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| Order this document by LP2950/D LP2950 LP2951 Micropower Voltage Regulators 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. These devices feature a very low quiescent bias current of 75 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 used to signal external circuitry of an out of regulation condition, or as a microprocessor power-on reset. The second feature allows the output voltage to be preset 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, these devices are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable. The LP2950 is available in the three pin case 29 and DPAK packages, and the LP2951 is available in the eight pin dual-in-line, SO-8 and Micro-8 surface mount packages. The `A' suffix devices feature an initial output voltage tolerance 0.5%. LP2950 and LP2951 Features: MICROPOWER LOW DROPOUT VOLTAGE REGULATORS Z SUFFIX PLASTIC PACKAGE CASE 29 (TO-226AA/TO-92) 1 2 3 Pin: 1. Output 2. Ground 3. Input DT SUFFIX PLASTIC PACKAGE CASE 369A (DPAK) 1 3 1 2 3 Pin: 1. Input 2. Ground 3. Output * * * * * * * * * Low Quiescent Bias Current of 75 A Low Input-to-Output Voltage Differential of 50 mV at 100 A and 380 mV at 100 mA 5.0 V, 3.3 V or 3.0 V 0.5% Allows Use as a Regulator or Reference Extremely Tight Line and Load Regulation Requires Only a 1.0 F Output Capacitor for Stability Internal Current and Thermal Limiting (Top View) Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. D SUFFIX PLASTIC PACKAGE CASE 751 (SO-8) 8 1 LP2951 Additional Features: Error Output Signals an Out of Regulation Condition Output Programmable from 1.25 V to 29 V Logic Level Shutdown Input N SUFFIX PLASTIC PACKAGE CASE 626 8 1 DM SUFFIX PLASTIC PACKAGE CASE 846A (Micro-8) 8 1 Output 1 Sense 2 Shutdown 3 Gnd 4 (See Following Page for Ordering Information.) (c) Motorola, Inc. 1996 8 7 6 5 (Top View) Input Feedback VO Tap Error Output Rev 4 MOTOROLA ANALOG IC DEVICE DATA 1 LP2950 LP2951 ORDERING INFORMATION Device LP2950CZ-** LP2950ACZ-** LP2950CDT-** LP2950ACDT-** LP2951CD LP2951ACD LP2951CD-** LP2951ACD-** LP2951CN LP2951ACN LP2951CN-** LP2951ACN-** LP2951CDM LP2951ACDM LP2951CDM-** LP2951ACDM-** Type Operating Temperature Range Package TO-92/TO-226AA Fixed Voltage (3.0, 3.3 or 5.0 V) Adjustable or 5.0 V Fixed Adjustable or Fixed (3.0, 3.3 V) (3 0 3 3 Adjustable or 5.0 V Fixed Adjustable or Fixed (3.0, 3.3 V) (3 0 3 3 Adjustable or 5.0 V Fixed Adjustable or Fixed (3.0, 3.3 V) (3 0 3 3 Micro-8 Micro 8 TJ = -40 to +125C 40 125C Plastic SO-8 SO 8 DPAK ** = Voltage option of 3.0, 3.3 or 5.0 V. DEVICE TYPE/NOMINAL OUTPUT VOLTAGE Device No. (1%) LP2950CX-5.0 LP2950CX-3.3 LP2950CX-3.0 LP2951CX LP2950CX-3.3 LP2951CX-3.0 X = Package suffix. Device No. (0.5%) LP2950ACX-5.0 LP2950ACX-3.3 LP2950ACX-3.0 LP2951ACX LP2951ACX-3.3 LP2951ACX-3.0 Nominal Voltage 5.0 3.3 3.0 Adjustable or 5.0 Adjustable or 3.3 Adjustable or 3.0 Representative Block Diagrams Input Battery or Unregulated DC 3 182 k Error Amplifier 1.23 V Reference Gnd Battery or Unregulated DC Input 8 2 Output 1 Sense 182 k 2 5.0 V/100 mA 1.0 F VO Tap 6 60 k 7 Error Amplifier 60 k 50 k 75 mV/ 60 mV Feedback 330 k Output 1 5.0 V/100 mA 1.0 F 60 k LP2950CZ-5.0 Shutdown From 3 CMOS/TTL Error Output To CMOS/TTL 5 1.23 V Reference Gnd 4 Error Detection Comparator LP2951CD or CN This device contains 34 active transistors. 