STMICROELECTRONICS LD2979M38TR

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 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
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.
April 2008
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
Rev 14
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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
3/15
Pin configuration
LD2979xx
2
Pin configuration
Figure 2.
Pin connections (top view)
SOT23-5L
Table 2.
Pin description
Symbol
VI
Name and function
Pin number
Input voltage
1
Ground
2
Control switch ON/OFF (1)
3
NC
Not to be connected
4
VO
Output voltage
5
GND
INHIBIT
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
LD2979xx
Maximum ratings
3
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
VI
VINH
Note:
Parameter
Value
Unit
DC input voltage
16
V
DC inhibit input voltage
VIN
V
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
TSTG
Storage temperature range
-40 to 150
°C
TOP
Operating junction temperature range
-25 to 125
°C
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
Electrical characteristics
Table 4.
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 µF, unless otherwise specified).
Symbol
Parameter
VO
Output voltage
VO
Output voltage
VO
Output voltage
VO
Output voltage
VO
Output voltage
IO
Output current limit
ΔVO
Line regulation
Test conditions
Min.
Typ.
Max.
VIN = 3.85 V
2.793
2.85
2.907
IO = 1 to 50mA, Ta= -25 to 125°C
2.736
VIN = 4 V
2.940
IO = 1 to 50mA, Ta= -25 to 125°C
2.880
VIN = 4.3 V
3.234
IO = 1 to 50mA, Ta= -25 to 125°C
3.168
VIN = 4.8 V
3.724
IO = 1 to 50mA, Ta= -25 to 125°C
3.648
V
Id
3
Supply voltage rejection
3.3
V
3.8
VIN = 6 V
4.9
IO = 1 to 50mA, Ta= -25 to 125°C
4.8
3.952
5
5.1
V
5.2
100
mA
VIN = VO(NOM)+1V to 16V, IO = 1mA
0.028
Ta= -25 to 125°C
0.064
80
IO = 0, Ta= -25 to 125°C
110
µA
IO = 50mA
500
700
1300
VINH < 0.18 V
0
µA
VINH < 0.18 V, Ta= -25 to 125°C
1
IO = 50mA, COUT = 10μF, f = 120Hz
63
IO = 0
6
dB
12
18
30
IO = 1mA, Ta= -25 to 125°C
60
90
mV
IO = 10mA
100
200
300
IO = 50mA
200
400
IO = 50mA, Ta= -25 to 125°C
600
0.18
VIL
Inhibit input logic low
Device Off, Ta= -25 to 125°C
VIH
Inhibit input logic high
Device On, Ta= -25 to 125°C
%/VIN
170
IO = 10mA, Ta= -25 to 125°C
6/15
3.876
V
IO = 1mA
Dropout voltage
3.366
3.432
IO = 0, Ta= -25 to 125°C
Vd
3.060
3.120
IO = 50mA, Ta= -25 to 125°C
Quiescent current (Off
Mode)
SVR
2.964
V
IO = 0
Quiescent current (On
Mode)
Unit
2
V
V
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 µF, unless otherwise specified).
Parameter
Inhibit input current
Output noise voltage
(RMS)
Test conditions
Typ.
Max.
VINH = 0 V
0
-1
VINH = 5V, Ta= -25 to 125°C
5
15
BW= 300Hz to 50kHz, CO = 10µF
Min.
Unit
µA
160
µV
7/15
Typical characteristics
LD2979xx
5
Typical characteristics
Figure 3.
(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
Figure 9.
Typical characteristics
Short circuit current vs dropout
voltage
Figure 11. Supply voltage rejection vs
frequency
Figure 10. Inhibit voltage vs temperature
Figure 12. Load transient response
CO = 10µF (ESR = 1 at 1kHz)
Figure 13. Inhibit current vs temperature
Figure 14. Load transient response
CO = 10µF (ESR = 1 at 1kHz)
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Typical characteristics
Figure 15. Line transient response
CO = 10µF (ESR = 1 at 1kHz)
10/15
LD2979xx
LD2979xx
6
Package mechanical data
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 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.
11/15
Package mechanical data
LD2979xx
SOT23-5L mechanical data
mm.
mils.
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
0.90
1.45
35.4
57.1
A1
0.00
0.10
0.0
3.9
A2
0.90
1.30
35.4
51.2
b
0.35
0.50
13.7
19.7
C
0.09
0.20
3.5
7.8
D
2.80
3.00
110.2
118.1
E
1.50
1.75
59.0
68.8
e
0.95
37.4
H
2.60
3.00
102.3
118.1
L
0.10
0.60
3.9
23.6
7049676D
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LD2979xx
Package mechanical data
Tape & reel SOT23-xL mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
180
13.0
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Max.
0.504
0.512
14.4
0.519
0.567
Ao
3.13
3.23
3.33
0.123
0.127
0.131
Bo
3.07
3.17
3.27
0.120
0.124
0.128
Ko
1.27
1.37
1.47
0.050
0.054
0.0.58
Po
3.9
4.0
4.1
0.153
0.157
0.161
P
3.9
4.0
4.1
0.153
0.157
0.161
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Revision history
LD2979xx
7
Revision history
Table 5.
Document revision history
Date
Revision
15-Mar-2005
10
Add tape & 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.
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Changes
LD2979xx
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