STMicroelectronics Very low drop and low noise voltage regulator Datasheet
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LD2982BXX18
Very low drop and low noise voltage regulator with inhibit function, low ESR capacitors compatible
Features
■
■
■
■
■
■
■
■
■
■
■
■
Very low dropout voltage (120 mV at 50 mA and 7 mV at 1 mA load)
Very low quiescent current (375 mA typ. at
50 mA load and 75 mA at 1 mA)
Output current up to 50 mA
Logic controlled electronic shutdown
Output voltage of 1.8 V
Internal current and thermal limit
Available in ± 1 % tolerance
(at 25 °C, A version)
Supply voltage rejection: 45 dB (typ)
Only 1 µF for stability
Low output noise voltage 30 µVrms
Smallest package SOT23-5L
Temperature range: -40 °C to 125 °C
Description
The LD2982 is a 50 mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1 µA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin 3 (TTL compatible). This
SOT23-5L
Typical application are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
standby, decreasing the total power consumption.
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30 µVrms.
Table 1.
Device summary
Order code
LD2982BM18R
Output voltage
1.8 V
July 2009 Doc ID 8188 Rev 7 1/17 www.st.com
17
Contents
Contents
LD2982BXX18
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
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LD2982BXX18
1 Diagram
Figure 1.
Schematic diagram
Diagram
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Doc ID 8188 Rev 7 3/17
LD2982BXX18 Pin configuration
2 Pin configuration
Figure 2.
Pin connections (top view)
Table 2.
Pin n°
1
2
3
4
5
Pin description
Symbol
IN
GND
INHIBIT
Bypass
OUT
Name and function
Input port
Ground pin
Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating.
Disable the device when connected to GND or to a positive voltage less than 0.18V
Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise performances
Output port
Table 3.
Symbol
R thJC
R thJA
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
SOT23-5L
81
255
Unit
°C/W
°C/W
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4/17 Doc ID 8188 Rev 7
LD2982BXX18
3 Maximum
Maximum ratings
Table 4.
Symbol
Absolute maximum ratings
Parameter
V
I
V
INH
I
O
P
D
T
STG
T
OP
DC input voltage
INHIBIT input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Note:
Value
16
16
Internally limited
Internally limited
-65 to 150
-40 to 125
Unit
V
V
°C
°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 LD2982BXX18
T
J
= 25 °C, V
I
= V
O
+ 1 V, I
O
= 1 mA, V
SHDN
= 2 V, C
I
= C
O
= 1 µF, unless otherwise specified.
Table 5.
Symbol
Electrical characteristics for LD2982BXX18
Parameter Test conditions Min.
Typ.
Max.
Unit
Operating input voltage 2.5
16 V V
OP
V
O
V
O
V
O
V
O
V
O
V
O
V
O
V
O
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage V
O
= -40 to 125°C 3.088
3.312
Output voltage
I
O
= 1 to 50mA, T
J
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V
O
V
I
= 4.3V
I
O
= 1 to 50mA
3.250
3.234
3.3
3.349
3.366
V
I
O
= 1 to 50mA, T
J
V
I
= 4.5V
3.184
3.415
= -40 to 125°C Obsolete Product(s) - Obsolete Product(s)
3.447
3.5
3.552
V
O
Output voltage 3.430
3.370
V
Output voltage
V
I
= 2.5V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 2.8V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 3.5V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 3.8V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 3.85V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 4.0V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 4.1V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 4.2V
I
O
= 1 to 50mA
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 4.6V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
1.477
1.470
1.447
1.773
1.764
1.737
2.462
2.45
2.412
2.758
2.744
2.702
2.807
2.85
2.893
2.793
2.750
2.955
2.94
2.895
3.053
3.038
2.991
3.152
3.136
3.377
3.546
3.528
3.474
1.5
1.8
2.5
2.8
3.0
3.1
3.2
3.6
1.523
1.530
1.553
1.827
1.836
1.863
2.537
2.55
2.587
2.842
2.856
2.898
2.907
2.950
3.045
3.06
3.105
3.146
3.162
3.208
3.248
3.264
3.662
3.654
3.672
3.726
V
V
V
V
V
V
V
V
V
6/17 Doc ID 8188 Rev 7
LD2982BXX18 Electrical characteristics
Table 5.
