|
|
Part: LP2951CS-3.3
Category:
Power Management
-> Regulators
-> Linear Regulators
-> LDO (Low Drop Out)
Description: Iout = 100mA ;; Vin Min. = 6V ;; Vin Max. = 30V ;; Iq = 150µA ;; Acc = 0.5%, 1% ;; Vdrop = 380mV
Company: Sipex Corporation
Datasheet: Download LP2951CS-3.3 datasheet File size : 606 kB
Request For quote: Find where to buy LP2951CS-3.3
Datasheet text preview:
LP2950/LP2951
100mA Low Dropout Voltage Regulators
· 5.0V and 3.3V Versions at 100mA Output · Very Low Quiescent Current · Low Dropout Voltage: 380mV at 100mA · Extremely Tight Load and Line Regulation · Very Low Temperature Coefficient · Current & Thermal Limiting · Need Only 1 µF for Stability · Offered in TO-92 (LP2950) & SOIC (LP2951) · Direct Replacement For LP2950/LP2951
FEATURES
· Battery Powered Systems · Cordless Telephones · Radio Control Systems · Portable/Palm Top/Notebook Computers · Portable Consumer Equipment · Portable Instrumentation · Avionics · SMPS Post-Regulator · Voltage Reference · Automotive Electronics
APPLICATIONS
LP2951 versions only
· Error Flag Warns of Output Dropout · Logic-Controlled Electronic Shutdown · Output Programmable From 1.24 to 29V
PRODUCT DESCRIPTION
The LP2950 and LP2951 are low power voltage regulators. These devices are an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The LP2950 and LP2951 feature low quiescent current and low dropout voltage (typ. 50mV at light load and 380 mV at 100mA). This includes a tight initial tolerance (0.5% typ.), extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20 ppm/¡C typ.), making the LP2950/LP2951 useful as a low-power voltage reference. The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling input voltage. The logiccompatible shutdown feature enables the regulator to be switched ON and OFF. The LP2950 is offered in a 3-pin TO-92 package compatible with other 5V, 3.3V regulators. The LP2951 is available in an 8-lead SOIC package. Block diagram of LP2951
UNREGULATED DC
+
7
FEEDBACK
8
INPUT
1
OUTPUT
5V @ 100mA MAX
2
SENSE
+ _
FROM CMOS OR TTL
180k 6
ERROR AMPLIFIER 5V TAP
3
SHUTDOWN 60 mV
330k +
60k
+
5
______ ERROR
+ _
ERROR DETECTION COMPARATOR
1µF . .
TO CMOS OR TTL
+ 1.23V
4
REFERENCE GROUND
Rev. 8/6/01
LP2950/51 100mA Low Dropout Voltage Regulators 1
©Copyright 2001 Sipex Corporation
LP2950/51
ABSOLUTE MAXIMUM RATINGS
Power Dissipation....Internally Limited Lead Temp. (Soldering, 5 Seconds)....260¡C Storage Temperature Range ....... -65¡ to +150¡C Operating Junction Temperature Range -40C to +125C Input Supply Voltage.... -0.3V to +30V Feedback Input Voltage...... -1.5V to +30V Shutdown Input Voltage..... -0.3V to +30V Error Comparator Output ............ -0.3V to +30V ESD Rating .......2kV Min
ELECTRICAL CHARACTERISTICS VIN=6V, IO=100µA, COUT=1µF (Note 2) TA=25C, unless otherwise noted.
