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LP2950-N, LP2951-N

www.ti.com

SNVS764N –JANUARY 2000–REVISED MAY 2013

LP2950-N/LP2951-N Series of Adjustable Micropower Voltage Regulators

Check for Samples: LP2950-N, LP2951-N

FEATURES

DESCRIPTION

The LP2950-N and LP2951-N are micropower

• 5V, 3V, and 3.3V Versions Available

voltage regulators with very low quiescent current (75

• High Accuracy Output Voltage

μA typ.) and very low dropout voltage (typ. 40 mV at

• Ensured 100 mA Output Current

light loads and 380 mV at 100 mA). They are ideally

suited for use in battery-powered systems.

• Extremely Low Quiescent Current

Furthermore, the quiescent current of the LP2950-

• Low Dropout Voltage

N/LP2951-N increases only slightly in dropout,

• Extremely Tight Load and Line Regulation

prolonging battery life.

• Very Low Temperature Coefficient

The LP2950-N-5.0 is available in the surface-mount

• Use as Regulator or Reference

PFM package, and in the popular 3-pin TO-92

package for pin-compatibility with older 5V regulators.

• Needs Minimum Capacitance for Stability

The 8-lead LP2951-N is available in plastic, ceramic

• Current and Thermal Limiting

dual-in-line, WSON, or metal can packages and

• Stable With Low-ESR Output Capacitors (10

offers additional system functions.

mΩ to 6Ω)

One such feature is an error flag output which warns

of a low output voltage, often due to falling batteries

LP2951-N VERSIONS ONLY

on the input. It may be used for a power-on reset. A

• Error Flag Warns of Output Dropout second feature is the logic-compatible shutdown input

which enables the regulator to be switched on and

• Logic-Controlled Electronic Shutdown

off. Also, the part may be pin-strapped for a 5V, 3V,

• Output Programmable From 1.24 to 29V

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-N/LP2951-N 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.

Block Diagram and Typical Applications

Figure 1. LP2950-N

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (42 pages)

