LP2950/LP2951 Series of Adjustable Micropower Voltage Regulators General Description The LP2950 and LP2951 are micropower voltage regulators with very low quiescent current (75 µA typ.) and very low dropout voltage (typ. 40 mV at light loads and 380 mV at 100 mA). They are ideally suited for use in battery-powered systems. Furthermore, the quiescent current of the LP2950/ LP2951 increases only slightly in dropout, prolonging battery life. The LP2950-5.0 in the popular 3-pin TO-92 package is pin-compatible with older 5V regulators. The 8-lead LP2951 is available in plastic, ceramic dual-in-line, or metal can packages and offers additional system functions. One such feature is an error flag output which warns of a low output voltage, often due to falling batteries on the input. It may be used for a power-on reset. A second feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. Also, the part may be pin-strapped for a 5V, 3V, or 3.3V output (depending on the version), or programmed from 1.24V to 29V with an external pair of resistors. Careful design of the LP2950/LP2951 has minimized all contributions to the error budget. This includes a tight initial tolerance (.5% typ.), extremely good load and line regulation (.05% typ.) and a very low output voltage temperature coefficient, making the part useful as a low-power voltage reference. Features n n n n n n n n n n n 5V, 3V, and 3.3V versions available High accuracy output voltage Guaranteed 100 mA output current Extremely low quiescent current Low dropout voltage Extremely tight load and line regulation Very low temperature coefficient Use as Regulator or Reference Needs minimum capacitance for stability Current and Thermal Limiting Stable with low-ESR output capacitors LP2951 versions only n Error flag warns of output dropout n Logic-controlled electronic shutdown n Output programmable from 1.24 to 29V Block Diagram and Typical Applications LP2950 LP2951 DS008546-25 DS008546-1 © 1999 National Semiconductor Corporation DS008546 www.national.com LP2950/LP2951 Series of Adjustable Micropower Voltage Regulators May 1999 Connection Diagrams TO-92 Plastic Package (Z) Dual-In-Line Packages (N, J) Surface-Mount Package (M, MM) DS008546-2 Bottom View DS008546-26 Top View Metal Can Package (H) 10-Lead Ceramic Surface-Mount Package (WG) DS008546-64 Top View DS008546-19 Top View www.national.com 2 Ordering Information Package Output Voltage 3.0V TO-92 (Z) N (N-08E) M (M08A) MM (MUA08A) 3.3V Temperature 5.0V LP2950ACZ-3.0 LP2950ACZ-3.3 LP2950ACZ-5.0 LP2950CZ-3.0 LP2950CZ-3.3 LP2950CZ-5.0 LP2951ACN-3.0 LP2951ACN-3.3 LP2951ACN LP2951CN-3.0 LP2951CN-3.3 LP2951CN LP2951ACM-3.0 LP2951ACM-3.3 LP2951ACM LP2951CM-3.0 LP2951CM-3.3 LP2951CM LP2951ACMM-3.0 LP2951ACMM-3.3 LP2951ACMM LP2951CMM-3.0 LP2951CMM-3.3 LP2951CMM J (J08A) LP2951ACJ (˚C) −40 < TJ < 125 −40 < TJ < 125 −40 < TJ < 125 −40 < TJ < 125 −40 < TJ < 125 LP2951CJ LP2951J −55 < TJ < 150 LP2951J/883 5926-3870501MPA H (H08C) LP2951H/883 −55 < TJ < 150 5962-3870501MGA WG (WG10A) LP2951WG/883 −55 < TJ < 150 5962-3870501MXA For MM Package: Order Number Package Marking LP2951ACMM L0DA LP2951CMM L0DB LP2951ACMM-3.3 L0CA LP2951CMM-3.3 L0CB LP2951ACMM-3.0 L0BA LP2951CMM-3.0 L0BB 3 www.national.com Absolute Maximum Ratings (Note 1) Soldering Dwell Time, Temperature Wave Infrared Vapor Phase ESD If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Supply Voltage SHUTDOWN Input Voltage, Error Comparator Output Voltage, (Note 9) FEEDBACK Input Voltage (Note 9) (Note 10) Power Dissipation Junction Temperature (TJ) Ambient Storage Temperature −0.3 to +30V 4 seconds, 260˚C 10 