in = 1 w; f = 960 mhz all phase angles 10:1 vswr
impedance data let9045f 4/10 doc id 16592 rev 2 3 impedance data figure 2. impedance data table 6. impedance data frequency z in ( ? )z dl ( ? ) 920 0.8 - j 0.08 5.3 + j 0.63 945 0.7 - j 0.4 5 + j 1.5 960 0.6 - j 0.6 4.7 + j 2 typical drain load ty p i c a l input g zin z dl d s
let9045f typical performances doc id 16592 rev 2 5/10 4 typical performances figure 3. gain vs output power and bias current, freq = 960 mhz, vdd = 28 v figure 4. gain and efficiency vs output power, freq = 960 mhz, vdd = 28 v, idq = 300 ma table 7. output power vs supply voltage freq = 960 mhz, vdd = 28 v, idq = 300 ma * $ , 1 g % 3 2 8 7 : d w w , g t p $ , g t p $ , g t p $ , g t p $ , g t p $ ! - v ! - v % & & ) # ) % . # 9 ' a i n d " 0 / 5 4 7 ' a i n % & & ! - v 0 / 5 4 7 6 $ $ 6 o l t 0 ) . 7 0 ) . 7 0 ) . 7 0 ) . 7 0 ) . 7
test circuit let9045f 6/10 doc id 16592 rev 2 5 test circuit figure 5. test circuit table 8. let9045f components list item qty part number vendor description r1, r2 2 cr1206-8w-112jb venkel 1.1 k ? 1/8w surface mount chip resistor r3 1 cr1206-8w-100jb venkel 10 ? 1/8w surface mo unt chip resistor coil 2 belden inductor 5 turns air wound#20awg id =0.130 in (3.3 mm) bylon coated b1,b2,b 3,b4,b5 5 2743021447 fair-rite corp surface mount emi sheild bead c1,c7, c8 3 t491d106k035at kemet 10 f 35 v tantalum capacitors c2 1 100 f 63 v electrolytic capacitor c3, c4, c10, c15 4 atc100b470xxxx atc 47 pf chip capacitor c5, c6 2 atc200b393mw atc 39000 pf chip capacitor c9 1 330 uf 50 v electrolytic capacitor c11, c13, c14 3 27291pc johanson 0.8-8 pf giga trim variable capacitor c12 1 atc100b110xxxx atc 11 pf chip capacitor tl1 l = 1.350in [34.29 mm] w = 0.082in [02.08 mm] tl2 l = 0.144in [3.65 mm] w = 0.082in [02.08 mm] tl3 l = 0.311in [7.91 mm] w = 0.082in [02.08 mm] tl4 l = 00.82in [2.09 mm] w = 0.323in [08.21 mm] tl5 l = 0.194 in [4.94 mm] w = 0.323in [08.21 mm] " " # , 2 2 2 # # 6 ' ' " " " # # # # 6 $ $ # # 4 , 4 , 4 , 4 , 4 , 4 , 4 , 4 , 4 , 4 , 4 , 4 , # # # # # # , / u t p u t ) n p u t ! - v
let9045f test circuit doc id 16592 rev 2 7/10 figure 6. circuit layout item qty part number vendor description tl6 l = 0.059in [1.49 mm] w= 0.506in [12.85 mm] tl7 l = 0.144in [3.65 mm] w = 0.506in [12.85 mm] tl8 l = 0.208in [5.28 mm] w = 0.506in [12.85 mm] tl9 l = 0.275in [6.98 mm] w = 0.323in [08.21 mm] tl10 l = 0.210in [5.33 mm] w = 0.082in [02.08 mm] tl11 l = 0.260in [6.60 mm] w = 0.082in [02.08 mm] tl12 l = 1.350in [34.29 mm] w = 0.082in [02.08 mm] board 3x5 1 rogers corp er=2.55 t=0.0026in h=0.030in table 8. let9045f components list (continued) + + + + +
package mechanical data let9045f 8/10 doc id 16592 rev 2 6 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. figure 7. package dimensions table 9. m250 (.230 x .360 2l n/herm w/flg) mechanical data dim. mm. inch min typ max min typ max a 5.21 5.71 0.205 0.225 b 2.16 2.92 0.085 0.115 c 5.59 6.09 0.220 0.240 d 8.89 9.40 0.350 0.370 e 9.40 9.91 0.370 0.390 f 0.11 0.15 0.004 0.006 g 0.89 1.14 0.035 0.045 h 1.45 1.70 0.057 0.067 i 2.67 3.94 0.105 0.155
let9045f revision history doc id 16592 rev 2 9/10 7 revision history table 10. document revision history date revision changes 02-nov-2009 1 initial release. 11-feb-2010 2 changed test condition for v (br)dss in table 4: static .
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