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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 LP2950-N/LP2951-N Series of Adjustable Micropower Voltage Regulators Check for Samples: LP2950-N, LP2951-N FEATURES DESCRIPTION • • • • • • • • • • • The LP2950-N and LP2951-N 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.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com Figure 2. LP2951-N Connection Diagrams Figure 3. TO-92 Plastic Package (LP) Bottom View Figure 6. 10-Lead Ceramic Surface-Mount Package (NAC) Top View Figure 4. Dual-In-Line Packages (P, NAB) Surface-Mount Package (D, DGK) Top View Figure 7. PFM (NDP) Front View 8 OUTPUT 1 INPUT 7 FEEDBACK SENSE 2 DAP SHUTDOWN 3 GND 4 6 VTAP 5 ERROR Figure 5. Metal Can Package (LMC) Top View Connect DAP to GND at device pin 4. Figure 8.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS (1) (2) Input Supply Voltage - SHUTDOWN Input Voltage Error Comparator Output Voltage (3) FEEDBACK Input Voltage (3) (4) −0.3 to +30V −1.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com ELECTRICAL CHARACTERISTICS (1) LP2950AC-XX LP2951AC-XX LP2951 Conditions (1) Parameter Typ Tested Limit (2) (3) Typ Tested Limit (2) LP2950C-XX LP2951C-XX Design Typ Limit (4) Tested Limit (2) Design Limit (4) Units 3V Versions (5) Output Voltage TJ = 25°C 3.0 3.015 3.0 2.985 −25°C ≤ TJ ≤ 85°C 3.0 3.015 3.0 2.985 3.0 3.030 3.030 V max 2.970 V min 3.0 3.045 2.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 ELECTRICAL CHARACTERISTICS(1) (continued) LP2950AC-XX LP2951AC-XX LP2951 Conditions (1) Parameter Load Regulation (7) Typ 100 μA ≤ IL ≤ 100 mA 0.04 Tested Limit (2) (3) 0.1 Typ 0.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com ELECTRICAL CHARACTERISTICS(1) (continued) LP2950AC-XX LP2951AC-XX LP2951 Parameter Conditions (1) Typ Tested Limit (2) (3) Typ Tested Limit (2) LP2950C-XX LP2951C-XX Design Typ Limit (4) Tested Limit (2) Design Limit (4) Units Error Comparator Output Leakage Current VOH = 30V Output Low Voltage Vin = (VONOM − 0.5)V IOL = 400μA 0.01 1 0.01 1 0.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Current Dropout Characteristics Figure 9. Figure 10. Input Current Input Current Figure 11. Figure 12. Output Voltage vs. Temperature of 3 Representative Units Quiescent Current Figure 13. Figure 14.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 8 Quiescent Current Quiescent Current Figure 15. Figure 16. Quiescent Current Short Circuit Current Figure 17. Figure 18. Dropout Voltage Dropout Voltage Figure 19. Figure 20.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) LP2951-N Minimum Operating Voltage LP2951-N Feedback Bias Current Figure 21. Figure 22. LP2951-N Feedback Pin Current LP2951-N Error Comparator Output Figure 23. Figure 24. LP2951-N Comparator Sink Current Line Transient Response Figure 25. Figure 26.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) 10 Load Transient Response Load Transient Response Figure 27. Figure 28. LP2951-N Enable Transient Output Impedance Figure 29. Figure 30. Ripple Rejection Ripple Rejection Figure 31. Figure 32.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Ripple Rejection LP2951-N Output Noise Figure 33. Figure 34. LP2951-N Divider Resistance Shutdown Threshold Voltage Figure 35. Figure 36. Line Regulation LP2951-N Maximum Rated Output Current Figure 37. Figure 38.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) LP2950-N Maximum Rated Output Current Thermal Response Figure 39. Figure 40. Output Capacitor ESR Range LP2951-N Input Pin Current vs Input Voltage INPUT PIN CURRENT, IIN( A) 120 VSD= 2.0V Output Load = Open 100 80 60 40 Ta= -50°C Ta= -40°C Ta= +25°C Ta= +125°C 20 0 0 5 10 15 20 25 INPUT PIN VOLTAGE, VIN(V) Figure 41. 30 Figure 42.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 APPLICATION HINTS Output Capacitor Requirements A 1.0 μF (or greater) capacitor is required between the output and ground for stability at output voltages of 5V or higher. At lower output voltages, more capacitance is required (2.2 μF or more is recommended for 3.0V and 3.3V versions). Without this capacitor the part will oscillate.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com value output capacitors when the condition is removed, and the recommended generic solution is to set the output capacitor to a value not less than 10 μF. Although the 10 μF value for COUT may not eliminate the output voltage over-shoot in all cases, it should lower it to acceptable levels (<10% of VOUT(NOM)) in the majority of cases.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 *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 47), rather than an external 5V source, will keep the error flag voltage under 1.2V (typ.) in this condition.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com Stray capacitance to the LP2951-N 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 the Output pin and the Feedback pin,and increasing the output capacitor to at least 3.3 μF, will fix this problem.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 Typical Applications Figure 48. 1A Regulator with 1.2V Dropout Figure 49. 