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100mA Low Dropout Voltage Regulators
CORPORATION
LP2950 / LP2951
FEATURES PRODUCT DESCRIPTION The Calogic 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 features very low quiescent current and very low dropout voltage (Typ. 50mV at light load and 380mV at 100mA). This includes a tight initial tolerance of 0.5% typ., extremely good load and line regulation 0.05% typ. and very low output temperature coefficient, making the LP2950/LP2951 useful as a low-power voltage reference. The error flag output feature is used as power-on reset for warning of a low output voltage, due to falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The LP2950 is offered in a 3-pin TO-92 package compatible with other 5V, 3.0V, 3.3V regulators. The LP2951 is also available in 8-pin plastic and SO-8. The regulator output voltage may be pin-strapped for 5V, 3V or 3.3 volts or programmed from 1.24 volt to 29 volts with an external pair of resistors. Use of AS's design, processing and testing techniques make our LP2950 and LP2951 superior over similar products. ORDERING INFORMATION PART LP2950ACN-X LP2950CN-X LP2951ACP-X LP2951CP-X LP2951ACS-X LP2951CS-X PACKAGE TEMPERATURE RANGE IND. IND. IND. IND. IND. IND. TO-92 (3-Pin) TO-92 (3-Pin) Plastic DIP (8-Pin) Plastic DIP (8-Pin) Plastic SOIC (8-Pin) Plastic SOIC (8-Pin)
* 5V, 3.3V, and 3.0V Versions at 100mA Output * Very Low Quiescent Current * Low Dropout Voltage and Line Regulation * Extremely Tight Load * Very Low Temperature Coefficient and Thermal Limiting * CurrentOnly 1F for Stability * Needs * * *
LP2951 Versions Only Error Flag Warns of Output Dropout Logic-Controlled Electronic Shutdown Output Programmable from 1.24 to 29V
APPLICATIONS
* 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
X = 3.0V, 3.3V or 5.0V
PIN CONNECTIONS
8-PIN SURFACE MOUNT
OUTPUT SENSE SHUTDOWN GROUND 1 2 LP2951 3 4 TOP VIEW 6 5 5V OR 3.3V TAP ERROR 8 7 INPUT FEEDBACK
TO-92
1 2 3 1. OUTPUT 2. GROUND 3. INPUT
BOTTOM VIEW
1D-19
1D-20
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
ABSOLUTE MAXIMUM RATINGS Power Dissipation . . . . . . . . . . . . . . . . . . . . . Internally Limited Lead Temp. (Soldering, 5 Seconds) . . . . . . . . . . . . . . . 260 oC Storage Temperature Range . . . . . . . . . . . . . . . -65 to +150oC Operating Junction Temperature Range LP2951. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150oC LP2950AC/LP2950C LP2951AC/LP2951C . . . . . . . . . . . . . . . . . . . -40 to +125oC 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 ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2KV Min
ELECTRICAL CHARACTERISTICS: VS = 15V, TA = 25oC, unless otherwise specified.
PARAMETER 3V VERSIONS 2.985 Output Voltage 2.964 Output Voltage 3.3V VERSIONS 3.284 Output Voltage 3.260 Output Voltage 5V VERSIONS 4.975 Output Voltage 4.94 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 8-PIN VERSIONS ONLY Reference Voltage Reference Voltage Feedback Pin Bias Current Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient 1.22 1.19 40 20 0.1 20 0.03 0.04 50 380 150 8 130 0.05 430 160 100 LP2951 1.235 1.25 1.27 60 1.22 1.19 40 20 0.1 120 0.1 0.1 80 450 170 12 200 0.2 20 0.03 0.04 50 380 150 8 130 0.05 430 160 100 LP2951AC 1.235 1.25 1.27 60 1.21 1.185 40 50 0.1 0.1 0.1 80 450 170 12 200 0.2 50 0.04 0.1 50 380 150 8 130 0.05 430 160 100 LP2951C 1.235 1.26 1.285 60 V V nA ppm/oC nA/oC (Note 7) Over Temperature (Note 6) 0.2 0.2 80 450 170 12 200 0.2 ppm/oC % % mV mV A mA mA %/W Vrms Vrms Vrms CL = 1F CL = 200F CL = 13.3F
