STMicroelectronics LD2982BM27R Very low drop and low noise voltage regulator with inhibit function, low esr capacitors compatible Datasheet

LD2982Axx
LD2982Bxx
Very low drop and low noise voltage regulator with
inhibit function, low ESR capacitors compatible
Features
■
Very low dropout voltage (120 mV at 50 mA
and 7 mV at 1 mA load)
■
Very low quiescent current (375 mA typ. at
50 mA load and 75 mA at 1 mA)
■
Output current up to 50 mA
■
Logic controlled electronic shutdown
■
Output voltage of 1.8, 2.7, 3.2, 3.3 V
■
Internal current and thermal limit
■
Available in ± 1 % tolerance
(at 25 °C, A version)
■
Supply voltage rejection: 45 dB (typ)
■
Only 1 µF for stability
■
Low output noise voltage 30 µVrms
■
Smallest package SOT23-5L
■
Temperature range: -40 °C to 125 °C
SOT23-5L
An external capacitor CBYP = 10 nF connected
between bypass pin and GND reduce the noise
to 30 µVrms.
Typical application are in cellular phone,
palmtop/laptop computer, personal digital
assistant (PDA), personal stereo, camcorder and
camera.
Description
The LD2982A/Bxx is a 50 mA fixed output voltage
regulator. The ultra low drop voltage and the low
quiescent current make them particularly suitable
for low noise, low power applications, and in
battery powered systems. In sleep mode
quiescent current is less than 1 µA when INHIBIT
pin is pulled low. Shutdown logic control function
is available on pin 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.
Table 1.
Device summary
Part numbers
July 2008
A Version
B Version
Output voltage
LD2982AXX18
LD2982BXX18
1.8 V
LD2982AXX27
LD2982BXX27
2.7 V
LD2982AXX32
LD2982BXX32
3.2 V
Rev 6
1/20
www.st.com
20
LD2982Axx - LD2982Bxx
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6
Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1
External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.2
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.3
Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.4
Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.5
Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.6
Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
2/20
LD2982Axx - LD2982Bxx
1
Diagram
Figure 1.
Schematic diagram
Diagram
3/20
Pin configuration
LD2982Axx - LD2982Bxx
2
Pin configuration
Figure 2.
Pin connections (top view)
Table 2.
Pin description
Pin n°
Symbol
1
IN
2
GND
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 0.18V
4
Bypass
Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise
performances
5
OUT
Table 3.
Symbol
4/20
Name and function
Input port
Ground pin
Output port
Thermal data
Parameter
SOT23-5L
Unit
RthJC
Thermal resistance junction-case
81
°C/W
RthJA
Thermal resistance junction-ambient
255
°C/W
LD2982Axx - LD2982Bxx
Maximum ratings
3
Maximum ratings
Table 4.
Absolute maximum ratings
Symbol
VI
VINH
Note:
Parameter
Value
Unit
DC input voltage
16
V
INHIBIT input voltage
16
V
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
TSTG
Storage temperature range
-65 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.
5/20
Electrical characteristics
LD2982Axx - LD2982Bxx
4
Electrical characteristics
Table 5.
Electrical characteristics for LD2982A (TJ = 25 °C, VI = VO + 1 V, IO =1 mA, VSHDN = 2V,
CI = CO = 1 µF, unless otherwise specified).
Symbol
VOP
VO
VO
VO
VO
VO
VO
VO
VO
VO
VO
VO
VO
6/20
Parameter
Test conditions
Operating input voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Min.
Typ.
Max.