seconds, 240˚C 75 seconds, 219˚C TBD Operating Ratings (Note 1) Maximum Input Supply Voltage Junction Temperature Range (TJ) (Note 8) LP2951 LP2950AC-XX, LP2950C-XX, LP2951AC-XX, LP2951C-XX −1.5 to +30V Internally Limited +150˚C −65˚ to +150˚C 30V −55˚ to +150˚C −40˚ to +125˚C Electrical Characteristics (Note 2) LP2951 Parameter Conditions (Note 2) Tested Typ Limit Typ (Notes 3, 16) LP2950AC-XX LP2950C-XX LP2951AC-XX LP2951C-XX Tested Design Limit Limit (Note 3) (Note 4) Typ Tested Design Limit Limit (Note 3) (Note 4) Units 3V VERSIONS (Note 17) Output Voltage TJ = 25˚C 3.0 3.015 3.0 2.985 −25˚C ≤ TJ ≤ 85˚C 3.0 Full Operating 3.0 3.015 3.0 2.985 3.030 3.0 3.030 3.0 3.036 Temperature Range Output Voltage 100 µA ≤ IL ≤ 100 mA 2.964 3.0 TJ ≤ TJMAX 3.045 3.045 2.955 V min 3.0 3.060 V max 2.964 3.0 3.042 2.955 V min 3.0 2.970 3.036 V max 2.970 3.0 2.958 V max 2.940 V min 3.072 V max 2.928 V min 3.3V VERSIONS (Note 17) Output Voltage TJ = 25˚C 3.3 3.317 3.3 3.284 −25˚C ≤ TJ ≤ 85˚C 3.3 Full Operating 3.3 3.317 3.3 3.284 3.333 3.3 3.333 3.3 3.340 Temperature Range Output Voltage 100 µA ≤ IL ≤ 100 mA 3.260 3.3 TJ ≤ TJMAX 3.350 3.350 3.251 V min 3.3 3.366 V max 3.260 3.3 3.346 3.251 V min 3.3 3.267 3.340 V max 3.267 3.3 3.254 V max 3.234 V min 3.379 V max 3.221 V min 5V VERSIONS (Note 17) Output Voltage TJ = 25˚C 5.0 5.025 5.0 4.975 −25˚C ≤ TJ ≤ 85˚C 5.0 Full Operating 5.0 5.06 5.0 5.075 5.025 5.0 4.975 5.05 5.0 5.05 5.0 5.06 5.0 5.075 5.0 Temperature Range 100 µA ≤ IL ≤ 100 mA 4.94 TJ ≤ TJMAX V max 4.925 V min 5.0 5.1 V max 4.9 V min 5.0 5.12 V max 4.88 V min 150 ppm/˚C 4.94 4.925 V min 5.075 4.95 Output Voltage V max 4.95 4.925 ALL VOLTAGE OPTIONS Output Voltage Temperature Coefficient (Note 12) Line Regulation (Note 14) Load Regulation (Note 14) www.national.com 20 120 20 (VONOM + 1)V ≤ Vin ≤ 30V (Note 15) 0.03 0.1 0.03 100 µA ≤ IL ≤ 100 mA 0.04 100 0.1 0.5 50 0.04 0.1 0.04 0.3 0.1 4 0.4 0.1 0.2 % max 0.2 0.2 % max % max 0.2 0.3 % max Electrical Characteristics (Note 2) (Continued) LP2951 Parameter Conditions (Note 2) Tested Typ Limit Typ (Notes 3, 16) LP2950AC-XX LP2950C-XX LP2951AC-XX LP2951C-XX Tested Design Limit Limit (Note 3) (Note 4) Typ Tested Design Limit Limit (Note 3) (Note 4) Units ALL VOLTAGE OPTIONS Dropout Voltage (Note 5) IL = 100 µA 80 50 IL = 100 mA Ground IL = 100 µA 80 150 450 150 600 380 75 120 75 8 150 450 600 120 8 12 8 14 600 mV max 140 µA max 14 mA max 120 µA max 140 12 mV max mV max 380 75 140 IL = 100 mA mV max 50 450 380 Current 80 50 12 mA max 14 Dropout Vin = (VONOM − 0.5)V Ground Current IL = 100 µA Current Limit Vout = 0 160 Thermal Regulation (Note 13) 0.05 Output Noise, CL = 1 µF (5V Only) 430 430 430 µV rms 10 Hz to 100 kHz CL = 200 µF 160 160 160 µV rms 100 100 100 µV rms 110 170 110 170 110 200 170 µA max 200 200 160 200 0.05 0.2 220 200 160 200 0.05 0.2 220 0.2 µA max mA max 220 mA max %/W max CL = 3.3 µF (Bypass = 0.01 µF Pins 7 to 1 (LP2951)) 8-PIN VERSIONS ONLY LP2951 Reference 1.235 Voltage LP2951AC-XX 1.25 1.235 1.26 (Note 7) Voltage 20 Bias Current Reference Voltage V max 1.21 V max V min 1.2 1.2 1.2 V min 1.27 1.27 1.285 V max 1.19 40 20 40 60 (Note 12) 1.26 1.27 1.22 1.19 Feedback Pin 1.235 1.26 1.22 Reference LP2951C-XX 1.25 1.185 20 40 60 V min nA max 60 nA max 20 20 50 ppm/˚C 0.1 0.1 0.1 nA/˚C Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient Error Comparator Output Leakage VOH = 30V 0.01 Current Vin = (VONOM − 0.5)V Voltage IOL = 400 µA Upper Threshold (Note 6) 150 1 250 150 250 75 (Note 6) 15 Voltage 1 60 40 150 250 60 40 75 140 95 140 mV max mV min 25 75 15 µA max mV max 400 25 95 µA max 2 400 