2 MOTOROLA ANALOG IC DEVICE DATA LP2950 LP2951 MAXIMUM RATINGS (TA = 25C, unless otherwise noted.) AAA A AA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAA A AA Input Voltage VCC PD 30 Vdc W Power Dissipation and Thermal Characteristics Maximum Power Dissipation Case 751(SO-8) D Suffix Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 369A (DPAK) DT Suffix [Note 1] Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 29 (TO-226AA/TO-92) Z Suffix Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 626 N Suffix Thermal Resistance, Junction-to-Ambient Case 846A (Micro-8) DM Suffix Thermal Resistance, Junction-to-Ambient Feedback Input Voltage Internally Limited 180 45 92 6.0 160 83 105 240 -1.5 to +30 -0.3 to +30 -0.3 to +30 RJA RJC RJA RJC RJA RJC RJA RJA Vfb Vsd C/W C/W C/W C/W C/W C/W C/W C/W Vdc Vdc Vdc C C Rating Symbol Value Unit AAA AA AAAAAAAAAAAAAAAAAAAAAAA A AA AAA A AA AAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAA AAAAA A AAAAAAAAAAAAAAAAAAAAAAA A AA AA AAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAA A Shutdown Input Voltage Error Comparator Output Voltage Operating Junction Temperature Storage Temperature Range Verr TJ -40 to +125 -65 to +150 Tstg NOTE: 1. The Junction-to-Ambient Thermal Resistance is determined by PC board copper area per Figure 26. 2. ESD data available upon request. ELECTRICAL CHARACTERISTICS (Vin = VO + 1.0 V, IO = 100 A, CO = 1.0 F, TJ = 25C [Note 1], unless otherwise noted.) Characteristic Output Voltage, 5.0 V Versions Vin = 6.0 V, IO = 100 A, TJ = 25C LP2950C-5.0/LP2951C LP2950AC-5.0/LP2951AC TJ = - 40 to +125C LP2950C-5.0/LP2951C LP2950AC-5.0/LP2951AC Vin = 6.0 to 30 V, IO = 100 A to 100 mA, TJ = - 40 to +125C LP2950C-5.0/LP2951C LP2950AC-5.0/LP2951AC Output Voltage, 3.3 V Versions Vin = 4.3 V, IO = 100 A, TJ = 25C LP2950C-3.3/LP2951C-3.3 LP2950AC-3.3/LP2951AC-3.3 TJ = - 40 to +125C LP2950C-3.3/LP2951C-3.3 LP2950AC-3.3/LP2951AC-3.3 Vin = 4.3 to 30 V, IO = 100 A to 100 mA, TJ = - 40 to +125C LP2950C-3.3/LP2951C-3.3 LP2950AC-3.3/LP2951AC-3.3 Output Voltage, 3.0 V Versions Vin = 4.0 V, IO = 100 A, TJ = 25C LP2950C-3.0/LP2951C-3.0 LP2950AC-3.0/LP2951AC-3.0 TJ = - 40 to +125C LP2950C-3.0/LP2951C-3.0 LP2950AC-3.0/LP2951AC-3.0 Vin = 4.0 to 30 V, IO = 100 A to 100 mA, TJ = - 40 to +125C LP2950C-3.0/LP2951C-3.0 LP2950AC-3.0/LP2951AC-3.0 Symbol VO 4.950 4.975 4.900 4.940 4.880 4.925 VO 3.267 3.284 3.234 3.260 3.221 3.254 VO 2.970 2.985 2.940 2.964 2.928 2.958 3.000 3.000 - - - - 3.030 3.015 3.060 3.036 3.072 3.042 3.300 3.300 - - - - 3.333 3.317 3.366 3.340 3.379 3.346 V 5.000 5.000 - - - - 5.050 5.025 5.100 5.060 5.120 5.075 V Min Typ Max Unit V MOTOROLA