1 dice/dwf specification ltc1629-pg polyphase, high efficiency, synchronous step-down switching regulator die cross reference order dice candidate part number below ltc finished part number ltc1629-pg ltc1629-pg information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ltc1629-pg dice ltc1629-pg dwf dice electrical test li its w t a = 25 c. v in = 15v, v run/ss = 5v unless otherwise noted. pad function 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. run/ss sense1 + sense1 eain pllfltr pllin phasmd i th sgnd v diffout v os v os + sense2 sense2 + 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. pgood tg2 sw2 boost2 bg2 pgnd intv cc extv cc bg1 v in boost1 sw1 tg1 clkout symbol parameter conditions min max units main control loop v eain regulated feedback voltage (note 1); i th voltage = 1.2v 0.792 0.808 v v sensemax maximum current sense threshold v sense1, 2 = 5v; 65 85 mv i ineain feedback current (note 1) 50 na v loadreg output voltage load regulation (note 1) measured in servo loop; i th voltage = 0.7v 0.5 % measured in servo loop; i th voltage = 2v 0.5 % v reflnreg reference voltage line regulation v in = 3.6v to 30v (note 1) 0.02 %/v v ovl output overvoltage threshold measured at v eain 0.84 0.88 v uvlo undervoltage lockout v in ramping down 3 4 v i q input dc supply current shutdown (note 4); v run/ss = 0v 40 a i run/ss soft-start charge current v run/ss = 1.9v 0.5 a 4 5 6 7 8 11 10 9 12 3 2 1 28 27 100 120 mils 26 13 14 15 16 17 24 22 25 23 21 21 19 20 18
2 ltc1629-pg dice/dfn specification lt/lt 0405 printed in usa ? linear technology corporation 2005 wafer level testing is performed per the indicated specifications for dice. considerable differences in performance can often b e observed for dice versus packaged units due to the influences of packaging and assembly on certain devices and/or parameters. please consult factory for more information on dice performance and lot qualifications via lot sampling test procedures. dice data sheet subject to change. please consult factory for current revision in production. i.d.no. 66-13-1351 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com dice electrical test li its w symbol parameter conditions min max units t a = 25 c. v in = 15v, v run/ss = 5v unless otherwise noted. v run/ss run/ss pin on threshold v run/ss rising 1.0 1.9 v v run/sslo run/ss pin latchoff arming v run/ss rising from 3v 4.5 v i scl run/ss discharge current soft short condition v eain = 0.5v; v run/ss = 4.5v 0.5 4 a i sdldo shutdown latch disable current v eain = 0.5v 5 a i sense total sense pins source current each channel; v sense1 , 2 ?= v sense1 + , 2 + = 0v 85 a df max maximum duty factor in dropout 98 % top gate transition time: tg1, 2 t r rise time c load = 3300pf 90 ns tg1, 2 t f fall time c load = 3300pf 90 ns bottom gate transition time: bg1, 2 t r rise time c load = 3300pf 90 ns bg1, 2 t f fall time c load = 3300pf 90 ns internal v cc regulator v intvcc internal v cc voltage 6v < v in < 30v; v extvcc = 4v 4.8 5.2 v v ldo int intv cc load regulation i cc = 0 to 20ma; v extvcc = 4v 1.0 % v ldo ext extv cc voltage drop i cc = 20ma; v extvcc = 5v; 240 mv v extvcc extv cc switchover voltage i cc = 20ma, extv cc ramping positive 4.5 v oscillator and phase-locked loop f nom nominal frequency v pllfltr = 1.2v 190 250 khz f low lowest frequency v pllfltr = 0v 120 160 khz f high highest frequency v pllfltr 2.4v 280 360 khz r relphs controller 2-controller 1 phase v phasmd = 0v, open 180 deg v phasmd = 5v 240 deg clkout phase (relative to controller 1) v phasmd = 0v 60 deg v phasmd = open 90 deg v phasmd = 5v 120 deg clk high clock high output voltage 4 v clk low clock low output voltage 0.2 v differential amplifier/op amp gain block a da gain differential amp mode 0.995 1.005 v/v cmrr da common mode rejection ratio differential amp mode; 0v < v cm < 5v 46 db pgood output v pgl pgood voltage low i pgood = 2ma 0.3 v i pgood pgood leakage current v pgood = 5v 1 a v pg pgood trip level, either controller v eain with respect to set output voltage v eain ramping negative 6 9.5 % v eain ramping positive 6 9.5 % note 1: the ltc1629-pg is tested in a feedback loop that servos v ith to a specified voltage and measures the resultant v eain .
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