40 25 (Note 6) 0.01 2 400 60 Voltage Hysteresis 0.01 2 Output Low Lower Threshold 1 95 mV min mV max 140 15 mV max mV Shutdown Input Input 1.3 1.3 1.3 V Logic Low (Regulator ON) 0.6 0.7 0.7 V max Voltage High (Regulator OFF) 2.0 2.0 2.0 V min 5 www.national.com Electrical Characteristics (Note 2) (Continued) LP2951 Parameter Conditions (Note 2) Tested Typ Limit Typ (Notes 3, 16) LP2950AC-XX LP2950C-XX LP2951AC-XX LP2951C-XX Tested Design Limit Limit (Note 3) (Note 4) Typ Tested Design Limit Limit (Note 3) (Note 4) Units Shutdown Input Shutdown Pin Input Current Vshutdown = 2.4V 30 50 30 50 100 Vshutdown = 30V 450 600 450 600 3 10 750 Regulator Output Current in Shutdown (Note 11) 3 30 50 100 450 600 3 10 750 10 20 µA max 100 20 µA max µA max 750 µA max 20 µA max µA max Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical Characteristics tables. Note 2: Unless otherwise specified all limits guaranteed for VIN = (VONOM + 1)V, IL = 100 µA and CL = 1 µF for 5V versions and 2.2 µF for 3V and 3.3V versions. Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25˚C. Additional conditions for the 8-pin versions are FEEDBACK tied to VTAP, OUTPUT tied to SENSE, and VSHUTDOWN ≤ 0.8V. Note 3: Guaranteed and 100% production tested. Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels. 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: Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage measured at Vin = (VONOM + 1)V. 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/1.235V = 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 7: Vref ≤ Vout ≤ (Vin − 1V), 2.3V ≤ Vin ≤ 30V, 100 µA ≤ IL ≤ 100 mA, TJ ≤ TJMAX. Note 8: The junction-to-ambient thermal resistances are as follows: 180˚C/W and 160˚C/W for the TO-92 package with 0.40 inch and 0.25 inch leads to the printed circuit board (PCB) respectively, 105˚C/W for the molded plastic DIP (N), 130˚C/W for the ceramic DIP (J), 160˚C/W for the molded plastic SOP (M), 200˚C/W for the molded plastic MSOP (MM), and 160˚C/W for the metal can package (H). The above thermal resistances for the N, J, M, and MM packages apply when the package is soldered directly to the PCB. Junction-to-case thermal resistance for the H package is 20˚C/W. Note 9: May exceed input supply voltage. Note 10: When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to ground. Note 11: Vshutdown ≥ 2V, Vin ≤ 30V, Vout = 0, Feedback pin tied to VTAP. Note 12: Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Note 13: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 50 mA load pulse at VIN = 30V (1.25W pulse) for T = 10 ms. Note 14: 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 15: Line regulation for the LP2951 is tested at 150˚C for IL = 1 mA. 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 16: A Military RETS specification is available on request. At time of printing, the LP2951 RETS specification complied with the boldface limits in this column. The LP2951H, WG, or J may also be procured as Standard Military Drawing Spec #5962-3870501MGA, MXA, or MPA. Note 17: All LP2950 devices have the nominal output voltage coded as the last two digits of the part number. In the LP2951 products, the 3.0V and 3.3V versions are designated by the last two digits, but the 5V version is denoted with no code at this location of the part number (refer to ordering information table). Typical Performance Characteristics Quiescent Current Dropout Characteristics DS008546-28 DS008546-27 www.national.com Input Current 6 DS008546-29 Typical Performance Characteristics (Continued) Output Voltage vs. Temperature of 3 Representative Units