July 2008 Rev 17 1/23
23
LD2980ABxx
LD2980Cxx
Ultra low drop voltage regulators compatible
with low ESR inhibit output capacitors
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; 3.6; 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 and SOT-89
Fast dynamic response to line and load
changes
Description
The low drop-voltage and the ultra low quiescent
current make them suitable for low noise, low
power applications and in battery
poweredsystems. 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.
SOT-89
SOT23-5L
Table 1. Device summary
Part numbers
AB Version C Version Output voltage
LD2980CXX18 1.8 V
LD2980ABXX30 3.0 V
LD2980ABXX33 LD2980CXX33 3.3 V
LD2980ABXX36 LD2980CXX36 3.6 V
LD2980ABXX50 LD2980CXX50 5.0 V
www.st.com
LD2980ABxx - LD2980Cxx
2/23
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1 External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2 Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.3 Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.4 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.5 Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.6 Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
LD2980ABxx - LD2980Cxx Diagram
3/23
1 Diagram
Figure 1. Schematic diagram
Pin configuration LD2980ABxx - LD2980Cxx
4/23
2 Pin configuration
Figure 2. Pin connections (top view)
TO-92
SOT23-5L
Table 2. Pin description
Pin n°
SOT23-5L
Pin n°
SOT-89 Symbol Name and Function
13V
IN Input port
2 2 GND Ground pin
3INHIBIT
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
51V
OUT Output port
Table 3. 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
LD2980ABxx - LD2980Cxx Maximum ratings
5/23
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
VIDC input voltage -0.3 to 16 V
VINH INHIBIT input voltage -0.3 to 16 V
IOOutput current Internally limited
PDPower dissipation Internally limited
TSTG Storage temperature range -55 to 150 °C
TOP Operating junction temperature range -40 to 125 °C
Typical application LD2980ABxx - LD2980Cxx
6/23
4 Typical application
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.
Figure 3. Application circuit
LD2980ABxx - LD2980Cxx Electrical characteristics
7/23
5 Electrical characteristics
Table 5. Electrical characteristics for LD2980AB (TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF(X7R),
CO = 2.2 µF (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified).
Symbol Parameter Test conditions Min. Typ. Max. Unit
VOP Operating input voltage 2.5 16 V
VOOutput voltage
IO = 1 mA 2.487 2.5 2.513
VIO = 1 to 50 mA 2.481 2.519
IO = 1 to 50 mA, TJ= -40 to 125°C 2.437 2.562
VOOutput voltage
IO = 1 mA 2.835 2.85 2.864
VIO = 1 to 50 mA 2.828 2.871
IO = 1 to 50 mA, TJ= -40 to 125°C 2.779 2.921
VOOutput voltage
IO = 1 mA 2.985 3 3.015
VIO = 1 to 50 mA 2.978 3.023
IO = 1 to 50 mA, TJ= -40 to 125°C 2.925 3.075
VOOutput voltage
IO = 1 mA 3.184 3.2 3.216
VIO = 1 to 50 mA 3.176 3.224
IO = 1 to 50 mA, TJ= -40 to 125°C 3.12 3.28
VOOutput voltage
IO = 1 mA 3.284 3.3 3.317
VIO = 1 to 50 mA 3.275 3.325
IO = 1 to 50 mA, TJ= -40 to 125°C 3.217 3.383
VOOutput voltage
IO = 1 mA 3.582 3.6 3.618
VIO = 1 to 50 mA 3.573 3.627
IO = 1 to 50 mA, TJ= -40 to 125°C 3.51 3.690
VOOutput voltage
IO = 1 mA 3.781 3.8 3.819
VIO = 1 to 50 mA 3.772 3.829
IO = 1 to 50 mA, TJ= -40 to 125°C 3.705 3.895
VOOutput voltage
IO = 1 mA 3.98 4 4.02
VIO = 1 to 50 mA 3.97 4.03
IO = 1 to 50 mA, TJ= -40 to 125°C 3.9 4.1
VOOutput voltage
IO = 1 mA 4.677 4.7 4.724
VIO = 1 to 50 mA 4.665 4.735
IO = 1 to 50 mA, TJ= -40 to 125°C 4.582 4.818
VOOutput voltage
IO = 1 mA 4.826 4.85 4.874
VIO = 1 to 50 mA 4.814 4.886
IO = 1 to 50 mA, TJ= -40 to 125°C 4.729 4.971
VOOutput voltage
IO = 1 mA 4.975 5 5.025
VIO = 1 to 50 mA 4.963 5.038
IO = 1 to 50 mA, TJ= -40 to 125°C 4.875 5.125
ΔVOLine regulation VO(NOM) + 1 < VIN < 16 V, IO = 1 mA 0.003 0.014 %/V
TJ= -40 to 125°C 0.032
Electrical characteristics LD2980ABxx - LD2980Cxx
8/23
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 = 10 mA 175 250
IO = 10 mA, TJ= -40 to 125°C 450
IO = 50 mA 500 700
IO = 50 mA, TJ= -40 to 125°C 1200
OFF MODE VINH < 0.18 V 0
VINH < 0.18 V, TJ= -40 to 125°C 1
VDROP Dropout voltage(1)
IO = 0 1 3
mV
IO = 0, TJ= -40 to 125°C 5
IO = 1mA 7 10
IO = 1mA, TJ= -40 to 125°C 15
IO = 10mA 40 60
IO = 10mA, TJ= -40 to 125°C 90
IO = 50mA 120 150
IO = 50mA, TJ= -40 to 125°C 225
ISC 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 0.18 V
VINL Inhibit input logic high HIGH = Output ON, TJ= -40 to 125°C 1.6 1.3 V
IINH Inhibit input current VINH = 0V, TJ= -40 to 125°C 0 -1 µA
VINH = 5V, TJ= -40 to 125°C 5 15
eNOutput noise voltage BW = 300 Hz to 50 kHz, CO = 10µF 160 µVRMS
TSHDN Thermal shutdown 170 °C
1. For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
Table 5. Electrical characteristics for LD2980AB (continued) (TJ = 25 °C, VI = VO(NOM) +1 V, CI =
1 µF(X7R), CO = 2.2 µF (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified).
