STMicroelectronics LD2982AM33R Very low drop and low noise voltage regulator with inhibit function, low esr cap. compatible Datasheet

LD2982
SERIES
VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR
WITH INHIBIT FUNCTION, LOW ESR CAP. COMPATIBLE
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VERY LOW DROPOUT VOLTAGE (120mV
AT 50mA AND 7mV AT 1mA LOAD)
VERY LOW QUIESCENT CURRENT (375µA
TYP. AT 50mA LOAD AND 75µA AT 1mA)
OUTPUT CURRENT UP TO 50mA
LOGIC CONTROLLED ELECTRONIC
SHUTDOWN
OUTPUT VOLTAGE OF 1.5,1.8, 2.5, 2.8, 2.85,
3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V
INTERNAL CURRENT AND THERMAL LIMIT
AVAILABLE IN ± 1% TOLLERANCE (AT 25°C,
A VERSION)
SUPPLY VOLTAGE REJECTION: 45dB (TYP)
ONLY 1µF FOR STABILITY
LOW OUTPUT NOISE VOLTAGE 30µVrms
SMALLEST PACKAGE SOT23-5L
TEMPERATURE RANGE: -40°C TO 125°C
DESCRIPTION
The LD2982 is a 50mA 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 1µA when INHIBIT
SOT23-5L
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.
An external capacitor CBYP=10nF connected
between bypass pin and GND reduce the noise
to 30µVrms.
Typical application are in cellular phone, palmtop/
laptop computer, personal digital assistant (PDA),
personal stereo, camcorder and camera.
SCHEMATIC DIAGRAM
July 2003
1/13
LD2982 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol
VI
VINH
Parameter
Value
Unit
DC Input Voltage
16
V
INHIBIT Input Voltage
16
V
Output Current
Internally limited
Ptot
Power Dissipation
Internally limited
Tstg
Storage Temperature Range
-65 to +150
°C
Top
Operating Junction Temperature Range
-40 to +125
°C
IO
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
Rthj-case
Parameter
Thermal Resistance Junction-case
CONNECTION DIAGRAM (top view)
SOT23-5L
Unit
81
°C/W
PIN DESCRIPTION
Pin N° Symbol
1
2
3
4
SOT23-5L
5
Name and Function
IN
Input Port
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
Bypass Bypass Pin: Capacitor to be
connected to GND in order to
improve the thermal noise
performances.
OUT Output Port
ORDERING CODES
2/13
A VERSION
B VERSION
OUTPUT VOLTAGES
LD2982AM15R
LD2982AM18R
LD2982AM25R
LD2982AM28R
LD2982AM285R
LD2982AM30R
LD2982AM31R
LD2982AM32R
LD2982AM33R
LD2982AM35R
LD2982AM36R
LD2982AM38R
LD2982AM40R
LD2982AM47R
LD2982AM50R
LD2982BM15R
LD2982BM18R
LD2982BM25R
LD2982BM28R
LD2982BM285R
LD2982BM30R
LD2982BM31R
LD2982BM32R
LD2982BM33R
LD2982BM35R
LD2982BM36R
LD2982BM38R
LD2982BM40R
LD2982BM47R
LD2982BM50R
1.5V
1.8V
2.5V
2.8V
2.85V
3.0V
3.1V
3.2V
3.3V
3.5V