Input Current Quiescent Current DS008546-30 DS008546-32 DS008546-31 Quiescent Current Quiescent Current DS008546-33 Short Circuit Current Quiescent Current DS008546-35 DS008546-34 Dropout Voltage Dropout Voltage DS008546-36 DS008546-37 7 DS008546-38 www.national.com Typical Performance Characteristics LP2951 Minimum Operating Voltage (Continued) LP2951 Feedback Bias Current DS008546-39 LP2951 Error Comparator Output LP2951 Feedback Pin Current DS008546-40 LP2951 Comparator Sink Current DS008546-41 Line Transient Response DS008546-44 DS008546-42 Load Transient Response DS008546-43 Load Transient Response DS008546-45 LP2951 Enable Transient DS008546-46 DS008546-47 www.national.com 8 Typical Performance Characteristics (Continued) Ripple Rejection Output Impedance Ripple Rejection DS008546-48 Ripple Rejection DS008546-49 LP2951 Output Noise DS008546-51 Shutdown Threshold Voltage DS008546-50 LP2951 Divider Resistance DS008546-53 DS008546-52 Line Regulation LP2951 Maximum Rated Output Current DS008546-54 DS008546-55 DS008546-56 LP2950 Maximum Rated Output Current Thermal Response Output Capacitor ESR Range DS008546-58 DS008546-57 DS008546-63 9 www.national.com Application Hints sistor, note that while the output is rated to sink 400 µA, this sink current adds to battery drain in a low battery condition. Suggested values range from 100k to 1 MΩ. The resistor is not required if this output is unused. EXTERNAL CAPACITORS A 1.0 µF (or greater) capacitor is required between the output and ground for stability at output voltages of 5V or more. At lower output voltages, more capacitance is required (2.2 µF or more is recommended for 3V and 3.3V versions). Without this capacitor the part will oscillate. Most types of tantalum or aluminum electrolytics work fine here; even film types work but are not recommended for reasons of cost. Many aluminum electrolytics have electrolytes that freeze at about −30˚C, so solid tantalums are recommended for operation below −25˚C. The important parameters of the capacitor are an ESR of about 5 Ω or less and a resonant frequency above 500 kHz. The value of this capacitor may be increased without limit. At lower values of output current, less output capacitance is required for stability. The capacitor can be reduced to 0.33 µF for currents below 10 mA or 0.1 µF for currents below 1 mA. Using the adjustable versions at voltages below 5V runs the error amplifier at lower gains so that more output capacitance is needed. For the worst-case situation of a 100 mA load at 1.23V output (Output shorted to Feedback) a 3.3 µF (or greater) capacitor should be used. Unlike many other regulators, the LP2950 will remain stable and in regulation with no load in addition to the internal voltage divider. This is especially important in CMOS RAM keep-alive applications. When setting the output voltage of the LP2951 versions with external resistors, a minimum load of 1 µA is recommended. A 1 µF tantalum or aluminum electrolytic capacitor should be placed from the LP2950/LP2951 input to ground 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. Stray capacitance to the LP2951 Feedback terminal can cause instability. This may especially be a problem when using high value external resistors to set the output voltage. Adding a 100 pF capacitor between Output and Feedback and increasing the output capacitor to at least 3.3 µF will fix this problem. DS008546-20 *When VIN ≤ 1.3V, the error flag pin becomes a high impedance, and the error flag voltage rises to its pull-up voltage. Using VOUT as the pull-up voltage (see Figure 2), rather than an external 