ETC LM2931M-50 100ma low dropout voltage regulator Datasheet

Bay Linear
Linear Excellence
LM2931
100mA Low Dropout Voltage Regulator
Description
Features
The Bay Linear LM2931 are low power voltage regulators
designed for a wide range of applications. They are an
excellent choice for use in Battery Powered applications. The
LM2931 feature low quiescent current (100 µA Typ.) and low
dropout of only 60mV at light loads and 300mV (typ.) at
100mA. The LM2931 has tight initial tolerance of 0.5% typ.,
extremely good load and line regulation of 0.05% typ. and very
low output temperature coefficient.
The Bay Linear LM2931 is available as a fixed voltage
regulator and as an adjustable regulator in TO-92 and 8SOIC
packages. The Bay Linear LM2931 in an 8SOIC package has
an adjustable output voltage from 3V to 24V, programmed
with a pair of external resistor. The logic compatible shutdown
enables the regulator to be switched ON and OFF.
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Applications
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Pin Connection
Guaranteed 100mA Output
Fixed Versions 3.3V, 50.V, 8.0
Very Low Quiescent Current
Low Dropout Voltage
Extremely Tight Load and Line
Regulation
Very Low Temperature Coefficient
Current and Thermal Limiting
Reverse Battery Protection of –20V
Transient protection of 60V
Output programmable from 3V to 24V
Battery Powered Systems
Portable instrumentation
Notebooks Computers
Potable Consumer Equipment
Automotive electronics
SMPS Post-Regulator
Ordering Information
TO-92
Package
SOT-89
1
2
3
SOT-89
TO-92
8-SOIC
BAY
LM2931
OUTPUT
INPUT
GND OUTPUT
INPUT
GROUND
Front View
“XX” Voltage Selection Guide
Bottom View
8SOIC (M)
Output
1
8
Input
GND
2
7
GND
GND
3
6
GND
Feedback
4
5
Bay Linear, Inc
Tolerance
LM2931R-XX
LM2931Z-XX
LM2931M-XX
Shutdown
Vout
3.3V
5.0V
8.0V
8.5V
9.0V
10.0V
12.0V
15.0V
Adjustable
XX Code
33
50
80
85
90
10
12
15
Left Blank
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
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LM2931
Absolute Maximum Rating
Parameter
Power Dissipation
Lead Temperature ( Soldering 5 seconds )
Storage Temperature Range
Operating Junction Temperature
Input Supply Voltage
Internally Limited
260 °C
-65 °C to +150 °C
-55 °C to +150 °C
-20 to +35V
Electrical Characteristics
TJ = 25°C , IO = 100µA, VIN = 14V ( for 2931-15 VIN = 16V), CO = 100µF; unless otherwise specified)
Parameter
Conditions
MIN
TYP
MAX
Output Voltage
(Fixed Version)
-25 °C ≤ Tj ≤ 85 °C
Full Operating Temperature
0.985 [ Vo ]
Output Voltage (Fixed Version)
100µA ≤ IL ≤ 100mA, Tj ≤ T jmax
0.975 [Vo ]
Input Supply Voltage
Output Voltage Temperature
Coefficient
Line Regulation (Note 2)
Load Regulation (Note 2)
Dropout Voltage (Note 4)
Ground Current (Note 5)
Dropout Ground Current
Current Limit
Thermal Regulation (Note 6)
Output Noise,
10Hz to 100KHz
IL = 10mA
Ripple Rejection Ratio
1.015 [ Vo ]
Vo
1.025 [ Vo ]
26
150
0.98 [ Vo ]
(Note 1)
V
1.02 [ Vo ]
50
13V ≤ VIN ≤ 26V (Note 3)
100µA ≤ IL ≤ 100mA
IL = 100µA
IL = 100mA
IL = 100µA
IL = 10mA
IL = 100mA
VIN = (VOUT – 0.5V), IL = 100µA
VOUT = 0
CL = 2.2µF
CL = 3.3µF
CL = 33µF
IO = 10mA, f = 120Hz, C0 = 100µF
VIN = VO + 3V+2Vpp
Vo
UNIT
0.1
0.1
60
300
100
0.9
8
110
160
0.05
500
350
120
0.4
0.3
200
600
150
1.5
12
170
200
0.2
60
V
V
ppm / ° C
%
%
mV
µA
mA
mA
µA
mA
%/W
µVrms
dB
8 pin Versions only (LP2951)
Reference Voltage
Over Temperature (Note 7)
Feedback Pin Bias Current
Reference Voltage Temperature
Coefficient
Feedback Pin Bias Current
Temperature Coefficient
Shutdown Input
Input Logic Voltage
Shutdown Pin Input Current
Regulator Output Current
in Shutdown
Bay Linear, Inc
1.21
1.185
1.235
20
50
(Note 1)
1.26
1.285
40
ηA
ppm/°C
ηA/°C
0.1
Low (Regulator ON)
High (Regulator OFF)
VS = 2.4V
VS = 26V
(Note 8)
5.0V ≤ VOUT ≤ 15.0V
3.3V ≤ VOUT ≤ 5.0V
2.0V ≤ VOUT ≤ 3.3V
V
1.3
0.7
V
30
450
50
600
µA
2
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
10
20
30
µA
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LM2931
Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
Note 2: Unless otherwise specified all limits guaranteed for TJ = 25°C, VIN = VO +1V, IL = 100µA and CL = 1µF. Additional conditions for the 8pin versions are feedback tied to –XX Voltage tap and output tied to output Sense pin ( VOUT = XX V) and VSHUTDOWN ≤ 0.8V
Note 2: Regulation is measured at constant junction temperature , using pulse testing with a low duty cycle. Changes in output voltage due to
heating effects are covered under specification for thermal regulation.