(Bypass = 0.01F pins 7 to 1 (LP2951))
LP2951 MIN TYP 3.0 MAX 3.015 3.036 3.0 3.045
LP2950AC / LP2951AC LP2950C / LP2951C MIN 2.985 2.970 2.964 2.958 TYP 3.0 3.0 3.0 3.0 MAX 3.015 3.030 3.036 3.042 MIN 2.970 2.955 2.940 2.928 TYP 3.0 3.0 3.0 3.0 MAX 3.030 3.045 3.060 3.072
UNITS
CONDITIONS (Note 2) TJ = 25oC -25oC TJ 85oC Full Operating Temperature 100A IL 100mA TJ TJMAX TJ = 25oC -25oC TJ 85oC Full Operating Temperature 100A IL 100mA TJ TJMAX TJ = 25oC -25oC TJ 85oC Full Operating Temperature 100A IL 100mA TJ TJMAX
V V V V
2.955
3.3
3.317 3.340
3.284 3.267 3.260 3.254
3.3 3.3 3.3 3.3
3.317 3.333 3.340 3.346
3.267 3.251 3.234 3.221
3.3 3.3 3.3 3.3
3.333 3.350 3.366 3.379
V V V V
3.251
3.3
3.350
5.0
5.025 5.06
4.975 4.95 4.94 4.93
5.0 5.0 5.0 5.0
5.025 5.050 5.06 5.07
4.95 4.925 4.90 4.88
5.0 5.0 5.0 5.0
5.05 5.075 5.10 5.12
V V V V
4.925
5.0
5.075
(Note 1) 6V VIN 30V (Note 4) 100A IL 100mA IL = 100A IL = 100mA IL = 100A IL = 100mA VOUT = 0
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
ELECTRICAL CHARACTERISTICS (continued)
PARAMETER ERROR COMPARATOR Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis SHUTDOWN INPUT Input Logic Voltage Shutdown Pin Input Current Regulator Output Current in Shutdown MIN LP2951 TYP MAX 0.01 150 60 75 15 1.3 2 30 675 3 50 800 10 1 250 40 95 LP2950AC / LP2951AC LP2950C / LP2951C MIN TYP MAX MIN TYP MAX 0.01 150 60 75 15 1.3 2 30 675 3 50 800 10 1 250 40 95 0.01 150 60 75 15 1.3 2 30 675 3 50 800 10 1 250 95 UNITS A mV mV mV mV V V A A A CONDITIONS (Note 2) VOH = 30V VIN = 4.5V, IOL = 400A (Note 7) (Note 7) (Note 7) Low (Regulator ON) High (Regulator OFF) VS = 2.4V VS = 30V (Note 9)
40
0.6
0.7
0.7
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 = 25oC, VIN = 6V, I L=100A and CL = 1F. 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 150 oC for IL = 1mA. For I L = 100A and TJ = 125 oC, 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 input account. Note 6: VREF VOUT (VIN - 1V), 2.3 VIN 30V, 100A I L 100mA, TJ T JMAX. 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 = 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 95mV x 5V/1.235 = 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 8: VSHUTDOWN 2V, VIN 30V, VOUT = 0, Feedback pin tied to 5V Tap. Note 9: All typical values are not guaranteed.
BLOCK DIAGRAM
UNREGULATED DC 7 FEEDBACK 8 INPUT 1 OUTPUT 2 SENSE + 3 FROM CMOS OR TTL SHUTDOWN + 60mV + 1.23V REFERENCE GROUND LP2950 AND LP2951 BLOCK DIAGRAM
1D-21
+
5V @ 100mA MAX
-
ERROR AMPLIFIER
180k
6 5V TAP 330k + 1F TO CMOS OR TTL
60k + - ERROR DETECTION COMPARATOR
5 ERROR 4
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
APPLICATION HINTS EXTERNAL CAPACITORS
* The
stability of the LP2950/LP2951 requires a 1.0F or greater capacitor between output and ground. Oscillation could occur without this capacitor. Most types of tantalum or aluminum electrolytic are acceptable. For operations below -25oC a solid tantalum is recommended since the many aluminum types have electrolytes that freeze at about -30oC. The ESR of about 5 or less and resonant frequency about 500kHz are the most important parameters in the value of the capacitor. The capacitors value may be increased without limit.
