LD2980
Ultra low drop voltage regulators compatible
with low ESR output capacitors
Datasheet - production data
Description
The low drop voltage and the ultra low quiescent
current make them suitable for low noise, low
power applications and in battery powered
systems. The quiescent current in sleep mode is
less than 1 µA when the INHIBIT pin is pulled low.
A shutdown logic control function is available on
pin n° 3 (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. The LD2980 is
designed to work with low ESR ceramic
capacitors. Typical applications are cellular
phone, laptop computer, personal digital assistant
(PDA), personal stereo, camcorder and camera.
SOT23-5L
Features
Stable with low ESR ceramic capacitors
Ultra low dropout voltage (0.12 V typ. at 50 mA
load, 7 mV typ. at 1 mA load)
Very low quiescent current (80 µA typ. at no
load in on mode; max 1 µA in off mode)
Guaranteed output current up to 50 mA
Logic-controlled electronic shutdown
Output voltage of 1.8; 3.0; 3.3; 5.0 V
Internal current and thermal limit
± 0.5% Tolerance output voltage available (A
version)
Output low noise voltage 160 µVRMS
Temperature range: -40 to 125 °C
Smallest package SOT23-5L
Fast dynamic response to line and load
changes
Table 1. Device summary
Part numbers
AB version
C version
Output voltage
LD2980CM18TR
1.8 V
LD2980ABM30TR
3.0 V
LD2980ABM33TR
LD2980CM33TR
3.3 V
LD2980ABM50TR
LD2980CM50TR
5.0 V
November 2019
This is information on a product in full production.
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www.st.com
Contents
LD2980
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7
Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.1
External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.3
Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.4
Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.5
Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.6
Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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1
Diagram
Diagram
Figure 1. Schematic diagram
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22
Pin configuration
2
LD2980
Pin configuration
Figure 2. Pin connections (top view)
SOT23-5L
Table 2. Pin description
Pin n°
Symbol
1
VIN
2
GND
3
INHIBIT
4
NC
5
VOUT
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 0.18 V
Not connected
Output port
Table 3. Thermal data
Symbol
4/22
Parameter
Value
Unit
RthJC
Thermal resistance junction-case
81
°C/W
RthJA
Thermal resistance junction-ambient
255
°C/W
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LD2980
Maximum ratings
3
Maximum ratings
Table 4. Absolute maximum ratings
Symbol
VI
VINH
Note:
Parameter
Value
Unit
DC input voltage
-0.3 to 16
V
INHIBIT input voltage
-0.3 to 16
V
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
TSTG
Storage temperature range
-55 to 150
°C
TOP
Operating junction temperature range
-40 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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Typical application
4
LD2980
Typical application
Figure 3. Application circuit
Note:
6/22
Inhibit pin is not internally pulled-up then it must not be left floating. Disable the device when
connected to GND or to a positive voltage less than 0.18 V.
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LD2980
5
Electrical characteristics
Electrical characteristics
(TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF, CO = 2.2 µF, IO = 1 mA, VINH = 2 V, unless
otherwise specified).
Table 5. Electrical characteristics for LD2980ABM
Symbol
VOP
VO
VO
VO
VO
Parameter
Test conditions
Operating input voltage
Output voltage
Output voltage
Output voltage
Line regulation
Min.
Typ.
2.5
2.978
3.023
IO = 1 to 50 mA, TJ= -40 to 125°C
2.925
3.075
IO = 1 mA
3.284
IO = 1 to 50 mA
3.275
3.325
IO = 1 to 50 mA, TJ= -40 to 125°C
3.217
3.383
IO = 1 mA
4.975
IO = 1 to 50 mA
4.963
5.038
IO = 1 to 50 mA, TJ= -40 to 125°C
4.875
5.125
VO(NOM) + 1 < VIN < 16 V, IO = 1 mA
3
3.3
5
0.003
TJ= -40 to 125°C
100
175
500
IO = 1mA, TJ= -40 to 125°C
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250
µA
700
3
10
15
40
IO = 10mA, TJ= -40 to 125°C
IO = 50mA, TJ= -40 to 125°C
150
5
7
IO = 50mA
100
1
1
IO = 10mA
%/V
0
IO = 0, TJ= -40 to 125°C
Dropout voltage(1)
0.014
V
1200
VINH < 0.18 V, TJ= -40 to 125°C
IO = 1mA
V
5.025
450
IO = 50 mA, TJ= -40 to 125°C
IO = 0
3.317
200
IO = 10 mA, TJ= -40 to 125°C
VINH < 0.18 V
V
150
IO = 1 mA, TJ= -40 to 125°C
IO = 10 mA
3.015
0.032
80
IO = 50 mA
VDROP
V
IO = 1 to 50 mA
IO = 1 mA
OFF MODE
16
2.985
IO = 0, TJ= -40 to 125°C
IQ
Unit
IO = 1 mA
IO = 0
Quiescent current
ON MODE
Max.
