LP2950, LP2951, NCV2951 100 mA, Low Power Low Dropout Voltage Regulator
The LP2950 and LP2951 are micropower voltage regulators that are specifically designed to maintain proper regulation with an extremely low input−to−output voltage differential. The devices feature a very low quiescent bias current of 75 m A and are capable of supplying output currents in excess of 100 mA. Internal current and thermal limiting protection is provided.
The LP2951 has three additional features. The first is the Error Output that can be ud to signal external circuitry of an out of regulation condition, or as a microprocessor power−on ret. The cond feature allows the output voltage to be pret to 5.0 V, 3.3 V or 3.0 V output (depending on the version) or programmed from 1.25 V to 29 V. It consists of a pinned out resistor divider along with direct access to the Error Amplifier feedback input. The third feature is a Shutdown input that allows a logic level signal to turn−off or turn−on the regulator output.
Due to the low input−to−output voltage differential and bias current specifications, the devices are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of uful battery life is desirable. The LP2950 is available in the three pin ca 29 and DPAK packages, and the LP2951 is available in the eight pin dual−in−line, SOIC−8 and Micro8 surface mount packages. The ‘A’ suffix devices feature an initial output voltage tolerance ±0.5%.
Features
•Pb−Free Packages are Available
•Low Quiescent Bias Current of 75 m A
•Low Input−to−Output V oltage Differential of 50 mV at 100 m A and 380 mV at 100 mA
•5.0 V, 3.3 V or 3.0 V ±0.5% Allows U as a Regulator or Reference •Extremely Tight Line and Load Regulation
•Requires Only a 1.0 m F Output Capacitor for Stability •Internal Current and Thermal Limiting
•NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes
LP2951 Additional Features
•Error Output Signals an Out of Regulation Condition •Output Programmable from 1.25 V to 29 V
•Logic Level Shutdown Input
(See Following Page for Device Information.)
See detailed ordering and shipping information in the package dimensions ction on pages 14 and 16 of this data sheet. See general marking information in the device marking ction on page 18 of this data sheet.
ORDERING & MARKING INFORMATION
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DEVICE INFORMATION
Package Output Voltage
Operating Ambient Temperature Range 3.0 V
3.3 V
5.0 V
Adjustable TO−92Suffix Z LP2950CZ−3.0LP2950ACZ−3.0LP2950CZ−3.3LP2950ACZ−3.3LP2950CZ−5.0LP2950ACZ−5.0Not
Available T A = −40° to +125°C DPAK Suffix DT LP2950CDT−3.0LP2950ACDT−3.0
LP2950CDT−3.3LP2950ACDT−3.3LP2950CDT−5.0LP2950ACDT−5.0Not
Available T A = −40° to +125°C SOIC−8−
NCV2951ACD−3.3R2NCV2951ACDR2NCV2951CDR2T A = −40° to +125°C SOIC−8Suffix D LP2951CD−3.0LP2951ACD−3.0LP2951CD−3.3LP2951ACD−3.3LP2951CD LP2951ACD LP2951CD LP2951ACD T A = −40° to +125°C Micro8Suffix DM LP2951CDM−3.0LP2951ACDM−3.0LP2951CDM−3.3LP2951ACDM−3.3LP2951CDM LP2951ACDM LP2951CDM LP2951ACDM T A = −40° to +125°
C DIP−8Suffix N
LP2951CN−3.0LP2951ACN−3.0
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LP2951CN−3.3LP2951ACN−3.3
LP2951CN LP2951ACN
LP2951CN LP2951ACN
T A = −40° to +125°C
LP2950Cx−xx / LP2951Cxx−xx 1% Output Voltage Precision at T A = 25°C LP2950ACx−xx / LP2951ACxx−xx
0.5% Output Voltage Precision at T A = 25°C
宝贝英文怎么说Figure 1. Reprentative Block Diagrams
Battery or Unregulated DC
5.0 V/100 mA
To CMOS/TTL
MAXIMUM RATINGS (T A = 25°C, unless otherwi noted.)
