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www.irf.com 1 05/23/07 IRF7821 hexfet power mosfet notes through are on page 10 benefits very low r ds(on) at 4.5v v gs low gate charge fully characterized avalanche voltage and current applications high frequency point-of-load synchronous buck converter for applications in networking & computing systems. top view 8 1 2 3 4 5 6 7 d d d d g s a s s a so-8 v dss r ds(on) max q g (typ.) 30v 9.1m @v gs = 10v 9.3nc absolute maximum ratings parameter units v ds drain-to-source voltage v v gs gate-to-source voltage i d @ t a = 25c continuous drain current, v gs @ 10v i d @ t a = 70c continuous drain current, v gs @ 10v a i dm pulsed drain current p d @t a = 25c power dissipation w p d @t a = 70c power dissipation linear derating factor w/c t j operating junction and c t stg storage temperature range thermal resistance parameter typ. max. units r jl junction-to-drain lead ??? 20 c/w r ja junction-to-ambient ??? 50 -55 to + 155 2.5 0.02 1.6 max. 13.6 11 100 20 30
2 www.irf.com static @ t j = 25c (unless otherwise specified) parameter min. t y p. max. units bv dss drain-to-source breakdown voltage 30 ??? ??? v ? v dss / ? t j breakdown voltage temp. coefficient ??? 0.025 ??? v/c r ds(on) static drain-to-source on-resistance ??? 7.0 9.1 m ? ??? 9.5 12.5 v gs(th) gate threshold voltage 1.0 ??? ??? v ? v gs(th) gate threshold voltage coefficient ??? - 4.9 ??? mv/c i dss drain-to-source leakage current ??? ??? 1.0 a ??? ??? 150 i gss gate-to-source forward leakage ??? ??? 100 na gate-to-source reverse leakage ??? ??? -100 gfs forward transconductance 22 ??? ??? s q g total gate charge ??? 9.3 14 q gs1 pre-vth gate-to-source charge ??? 2.5 ??? q gs2 post-vth gate-to-source charge ??? 0.8 ??? nc q gd gate-to-drain charge ??? 2.9 ??? q godr gate charge overdrive ??? 3.1 ??? see fig. 16 q sw switch char g e (q gs2 + q gd ) ??? 3.7 ??? q oss output charge ??? 6.1 ??? nc t d(on) turn-on delay time ??? 6.3 ??? t r rise time ??? 2.7 ??? t d(off) turn-off delay time ??? 9.7 ??? ns t f fall time ??? 7.3 ??? c iss input capacitance ??? 1010 ??? c oss output capacitance ??? 360 ??? pf c rss reverse transfer capacitance ??? 110 ??? avalanche characteristics parameter units e as si n gl e p u l se a va l anc h e e ner gy mj i ar a va l anc h e c urrent a diode characteristics parameter min. t y p. max. units i s continuous source current ??? ??? 3.1 (body diode) a i sm pulsed source current ??? ??? 100 (body diode) v sd diode forward voltage ??? ??? 1.0 v t rr reverse recovery time ??? 28 42 ns q rr reverse recovery charge ??? 23 35 nc ??? i d = 10a v gs = 0v v ds = 15v v gs = 4.5v, i d = 10a v gs = 4.5v typ. ??? v ds = v gs , i d = 250a clamped inductive load v ds = 15v, i d = 10a t j = 25c, i f = 10a, v dd = 20v di/dt = 100a/s t j = 25c, i s = 10a, v gs = 0v showing the integral reverse p-n junction diode. mosfet symbol v ds = 10v, v gs = 0v v dd = 15v, v gs = 4.5v i d = 10a v ds = 15v v gs = 20v v gs = -20v v ds = 24v, v gs = 0v v ds = 24v, v gs = 0v, t j = 125c conditions v gs = 0v, i d = 250a reference to 25c, i d = 1ma v gs = 10v, i d = 13a conditions max. 44 10 ? = 1.0mhz