Note 3: Line regulation for is tested at 150°C for IL = 1mA. For IL = 100µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. for
B2931-15 16V ≤ VIN ≤ 26V.
Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at
1V differential.
Note 5: Ground pin Current is the regulator quiescent current. The total current drawn from the source is the sum of the ground pin current and
output load current.
Note 6: Thermal regulation is the change in output voltage at a time T after a change in power dissipation, excluding load or line regulation
effects. Specifications are for a 50 mA load pulse (1.25W) for T = 10ms.
Note 7: VREF ≤ VOUT ≤ (VIN –1V), 2.3V ≤ VIN ≤ 26V, 100µA ≤ IL ≤100mA, TJ ≤ TJMAX
Note 8: VSHUTDOWN ≥ 2V, VIN ≤ 26V, VOUT = 0
Application Hints
The LM2931 requires an output capacitor for device
stability.
The value required varies greatly
depending upon the application circuit and other
factors.
The high frequency characteristics of
electrolytic capacitors depend greatly on the type and
also on the manufacturer. Sometimes only bench
testing is the only means to determine the proper
capacitor type and value. The high quality 100 µF
aluminum electrolytic covers all general application
circuits, this stability can be obtained with a tantalum
electrolytic value of 47 µF.
Another critical point of electrolytic characteristics is
its performance over temperature. The LM2931 is
designed to operate starting at -40°C which may not
be true in the case of electrolytic.
Higher
temperatures generally no problem. The electrolytic.
type in aluminum will freeze around -30°C. This
could cause an oscillation at output of regulator. At a
lower temperature requirement by many applications
the capacitor should maintain its performance. So as
a result, for an application which regulator junction
temperature does not exceed 25°C, the output
capacitor can be reduced by the
Bay Linear, Inc
factor of two over the value needed for the entire
temperature range.
Other points with linear regulators are that the twitch
higher output current stability decreases. In most
applications the LM2931 is operating at few
milliamps. In these applications the output capacitance
can be further reduced. For example, when the
regulator is running at 10mA output current the output
capacitance value is half compared to the same
regulator that is running at 100 mA.
With the LM2931 adjustable regulator, the minimum
value of output capacitance is a function of the output
voltage. The value decreases with higher output
voltages, since the internal loop gain is reduced.
The worst case occurs at the lower temperature and
maximum operating currents, the entire circuit and the
electrolytic, should be cooled down to the minimum
temperature. The minimum of 0.6 volts required at
the input of regulator above the output to keep the
power dissipation and die heating to its minimum.
After the value for the capacitor has been determined
for actual use, the value should be doubled.
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
LM2931
TYPICAL CHARACTERISTICS
15
10
~
~
~
~
IO = 50mA
2
1
IO = 0mA
40
0
80
20
15
10
1.10
90
0
0.3
IO = 50mA
IO = 10mA
0.1
80
800
0.5
500
0.4
0.3
0.2
120
50
3.0
2.0
14
12
10 ºC/W HEAT SINK
10
8
6
0.5
0.4
0.3
10 20 30 40 50 60 70 80 90
OPERATION DURING LOAD DUMP
OUTPUT
VOLTAGE (V)
1
0.1
0.2
0.1
0
0.01
Bay Linear, Inc
0.4" LENGTH
FROMPC BOARD
0
OUTPUT
VOLTAGE (V)
0.6
AMBIENT TEMPERATURE (ºC)
0.4
0.3
MAXIMUM POWER DISSIPATION
Ω)
OUTPUT IMPEDANCE (Ω)
POWER DISSIPATION (W)
0.7
25
0.125" LEAD LENGTH
FROM PC BOARD
0.5
AMBIENT TEMPERATURE (ºC)
LM29315.0
IO = 10mA
0.9
20
0.6
AMBIENT TEMPERATURE (ºC)
10
15
0.7
0
MAXIMUM POWER DISSIPATION (SO8)
10
0.8
0.1
INPUT VOLTAGE (V)
0.8
30
30
0.2
NO HEAT SINK