The error comparator has an open-collector output which requires an external pullup resistor. Depending on the system requirements the resistor may be returned to 5V output or other supply voltage. In determining the value of this resistor, note that the output is rated to sink 400A, this value adds to battery drain in a low battery condition. Suggested values range from 100K to 1M. If the output is unused this resistor is not required. PROGRAMMING THE OUTPUT VOLTAGE OF LP2951 The LP2951 may be pin-strapped for 5V using its internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5V Tap). Also, it may be programmed for any output voltage between its 1.235V reference and its 30V maximum rating. As seen in Figure 2, an external pair of resistors is required. Refer to the equation below for the programming of the output voltage: VOUT = VREF x (1 + R1\R2) + IFBR1 The VREF is 1.235 and IFB is the feedback bias current, nominally -20nA. The minimum recommended load current of 1A forces an upper limit of 1.2M on value of R2. If no load is presented the IFB produces an error of typically 2% in VOUT which may be eliminated at room temperature by trimming R1. To improve the accuracy choose the value of R2 = 100k this reduces the error by 0.17% and increases the resistor program current by 12A. Since the LP2951 typically draws 60A at no load with Pin 2 open-circuited this is a small price to pay. REDUCING OUTPUT NOISE It may be an advantage to reduce the AC noise present at the output. One way is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only way that noise can be reduced on the lead 3 of LP2950, but is relatively inefficient, as increasing the capacitor from 1F to 220F only decreases the noise from 430V to 160Vrms for a 100kHz bandwidth at 5V output. Noise could also be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. CBYPASS 1/2R1 x 200Hz or choose 0.01F. When doing this, the output capacitor must be increased to 3.3F to maintain stability. These changes reduce the output noise from 430V to 100Vrms for a 100kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher voltages.
* At lower values of output current, less output capacitance is
required for stability. For currents below 10mA the value of the capacitor can be reduced to 0.33F and 0.1F for 1mA. More output capacitance is needed for the 8-pin version at voltages below 5V since it runs the error amplifier at lower gain.
* At
worst case 3.3F or greater must be used for the condition of 100mA load at 1.23V output.
* The LP2950, unlike other low dropout regulators will remain
stable and in regulation with no load in addition to the internal voltage divider. This feature is especially important in applications like CMOS RAM keep-alive circuits. When setting the output voltage of the LP2951 version with external resistors, a minimum load of 1A is recommended.
* If
there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the input then a 1A tantalum or aluminum electrolytic capacitor should be placed from the input to the ground. can occur if there is a stray capacitance to the LP2951 feedback terminal (pin 7). This could cause more problems when using a higher value of external resistors to set the output voltage. This problem can be eliminated by adding a 100pF capacitor between output and feedback and increasing the output capacitor to at least 3.3F.
* Instability
ERROR DETECTION COMPARATOR OUTPUT The Comparator produces a logic low output whenever the LP2951 output falls out of regulation by more than around 5%. This occurs at approximately 60mV offset divided by the 1.235 reference voltage. This trip level remains 5% below normal regardless of the programmed output voltage of the regulator. Figure 1 shows the timing diagram depicting the ERROR signal and the regulator output voltage as the LP2951 input is ramped up and down. The ERROR signal becomes low at around 1.3V input, and goes high around 5V input (input voltage at which VOUT = 4.75). Since the LP2951's dropout voltage is load dependent, the input voltage trip point (around 5V) will vary with the load current. The output voltage trip point (approx. 4.75V) does not vary with load.
