LD2980ABU30TR [STMICROELECTRONICS]
VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT LOW ESR OUTPUT CAPACITORS COMPATIBLE; 带禁止低ESR输出电容器兼容非常低的压差稳压器
| 型号： | LD2980ABU30TR |
| 厂家： | 
ST |
| 描述： | VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT LOW ESR OUTPUT CAPACITORS COMPATIBLE |
| 文件： | 总17页 (文件大小：417K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LD2980
SERIES
ULTRA LOW DROP VOLTAGE REGULATORS WITH INHIBIT
LOW ESR OUTPUT CAPACITORS COMPATIBLE
■
■
STABLE WITH LOW ESR CERAMIC
CAPACITORS
ULTRA LOW DROPOUT VOLTAGE (0.12V
TYP. AT 50mA LOAD, 7mV TYP. AT 1mA
LOAD)
■
VERY LOW QUIESCENT CURRENT (80µA
TYP. AT NO LOAD IN ON MODE; MAX 1µA
IN OFF MODE)
■
■
■
GUARANTEED OUTPUT CURRENT UP TO
50mA
LOGIC-CONTROLLED ELECTRONIC
SHUTDOWN
OUTPUT VOLTAGE OF 1.5; 1.8; 2.5; 2.85;
3.0; 3.2; 3.3; 3.6; 3.8; 4.0; 4.7; 4.85; 5.0V
INTERNAL CURRENT AND THERMAL LIMIT
± 0.5% TOLERANCE OUTPUT VOLTAGE
AVAILABLE (A VERSION)
SOT23-5L
SOT-89
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
1µA 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 LD2980 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.
■
■
■
OUTPUT LOW NOISE VOLTAGE 160µVRMS
TEMPERATURE RANGE: -40 TO 125°C
SMALLEST PACKAGE SOT23-5L AND
SOT-89
FAST DYNAMIC RESPONSE TO LINE AND
LOAD CHANGES
■
DESCRIPTION
The LD2980 series are 50mA fixed-output voltage
regulator. The low drop-voltage and the ultra low
SCHEMATIC DIAGRAM
September 2003
1/17
LD2980 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
DC Input Voltage
INHIBIT Input Voltage
Output Current
-0.3 to 16
-0.3 to 16
V
V
I
V
INH
I
Internally limited
Internally limited
-55 to 150
O
P
Power Dissipation
D
T
Storage Temperature Range
°C
°C
STG
T
Operating Junction Temperature Range
-40 to 125
OP
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
Symbol
Parameter
Thermal Resistance Junction-case
Thermal Resistance Junction-ambient
SOT23-5L
SOT-89
Unit
R
81
15
°C/W
°C/W
thj-case
R
255
110
thj-amb
CONNECTION DIAGRAM (top view)
SOT23-5L
SOT-89
PIN DESCRIPTION
Pin N°
SOT23-5L
Pin N°
SOT-89
Symbol
Name and Function
1
3
2
V
Input Port
IN
2
3
GND
Ground Pin
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 0.18V
4
5
NC
Not Connected
Output Port
1
V
OUT
2/17
LD2980 SERIES
ORDERING CODES
AB VERSION
C VERSION
OUTPUT
VOLTAGES
SOT23-5L
SOT-89
SOT23-5L
SOT-89
LD2980CM15TR
LD2980CM18TR
LD2980CM25TR
LD2980CM28TR
LD2980CM30TR
LD2980CM32TR
LD2980CM33TR
LD2980CM36TR
LD2980CM38TR
LD2980CM40TR
LD2980CM47TR
LD2980CM48TR
LD2980CM50TR
LD2980CU15TR
LD2980CU18TR
LD2980CU25TR
LD2980CU28TR
LD2980CU30TR
LD2980CU32TR
LD2980CU33TR
LD2980CU36TR
LD2980CU38TR
LD2980CU40TR
LD2980CU47TR
LD2980CU48TR
LD2980CU50TR
1.5 V
1.8 V
2.5 V
2.85 V
3.0 V
3.2 V
3.3 V
3.6 V
3.8 V
4.0 V
4.7 V
4.85 V
5.0 V
LD2980ABM25TR
LD2980ABM28TR
LD2980ABM30TR
LD2980ABM32TR
LD2980ABM33TR
LD2980ABM36TR
LD2980ABM38TR
LD2980ABM40TR
LD2980ABM47TR
LD2980ABM48TR
LD2980ABM50TR
LD2980ABU25TR
LD2980ABU28TR
LD2980ABU30TR
LD2980ABU32TR
LD2980ABU33TR
LD2980ABU36TR
LD2980ABU38TR
LD2980ABU40TR
LD2980ABU47TR
LD2980ABU48TR
LD2980ABU50TR
TYPICAL 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 0.18V.