Rating Symbol Value Unit Input Voltage V CC30Vdc Peak Transient Input Voltage (t < 20 ms)V CC32Vdc Power Dissipation and Thermal Characteristics
Maximum Power Dissipation P D Internally Limited W Ca 751(SOIC−8) D Suffix
Thermal Resistance, Junction−to−Ambient R q JA180°C/W Thermal Resistance, Junction−to−Ca R q JC45°C/W Ca 369A (DPAK) DT Suffix (Note 1)
Thermal Resistance, Junction−to−Ambient R q JA92°C/W Thermal Resistance, Junction−to−Ca R q JC 6.0°C/W Ca 29 (TO−226AA/TO−92) Z Suffix
Thermal Resistance, Junction−to−Ambient R q JA160°C/W Thermal Resistance, Junction−to−Ca R q JC83°C/W Ca 626 N Suffix
Thermal Resistance, Junction−to−Ambient R q JA105°C/W Ca 846A (Micro8) DM Suffix
Thermal Resistance, Junction−to−Ambient R q JA240°C/W Feedback Input Voltage V fb−1.5 to +30Vdc Shutdown Input Voltage V sd−0.3 to +30Vdc Error Comparator Output Voltage V err−0.3 to +30Vdc Operating Ambient Temperature Range T A−40 to +125°C Maximum Die Junction Temperature Range T J+150°C Storage Temperature Range T stg−65 to +150°C Stress exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stress above the Recommended Operating Conditions may affect device reliability.
ELECTRICAL CHARACTERISTICS(V in = V O + 1.0 V, I O = 100 m A, C O = 1.0 m F, T A = 25°C [Note 3],
unless otherwi noted.)
Characteristic Symbol Min Typ Max Unit Output Voltage, 5.0 V Versions V O V V in= 6.0 V, I O= 100 m A, T A= 25°C
LP2950C−5.0/LP2951C/NCV2951C* 4.950 5.000 5.050
LP2950AC−5.0/LP2951AC/NCV2951AC* 4.975 5.000 5.025
T A = −40 to +125°C
LP2950C−5.0/LP2951C/NCV2951C* 4.900− 5.100
LP2950AC−5.0/LP2951AC/NCV2951AC* 4.940− 5.060
V in= 6.0 to 30 V, I O = 100 m A to 100 mA, T A = −40 to +125°C
LP2950C−5.0/LP2951C/NCV2951C* 4.880− 5.120
LP2950AC−5.0/LP2951AC/NCV2951AC* 4.925− 5.075
Output Voltage, 3.3 V Versions V O V V in= 4.3 V, I O= 100 m A, T A= 25°C
LP2950C−3.3/LP2951C−3.3 3.267 3.300 3.333
LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3* 3.284 3.300 3.317
T A= −40 to +125°C
LP2950C−3.3/LP2951C−3.3 3.234− 3.366
LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3* 3.260− 3.340
V in= 4.3 to 30 V, I O = 100 m A to 100 mA, T A= −40 to +125°C
fastenerLP2950C−3.3/LP2951C−3.3 3.221− 3.379宝贝英文
LP2950AC−3.3/LP2951AC−3.3/NCV2951AC−3.3* 3.254− 3.346
Output Voltage, 3.0 V Versions V O V V in= 4.0 V, I O= 100 m A, T A= 25°C
LP2950C−3.0/LP2951C−3.0 2.970 3.000 3.030
LP2950AC−3.0/LP2951AC−3.0 2.985 3.000 3.015
T A = −40 to +125°C
LP2950C−3.0/LP2951C−3.0 2.940− 3.060
LP2950AC−3.0/LP2951AC−3.0 2.964− 3.036
V in= 4.0 to 30 V, I O = 100 m A to 100 mA, T A = −40 to +125°C
LP2950C−3.0/LP2951C−3.0 2.928− 3.072
kuso是什么意思
LP2950AC−3.0/LP2951AC−3.0 2.958− 3.042
1.The Junction−to−Ambient Thermal Resistance is determined by PCB copper area per Figure 29.
2.This device ries contains ESD protection and exceeds the following tests:
Human Body Model (HBM), 2000 V, Class 2, JESD22 A114−C
Machine Model (MM), 200 V, Class B, JESD22 A115−A
Charged Device Model (CDM), 2000 V, Class IV, JESD22 C101−C
3.Low duty pul techniques are ud during test to maintain junction temperature as clo to ambient as possible.
4.V O(nom) is the part number voltage option.
5.Noi tests on the LP2951 are made with a 0.01 m F capacitor connected across Pins 7 and 1.
*NCV prefix is for automotive and other applications requiring site and change control.
ELECTRICAL CHARACTERISTICS (continued) (V in = V O + 1.0 V, I O = 100 m A, C O = 1.0 m F, T A = 25°C [Note 8],
unless otherwi noted.)