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
TYPICAL PERFORMANCE CHARACTERISTICS
QUIESCENT CURRENT
OUTPUT VOLTAGE (VOLTS)
10 GROUND PIN CURRENT (mA)
6 5
DROPOUT CHARACTERISTICS
5V OUTPUT INPUT CURRENT (A)
250 225 200 175 150 125 100 75 50 25
INPUT CURRENT
5V OUTPUT RL = 50k
1
4 RL = 50k 3 RL = 50 2 1 0
RL =
0.1
0.01 0.1
0 0 1 2 3 4 5 INPUT VOLTAGE (VOLTS) 6
1D-23
1.0 10 LOAD CURRENT (mA)
100
1D-22
0
1
2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (VOLTS) 1D-24
120 5V OUTPUT 110 RL = 50 100 90 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (VOLTS) 1D-25
INPUT CURRENT
5.06 5.04 5.02 5.0 4.98 4.96
OUTPUT VOLTAGE vs TEMPERATURE OF 3 REPRESENTATIVE UNITS
5V OUTPUT QUIESCENT CURRENT (A)
160 140 120 100 80 60 40 20 0 0
QUIESCENT CURRENT
5V OUTPUT
OUTPUT VOLTAGE (V)
INPUT CURRENT (mA)
IL = 1mA IL = 0
0.2%
4.94 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) 1D-26
1
2 3 4 5 6 7 INPUT VOLTAGE (VOLTS)
8
1D-27
170 SHORT CIRCUIT CURRENT (mA) 160 150 140 130 120 110
SHORT CIRCUIT CURRENT
DROPOUT VOLTAGE (mV)
600 500 400 300 100 50
DROPOUT VOLTAGE
DROPOUT VOLTAGE (mV)
500
DROPOUT VOLTAGE
400
IL = 100mA
300
200 TJ = 25C 100
IL = 100A
100 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) 1D-28
0 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) 1D-29
0 100A
1mA 10mA OUTPUT CURRENT
100mA
1D-30
120 QUIESCENT CURRENT (A) 110 100 90 80 70 60
QUIESCENT CURRENT
5V OUTPUT QUIESCENT CURRENT (mA)
10
QUIESCENT CURRENT
5V OUTPUT QUIESCENT CURRENT (mA)
8 7 6 5 4 3 2 1 0 0
QUIESCENT CURRENT
5V OUTPUT
9 VIN = 6V IL = 100mA 8
VIN = 6V IL = 100A
IL = 100mA
50 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) 1D-31
7 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) 1D-32
1
2 3 4 5 6 INPUT VOLTAGE (V)
7
8
1D-33
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
LP2951 MINIMUM OPERATING VOLTAGE LP2951 FEEDBACK BIAS CURRENT
FEEDBACK CURRENT (A)
MINIMUM OPERATING VOLTAGE (V)
2.2 2.1 2.0 1.9 1.8 1.7
20
50
LP2951 FEEDBACK PIN CURRENT
BIAS CURRENT (nA)
10
PIN 7 DRIVEN BY EXTERNAL SOURCE 0 (REGULATROR RUN OPEN LOOP)
-50 TA = 125C -100 -150 TA = 25C -200 TA = -55C -250 0 0.5 -2.0 -1.5 -1.0 -0.5 FEEDBACK VOLTAGE (V)
0
-10
-20
1.6 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) 1D-34
-30 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) 1D-35
1.0
1D-36
8 COMPARATOR OUTPUT (V)
LP2951 ERROR COMPARATOR OUTPUT
VOUT = 5V SINK CURRENT (mA)
2.5
LP2951 COMPARATOR SINK CURRENT
TA = 125C
100mV OUTPUT VOLTAGE CHANGE 50mV 0
LINE TRANSIENT RESPONSE
6
2.0
4 HYSTERESIS 2
1.5
TA = 25C
-50mV 8V 6V 4V 0 200 400 TIME (s)
CL = 1A IL = 1mA VOUT = 5V
1.0 TA = -55C 0.5
0
NOTE: PULLUP RESISTOR TO SEPARATE 5V SUPPLY
-2 0
1
4 2 3 INPUT VOLTAGE (V)
5
1D-37
0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 OUTPUT LOW VOLTAGE (V) 1D-38
INPUT VOLTAGE
600
800
1D-39
10 OUTPUT IMPEDANCE (OHMS) 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 10
OUTPUT IMPEDANCE
IO = 100A IO = 1mA IO = 100mA
90 RIPPLE REJECTION (dB) 80 70 60 50 40
RIPPLE REJECTION
90 RIPPLE REJECTION (dB) 80 70 60 50 40 30
RIPPLE REJECTION
CL = 1F VIN = 6V VOUT = 5V IL = 1mA
IL = 0
VOUT = 5V CL = 1A
IL = 100A CL = 1F
30 VIN = 6V 100 1K 10K 100K FREQUENCY (Hz) 1M
1D-40
20 101
VOUT = 5V 10 2 103 104 105 FREQUENCY (Hz) 106
1D-41
IL = 10mA 20 101 10 2 103 104 105 FREQUENCY (Hz) 106
1D-42
250 OUTPUT VOLTAGE CHANGE (mV) 200 150 100 50 0 -50 -100 100mA 100A 0
LOAD TRANISENT RESPONSE
OUTPUT VOLTAGE CHANGE (mV)
80 60 40 20 0 -20 -40 -60 100mA 100A 0
LOAD TRANSIENT RESPONSE
OUTPUT VOLTAGE (V)
7 6 5 4 3 2
LP2951 ENABLE TRANSIENT
CL = 1F
IL = 10mA VIN = 8V CL = 10F VOUT = 5V
LOAD CURRENT
LOAD CURRENT
CL = 1F VOUT = 5V
CL = 10F VOUT = 5V
SHUTDOWN PIN VOLTAGE (V)
1 0 2 0 -2 -100 0
1
2 3 TIME (ms)
4
5
1D-43
4
8 12 TIME (ms)
16
20
1D-44
100 200 300 400 500 600 700 TIME (s) 1D-45
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
TYPICAL APPLICATIONS
4.75V OUTPUT VOLTAGE
100K
+VIN
8 5 +VIN ERROR VOUT 1 1.2 TO 30V
ERROR*
ERROR OUTPUT
LP2951 + SHUTDOWN INPUT 3 SD GND FB 7 1.23V VREF R2
1F-45
R1 .01F 4
3.3F
5.0V INPUT VOLTAGE 1.3V
*SEE APPLICATION INFO.
