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LP2954, LP2954A

www.ti.com

SNVS096D –JUNE 1999–REVISED MARCH 2013

LP2954/LP2954A 5V and Adjustable Micropower Low-Dropout Voltage Regulators

Check for Samples: LP2954, LP2954A

FEATURES

DESCRIPTION

The LP2954 is a 5V micropower voltage regulator

• 5V Output within 1.2% Over Temperature

with very low quiescent current (90 μA typical at 1 mA

(A Grade)

load) and very low dropout voltage (typically 60 mV at

• Adjustable 1.23 to 29V Output Voltage

light loads and 470 mV at 250 mA load current).

Available (LP2954IM and LP2954AIM)

The quiescent current increases only slightly at

• Ensured 250 mA Output Current

dropout (120 μA typical), which prolongs battery life.

• Extremely Low Quiescent Current

The LP2954 with a fixed 5V output is available in the

• Low Dropout Voltage

three-lead TO-220 and DDPAK/TO-263 packages.

• Reverse Battery Protection

The adjustable LP2954 is provided in an 8-lead

surface mount, small outline package. The adjustable

• Extremely Tight Line and Load Regulation

version also provides a resistor network which can be

• Very Low Temperature Coefficient

pin strapped to set the output to 5V.

• Current and Thermal Limiting

Reverse battery protection is provided.

• Pin Compatible with LM2940 and LM340

The tight line and load regulation (0.04% typical), as

(5V Version Only)

well as very low output temperature coefficient make

• Adjustable Version Adds Error Flag to Warn of

the LP2954 well suited for use as a low-power

Output Drop and a Logic-Controlled Shutdown

voltage reference.

Output accuracy is ensured at both room temperature

APPLICATIONS

and over the entire operating temperature range.

• High-Efficiency Linear Regulator

• Low Dropout Battery-Powered Regulator

Package Outline and Ordering Information

Figure 1. TO-220 3–Lead Plastic Package (Front Figure 2. SO-8 Small Outline Surface Mount (Top

View) View)

Figure 3. TO-263 3-Lead Plastic Surface-Mount Figure 4. TO-263 3-Lead Plastic Surface-Mount

Package (Top View) Package (Side View)

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.

