ST LD2979xx Very low drop voltage regulators with inhibit handbook
Contents
1. Figure 3 Output voltage vs temperature Figure 4 Output voltage vs input voltage GC76680 GC76690 Vout VY Vour V 5 2 7 5 1 6 5 0 5 4 9 4 50mA LOAD 4 8 uev 3 4 7 2 000 4 6 1 25 C 4 5 0 60 40 20 0 20 40 60 80 Ta C 0 2 14 Vin V Figure 5 Output voltage vs input voltage Figure 6 Dropout voltage vs output current GC76700 GC76710 Vout V Va mV 7 200 6 n 150 4 RL 1000 RL 47000 3 100 2 50 1 Te 25 C D 0 2 3 4 5 6 7 Vw V 0 10 out MA Figure 7 Dropout voltage vs temperature Figure 8 Quiescent current vs temperature GC76720 GC76730 Va mV la uA 350 700 Vin 6V 300 600 250 500 200 400 150 300 100 200 50 100 1mA LOA 0 0 60 40 20 0 20 40 60 80 Ta C 60 40 20 80 Ta C 8 15 4 LD2979xx Typical characteristics Figure 9 Short circuit current vs dropout Figure 10 Inhibit voltage vs temperature voltage GC76740 6C76770 Isc A Vian LY 5 5 400 3 0 2 5 300 2 0 208 1 5 TEH 1 0 100 ET Vin 6V a 25 C 0 5 tmA LOAD 0 0 5 10 15 Va V 60 40 20 0 20 40 60 80 Ta C Figure 11 Supply voltage rejection vs Figure 12 Load transient response freq2. Ay LD2979xx Very low drop voltage regulators with inhibit Features m Very low dropout voltage 0 2 V typ at 50 mA load m Very low quiescent current typ 500 pA at 50 mA load Output current up to 50 mA Logic controlled electronic shutdown Output voltages of 3 0 3 3 3 8 5 0 V Internal current and thermal limit SOT23 5L Supply voltage rejection 63 dB typ Only 1 pF for stability Selection at 25 C Temperature range 25 C to 125 C Package available SOT23 5L Description The LD2979 series are very low drop regulators available in SOT23 5L The very 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 five pin version 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 Table 1 Device summary Part numbers Order codes Output voltages LD2979XX30 LD2979M30TR 3 0 V LD2979XX33 LD2979M33TR 3 3 V LD2979XX38 LD2979M38TR 3 8 V LD2979XX50 LD2979M50TR 5 0V April 2008 Rev 14 1 15 www st com Contents LD2979xx Contents 1 Diagram un 5 PR R RR R RRR RTE RT 3 2 Pin configuration sss s son ra ROS teen a RR RR ROC RC 4 3 Maximum ratings acia anennerzsccauua a3 ee eu cha nae dra acd ad 5 4 El
3. 15 Package mechanical data LD2979xx SOT23 5L mechanical data mm mils Dim A A1 A2 b C D E e H L 0 10 0 60 3 9 23 6 f TN RUNE i T g lt L J p D ES sd E p de i T Li E 19 pe es E ba e e 7049676D lt a a pe 12 15 ky LD2979xx Package mechanical data Tape amp reel SOT23 xL mechanical data Note Drawing not in scale 13 15 Revision history LD2979xx 7 Revision history Table 5 Document revision history Date Revision Changes 15 Mar 2005 10 Add tape amp reel for TO 92 03 Jul 2006 11 Order codes updated 16 May 2007 12 Order codes updated 08 Jun 2007 13 Order codes updated 09 Apr 2008 14 Modified Table 1 on page 1 14 15 ky LD2979xx Please Read Carefully Information in this document is provided solely in connection with ST products STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections modifications or improvements to this document and the products and services described herein at any time without notice All ST products are sold pursuant to ST s
4. junction temperature range 25 to 125 C Note Absolute maximum ratings are those values beyond which damage to the device may occur Functional operation under these condition is not implied STA 5 15 Electrical characteristics LD2979xx 4 Electrical characteristics Table 4 Electrical characteristics for LD2979xx refer to the test circuits T 25 C Vin Vo NOM t1 V lo 1 mA ViNH 22V Co 1 UF unless otherwise specified Symbol Parameter Test conditions Min Typ Max Unit Vin 3 85 V 2 793 2 85 2 907 Vo Output voltage V lo 1 to 50mA T 25 to 125 C 2 736 2 964 Viu 24 V 2 940 3 3 060 Vo Output voltage V lo 1 to 50mA Ta4 25 to 125 C 2 880 3 120 Vin 4 3 V 3 284 3 3 3 366 Vo Output voltage V lo 1 to 50mA T 25 to 125 C 3 168 3 432 Vin 4 8 V 3 724 38 3 876 Vo Output voltage V lo 1 to 50mA T 25 to 125 C 3 648 3 952 Vin 6V 4 9 5 5 1 Vo Output voltage V lo 1 to 50mA T 25 to 125 C 4 8 5 2 lo Output current limit 100 mA Vin V N My 1V to 16V 1mA 0 028 AVo Line regulation SM 2 9e N IN Taz 25 to 125 C 0 064 lo 0 80 110 Quiescent current On lo 0 Ta 25 to 125 C 170 UA Mode lo 50mA 500 700 d lo 50mA T 25 to 125 C 1300 Quiescent current Off VinH lt 0 18 V 0 Mode VinH lt 0 18 V Ta 25 to 125 C 1 SVR Supply voltage r