1F-44
FIGURE 1. ERROR OUTPUT TIMING
FIGURE 2. ADJUSTABLE REGULATOR
+VIN
+VIN
470K 5 470K ERROR
8 +VIN VOUT 1 VOUT
8 ERROR OUTPUT 5 +VIN ERROR VOUT 1 *VOUT = VIN
LP2951 + 3 SD GND 4 FB 7 R1 1F
LP2951 SHUTDOWN INPUT 3
SD GND 4 FB 7
R2
*MINIMUM INPUT - OUTPUT VOLTAGE RANGES FROM 4mV TO 400mV. DEPENDING ON LOAD CURRENT. CURRENT LIMIT IS TYPICALLY 160mA.
LATCH OFF WHEN ERROR FLAG OCCURS
1F-46
WIDE INPUT VOLTAGE RANGE CURRENT LIMITER
1F-47
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
TYPICAL APPLICATIONS (continued)
+
6V SEALED LEADACID BATTERY SOURCE
120K
1.5K IN457
8 +VIN VOUT 1 MAIN V-
FB
CLM385 LP2951
400K FOR 5.5V 100K 3 SD
MEMORY V+ SENSE + 1F 20K NI-CAD BACKUP BATTERY
GND 4
LOW BATTERY DISCONNECT
1G-24
39k
5
8
2 SENSE VOUT
LP2951 1
+VIN
ERROR RESET
+VOUT = 5V
+ 1F
- + C4
3
SD
7 TAP
6
GND 39k
4
1%
100k
-
C1 +
100k
6V LEADACID BATTERY
<5.8V**
1%
1k
-
100k
C2 +
<6.0V**
1%
1k
-
100k
C3 +
<6.2V** 10k R3 1% 20k
*OPTIONAL LATCH OFF WHEN DROPOUT OCCURS. ADJUST R3 FOR C2 SWITCHING WHEN VIN IS 6.0V. **OUTPUTS GO LOW WHEN VIN DROPS BELOW DESIGNATED THRESHHOLDS.
REGULATOR WITH STATE-OF-CHARGE INDICATOR
1G-25
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
TYPICAL APPLICATIONS (continued)
+VIN
8 AUX SHUTDOWN INPUT OFF ON 3 +VIN SD ERROR 5
10K 5 DEGREE SHUTDOWN FLAG
LP2951 1
VOUT GND 4 + TEMP SENSOR AS35 - FB 7
EXTERNAL CIRCUIT PROTECTED FROM OVER TEMPERATURE (V+ GOES OFF WHEN TEMP > 125)
OR
RELAY
8.2K
SYSTEM OVER TEMPERATURE PROTECTION CIRCUIT
1F-48
+5v 4 20mA 4.7mA
UNREGULATED INPUT
8 +VIN VOUT IN4001 LP2951 0.1F FB GND 4 IN457 MIN VOLTAGE = 4V OPEN CIRCUIT DETECTOR FOR 4mA TO 20mA CURRENT LOOP
1F-49
OUTPUT 1
5
IN
VOUT
1
330K 2N5432 27K
LP2951
7
2
3
VTAP FB 7
SENSE GND 4
2 + 4.7F
5V OUTPUT
360K
LOAD 50mA TO 300mA
300mA REGULATOR WITH 0.75 DROPOUT
1F-50
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
LP2950 / LP2951
CORPORATION
SCHEMATIC DIAGRAM
IN
FEEDBACK
R18 20k Q15A Q15B 3 Q25 Q9 Q3 Q4 Q5 R11 20.6 k 2 Q2 Q20 R8 31.4k R10 150 k Q22 Q21 C2 40pF R15 100k 3 Q23 Q7 Q8 Q16 1 Q17 1 2 Q14 R17 12k 24 Q24 Q26 3 OUT
R11 18 k C1 20pF
SENSE R27 182k 5V TAP R28 60k
Q6 Q1 10 R1 20k R2 50k
Q42
R5 180 k Q13
R6 140 k Q12
R9 27.8k R12 110 k Q11 Q29 Q18 Q19 Q28 6 R13 100 k R14 350 k
Q40 4 R30 30k
Q41
R16 30k
R17 10
R3 50k
R4 13k
R21 8
Q30 Q31 Q37 ERROR Q36 R22 150k R24 50k
R23 60k
SHDN
Q38 4 R26 60k 2 Q39
Q34 5 R25 2.8 k GND
-- -- -- DENOTES CONNECTION ON LP2950 ONLY
1G-01
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

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