ANALOG IC DEVICE DATA 3 LP2950 LP2951 ELECTRICAL CHARACTERISTICS (continued) (Vin = VO + 1.0 V, IO = 100 A, CO = 1.0 F, TJ = 25C [Note 1], unless otherwise noted.) Characteristic Line Regulation (Vin = VO(nom) +1.0 V to 30 V) [Note 2] LP2950C-XX/LP2951C/LP2951C-XX LP2950AC-XX/LP2951AC/LP2951AC-XX Load Regulation (IO = 100 A to 100 mA) LP2950C-XX/LP2951C/LP2951C-XX LP2950AC-XX/LP2951AC/LP2951AC-XX Dropout Voltage IO = 100 A IO = 100 mA Supply Bias Current IO = 100 A IO = 100 mA Dropout Supply Bias Current (Vin = VO(nom) - 0.5 V, IO = 100 A) [Note 2] Current Limit (VO Shorted to Ground) Thermal Regulation Output Noise Voltage (10 Hz to 100 kHz) [Note 3] CL = 1.0 F CL = 100 F LP2951A/LP2951AC ONLY Reference Voltage (TJ = 25C) LP2951C/LP2951C-XX LP2951AC/LP2951AC-XX Reference Voltage (TJ = - 40 to +125C) LP2951C/LP2951C-XX LP2951AC/LP2951AC-XX Reference Voltage (TJ = - 40 to +125C) IO = 100 A to 100 mA, Vin = 23 to 30 V LP2951C/LP2951C-XX LP2951AC/LP2951AC-XX Feedback Pin Bias Current ERROR COMPARATOR Output Leakage Current (VOH = 30 V) Output Low Voltage (Vin = 4.5 V, IOL = 400 A) Upper Threshold Voltage (Vin = 6.0 V) Lower Threshold Voltage (Vin = 6.0 V) Hysteresis (Vin = 6.0 V) SHUTDOWN INPUT Input Logic Voltage Logic "0" (Regulator "On") Logic "1" (Regulator "Off") Shutdown Pin Input Current Vshtdn = 2.4 V Vshtdn = 30 V Regulator Output Current in Shutdown Mode (Vin = 30 V, Vshtdn = 2.0 V, VO = 0, Pin 6 Connected to Pin 7) Vshtdn 0 2.0 Ishtdn - - Ioff - 35 450 3.0 50 600 10 A - - 0.7 30 A V Ilkg VOL Vthu Vthl Vhy - - 40 - - 0.01 150 45 60 15 1.0 250 - 95 - A mV mV mV mV Vref 1.210 1.220 Vref 1.200 1.200 Vref 1.185 1.190 IFB - - - 15 1.285 1.270 40 nA - - 1.270 1.260 V 1.235 1.235 1.260 1.250 V V Symbol Regline - - Regload - - VI - VO - - ICC - - ICCdropout ILimit Regthermal Vn - - - - - 93 4.0 110 220 0.05 126 56 120 12 170 300 0.20 - - 30 350 80 450 A mA A mA %/W Vrms 0.13 0.05 0.20 0.10 mV 0.08 0.04 0.20 0.10 % Min Typ Max Unit % NOTES: 1. Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 2. VO(nom) is the part number voltage option. 3. Noise tests on the LP2951 are made with a 0.01 F capacitor connected across Pins 7 and 1. 4 MOTOROLA ANALOG IC DEVICE DATA LP2950 LP2951 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 pulse 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. Bias Current - Current which is used to operate the regulator chip and is not delivered to the load. Figure 1. Quiescent Current 10 LP2950/LP2951 BIAS CURRENT (mA) 6.0 5.0 Vout , OUTPUT VOLTAGE (V) 1.0 4.0 3.0 2.0 1.0 0 RL = 50 LP2951C TA = 25C RL = 50 k Output Noise Voltage - The rms ac voltage at the output, with constant load and no input ripple, measured over a specified frequency range. Leakage Current - Current drawn through a bipolar transistor collector-base junction, under a specified collector voltage, when the transistor is "off". Upper Threshold Voltage - Voltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal, which causes the comparator output to change state