Symbol Parameter Test conditions Min. Typ. Max. Unit
LD2980ABxx - LD2980Cxx Electrical characteristics
9/23
Table 6. Electrical characteristics for LD2980C (TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF (X7R),
CO = 2.2 µF (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
VOP Operating input voltage 2.5 16 V
VOOutput voltage
IO = 1 mA 1.478 1.5 1.522
VIO = 1 to 50 mA 1.470 1.530
IO = 1 to 50 mA, TJ= -40 to 125°C 1.445 1.555
VOOutput voltage
IO = 1 mA 1.782 1.8 1.818
VIO = 1 to 50 mA 1.773 1.827
IO = 1 to 50 mA, TJ= -40 to 125°C 1.737 1.863
VOOutput voltage
IO = 1 mA 2.475 2.5 2.525
VIO = 1 to 50 mA 2.463 2.538
IO = 1 to 50 mA, TJ= -40 to 125°C 2.412 2.587
VOOutput voltage
IO = 1 mA 2.822 2.85 2.879
VIO = 1 to 50 mA 2.807 2.893
IO = 1 to 50 mA, TJ= -40 to 125°C 2.75 2.949
VOOutput voltage
IO = 1 mA 2.97 3 3.03
VIO = 1 to 50 mA 2.955 3.045
IO = 1 to 50 mA, TJ= -40 to 125°C 2.895 3.105
VOOutput voltage
IO = 1 mA 3.168 3.2 3.232
VIO = 1 to 50 mA 3.152 3.248
IO = 1 to 50 mA, TJ= -40 to 125°C 3.088 3.312
VOOutput voltage
IO = 1 mA 3.267 3.3 3.333
VIO = 1 to 50 mA 3.251 3.35
IO = 1 to 50 mA, TJ= -40 to 125°C 3.184 3.415
VOOutput voltage
IO = 1 mA 3.564 3.6 3.636
VIO = 1 to 50 mA 3.546 3.654
IO = 1 to 50 mA, TJ= -40 to 125°C 3.474 3.726
VOOutput voltage
IO = 1 mA 3.76 3.8 3.838
VIO = 1 to 50 mA 3.743 3.857
IO = 1 to 50 mA, TJ= -40 to 125°C 3.667 3.933
VOOutput voltage
IO = 1 mA 3.96 4 4.04
VIO = 1 to 50 mA 3.94 4.06
IO = 1 to 50 mA, TJ= -40 to 125°C 3.86 4.14
VOOutput voltage
IO = 1 mA 4.653 4.7 4.747
VIO = 1 to 50 mA 4.630 4.771
IO = 1 to 50 mA, TJ= -40 to 125°C 4.535 4.864
VOOutput voltage
IO = 1 mA 4.802 4.85 4.899
VIO = 1 to 50 mA 4.777 4.923
IO = 1 to 50 mA, TJ= -40 to 125°C 4.68 5.02
Electrical characteristics LD2980ABxx - LD2980Cxx
10/23
VOOutput voltage
IO = 1 mA 4.95 5 5.05
VIO = 1 to 50 mA 4.925 5.075
IO = 1 to 50 mA, TJ= -40 to 125°C 4.825 5.175
ΔVOLine 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 = 10 mA 175 250
IO = 10 mA, TJ= -40 to 125°C 450
IO = 50 mA 500 700
IO = 50 mA, TJ= -40 to 125°C 1200
OFF MODE VINH < 0.18 V 0
VINH < 0.18 V, TJ= -40 to 125°C 1
VDROP Dropout voltage (1)
IO = 0 1 3
mV
IO = 0, TJ= -40 to 125°C 5
IO = 1mA 7 10
IO = 1mA, TJ= -40 to 125°C 15
IO = 10mA 40 60
IO = 10mA, TJ= -40 to 125°C 90
IO = 50mA 120 150
IO = 50mA, TJ= -40 to 125°C 225
ISC 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 0.18 V
VINL Inhibit input logic high HIGH = Output ON, TJ= -40 to 125°C 1.6 1.3 V
IINH Inhibit input current VINH = 0V, TJ= -40 to 125°C 0 -1 µF
VINH = 5V, TJ= -40 to 125°C 5 15
eNOutput noise voltage BW = 300 Hz to 50 kHz, CO = 10µF 160 µVRMS
TSHDN Thermal shutdown 170 °C
1. For VO < 2.5 V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
Table 6. Electrical characteristics for LD2980C (continued) (TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1
µF (X7R), CO = 2.2 µF (X7R), IO = 1 mA, VINH = 2 V, unless otherwise specified)
Symbol Parameter Test conditions Min. Typ. Max. Unit
LD2980ABxx - LD2980Cxx Typical performance characteristics
11/23
6 Typical performance characteristics
(TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF (X7R), CO = 2.2 µF (X7R), 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
Figure 8. Dropout voltage vs temperature Figure 9. Quiescent current vs temperature