Unit
16
V
1.5
1.515
2.5
VI = 2.5V
1.485
IO = 1 to 50mA
1.477
1.523
IO = 1 to 50mA, TJ= -40 to 125°C
1.470
1.530
VI = 2.8V
1.782
IO = 1 to 50mA
1.773
1.827
IO = 1 to 50mA, TJ= -40 to 125°C
1.764
1.836
VI = 3.5V
2.475
1.8
2.5
1.818
V
2.525
IO = 1 to 50mA
2.462
2.537
IO = 1 to 50mA, TJ= -40 to 125°C
2.45
2.55
VI = 3.8V
2.772
IO = 1 to 50mA
2.758
2.8
V
V
2.828
2.842
IO = 1 to 50mA, TJ= -40 to 125°C
2.744
VI = 3.85V
2.821
IO = 1 to 50mA
2.807
2.893
IO = 1 to 50mA, TJ= -40 to 125°C
2.793
2.907
VI = 4.0V
2.970
IO = 1 to 50mA
2.955
3.045
IO = 1 to 50mA, TJ= -40 to 125°C
2.94
3.06
VI = 4.1V
3.069
V
2.856
2.85
3.0
3.1
2.879
3.030
V
3.131
IO = 1 to 50mA
3.053
3.146
IO = 1 to 50mA, TJ= -40 to 125°C
3.038
3.162
VI = 4.2V
3.168
IO = 1 to 50mA
3.152
3.2
V
V
3.232
3.248
IO = 1 to 50mA, TJ= -40 to 125°C
3.136
VI = 4.3V
3.267
IO = 1 to 50mA
3.250
3.349
IO = 1 to 50mA, TJ= -40 to 125°C
3.234
3.366
VI = 4.5V
3.465
IO = 1 to 50mA
3.447
3.552
IO = 1 to 50mA, TJ= -40 to 125°C
3.43
3.57
VI = 4.6V
3.564
V
3.264
3.3
3.5
3.6
3.333
3.535
V
3.636
IO = 1 to 50mA
3.546
3.654
IO = 1 to 50mA, TJ= -40 to 125°C
3.528
3.672
VI = 4.8V
3.762
IO = 1 to 50mA
3.743
3.857
IO = 1 to 50mA, TJ= -40 to 125°C
3.724
3.876
3.8
V
V
3.838
V
LD2982Axx - LD2982Bxx
Table 5.
Symbol
VO
VO
VO
Electrical characteristics
Electrical characteristics for LD2982A (continued) (TJ = 25 °C, VI = VO + 1 V, IO =1 mA,
VSHDN = 2V, CI = CO = 1 µF, unless otherwise specified).
Parameter
Output voltage
Output voltage
Output voltage
Test conditions
Min.
Typ.
Max.
VI = 5.0V
3.96
4
4.04
IO = 1 to 50mA
3.94
IO = 1 to 50mA, TJ= -40 to 125°C
3.92
VI = 5.7V
4.653
IO = 1 to 50mA
4.629
4.77
IO = 1 to 50mA, TJ= -40 to 125°C
4.606
4.794
Short circuit current
4.95
4.925
5.075
4.9
5.1
Line regulation
5
0.003
VI = VO + 1V to 16V, IO = 1 mA,
TJ= -40 to 125°C
3
7
10
Dropout voltage
IO = 1mA, TJ= -40 to 125°C
15
IO = 10mA
40
60
120
150
IO = 10mA, TJ= -40 to 125°C
IO = 50mA, TJ= -40 to 125°C
225
IO = 0
80
IO = 0, TJ= -40 to 125°C
100
IO = 1mA, TJ= -40 to 125°C
IO = 10mA
200
600
IO = 50mA, TJ= -40 to 125°C
VIL
Inhibit input logic low
TJ= -40 to 125°C
VIH
Inhibit input logic high
TJ= -40 to 125°C
IINH
Inhibit input current
eN
Output noise voltage
900
0
VINH<0.18V, TJ= -40 to 125°C
CBYP = 0.01µF, CO = 10µF, f = 1kHz
µA
1200
VINH<0.18V
Supply voltage rejection
300
400
IO = 50mA
SVR
150
200
IO = 10mA, TJ= -40 to 125°C
OFF MODE
100
150
IO = 1mA
IQ
mV
90
IO = 50mA
Quiescent current
ON MODE
%/VI
5
IO = 1mA
VDROP
0.014
1
IO = 0, TJ= -40 to 125°C
V
mA
0.032
IO = 0
V
5.05
150
VI = VO + 1V to 16V, IO = 1 mA
ΔVO/ΔVI
4.747
IO = 1 to 50mA
RL = 0
V
4.08
4.7
VI = 6.0V
IO = 1 to 100 mA, TJ= -40 to 125°C
ISC
4.06
Unit
1
45
dB
0.15
2
V
V
VINH = 0V, TJ= -40 to 125°C
5
15
VINH = 5V, TJ= -40 to 125°C
0
-1
B = 300 Hz to 50 kHz, CBYP = 0.01µF,
CO = 10µF
30
µA
µV
7/20
Electrical characteristics
Table 6.
Symbol
VOP
LD2982Axx - LD2982Bxx
Electrical characteristics for LD2982B (TJ = 25 °C, VI = VO + 1 V, IO = 1 mA, VSHDN = 2 V,
CI = CO = 1 µF, unless otherwise specified).
Parameter
Test conditions
Operating input voltage
VO
VO
VO
VO
VO
VO
VO
VO
VO
VO
VO
8/20
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Output voltage
Typ.