from a logic "0" to "1". Lower Threshold Voltage - Voltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal, which causes the comparator output to change state from a logic "1" to "0". Hysteresis - The difference between Lower Threshold voltage and Upper Threshold voltage. Figure 2. Dropout Characteristics 0.1 0.01 0.1 1.0 10 100 0 1.0 2.0 3.0 4.0 5.0 6.0 IL, LOAD CURRENT (mA) Vin, INPUT VOLTAGE (V) Figure 3. Input Current 250 200 BIAS CURRENT ( A) 0.1 mA Load Current 150 100 No Load 50 0 0 5.0 10 15 20 25 Vin, INPUT VOLTAGE (V) 5.00 4.99 4.98 4.97 4.96 Figure 4. Output Voltage versus Temperature Vout , OUTPUT VOLTAGE (V) LP2951C 4.95 - 50 0 50 100 150 TA, AMBIENT TEMPERATURE (C) MOTOROLA ANALOG IC DEVICE DATA 5 LP2950 LP2951 Figure 5. Dropout Voltage versus Output Current 400 DROPOUT VOLTAGE (mV) TA = 25C DROPOUT VOLTAGE (mV) R L= 50 350 300 250 200 150 100 50 0 0.1 1.0 10 100 550 500 450 400 350 300 - 50 Figure 6. Dropout Voltage versus Temperature 55 50 45 40 35 30 150 DROPOUT VOLTAGE (mV) R L= 50 k OUTPUT VOLTAGE CHANGE (mV) OUTPUT VOLTAGE CHANGE (mV) RL = 50 RL = 50 k 0 50 T, TEMPERATURE (C) 100 IO, OUTPUT CURRENT (mA) Figure 7. Error Comparator Output 5.0 Vout , OUTPUT VOLTAGE (V) 4.0 3.0 2.0 1.0 0 4.70 LP2951C RL = 330 k TA = 25C Vin Decreasing Vin Increasing 8.0 7.5 7.0 6.5 6.0 5.5 Figure 8. Line Transient Response Vin 4.0 2.0 0 - 2.0 TA = 25C CL = 1.0 F IL = 1.0 mA VO = 5.0 V 0 100 200 300 400 t, TIME (s) 500 600 700 - 4.0 - 6.0 800 Vin , INPUT VOLTAGE (V) Vout 4.74 4.78 4.82 4.86 4.90 Vin, INPUT VOLTAGE (V) Figure 9. LP2951 Enable Transient SHUTDOWN AND OUTPUT VOLTAGE (V) 7.0 6.0 5.0 4.0 3.0 2.0 1.0 Shutdown Input 0 -1.0 -100 0 100 200 300 400 - 50 0 CL = 10 F TA = 25C IL = 10 mA Vin = 8.0 V Vout = 5.0 V CL = 1.0 F LOAD CURRENT (mA) 200 Figure 10. Load Transient Response CL = 1.0 F Vout = 5.0 V 150 TA = 25C 100 50 0 ILoad - 200 - 400 50 100 150 200 t, TIME (ms) 250 300 350 400 Vout 400 200 0 t, TIME (s) 6 MOTOROLA ANALOG IC DEVICE DATA LP2950 LP2951 Figure 11. Ripple Rejection 80 VOLTAGE NOISE ( V/ Hz) 4.0 CL = 1.0 F 3.0 Figure 12. Output Noise IL= 100 mA TA = 25C VO = 5.0 V LP2951C RIPPLE REJECTION (dB) 60 IL= 0.1 mA 40 T = 25C 20 C A = 1.0 F L Vin = 6.0 V Vout = 5.0 V 0 1.0 10 2.0 1.0 CL = 100 F 100 1.0 k 10 k 100 k 0 100 1.0 k 10 k 100 k f, FREQUENCY (Hz) f, FREQUENCY (Hz) Figure 13. Shutdown Threshold Voltage versus Temperature SHUTDOWN THRESHOLD VOLTAGE (V) 1.8 1.6 1.4 1.2 1.0 0.8 - 40 - 20 Output "Off" Output "On" Vout , OUTPUT CURRENT (mA) 100 80 60 40 20 LP2951CN 0 0 5.0 Figure 14. Maximum Rated Output Current 4.0 TA = 25C TA = 75C 2.0 0 - 2.0 - 4.0 - 6.0 40 OUTPUT VOLTAGE CHANGE (mV) 0 20 40 60 80 100 120 140 160 10 15 20 25 30 35 t, TEMPERATURE (C) Vin, INPUT VOLTAGE (V) MOTOROLA ANALOG IC DEVICE DATA 7 LP2950 LP2951 APPLICATIONS INFORMATION Introduction The LP2950/LP2951 regulators are designed with internal current limiting and thermal shutdown making them user-friendly. Typical application circuits for the LP2950 and LP2951 are shown in Figures 17 through 25. These regulators are not internally compensated and thus require a 1.0 F (or greater) capacitance between the LP2950/LP2951 output terminal and ground for stability. Most types of aluminum, tantalum or multilayer ceramic will perform adequately. Solid tantalums or appropriate multilayer ceramic capacitors are recommended for operation below 25C. