LD2981(AB,C)xx Datasheet by STMicroelectronics

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K ’I hiegugmented SOT23-5L SOT-89
April 2016
DocID6279 Rev 17
1/27
This is information on a product in full production.
www.st.com
LD2981
Ultra low-drop voltage regulators with inhibit
Datasheet - production data
Features
Ultra low dropout voltage (0.17 V typ. at 100
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 100 mA
Logic-controlled electronic shutdown
Output voltage of 2.5; 3.0; 3.3; 5.0 V
Internal current and thermal limit
± 0.75% tolerance output voltage available
(A version)
Output low noise voltage 160 μVRMS
Temperature range: -40 to 125 °C
Small package SOT23-5L and SOT-89
Fast dynamic response to line and load
changes
Description
The LD2981 is a 100 mA fixed-output voltage
regulator. 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 INHIBIT pin is pulled low. 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 LD2981 is designed to
work with low ESR ceramic capacitor. Typical
applications are in cellular phone, palmtop/laptop
computer, personal digital assistant (PDA),
personal stereo, camcorder and camera.
LD2981
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DocID6279 Rev 17
Contents
1 Diagram ............................................................................................ 5
2 Pin configuration ............................................................................. 6
3 Maximum ratings ............................................................................. 7
4 Typical application .......................................................................... 8
5 Electrical characteristics ................................................................ 9
6 Typical performance characteristics ........................................... 12
7 Application notes .......................................................................... 16
7.1 External capacitors .......................................................................... 16
7.2 Input capacitor ................................................................................. 16
7.3 Output capacitor .............................................................................. 16
7.4 Important ......................................................................................... 16
7.5 Inhibit input operation ...................................................................... 16
7.6 Reverse current ............................................................................... 17
8 Package information ..................................................................... 18
8.1 SOT-89 package information .......................................................... 18
8.2 SOT-89 packing information............................................................ 21
8.3 SOT23-5L package information ...................................................... 22
8.4 SOT23-5L packing information ........................................................ 24
9 Ordering information ..................................................................... 25
10 Revision history ............................................................................ 26
LD2981
List of tables
DocID6279 Rev 17
3/27
List of tables
Table 1: Pin description .............................................................................................................................. 6
Table 2: Thermal data ................................................................................................................................. 6
Table 3: Absolute maximum ratings ........................................................................................................... 7
Table 4: Electrical characteristics for LD2981AB ....................................................................................... 9
Table 5: Electrical characteristics for LD2981C ........................................................................................ 10
Table 6: SOT-89 mechanical data ............................................................................................................ 19
Table 7: SOT-89 carrier tape mechanical data ......................................................................................... 21
Table 8: SOT23-5L package mechanical data ......................................................................................... 22
Table 9: SOT23-5L tape and reel mechanical data .................................................................................. 24
Table 10: Order codes .............................................................................................................................. 25
Table 11: Document revision history ........................................................................................................ 26
List of figures
LD2981
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DocID6279 Rev 17
List of figures
Figure 1: Schematic diagram ...................................................................................................................... 5
Figure 2: Pin connections (top view) ........................................................................................................... 6
Figure 3: Application circuit ......................................................................................................................... 8
Figure 4: Output voltage vs temperature .................................................................................................. 12
Figure 5: Dropout voltage vs temperature ................................................................................................ 12
Figure 6: Line regulation vs temperature .................................................................................................. 12
Figure 7: Load regulation vs temperature ................................................................................................. 12