Symbol
Electrical characteristics for LD2982BXX18 (continued)
Parameter Test conditions Min.
Typ.
Max.
Unit
V
O
V
O
V
O
V
O
I
SC
Δ V
O
/ Δ V
I
V
DROP
I
Q
Output voltage
Output voltage
Output voltage
Output voltage
Short circuit current
Line regulation
Dropout voltage
Quiescent current
ON MODE
V
I
= 4.8V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 5.0V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 5.7V
I
O
= 1 to 50mA
I
O
= 1 to 50mA, T
J
= -40 to 125°C
V
I
= 6.0V
I
O
= 1 to 50mA
I
O
= 1 to 100 mA, T
J
= -40 to 125°C
R
L
= 0
V
I
= V
O
+ 1V to 16V, I
O
= 1 mA
V
I
= V
O
+ 1V to 16V, I
O
= 1 mA,
T
J
= -40 to 125°C
I
O
= 0
I
O
= 0, T
J
= -40 to 125°C
I
O
= 1mA
I
O
= 1mA, T
J
= -40 to 125°C
I
O
= 10mA
I
O
= 10mA, T
J
= -40 to 125°C
I
O
= 50mA
I
O
= 50mA, T
J
= -40 to 125°C
I
O
= 0
I
O
= 0, T
J
= -40 to 125°C
I
O
= 1mA
I
O
= 1mA, T
J
= -40 to 125°C
I
O
= 10mA
I
O
= 10mA, T
J
= -40 to 125°C
I
O
3.743
3.724
3.667
3.94
3.92
3.86
4.629
4.606
4.535
4.925
4.9
4.825
3.8
4
4.7
5
400
1
7
40
120
80
100
200
3.857
3.876
3.933
4.06
4.08
4.14
4.77
4.794
4.864
5.075
5.1
5.175
0.003
0.014
0.032
3
5
10
15
60
90
150
225
100
150
150
200
300
400
V
V
V
V mA
%/V
I mV
µA
I
O
= 50mA, T
J
= -40 to 125°C
V
INH
<0.18V
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SVR
V
INH
<0.18V, T
J
= -40 to 125°C
= 10µF, f = 1kHz
0
45 dB Supply voltage rejection C
BYP
= 0.01µF, C
O
V
IL
V
IH
I
INH e
N
Inhibit input logic low
Inhibit input logic high
Inhibit input current
Output noise voltage
T
J
= -40 to 125°C
T
J
= -40 to 125°C
V
INH
= 0V, T
J
= -40 to 125°C
V
INH
= 5V, T
J
= -40 to 125°C
B = 300 Hz to 50 kHz, C
BYP
= 0.01µF,
C
O
= 10µF
2
5
0
30
0.15
15
-1
V
V
µA
µV
Doc ID 8188 Rev 7 7/17
Typical characteristics LD2982BXX18
(T
J
= 25 °C, V
I
= V
O(NOM) otherwise specified).
+1 V, C
I
= 1 µF (X7R), C
O
= 2.2 µF (X7R), V
INH
= 2 V, unless
Figure 3.
Output voltage vs. temperature Figure 4.
Dropout voltage vs. temperature
Figure 5.
Dropout voltage vs. output current Figure 6.
Quiescent current vs. load current
Figure 7.
Quiescent current vs. temperature Figure 8.
Supply voltage rejection vs. temp.
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8/17 Doc ID 8188 Rev 7
LD2982BXX18 Typical characteristics
Figure 9.
Supply voltage rejection vs. output current
Figure 10.
Supply voltage rejection vs. output current
Figure 11.
Supply voltage rejection vs. frequency
Figure 12.
Supply voltage rejection vs. frequency
Figure 13.
Line transient Figure 14.
Line transient
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V
O
= 2.5V, I
O
= 50mA, no C
I
, C
O
= 4.7µF, t r
=t f
=2ns V
O
= 2.5V, I
O
= 50mA, no C
I
, C
O
= 4.7µF, t r
=t f
=1µs
Doc ID 8188 Rev 7 9/17
Typical characteristics
Figure 15.
Load transient Figure 16.