5V source, will keep the error flag voltage under 1.2V (typ.) in this condition. The user may wish to divide down the error flag voltage using equal-value resistors (10 kΩ suggested), to ensure a low-level logic signal during any fault condition, while still allowing a valid high logic level during normal operation. FIGURE 1. ERROR Output Timing PROGRAMMING THE OUTPUT VOLTAGE (LP2951) The LP2951 may be pin-strapped for the nominal fixed output voltage using its internal voltage divider by tying the output and sense pins together, and also tying the feedback and VTAP pins together. Alternatively, 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. The complete equation for the output voltage is where VREF is the nominal 1.235 reference voltage and IFB is the feedback pin bias current, nominally −20 nA. The minimum recommended load current of 1 µA forces an upper limit of 1.2 MΩ on the value of R2, if the regulator must work with no load (a condition often found in CMOS in standby). IFB will produce a 2% typical error in VOUT which may be eliminated at room temperature by trimming R1. For better accuracy, choosing R2 = 100k reduces this error to 0.17% while increasing the resistor program current to 12 µA. Since the LP2951 typically draws 60 µA at no load with Pin 2 open-circuited, this is a small price to pay. ERROR DETECTION COMPARATOR OUTPUT The comparator produces a logic low output whenever the LP2951 output falls out of regulation by more than approximately 5%. This figure is the comparator’s built-in offset of about 60 mV divided by the 1.235 reference voltage. (Refer to the block diagram in the front of the datasheet.) This trip level remains “5% below normal” regardless of the programmed output voltage of the 2951. For example, the error flag trip level is typically 4.75V for a 5V output or 11.4V for a 12V output. The out of regulation condition may be due either to low input voltage, current limiting, or thermal limiting. Figure 1 below gives a timing diagram depicting the ERROR signal and the regulated output voltage as the LP2951 input is ramped up and down. For 5V versions, the ERROR signal becomes valid (low) at about 1.3V input. It goes high at about 5V input (the input voltage at which VOUT = 4.75V). Since the LP2951’s dropout voltage is load-dependent (see curve in typical performance characteristics), the input voltage trip point (about 5V) will vary with the load current. The output voltage trip point (approx. 4.75V) does not vary with load. The error comparator has an open-collector output which requires an external pullup resistor. This resistor may be returned to the output or some other supply voltage depending on system requirements. In determining a value for this rewww.national.com 10 Application Hints (Continued) DS008546-7 *See Application Hints **Drive with TTL-high to shut down. Ground or leave open if shutdown feature is not to be used. Note: Pins 2 and 6 are left open. FIGURE 2. Adjustable Regulator REDUCING OUTPUT NOISE In reference applications it may be advantageous to reduce the AC noise present at the output. One method is to reduce the regulator bandwidth by increasing the size of the output capacitor. This is the only way noise can be reduced on the 3 lead LP2950 but is relatively inefficient, as increasing the capacitor from 1 µF to 220 µF only decreases the noise from 430 µV to 160 µV rms for a 100 kHz bandwidth at 5V output. Noise can be reduced fourfold by a bypass capacitor across R1, since it reduces the high frequency gain from 4 to unity. Pick or about 0.01 µF. When doing this, the output capacitor must be increased to 3.3 µF to maintain stability. These changes reduce the output noise from 430 µV to 100 µV rms for a 100 kHz bandwidth at 5V output. With the bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. 