Figure 8: Dropout voltage vs temperature ................................................................................................ 13
Figure 9: Quiescent current vs temperature ............................................................................................. 13
Figure 10: Quiescent current vs output current ........................................................................................ 13
Figure 11: Off mode quiescent current vs temperature ............................................................................ 13
Figure 12: Quiescent current vs input voltage .......................................................................................... 13
Figure 13: Dropout voltage vs output current ........................................................................................... 13
Figure 14: Inhibit input current vs temperature ......................................................................................... 14
Figure 15: Inhibit voltage vs temperature ................................................................................................. 14
Figure 16: Supply voltage rejection vs frequency ..................................................................................... 14
Figure 17: Noise voltage vs frequency ..................................................................................................... 14
Figure 18: Best case: highest output version ........................................................................................... 14
Figure 19: Worst case: lowest output version ........................................................................................... 14
Figure 20: Load transient response .......................................................................................................... 15
Figure 21: Line transient response ........................................................................................................... 15
Figure 22: Reverse current test circuit ...................................................................................................... 17
Figure 23: SOT-89 package outline .......................................................................................................... 18
Figure 24: SOT-89 recommended footprint .............................................................................................. 20
Figure 25: SOT-89 carrier tape outline ..................................................................................................... 21
Figure 26: SOT23-5L package outline ...................................................................................................... 22
Figure 27: SOT23-5L recommended footprint .......................................................................................... 23
Figure 28: SOT23-5L tape and reel outline .............................................................................................. 24
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LD2981
Diagram
DocID6279 Rev 17
5/27
1 Diagram
Figure 1: Schematic diagram
Vouv NC El |7| {Ll m Ill Vm 6ND INHIBIT 5mm SOT23-5L (—1 1 2 3 U U U VOUT 0ND VIN Km:- SOT-89 GIPDMmzmaMssMT
Pin configuration
LD2981
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2 Pin configuration
Figure 2: Pin connections (top view)
Table 1: Pin description
Pin n°
SOT23-5L
Pin n°
SOT-89
Symbol
Name and function
1
3
VIN
Input port
2
2
GND
Ground pin
3
INHIBIT
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
4
NC
Not connected
5
1
VOUT
Output port
Table 2: Thermal data
Symbol
Parameter
SOT23-5L
SOT-89
Unit
RthJC
Thermal resistance junction-case
81
15
°C/W
RthJA
Thermal resistance junction-ambient
255
110
°C/W
LD2981
Maximum ratings
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3 Maximum ratings
Table 3: Absolute maximum ratings
Symbol
Parameter
Value
Unit
VI
DC input voltage
-0.3 to 16
V
VINH
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.
C|=1ILF orri INH GND OUT iON C°=2.2;1.F (:51 2510 ewwmumzouw
Typical application
LD2981
8/27
DocID6279 Rev 17
4 Typical application
Figure 3: Application circuit
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.
LD2981
Electrical characteristics
DocID6279 Rev 17
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5 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 4: Electrical characteristics for LD2981AB
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VOP
Operating input
voltage
2.5
16
V
VO
Output voltage
IO = 1 mA
2.977
3
3.023
V
IO = 1 to 100 mA
2.97
3.03
IO = 1 to 100 mA, TJ = -40 to 125 °C
2.925
3.075
VO
Output voltage
IO = 1 mA
3.275
3.3
3.325
V
IO = 1 to 100 mA
3.267
3.333
IO = 1 to 100 mA, TJ = -40 to 125 °C
3.217
3.383
VO
Output voltage
IO = 1 mA
4.962
5
5.038
V
IO = 1 to 100 mA
4.95
5.05
IO = 1 to 100 mA, TJ = -40 to 125 °C
4.875
5.125
ΔVO
Line regulation
VO(NOM) + 1 < VIN < 16 V, IO = 1 mA
0.003
0.014
%/V
TJ = -40 to 125 °C
0.032
IQ
Quiescent
current ON
MODE
IO = 0
80
100
µA
IO = 0, TJ = -40 to 125 °C
150
IO = 1 mA
100
150
IO = 1 mA, TJ = -40 to 125 °C
200
IO = 25 mA
250
400
IO = 25 mA, TJ = -40 to 125 °C
800
IO = 100 mA
1000
1300
IO = 100 mA, TJ = -40 to 125 °C
2600
OFF MODE
VINH < 0.3 V
0.8
VINH < 0.15 V, TJ = -40 to 125 °C
2
VDROP
Dropout
voltage (1)
IO = 0
1
3
mV
IO = 0, TJ = -40 to 125 °C
5
IO = 1 mA
7
10
IO = 1 mA, TJ = -40 to 125 °C
15
IO = 25 mA
70
100
IO = 25 mA, TJ = -40 to 125 °C
150
IO = 100 mA
180
250
IO = 100 mA, TJ = -40 to 125 °C
375
ISC
Short circuit
current
RL = 0
150
mA
Electrical characteristics
LD2981
10/27
DocID6279 Rev 17
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
SVR
Supply voltage
rejection
CO = 10 µF, f = 1 KHz
63
dB
VINH
Inhibit input logic
low
LOW = Output OFF,
TJ = -40 to 125 °C
0.18
V
VINL
Inhibit input logic
high
HIGH = Output ON,
TJ = -40 to 125 °C
1.6
V
IINH
Inhibit input
current
VINH = 0 V, TJ = -40 to 125 °C
0
-1
µA
VINH = 5 V, TJ = -40 to 125 °C
5
15
eN
Output noise
voltage
BW = 300 Hz to 50 KHz, CO = 10 µF
160
µVRMS
TSHDN
Thermal
shutdown
170
°C
Notes:
(1) For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature
range.
