LD2980 series very low drop voltage regulators with inhibit october 1998 n ultra low dropout voltage (0.12v typ. at 50ma load) n very low quiescent current (max 1 m a in off mode; typ. 375 m aat 50ma load) n output current up to 50 ma n logic-controlled electronic shutdown n output voltages of 2.85; 3.0; 3.2; 3.3; 3.8; 4.85; 5.0v n internal current and thermal limit n availablein 0.5% tollerance (at 25 o c, a version) n supply voltage rejection: 63db (typ) n only 1 m f for stability n temperature range: -40 to 125 o c n smallest package sot23-5l n fast dynamic response to line and load changes description the LD2980 series are very low drop regulators available in sot23-5l package. the ultra low drop-voltage and the very low quiescent current make them particularly suitable for low noise, low power applications and in battery powered systems. shutdown logic control function is available on pin n. 3 (ttl compatible). this means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. schematic diagram sot23-5l ? 1/10
absolute maximum rating symbol parameter value unit v in dc input voltage 16 v v inh inhbit input voltage 16 v i o output current internally limited ma p tot power dissipation internally limited mw t stg storage temperature range - 55 to 150 o c t op operating junction temperature range - 40 to 125 o c ordering numbers ab version c version output voltage LD2980abm28tr LD2980abm30tr LD2980abm32tr LD2980abm33tr LD2980abm38tr LD2980abm48tr LD2980abm50tr LD2980cm28tr LD2980cm30tr LD2980cm32tr LD2980cm33tr LD2980cm38tr LD2980cm48tr LD2980cm50tr 2.85 v 3.0 v 3.2 v 3.3 v 3.8 v 4.85 v 5.0 v application circuit sot23-5l symbol name and function pin number v in input voltage 1 gnd ground 2 inhibit control switch on/off(*) 3 nc not to be connected 4 v out output voltage 5 (*) disable the device when connected to gnd or to a positive voltage less than 0.18v connection diagram (top view) thermal data symbol parameter value unit r thj-case thermal resistance junction-case 81 o c/w LD2980 2/10
electrical characteristics for LD2980ab (refer to the test circuits, t j =25 o c, v in =v o(nom) +1, c o =1 m f, i o = 1ma, v inh = 2v, unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v in = 3.85 v 1LD2980 3/10
electrical characteristics for LD2980c (refer to the test circuits, t j =25 o c, v in =v o(nom) +1, c o =1 m f, i o = 1ma, v inh = 2v, unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v in = 3.85 v 1LD2980 4/10
output voltage vs temperature output voltage vs input voltage line regulation vs temperature output voltage vs input voltage dropout voltage vs temperature typical performance characteristics (unless otherwise specified t j =25 o c, c in =c out =1 m f) output voltage vs temperature LD2980 5/10
typical performance characteristics (continued) dropout voltage vs output current quiescent current vs output current s.v.r. vs temperature s.v.r. vs frequency s.v.r. vs output current quiescent current vs temperature LD2980 6/10
stability output voltage vs inhibit voltage inhibit current vs temperature supply voltage rejection at v out =5v typical performance characteristics (continued) reverse current vs reverse voltage supply voltage rejection at v out = 2.85v v in = 7.35 2.5v, i out = 50ma, f=1khz v in =9 2.5v, i out = 50ma, f=1khz LD2980 7/10
line transient response typical performance characteristics (continued) v cc = 5v, i out = 1 to 50ma, c out =10 m f, c in = 150nf (esr=1 w at 1khz) line transient response v cc = 5v, i out = 50 to 1ma, c out =10 m f, c in = 150nf (esr=1 w at 1khz) line transient response line transient response v cc = 4.75 to 5.25v, i out = 0.05a, c out =10 m f, c in = 150nf (esr=1 w at 1khz) v cc = 5.25 to 6.25v, i out = 0.05a, c out =10 m f, c in = 150nf (esr=1 w at 1khz) supply boltage rejection v out = 5v, v in = 6v, v inh =0to5v,c in =c out =1 m f (tant.) LD2980 8/10
dim. mm mils min. typ. max. min. typ. max. a 0.90 1.45 35.4 57.1 a1 0.00 0.15 0.0 5.9 a2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 c 0.09 0.20 3.5 7.8 d 2.80 3.00 110.2 118.1 e 2.60 3.00 102.3 118.1 e1 1.50 1.75 59.0 68.8 l 0.35 0.55 13.7 21.6 e 0.95 37.4 e1 1.9 74.8 sot23-5l mechanical data LD2980 9/10
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 1998 stmicroelectronics printed in italy all rights reserved stmicroelectronics group of companies australia - brazil - canada - china - france - germany - italy - japan - korea - malaysia - malta - mexico - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a. http://www.st.com . LD2980 10/10
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