LD2980
Ultra low drop voltage regulators compatible
with low ESR output capacitors
Datasheet
-
production data
Description
Features
SOT23-5L
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
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.
Part numbers
AB version
LD2980ABM30TR
LD2980ABM33TR
LD2980ABM50TR
C version
LD2980CM18TR
LD2980CM33TR
LD2980CM50TR
Output voltage
1.8 V
3.0 V
3.3 V
5.0 V
November 2019
This is information on a product in full production.
DocID6280 Rev 21 1/22 www.st.com
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Contents
Contents
LD2980
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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LD2980
1 Diagram
Figure 1. Schematic diagram
Diagram
DocID6280 Rev 21 3/22
22
Pin configuration
2 Pin configuration
Figure 2. Pin connections (top view)
LD2980
Pin n°
1
2
3
4
5
SOT23-5L
Symbol
V
IN
GND
INHIBIT
NC
V
OUT
Table 2. Pin description
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
Symbol
R thJC
R thJA
Table 3. Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
Value
81
255
Unit
°C/W
°C/W
4/22 DocID6280 Rev 21
LD2980
3 Maximum ratings
Symbol
V
I
V
INH
I
O
P
D
T
STG
T
OP
Maximum ratings
Table 4. Absolute maximum ratings
Parameter
DC input voltage
INHIBIT input voltage
Output current
Power dissipation
Storage temperature range
Operating junction temperature range
Value
-0.3 to 16
-0.3 to 16
Internally limited
Internally limited
-55 to 150
-40 to 125
Unit
V
V
°C
°C
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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Typical application
4 Typical application
Figure 3. Application circuit
LD2980
Note: 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.
6/22 DocID6280 Rev 21
LD2980
5 Electrical characteristics
Electrical characteristics
(T
J
= 25 ° C, V
I
= V
O(NOM) otherwise specified).
+1 V, C
I
= 1 µF, C
O
= 2.2 µF, I
O
= 1 mA, V
INH
= 2 V, unless
Symbol
V
OP
Table 5. Electrical characteristics for LD2980ABM
Parameter
Operating input voltage
Test conditions Min.
V
O
V
O
V
O
V
O
I
Q
Output voltage
Output voltage
Output voltage
Line regulation
Quiescent current
ON MODE
OFF MODE
V
DROP
Dropout voltage
(1)
I
O
= 1 mA
I
O
= 1 to 50 mA
I
O
= 1 to 50 mA, T
J
= -40 to 125°C
I
O
= 1 mA
I
O
= 1 to 50 mA
I
O
= 1 to 50 mA, T
J
= -40 to 125°C
I
O
= 1 mA
I
O
= 1 to 50 mA
I
O
= 1 to 50 mA, T
J
= -40 to 125°C
V
O(NOM)
+ 1 < V
IN
< 16 V, I
O
= 1 mA
T
J
= -40 to 125°C
I
O
= 0
I
O
= 0, T
J
= -40 to 125°C
I
O
= 1 mA
I
O
= 1 mA, T
J
= -40 to 125°C
I
O
= 10 mA
I
O
= 10 mA, T
J
= -40 to 125°C
I
O
= 50 mA
I
O
= 50 mA, T
J
= -40 to 125°C
V
INH
< 0.18 V
V
INH
< 0.18 V, 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
2.5
2.985
2.978
2.925
3.284
3.275
3.217
4.975
4.963
4.875
Typ.
Max.
Unit
3
3.3
5
3.383
5.025
5.038
5.125
0.003
0.014
0.032
80
100
100
150
150
175
500
0
1
7
40
120
16
3.015
3.023
3.075
3.317
3.325
5
10
15
1
3
60
90
150
225
200
250
450
700
1200
V
V
V
V
%/V
µA mV
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Electrical characteristics LD2980
Symbol
Table 5. Electrical characteristics for LD2980ABM (continued)
Parameter Test conditions Min.
Typ.
Max.
Unit
I
V
V
SC
INH
INL
Short circuit current
SVR Supply voltage rejection
I
INH
Inhibit input logic low
Inhibit input logic high
Inhibit input current
R
L
= 0
C
O
= 10µF, f = 1kHz
LOW = Output OFF, T
J
= -40 to 125°C
HIGH = Output ON, 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
W
= 300 Hz to 50 kHz, C
O
= 10µF
1.6
150
63
0.8
1.3
0
5
0.18
-1
15 e
N
T
SHDN
Output noise voltage
Thermal shutdown
160
170
1. For V
O
< 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
mA dB
V
V
µA
µV
RMS
°C
8/22 DocID6280 Rev 21
LD2980 Electrical characteristics
Symbol
V
OP
(T
J
= 25 °C, V
I
= V
O(NOM) otherwise specified).
+1 V, C
I
= 1 µF, C
O
= 2.2 µF, I
O
= 1 mA, V
INH
= 2 V, unless
Parameter
Table 6. Electrical characteristics for LD2980CM
Operating input voltage
Test conditions Min.
Typ.
Max.