(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 LD2981C
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
VOP
Operating input
voltage
2.5
16
V
VO
Output voltage
IO = 1 mA
2.468
2.5
2.531
V
IO = 1 to 100 mA
2.45
2.55
IO = 1 to 100 mA, TJ = -40 to 125 °C
2.412
2.587
VO
Output voltage
IO = 1 mA
2.962
3
3.037
V
IO = 1 to 100 mA
2.94
3.06
IO = 1 to 100 mA, TJ = -40 to 125 °C
2.895
3.105
VO
Output voltage
IO = 1 mA
3.258
3.3
3.341
V
IO = 1 to 100 mA
3.234
3.366
IO = 1 to 100 mA, TJ = -40 to 125 °C
3.184
3.415
VO
Output voltage
IO = 1 mA
4.937
5
5.062
V
IO = 1 to 100 mA
4.9
5.1
IO = 1 to 100 mA, TJ = -40 to 125 °C
4.825
5.175
ΔVO
Line regulation
VO(NOM) + 1 < VIN < 16 V, IO = 1 mA
0.003
0.014
%/V
TJ = -40 to 125 °C
0.032
LD2981
Electrical characteristics
DocID6279 Rev 17
11/27
Symbol
Parameter
Test conditions
Min.
Typ.
Max.
Unit
IQ
Quiescent
current
ON MODE
IO = 0
80
100
µA
IO = 0, TJ = -40 to 125 °C
150
IO = 1 mA
100
150
IO = 1 mA, TJ = -40 to 125 °C
200
IO = 25 mA
250
400
IO = 25 mA, TJ = -40 to 125 °C
800
IO = 100 mA
1000
1300
IO = 100 mA, TJ = -40 to 125 °C
2600
OFF MODE
VINH < 0.3 V
0.8
VINH < 0.15 V, TJ = -40 to 125 °C
2
VDROP
Dropout
voltage (1)
IO = 0
1
3
mV
IO = 0, TJ = -40 to 125 °C
5
IO = 1 mA
7
10
IO = 1 mA, TJ = -40 to 125 °C
15
IO = 25 mA
70
100
IO = 25 mA, TJ = -40 to 125 °C
150
IO = 100 mA
180
250
IO = 100 mA, TJ = -40 to 125 °C
375
ISC
Short circuit
current
RL = 0
150
mA
SVR
Supply voltage
rejection
CO = 10 µF, f = 1 KHz
63
dB
VINH
Inhibit input
logic low
LOW = Output OFF,
TJ = -40 to 125 °C
0.18
V
VINL
Inhibit input
logic high
HIGH = Output ON,
TJ = -40 to 125 °C
1.6
V
IINH
Inhibit input
current
VINH = 0 V, TJ = -40 to 125 °C
0
-1
μF
VINH = 5 V, TJ = -40 to 125 °C
5
15
eN
Output noise
voltage
BW = 300 Hz to 50 KHz, CO = 10 µF
160
µVRMS
TSHDN
Thermal
shutdown
170
°C
Notes:
(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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Typical performance characteristics
LD2981
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DocID6279 Rev 17
6 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: Dropout voltage vs temperature
Figure 6: Line regulation vs temperature
Figure 7: Load regulation vs temperature
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LD2981
Typical performance characteristics
DocID6279 Rev 17
13/27
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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Typical performance characteristics
LD2981
14/27
DocID6279 Rev 17
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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LD2981
Typical performance characteristics
DocID6279 Rev 17
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Figure 20: Load transient response
Figure 21: Line transient response
Application notes
LD2981
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DocID6279 Rev 17
7 Application notes
7.1 External capacitors
Like any low-dropout regulator, the LD2981 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.
7.2 Input capacitor
An input capacitor whose value is 1 μF is required with the LD2981 (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 LD2981 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: "Best
case: highest output version" and Figure 19: "Worst case: lowest output version" 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: "Best case:
highest output version" and Figure 19: "Worst case: lowest output version" 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 and below the specified thresholds listed in the electrical characteristics section
under VIH VIL. Any slew rate can be used to drive the inhibit.
