LP2951-3.0 [FCI]
100mA Low Drop Out Voltage Regulators Portable consumer equipment; 百毫安低压差稳压器便携式消费类设备型号: | LP2951-3.0 |
厂家: | FIRST COMPONENTS INTERNATIONAL |
描述: | 100mA Low Drop Out Voltage Regulators Portable consumer equipment |
文件: | 总3页 (文件大小:122K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LP2950/LP2951 100mA Low Drop Out Voltage Regulators
FEATURES
APPLICATIONS
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High accuracy output voltage
Guaranteed 100mA output
Very low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Needs only 1mF for stability
Error Flag warns of output dropout
Logic-Controlled electronic shutdown
Output programmable from 1.24 to 29V
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Battery powered systems
Cordless telephones
Radio control systems
Portable/Palm top/Notebook computers
Portable consumer equipment
Portable Instrumentation
Avionics
Automotive Electronics
SMPS Post-Regulator
Voltage Reference
PRODUCT DESCRIPTION
The LP2950-XX/LP2951-XX is a low power voltage regulator. This device excellent choice for use in battery powered application such as c
ordless telephone, radio control systems, and portable computers.
The LP2950-XX/LP2951-XX features very low quiescent current (75mA Typ.) and very low drop output voltage (Typ.
40mV at light load and 380mV at 100mA). 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 LP2950-XX/LP2951-XX
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 i
s the logic-compatible shutdown input which enable the regulator to be switched on and off.
The LP2951-XX 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 LP2950-XX is offered in 3-pin TO-92 package compatible with other fixed regulator.
Absolute Maximum Ratings
Power Dissipation
Internally Limited
Pin Connection
LP2951-XX
Lead Temperature
(Soldering, 5 seconds)
260°C
Storage Temperature Range
Operating Junction Temperature Range
Input Supply Voltage
-65°C to+150°C
-55°C to +150°C
-0.3 to +30V
Feedback Input Voltage
-1.5 to +30V
Shutdown Input Voltage
-0.3 to +30V
Top View
TO-92 Plastic Package
(LP2950-XX only)
Error Comparator Output
-0.3 to +30V
Device Selection Guide
Vout, V
olts
Device
2.85*
3.0
3.3
LP2950-2.85, LP2951-2.85
LP2950-3.0, LP2951-3.0
LP2950-3.3, LP2951-3.3
LP2950-5.0, LP2951-5.0
Bottom View
5.0
* - other versions are also available
Vout = 2.0V to 5.0V. Please consult factory for
more information
Figure 1. Adjustable Regulator
LP2950/LP2951 100mA Low Drop Out Voltage Regulators
ELECTRICALCHARACTERISTICS(atT a=25 oC,V =15V;unlessotherwisenoted)
IN
Parameter
Conditions (Note 2)
Min
Typ
Max
Units
Output Voltage
0.985 |V0|
0.98 |V0|
V0
1.015 |V0|
1.02 |V0|
V
-25°C£TJ£85°C
Full Operating Temperature
100mA £ IL £ 100mA, TJ£TJMAX
(Note 1)
Output Voltage
0.976|V0|
V0
50
1.024 |V0|
150
Output Voltage Temperature Coefficient
Line Regulation (Note 3)
ppm/°C
%
0.04
0.1
0.4
V0 + 1V £ Vin £ 30V (Note 4)
100mA £ IL £ 100mA
Load Regulation (Note 3)
0.3
%
Dropout Voltage (Note 5)
50
380
75
8
80
450
120
12
mV
IL=100 mA
IL=100 mA
Ground Current
IL=100 mA
IL=100 mA
mA
mA
Dropout Ground Current
Current Limit
110
160
170
200
0.2
Vin=V0 - 0.5V, IL=100 mA
mA
mA
Vout=0
Thermal Regulation
0.05
%/W
Output Noise, 10Hz to 100KHz
430
160
100
CL=1mF
CL=200mF
CL=3.3mF
mV rms
(Bypass=0.01 mF pins 7 to 1
(LP2951-XX))
8-pin Versions only
Reference Voltage
1.21
1.235
1.26
1.285
40
V
Reference Voltage
Over Temperature (Note 6)
(Note 7)
1.185
Feedback Pin Bias Current
Reference Voltage Temperature Coefficient
Feedback Pin Bias Current Temperature Coefficient
Error Comparator
20
50
nA
ppm/°C
0.1
nA/°C
Output Leakage Current
Voh=30V
0.01
1.0
mA
Output Low Voltage
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
150
60
250
mV
Vin=4.5V, IOL=400 mA
(Note 8)
40
(Note 8)
75
95
(Note 8)
15
Shutdown Input
Input Logic Voltage
Low (Regulator ON)
High (Regulator OFF)
VS=2.4V
1.3
0.7
V
2
Shut down Pin Input Current
Regulator Output Current in Shutdown
30
50
VS=30V
450
600
(Note 9)
VOUT = 5.0 V
3
10
20
30
mA
3.3V £ VOUT < 5.0 V
2.0V £ VOUT < 3.3 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 TJ = 25°C, Vin = V0 + 1V, IL = 100mA and CL = 1mF. Additional conditions for the
8-pin versions are feedback tied to -XX V tap and output tied to output Sense (Vout = XX V) and Vshutdown £ 0.8 V
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: Line regulation for LP2951-XX is tested at 150°C for IL = 1mA. For IL = 100mA and TJ = 125°C, line regulation is guaranteed by design to
0.2%. See typical performance characteristics for line regulation versus temperature and load current.
Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below its nominal value measured
at 1V differential. At very low values of programmed output voltage, the minimum input supply voltage of 2V (2.3V over temperature) must be
taken into account.
Note 6: Vref £ Vout £ (Vin - 1V), 2.3V £ Vin £ 30V, 100mA £ IL £ 100mA, TJ £ TJMAX
Note 7: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range
Note 8: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage
measured at V0 + 1V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = Vout/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 95mV x 5V/
1.235V=384mV. Thresholds remain constant as a percent of Vout as Vout is varied , with the dropout warning occurring at typically 5% below
nominal, 7.5% guaranteed.
Note 9: Vshutdown ³ 2V, Vin £ 30V, Vout = 0, Feed-back pin tied to -XX V Tap.
LP2950/LP2951 100mA Low Drop Out Voltage Regulators
Block Diagram and Typical Applications
LP2950-XX
LP2951-XX
PAD LOCATION LP2951-XX
(For LP2950-XX fixed versions see Note 1)
Chip Size: 2.05 x 1.15 mm
Pad N
Pad Name
X (mm)
440
810
1250
1865
1865
935
Y (mm)
110
110
110
110
950
950
950
950
1
2
3
4
5
6
7
8
Output
Sense
Shutdown
Ground
Error
XX V tap
Feedback
Input
735
440
Note 1: For LP2950-XX: 8 - connected to Input
1,2 - connected to Output
4
- connected to GND
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