PARAMETER 3.3 V Versions Output Voltage CONDITIONS LP2950AC LP2951AC Min. Typ. Max. 3.284 3.267 3.260 3.254 3.3 3.3 3.3 3.3 3.317 3.333 3.340 3.346 Min. 3.267 3.251 3.234 3.221 LP2950C LP2951C Typ. Max. 3.3 3.3 3.3 3.3 3.333 3.350 3.366 3.379 UNITS V
TJ = 25¡C -25¡C TJ 85¡C Full Operating Temperature 100 µA IL 100 mA TJ TJMAX TJ = 25¡C -25¡C TJ 85¡C Full Operating Temperature 100 µA IL 100 mA TJ TJMAX
Output Voltage 5 V Versions Output Voltage
V
Output Voltage All Voltage Options Output Voltage Temperature Coefficient Line Regulation (Note 3) Load Regulation (Note 3) Dropout Voltage (Note 5) Ground Current Current Limit Thermal Regulation Output Noise, 10Hz to 100KHz
4.975 4.950 4.940 4.925
5.0 5.0 5.0 5.0
5.025 5.050 5.060 5.075
4.950 4.925 4.900 4.880
5.0 5.0 5.0 5.0
5.050 5.075 5.100 5.120
V
V
20 (Note 1) 6V VIN 30V (Note 4) 100 µA IL 100 mA IL = 100 µA IL = 100 mA IL = 100 µA IL = 100 mA VOUT = 0 CL = 1µF CL = 200 µF CL = 3.3 µF, Bypass = 0.01µF from Pin 7 to Pin 1 (LP2951) 0.03 0.04 50 380 150 8 150 0.05 430 160 100
120 0.1 0.1 80 450 170 12 200 0.2
50 0.04 0.1 50 380 150 8 150 0.05 430 160 100
150 0.2 0.2 80 450 170 12 200 0.2
ppm/¡C % % mV mV µA mA mA %/W µV rms µV rms µV rms
8-Pin Versions only Reference Voltage Reference Voltage Over Temperature (Note 6)
1.220 1.190
LP2951AC 1.235 1.250 1.270
1.210 1.185
LP2951C 1.235 1.260 1.285
V V
Feedback Pin Bias Current
40
60
40
60
nA
Rev. 8/6/01
LP2950/51 100mA Low Dropout Voltage Regulators 2
©Copyright 2001 Sipex Corporation
LP2950/51
PARAMETER 8-Pin Versions only (Continued) Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input logic Voltage Shut down Pin Input Current Regulator Output Current in Shutdown Low (Regulator ON) High (Regulator OFF) VS = 2.4V VS= 30V (Note 8) 1.3 2.0 30 675 3 50 800 10 0.7 2.0 30 675 3 50 800 10 1.3 0.7 V V µA µA µA VOH = 30V VIN = 4.5V IOL = 400µA (Note 7) (Note 7) (Note 7) CONDITIONS (Note 2) Min. LP2951AC Typ. Max. 20 Min. LP2951C Typ. Max. 50 UNITS ppm/¡C
0.1
0.1
nA/¡C
0.01 150 40 60 75 15
1 250 40 95
0.01 150 60 75 15
1 250
µA mV mV
95
mV mV
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 = 6V, IL = 100µA and CL = 1µF. Additional conditions for the 8-pin versions are feedback tied to 5V tap and output tied to output sense (VOUT = 5V) and VSHUTDOWN 0.8V. Note 3: Regulation 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 the LP2951 is tested at IL = 1mA. For IL = 100 µA 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 100 mV 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), 2.3 VIN30V, 100µAIL 100mA, TJ TJMAX. Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V 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 95 mV x 5V/1.235 = 384 mV. 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 8: VSHUTDOWN 2V, VIN 30V, VOUT =0, Feedback pin tied to 5V Tap. Note 9: All typical values are not guaranteed. The value could vary from lot to lot.
Rev. 8/6/01
LP2950/51 100mA Low Dropout Voltage Regulators 3
©Copyright 2001 Sipex Corporation
Others parts begin by lp
LP-1 LP-2 LP-3 LP-4 LP-5 LP-6 LP-7 LP-8 LP-9 LP-10 LP-11 LP-12 LP-13 LP-14 LP-15 LP-16 LP-17 LP-18 LP-19 LP-20
|
|
|