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.33 F for currents less than 10 mA, or 0.1 F for currents below 1.0 mA. Using the 8-pin versions at voltages less than 5.0 V operates the error amplifier at lower values of gain, so that more output capacitance is needed for stability. For the worst case operating condition of a 100 mA load at 1.23 V output (Output Pin 1 connected to the feedback Pin 7) a minimum capacitance of 3.3 F is recommended. The LP2950 will remain stable and in regulation when operated with no output load. When setting the output voltage of the LP2951 with external resistors, the resistance values should be chosen to draw a minimum of 1.0 A. A bypass capacitor is recommended across the LP2950/LP2951 input to ground if more than 4 inches of wire connects the input to either a battery or power supply filter capacitor. Input capacitance at the LP2951 Feedback Pin 7 can create a pole, causing instability if high value external resistors are used to set the output voltage. Adding a 100 pF capacitor between the Output Pin 1 and the Feedback Pin 7 and increasing the output filter capacitor to at least 3.3 F will stabilize the feedback loop. Error Detection Comparator The comparator switches to a positive logic low whenever the LP2951 output voltage falls more than approximately 5.0% out of regulation. This value is the comparator's designed-in offset voltage of 60 mV divided by the 1.235 V internal reference. As shown in the representative block diagram. This trip level remains 5.0% below normal regardless of the value of regulated output voltage. For example, the error flag trip level is 4.75 V for a normal 5.0 V regulated output, or 9.50 V for a 10 V output voltage. Figure 1 is a timing diagram which shows the ERROR signal and the regulated output voltage as the input voltage to the LP2951 is ramped up and down. The ERROR signal becomes valid (low) at about 1.3 V input. It goes high when the input reaches about 5.0 V (Vout exceeds about 4.75 V). Since the LP2951's dropout voltage is dependent upon the load current (refer to the curve in the Typical Performance Characteristics), the input voltage trip point will vary with load current. The output voltage trip point does not vary with load. The error comparator output is an open collector which requires an external pull-up resistor. This resistor may be returned to the output or some other voltage within the system. The resistance value should be chosen to be consistent with the 400 A sink capability of the error comparator. A value between 100 k and 1.0 M is suggested. No pull-up resistance is required if this output is unused. 