Unit
V
V
O
V
O
V
O
V
O
I
Q
V
DROP
Output voltage
Output voltage
Output voltage
Line regulation
Quiescent current
ON MODE
OFF MODE
Dropout voltage
(1)
I
SC
Short circuit current
SVR Supply voltage rejection
I
O
= 1 mA
I
O
= 1 to 50 mA
I
O
= 1 to 50 mA, T
J
= -40 to 125°C
I
O
= 1 mA
I
O
= 1 to 50 mA
I
O
= 1 to 50 mA, T
J
= -40 to 125°C
I
O
= 1 mA
I
O
= 1 to 50 mA
I
O
= 1 to 50 mA, T
J
= -40 to 125°C
V
O(NOM)
+ 1 < V
IN
< 16 V, I
O
= 1 mA
T
J
= -40 to 125°C
I
O
= 0
I
O
= 0, T
J
= -40 to 125°C
I
O
= 1 mA
I
O
= 1 mA, T
J
= -40 to 125°C
I
O
= 10 mA
I
O
= 10 mA, T
J
= -40 to 125°C
I
O
= 50 mA
I
O
= 50 mA, T
J
= -40 to 125°C
V
INH
< 0.18 V
V
INH
< 0.18 V, 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
R
L
= 0
C
O
= 10µF, f = 1kHz
3.251
3.184
4.95
4.925
4.825
2.5
1.782
1.773
1.737
3.267
1.8
3.3
3.35
3.415
5.05
5
5.075
5.175
0.003
0.014
16
1.818
1.827
1.863
3.333
80
100
175
500
0.032
100
150
150
200
250
450
700
1200
0
1
7
40
120
60
90
150
225
5
10
1
3
15
150
63
V
V
V
%/V
µA mV mA dB
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Electrical characteristics LD2980
Symbol
Table 6. Electrical characteristics for LD2980CM (continued)
Parameter Test conditions Min.
Typ.
Max.
Unit
V
V
I
INH
INL
INH
Inhibit input logic low
Inhibit input logic high
Inhibit input current
LOW = Output OFF, T
J
= -40 to 125°C
HIGH = Output ON, 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
W
= 300 Hz to 50 kHz, C
O
= 10µF
1.6
0.8
1.3
0
5
0.18
-1
15 e
N
T
SHDN
Output noise voltage
Thermal shutdown
160
170
1. For V
O
< 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
V
V
µF
µV
RMS
°C
10/22 DocID6280 Rev 21
LD2980
6
Typical performance characteristics
Typical performance characteristics
(T
J
= 25 °C, V
I
= V
O(NOM) specified)
+1 V, C
I
= 1 µF, C
O
= 2.2 µF, V
INH
= 2 V, unless otherwise
Figure 4. Output voltage vs temperature Figure 5. Output voltage vs temperature
Figure 6. Line regulation vs temperature Figure 7. Load regulation vs temperature
DocID6280 Rev 21 11/22
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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
12/22 DocID6280 Rev 21
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
DocID6280 Rev 21 13/22
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Typical performance characteristics
Figure 20. Load transient response Figure 21. Line transient response
LD2980
V
O
= 4.7V, I
O
= 1 to 100mA, C
O
= 4.7µF (X7R) V
I
= [V
(X7R)
+1V], V
O
= 4.7V, I
O
= 100mA, C
O
= 4.7µF
14/22 DocID6280 Rev 21
LD2980
7
7.1
Application notes
Application notes
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
7.3
7.4
7.5
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.
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 I
O
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).
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
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 V
I
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
DocID6280 Rev 21 15/22
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Application notes LD2980 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.
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 V
REV
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. R
1
and R
2 resistors are implanted type; typical values are, respectively, 42.6 k and 51.150 k .
Figure 22. Reverse current test circuit
16/22 DocID6280 Rev 21
LD2980
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.
Dim.
c
D
E
L
e
H
A
A1
A2 b
Table 7. SOT23-5L mechanical data mm
Typ.
Min.
0.90
0
0.90
0.30
2.09
2.95
1.60
0.95
2.80
0.30
0
Max.
1.45
0.15
1.30
0.50
0.20
0.60
8
DocID6280 Rev 21 17/22
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Package mechanical data
Figure 23. SOT23-5L mechanical drawing
LD2980
Figure 24. SOT23-5L recommended footprint (dimensions in mm)
BN
BN
18/22 DocID6280 Rev 21
LD2980
9 Packaging mechanical data
Packaging mechanical data
Figure 25. SOT23-5L reel mechanical drawing
DocID6280 Rev 21 19/22
22
Packaging mechanical data
Figure 26. SOT23-5L oriented tape outline
LD2980
8VHU'LUHFWLRQRI)HHG
Figure 27. SOT23-5L reel outline
20/22
Symbol
A
C
D
N
T
Table 8. SOT23-5L reel mechanical data
Dimensions (mm)
Min.
-
12.8
20.2
60
-
Typ.
-
13.0
-
-
-
DocID6280 Rev 21
Max.
180
13.2
-
-
14.4
LD2980
10 Revision history
Revision history
Date
03-Jul-2006
13-Nov-2006
06-Sep-2007
14-Feb-2008
11-Jul-2008
06-Nov-2013
30-Aug-2017
07-Dec-2017
11-Nov-2019
Revision
Table 9. Document revision history
Changes
13
14
15
16
17
18
19
20
21
Order codes updated and new template.
Add part number LD2980ABU18TR.
Add Table 1 on page 1.
Modified: Table 1 on page 1.
Modified: Table 1 on page 1.
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.
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.
Updated Table 1: Device summary on the cover page.
Updated Figure 25: SOT23-5L reel mechanical drawing added
Figure 26: SOT23-5L oriented tape outline .
DocID6280 Rev 21 21/22
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LD2980
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© 2019 STMicroelectronics – All rights reserved
22/22 DocID6280 Rev 21
