LD2981ABU33TR STMicroelectronics, LD2981ABU33TR Datasheet
LD2981ABU33TR
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LD2981ABU33TR Summary of contents
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Features ■ Stable with low ESR ceramic capacitors ■ Ultra low dropout voltage (0.17 V typ. at 100 mA load typ load) ■ Very low quiescent current (80 µA typ load in on ...
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Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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Diagram 1 Figure 1. Schematic diagram 3/23 ...
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Pin configuration Figure 2. Pin connections (top view) SOT23-5L Table 2. Pin description Pin n° Pin n° Symbol SOT23-5L SOT- INHIBIT Table 3. Thermal data Symbol Parameter R Thermal resistance ...
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Maximum ratings Table 4. Absolute maximum ratings Symbol V DC input voltage I V INHIBIT input voltage INH I Output current O P Power dissipation D T Storage temperature range STG T Operating junction temperature range OP Note: Absolute ...
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Typical application Figure 3. Application circuit Note: Inhibit pin is not internally pulled-up then it must not be left floating. Disable the device when connected to GND positive voltage less than 0.18 V. 6/23 ...
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Electrical characteristics Table 5. Electrical characteristics for LD2981AB ( 2.2 µF (X7R Symbol Parameter V Operating input voltage OP V Output voltage O V Output voltage O V Output voltage O V Output voltage O ...
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Table 5. Electrical characteristics for LD2981AB (continued µF (X7R 2.2 µF (X7R Symbol Parameter Quiescent current ON MODE I Q OFF MODE (1) V Dropout voltage DROP I Short circuit current SC SVR Supply ...
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Table 6. Electrical characteristics for LD2981C ( 2.2 µF (X7R Symbol Parameter V Operating input voltage OP V Output voltage O V Output voltage O V Output voltage O V Output voltage O V Output voltage ...
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Table 6. Electrical characteristics for LD2981C (continued) (T µF (X7R 2.2 µF (X7R Symbol Parameter V Output voltage O ΔV Line regulation O Quiescent current ON MODE I Q OFF MODE (1) V Dropout voltage DROP ...
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Typical performance characteristics ( ° otherwise specified). Figure 4. Output voltage vs temperature Figure 6. Line regulation vs temperature Figure 8. Dropout voltage vs temperature + µF (X7R), ...
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Figure 10. Quiescent current vs output current Figure 12. Quiescent current vs input voltage Figure 13. Dropout voltage vs output current Figure 14. Inhibit input current vs temperature Figure 15. Inhibit voltage vs temperature 12/23 Figure 11. Off mode quiescent ...
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Figure 16. Supply voltage rejection vs frequency Figure 18. Best case: highest output version Figure 20. Load transient response V = 4.7V 100mA 4.7µF (X7R Figure 17. Noise voltage vs frequency ...
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Application notes 7.1 External capacitors Like any low-dropout regulator, the LD2981 requires external capacitors for regulator stability. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. We suggest to solder input and ...
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Reverse current The power transistor used in the LD2981 has not an inherent diode connected between the regulator input and output. If the output is forced above the input, no current will flow from the output to the input ...
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Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK 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 ...
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SOT-89 mechanical data mm. Dim. Min. Typ. A 1.4 B 0.44 B1 0.36 C 0.35 C1 0.35 D 4.4 D1 1.62 E 2.29 e 1.42 e1 2.92 H 3.94 L 0.89 mils. Max. Min. Typ. 1.6 55.1 0.56 17.3 0.48 ...
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Dim. Min. A 0.90 A1 0.00 A2 0.90 b 0.35 C 0.09 D 2. 2.60 L 0.10 18/23 SOT23-5L mechanical data mm. Typ. Max. 1.45 0.10 1.30 0.50 0.20 3.00 1.75 0.95 3.00 0.60 mils. Min. ...
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Tape & reel SOT23-xL mechanical data mm. Dim. Min. Typ 12.8 13 3.13 3.23 Bo 3.07 3.17 Ko 1.27 1.37 Po 3.9 4.0 P 3.9 4.0 inch. Max. Min. Typ. 180 13.2 ...
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Tape & reel SOT-89 mechanical data Dim. Min 12 4.70 Bo 4.30 Ko 1.70 Po 3.9 P 7.9 20/23 mm. Typ. Max. Min. 180 13.0 13.2 0.504 0.795 2.362 14.4 4.80 4.90 ...
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... Order codes Table 7. Order codes AB Version SOT23-5L SOT-89 LD2981ABM25TR LD2981ABU25TR LD2981ABM30TR LD2981ABU30TR LD2981ABM33TR LD2981ABU33TR LD2981ABM50TR LD2981ABU50TR 1. Available on request. C Version SOT23-5L SOT-89 (1) LD2981CU25TR (1) LD2981CM30TR LD2981CU30TR LD2981CM33TR LD2981CU33TR LD2981CM50TR LD2981CU50TR Output voltage (1) 2.5 V (1) 3.0 V 3.3 V 5.0 V 21/23 ...
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Revision history Table 8. Document revision history Date Revision 25-Jul-2006 12 14-Feb-2008 13 14-Jul-2008 14 22/23 Changes Order codes updated. Added: Table 1 on page 1. Modified: Table 1 on page 1 and Table 7 on page 21. ...
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