2.5
VI = 2.5V
VO
Min.
1.477
1.5
Max.
Unit
16
V
1.523
IO = 1 to 50mA
1.470
1.530
IO = 1 to 50mA, TJ= -40 to 125°C
1.447
1.553
VI = 2.8V
1.773
IO = 1 to 50mA
1.764
1.8
V
1.827
1.836
IO = 1 to 50mA, TJ= -40 to 125°C
1.737
VI = 3.5V
2.462
IO = 1 to 50mA
2.45
2.55
IO = 1 to 50mA, TJ= -40 to 125°C
2.412
2.587
VI = 3.8V
2.758
IO = 1 to 50mA
2.744
2.856
IO = 1 to 50mA, TJ= -40 to 125°C
2.702
2.898
VI = 3.85V
2.807
V
1.863
2.5
2.8
2.85
2.537
2.842
V
2.893
IO = 1 to 50mA
2.793
2.907
IO = 1 to 50mA, TJ= -40 to 125°C
2.750
2.950
VI = 4.0V
2.955
IO = 1 to 50mA
2.94
3.0
V
V
3.045
3.06
IO = 1 to 50mA, TJ= -40 to 125°C
2.895
VI = 4.1V
3.053
IO = 1 to 50mA
3.038
3.162
IO = 1 to 50mA, TJ= -40 to 125°C
2.991
3.208
VI = 4.2V
3.152
IO = 1 to 50mA
3.136
3.264
IO = 1 to 50mA, TJ= -40 to 125°C
3.088
3.312
VI = 4.3V
3.250
V
3.105
3.1
3.2
3.3
3.146
3.248
V
3.349
IO = 1 to 50mA
3.234
3.366
IO = 1 to 50mA, TJ= -40 to 125°C
3.184
3.415
VI = 4.5V
3.447
IO = 1 to 50mA
3.430
3.5
V
V
3.552
3.370
IO = 1 to 50mA, TJ= -40 to 125°C
3.377
VI = 4.6V
3.546
IO = 1 to 50mA
3.528
3.672
IO = 1 to 50mA, TJ= -40 to 125°C
3.474
3.726
VI = 4.8V
3.743
IO = 1 to 50mA
3.724
3.876
IO = 1 to 50mA, TJ= -40 to 125°C
3.667
3.933
V
3.662
3.6
3.8
3.654
V
3.857
V
LD2982Axx - LD2982Bxx
Table 6.
Symbol
VO
VO
VO
Electrical characteristics
Electrical characteristics for LD2982B (continued) (TJ = 25 °C, VI = VO + 1 V, IO = 1 mA,
VSHDN = 2 V, CI = CO = 1 µF, unless otherwise specified).
Parameter
Output voltage
Output voltage
Output voltage
Test conditions
Min.
Typ.
Max.
VI = 5.0V
3.94
4
4.06
IO = 1 to 50mA
3.92
IO = 1 to 50mA, TJ= -40 to 125°C
3.86
VI = 5.7V
4.629
IO = 1 to 50mA
4.606
4.794
IO = 1 to 50mA, TJ= -40 to 125°C
4.535
4.864
VI = 6.0V
4.925
IO = 1 to 50mA
IO = 1 to 100 mA, TJ= -40 to 125°C
ISC
Short circuit current
Line regulation
5
5.175
400
0.003
VI = VO + 1V to 16V, IO = 1 mA,
TJ= -40 to 125°C
1
3
7
10
IO = 1mA, TJ= -40 to 125°C
15
IO = 10mA
40
60
120
150
IO = 10mA, TJ= -40 to 125°C
IO = 50mA, TJ= -40 to 125°C
80
IO = 0, TJ= -40 to 125°C
100
IO = 1mA, TJ= -40 to 125°C
IO = 10mA
200
IO = 10mA, TJ= -40 to 125°C
600
Inhibit input logic low
TJ= -40 to 125°C
VIH
Inhibit input logic high
TJ= -40 to 125°C
IINH
Inhibit input current
eN
Output noise voltage
900
0
VINH<0.18V, TJ= -40 to 125°C
VIL
µA
1200
VINH<0.18V
CBYP = 0.01µF, CO = 10µF, f = 1kHz
300
400
IO = 50mA, TJ= -40 to 125°C
Supply voltage rejection
150
200
IO = 50mA
SVR
100
150
IO = 1mA
OFF MODE
mV
225
IO = 0
IQ
%/VI
90
IO = 50mA
Quiescent current
ON MODE
0.014
5
IO = 1mA
Dropout voltage
V
mA
0.032
IO = 0, TJ= -40 to 125°C
V
5.075
4.825
IO = 0
VDROP
4.77
5.1
RL = 0
V
4.14
4.7
4.9
VI = VO + 1V to 16V, IO = 1 mA
ΔVO/ΔVI
4.08
Unit
1
45
dB
0.15
2
V
V
VINH = 0V, TJ= -40 to 125°C
5
15
VINH = 5V, TJ= -40 to 125°C
0
-1
B = 300 Hz to 50 kHz, CBYP = 0.01µF,
CO = 10µF
30
µA
µV
9/20
Typical characteristics
LD2982Axx - LD2982Bxx
5
Typical characteristics
Figure 3.