Typical performance characteristics LD2980ABxx - LD2980Cxx
12/23
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
Figure 14. Inhibit input current vs temperature Figure 15. Inhibit voltage vs temperature
LD2980ABxx - LD2980Cxx Typical performance characteristics
13/23
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
Figure 20. Load transient response Figure 21. Line transient response
VO = 4.7V, IO = 1 to 100mA, CO = 4.7µF (X7R)
VI = [VO(NOM) +1V], VO = 4.7V, IO = 100mA, CO = 4.7µF
(X7R)
Application notes LD2980ABxx - LD2980Cxx
14/23
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. 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 4 and Figure 5
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 1 and Figure 2 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.
LD2980ABxx - LD2980Cxx Application notes
15/23
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 kΩ and 51.150 kΩ.
Figure 22. Reverse current test circuit
Package mechanical data LD2980ABxx - LD2980Cxx
16/23
8 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.
LD2980ABxx - LD2980Cxx Package mechanical data
17/23
Dim.
mm. mils.
Min. Typ. Max. Min. Typ. Max.
A 1.4 1.6 55.1 63.0
B 0.44 0.56 17.322.0
B1 0.36 0.4814.2 18.9
C0.35 0.44 13.817.3
C1 0.35 0.44 13.817.3
D 4.4 4.6 173.2 181.1
D1 1.62 1.83 63.872.0
E2.292.6 90.2 102.4
e 1.42 1.57 55.961.8
e1 2.923.07 115.0 120.9
H3.94 4.25 155.1 167.3
L0.89 1.2 35.0 47.2
SOT-89 mechanical data
P025H
Package mechanical data LD2980ABxx - LD2980Cxx
18/23
Dim.
mm. mils.
Min. Typ. Max. Min. Typ. Max.
A0.90 1.45 35.4 57.1
A1 0.00 0.10 0.0 3.9
A2 0.90 1.3035.4 51.2
b0.35 0.50 13.7 19.7
C0.090.20 3.5 7.8
D2.803.00 110.2 118.1
E 1.50 1.75 59.0 68.8
e0.9537.4
H 2.60 3.00 102.3118.1
L 0.10 0.60 3.923.6
SOT23-5L mechanical data
7049676D
LD2980ABxx - LD2980Cxx Package mechanical data
19/23
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A180 7.086
C 12.813.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 3.133.233.33 0.1230.127 0.131
Bo 3.07 3.17 3.27 0.120 0.124 0.128
Ko 1.27 1.37 1.47 0.050 0.054 0.0.58
Po 3.94.0 4.1 0.1530.157 0.161
P3.94.0 4.1 0.1530.157 0.161
Tape & reel SOT23-xL mechanical data
Package mechanical data LD2980ABxx - LD2980Cxx
20/23
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A180 7.086
C 12.813.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N60 2.362
T 14.4 0.567
Ao 4.70 4.80 4.90 0.185 0.189 0.193
Bo 4.30 4.40 4.50 0.1690.1730.177
Ko 1.70 1.80 1.90 0.067 0.071 0.075
Po 3.94.0 4.1 0.1530.157 0.161
P7.98.0 8.1 0.311 0.315 0.319
Tape & reel SOT89 mechanical data
LD2980ABxx - LD2980Cxx Order codes
21/23
9 Order codes
Table 7. Order codes
AB Version C Version
Output voltage
SOT23-5L SOT-89 SOT23-5L SOT-89
LD2980CM18TR LD2980CU18TR 1.8 V
LD2980ABM30TR LD2980ABU30TR (1)
1. Available on request.
LD2980CM30TR (1) LD2980CU30TR (1) 3.0 V
LD2980ABM33TR LD2980ABU33TR LD2980CM33TR 3.3 V
LD2980ABM36TR LD2980ABU36TR (1) LD2980CM36TR LD2980CU36TR (1) 3.6 V
LD2980ABM50TR LD2980CM50TR 5.0 V
Revision history LD2980ABxx - LD2980Cxx
22/23
10 Revision history
Table 8. Document revision history
Date Revision Changes
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.
LD2980ABxx - LD2980Cxx
23/23
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