LP2951CM [ONSEMI]
LDO 稳压器，100 mA，带错误标志输出;
| 型号： | LP2951CM |
| 厂家： | 
ONSEMI |
| 描述： | LDO 稳压器，100 mA，带错误标志输出 PC 光电二极管 输出元件 稳压器 调节器 |
| 文件： | 总11页 (文件大小：461K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended
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August 2014
LP2951
Adjustable Micro-Power Voltage Regulator
Description
Features
The LP2951 is an adjustable micro-power voltage regu-
lator suitable for battery-powered systems. This regula-
tor has various functions such as alarm that warns of a
low output voltage often due to falling batteries on the
input, the external shutdown enables the regulator to be
switched on and off, current and temperature limiting.
• Adjustable or Fixed 5 V Output Voltage
• Low Quiescent Current
• Low Dropout Voltage
• Low Temperature Coefficient
• Tight Line and Load Regulation
• Guaranteed 100 mA Output Current
• Internal Short Current and Thermal Limit
• Error Signals of Output Dropout
• External Shut Down
8-SOIC
1
Applications
• Automotive Electronics
• Voltage Reference
Ordering Information
Operating
Part Number
Top Mark
Package
Packing Method
Temperature Range
LP2951CM
-40°C to +125°C
-40°C to +125°C
LP2951CM
LP2951CM
SOIC 8L
SOIC 8L
Rail
LP2951CMX
Tape and Reel
Block Diagram
5V
[3]
1.26V
Figure 1. Block Diagram
© 2002 Fairchild Semiconductor Corporation
LP2951 Rev. 1.1.1
www.fairchildsemi.com
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
VIN
Parameter
Value
-0.3 to 30.0
Internally Limited
127.5
Unit
V
Input Supply Voltage
Power Dissipation
PD
W
RθJA
TSTG
TOPR
Thermal Resistance Junction-to-Air
Storage Temperature Range
°C/W
°C
°C
-65 to 150
-40 to 125
Operating Junction Temperature Range
Electrical Characteristics
FEEDBACK (Pin 7) tied to TAP (Pin 6), VOUT (Pin 1) tied to PROGRAM (Pin 2). Values are at TA = 25°C, unless other-
wise specified.
Symbol
VOUT
Parameter
Fixed Output Voltage
Conditions
IL = 50 mA
Min.
4.9
Typ.
5.0
Max.
5.1
Unit
V
ALL VOLTAGE OPTIONS
Output Voltage Temperature
ΔV/ΔT
50
ppm/°C
Coefficient(1)
(VO + 1) V ≤ VIN ≤ 28 V,
ΔV
ΔV
VD
Line Regulation(2)
Load Regulation(2)
Dropout Voltage
0.4
%
%
IL = 50 mA
100 μA ≤ IL ≤ 100 mA
IL = 100 μA
IL = 100 mA
0.3
150
600
140
7
mV
IL = 100 μA
IL = 100 mA
VO = 0 V
μA
mA
mA
IG
ICL
VREF
IFB
Ground Current
Current Limit
110
165
1.260
1.260
20
220
1.285
1.295
V
IN = (VO + 1) V, IL = 100 μA
1.235
1.225
Reference Voltage
V
(3)
Feedback Bias Current
nA
ERROR COMPARATOR
VOL
VTH
Output Low Voltage
VIN = (VO - 0.5) V, IOL = 400 μA
150
60
400
140
mV
mV
mV
mV
High Threshold Voltage(4)
Low Threshold Voltage(4)
Hysteresis(4)
25
VTL
75
VHYS
15
SHUTDOWN INPUT
VSD Shutdown Threshold Range
(5)
0.6
1.3
30
2.0
100
750
V
VSD = 2.4 V
ISD
Shutdown Input Current
μA
VSD = 28 V
450
Notes:
1. Output or reference voltage temperature coefficient is defined as the worst-case voltage change divided by the total
temperature range.
2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle.
3. VREF ≤ VOUT ≤ (VIN - 1 V), 2.5 V ≤ VIN ≤ 28 V, 100 μA ≤ IL ≤ 100 mA, TA ≤ TAMAX
.
4. Threshold and hysteresis are expressed in terms of voltage differential at the feedback terminal below the normal
reference. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain
= VO / VREF = (R1 + R2) / R2.