3/17
LD2980 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2980AB (T = 25°C, V = V
+1V, C = 1µF(X7R),
I
j
I
O(NOM)
C
= 2.2µF(X7R), I = 1mA, V = 2V, unless otherwise specified)
INH
O
O
Symbol
Parameter
Operating Input Voltage
Output Voltage
Test Conditions
Min.
2.5
Typ.
Max.
16
Unit
V
V
OP
V
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
= 1 mA
2.487
2.481
2.437
2.835
2.828
2.779
2.985
2.978
2.925
3.184
3.176
3.12
2.5
2.513
2.519
2.562
2.864
2.871
2.921
3.015
3.023
3.075
3.216
3.224
3.28
V
O
O
O
O
O
O
O
O
O
O
O
O
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
O
T = -40 to 125°C
O
O
O
O
O
O
O
O
O
O
O
O
J
V
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Line Regulation
2.85
3
V
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
V
V
V
V
V
V
V
V
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
3.2
3.3
3.6
3.8
4
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
3.284
3.275
3.217
3.582
3.573
3.51
3.317
3.325
3.383
3.618
3.627
3.690
3.819
3.829
3.895
4.02
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
J
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
3.781
3.772
3.705
3.98
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
3.97
4.03
3.9
4.1
T = -40 to 125°C
J
4.677
4.665
4.582
4.826
4.814
4.729
4.975
4.963
4.875
4.7
4.85
5
4.724
4.735
4.818
4.874
4.886
4.971
5.025
5.038
5.125
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
O
O
O
O
J
V
= 1 to 50 mA
= 1 to 50 mA
T = -40 to 125°C
J
∆V
V
+ 1 < V < 16 V
I = 1 mA
O
0.003 0.014
0.032
%/V
O
O(NOM)
IN
T = -40 to 125°C
J
4/17
LD2980 SERIES
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
100
150
150
200
250
450
700
1200
Unit
I
Quiescent Current
ON MODE
I
I
I
I
I
I
I
I
= 0
80
µA
Q
O
O
O
O
O
O
O
= 0
T = -40 to 125°C
J
= 1 mA
= 1 mA
= 10 mA
= 10 mA
= 50 mA
= 50 mA
100
175
500
0
T = -40 to 125°C
J
T = -40 to 125°C
J
T = -40 to 125°C
O
J
OFF MODE
V
< 0.18 V
INH
1
3
V
< 0.18 V
T = -40 to 125°C
INH
J
V
Dropout Voltage (NOTE 1)
I
I
I
I
I
I
I
I
= 0
1
mV
DROP
O
O
O
O
O
O
O
O
5
= 0
T = -40 to 125°C
J
= 1mA
7
10
15
60
90
150
225
= 1mA
T = -40 to 125°C
J
= 10mA
= 10mA
= 50mA
= 50mA
40
120
T = -40 to 125°C
J
T = -40 to 125°C
J
I
Short Circuit Current
R = 0
150
63
mA
dB
V
SC
L
SVR Supply Voltage Rejection
C
= 10µF
f = 1KHz
O
V
Inhibit Input Logic Low
Inhibit Input Logic High
Inhibit Input Current
0.8
1.3
0
0.18
LOW = Output OFF
HIGH = Output ON
T = -40 to 125°C
INH
J
V
I
1.6
V
T = -40 to 125°C
INL
J
-1
µA
V
V
B
= 0V
= 5V
T = -40 to 125°C
INH
INH
INH
J
5
15
T = -40 to 125°C
J
e
Output Noise Voltage
Thermal Shutdown
= 300 Hz to 50 KHz
C
= 10 µF
160
170
µV
RMS
N
W
O
T
°C
SHDN
(NOTE 1): For Vo < 2.5V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
5/17
LD2980 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2980C (T = 25°C, V = V
+1V, C = 1µF(X7R),
I
j
I
O(NOM)
C
= 2.2µF(X7R), I = 1mA, V = 2V, unless otherwise specified)
INH
O
O
Symbol
Parameter
Operating Input Voltage
Output Voltage
Test Conditions
Min.
Typ.
Max.