60
mV
90
120
150
225
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Electrical characteristics
LD2980
Table 5. Electrical characteristics for LD2980ABM (continued)
Symbol
ISC
Parameter
Test conditions
Min.
Typ.
Max.
Unit
Short circuit current
RL = 0
150
mA
SVR
Supply voltage rejection
CO = 10µF, f = 1kHz
63
dB
VINH
Inhibit input logic low
LOW = Output OFF, TJ= -40 to 125°C
0.8
VINL
Inhibit input logic high
HIGH = Output ON, TJ= -40 to 125°C
IINH
Inhibit input current
eN
Output noise voltage
TSHDN
1.6
0.18
1.3
V
VINH = 0V, TJ= -40 to 125°C
0
-1
VINH = 5V, TJ= -40 to 125°C
5
15
BW = 300 Hz to 50 kHz, CO = 10µF
Thermal shutdown
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µA
160
µVRMS
170
°C
1. For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
8/22
V
LD2980
Electrical characteristics
(TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF, CO = 2.2 µF, IO = 1 mA, VINH = 2 V, unless
otherwise specified).
Table 6. Electrical characteristics for LD2980CM
Symbol
VOP
VO
VO
VO
VO
Parameter
Test conditions
Operating input voltage
Output voltage
Output voltage
Output voltage
Line regulation
Min.
Typ.
2.5
1.773
1.827
IO = 1 to 50 mA, TJ= -40 to 125°C
1.737
1.863
IO = 1 mA
3.267
IO = 1 to 50 mA
3.251
3.35
IO = 1 to 50 mA, TJ= -40 to 125°C
3.184
3.415
IO = 1 mA
4.95
IO = 1 to 50 mA
4.925
5.075
IO = 1 to 50 mA, TJ= -40 to 125°C
4.825
5.175
3.3
5
0.003
TJ= -40 to 125°C
100
175
500
Dropout voltage (1)
IO = 1mA, TJ= -40 to 125°C
40
SVR
µA
700
3
10
60
mV
90
120
IO = 50mA, TJ= -40 to 125°C
ISC
250
15
IO = 10mA, TJ= -40 to 125°C
IO = 50mA
150
5
7
IO = 10mA
100
1
IO = 0, TJ= -40 to 125°C
VDROP
%/V
0
1
IO = 1mA
0.014
V
1200
VINH < 0.18 V, TJ= -40 to 125°C
IO = 0
V
5.05
450
IO = 50 mA, TJ= -40 to 125°C
VINH < 0.18 V
3.333
200
IO = 10 mA, TJ= -40 to 125°C
IO = 50 mA
V
150
IO = 1 mA, TJ= -40 to 125°C
IO = 10 mA
1.818
0.032
80
IO = 1 mA
OFF MODE
V
IO = 1 to 50 mA
IO = 0, TJ= -40 to 125°C
IQ
16
1.782
IO = 0
Quiescent current
ON MODE
Unit
IO = 1 mA
VO(NOM) + 1 < VIN < 16 V, IO = 1 mA
1.8
Max.
150
225
Short circuit current
RL = 0
150
mA
Supply voltage rejection
CO = 10µF, f = 1kHz
63
dB
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Electrical characteristics
LD2980
Table 6. Electrical characteristics for LD2980CM (continued)
Symbol
Parameter
Test conditions
VINH
Inhibit input logic low
LOW = Output OFF, TJ= -40 to 125°C
VINL
Inhibit input logic high
HIGH = Output ON, TJ= -40 to 125°C
IINH
Inhibit input current
eN
Output noise voltage
TSHDN
Min.
1.6
Typ.
Max.
