July 2008Rev 171/23
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. T ypical applications are cellular phone, laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
Table 1.
Device summary
Part numbers
AB Version
C Version Output voltage
LD2980CXX18
1.8 V LD2980ABXX30 3.0 V LD2980ABXX33LD2980CXX33 3.3 V LD2980ABXX36LD2980CXX36 3.6 V LD2980ABXX50
LD2980CXX50
5.0 V
https://www.wendangku.net/doc/e614164417.html,
LD2980ABxx - LD2980Cxx
Contents
1Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.3Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.4Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.5Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.6Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 10Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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LD2980ABxx - LD2980Cxx Diagram 1 Diagram
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Pin configuration
LD2980ABxx - LD2980Cxx
4/23
2
Pin configuration
Table 2.
Pin description
Pin n°SOT23-5L
Pin n°SOT -89Symbol Name and Function
13V IN Input port 22
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 4NC
Not connected 5
1
V OUT
Output port
Table 3.
Thermal data
Symbol Parameter
SOT23-5L
SOT-89Unit R thJC Thermal resistance junction-case 8115°C/W R thJA
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 V I DC input voltage -0.3 to 16V V INH INHIBIT input voltage -0.3 to 16V
I O Output current Internally limited P D Power dissipation
Internally limited T STG Storage temperature range
-55 to 150°C T OP
Operating junction temperature range
-40 to 125
°C
Typical application LD2980ABxx - LD2980Cxx 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.
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LD2980ABxx - LD2980Cxx
Electrical characteristics
7/23
5 Electrical characteristics
Table 5.
Electrical characteristics for LD2980AB (T J = 25 °C, V I = V O(NOM) +1 V , C I = 1 μF(X7R),
C O = 2.2 μF (X7R), I O = 1 mA, V INH = 2 V , unless otherwise specified).
Symbol Parameter
Test conditions
Min.Typ.
Max.Unit V OP Operating input voltage
2.516V
V O
Output voltage
I O = 1 mA
2.487 2.5 2.513V I O = 1 to 50 mA
2.481 2.519I O = 1 to 50 mA, T J = -40 to 125°C 2.437 2.562V O
Output voltage
I O = 1 mA
2.835 2.85 2.864V I O = 1 to 50 mA
2.828 2.871I O = 1 to 50 mA, T J = -40 to 125°C 2.779 2.921V O
Output voltage
I O = 1 mA
2.9853
3.015V I O = 1 to 50 mA
2.978
3.023I O = 1 to 50 mA, T J = -40 to 125°C 2.925 3.075V O
Output voltage
I O = 1 mA
3.184 3.2 3.216V I O = 1 to 50 mA
3.176 3.224I O = 1 to 50 mA, T J = -40 to 125°C 3.12 3.28V O
Output voltage
I O = 1 mA
3.284 3.3 3.317V I O = 1 to 50 mA
3.275 3.325I O = 1 to 50 mA, T J = -40 to 125°C 3.217 3.383V O
Output voltage
I O = 1 mA
3.582 3.6 3.618V I O = 1 to 50 mA
3.573 3.627I O = 1 to 50 mA, T J = -40 to 125°C 3.51 3.690V O
Output voltage
I O = 1 mA
3.781 3.8 3.819V I O = 1 to 50 mA
3.772 3.829I O = 1 to 50 mA, T J = -40 to 125°C 3.705 3.895V O
Output voltage
I O = 1 mA
3.984
4.02V I O = 1 to 50 mA
3.97
4.03I O = 1 to 50 mA, T J = -40 to 125°C 3.9 4.1V O
Output voltage
I O = 1 mA
4.677 4.7 4.724V I O = 1 to 50 mA