16
Unit
V
V
2.5
OP
V
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
= 1 mA
1.478
1.470
1.445
1.782
1.773
1.737
2.475
2.463
2.412
2.822
2.807
2.75
1.5
1.522
1.530
1.555
1.818
1.827
1.863
2.525
2.538
2.587
2.879
2.893
2.949
3.03
V
O
O
O
O
O
O
O
O
O
O
O
O
O
O
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
O
T = -40 to 125°C
O
O
O
O
O
O
O
O
O
O
O
O
J
V
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
1.8
2.5
2.85
3
V
V
V
V
V
V
V
V
V
V
V
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
V
V
V
V
V
V
V
V
V
V
V
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
2.97
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
2.955
2.895
3.168
3.152
3.088
3.267
3.251
3.184
3.564
3.546
3.474
3.76
3.045
3.105
3.232
3.248
3.312
3.333
3.35
T = -40 to 125°C
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
J
3.2
3.3
3.6
3.8
4
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
3.415
3.636
3.654
3.726
3.838
3.857
3.933
4.04
T = -40 to 125°C
J
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
3.743
3.667
3.96
T = -40 to 125°C
J
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
3.94
4.06
3.86
4.14
T = -40 to 125°C
O
O
O
O
O
O
O
O
O
O
J
4.653
4.630
4.535
4.802
4.777
4.68
4.7
4.85
5
4.747
4.771
4.864
4.899
4.923
5.02
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
= 1 to 50 mA
= 1 to 50 mA
= 1 mA
T = -40 to 125°C
J
4.95
5.05
= 1 to 50 mA
= 1 to 50 mA
4.925
4.825
5.075
5.175
T = -40 to 125°C
J
6/17
LD2980 SERIES
Symbol
∆V
Parameter
Line Regulation
Test Conditions
+ 1 < V < 16 V
Min.
Typ.
Max.
Unit
V
I = 1 mA
O
0.003 0.014
0.032
%/V
O
O(NOM)
IN
T = -40 to 125°C
J
I
Quiescent Current
ON MODE
I
I
I
I
I
I
I
I
= 0
80
100
175
500
0
100
150
150
200
250
450
700
1200
µA
Q
O
O
O
O
O
O
O
= 0
T = -40 to 125°C
J
= 1 mA
= 1 mA
= 10 mA
= 10 mA
= 50 mA
= 50 mA
T = -40 to 125°C
J
T = -40 to 125°C
J
T = -40 to 125°C
O
J
OFF MODE
V
< 0.18 V
INH
1
3
V
< 0.18 V
T = -40 to 125°C
INH
J
V
Dropout Voltage (NOTE 1)
I
I
I
I
I
I
I
I
= 0
1
mV
DROP
O
O
O
O
O
O
O
O
5
= 0
T = -40 to 125°C
J
= 1mA
7
10
15
60
90
150
225
= 1mA
T = -40 to 125°C
J
= 10mA
= 10mA
= 50mA
= 50mA
40
120
T = -40 to 125°C
J
T = -40 to 125°C
J
I
Short Circuit Current
R = 0
150
63
mA
dB
V
SC
L
SVR Supply Voltage Rejection
C
= 10µF
f = 1KHz
O
V
Inhibit Input Logic Low
Inhibit Input Logic High
Inhibit Input Current
0.8
1.3
0
0.18
LOW = Output OFF
HIGH = Output ON
T = -40 to 125°C
INH
J
V
I
1.6
V
T = -40 to 125°C
INL
J
-1
µA
V
V
B
= 0V
= 5V
T = -40 to 125°C
INH
INH
INH
J
5
15
T = -40 to 125°C
J
e
Output Noise Voltage
Thermal Shutdown
= 300 Hz to 50 KHz
C
= 10 µF
160
170
µV
RMS
N
W
O
T
°C
SHDN
(NOTE 1): For Vo < 2.5V dropout voltage can be calculated according to the minimum input voltage in full temperature range.