11 www.national.com Typical Applications 1A Regulator with 1.2V Dropout DS008546-22 300 mA Regulator with 0.75V Dropout Wide Input Voltage Range Current Limiter DS008546-9 DS008546-21 *Minimum input-output voltage ranges from 40 mV to 400 mV, depending on load current. Current limit is typically 160 mA. Low Drift Current Source 5 Volt Current Limiter DS008546-10 *Minimum input-output voltage ranges from 40 mV to 400 mV, depending on load current. Current limit is typically 160 mA. DS008546-8 www.national.com 12 Typical Applications (Continued) Latch Off When Error Flag Occurs Regulator with Early Warning and Auxiliary Output DS008546-12 DS008546-11 j Early warning flag on low input voltage j Main output latches off at lower input voltages j Battery backup on auxiliary output Operation: Reg. #1’s Vout is programmed one diode drop above 5V. Its error flag becomes active when Vin ≤ 5.7V. When Vin drops below 5.3V, the error flag of Reg. #2 becomes active and via Q1 latches the main output off. When Vin again exceeds 5.7V Reg. #1 is back in regulation and the early warning signal rises, unlatching Reg. #2 via D3. 13 www.national.com Typical Applications (Continued) 2 Ampere Low Dropout Regulator DS008546-13 For 5Vout, use internal resistors. Wire pin 6 to 7, & wire pin 2 to +Vout Bus. Open Circuit Detector for 4 → 20 mA Current Loop 5V Regulator with 2.5V Sleep Function DS008546-15 DS008546-14 *High input lowers Vout to 2.5V www.national.com 14 Typical Applications (Continued) Regulator with State-of-Charge Indicator DS008546-16 *Optional Latch off when drop out occurs. Adjust R3 for C2 Switching when Vin is 6.0V. **Outputs go low when Vin drops below designated thresholds. Low Battery Disconnect DS008546-17 For values shown, Regulator shuts down when Vin < 5.5V and turns on again at 6.0V. Current drain in disconnected mode is ≈ 150 µA. *Sets disconnect Voltage **Sets disconnect Hysteresis 15 www.national.com Typical Applications (Continued) System Overtemperature Protection Circuit DS008546-18 LM34 for 125˚F Shutdown LM35 for 125˚C Shutdown www.national.com 16 DS008546-23 Schematic Diagram 17 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted Order Number LP2951WG/883 or 5962-3870501MXA NS Package Number WG10A Metal Can Package (H) Order Number LP2951H/883 or 5962-3870501MGA NS Package Number H08C www.national.com 18 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Ceramic Dual-In-Line Package (J) Order Number LP2951CJ, LP2951ACJ, LP2951J, LP2951J/883 or 5962-3870501MPA NS Package Number J08A Surface Mount Package (M) Order Number LP2951ACM, LP2951CM, LP2951ACM-3.0, LP2951CM-3.0, LP2951ACM-3.3 or LP2951CM-3.3 NS Package Number M08A 19 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LP2951ACN, LP2951CN, LP2951ACN-3.0, LP2951CN-3.0, or LP2951ACN-3.3 or LP2951CN-3.3 NS Package Number N08E Molded TO-92 Package (Z) Order Number LP2950ACZ-3.0 or LP2950CZ-3.0, LP2950ACZ-3.3, LP2950CZ-3.3, LP2950ACZ-5.0 or LP2950CZ-5.0 NS Package Number Z03A www.national.com 20 LP2950/LP2951 Series of Adjustable Micropower Voltage Regulators Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Surface Mount Package (MM) Order Number LP2951ACMM, LP2951CMM, LP2951ACMM-3.0, LP2951CMM-3.0, LP2951ACMM-3.3 or LP2951CMM-3.3 NS Package Number MUA08A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. 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