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LD2981
Application notes
DocID6279 Rev 17
17/27
7.6 Reverse current
The power transistor used in the LD2981 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:
"Reverse current test circuit", 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 kΩ and 51.150 kΩ.
Figure 22: Reverse current test circuit
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Package information
LD2981
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DocID6279 Rev 17
8 Package information
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.
8.1 SOT-89 package information
Figure 23: SOT-89 package outline
LD2981
Package information
DocID6279 Rev 17
19/27
Table 6: SOT-89 mechanical data
Dim.
mm
Min.
Typ.
Max.
A
1.40
1.60
B
0.44
0.56
B1
0.36
0.48
C
0.35
0.44
C1
0.35
0.44
D
4.40
4.60
D1
1.62
1.83
D3
0.90
E
2.29
2.60
e
1.42
1.57
e1
2.92
3.07
H
3.94
4.25
H1
2.70
3.10
K
1°
8°
L
0.89
120
R
0.25
β
90°
Uh 2.45 0.57 (x2) 4.35 0.65 momma
Package information
LD2981
20/27
DocID6279 Rev 17
Figure 24: SOT-89 recommended footprint
TOP COVER TAPE “a K0 Ao P7 711175275
LD2981
Package information
DocID6279 Rev 17
21/27
8.2 SOT-89 packing information
Figure 25: SOT-89 carrier tape outline
Table 7: SOT-89 carrier tape mechanical data
Dim.
mm
Value
Tolerance
Ao
4.91
± 0.10
Bo
4.52
± 0.10
Ko
1.90
± 0.10
F
5.50
± 0.10
E
1.75
± 0.10
W
12
± 0.30
P2
2
± 0.10
Po
4
± 0.10
P1
8
± 0.10
T
0.30
± 0.10
D
Ø 1.55
± 0.05
D1
Ø 1.60
± 0.10
Package information
LD2981
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DocID6279 Rev 17
8.3 SOT23-5L package information
Figure 26: SOT23-5L package outline
Table 8: SOT23-5L package mechanical data
Dim.
mm
Min.
Typ.
Max.
A
0.90
1.45
A1
0
0.15
A2
0.90
1.30
b
0.30
0.50
c
0.09
0.20
D
2.95
E
1.60
e
0.95
H
2.80
L
0.30
0.60
θ
0°
8°
3‘ U 110 4L 0‘95 L
LD2981
Package information
DocID6279 Rev 17
23/27
Figure 27: SOT23-5L recommended footprint
Dimensions are in mm
Package information
LD2981
24/27
DocID6279 Rev 17
8.4 SOT23-5L packing information
Figure 28: SOT23-5L tape and reel outline
Table 9: SOT23-5L tape and reel mechanical data
Dim.
mm
Min.
Typ.
Max.
A
180
C
12.8
13.0
13.2
D
20.2
N
60
T
14.4
Ao
3.13
3.23
3.33
Bo
3.07
3.17
3.27
Ko
1.27
1.37
1.47
Po
3.9
4.0
4.1
P
3.9
4.0
4.1
Bo
Ko Ao
Po
P
D
AN
T
LD2981
Ordering information
DocID6279 Rev 17
25/27
9 Ordering information
Table 10: Order codes
AB version
C version
Output voltage
SOT23-5L
SOT-89
SOT23-5L
SOT-89
LD2981CM25TR
2.5 V
LD2981ABM30TR
LD2981CM30TR
3.0 V
LD2981ABM33TR
LD2981ABU33TR
LD2981CM33TR
LD2981CU33TR
3.3 V
LD2981ABM50TR
LD2981ABU50TR
LD2981CM33TR
LD2981CU50TR
5.0 V
Revision history
LD2981
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DocID6279 Rev 17
10 Revision history
Table 11: Document revision history
Date
Revision
Changes
25-Jul-2006
12
Order codes updated.
14-Feb-2008
13
Added: Table 1 on page 1.
14-Jul-2008
14
Modified: Table 1 on page 1 and Table 10 on page 23.
25-Nov-2013
15
Document name changed from LD2981ABxx and
LD2981Cxx to LD2981. Updated Table 4 and Table 5.
Updated Section 8: Package information and Section
8.4: SOT-89 packing information. Minor text changes
in title, in features and description in cover page.
16-Mar-2015
16
Updated Section 8: Package information. Minor text
changes.
01-Apr-2016
17
Updated Section 8: "Package information".
Minor text changes.
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27/27
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