www.irf.com 3 fig 4. normalized on-resistance vs. temperature fig 2. typical output characteristics fig 1. typical output characteristics fig 3. typical transfer characteristics 2.0 3.0 4.0 5.0 6.0 v gs , gate-to-source voltage (v) 0.1 1.0 10.0 100.0 i d , d r a i n - t o - s o u r c e c u r r e n t ( ) t j = 25c t j = 150c v ds = 15v 20s pulse width -60 -40 -20 0 20 40 60 80 100 120 140 160 t j , junction temperature (c) 0.5 1.0 1.5 2.0 r d s ( o n ) , d r a i n - t o - s o u r c e o n r e s i s t a n c e ( n o r m a l i z e d ) i d = 13a v gs = 10v 0.1 1 10 100 v ds , drain-to-source voltage (v) 0.1 1 10 100 i d , d r a i n - t o - s o u r c e c u r r e n t ( a ) 2.5v 20s pulse width tj = 25c vgs top 10v 4.5v 3.7v 3.5v 3.3v 3.0v 2.7v bottom 2.5v 0.1 1 10 100 v ds , drain-to-source voltage (v) 1 10 100 i d , d r a i n - t o - s o u r c e c u r r e n t ( a ) 2.5v 20s pulse width tj = 150c vgs top 10v 4.5v 3.7v 3.5v 3.3v 3.0v 2.7v bottom 2.5v
4 www.irf.com fig 8. maximum safe operating area fig 6. typical gate charge vs. gate-to-source voltage fig 5. typical capacitance vs. drain-to-source voltage fig 7. typical source-drain diode forward voltage 1 10 100 v ds , drain-to-source voltage (v) 10 100 1000 10000 c , c a p a c i t a n c e ( p f ) coss crss ciss v gs = 0v, f = 1 mhz c iss = c gs + c gd , c ds shorted c rss = c gd c oss = c ds + c gd 0 5 10 15 20 q g total gate charge (nc) 0 2 4 6 8 10 12 v g s , g a t e - t o - s o u r c e v o l t a g e ( v ) v ds = 24v vds= 15v i d = 10a 0.0 0.5 1.0 1.5 v sd , source-todrain voltage (v) 0.1 1.0 10.0 100.0 i s d , r e v e r s e d r a i n c u r r e n t ( a ) t j = 25c t j = 150c v gs = 0v 0.1 1.0 10.0 100.0 1000.0 v ds , drain-tosource voltage (v) 0.1 1 10 100 1000 i d , d r a i n - t o - s o u r c e c u r r e n t ( a ) tc = 25c tj = 150c single pulse 1msec 10msec operation in this area limited by r ds (on) 100sec
www.irf.com 5 fig 11. maximum effective transient thermal impedance, junction-to-ambient fig 9. maximum drain current vs. case temperature fig 10. threshold voltage vs. temperature -75 -50 -25 0 25 50 75 100 125 150 t j , temperature ( c ) 1.0 1.4 1.8 2.2 2.6 v g s ( t h ) g a t e t h r e s h o l d v o l t a g e ( v ) i d = 250a 1e-006 1e-005 0.0001 0.001 0.01 0.1 1 10 100 t 1 , rectangular pulse duration (sec) 0.01 0.1 1 10 100 t h e r m a l r e s p o n s e ( z t h j a ) 0.20 0.10 d = 0.50 0.02 0.01 0.05 single pulse ( thermal response ) 25 50 75 100 125 150 t j , junction temperature (c) 0 2 4 6 8 10 12 14 i d , d r a i n c u r r e n t ( a )
6 www.irf.com fig 13b. unclamped inductive waveforms fig 13a. unclamped inductive test circuit t p v (br)dss i as fig 13c. maximum avalanche energy vs. drain current r g i as 0.01 ? t p d.u.t l v ds + - v dd driver a 15v 20v v gs 25 50 75 100 125 150 starting t j , junction temperature (c) 0 20 40 60 80 100 e a s , s i n g l e p u l s e a v a l a n c h e e n e r g y ( m j ) i d top 4.5a 8.0a bottom 10a fig 14a. switching time test circuit fig 14b. switching time waveforms v gs v ds 90% 10% t d(on) t d(off) t f t r v gs pulse width < 1s duty factor < 0.1% v dd v ds l d d.u.t fig 12. on-resistance vs. gate voltage 2.0 4.0 6.0 8.0 10.0 v gs , gate-to-source voltage (v) 0 5 10 15 20 25 30 r d s ( o n ) , d r a i n - t o - s o u r c e o n r e s i s t a n c e ( m ? ) t j = 25c t j = 125c i d = 13a
www.irf.com 7 d.u.t. v ds i d i g 3ma v gs .3 f 50k ? .2 f 12v current regulator same type as d.u.t. current sampling resistors + - fig 16. gate charge test circuit fig 15.