300mA Regulator with 0.75V Dropout *Minimum input-output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160mA. Figure 50.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com Figure 51. Low Drift Current Source *Minimum input-output voltage ranges from 40mV to 400mV, depending on load current. Current limit is typically 160mA. Figure 52.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 • Early warning flag on low input voltage • Main output latches off at lower input voltages • 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.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com For 5Vout, use internal resistors. Wire pin 6 to 7, & wire pin 2 to +Vout Bus. Figure 55. 2 Ampere Low Dropout Regulator *High input lowers Vout to 2.5V Figure 56. 5V Regulator with 2.
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LP2950-N, LP2951-N www.ti.com SNVS764N – JANUARY 2000 – REVISED MAY 2013 Figure 57. Open Circuit Detector for 4 → 20mA Current Loop *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. Figure 58.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com For values shown, Regulator shuts down when Vin < 5.5V and turns on again at 6.0V. Current drain in disconnected mode is ≈ 150μA. *Sets disconnect Voltage **Sets disconnect Hysteresis Figure 59. Low Battery Disconnect LM34 for 125°F Shutdown LM35 for 125°C Shutdown Figure 60.
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LP2950-N, LP2951-N www.ti.
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LP2950-N, LP2951-N SNVS764N – JANUARY 2000 – REVISED MAY 2013 www.ti.com REVISION HISTORY Changes from Revision M (April 2013) to Revision N • 24 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 14-Jun-2014 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LP2950ACZ-3.0/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS & no Sb/Br) CU SN N / A for Pkg Type -40 to 125 2950A CZ3.0 LP2950ACZ-3.3/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS & no Sb/Br) CU SN N / A for Pkg Type -40 to 125 2950A CZ3.3 LP2950ACZ-5.
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PACKAGE OPTION ADDENDUM www.ti.com 14-Jun-2014 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) 2951CN LP2950CZ-3.0/LFT3 ACTIVE TO-92 LP 3 2000 Green (RoHS & no Sb/Br) SN | CU SN N / A for Pkg Type 2950 CZ3.0 LP2950CZ-3.0/NOPB ACTIVE TO-92 LP 3 1800 Green (RoHS & no Sb/Br) CU SN N / A for Pkg Type LP2950CZ-3.
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PACKAGE OPTION ADDENDUM www.ti.com 14-Jun-2014 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LP2951ACMM-3.3/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0CA LP2951ACMM/NOPB ACTIVE VSSOP DGK 8 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0DA LP2951ACMMX-3.
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PACKAGE OPTION ADDENDUM www.ti.com 14-Jun-2014 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LP2951CM-3.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 14-Jun-2014 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LP2951CSD-3.3/NOPB ACTIVE WSON NGT 8 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 51AC33B LP2951CSD/NOPB ACTIVE WSON NGT 8 1000 Green (RoHS & no Sb/Br) CU NIPDAU | CU SN Level-1-260C-UNLIM -40 to 125 2951ACB LP2951CSDX-3.
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PACKAGE OPTION ADDENDUM www.ti.com 14-Jun-2014 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Jun-2014 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LP2950CDTX-3.0/NOPB TO-252 NDP 3 2500 330.0 16.4 6.9 10.5 2.7 8.0 16.0 Q2 LP2950CDTX-3.3/NOPB TO-252 NDP 3 2500 330.0 16.4 6.9 10.5 2.7 8.0 16.0 Q2 LP2950CDTX-5.0 TO-252 NDP 3 2500 330.0 16.4 6.9 10.5 2.7 8.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Jun-2014 Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant LP2951ACMX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LP2951ACSD WSON NGT 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LP2951ACSD/NOPB WSON NGT 8 1000 180.0 12.4 4.3 4.3 1.1 8.0 12.0 Q1 LP2951ACSDX/NOPB WSON NGT 8 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Jun-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP2950CDTX-3.0/NOPB TO-252 NDP 3 2500 367.0 367.0 38.0 LP2950CDTX-3.3/NOPB TO-252 NDP 3 2500 367.0 367.0 38.0 LP2950CDTX-5.0 TO-252 NDP 3 2500 367.0 367.0 35.0 LP2950CDTX-5.0/NOPB TO-252 NDP 3 2500 367.0 367.0 38.0 LP2951ACMM VSSOP DGK 8 1000 210.0 185.0 35.0 LP2951ACMM-3.
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PACKAGE MATERIALS INFORMATION www.ti.com 18-Jun-2014 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP2951ACSDX/NOPB WSON NGT 8 4500 367.0 367.0 35.0 LP2951CMM VSSOP DGK 8 1000 210.0 185.0 35.0 LP2951CMM-3.0/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LP2951CMM-3.3/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LP2951CMM/NOPB VSSOP DGK 8 1000 210.0 185.0 35.0 LP2951CMMX VSSOP DGK 8 3500 367.0 367.0 35.0 LP2951CMMX-3.
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MECHANICAL DATA NDP0003B TD03B (Rev F) www.ti.
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MECHANICAL DATA NGT0008A SDC08A (Rev A) www.ti.
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