ETC LM2950 0.1a low dropout voltage regulator Datasheet

0.1A LOW DROPOUT VOLTAGE REGULATORS
LM2950
Features
-
TO-92
High accuracy output voltage
Guaranteed 0.1A output
Very low quiescent current
Low dropout voltage
Extermely tight load and line regulation
Very low temperature coefficent
Need only 1uF for stability
Error flag warns of output dropout
Logi-control electronic shutdown
Output programmable from 1.24 to 29V
Applications
1. Vout 2. Gnd 3. Vin
- Battery powered systems
- Cordless telephones
- Radio control systems
- Portable/Palm top/Notebook
computer
- Portable consumer equipment
- Portable Instrumentation
- Avionics
- Automotive Electronics
- SMPS Post-Regulator
- Voltage Reference
1
ORDERING INFORMATION
DEVICE
PKG
LM2950L-XX
TO-92
(XX= Output Voltage=2.85, 3.0, 3.3, 5.0V
Adjustable=AD )
PRODUCT DESCRIPTION
The LM2950 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 features very low quiescent current (75㎂ Typ.) and very low drop output voltage
(Typ. 40㎷ 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 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 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 is offered in 3-pin to-92 package compatible with other
fixed regulator.
BLOCK DIAGRAM AND TYPICAL APPLICATIONS
UNREGULATED DC
INPUT
VOUT
OUTPUT
+
-
-
+1.23V
ERROR
AMPLIFIER
REFERENCE
100㎃
MAX
+
1㎌
60KΩ
GROUND
HTC
1
0.1A LOW DROPOUT VOLTAGE REGULATORS
LM2950
ABSOLUTE MAXIMUM RATINGS
INTERNALLY LIMITED
POWER DISSIPATION
260℃
Lead Temperature (Soldering, 5 seconds)
Storage Temperature Range
-65℃ to +150℃
Operating Junction Temperature Range
-55℃ to +150℃
Input Supply Voltage
-0.3 to +30V
Feedback Input Voltage
-1.5 to +30V
Shutdown Input Voltage
-0.3 to +30V
Error Comparator Output
-0.3 to +30V
ELECTRICAL CHARACTERISTICS(at Ta=25℃, VIN=15V, unles otherwise specified)
PARAMETER
Output Voltage
Output Voltage
CONDITIONS (Note 2)
MIN
-25℃ ≤TJ ≤85℃
0.985|V0|
Full Operating Temperature
100㎂≤IL ≤100㎃,TJ≤TJMAX
0.980|V0|
0.976|V0|
TYP
V0
V0
MAX
UNITS
1.015|V0|
1.020|V0|
V
1.024|V0|
(Note 1)
V0+1V≤VIN≤30V
50
150
ppm/℃
Line Regulation (Note 3)
0.04
0.4
%
Load Regulation (Note 3)
100㎂≤IL ≤100㎃
0.1
0.3
%
IL =100㎂
50
80
IL =100㎃
380
450
IL =100㎂
75
120
㎂
IL =100㎃
8
12
㎃
㎂
Output Voltage Temperature Coefficient
Dropout Voltage (Note 4)
Ground Current
㎷
Dropout Ground Current
VIN=V0-0.5V, IL =100㎂
110
170
Current Limit
VOUT=0
160
200
㎃
0.05
0.2
%/W
Thermal Regulation
CL =1㎌
Output Noise, 10Hz to 100kHz
430
CL =200㎌
160
CL =3.3㎌
100
μVr㎳
(Bypass=0.01㎌ pins 7 to 1
Error Comparator
Output Leakage Current
VOH=30V
0.01
1.0
Output Low Voltage
VIN=4.5V, IOL=400㎂
150
250
Upper Threshold Voltage
(Note 6)
Lower Threshold Voltage
(Note 6)
75
Hysteresis
(Note 6)
15
40
60
95
㎂
㎷
Shutdown Input
Input Logic Voltage
Shutdown Pin Input Current
Regulator Output Current Shutdown
1.3
Low (Regulator ON)
High (Regulator OFF)
VS=2.4V
VS=30V
(Note 7)
VOUT=5.0V
0.7
2
30
50
450
600
3
10
3.3V≤VOUT<5.0V
20
2.0V≤VOUT<3.3V
30
V
㎂
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℃, VIN=V0+1V, IL =100㎂ and C L =1㎌. Additional condition
for the 8-pin versions are feedback tied to -XX V tap and output tied to output Sense (V OUT=XX V) and
VSHOUTDOWN≤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.
HTC
2
0.1A LOW DROPOUT VOLTAGE REGULATORS
LM2950
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≤VOUT≤(VIN-1V), 2.3V≤V IN≤30V, 100㎂≤I L≤100㎃, T J≤TJMAX
Note 6 : Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the
nominal reference voltage measured at V 0+1V input. To express these thresholds in terms of output voltage changed,
multiply by the error amplifier gain=V OUT/VREF=(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㎷x5V/1.235V=384㎷. Thresholds remain constant
as a percent V OUT as VOUT 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.
HTC
3
Similar pages