8 When operated in the shutdown mode, the comparator output will go high if it has been pulled up external supply. To avoid this invalid response, the comparator output should be pulled up to Vout Figure 15). Figure 15. ERROR Output Timing 5.0 V Output Voltage 4.75 V 4.70 V error to an error (see ERROR Not Valid Not Valid Pull-Up to Ext Pull-Up to Vout 4.75 V + Vdropout Input Voltage 4.70 V + Vdropout 1.3 V 1.3 V Programming the Output Voltage (LP2951) The LP2951CX may be pin-strapped for 5.0 V using its internal voltage divider by tying Pin 1 (output) to Pin 2 (sense) and Pin 7 (feedback) to Pin 6 (5.0 V tap). Alternatively, it may be programmed for any output voltage between its 1.235 reference voltage and its 30 V maximum rating. An external pair of resistors is required, as shown in Figure 16. Figure 16. Adjustable Regulator Vin 100 k Error Output 5 Error 8 Vin Vout SNS 1 2 6 NC R1 NC 0.01 F Vout 1.23 to 30 V 3.3 F Shutdown Input 3 SD Gnd 4 VO T FB 7 R2 The complete equation for the output voltage is: V out + Vref (1 ) R1 R2) ) IFB R1 where Vref is the nominal 1.235 V reference voltage and IFB is the feedback pin bias current, nominally - 20 nA. The minimum recommended load current of 1.0 A forces an upper limit of 1.2 M on the value of R2, if the regulator must work with no load. IFB will produce a 2% typical error in Vout which may be eliminated at room temperature by adjusting R1. For better accuracy, choosing R2 = 100 k reduces this MOTOROLA ANALOG IC DEVICE DATA LP2950 LP2951 error to 0.17% while increasing the resistor program current to 12 A. Since the LP2951 typically draws 75 A at no load with Pin 2 open circuited, the extra 12 A of current drawn is often a worthwhile tradeoff for eliminating the need to set output voltage in test. Output Noise In many applications it is desirable to reduce the noise present at the output. Reducing the regulator bandwidth by increasing the size of the output capacitor is the only method for reducing noise on the 3 lead LP2950. However, increasing the capacitor from 1.0 F to 220 F only decreases the noise from 430 V to 160 Vrms for a 100 kHz bandwidth at the 5.0 V output. Noise can be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick C Bypass Figure 17. 1.0 A Regulator with 1.2 V Dropout Unregulated Input 1.0 F MTB23P06E 10 k 0.01 F Vout 5.0 V 1.0% 0 to 1.0 A Vout 1 2 6 220 F Error Output 5 Error 8 Vin SNS LP2951CN Shutdown Input 3 SD Gnd 4 VO T FB 7 [ 1 2pR1 x 200 Hz 0.002 F 1.0 M 2.0 k or about 0.01 F. When doing this, the output capacitor must be increased to 3.3 F to maintain stability. These changes reduce the output noise from 430 V to 126 Vrms for a 100 kHz bandwidth at 5.0 V output. With bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. MOTOROLA ANALOG IC DEVICE DATA 9 LP2950 LP2951 TYPICAL APPLICATIONS Figure 18. Lithium Ion Battery Cell Charger Figure 19. Low Drift Current Sink +V = 2.0 to 30 V Unregulated Input 6.0 to 10 Vdc IL 8 Vin 4.2 V 0.025 V 2.0 M 1.0% 806 k 1.0% 50 k Gnd R 1.0 F 8 Vin Error 0.1 F Vout 1 Load IL = 1.23/R NC 5 Error Vout 1 NC NC 1N4001 2 SNS LP2951CN 0.1 F 3 6 SD VO T Gnd 4 FB 7 330 pF Error Output Lithium Ion Rechargeable Cell 5 2.2 F Shutdown Input 2 SNS LP2951CN 3 6 SD VO T Gnd 4 FB 7 Figure 20. Latch Off When Error Flag Occurs +Vin Figure 21. 