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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LP2954, LP2954A www.ti.com SNVS096D – JUNE 1999 – REVISED MARCH 2013 LP2954/LP2954A 5V and Adjustable Micropower Low-Dropout Voltage Regulators Check for Samples: LP2954, LP2954A FEATURES DESCRIPTION • The LP2954 is a 5V micropower voltage regulator with very low quiescent current (90 μA typical at 1 mA load) and very low dropout voltage (typically 60 mV at light loads and 470 mV at 250 mA load current). 1 2 • • • • • • • • • • 5V Output within 1.2% Over Temperature (A Grade) Adjustable 1.
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LP2954, LP2954A SNVS096D – JUNE 1999 – REVISED MARCH 2013 www.ti.com Absolute Maximum Ratings (1) (2) Operating Junction Temperature Range LP2954AI/LP2954I −40°C to +125°C −65°C to +150°C Storage Temperature Range Lead Temperature (Soldering, 5 seconds) 260°C Power Dissipation (3) Internally Limited Input Supply Voltage −20V to +30V ESD Rating (4) (1) (2) (3) (4) 2 2 kV Absolute maximum ratings indicate limits beyond which damage to the component may occur.
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LP2954, LP2954A www.ti.com SNVS096D – JUNE 1999 – REVISED MARCH 2013 Electrical Characteristics Limits in standard typeface are for TJ = 25°C, bold typeface applies over the −40°C to +125°C temperature range. Limits are specified by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise noted: VIN = 6V, IL = 1 mA, CL = 2.2 μF. Symbol Parameter Conditions VO 5.0 Output Voltage (1) Output Voltage Temp.
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LP2954, LP2954A SNVS096D – JUNE 1999 – REVISED MARCH 2013 www.ti.com Electrical Characteristics (continued) Limits in standard typeface are for TJ = 25°C, bold typeface applies over the −40°C to +125°C temperature range. Limits are specified by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise noted: VIN = 6V, IL = 1 mA, CL = 2.2 μF. Symbol Parameter Conditions Typical 2954AI Min 2954I Max Min Max 1.245 1.255 1.205 1.190 1.
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LP2954, LP2954A www.ti.com SNVS096D – JUNE 1999 – REVISED MARCH 2013 Table 1. Typical Values of Case-to-Heatsink Thermal Resistance (°C/W) (Data from AAVID Eng.) Silicone grease 1.0 Dry interface 1.3 Mica with grease 1.4 Table 2. Typical Values of Case-to-Heatsink Thermal Resistance (°C/W) (Data from Thermalloy) Thermasil III 1.3 Thermasil II 1.5 Thermalfilm (0.002) with grease 2.
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LP2954, LP2954A SNVS096D – JUNE 1999 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics 6 Quiescent Current Quiescent Current Figure 5. Figure 6. Ground Pin Current vs Load Ground Pin Current Figure 7. Figure 8. Ground Pin Current Output Noise Voltage Figure 9. Figure 10.
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LP2954, LP2954A www.ti.com SNVS096D – JUNE 1999 – REVISED MARCH 2013 Typical Performance Characteristics (continued) Ripple Rejection Ripple Rejection Figure 11. Figure 12. Ripple Rejection Line Transient Response Figure 13. Figure 14. Line Transient Response Output Impedance Figure 15. Figure 16.
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LP2954, LP2954A SNVS096D – JUNE 1999 – REVISED MARCH 2013 www.ti.com Typical Performance Characteristics (continued) 8 Load Transient Response Load Transient Response Figure 17. Figure 18. Dropout Characteristics Thermal Response Figure 19. Figure 20.
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LP2954, LP2954A www.ti.com SNVS096D – JUNE 1999 – REVISED MARCH 2013 Typical Performance Characteristics (continued) (1) Short-Circuit Output Current and Maximum Output Current Maximum Power Dissipation (DDPAK/TO-263) (1) Figure 21. Figure 22. The maximum allowable power dissipation is a function of the maximum junction temperature, TJ (MAX), the junction-to-ambient thermal resistance, θJ-A, and the ambient temperature, TA.
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LP2954, LP2954A SNVS096D – JUNE 1999 – REVISED MARCH 2013 www.ti.com APPLICATION HINTS EXTERNAL CAPACITORS A 2.2 μF (or greater) capacitor is required between the output pin and the ground to assure stability (refer to Figure 23). Without this capacitor, the part may oscillate. Most types of tantalum or aluminum electrolytics will work here. Film types will work, but are more expensive.
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LP2954, LP2954A www.ti.com SNVS096D – JUNE 1999 – REVISED MARCH 2013 *See EXTERNAL CAPACITORS PTotal = (VIN −5) IL+ (VIN) IG Figure 23. Basic 5V Regulator Circuit The next parameter which must be calculated is the maximum allowable temperature rise, TR(max).
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LP2954, LP2954A SNVS096D – JUNE 1999 – REVISED MARCH 2013 www.ti.com where VREF is the 1.23V reference and IFB is the Feedback pin bias current (−20 nA typical). The minimum recommended load current of 1 μA sets an upper limit of 1.2 MΩ on the value of R2 in cases where the regulator must work with no load (see MINIMUM LOAD). IFB will produce a typical 2% error in VOUT which can be eliminated at room temperature by trimming R1. For better accuracy, choosing R2 = 100 kΩ will reduce this error to 0.
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LP2954, LP2954A www.ti.com SNVS096D – JUNE 1999 – REVISED MARCH 2013 * In shutdown mode, ERROR will go high if it has been pulled up to an external supply. To avoid this invalid response, pull up to regulator output. ** Exact value depends on dropout voltage. (See Application Hints) Figure 25.
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LP2954, LP2954A SNVS096D – JUNE 1999 – REVISED MARCH 2013 www.ti.com Typical Applications Figure 26. Typical Application Circuit Figure 27. 5V Regulator *Output voltage equals +VIN minus dropout voltage, which varies with output current. Current limits at 380 mA (typical). Figure 28.
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LP2954, LP2954A www.ti.
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LP2954, LP2954A SNVS096D – JUNE 1999 – REVISED MARCH 2013 www.ti.com REVISION HISTORY Changes from Revision C (March 2013) to Revision D • 16 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 PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details.
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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) W Pin1 (mm) Quadrant LP2954AIMX/NOPB SOIC D 8 2500 330.0 12.4 6.5 5.4 2.0 8.0 12.0 Q1 LP2954AISX DDPAK/ TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LP2954AISX/NOPB DDPAK/ TO-263 KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LP2954AIMX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LP2954AISX DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LP2954AISX/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LP2954IMX/NOPB SOIC D 8 2500 367.0 367.0 35.0 LP2954ISX DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LP2954ISX/NOPB DDPAK/TO-263 KTT 3 500 367.
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MECHANICAL DATA NDE0003B www.ti.
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MECHANICAL DATA KTT0003B TS3B (Rev F) BOTTOM SIDE OF PACKAGE www.ti.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.