0 10 20 30 40 50 60 70 80 90 100
1.0
20
0.9
0
5
10
MAXIMUM POWER DISSIPATION (TO-92)
2
0
TJ = -40ºC
1.0
16
6.0
24
INPUT VOLTAGE (V)
18
4
1.0
21
200
0
POWER DISSIPATION (W)
POWER DISSIPATION (W)
4.0
18
TJ = 85ºC
300
100
INFINITE HEAT SINK
20
5.0
400
MAXIMUM POWER DISSIPATION (TO-220)
22
LM2931 5.0
IO = 100 mA
15
TJ = 25ºC
OUTPUT CURRENT (mA)
LOW VOLTAGE BEHAVIOR
5.0
12
0
0
6.0
9
100
0.1
JUNCTION TEMPERATURE (ºC)
4.0
6
PEAK OUTPUT CURRENT
0.6
0
3.0
3
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (mA)
INPUT OUTPUT DIFFERENTIAL (V)
INPUT OUTPUT DIFFERENTIAL (V)
60
DROPOUT VOLTAGE
0
OUTPUT VOLTAGE (V)
30
OUTPUT CURRENT (mA)
IO = 100mA
2.0
1.18
1.16
0
0
0.5
40
1.22
1.20
1.14
DROPOUT VOLTAGE
0
1.26
1.24
5
120
0.6
0.2
1.28
25
JUNCTION TEMPERATURE (ºC)
0.4
LM2931CT ADJUSTABLE
1.12
0
-40
1.30
VIN = 14V
REFERENCE VOLTAGE (V)
20
QUIESCENT CURRENT (mA)
QUIESCENT CURRENT (mA)
30
3
REFERENCE VOLTAGE
QUIESCENT CURRENT
QUIESCENT CURRENT
25
0
30
60
90
120
150
70
60
50
40
30
20
10
0 ~
~
6
4
2
0
-2
-100
FREQUENCY (Hz)
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
~
~
CO = 100µF
RL = 500W
0
100
200
300
400
500
TIME (ms)
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LM2931
TYPICAL APPLICATIONS
LM2931 ADJUSTABLE OUTPUT
LM2931 Fixed Output
LM2931
LM2931
ADJ.
SCHEMATIC DIAGRAM
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
LM2931
PACKAGE DRAWING
TO-92(Z)
0.090 (2.286) Radius typ.
2
1
3
0.145 (3.683)
0.135 (3.429)
0.055 (1.397)
0.045 (1.143)
10° typ.
BOTTOM VIEW
0.185 (4.699)
0.045 (1.143)
0.085 (2.159) Diameter
5° typ.
0.185 (4.699)
0.175 (4.445)
0.090 (2.286) typ.
5° typ.
Seating Plane
0.025 (0.635) Max
Uncontrolled
Lead Diameter
0.500 (12.70) Min.
0.016 (0.406)
0.014 (0.356)
0.0155 (0.3937)
0.0145 (0.3683)
0.055 (1.397)
0.045 (1.143)
0.105 (2.667)
0.095 (2.413)
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
LM2931
PACKAGE DRAWING
SO-8(M)
4.0 (0.158)
3.8 (0.150)
5.2 (0.205)
4.6 (0.181)
6.2 (0.244)
5.8 (0.228)
Pin 1
1.27 (0.50)
BSC
1.75 (0.069)
1.35 (0.053)
0.78 (0.031)
0.61 (0.024)
5.0 (0.197)
4.8 (0.188)
45°
0.37 (0.015)
BSC
0.77 (0.030)
0.64 (0.025)
7 °(4 PLCS)
3 ° -6°
0.56 (0.022)
0.49 (0.019)
0.45 (0.018)
0.35 (0.014)
Bay Linear, Inc
0.20 (0.008)
0.10 (0.004)
0.22 (0.009)
0.19 (0.007)
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
7 ° (4 PLCS)
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LM2931
PACKAGE DRAWING
SOT-89®
C
A
J
N
P
2
1
3
K
B
F
D
G
-T-
STYLE 1
PIN 1. BASE
2. COLLECTOR
3. EMITTER
STYLE 3
PIN 1. GATE
2. ANODE
3. CATHODE
STYLE 2
PIN 1. ANODE
2. CATHODE
3. NO CONNECTION
STYLE 4
PIN 1. DRAIN
2. GATE
3. SOURCE
DIM
A
B
C
D
E
F
G
J
K
L
N
P
MILLIMETERS
MIN
MAX
4.40
4.60
2.29
2.60
140
160
0.36
0.48
1.62
1.80
0.44
0.53
150 BSC
0.35
0.44
0.80
1.04
300 BSC
2.04
2.28
3.94
4.25
INCHES
MIN
MAX
0.174
0.181
0.091
0.102
0.056
0.062
0.015
0.018
0.064
0.070
0.018
0.020
0.059 BSC
0.014
0.017
0.032
0.040
0.118 BSC
0.081
0.089
0.156
0.167
Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations,
computer simulations and/ or initial prototype evaluation.
Preliminary Information- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are
subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.
The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit
design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any
industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different
applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application.
LIFE SUPPORT AND NUCLEAR POLICY
Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical
implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without
the specific written consent of Bay Linear President.
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
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