100mA LOW DROPOUT VOLTAGE REGULATORS
FEATURES
●
High accuracy output voltage
●
Guaranteed 100 mA output
●
Very low quiescent current
●
Extremely tight load and line regulation
●
Very low temperature coefficient
●
Current and thermal limiting
●
Low dropout voltage
●
Need only 1uF for stability
●
Error flag warns of output dropout
●
Logi-control electronic shutdown
●
Output programmable from 1.24 to 29V
●
Moisture Sensitivity Level 3
Pin 1 : Output
Pin 2 : Ground
Pin 3 : Input
1
2
3
LM2950/1
TO- 92 PKG
SOP- 8 PKG
Pin : 1. Output
2. Sense
3. Shutdown
4. Ground
5. Error
6. Tap
7. Feedback
8. Input
Applications
●
High-efficiency linear regulator, voltage reference
●
Battery powered systems
●
Portable consumer equipment
●
Portable / Parm, Desktop / Notebook computers
●
Portable Instrumentation, cordless telephones
●
Automotive Electronics, Radio control systems
●
SMPS Post-Regulator, Avionics
ORDERING INFORMATION
DEVICE
PKG
LM2950-XX
LM2950TA-XX
LM2951D-XX
Adjustable)
TO-92 (Bulk)
TO-92 (Tape)
SOP-8
(XX= 1.5, 1.8, 2.8, 2.85, 3.0, 3.3, 5.0V,
DESCRIPTION
The LM2950/1 is a low power voltage regulator. This device excellent choice for use in battery powered
application such as cordless telephone, radio control systems, and portable computers.
The LM2950/1 features very low quiescent current (75㎂ Typ.) and very low drop output voltage
(Typ. 400㎷ at light load and 380㎷ at 100㎃).
This includes a tight initial tolerance of 0.5% Typ., extremely good load and line regulation of 0.05% Typ.,
and very low output temperature coefficient, making the LM2950/1 useful as a low-power voltage reference.
The error flag output feature is used as power-on reset for warn of a low output voltage, due to
following batteries on input. Other feature is the logic-compatible shutdown input which enable the
regulator to be switched on and off. The LM2950/1 is available in 8-pin plastic packages.
The regulator output voltage may be pin-strapped for a -XX volt or programmed from 1.24 volt to 29 volts
with external pair of resistors. The LM2950/1 is offered in 3-pin to-92 package compatible with other
fixed regulator.
Dec. 2015 - Rev. 1.3
HTC
−
1
−
100mA LOW DROPOUT VOLTAGE REGULATORS
BLOCK DIAGRAM AND TYPICAL APPLICATIONS (LM2950)
UNREGULATED DC
LM2950/1
+
INPUT
V
OUT
OUTPUT
+
-
100㎃
MAX
+
-
ERROR
AMPLIFIER
+
1㎌
+
1.23V
REFERENCE
60KΩ
GROUND
BLOCK DIAGRAM AND TYPICAL APPLICATIONS (LM2951)
ABSOLUTE MAXIMUM RATINGS
POWER DISSIPATION
Lead Temperature (Soldering, 5 seconds)
Storage Temperature Range
Operating Junction Temperature Range
Input Supply Voltage
Feedback Input Voltage
Shutdown Input Voltage
Error Comparator Output
Dec. 2015 - Rev. 1.3
INTERNALLY LIMITED
260℃
-65℃ to +150℃
-55℃ to +150℃
-0.3 to +30V
-1.5 to +30V
-0.3 to +30V
-0.3 to +30V
HTC
−
2
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100mA LOW DROPOUT VOLTAGE REGULATORS
ELECTRICAL CHARACTERISTICS
(at T
a
=25℃, V
IN
=15V, unles otherwise specified)
PARAMETER
Output Voltage
Output Voltage
Output Voltage Temperature Coefficient
Line Regulation (Note 3)
Load Regulation (Note 3)
Dropout Voltage (Note 4)
CONDITIONS (Note 2)
-25℃
≤T
J
≤85℃
Full Operating Temperature
100㎂≤I
L
≤100㎃,T
J
≤T
JMAX
(Note 1)
V
0
+1V≤V
IN
≤30V
100㎂≤I
L
≤100㎃
I
L
=100㎂
I
L
=100㎃
MIN
0.985½V
0
½
0.980½V
0
½
0.976½V
0
½
TYP
V
0
V
0
50
0.04
0.1
50
380
0
#
MAX
LM2950/1
UNITS
1.015½V
0
½
1.020½V
0
½
1.024½V
0
½
150
0.4
ppm/℃
%
%
㎷
450
V
ELECTRICAL CHARACTERISTICS
(at T
a
=25℃, V
IN
=15V, unles otherwise specified)
PARAMETER
Ground Current
Dropout Ground Current
Current Limit
Thermal Regulation
C
L
=1㎌
Output Noise, 10Hz to 100kHz
C
L
=200㎌
C
L
=3.3㎌
(Bypass=0.01㎌ pins 7 to 1
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
Shutdown Input
Low (Regulator ON)
Input Logic Voltage
High (Regulator OFF)
V
S
=2.4V
Shutdown Pin Input Current
V
S
=30V
(Note 7)
㎂
V
OUT
=5.0V
Regulator Output Current Shutdown
3.3V≤V
OUT
＜5.0V
2.0V≤V
OUT
＜3.3V
20
30
3
#
#
600
2
30
50
1.3
0.7
V
V
OH
=30V
V
IN
=4.5V, I
OL
=400㎂
(Note 6)
(Note 6)
(Note 6)
40
#
#
㎷
75
15
15
0.01
1.0
250
㎂
CONDITIONS (Note 2)
I
L
=100㎂
I
L
=100㎃
V
IN
=V
0
-0.5V, I
L
=100㎂
V
OUT
=0
8
110
160
0.05
430
160
100
μVr㎳
MIN
TYP
75
MAX
120
12
170
250
0.2
UNITS
㎂
㎃
㎂
㎃
%/W
Dec. 2015 - Rev. 1.3
HTC
−
3
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100mA LOW DROPOUT VOLTAGE REGULATORS
LM2950/1
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 T
J
= 25℃, V
IN
= V
0
+1V, I
L
= 100㎂ and C
L
= 1㎌. Additional condition for the 8-pin
OUT
=XX
versions are feedback tied to -XX V tap and output tied to output Sense (V
V) and V
SHOUTDOWN
≤0.8V
Note 3 : Regulations 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 the specification for thermal regulation.
Note 4 : Dropout voltage is defined as the input to output differential at which the output voltage drops 100
㎷
below its nominal value measured
at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage(2.3V over temperature)
must be taken into account.
Note 5 : V
REF
≤V
OUT
≤(V
IN
-1V), 2.3V≤V
IN
≤30V,
100㎂≤I
L
≤100㎃,
T
J
≤T
JMAX
Note 6 : Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage
measured at V
OUT
+1V input. To express these thresholds in terms of output voltage changed,
multiply by the error amplifier gain = V
OUT
/V
REF
=
(R1+R2)/R2. For example, at a programmed output voltage of 5V, the error output is
guaranteed to go low when the output drops by 95
㎷
x 5V / 1.235V = 384
㎷.
Thresholds remain constant as a percent V
OUT
as V
OUT
is
varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Note 7 : V
SHUTDOWN
≥2V,
V
IN
≤30V,
V
OUT
=0, Feed-back pin tied to -XX V Tap.
Dec. 2015 - Rev. 1.3
HTC
−
4
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