7/17
LD2980 SERIES
TYPICAL PERFORMANCE CHARACTERISTICS (T = 25°C, V = V
+1V, C = 1µF(X7R),
I
j
I
O(NOM)
C
= 2.2µF(X7R), V
= 2V, unless otherwise specified)
INH
O
Figure 1 : Output Voltage vs Temperature
Figure 2 : Output Voltage vs Temperature
Figure 3 : Line Regulation vs Temperature
Figure 4 : Load Regulation vs Temperature
Figure 5 : Dropout Voltage vs Temperature
Figure 6 : Quiescent Current vs Temperature
8/17
LD2980 SERIES
Figure 7 : Quiescent Current vs Output
Figure 10 : Dropout Voltage vs Output Current
Current
Figure 8 : OFF MODE Quiescent Current vs
Figure 11 : Inhibit Input Current vs Temperature
Temperature
Figure 9 : Quiescent Current vs Input Voltage
Figure 12 : Inhibit Voltage vs Temperature
9/17
LD2980 SERIES
Figure 13 : Supply Voltage Rejection vs
Figure 16 : Worst Case: Lowest Output Version
Frequency
Figure 14 : Noise Voltage vs Frequency
Figure 17 : Load Transient Response
V
= 4.7V, I = 1 to 100mA, C = 4.7µF X7R
O O
O
Figure 15 : Best Case: Highest Output Version
Figure 18 : Line Transient Response
V = (V
+ 1V), V = 4.7V, I = 100mA, C = 4.7µF X7R
O O O
I
O(NOM)
10/17
LD2980 SERIES
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. We suggest to solder input and output capacitors as close as possible to the relative pins.
INPUT CAPACITOR
An input capacitor whose value is 1µF 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 figures 1 and 2 show the allowable ESR range as a function of the output
capacitance. These curves represent the stability region over the full temperature and I range. Due to
O
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 1µF for output voltages equal or major than
3.8V, 2.2µF for output voltages from 2.85 to 3.3V, and 3.3µF 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 Figure1 & Figure2 to choose the right value according to the used version
and keeping in account that the ESR of ceramic capacitors has been measured @ 100KHz).
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 1µA. When the inhibit feature is not used, this pin must be tied to V to
I
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 V . Any slew rate can be used to drive the inhibit.
IH IL
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
voltage is applied on the output, the reverse current measured,
REV
according to the test circuit in figure 19, flows to the GND across the two feedback resistors. This current
typical value is 160µA. R and R resistors are implanted type; typical values are, respectively, 42.6 KΩ
1
2
and 51.150 KΩ.
11/17
LD2980 SERIES
Figure 19 : Reverse Current Test Circuit
12/17
LD2980 SERIES
SOT23-5L MECHANICAL DATA
mm.
mils
DIM.
MIN.
0.90
0.00
0.90
0.35
0.09
2.80
1.50
TYP
MAX.
1.45
0.10
1.30
0.50
0.20
3.00
1.75
MIN.
35.4
0.0
TYP.
MAX.
57.1
3.9
A
A1
A2
b
35.4
13.7
3.5
51.2
19.7
7.8
C
D
E
110.2
59.0
118.1
68.8
e
0.95
37.4
H
L
2.60
0.10
3.00
0.60
102.3
3.9
118.1
23.6
.
7049676C
13/17
LD2980 SERIES
SOT-89 MECHANICAL DATA
mm.
mils
TYP.
DIM.
MIN.
1.4
TYP
MAX.
1.6
MIN.
55.1
17.3
14.2
13.8
13.8
173.2
63.8
90.2
55.9
115.0
155.1
35.0
MAX.
63.0
A
B
0.44
0.36
0.35
0.35
4.4
0.56
0.48
0.44
0.44
4.6
22.0
B1
C
18.9
17.3
C1
D
17.3
181.1
72.0
D1
E
1.62
2.29
1.42
2.92
3.94
0.89
1.83
2.6
102.4
61.8
e
1.57
3.07
4.25
1.2
e1
H
120.9
167.3
47.2
L
P025H
14/17
LD2980 SERIES
Tape & Reel SOT23-xL MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
180
MIN.
MAX.
7.086
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
14.4
3.33
3.27
1.47
4.1
0.567
0.131
0.128
0.0.58
0.161
0.161
Ao
Bo
Ko
Po
P
3.13
3.07
1.27
3.9
3.23
3.17
1.37
4.0
0.123
0.120
0.050
0.153
0.153
0.127
0.124
0.054
0.157
0.157
3.9
4.0
4.1
15/17
LD2980 SERIES
Tape & Reel SOT89 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
180
MIN.
MAX.
7.086
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
14.4
4.90
4.50
1.90
4.1
0.567
0.193
0.177
0.075
0.161
0.319
Ao
Bo
Ko
Po
P
4.70
4.30
1.70
3.9
4.80
4.40
1.80
4.0
0.185
0.169
0.067
0.153
0.311
0.189
0.173
0.071
0.157
0.315
7.9
8.0
8.1
16/17
LD2980 SERIES
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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17/17
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