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LP2981-N

www.ti.com

SNOS773K –MARCH 2000–REVISED APRIL 2013

LP2981-N Micropower 100 mA Ultra Low-Dropout Regulator in SOT-23 Package

Check for Samples: LP2981-N

FEATURES

DESCRIPTION

The LP2981-N is a 100 mA, fixed-output voltage

• Ultra Low Dropout Voltage

regulator designed specifically to meet the

• Output Voltage Accuracy 0.75% (A Grade)

requirements of battery-powered applications.

• Specified 100 mA Output Current

Using an optimized VIP (Vertically Integrated PNP)

• < 1 μA Quiescent Current when Shutdown

process, the LP2981-N delivers unequaled

• Low Ground Pin Current at All Load Currents

performance in all specifications critical to battery-

powered designs:

• High Peak Current Capability (300 mA Typical)

Dropout Voltage. Typically 200 mV @ 100 mA load,

• Wide Supply Voltage Range (16V Max)

and 7 mV @ 1 mA load.

• Fast Dynamic Response to Line and Load

Ground Pin Current. Typically 600 μA @ 100 mA

• Low Z

OUT

Over Wide Frequency Range

load, and 80 μA @ 1 mA load.

• Overtemperature/Overcurrent Protection

Sleep Mode. Less than 1 μA quiescent current when

• −40°C to +125°C Junction Temperature Range

ON/OFF pin is pulled low.

APPLICATIONS

Precision Output. 0.75% tolerance output voltages

available (A grade).

• Cellular Phone

Nine voltage options, from 2.5V to 5.0V, are available

• Palmtop/Laptop Computer

as standard products.

• Personal Digital Assistant (PDA)

• Camcorder, Personal Stereo, Camera

Block Diagram

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 (24 pages)

