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LD2979xx
Very low drop voltage regulators with inhibit
Features

Very low dropout voltage (0.2 V typ. at 50 mA load) Very low quiescent current (typ. 500 A 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 Supply voltage rejection: 63 dB (typ) Only 1 F for stability Selection at 25 C Temperature range: -25 C to 125 C Package available: SOT23-5L
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 LD2979XX30 LD2979XX33 LD2979XX38 LD2979XX50 Order codes LD2979M30TR LD2979M33TR LD2979M38TR LD2979M50TR Rev 14 Output voltages 3.0 V 3.3 V 3.8 V 5.0 V 1/15
www.st.com 15
April 2008
Contents
LD2979xx
Contents
1 2 3 4 5 6 7 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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LD2979xx
Diagram
1
Figure 1.
Diagram
Schematic diagram
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Pin configuration
LD2979xx
2
Figure 2.
Pin configuration
Pin connections (top view)
SOT23-5L
Table 2.
Pin description
Name and function Input voltage Ground Control switch ON/OFF (1) Not to be connected Output voltage Pin number 1 2 3 4 5
Symbol VI GND INHIBIT NC VO
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.
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LD2979xx
Maximum ratings
3
Table 3.
Maximum ratings
Absolute maximum ratings
Parameter DC input voltage DC inhibit input voltage Output current Power dissipation Storage temperature range Operating junction temperature range Value 16 VIN Internally limited Internally limited -40 to 150 -25 to 125 C C Unit V V
Symbol VI VINH IO PD TSTG TOP
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
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Electrical characteristics
LD2979xx
4
Table 4.
Symbol VO
Electrical characteristics
Electrical characteristics for LD2979xx (refer to the test circuits, Ta = 25 C, VIN = VO(NOM) + 1 V, IO = 1 mA, VINH = 2 V, CO = 1 F, unless otherwise specified).
Parameter Output voltage Test conditions VIN = 3.85 V IO = 1 to 50mA, Ta= -25 to 125C Output voltage VIN = 4 V IO = 1 to 50mA, Ta= -25 to 125C Output voltage VIN = 4.3 V IO = 1 to 50mA, Ta= -25 to 125C Output voltage VIN = 4.8 V IO = 1 to 50mA, Ta= -25 to 125C Output voltage Output current limit Line regulation VIN = VO(NOM)+1V to 16V, IO = 1mA Ta= -25 to 125C IO = 0 Quiescent current (On Mode) Id Quiescent current (Off Mode) SVR Supply voltage rejection IO = 0, Ta= -25 to 125C IO = 50mA IO = 50mA, Ta= -25 to 125C VINH < 0.18 V VINH < 0.18 V, Ta= -25 to 125C IO = 50mA, COUT = 10F, f = 120Hz IO = 0 IO = 0, Ta= -25 to 125C IO = 1mA Vd Dropout voltage IO = 1mA, Ta= -25 to 125C IO = 10mA IO = 10mA, Ta= -25 to 125C IO = 50mA IO = 50mA, Ta= -25 to 125C VIL VIH Inhibit input logic low Inhibit input logic high Device Off, Ta= -25 to 125C Device On, Ta= -25 to 125C 2 200 100 30 63 6 12 18 60 90 mV 200 300 400 600 0.18 V V 0 A 1 dB 500 80 VIN = 6 V IO = 1 to 50mA, Ta= -25 to 125C Min. 2.793 2.736 2.940 2.880 3.234 3.168 3.724 3.648 4.9 4.8 100 0.028 0.064 110 170 A 700 1300 %/VIN 5 3.8 3.3 3 Typ. 2.85 Max. 2.907 V 2.964 3.060 V 3.120 3.366 V 3.432 3.876 V 3.952 5.1 V 5.2 mA Unit
VO
VO
VO
VO IO VO
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LD2979xx Table 4.
Symbol II eN
Electrical characteristics Electrical characteristics for LD2979xx (continued) (refer to the test circuits, Ta = 25 C, VIN = VO(NOM) + 1 V, IO = 1 mA, VINH = 2 V, CO = 1 F, unless otherwise specified).
Parameter Test conditions VINH = 0 V VINH = 5V, Ta= -25 to 125C Min. Typ. 0 5 160 Max. -1 A 15 V Unit
Inhibit input current Output noise voltage (RMS)
BW= 300Hz to 50kHz, CO = 10F
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Typical characteristics
LD2979xx
5
Figure 3.
Typical characteristics
(unless otherwise specified TA = 25 C) Output voltage vs temperature Figure 4. Output voltage vs input voltage
Figure 5.
Output voltage vs input voltage
Figure 6.
Dropout voltage vs output current
Figure 7.
Dropout voltage vs temperature
Figure 8.
Quiescent current vs temperature
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LD2979xx
Typical characteristics
Figure 9.
Short circuit current vs dropout voltage
Figure 10. Inhibit voltage vs temperature
Figure 11. Supply voltage rejection vs frequency
Figure 12. Load transient response
CO = 10F (ESR = 1 at 1kHz)
Figure 13. Inhibit current vs temperature
Figure 14. Load transient response
CO = 10F (ESR = 1 at 1kHz)
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Typical characteristics
LD2979xx
Figure 15. Line transient response
CO = 10F (ESR = 1 at 1kHz)
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LD2979xx
Package mechanical data
6
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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.
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Package mechanical data
LD2979xx
SOT23-5L mechanical data
mm. Dim. Min. A A1 A2 b C D E e H L 2.60 0.10 0.90 0.00 0.90 0.35 0.09 2.80 1.50 0.95 3.00 0.60 102.3 3.9 Typ. Max. 1.45 0.10 1.30 0.50 0.20 3.00 1.75 Min. 35.4 0.0 35.4 13.7 3.5 110.2 59.0 37.4 118.1 23.6 Typ. Max. 57.1 3.9 51.2 19.7 7.8 118.1 68.8 mils.
7049676D
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LD2979xx
Package mechanical data
Tape & reel SOT23-xL mechanical data
mm. Dim. Min. A C D N T Ao Bo Ko Po P 3.13 3.07 1.27 3.9 3.9 3.23 3.17 1.37 4.0 4.0 12.8 20.2 60 14.4 3.33 3.27 1.47 4.1 4.1 0.123 0.120 0.050 0.153 0.153 0.127 0.124 0.054 0.157 0.157 13.0 Typ. Max. 180 13.2 0.504 0.795 2.362 0.567 0.131 0.128 0.0.58 0.161 0.161 0.512 Min. Typ. Max. 7.086 0.519 inch.
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Revision history
LD2979xx
7
Table 5.
Date
Revision history
Document revision history
Revision 10 11 12 13 14 Add tape & reel for TO-92. Order codes updated. Order codes updated. Order codes updated. Modified: Table 1 on page 1. Changes
15-Mar-2005 03-Jul-2006 16-May-2007 08-Jun-2007 09-Apr-2008
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LD2979xx
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