Unit
0.8
0.18
V
1.3
V
VINH = 0V, TJ= -40 to 125°C
0
-1
VINH = 5V, TJ= -40 to 125°C
5
15
BW = 300 Hz to 50 kHz, CO = 10µF
Thermal shutdown
160
µVRMS
170
°C
1. For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
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µF
LD2980
6
Typical performance characteristics
Typical performance characteristics
(TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF, CO = 2.2 µF, VINH = 2 V, unless otherwise
specified)
Figure 4. Output voltage vs temperature
Figure 5. Output voltage vs temperature
Figure 6. Line regulation vs temperature
Figure 7. Load regulation vs temperature
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Typical performance characteristics
LD2980
Figure 8. Dropout voltage vs temperature
Figure 9. Quiescent current vs temperature
Figure 10. Quiescent current vs output
current
Figure 11. Off mode quiescent current vs
temperature
Figure 12. Quiescent current vs input voltage
Figure 13. Dropout voltage vs output current
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LD2980
Typical performance characteristics
Figure 14. Inhibit input current vs temperature
Figure 15. Inhibit voltage vs temperature
Figure 16. Supply voltage rejection vs
frequency
Figure 17. Noise voltage vs frequency
Figure 18. Best case: highest output version
Figure 19. Worst case: lowest output version
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Typical performance characteristics
LD2980
Figure 20. Load transient response
VO = 4.7V, IO = 1 to 100mA, CO = 4.7µF (X7R)
14/22
Figure 21. Line transient response
VI = [VO(NOM) +1V], VO = 4.7V, IO = 100mA, CO = 4.7µF
(X7R)
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LD2980
Application notes
7
Application notes
7.1
External capacitors
Like any low-dropout regulator, the LD2980 requires external capacitors for regulator
stability. This capacitor must be selected to meet the requirements of minimum capacitance
and equivalent series resistance (please refer to Figure 18 and Figure 19). We suggest to
solder input and output capacitors as close as possible to the relative pins.
7.2
Input capacitor
An input capacitor whose value is 1 µF is required with the LD2980 (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.
7.3
Output capacitor
The LD2980 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. The Figure 18 and Figure 19
show the allowable ESR range as a function of the output capacitance. These curves
represent the stability region over the full temperature and IO range. 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 output voltages from 2.85 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 (see Figure 18 and
Figure 19 to choose the right value according to the used version and keeping in account
that the ESR of ceramic capacitors has been measured @ 100 kHz).
7.4
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.
7.5
Inhibit input operation
The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically
reducing the current consumption down to less than 1 µA. When the inhibit feature is not
used, this pin must be tied to VI to keep the regulator output ON at all times. To assure
proper operation, the signal source used to drive the inhibit pin must be able to swing above
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Application notes
LD2980
and below the specified thresholds listed in the electrical characteristics section under VIH
VIL. Any slew rate can be used to drive the inhibit.
7.6
Reverse current
The power transistor used in the LD2980 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 VREV voltage is applied on
the output, the reverse current measured, according to the test circuit in Figure 22, flows to
the GND across the two feedback resistors. This current typical value is 160 µA. R1 and R2
resistors are implanted type; typical values are, respectively, 42.6 k and 51.150 k.
Figure 22. Reverse current test circuit
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8
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.
Table 7. SOT23-5L mechanical data
mm
Dim.
Min.
Typ.
Max.
A
0.90
1.45
A1
0
0.15
A2
0.90
1.30
b
0.30
0.50
c
2.09
0.20
D
2.95
E
1.60
e
0.95
H
2.80
L
0.30
0.60
0
8
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Package mechanical data
LD2980
Figure 23. SOT23-5L mechanical drawing
BN
Figure 24. SOT23-5L recommended footprint (dimensions in mm)
BN
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LD2980
9
Packaging mechanical data
Packaging mechanical data
Figure 25. SOT23-5L reel mechanical drawing
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Packaging mechanical data
LD2980
Figure 26. SOT23-5L oriented tape outline
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Figure 27. SOT23-5L reel outline
Table 8. SOT23-5L reel mechanical data
Dimensions (mm)
Symbol
20/22
Min.
Typ.
Max.
A
-
-
180
C
12.8
13.0
13.2
D
20.2
-
-
N
60
-
-
T
-
-
14.4
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10
Revision history
Revision history
Table 9. Document revision history
Date
Revision
03-Jul-2006
13
Order codes updated and new template.
13-Nov-2006
14
Add part number LD2980ABU18TR.
06-Sep-2007
15
Add Table 1 on page 1.
14-Feb-2008
16
Modified: Table 1 on page 1.
11-Jul-2008
17
Modified: Table 1 on page 1.
18
Document name changed from LD2980ABxx and LD2980Cxx to
LD2980.
Updated Table 1: Device summary, Table 5: Electrical characteristics
for LD2980ABM, Table 6: Electrical characteristics for LD2980CM
and Section 8: Package information.
Added Section 9: Packaging information.
Minor text changes in title, in features and description in cover page.
30-Aug-2017
19
Removed 5.0 V versions of device (updated Features, Table 1:
Device summary, Table 5: Electrical characteristics for LD2980ABM,
and Table 6: Electrical characteristics for LD2980C.
Minor textual updates.
07-Dec-2017
20
Updated Table 1: Device summary on the cover page.
11-Nov-2019
21
Updated Figure 25: SOT23-5L reel mechanical drawing added
Figure 26: SOT23-5L oriented tape outline.
06-Nov-2013
Changes
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LD2980
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