Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - LDO voltage regulator Positivbe, adjustable TO 263 5

ON/OFF

GND

INPUT

N/C

ADJ

GND

N/C

OUTPUT

GND*

* TIE TO GND OR LEAVE FLOATING

LM2941, LM2941C

www.ti.com

SNVS770G –JUNE 1999–REVISED APRIL 2013

LM2941/LM2941C 1A Low Dropout Adjustable Regulator

Check for Samples: LM2941, LM2941C

FEATURES

DESCRIPTION

The LM2941 positive voltage regulator features the

• WSON Space Saving Package

ability to source 1A of output current with a typical

• Output Voltage Adjustable From 5V to 20V

dropout voltage of 0.5V and a maximum of 1V over

• Dropout Voltage Typically 0.5V @ I

= 1A

the entire temperature range. Furthermore, a

quiescent current reduction circuit has been included

• Output Current in Excess of 1A

which reduces the ground pin current when the

• Trimmed Reference Voltage

differential between the input voltage and the output

• Reverse Battery Protection

voltage exceeds approximately 3V. The quiescent

current with 1A of output current and an input-output

• Internal Short Circuit Current Limit

differential of 5V is therefore only 30mA. Higher

• Mirror Image Insertion Protection

quiescent currents only exist when the regulator is in

• P

Product Enhancement Tested

the dropout mode (V

− V

OUT

≤ 3V).

• TTL, CMOS Compatible ON/OFF Switch

Designed also for vehicular applications, the LM2941

and all regulated circuitry are protected from reverse

battery installations or two-battery jumps. During line

transients, such as load dump when the input voltage

can momentarily exceed the specified maximum

operating voltage, the regulator will automatically shut

down to protect both the internal circuits and the load.

Familiar regulator features such as short circuit and

thermal overload protection are also provided.

Connection Diagrams

TO-220 Plastic Package

8-Lead WSON Surface Mount Package

Figure 1. Top View

See Package Number KC

TO-263 Surface-Mount Package

Figure 3. Top View

See Package Number NGN

Figure 2. See Package Number KTT

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 (26 pages)