3.6V
3.8V
4.0V
4.7V
5.0V
LD2982 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2982A (TJ = 25°C, VI=VO+1V, IO=1mA, VSHDN=2V,
CI = 1µF, CO = 1µF, unless otherwise specified)
Symbol
Parameter
VOp
Operating Input Voltage
VO
Output Voltage
Test Conditions
IO = 1 to 50mA
Output Voltage
1.485
TJ= -40 to 125°C
VI = 2.8V
IO = 1 to 50mA
Output Voltage
TJ= -40 to 125°C
VI = 3.5V
IO = 1 to 50mA
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
V
2.462
2.537
V
2.45
2.55
V
VI = 3.85V
2.821
IO = 1 to 50mA
2.807
TJ= -40 to 125°C
2.8
2.85
2.793
V
V
2.907
V
3.030
V
2.970
IO = 1 to 50mA
2.955
3.045
V
2.94
3.06
V
3.131
V
TJ= -40 to 125°C
VI = 4.1V
3.069
TJ= -40 to 125°C
3.0
2.879
2.893
VI = 4.0V
3.1
3.053
3.146
V
3.038
3.162
V
VI = 4.2V
3.168
3.232
V
IO = 1 to 50mA
3.152
3.248
V
3.136
3.264
V
TJ= -40 to 125°C
VI = 4.3V
3.267
IO = 1 to 50mA
3.250
TJ= -40 to 125°C
3.465
IO = 1 to 50mA
3.447
TJ= -40 to 125°C
VI = 4.6V
TJ= -40 to 125°C
3.5
3.6
3.333
V
3.349
V
3.366
V
3.535
V
3.552
V
3.57
V
3.636
V
3.546
3.654
V
3.528
3.672
V
3.838
V
3.762
TJ= -40 to 125°C
3.3
3.43
3.564
VI = 4.8V
3.2
3.234
VI = 4.5V
IO = 1 to 50mA
Output Voltage
2.525
2.5
V
IO = 1 to 50mA
VO
V
V
2.856
IO = 1 to 50mA
Output Voltage
1.827
1.836
2.744
TJ= -40 to 125°C
IO = 1 to 50mA
VO
1.773
1.764
V
IO = 1 to 50mA
VO
V
V
IO = 1 to 50mA
VO
1.818
1.8
2.828
IO = 1 to 50mA
VO
V
V
2.842
IO = 1 to 50mA
Output Voltage
1.523
1.530
2.772
IO = 1 to 50mA
VO
V
2.758
IO = 1 to 50mA
VO
V
1.515
VI = 3.8V
IO = 1 to 50mA
VO
16
1.5
IO = 1 to 50mA
IO = 1 to 50mA
VO
TJ= -40 to 125°C
Unit
1.477
2.475
IO = 1 to 50mA
VO
Max.
1.470
1.782
IO = 1 to 50mA
VO
Typ.
2.5
VI = 2.5V
IO = 1 to 50mA
VO
Min.
3.8
3.743
3.857
V
3.724
3.876
V
VI = 5.0V
3.96
4.04
V
IO = 1 to 50mA
3.94
4.06
V
3.92
4.08
V
IO = 1 to 50mA
TJ= -40 to 125°C
4
3/13
LD2982 SERIES
Symbol
VO
Parameter
Output Voltage
Test Conditions
Min.
Typ.
Max.
VI = 5.7V
4.653
4.7
4.747
V
IO = 1 to 50mA
4.629
4.77
V
4.794
V
5.05
V
IO = 1 to 50mA
VO
Output Voltage
Short Circuit Current
∆VO/∆VI Line Regulation
4.606
VI = 6.0V
4.95
IO = 1 to 50mA
4.925
5.075
V
4.9
5.1
V
IO = 1 to 50mA
ISC
TJ= -40 to 125°C
TJ= -40 to 125°C
RL = 0
5
150
VI = VO+1V to 16V, IO = 1mA
0.003
VI = VO+1V to 16V, IO = 1mA
TJ= -40 to 125°C
Vd
Dropout Voltage
IO = 0
IO = 0
1
TJ= -40 to 125°C
IO = 1mA
IO = 1mA
7
TJ= -40 to 125°C
IO = 10mA
IO = 10mA
40
TJ= -40 to 125°C
IO = 50mA
IO = 50mA
Id
Quiescent Current
120
TJ= -40 to 125°C
IO = 0
IO = 0
80
TJ= -40 to 125°C
IO = 1mA
IO = 1mA
100
TJ= -40 to 125°C
