LD2985AM50R STMicroelectronics, LD2985AM50R Datasheet
LD2985AM50R
Specifications of LD2985AM50R
Available stocks
Related parts for LD2985AM50R
LD2985AM50R Summary of contents
Page 1
Very low drop and low noise voltage regulator low ESR Features ■ Very low dropout voltage (280 mV at 150 mA and load) ■ Very low quiescent current (2 mA typ. at 150 mA load ...
Page 2
Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 3
Diagram 1 Figure 1. Schematic diagram 3/21 ...
Page 4
Pin configuration Figure 2. Pin connections (top view) Table 2. Pin description Pin n° Symbol 1 IN Input port 2 GND Ground pin Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating. 3 INHIBIT Disable ...
Page 5
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 ...
Page 6
Electrical characteristics Table 5. Electrical characteristics for LD2985A ( µF, unless otherwise specified Symbol Parameter V Operating input voltage OP V Output voltage O V Output voltage O V Output voltage ...
Page 7
Table 5. Electrical characteristics for LD2985A (continued SHDN I Symbol Parameter V Output voltage O V Output voltage O V Output voltage O V Output voltage O I Short circuit current SC ...
Page 8
Table 5. Electrical characteristics for LD2985A (continued SHDN I Symbol Parameter V Control input logic high IH I Control input current INH e Output noise voltage N Table 6. Electrical characteristics for ...
Page 9
Table 6. Electrical characteristics for LD2985B (continued SHDN I Symbol Parameter V Output voltage O V Output voltage O V Output voltage O V Output voltage O V Output voltage O V ...
Page 10
Table 6. Electrical characteristics for LD2985B (continued SHDN I Symbol Parameter Quiescent current ON MODE I Q OFF MODE SVR Supply voltage rejection V Inhibit input logic low IL V Inhibit input ...
Page 11
Typical characteristics ( ° otherwise specified). Figure 3. Output voltage vs temperature Figure 5. Dropout voltage vs output current Figure 7. Quiescent current vs temperature + µF(X7R), C ...
Page 12
Figure 9. Supply voltage rejection vs output current Figure 11. Supply voltage rejection vs frequency Figure 13. Line transient V = 2.5V 50mA 4.7µ 12/21 Figure 10. Supply ...
Page 13
Figure 15. Load transient V = 2.5V 50mA 10µ Figure 16. Load transient V = 2.5V 50mA =2ns O ...
Page 14
Application notes 6.1 External capacitors Like any low-dropout regulator, the LD2985 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 ...
Page 15
Reverse current The power transistor used in the LD2985 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 ...
Page 16
Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: ECOPACK® ...
Page 17
SOT23-5L mechanical data mm. Dim. Min. Typ. A 0.90 A1 0.00 A2 0.90 b 0.35 C 0.09 D 2.80 E 1.50 e 0.95 H 2.60 L 0.10 mils. Max. Min. Typ. 1.45 35.4 0.10 0.0 1.30 35.4 0.50 13.7 0.20 ...
Page 18
Tape & reel SOT23-xL mechanical data Dim. Min 12 3.13 Bo 3.07 Ko 1.27 Po 3.9 P 3.9 18/21 mm. Typ. Max. Min. 180 13.0 13.2 0.504 0.795 2.362 14.4 3.23 3.33 ...
Page 19
... Order codes Table 7. Order codes A version LD2985AM18R LD2985AM25R LD2985AM28R LD2985AM30R LD2985AM33R LD2985AM50R B version LD2985BM18R LD2985BM25R LD2985BM27R LD2985BM28R LD2985BM30R LD2985BM33R LD2985BM50R Output voltages 1.8 V 2.5 V 2.7 V 2.8 V 3.0 V 3.3 V 5.0 V 19/21 ...
Page 20
Revision history Table 8. Document revision history Date Revision 22-Aug-2005 4 02-Sep-2005 5 25-Jul-2006 6 13-Feb-2008 7 04-Mar-2008 8 10-Jul-2008 9 27-Aug-2008 10 27-Jan-2009 11 20/21 Changes Add new value V ==> 2 tables 5 and 6. ...
Page 21
... 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 terms and conditions of sale. ...