PAGE 1
LM2941, LM2941C www.ti.com SNVS770G – JUNE 1999 – REVISED APRIL 2013 LM2941/LM2941C 1A Low Dropout Adjustable Regulator Check for Samples: LM2941, LM2941C FEATURES DESCRIPTION • • • • • • • • • • The LM2941 positive voltage regulator features the ability to source 1A of output current with a typical dropout voltage of 0.5V and a maximum of 1V over the entire temperature range.
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LM2941, LM2941C SNVS770G – JUNE 1999 – 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.
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LM2941, LM2941C www.ti.com SNVS770G – JUNE 1999 – REVISED APRIL 2013 Electrical Characteristics—LM2941T, LM2941S, LM2941LD (continued) 5V ≤ VO ≤ 20V, VIN = VO + 5V, CO = 22μF, unless otherwise specified. Specifications in standard typeface apply for TJ = 25°C, while those in boldface type apply over the full Operating Temperature Range. Parameter Conditions Typ RMS Output Noise, % of VOUT 10Hz–100kHz IO = 5mA 0.003 Ripple Rejection fO = 120Hz, 1 Vrms, IL = 100mA 0.
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LM2941, LM2941C SNVS770G – JUNE 1999 – REVISED APRIL 2013 www.ti.com Electrical Characteristics—LM2941CT, LM2941CS (continued) 5V ≤ VO ≤ 20V, VIN = VO + 5V, CO = 22μF, unless otherwise specified. Specifications in standard typeface apply for TJ = 25°C, while those in boldface type apply over the full Operating Temperature Range.
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LM2941, LM2941C www.ti.com SNVS770G – JUNE 1999 – REVISED APRIL 2013 Typical Performance Characteristics Dropout Voltage Dropout Voltage vs. Temperature Figure 4. Figure 5. Output Voltage Quiescent Current vs. Temperature Figure . Figure 6. Quiescent Current Quiescent Current Figure 7. Figure 8.
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LM2941, LM2941C SNVS770G – JUNE 1999 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 6 Line Transient Response Load Transient Response Figure 9. Figure 10. Ripple Rejection Output Impedance Figure 11. Figure 12. Low Voltage Behavior Low Voltage Behavior Figure 13. Figure 14.
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LM2941, LM2941C www.ti.com SNVS770G – JUNE 1999 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Output Capacitor ESR Output at Voltage Extremes Figure 15. Figure 16. Output at Voltage Extremes Peak Output Current Figure 17. Figure 18. Maximum Power Dissipation (TO-220) Maximum Power Dissipation (TO-263) Figure 19. Figure 20.
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LM2941, LM2941C SNVS770G – JUNE 1999 – REVISED APRIL 2013 www.ti.com Definition of Terms Dropout Voltage: The input-voltage differential at which the circuit ceases to regulate against further reduction in input voltage. Measured when the output voltage has dropped 100mV from the nominal value obtained at (VOUT + 5V) input, dropout voltage is dependent upon load current and junction temperature. Input Voltage: The DC voltage applied to the input terminals with respect to ground.
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LM2941, LM2941C www.ti.com SNVS770G – JUNE 1999 – REVISED APRIL 2013 ON/OFF The ON/OFF pin has no internal pull-up or pull-down to establish a default condition and, as a result, this pin must be terminated externally, either actively or passively. The ON/OFF pin requires a low level to enable the output, and a high level to disable the output. To ensure reliable operation, the ON/OFF pin voltage must rise above the maximum ON/OFF(OFF) voltage threshold (2.
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LM2941, LM2941C SNVS770G – JUNE 1999 – REVISED APRIL 2013 www.ti.com For the LM2941S in the KTT TO-263 package, the junction-to-case thermal rating, θJC, is 1°C/W, where the CASE is defined as the bottom of the package at the center of the TAB area.
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LM2941, LM2941C www.ti.com SNVS770G – JUNE 1999 – REVISED APRIL 2013 For the LM2941LD in the NGN 8-Lead WSON package, the junction-to-case thermal rating, θJC, is 5.3°C/W, where the CASE is defined as the bottom of the package at the center of the DAP area. The junction-to-ambient thermal performance for the LM2941LD in the NGN 8-Lead WSON package, using the JEDEC JESD51 standards is summarized in the following table: Board Type Thermal Vias θJC θJA JEDEC 2-Layer JESD 51-3 None 5.
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LM2941, LM2941C SNVS770G – JUNE 1999 – REVISED APRIL 2013 www.ti.com Typical Applications Note: Using 1k for R1 will ensure that the bias current error from the adjust pin will be negligible. Do not bypass R1 or R2. This will lead to instabilities. * Required if regulator is located far from power supply filter. ** COUT must be at least 22μF to maintain stability. May be increased without bound to maintain regulation during transients. Locate as close as possible to the regulator.
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LM2941, LM2941C www.ti.
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LM2941, LM2941C SNVS770G – JUNE 1999 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision F (April 2013) to Revision G • 14 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.
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PACKAGE OPTION ADDENDUM www.ti.com 12-Nov-2013 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 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 LM2941CSX DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2941CSX/NOPB DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 LM2941LD WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 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) LM2941CSX DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2941CSX/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2941LD WSON NGN 8 1000 210.0 185.0 35.0 LM2941LD/NOPB WSON NGN 8 1000 213.0 191.0 55.0 LM2941LDX WSON NGN 8 4500 367.0 367.0 35.0 LM2941LDX/NOPB WSON NGN 8 4500 367.0 367.0 35.
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MECHANICAL DATA NDH0005D www.ti.
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MECHANICAL DATA NGN0008A LDC08A (Rev B) www.ti.
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MECHANICAL DATA KTT0005B TS5B (Rev D) BOTTOM SIDE OF PACKAGE www.ti.
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MECHANICAL DATA NEB0005F www.ti.
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MECHANICAL DATA NEC0005D TA05D (Rev A) 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.