IO = 10mA
IO = 10mA
200
TJ= -40 to 125°C
IO = 50mA
IO = 50mA
600
TJ= -40 to 125°C
OFF MODE VINH<0.18V
Supply Voltage Rejection
CBYP = 0.01µF
CO = 10µF
mA
0.014
%/VI
0.032
%/VI
3
mV
5
mV
10
mV
15
mV
60
mV
90
mV
150
mV
225
mV
100
µA
150
µA
150
µA
200
µA
300
µA
400
µA
900
µA
1200
µA
1
µA
µA
0
OFF MODE VINH<0.18V
TJ= -40 to 125°C
SVR
Unit
f = 1KHz
45
dB
VIL
Control Input Logic Low
TJ= -40 to 125°C
VIH
Control Input Logic High
TJ= -40 to 125°C
IiNH
Control Input Current
TJ= -40 to 125°C
VSHDN = 5V
5
15
µA
TJ= -40 to 125°C
VSHDN = 0V
0
-1
µA
eN
4/13
Output Noise Voltage
0.15
2
B= 300Hz to 50KHz
CO = 10µF
CBYP = 0.01µF
V
V
30
µV
LD2982 SERIES
ELECTRICAL CHARACTERISTICS FOR LD2982B (TJ = 25°C, VI=VO+1V, IO=1mA, VSHDN=2V,
CI = 1µF, CO = 1µF, unless otherwise specified)
Symbol
Parameter
VOp
Operating Input Voltage
VO
Output Voltage
Test Conditions
IO = 1 to 50mA
Output Voltage
1.477
TJ= -40 to 125°C
VI = 2.8V
IO = 1 to 50mA
Output Voltage
TJ= -40 to 125°C
VI = 3.5V
IO = 1 to 50mA
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
Output Voltage
2.45
2.55
V
2.412
2.587
V
VI = 3.85V
2.807
2.793
TJ= -40 to 125°C
VI = 4.0V
TJ= -40 to 125°C
2.85
3.0
2.893
V
2.907
V
2.950
V
3.045
V
2.94
3.06
V
2.895
3.105
V
3.146
V
3.053
TJ= -40 to 125°C
2.8
2.750
2.955
VI = 4.1V
3.1
3.038
3.162
V
2.991
3.208
V
VI = 4.2V
3.152
3.248
V
IO = 1 to 50mA
3.136
3.264
V
3.088
3.312
V
TJ= -40 to 125°C
VI = 4.3V
3.250
IO = 1 to 50mA
3.234
TJ= -40 to 125°C
3.447
IO = 1 to 50mA
3.430
TJ= -40 to 125°C
VI = 4.6V
TJ= -40 to 125°C
3.5
3.6
3.349
V
3.366
V
3.415
V
3.552
V
3.370
V
3.662
V
3.654
V
3.528
3.672
V
3.474
3.726
V
3.857
V
3.743
TJ= -40 to 125°C
3.3
3.377
3.546
VI = 4.8V
3.2
3.184
VI = 4.5V
IO = 1 to 50mA
Output Voltage
V
IO = 1 to 50mA
IO = 1 to 50mA
VO
2.537
2.5
V
IO = 1 to 50mA
Output Voltage
V
V
2.898
TJ= -40 to 125°C
IO = 1 to 50mA
VO
1.836
1.863
2.702
IO = 1 to 50mA
VO
1.764
1.737
V
IO = 1 to 50mA
VO
V
V
IO = 1 to 50mA
VO
1.827
1.8
2.842
IO = 1 to 50mA
Output Voltage
V
V
2.856
IO = 1 to 50mA
VO
1.530
1.553
2.758
IO = 1 to 50mA
Output Voltage
V
2.744
IO = 1 to 50mA
VO
V
1.523
VI = 3.8V
IO = 1 to 50mA
VO
16
1.5
IO = 1 to 50mA
IO = 1 to 50mA
VO
TJ= -40 to 125°C
Unit
1.470
2.462
IO = 1 to 50mA
VO
Max.
1.447
1.773
IO = 1 to 50mA
VO
Typ.
2.5
VI = 2.5V
IO = 1 to 50mA
VO
Min.
3.8
3.724
3.876
V
3.667
3.933
V
VI = 5.0V
3.94
4.06
V
IO = 1 to 50mA
3.92
4.08
V
3.86
4.14
V
IO = 1 to 50mA
TJ= -40 to 125°C
4
5/13
LD2982 SERIES
Symbol
VO
Parameter
Output Voltage
Test Conditions
Min.
Typ.