5.0 V Regulator with 2.5 V Sleep Function +Vin *Sleep Input CMOS Gate 470 k 2N3906 5 470 k Reset Normally Closed Error 8 Vin Vout 1 2 6 NC NC R1 Vout 47 k Error Output 5 Error 8 Vin 470 k Vout 1 2 6 NC NC 100 k 100 pF 7 100 k 2N3906 Vout SNS LP2951CN 3 SD Gnd 4 VO T FB 7 SNS LP2951CN 1.0 F Shutdown Input 3 SD Gnd 4 VO T FB 200 k 3.3 F R2 Error flag occurs when Vin is too low to maintain Vout, or if Vout is reduced by excessive load current. 10 MOTOROLA ANALOG IC DEVICE DATA LP2950 LP2951 Figure 22. Regulator with Early Warning and Auxiliary Output +Vin 8 Vin Error 5 Vout 1 D1 D2 1.0 F 20 Memory V+ 3.6 V NiCad NC 2 SNS LP2951CN #1 3 6 SD VO T Gnd 4 FB 7 27 k Early Warning D3 Reset P All diodes are 1N4148. Early Warning flag on low input voltage. Main output latches off at lower input voltages. Battery backup on auxiliary output. 2.7 M Q1 2N3906 D4 330 k 5 Error 8 Vin VDD Vout 1 Main Output 1.0 F 2 SNS LP2951CN #2 3 6 SD VO T Gnd 4 FB 7 Operation: Regulator #1's Vout is programmed one diode drop above 5.0 V. Its error flag becomes active when Vin < 5.7 V. When Vin drops below 5.3 V, the error flag of regulator #2 becomes active and via Q1 latches the main output "off". When Vin again exceeds 5.7 V, regulator #1 is back in regulation and the early warning signal rises, unlatching regulator #2 via D3. Figure 23. 2.0 A Low Dropout Regulator Current Limit Section 680 2N3906 2N3906 MJE2955 10 k 4.7 M Error Flag 5 Error 8 Vin .33 F 470 +Vin 0.05 1000 F Vout 1 2 6 NC NC R1 47 4.7 F Tant Vout @ 2.0 A 100 F SNS LP2951CN 220 20 k 3 SD Gnd 4 VO T FB 7 .01 F 0.033 F Vout = 1.25V (1.0 + R1/R2) For 5.0 V output, use internal resistors. Wire Pin 6 to 7, and wire Pin 2 to +Vout Bus. R2 MOTOROLA ANALOG IC DEVICE DATA 11 LP2950 LP2951 Figure 24. Open Circuit Detector for 4.0 to 20 mA Current Loop + 5.0 V 4.7 k Output* 1 4 20 mA 8 Vin Error 5 NC 5 Vout 1 2 6 2 NC NC 4 SNS LP2951CN NC 1N4001 0.1 F 3 SD Gnd 4 VO T FB 7 * High for IL < 3.5 mA 1N457 1N457 1N457 360 Figure 25. Low Battery Disconnect 31.6 k 100 k 2N3906 8 Vin Error 6.0 V Lead-Acid Battery 2 MC34164P-5 3 1 NC 5 Vout 1 2 6 1.0 F NC 20 Main V+ Memory V+ SNS LP2951CN 3 SD Gnd 4 VO T FB 7 NC NiCad Backup Battery Figure 26. DPAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length Free Air Mounted Vertically Minimum Size Pad PD(max) for TA = 50C 2.0 2.0 oz. Copper L L PD, MAXIMUM POWER DISSIPATION (W) 100 R JA, THERMAL RESISTANCE JUNCTION-TO-AIR (C/W) 90 80 70 60 50 RJA 40 0 5.0 10 15 20 L, LENGTH OF COPPER (mm) 2.4 1.6 1.2 0.8 0.4 0 12 III III III III 25 30 MOTOROLA ANALOG IC DEVICE DATA LP2950 LP2951 OUTLINE DIMENSIONS Z SUFFIX PLASTIC PACKAGE CASE 29-04 (TO-226AA/TO-92) ISSUE AD A R P SEATING PLANE B F L K NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. CONTOUR OF PACKAGE BEYOND DIMENSION R IS UNCONTROLLED. 