4.665 4.735I O = 1 to 50 mA, T J = -40 to 125°C 4.582 4.818V O
Output voltage
I O = 1 mA
4.826 4.85 4.874V I O = 1 to 50 mA
4.814 4.886I O = 1 to 50 mA, T J = -40 to 125°C 4.729 4.971V O
Output voltage
I O = 1 mA
4.9755
5.025V I O = 1 to 50 mA
4.963
5.038I O = 1 to 50 mA, T J = -40 to 125°C 4.875
5.125ΔV O
Line regulation
V O(NOM) + 1 < V IN < 16 V , I O = 1 mA 0.0030.014%/V T J = -40 to 125°C
0.032
Electrical characteristics LD2980ABxx - LD2980Cxx
8/23
I Q
Quiescent current ON MODE
I O = 0
80
100μA I O = 0, T J = -40 to 125°C 150I O = 1 mA
100
150I O = 1 mA, T J = -40 to 125°C 200I O = 10 mA
175250I O = 10 mA, T J = -40 to 125°C 450I O = 50 mA
500700I O = 50 mA, T J = -40 to 125°C
1200
OFF MODE
V INH < 0.18 V
V INH < 0.18 V , T J = -40 to 125°C 1V DROP
Dropout voltage (1)
I O = 0
13mV
I O = 0, T J = -40 to 125°C 5I O = 1mA
710I O = 1mA, T J = -40 to 125°C 15I O = 10mA
4060I O = 10mA, T J = -40 to 125°C 90I O = 50mA
120150I O = 50mA, T J = -40 to 125°C
225
I SC Short circuit current R L = 0
150mA SVR Supply voltage rejection C O = 10μF , f = 1kHz
63dB V INH Inhibit input logic low LOW = Output OFF , T J = -40 to 125°C 0.8
0.18
V V INL Inhibit input logic high HIGH = Output ON, T J = -40 to 125°C 1.6
1.3V I INH Inhibit input current V INH = 0V , T J = -40 to 125°C 0-1μA V INH = 5V , T J = -40 to 125°C 515e N Output noise voltage B W = 300 Hz to 50 kHz, C O = 10μF
160μV RMS T SHDN
Thermal shutdown
170
°C 1.For V O < 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) (T J = 25 °C, V I = V O(NOM) +1 V, C I = 1 μF(X7R), C O = 2.2 μF (X7R), I O = 1 mA, V INH = 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 (T J = 25 °C, V I = V O(NOM) +1 V , C I = 1 μF (X7R), C O = 2.2 μF (X7R), I O = 1 mA, V INH = 2 V , unless otherwise specified)
Symbol Parameter
Test conditions
Min.Typ.
Max.Unit V OP Operating input voltage
2.516V
V O
Output voltage
I O = 1 mA
1.478 1.5 1.522V I O = 1 to 50 mA
1.470 1.530I O = 1 to 50 mA, T J = -40 to 125°C 1.445 1.555V O
Output voltage
I O = 1 mA
1.782 1.8 1.818V I O = 1 to 50 mA
1.773 1.827I O = 1 to 50 mA, T J = -40 to 125°C 1.737 1.863V O
Output voltage
I O = 1 mA
2.475 2.5 2.525V I O = 1 to 50 mA
2.463 2.538I O = 1 to 50 mA, T J = -40 to 125°C 2.412 2.587V O
Output voltage
I O = 1 mA
2.822 2.85 2.879V I O = 1 to 50 mA
2.807 2.893I O = 1 to 50 mA, T J = -40 to 125°C 2.75 2.949V O
Output voltage
I O = 1 mA
2.973
3.03V I O = 1 to 50 mA
2.955
3.045I O = 1 to 50 mA, T J = -40 to 125°C 2.895 3.105V O
Output voltage
I O = 1 mA
3.168 3.2 3.232V I O = 1 to 50 mA
3.152 3.248I O = 1 to 50 mA, T J = -40 to 125°C 3.088 3.312V O
Output voltage
I O = 1 mA
3.267 3.3 3.333V I O = 1 to 50 mA
3.251 3.35I O = 1 to 50 mA, T J = -40 to 125°C 3.184 3.415V O
Output voltage
I O = 1 mA
3.564 3.6 3.636V I O = 1 to 50 mA
3.546 3.654I O = 1 to 50 mA, T J = -40 to 125°C 3.474 3.726V O
Output voltage
I O = 1 mA
3.76 3.8 3.838V I O = 1 to 50 mA
3.743 3.857I O = 1 to 50 mA, T J = -40 to 125°C 3.667 3.933V O
Output voltage
I O = 1 mA
3.964
4.04V I O = 1 to 50 mA
3.94
4.06I O = 1 to 50 mA, T J = -40 to 125°C 3.86 4.14V O
Output voltage
I O = 1 mA
4.653 4.7 4.747V I O = 1 to 50 mA