VI = 5.7V
4.629
4.7
IO = 1 to 50mA
4.606
IO = 1 to 50mA
VO
Output Voltage
TJ= -40 to 125°C
VI = 6.0V
4.925
IO = 1 to 50mA
IO = 1 to 50mA
ISC
Short Circuit Current
∆VO/∆VI Line Regulation
4.535
TJ= -40 to 125°C
5
Dropout Voltage
400
0.003
1
TJ= -40 to 125°C
7
TJ= -40 to 125°C
40
TJ= -40 to 125°C
IO = 50mA
Quiescent Current
120
TJ= -40 to 125°C
IO = 0
IO = 0
80
TJ= -40 to 125°C
IO = 1mA
IO = 1mA
100
TJ= -40 to 125°C
IO = 10mA
IO = 10mA
200
TJ= -40 to 125°C
IO = 50mA
IO = 50mA
600
TJ= -40 to 125°C
OFF MODE VINH<0.18V
Supply Voltage Rejection
CBYP = 0.01µF
CO = 10µF
mA
0.014
%/VI
0.032
%/VI
3
mV
5
mV
10
mV
15
mV
60
mV
90
mV
150
mV
225
mV
100
µA
150
µA
150
µA
200
µA
300
µA
400
µA
900
µA
1200
µA
1
µA
µA
0
OFF MODE VINH<0.18V
TJ= -40 to 125°C
SVR
V
V
IO = 10mA
Id
V
5.075
V
IO = 1mA
IO = 50mA
4.864
5.1
IO = 0
IO = 10mA
V
V
5.175
VI = VO+1V to 16V, IO = 1mA
IO = 1mA
4.77
4.794
4.9
RL = 0
IO = 0
Unit
4.825
VI = VO+1V to 16V, IO = 1mA
TJ= -40 to 125°C
Vd
Max.
f = 1KHz
45
dB
VIL
Control Input Logic Low
TJ= -40 to 125°C
VIH
Control Input Logic High
TJ= -40 to 125°C
IiNH
Control Input Current
TJ= -40 to 125°C
VSHDN = 5V
5
15
µA
TJ= -40 to 125°C
VSHDN = 0V
0
-1
µA
eN
6/13
Output Noise Voltage
0.15
2
B= 300Hz to 50KHz
CO = 10µF
CBYP = 0.01µF
V
V
30
µV
LD2982 SERIES
TYPICAL CHARACTERISTICS (unless otherwise specified TJ = 25°C, CI=1µF, CO=2.2µF, CBYP=100nF)
Figure 1 : Output Voltage vs Temperature
Figure 4 : Quiescent Current vs Load Current
Figure 2 : Dropout Voltage vs Temperature
Figure 5 : Quiescent Current vs Temperature
Figure 3 : Dropout Voltage vs Output Current
Figure 6 : Supply Voltage Rejection vs
Temperature
7/13
LD2982 SERIES
Figure 7 : Supply Voltage Rejection vs Output
Current
Figure 10 : Supply Voltage Rejection vs
Frequency
Figure 8 : Supply Voltage Rejection vs Output
Current
Figure 11 : Line Transient
VO=2.5V, IO= 50mA, no CI, CO=4.7µF, tr=tf=2ns
Figure 9 : Supply Voltage Rejection vs
Frequency
Figure 12 : Line Transient
VO=2.5V, IO= 50mA, no CI, CO=4.7µF, tr=tf=1µs
8/13
LD2982 SERIES
Figure 13 : Load Transient
Figure 14 : Load Transient
VO=2.5V, IO=0 to 50mA, no CI, CO=10µF, ts=tf=2ns
VO=2.5V, IO=0 to 50mA, no CI, CO=4.7µF, ts=tf=2ns
EXTERNAL CAPACITORS
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.
INPUT CAPACITOR
An input capacitor whose value is 1µF 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.
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 E.S.R. (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 E.S.R. ceramic type is used, is 1µF for
output voltages equal or major than 3.8V, 2.2µF for VO going from 1.8 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.
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 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.
9/13
LD2982 SERIES
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 160µA. R1 and R2
resistors are implanted type; typical values are, respectively, 42.6 KΩ and 51.150 KΩ.
Figure 15 : Reverse Current Test Circuit
10/13
LD2982 SERIES
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
.
7049676C
11/13
LD2982 SERIES
Tape & Reel SOT23-xL MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
A
MIN.
TYP.
180
13.0
13.2
MAX.
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
12/13
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
LD2982 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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© 2003 STMicroelectronics - Printed in Italy - All Rights Reserved
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13/13
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