4. DIMENSION F APPLIES BETWEEN P AND L. DIMENSION D AND J APPLY BETWEEN L AND K MINIMUM. LEAD DIMENSION IS UNCONTROLLED IN P AND BEYOND DIMENSION K MINIMUM. DIM A B C D F G H J K L N P R V INCHES MIN MAX 0.175 0.205 0.170 0.210 0.125 0.165 0.016 0.022 0.016 0.019 0.045 0.055 0.095 0.105 0.015 0.020 0.500 --- 0.250 --- 0.080 0.105 --- 0.100 0.115 --- 0.135 --- MILLIMETERS MIN MAX 4.45 5.20 4.32 5.33 3.18 4.19 0.41 0.55 0.41 0.48 1.15 1.39 2.42 2.66 0.39 0.50 12.70 --- 6.35 --- 2.04 2.66 --- 2.54 2.93 --- 3.43 --- XX G H V 1 D J C SECTION X-X N N DT SUFFIX PLASTIC PACKAGE CASE 369A-13 (DPAK) ISSUE Y -T- B V R 4 SEATING PLANE NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. INCHES MIN MAX 0.235 0.250 0.250 0.265 0.086 0.094 0.027 0.035 0.033 0.040 0.037 0.047 0.180 BSC 0.034 0.040 0.018 0.023 0.102 0.114 0.090 BSC 0.175 0.215 0.020 0.050 0.020 --- 0.030 0.050 0.138 --- MILLIMETERS MIN MAX 5.97 6.35 6.35 6.73 2.19 2.38 0.69 0.88 0.84 1.01 0.94 1.19 4.58 BSC 0.87 1.01 0.46 0.58 2.60 2.89 2.29 BSC 4.45 5.46 0.51 1.27 0.51 --- 0.77 1.27 3.51 --- C E S 1 2 3 A K F L D G 2 PL Z U J H 0.13 (0.005) T DIM A B C D E F G H J K L R S U V Z M MOTOROLA ANALOG IC DEVICE DATA 13 LP2950 LP2951 OUTLINE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 626-05 ISSUE K NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.60 6.10 4.45 3.94 0.51 0.38 1.78 1.02 2.54 BSC 1.27 0.76 0.30 0.20 3.43 2.92 7.62 BSC - 10 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC - 10 0.030 0.040 8 5 -B- 1 4 F NOTE 2 -A- L C -T- SEATING PLANE J N D H G 0.13 (0.005) M K T A M M B M D SUFFIX PLASTIC PACKAGE CASE 751-05 (SO-8) ISSUE R NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETERS. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE MOLD PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.18 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_ A 8 D 5 C E 1 4 H 0.25 M B M h B C e A SEATING PLANE X 45 _ q L 0.10 A1 0.25 B M CB S A S q 14 MOTOROLA ANALOG IC DEVICE DATA LP2950 LP2951 OUTLINE DIMENSIONS DM SUFFIX PLASTIC PACKAGE CASE 846A-02 (Micro-8) ISSUE C -A- K -B- NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. MILLIMETERS MIN MAX 2.90 3.10 2.90 3.10 --- 1.10 0.25 0.40 0.65 BSC 0.05 0.15 0.13 0.23 4.75 5.05 0.40 0.70 INCHES MIN MAX 0.114 0.122 0.114 0.122 --- 0.043 0.010 0.016 0.026 BSC 0.002 0.006 0.005 0.009 0.187 0.199 0.016 0.028 PIN 1 ID G D 8 PL 0.08 (0.003) M TB S A S -T- SEATING PLANE 0.038 (0.0015) H C J L DIM A B C D G H J K L MOTOROLA ANALOG IC DEVICE DATA 15 LP2950 LP2951 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola 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. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1-800-441-2447 or 602-303-5454 MFAX: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-81-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 16 MOTOROLA ANALOG IC DEVICE DATA *LP2950/D* LP2950/D |
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