Characteristic Symbol Min Typ Max Unit Line Regulation (V in = V O(nom) +1.0 V to 30 V) (Note 9)Reg line% LP2950C−XX/LP2951C/LP2951C−XX/NCV2951C*−0.080.20
LP2950AC−XX/LP2951AC/LP2951AC−XX/NCV2951AC*−0.040.10
Load Regulation (I O = 100 m A to 100 mA)Reg load% LP2950C−XX/LP2951C/LP2951C−XX/NCV2951C*−0.130.20
LP2950AC−XX/LP2951AC/LP2951AC−XX/NCV2951AC*−0.050.10
Dropout Voltage V I− V O mV
I O = 100 m A−3080
I O = 100 mA−350450
Supply Bias Current I CC
I O = 100 m A−93120m A
I O = 100 mA− 4.012mA Dropout Supply Bias Current (V in= V O(nom) − 0.5 V,
I CCdropout−110170m A
I O = 100 m A) (Note 9)
Current Limit (V O Shorted to Ground)I Limit−220300mA Thermal Regulation Reg thermal−0.050.20%/W Output Noi Voltage (10 Hz to 100 kHz) (Note 10)V n m Vrms
C L = 1.0 m F−126−
C L = 100 m F−56−
LP2951A/LP2951AC Only
Reference Voltage (T A = 25°C)V ref V LP2951C/LP2951C−XX/NCV2951C* 1.210 1.235 1.260
LP2951AC/LP2951AC−XX/NCV2951AC* 1.220 1.235 1.250
Reference Voltage (T A = −40to +125°C)V ref V LP2951C/LP2951C−XX/NCV2951C* 1.200− 1.270
LP2951AC/LP2951AC−XX/NCV2951AC* 1.200− 1.260
Reference Voltage (T A = −40to +125°C)V ref V
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I O = 100 m A to 100 mA, V in = 23 to 30 V
LP2951C/LP2951C−XX/NCV2951C* 1.185− 1.285
LP2951AC/LP2951AC−XX/NCV2951AC* 1.190− 1.270
Feedback Pin Bias Current I FB−1540nA Error Comparator
Output Leakage Current (V OH = 30 V)I lkg−0.01 1.0m A Output Low Voltage (V in = 4.5 V, I OL = 400 m A)V OL−150250mV Upper Threshold Voltage (V in= 6.0 V)V thu4045−mV Lower Threshold Voltage (V in= 6.0 V)V thl−6095mV Hysteresis (V in = 6.0 V)V hy−15−mV Shutdown Input
Input Logic Voltage V shtdn V Logic “0” (Regulator “On”)0−0.7
Logic “1” (Regulator “Off”) 2.0−30 Shutdown Pin Input Current I shtdn m A V shtdn= 2.4 V−3550
V shtdn = 30 V−450600
Regulator Output Current in Shutdown Mode I off− 3.010m A (V in = 30 V, V shtdn= 2.0 V, V O = 0, Pin 6 Connected to Pin 7)
奥巴马告别演讲6.The Junction−to−Ambient Thermal Resistance is determined by PCB copper area per Figure 29.
7.ESD data available upon request.
8.Low duty pul techniques are ud during test to maintain junction temperature as clo to ambient as possible.
9.V O(nom) is the part number voltage option.
10.Noi tests on the LP2951 are made with a 0.01 m F capacitor connected across Pins 7 and 1.
*NCV prefix is for automotive and other applications requiring site and change control.
DEFINITIONS
Dropout Voltage − The input/output voltage differential at which the regulator output no longer maintains regulation against further reductions in input voltage. Measured when the output drops 100 mV below its nominal value (which is measured at 1.0 V differential), dropout voltage is affected by junction temperature, load current and minimum input supply requirements.
Line Regulation − The change in output voltage for a change in input voltage. The measurement is made under conditions of low dissipation or by using pul techniques such that average chip temperature is not significantly affected.
Load Regulation − The change in output voltage for a change in load current at constant chip temperature.
Maximum Power Dissipation − The maximum total device dissipation for which the regulator will operate within specifications.
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Bias Current − Current which is ud to operate the regulator chip and is not delivered to the load.
Output Noi Voltage − The RMS ac voltage at the output, with constant load and no input ripple, me
asured over a specified frequency range.
Leakage Current − Current drawn through a bipolar transistor collector−ba junction, under a specified collector voltage, when the transistor is “off”.
Upper Threshold Voltage − V oltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal,which caus the comparator output to change state from a logic “0” to “1”.
Lower Threshold Voltage − V oltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal,which caus the comparator output to change state from a logic “1” to “0”.
Hysteresis − The difference between Lower Threshold voltage and Upper Threshold voltage.
中译英在线翻译器, O U T P U T V O L T A G E (V )
V o u t − 50
T A , AMBIENT TEMPERATURE (°C)
L P 2950/L P 2951 B I A S C U R R E N T (m A )
Figure 4. Output Voltage versus Temperature
50
100
150
200
V in , INPUT VOLTAGE (V)
Figure 5. 5.0 V Dropout Characteristics with
R L = 50 W
1.0
2.0
3.0
4.0
6.0
5.0
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