4.630 4.771I O = 1 to 50 mA, T J = -40 to 125°C 4.535 4.864V O
Output voltage
I O = 1 mA
4.802 4.85 4.899V I O = 1 to 50 mA
4.777 4.923I O = 1 to 50 mA, T J = -40 to 125°C
4.68
5.02
Electrical characteristics LD2980ABxx - LD2980Cxx
10/23
V O
Output voltage
I O = 1 mA
4.955
5.05V I O = 1 to 50 mA
4.925
5.075I O = 1 to 50 mA, T J = -40 to 125°C 4.825
5.175ΔV O
Line regulation
V O(NOM) + 1 < V IN < 16 V , I O = 1 mA 0.0030.014%/V T J = -40 to 125°C 0.032I Q
Quiescent current ON MODE
I O = 0
80
100μA I O = 0, T J = -40 to 125°C 150I O = 1 mA
100150I O = 1 mA, T J = -40 to 125°C 200I O = 10 mA
175250I O = 10 mA, T J = -40 to 125°C 450I O = 50 mA
500700I O = 50 mA, T J = -40 to 125°C
1200
OFF MODE
V INH < 0.18 V
V INH < 0.18 V , T J = -40 to 125°C 1V DROP
Dropout voltage (1)
I O = 0
13mV
I O = 0, T J = -40 to 125°C 5I O = 1mA
710I O = 1mA, T J = -40 to 125°C 15I O = 10mA
4060I O = 10mA, T J = -40 to 125°C 90I O = 50mA
120150I O = 50mA, T J = -40 to 125°C
225
I SC Short circuit current R L = 0
150mA SVR Supply voltage rejection C O = 10μF , f = 1kHz
63dB V INH Inhibit input logic low LOW = Output OFF , T J = -40 to 125°C 0.8
0.18
V V INL Inhibit input logic high HIGH = Output ON, T J = -40 to 125°C 1.6
1.3V I INH Inhibit input current V INH = 0V , T J = -40 to 125°C 0-1μF V INH = 5V , T J = -40 to 125°C 515e N Output noise voltage B W = 300 Hz to 50 kHz, C O = 10μF
160μV RMS T SHDN
Thermal shutdown
170
°C 1.For V O < 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) (T J = 25 °C, V I = V O(NOM) +1 V , C I = 1 μF (X7R), C O = 2.2 μF (X7R), I O = 1 mA, V INH = 2 V, unless otherwise specified)
Symbol Parameter
Test conditions
Min.Typ.Max.Unit
LD2980ABxx - LD2980Cxx Typical performance characteristics 6 Typical performance characteristics
(T J = 25 °C, V I = V O(NOM) +1 V, C I = 1 μF (X7R), C O = 2.2 μF (X7R), V INH = 2 V, unless
otherwise specified)
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Typical performance characteristics
LD2980ABxx - LD2980Cxx
12/23
Figure 10.Quiescent current vs output
Figure 11.Off mode quiescent current vs
LD2980ABxx - LD2980Cxx
Typical performance characteristics
13/23
Figure 16.Supply voltage rejection vs
Figure 17.Noise voltage vs frequency
Figure 20.Load transient response
Figure 21.Line transient response
V O = 4.7V, I O = 1 to 100mA, C O = 4.7μF (X7R)
V I = [V O(NOM) +1V], V O = 4.7V, I O = 100mA, C O = 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 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 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 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 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.
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 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 Ω and 51.150 k Ω.
Package mechanical data LD2980ABxx - LD2980Cxx 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: https://www.wendangku.net/doc/e614164417.html,.
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LD2980ABxx - LD2980Cxx Package mechanical data
Package mechanical data LD2980ABxx - LD2980Cxx
LD2980ABxx - LD2980Cxx Package mechanical data
Package mechanical data LD2980ABxx - LD2980Cxx