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LP2981-N www.ti.com SNOS773K – MARCH 2000 – REVISED APRIL 2013 LP2981-N Micropower 100 mA Ultra Low-Dropout Regulator in SOT-23 Package Check for Samples: LP2981-N FEATURES DESCRIPTION • • • • • • • • • • • The LP2981-N is a 100 mA, fixed-output voltage regulator designed specifically to meet the requirements of battery-powered applications. 1 2 Ultra Low Dropout Voltage Output Voltage Accuracy 0.
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LP2981-N SNOS773K – MARCH 2000 – REVISED APRIL 2013 www.ti.com Connection Diagram Figure 1. 5-Lead Small Outline Package (SOT-23) Top View See Package Number DBV0005A PIN DESCRIPTIONS Name Pin Number Function VIN 1 Input Voltage GND 2 Common Ground (device substrate) ON/OFF 3 Logic high enable input N/C 4 Post package trim - do not connect to this pin VOUT 5 Regulated output voltage These devices have limited built-in ESD protection.
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LP2981-N www.ti.com SNOS773K – MARCH 2000 – REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS Limits in standard typeface are for TJ = 25°C, and limits in boldface type applyover the full operating temperature range. Unless otherwise specified: VIN = VO(NOM) + 1V, CIN = 1 μF, IL = 1 mA, COUT = 4.7 μF,VON/OFF = 2V. Symbol ΔVO VIN–VO Parameter Output Voltage Tolerance Conditions Min Max IL = 1mA −0.75 0.75 −1.25 1.25 1 mA < IL < 100 mA −1.0 1.0 −2.0 2.0 −2.5 2.5 −3.5 3.
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LP2981-N SNOS773K – MARCH 2000 – REVISED APRIL 2013 www.ti.com TYPICAL APPLICATION CIRCUIT *ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used. **Minimum Output Capacitance is shown to insure stability over full load current range. More capacitance provides superior dynamic performance and additional stability margin (see APPLICATION HINTS). ***Do not make connections to this pin.
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LP2981-N www.ti.com SNOS773K – MARCH 2000 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified: TA = 25°C, VIN = VO(NOM) + 1V, COUT = 4.7 μF, CIN = 1 μF all voltage options, ON/OFF pin tied to VIN. Output Voltage vs Temperature Output Voltage vs Temperature Figure 2. Figure 3. Output Voltage vs Temperature Dropout Characteristics Figure 4. Figure 5. Dropout Characteristics Dropout Characteristics Figure 6. Figure 7.
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LP2981-N SNOS773K – MARCH 2000 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: TA = 25°C, VIN = VO(NOM) + 1V, COUT = 4.7 μF, CIN = 1 μF all voltage options, ON/OFF pin tied to VIN. 6 Dropout Voltage vs Temperature Dropout Voltage vs Load Current Figure 8. Figure 9. Ground Pin Current vs Temperature Ground Pin Current vs Load Current Figure 10. Figure 11. Input Current vs VIN Input Current vs VIN Figure 12. Figure 13.
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LP2981-N www.ti.com SNOS773K – MARCH 2000 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: TA = 25°C, VIN = VO(NOM) + 1V, COUT = 4.7 μF, CIN = 1 μF all voltage options, ON/OFF pin tied to VIN. Line Transient Response Line Transient Response Figure 14. Figure 15. Load Transient Response Load Transient Response Figure 16. Figure 17. Load Transient Response Load Transient Response Figure 18. Figure 19.
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LP2981-N SNOS773K – MARCH 2000 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: TA = 25°C, VIN = VO(NOM) + 1V, COUT = 4.7 μF, CIN = 1 μF all voltage options, ON/OFF pin tied to VIN. 8 Short Circuit Current Instantaneous Short Circuit Current vs Temperature Figure 20. Figure 21. Short Circuit Current Instantaneous Short Circuit Current vs Output Voltage Figure 22. Figure 23. Output Impedance vs Frequency Ripple Rejection Figure 24.
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LP2981-N www.ti.com SNOS773K – MARCH 2000 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: TA = 25°C, VIN = VO(NOM) + 1V, COUT = 4.7 μF, CIN = 1 μF all voltage options, ON/OFF pin tied to VIN. Output Noise Density Output Impedance vs Frequency Figure 26. Figure 27. Input to Output Leakage vs Temperature Output Reverse Leakage vs Temperature Figure 28. Figure 29. Turn-On Waveform Turn-Off Waveform Figure 30. Figure 31.
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LP2981-N SNOS773K – MARCH 2000 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: TA = 25°C, VIN = VO(NOM) + 1V, COUT = 4.7 μF, CIN = 1 μF all voltage options, ON/OFF pin tied to VIN. 10 ON/OFF Pin Current vs VON/OFF ON/OFF Threshold vs Temperature Figure 32. Figure 33.
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LP2981-N www.ti.com SNOS773K – MARCH 2000 – REVISED APRIL 2013 APPLICATION HINTS EXTERNAL CAPACITORS Like any low-dropout regulator, the external capacitors used with the LP2981-N must be carefully selected to assure regulator loop stability. Input Capacitor: An input capacitor whose value is ≥ 1 μF is required with the LP2981-N (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than 0.
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LP2981-N SNOS773K – MARCH 2000 – REVISED APRIL 2013 www.ti.com Figure 34. 5V/3.3 μF ESR Curves Figure 35. 5V/10 μF ESR Curves Figure 36. 3V/3.
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LP2981-N www.ti.com SNOS773K – MARCH 2000 – REVISED APRIL 2013 Figure 37. 3V/10 μF ESR Curves REVERSE CURRENT PATH The internal PNP power transistor used as the pass element in the LP2981-N has an inherent diode connected between the regulator output and input. During normal operation (where the input voltage is higher than the output) this diode is reverse biased (See Figure 38). LP2981-N VIN VOUT PNP GND Figure 38.
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LP2981-N SNOS773K – MARCH 2000 – REVISED APRIL 2013 www.ti.com ON/OFF INPUT OPERATION The LP2981-N is shut off by pulling the ON/OFF input low, and turned on by driving the input high. If this feature is not to be used, the ON/OFF input should be tied to VIN to keep the regulator on at all times (the ON/OFF input must not be left floating).
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LP2981-N www.ti.com SNOS773K – MARCH 2000 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision J (April 2013) to Revision K • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 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) LP2981AIM5-2.5 NRND SOT-23 DBV 5 1000 TBD Call TI Call TI -40 to 125 L0CA LP2981AIM5-2.5/NOPB ACTIVE SOT-23 DBV 5 1000 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0CA LP2981AIM5-3.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) LP2981IM5-3.6/NOPB Package Type Package Pins Package Drawing Qty ACTIVE SOT-23 DBV 5 1000 Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 L0JB (4/5) LP2981IM5-5.0 NRND SOT-23 DBV 5 1000 TBD Call TI Call TI -40 to 125 L03B LP2981IM5-5.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-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) LP2981AIM5-2.5 SOT-23 DBV 5 1000 178.0 8.4 LP2981AIM5-2.5/NOPB SOT-23 DBV 5 1000 178.0 LP2981AIM5-3.0/NOPB SOT-23 DBV 5 1000 178.0 LP2981AIM5-3.3 SOT-23 DBV 5 1000 LP2981AIM5-3.3/NOPB SOT-23 DBV 5 W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 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 LP2981IM5-3.3 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LP2981IM5-3.6/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LP2981IM5-5.0 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LP2981IM5-5.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP2981AIM5-5.0 SOT-23 DBV 5 1000 210.0 185.0 35.0 LP2981AIM5-5.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LP2981AIM5X-3.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LP2981AIM5X-3.3 SOT-23 DBV 5 3000 210.0 185.0 35.0 LP2981AIM5X-3.3/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LP2981AIM5X-3.6/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.
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