unisonic technologies co., ltd ut4957 power mosfet www.unisonic.com.tw 1 of 4 copyright ? 2008 unisonic technologies co., ltd qw-r502-279.a p-channel enhancement mode power mosfet ? description the ut4957 uses advanced trench technology to provide excellent r ds(on) , low gate charge and operation with low gate voltages. this device is suitable fo r use as a load switch or in pwm applications. ? features * r ds(on) <24m ? @v gs =-10v * r ds(on) <36m ? @v gs =4.5v * low capacitance * low gate charge * fast switching capability * avalanche energy specified ? symbol (7) (8) d1 (4) g2 (2) g1 s1 (1) s2 (3) (5) (6) d2 lead-free: ut4957l halogen-free: ut4957g ? ordering information ordering number normal lead free halogen free package packing ut4957-s08-r ut4957l-s08-r UT4957G-S08-R sop-8 tape reel ut4957-s08-t ut4957l-s08-t ut4957g-s08-t sop-8 tube
ut4957 power mosfet unisonic technologies co., ltd 2 of 5 www.unisonic.com.tw qw-r502-279.a ? pin configuration
ut4957 power mosfet unisonic technologies co., ltd 3 of 5 www.unisonic.com.tw qw-r502-279.a ? absolute maximum ratings parameter symbol ratings unit drain-source voltage v dss -30 v gate-source voltage v gss 20 v continuous drain current i d -7.7 a pulsed drain current (note 2) i dm -30 a power dissipation t a =25c p d 2 w junction temperature t j +150 c storage temperature t stg -55 ~ +150 c note: 1. absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. 2. pulse width limited by t j(max) ? thermal data parameter symbol min typ max unit junction-to-ambient ja 62.5 c/w ? electrical characteristics (t j =25c, unless otherwise specified) parameter symbol test conditions min typ max unit off characteristics drain-source breakdown voltage bv dss v gs =0v, i d =-250a -30 v breakdown voltage temperature coefficient bv dss / t j reference to 25c, i d =-1ma -0.02 v/c drain-source leakage current i dss v ds =-30v, v gs =0v -1 a gate-source leakage current i gss v gs =20v, v ds =0v 100 na on characteristics gate threshold voltage v gs(th) v ds =v gs , i ds =-250a -1 -3 v v gs =-10v, i d =-7a 20 24 static drain-source on-resistance (note) r ds(on) v gs =4.5v, i d =-5a 30 36 m ? dynamic parameters input capacitance c iss 1670 2670 pf output capacitance c oss 530 pf reverse transfer capacitance c rss v ds =-25v, v gs =0v, f=1.0mhz 435 pf switching parameters turn-on delay time (note) t d(on) 14 ns turn-on rise time t r 11 ns turn-off delay time t d(off) 38 ns turn-off fall-time t f v ds =-15v, i d =-1a, v gs =-10v r g =3.3 ? , r d =15 ? 25 ns total gate charge (note) q g 27 45 nc gate source charge q gs 5 nc gate drain charge q gd v ds =-24v, v gs =-4.5v, i d =-7a 18 nc source- drain diode ratings and characteristics diode forward voltage v sd i s =-1.7a, v gs =0v -1.2 v body diode reverse recovery time t rr 35 ns body diode reverse recovery charge q rr i s =-7a, v gs =0v, di/dt=100a/ s 34 nc note: pulse width <300us , duty cycle <2%.
ut4957 power mosfet unisonic technologies co., ltd 4 of 5 www.unisonic.com.tw qw-r502-279.a ? typical characteristics drain current vs. gate threshold voltage gate threshold voltage, v th (v) drain current vs. drain-source breakdown voltage drain-source breakdown voltage, bv dss (v) 0 50 250 100 150 200 300 350 400 450 0 1.0 0.5 0 30 10 20 4 0 2.0 1.5 0 50 250 100 150 200 300 drain-source on-state resistance characteristics drain to source voltage, v ds (mv) 150 12 0 0 4 8 10 2 100 50 6 200 v gs =-10v, i d =-7a v gs =-5v, i d =-4.5a
ut4957 power mosfet unisonic technologies co., ltd 5 of 5 www.unisonic.com.tw qw-r502-279.a utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior writ ten consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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