ST LD2979M30TR, LD2979M33TR, LD2979M38TR, LD2979M50TR User Manual
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 µA 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 µF for stability
■ Selection at 25 °C
■ Temperature range: -25 °C to 125 °C
■ Package available: SOT23-5L
LD2979xx
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 5.0 V
April 2008 Rev 14 1/15
www.st.com
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Contents LD2979xx
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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LD2979xx Diagram
1 Diagram
Figure 1. Schematic diagram
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Pin configuration LD2979xx
2 Pin configuration
Figure 2. Pin connections (top view)
SOT23-5L
Table 2. Pin description
Symbol Name and function Pin number
V
I
Input voltage 1
GND Ground 2
INHIBIT Control switch ON/OFF
(1)
3
NC Not to be connected 4
V
O
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.
Output voltage 5
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LD2979xx Maximum ratings
3 Maximum ratings
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
DC input voltage 16 V
DC inhibit input voltage V
IN
Output current Internally limited
Power dissipation Internally limited
Storage temperature range -40 to 150 °C
Operating junction temperature range -25 to 125 °C
V
V
T
P
STG
T
V
INH
I
O
OP
I
D
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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