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LP4950C-5V, LP4951C

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SNVS208C –SEPTEMBER 2002–REVISED APRIL 2013

LP4950C-5V and LP4951C Adjustable Micropower Voltage Regulators

Check for Samples: LP4950C-5V, LP4951C

FEATURES

DESCRIPTION

The LP4950C and LP4951C are micropower voltage

• High Accuracy 5V Specified 100mA Output

regulators with very low quiescent current (75μA typ.)

• Extremely Low Quiescent Current

and very low dropout voltage (typ. 40mV at light loads

• Low Dropout Voltage

and 380mV at 100mA). They are ideally suited for

use in battery-powered systems. Furthermore, the

• Extremely Tight Load and Line Regulation

quiescent current of the LP4950C/LP4951C

• Very Low Temperature Coefficient

increases only slightly in dropout, prolonging battery

• Use as Regulator or Reference

life.

• Needs Only 1μF for Stability

The LP4950C in the popular 3-pin TO-92 package is

• Current and Thermal Limiting

pin compatible with older 5V regulators. The 8-lead

LP4951C is available in a plastic surface mount

package and offers additional system functions.

LP4951C VERSIONS ONLY

One such feature is an error flag output which warns

of a low output voltage, often due to falling batteries

• Error Flag Warns of Output Dropout

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

• Logic-controlled Electronic Shutdown

second feature is the logic-compatible shutdown input

• Output Pogrammable From 1.24 to 29V

which enables the regulator to be switched on and

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

output or programmed from 1.24V to 29V with an

external pair of resistors.

Careful design of the LP4950C/LP4951C 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

LP4950C LP4951C

Figure 1.

Figure 2.

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 (21 pages)

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LP4950C-5V, LP4951C www.ti.com SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 LP4950C-5V and LP4951C Adjustable Micropower Voltage Regulators Check for Samples: LP4950C-5V, LP4951C FEATURES DESCRIPTION • • • • • • • • The LP4950C and LP4951C are micropower voltage regulators with very low quiescent current (75μA typ.) and very low dropout voltage (typ. 40mV at light loads and 380mV at 100mA). They are ideally suited for use in battery-powered systems.
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LP4950C-5V, LP4951C SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 www.ti.com 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) Input Supply Voltage −0.3 to +30V SHUTDOWN Input Voltage, Error Comparator Output Voltage, (2) −0.3 to +30V FEEDBACK Input Voltage (2) (3) −1.
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LP4950C-5V, LP4951C www.ti.com SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS (1) LP4950CZ Parameter Output Voltage LP4951CM Conditions (1) TJ = 25°C Tested Design Typ Limit (2) Limit (3) 5.0 5.1 V max 4.9 −25°C ≤ TJ ≤ 85°C Output Voltage Output Voltage Temperature Coefficient Line Regulation (5) 100 μA ≤ IL ≤ 100 mA TJ ≤ TJMAX (4) 6V ≤ VIN ≤ 30V (6) V min 5.15 Full Operating Temperature Range 0.04 V min 5.2 V max 4.8 V min 5.24 V max 4.
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LP4950C-5V, LP4951C SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS LP4951C Parameter Conditions (1) Typ Tested Limit 1.235 1.285 (2) Design Limit (3) Units 8-PIN VERSIONS ONLY Reference Voltage V max 1.295 1.185 Reference Voltage (4) Feedback Pin Bias Current 20 V min 1.165 Vmin 1.335 V max 1.135 V min 40 nA max 60 Reference Voltage Temperature Coefficient (5) Feedback Pin Bias Current Temperature Coefficient V max nA max 50 ppm/°C 0.
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LP4950C-5V, LP4951C www.ti.com SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 CONNECTION DIAGRAMS TO-92 Plastic Package Surface-Mount Package (SOIC) Figure 3. Bottom View Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LP4950C-5V LP4951C Figure 4.
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LP4950C-5V, LP4951C SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS . 6 Quiescent Current Dropout Characteristics Figure 5. Figure 6. Input Current Input Current Figure 7. Figure 8. Output Voltage vs. Temperature of 3 Representative Units Quiescent Current Figure 9. Figure 10.
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LP4950C-5V, LP4951C www.ti.com SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) . Quiescent Current Quiescent Current Figure 11. Figure 12. Quiescent Current Short Circuit Current Figure 13. Figure 14. Dropout Voltage Dropout Voltage Figure 15. Figure 16.
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LP4950C-5V, LP4951C SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) . LP4951C Minimum Operating Voltage LP4951C Feedback Bias Current Figure 17. Figure 18. LP4951C Feedback Pin Current LP4951C Error Comparator Output 8 COMPARATOR OUTPUT (V) VOUT = 5V 6 4 HYSTERESIS 2 0 NOTE: PULLUP RESISTOR TO SEPARATE 5V SUPPLY -2 0 1 2 3 4 5 INPUT VOLTAGE (V) 8 Figure 19. Figure 20.
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LP4950C-5V, LP4951C www.ti.com SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) . Load Transient Response Load Transient Response Figure 23. Figure 24. LP4951C Enable Transient Output Impedance Figure 25. Figure 26. Ripple Rejection Ripple Rejection Figure 27. Figure 28.
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LP4950C-5V, LP4951C SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) . 10 Ripple Rejection Output Noise Figure 29. Figure 30. LP4951C Divider Resistance Shutdown Threshold Voltage Figure 31. Figure 32. Line Regulation LP4951C Maximum Rated Output Current Figure 33. Figure 34.
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LP4950C-5V, LP4951C www.ti.com SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) . Thermal Response Figure 35. APPLICATION HINTS EXTERNAL CAPACITORS A 1.0μF (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. Without this capacitor the part will oscillate.
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LP4950C-5V, LP4951C SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 www.ti.com 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 resistor, note that while the output is rated to sink 400μA, this sink current adds to battery drain in a low battery condition. Suggested values range from 100k to 1 MΩ.
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LP4950C-5V, LP4951C www.ti.com SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 *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 37. Adjustable Regulator (LP4951C) 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.
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LP4950C-5V, LP4951C SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 www.ti.
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LP4950C-5V, LP4951C www.ti.com SNVS208C – SEPTEMBER 2002 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision B (April 2013) to Revision C • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 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 LP4951CMX SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LP4951CMX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP4951CMX SOIC D 8 2500 367.0 367.0 35.0 LP4951CMX/NOPB SOIC D 8 2500 367.0 367.0 35.
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