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? ? p.w. period di/dt diode recovery dv/dt ripple 5% body diode forward drop re-applied voltage reverse recovery current body diode forward current v gs =10v v dd i sd driver gate drive d.u.t. i sd waveform d.u.t. v ds waveform inductor curent d = p. w . period

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#' p loss = p conduction + p switching + p drive + p output this can be expanded and approximated by; p loss = i rms 2 r ds(on ) () + i q gd i g v in f ? ? ? ? ? ? + i q gs 2 i g v in f ? ? ? ? ? ? + q g v g f () + q oss 2 v in f ? ? ? ? " (

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synchronous fet the power loss equation for q2 is approximated by; p loss = p conduction + p drive + p output * p loss = i rms 2 r ds(on) () + q g v g f () + q oss 2 v in f ? ? ? ? ? + q rr v in f ( ) *dissipated primarily in q1. for the synchronous mosfet q2, r ds(on) is an im- portant characteristic; however, once again the im- portance of gate charge must not be overlooked since it impacts three critical areas. under light load the mosfet must still be turned on and off by the con- trol ic so the gate drive losses become much more significant. secondly, the output charge q oss and re- verse recovery charge q rr both generate losses that are transfered to q1 and increase the dissipation in that device. thirdly, gate charge will impact the mosfets? susceptibility to cdv/dt turn on. the drain of q2 is connected to the switching node of the converter and therefore sees transitions be- tween ground and v in . as q1 turns on and off there is a rate of change of drain voltage dv/dt which is ca- pacitively coupled to the gate of q2 and can induce a voltage spike on the gate that is sufficient to turn the mosfet on, resulting in shoot-through current . the ratio of q gd /q gs1 must be minimized to reduce the potential for cdv/dt turn on. power mosfet selection for non-isolated dc/dc converters figure a: q oss characteristic
www.irf.com 9 so-8 package details so-8 part marking

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repetitive rating; pulse width limited by max. junction temperature. starting t j = 25c, l = 0.87mh r g = 25 ? , i as = 10a. pulse width 400s; duty cycle 2%. when mounted on 1 inch square copper board
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data and specifications subject to change without notice. this product has been designed and qualified for the industrial market. qualification standards can be found on ir?s web site. ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 tac fax: (310) 252-7903 visit us at www.irf.com for sales contact information . 05/2007 330.00 (12.992) max. 14.40 ( .566 ) 12.40 ( .488 ) notes : 1. controlling dimension : millimeter. 2. outline conforms to eia-481 & eia-541. feed direction terminal number 1 12.3 ( .484 ) 11.7 ( .461 ) 8.1 ( .318 ) 7.9 ( .312 ) notes: 1. controlling dimension : millimeter. 2. all dimensions are shown in millimeters(inches). 3. outline conforms to eia-481 & eia-541. so-8 tape and reel note: for the most current drawing please refer to ir website at http://www.irf.com/package/pkhexfet.html

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