(TJ = 25 °C, VI = VO(NOM) +1 V, CI = 1 µF (X7R), CO = 2.2 µF (X7R), VINH = 2 V, unless
otherwise specified).
Output voltage vs temperature
Figure 4.
Dropout voltage vs temperature
Figure 5.
Dropout voltage vs output current
Figure 6.
Quiescent current vs load current
Figure 7.
Quiescent current vs temperature
Figure 8.
Supply voltage rejection vs temp.
10/20
LD2982Axx - LD2982Bxx
Figure 9.
Supply voltage rejection vs output
current
Typical characteristics
Figure 10. Supply voltage rejection vs output
current
Figure 11. Supply voltage rejection vs
frequency
Figure 12. Supply voltage rejection vs
frequency
Figure 13. Line transient
Figure 14. Line transient
VO = 2.5V, IO = 50mA, no CI, CO = 4.7µF, tr=tf=2ns
VO = 2.5V, IO = 50mA, no CI, CO = 4.7µF, tr=tf=1µs
11/20
Typical characteristics
LD2982Axx - LD2982Bxx
Figure 15. Load transient
Figure 16. Load transient
VO = 2.5V, IO = 0 to 50mA, no CI, CO = 10µF, tr=tf=2ns
VO = 2.5V, IO = 0 to 50mA, no CI, CO = 4.7µF, tr=tf=2ns
12/20
LD2982Axx - LD2982Bxx
6
Application notes
6.1
External capacitors
Application notes
Like any low-dropout regulator, the LD2982 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.
6.2
Input capacitor
An input capacitor whose value is 1 µF is required with the LD2982 (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.
6.3
Output capacitor
The LD2982 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. 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 VO going from 1.8 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.
6.4
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.
6.5
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.
13/20
Application notes
6.6
LD2982Axx - LD2982Bxx
Reverse current
The power transistor used in the LD2982 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 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 17. Reverse current test circuit
14/20
LD2982Axx - LD2982Bxx
7
Package mechanical data
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.
15/20
Package mechanical data
LD2982Axx - LD2982Bxx
SOT23-5L mechanical data
mm.
mils.
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
0.90
1.45
35.4
57.1
A1
0.00
0.10
0.0
3.9
A2
0.90
1.30
35.4
51.2
b
0.35
0.50
13.7
19.7
C
0.09
0.20
3.5
7.8
D
2.80
3.00
110.2
118.1
E
1.50
1.75
59.0
68.8
e
0.95
37.4
H
2.60
3.00
102.3
118.1
L
0.10
0.60
3.9
23.6
7049676D
16/20
LD2982Axx - LD2982Bxx
Package mechanical data
Tape & reel SOT23-xL mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
180
13.0
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Max.
0.504
0.512
14.4
0.519
0.567
Ao
3.13
3.23
3.33
0.123
0.127
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
3.9
4.0
4.1
0.153
0.157
0.161
P
3.9
4.0
4.1
0.153
0.157
0.161
17/20
Order codes
8
Order codes
Table 7.
Order codes
18/20
LD2982Axx - LD2982Bxx
A Version
B Version
Output voltage
LD2982AM18R
LD2982BM18R
1.8 V
LD2982AM27R
LD2982BM27R
2.7 V
LD2982AM32R
LD2982BM32R
3.2 V
LD2982Axx - LD2982Bxx
Revision history
9
Revision history
Table 8.
Document revision history
Date
Revision
Changes
25-Jul-2006
4
Order codes updated.
14-Feb-2008
5
Added: Table 1 on page 1.
10-Jul-2008
6
Modified: Table 1 on page 1 and Table 7 on page 18.
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LD2982Axx - LD2982Bxx
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