5. Vshutdown ≤ 0.6 V, VOUT = ON, Vshutdown ≥ 2.0 V, VOUT = OFF.
© 2002 Fairchild Semiconductor Corporation
LP2951 Rev. 1.1.1
www.fairchildsemi.com
2
Typical Performance Characteristics
6
5
4
3
2
1
0
2.0
1.6
1.2
0.8
0.4
5V OUTPUT
RL=50KΩ
RL=50Ω
0
1
2
3
4
5
6
0.1
1
10
100
INPUT VOLTAGE(V)
LOAD CURRENT(mA)
Figure 2. Quiescent Current
Figure 3. Dropout Characteristics
250
120
100
80
60
40
20
0
RL=50Ω
5V OUTPUT
200
150
100
50
RL=50K
RL=∞
0
0
2
4
6
8
10
0
2
4
6
8
10
I
)
NPUT VOLTAGE(V
INPUT VOLTAGE(V)
Figure 5. Input Current
Figure 4. Input Current
5.06
5.04
5.02
5.00
4.98
4.96
4.94
200
180
160
140
120
100
5V OUTPUT
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE(oC)
TEMPERATURE(oC)
Figure 6. Output Voltage vs. Temperature
Figure 7. Short-Circuit Current
© 2002 Fairchild Semiconductor Corporation
LP2951 Rev. 1.1.1
www.fairchildsemi.com
3
Typical Performance Characteristics (Continued)
600
500
400
300
200
100
0
L
I = 100mA
500
400
300
200
o
J
T = 25 C
L
P
I = 100
A
100
0
-50
-25
0
25
50
75
100
125
0.1
1
10
100
TEMPERATURE(oC)
)
OUTPUT CURRENT(mA
Figure 8. Dropout Voltage
Figure 9. Dropout Voltage
© 2002 Fairchild Semiconductor Corporation
LP2951 Rev. 1.1.1
www.fairchildsemi.com
4
Typical Application
VIN
8
V
IN
5
3
1
ERROR
V
OUT
ERROR
VOUT
LP2951
Co(6)
1μ
SHUTDOWN
SD
GND
R1
R2
F
FB
7
4
VREF
* Pin2 and Pin 6
are left open
VO = VREF (1+ R/ R2)+IFB R1
1
Figure 10. Adjustable Regulator
VIN
8
V
IN
5
3
1
2
ERROR
LP2951
V
OUT
ERROR
VOUT
Program
(6)
Co
1μ
TAP
FB
6
SHUTDOWN
SD
GND
F
7
4
Figure 11. Fixed Output 5 V
Note:
6. CO is required between the output and ground for stability at output voltages of 5 V or more. Since IFB is controlled to
less than 40 nA, the error associated with this term is negligible in most applications. At lower output voltage, more
capacitance is required. without this capacitance the part oscillates.
© 2002 Fairchild Semiconductor Corporation
LP2951 Rev. 1.1.1
www.fairchildsemi.com
5
Typical Application (Continued)
Figure 13. 5 V Regulator with 2.5 V Sleep Function
Figure 12. Wide Input Voltage Range Current Limiter
Figure 15. 5 V Current Limiter
Figure 14. Low Drift Current Source
Figure 16. Latch Off When Error Flag Occurs
Figure 17. Open Circuit Detector for 4 mA to 20 mA
Current Loop
© 2002 Fairchild Semiconductor Corporation
LP2951 Rev. 1.1.1
www.fairchildsemi.com
6
Typical Application (Continued)
PROGRAM
Figure 18. Low Battery Disconnect
© 2002 Fairchild Semiconductor Corporation
LP2951 Rev. 1.1.1
www.fairchildsemi.com
7
Physical Dimensions
Figure 19. 8 Lead, SOIC, JEDEC MS-012, 0.150 inch NARROW BODY
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/dwg/M0/M08A.pdf.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/packing_dwg/PKG-M08A.pdf.
© 2002 Fairchild Semiconductor Corporation
LP2951 Rev. 1.1.1
www.fairchildsemi.com
8
TRADEMARKS
The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidiaries, and is not
intended to be an exhaustive list of all such trademarks.
AccuPower¥
Awinda®
F-PFS¥
®*
FRFET®
®
Global Power ResourceSM
GreenBridge¥
Green FPS¥
Green FPS¥ e-Series¥
Gmax¥
AX-CAP®*
TinyBoost®
TinyBuck®
TinyCalc¥
TinyLogic®
TINYOPTO¥
TinyPower¥
TinyPWM¥
TinyWire¥
TranSiC¥
PowerTrench®
PowerXS™
Programmable Active Droop¥
QFET®
BitSiC¥
Build it Now¥
CorePLUS¥
CorePOWER¥
CROSSVOLT¥
CTL¥
QS¥
GTO¥
Quiet Series¥
RapidConfigure¥
¥
IntelliMAX¥
ISOPLANAR¥
Making Small Speakers Sound Louder
and Better™
MegaBuck¥
MICROCOUPLER¥
MicroFET¥
Current Transfer Logic¥
DEUXPEED®
Dual Cool™
EcoSPARK®
EfficientMax¥
Saving our world, 1mW/W/kW at a time™
SignalWise¥
SmartMax¥
TriFault Detect¥
TRUECURRENT®*
μSerDes¥
SMART START¥
Solutions for Your Success¥
SPM®
ESBC¥
®
MicroPak¥
UHC®
MicroPak2¥
MillerDrive¥
MotionMax¥
MotionGrid®
Fairchild®
STEALTH¥
Ultra FRFET¥
UniFET¥
VCX¥
VisualMax¥
VoltagePlus¥
XS™
Fairchild Semiconductor®
FACT Quiet Series¥
FACT®
SuperFET®
SuperSOT¥-3
SuperSOT¥-6
SuperSOT¥-8
SupreMOS®
MTi®
FAST®
MTx®
FastvCore¥
FETBench¥
FPS¥
MVN®
SyncFET¥
Sync-Lock™
mWSaver®
Xsens™
OptoHiT¥
❺
™
* Trademarks of System General Corporation, used under license by Fairchild Semiconductor.
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Definition of Terms
Datasheet Identification
Product Status
Definition
Datasheet contains the design specifications for product development. Specifications may change
in any manner without notice.
Advance Information
Formative / In Design
Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild
Semiconductor reserves the right to make changes at any time without notice to improve design.
Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve the design.
Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor.
The datasheet is for reference information only.
Preliminary
No Identification Needed
Obsolete
First Production
Full Production
Not In Production
Rev. I71
© Fairchild Semiconductor Corporation
www.fairchildsemi.com
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designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
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