LD2979M50TR [STMICROELECTRONICS]
Very low drop voltage regulators with inhibit; 非常低压降稳压器与抑制
| 型号： | LD2979M50TR |
| 厂家： | 
ST |
| 描述： | Very low drop voltage regulators with inhibit |
| 文件： | 总15页 (文件大小：299K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
SOT23-5L
■ Selection at 25 °C
■ Temperature range: -25 °C to 125 °C
■ Package available: 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
LD2979XX33
LD2979XX38
LD2979XX50
LD2979M30TR
LD2979M33TR
LD2979M38TR
LD2979M50TR
3.0 V
3.3 V
3.8 V
5.0 V
April 2008
Rev 14
1/15
www.st.com
15
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
2/15
LD2979xx
1
Diagram
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
Ground
1
2
3
4
5
GND
INHIBIT
NC
Control switch ON/OFF (1)
Not to be connected
Output voltage
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.
4/15
LD2979xx
3
Maximum ratings
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
VI
VINH
IO
DC input voltage
16
V
V
DC inhibit input voltage
Output current
VIN
Internally limited
Internally limited
-40 to 150
PD
Power dissipation
TSTG
TOP
Storage temperature range
Operating junction temperature range
°C
°C
-25 to 125
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
5/15
Electrical characteristics
LD2979xx
4
Electrical characteristics
Table 4.
Electrical characteristics for LD2979xx (refer to the test circuits, T = 25 °C,
a
V
= V
+ 1 V, I = 1 mA, V
= 2 V, C = 1 µF, unless otherwise specified).
INH O
IN
O(NOM)
O
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VIN = 3.85 V
2.793
2.736
2.940
2.880
3.234
3.168
3.724
3.648
4.9
2.85
2.907
2.964
3.060
3.120
3.366
3.432
3.876
3.952
5.1
VO
Output voltage
Output voltage
Output voltage
Output voltage
V
IO = 1 to 50mA, Ta= -25 to 125°C
IN = 4 V
IO = 1 to 50mA, Ta= -25 to 125°C
IN = 4.3 V
V
3
VO
VO
VO
V
V
V
V
3.3
3.8
5
IO = 1 to 50mA, Ta= -25 to 125°C
VIN = 4.8 V
IO = 1 to 50mA, Ta= -25 to 125°C
VIN = 6 V
VO
IO
Output voltage
V
IO = 1 to 50mA, Ta= -25 to 125°C
4.8
5.2
Output current limit
Line regulation
100
mA
VIN = VO(NOM)+1V to 16V, IO = 1mA
0.028
0.064
110
ΔVO
%/VIN
Ta= -25 to 125°C
IO = 0
80
500
0
I
O = 0, Ta= -25 to 125°C
O = 50mA
170
Quiescent current (On
Mode)
µA
I
700
Id
IO = 50mA, Ta= -25 to 125°C
VINH < 0.18 V
1300
Quiescent current (Off
Mode)
µA
dB
VINH < 0.18 V, Ta= -25 to 125°C
IO = 50mA, COUT = 10μF, f = 120Hz
IO = 0
1
SVR Supply voltage rejection
63
6
12
18
IO = 0, Ta= -25 to 125°C
IO = 1mA
30
60
IO = 1mA, Ta= -25 to 125°C
90
Vd
Dropout voltage
mV
IO = 10mA
100
200
200
300
400
600
0.18
IO = 10mA, Ta= -25 to 125°C
IO = 50mA
IO = 50mA, Ta= -25 to 125°C
VIL
VIH
Inhibit input logic low
Inhibit input logic high
Device Off, Ta= -25 to 125°C
Device On, Ta= -25 to 125°C
V
V
2
6/15
LD2979xx
Table 4.
Electrical characteristics
Electrical characteristics for LD2979xx (continued) (refer to the test circuits, T = 25 °C,
a
V
= V
+ 1 V, I = 1 mA, V
= 2 V, C = 1 µF, unless otherwise specified).
INH O
IN
O(NOM)
O
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
V
INH = 0 V
0
5
-1
II
Inhibit input current
µA
VINH = 5V, Ta= -25 to 125°C
15
Output noise voltage
(RMS)
eN
BW= 300Hz to 50kHz, CO = 10µF
160
µV
7/15
Typical characteristics
LD2979xx
5
Typical characteristics
(unless otherwise specified T = 25 °C)
A
Figure 3.
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
8/15
LD2979xx
Figure 9.
Typical characteristics
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 = 10µF (ESR = 1 at 1kHz)
Figure 13. Inhibit current vs temperature
Figure 14. Load transient response
CO = 10µF (ESR = 1 at 1kHz)
9/15
Typical characteristics
LD2979xx
Figure 15. Line transient response
CO = 10µF (ESR = 1 at 1kHz)
10/15
LD2979xx
Package mechanical data
6
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.
1.45
0.10
1.30
0.50
0.20
3.00
1.75
Min.
35.4
0.0
Typ.
Max.
57.1
3.9
A
A1
A2
b
0.90
0.00
0.90
0.35
0.09
2.80
1.50
35.4
13.7
3.5
51.2
19.7
7.8
C
D
E
110.2
59.0
118.1
68.8
e
0.95
37.4
H
L
2.60
0.10
3.00
102.3
3.9
118.1
23.6
0.60
7049676D
12/15
LD2979xx
Package mechanical data
Tape & reel SOT23-xL mechanical data
mm.
inch.
Dim.
Min.
Typ.
Max.
180
Min.
Typ.
Max.
7.086
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
14.4
3.33
3.27
1.47
4.1
0.567
0.131
0.128
0.0.58
0.161
0.161
Ao
Bo
Ko
Po
P
3.13
3.07
1.27
3.9
3.23
3.17
1.37
4.0
0.123
0.120
0.050
0.153
0.153
0.127
0.124
0.054
0.157
0.157
3.9
4.0
4.1
13/15
Revision history
LD2979xx
7
Revision history
Table 5.
Document revision history
Revision
Date
Changes
15-Mar-2005
03-Jul-2006
16-May-2007
08-Jun-2007
09-Apr-2008
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.
14/15
LD2979xx
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