Load transient
LD2982BXX18
V
O
= 2.5V, I
O
= 0 to 50mA, no C
I
, C
O
= 10µF, t r
=t f
=2ns
V
O
= 2.5V, I
O
= 0 to 50mA, no C
I
, C
O
= 4.7µF, t r
=t f
=2ns
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10/17 Doc ID 8188 Rev 7
LD2982BXX18 Application notes
Like any low-dropout regulator, the LD2982 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 output capacitors as close as possible to the relative pins.
An input capacitor whose value is 1 µF is required with the LD2982 (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than
0.5" from the input pin of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for this capacitor.
The LD2982 is designed specifically to work with ceramic output capacitors. It may also be possible to use tantalum capacitors, but these are not as attractive for reasons of size and cost. By the way, the output capacitor must meet both the requirement for minimum amount of capacitance and ESR (equivalent series resistance) value. Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output capacitor value, if low ESR ceramic type is used, is 1 µF for output voltages equal or major than 3.8 V, 2.2 µF for V
O
going from 1.8 to 3.3 V, and 3.3 µF for the other versions. However, if an output capacitor lower than the suggested one is used, it's possible to make stable the regulator adding a resistor in series to the capacitor.
6.4 Important
The output capacitor must maintain its ESR in the stable region over the full operating temperature to assure stability. Also, capacitor tolerance and variation with temperature must be considered to assure the minimum amount of capacitance is provided at all times.
This capacitor should be located not more than 0.5" from the output pin of the device and returned to a clean analog ground.
Inhibit input operation
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to keep the regulator output ON at all times. To assure used, this pin must be tied to V
I proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section under V
IH
V
IL
. Any slew rate can be used to drive the inhibit.
Doc ID 8188 Rev 7 11/17
Application notes LD2982BXX18
The power transistor used in the LD2982 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 across the series pass transistor. When a V
REV
voltage is applied on the output, the reverse current measured flows to the GND across the two feedback resistors. This current typical value is 160 µA. R
1
and R
2
resistors are implanted type; typical values are, respectively, 42.6 k Ω and 51.150 k Ω .
Figure 17.
Reverse current test circuit
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LD2982BXX18
7 Package mechanical data
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: www.st.com
.
ECOPACK
®
is an ST trademark.
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Doc ID 8188 Rev 7 13/17
Dim.
A
A1
E e
H
C
D
A2 b
L
Package mechanical data
Min.
0.
9 0
0.00
0.
9 0
0.
3 5
0.0
9
2.
8 0
1.50
2.60
0.10
S
OT2
3
-5L mechanical data
mm.
Typ.
Max.
1.45
0.10
1.
3 0
0.50
0.20
3 .00
1.75
Min.
3 5.4
0.0
3 5.4
1 3 .7
3 .5
110.2
5 9 .0
0.
9 5
3 .00
0.60
102.
3
3 .
9
LD2982BXX18 mil s .
Typ.
3 7.4
Max.
57.1
3 .
9
51.2
1 9 .7
7.
8
11 8 .1
6 8 .
8
11 8 .1
2 3 .6
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704 9 676D
14/17 Doc ID 8188 Rev 7
Dim.
T
Ao
Bo
Ko
Po
P
A
C
D
N
LD2982BXX18 Package mechanical data
3 .1
3
3 .07
1.27
3 .
9
3 .
9
Min.
12.
8
20.2
60
Tape & reel
S
OT2
3
-xL mechanical data
mm.
Typ.
Min.
1 3 .0
Max.
1 8 0
1 3 .2
0.504
0.7
9 5
2.
3 62 inch.
Typ.
0.512
3 .2
3
3 .17
1.
3 7
4.0
4.0
14.4
3 .
33
3 .27
1.47
4.1
4.1
0.12
3
0.120
0.050
0.15
3
0.15
3
0.127
0.124
0.054
0.157
0.157
Max.
7.0
8 6
0.51
9
0.567
0.1
3 1
0.12
8
0.0.5
8
0.161
0.161
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Revision history
8 Revision history
Table 6.
Date
Document revision history
25-Jul-2006
14-Feb-2008
10-Jul-2008
29-Jul-2009
Revision
6
7
4
5
Changes
Order codes updated.
.
.
LD2982BXX18
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16/17 Doc ID 8188 Rev 7
LD2982BXX18
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