5. INJURY DEATH OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ST PRODUCTS WHICH ARE NOT SPECIFIED AS AUTOMOTIVE GRADE MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK Resale of ST products with provisions different from the statements and or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever any liability of ST ST and the ST logo are trademarks or registered trademarks of ST in various countries Information in this document supersedes and replaces all information previously supplied The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners 2008 STMicroelectronics All rights reserved STMicroelectronics group of companies Australia Belgium Brazil Canada China Czech Republic Finland France Germany Hong Kong India Israel Italy Japan Malaysia Malta Morocco Singapore Spain Sweden Switzerland United Kingdom United States of America www st com 15 15 4
6. ectrical characteristics 0 000 cee 6 5 Typical characteristics eeeeeeeeessssess 8 6 Package mechanical data selllleeeeess 11 7 Revision history que rasa ai ui a Ou OR C RR Cn 4 Dn COR t 0 08D GO as 14 2 15 ky LD2979xx Diagram 1 Diagram Figure 1 Schematic diagram Vi Vo e e C e CURRENT LIMIT INHIBIT Rs START REFERENCE INHIBIT VOLTAGE e ERROR DRIVER AMPLIFIER e TERM PROTEC ap GND C07920 ky 3 15 Pin configuration LD2979xx 2 Pin configuration Figure 2 Pin connections top view SC12360 SOT23 5L Table 2 Pin description Symbol Name and function Pin number Vi Input voltage 1 GND Ground 2 INHIBIT Control switch ON OFF 3 NC Not to be connected 4 Vo Output voltage 5 1 Inhibit pin is not internally pulled up then it must not be left floating Connect to a positive voltage higher than 2 V to able the device 4 15 ky LD2979xx Maximum ratings 3 Maximum ratings Table 3 Absolute maximum ratings Symbol Parameter Value Unit VI DC input voltage 16 V ViNH DC inhibit input voltage Vin V lo Output current Internally limited Pp Power dissipation Internally limited Tera Storage temperature range 40 to 150 C Top Operating
7. ejection lo 50mA Cour 10uF f 120Hz 63 dB lo 0 6 12 lo 0 Taz 25 to 125 C 18 lo 1mA 30 60 lo 1mA T 25 to 125 C 90 Vg Dropout voltage mV lo 10mA 100 200 lo 10mA T 25 to 125 C 300 lo 50mA 200 400 lo 50mA T 25 to 125 C 600 Vi Inhibit input logic low Device Off Ta 25 to 125 C 0 18 V Vim Inhibit input logic high Device On T 25 to 125 C 2 V 6 15 ky LD2979xx Electrical characteristics Table 4 Electrical characteristics for LD2979xx continued refer to the test circuits T4 25 C Vin Vo NOM 1 V lo 1 mA ViNH 2 V Co 1 UF unless otherwise specified Symbol Parameter Test conditions Min Typ Max Unit Ving 20 V 0 1 li Inhibit input current UA ViNH 5V T 25 to 125 C 5 15 eN OVtput noise voltage BW 300Hz to 50kHz Co 10pF 160 uV RMS y 7 5 Typical characteristics LD2979xx 5 Typical characteristics unless otherwise specified Ta 25 C
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9. uency GC76750 SVR dB i i Vout f 30 CC MN 20mV DIV Vin 5V lout 1mA to 50mA Time 10us DIV Co 10pF ESR 1 at 1kHz 0 60 40 20 0 20 40 60 80 Ta C Figure 13 Inhibit current vs temperature Figure 14 Load transient response GC76760 li 4A 7 6 5 4 PEPPER EEE 2 lout Van 5V 20mA DIV 1mA LOAD a Ra T E i i i Vin 5V lout 50mA to 1mA Time 10us DIV Co 10pF ESR 1 at 1kHz 4 9 15 Typical characteristics LD2979xx Figure 15 Line transient response res a a Vin 200mV DIV Vout 5mV DIV Time 20us DIV Co 10pF ESR 1 at 1kHz 10 15 q LD2979xx Package mechanical data 6 Package mechanical data In order to meet environmental requirements ST offers these devices in ECOPACK9 packages These packages have a lead free second level interconnect The category of second Level Interconnect is marked on the package and on the inner box label in compliance with JEDEC Standard JESD97 The maximum ratings related to soldering conditions are also marked on the inner box label ECOPACK is an ST trademark ECOPACK specifications are available at www st com Ta 11
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ST LD2979xx Very low drop voltage regulators with inhibit handbook