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Part: 5962-9166701VEA
Category:
Power Management
-> Regulators
-> Linear Voltage Regulators
-> LDO (Low Drop Out)
-> Positive Voltage->Adjustable
Description: LM2941 - 1A Low Dropout Adjustable Regulator, Package: Cerdip, Pin Nb=16
Company: National Semiconductor Corporation
Datasheet: Download 5962-9166701VEA datasheet File size : 456 kB
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Datasheet text preview:
LM2941/LM2941C 1A Low Dropout Adjustable Regulator
August 2002
LM2941/LM2941C 1A Low Dropout Adjustable Regulator
General 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. Furthermore, a quiescent current reduction circuit has been included which reduces the ground pin current when the differential between the input voltage and the output voltage exceeds approximately 3V. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN - VOUT 3V). 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.
Features
n n n n n n n n n n LLP space saving package Output voltage adjustable from 5V to 20V Dropout voltage typically 0.5V @ IO = 1A Output current in excess of 1A Trimmed reference voltage Reverse battery protection Internal short circuit current limit Mirror image insertion protection P+ Product Enhancement tested TTL, CMOS compatible ON/OFF switch
Connection Diagram and Ordering Information
TO-220 Plastic Package TO-263 Surface-Mount Package
00882309 00882302
Tep View Order Number LM2941T or LM2941CT See NS Package Number TO5A 16-Lead Ceramic Dual-in-Line Package
00882308
Order Number LM2941S, LM2941SX or LM2941CS, LM2941CSX See NS Package Number TS5B 16-Lead Ceramic Surface Mount Package 8-Lead LLP Surface Mount Package
00882331
00882332
Top View Order Number LM2941J/883 LM2941J-QMLV, 5962-9166701QEA See NS Package Number J16A
Top View Order Number LM2941WG/883 LM2941WG-QMLV, 5962-9166701QYA See NS Package Number WG16A
00882333
Top View Ordering Number LM2941LD, LM2941LDX See NS Package Number LDC08A
© 2002 National Semiconductor Corporation
DS008823
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LM2941/LM2941C
Absolute Maximum Ratings
(Note 1)
TO-263 (S) Package ESD susceptibility to be determined.
260°C
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage (Survival Voltage, 100ms) LM2941T, LM2941S, LM2941LD LM2941CT, LM2941CS Internal Power Dissipation (Note 3) Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 seconds) TO-220 (T) Package 260°C 60V 45V Internally Limited 150°C -65°C TJ +150°C
Operating Ratings
Maximum Input Voltage Temperature Range LM2941T LM2941CT LM2941S LM2941CS LM2941J LM2941WG LM2941LD -40°C TJ 125°C 0°C TJ 125°C -40°C TJ 125°C 0°C TJ 125°C -55°C TJ 125°C -55°C TJ 125°C -40°C TJ 125°C 26V
Electrical Characteristics -- LM2941T, LM2941S, LM2941J, LM2941WG, LM2941LD
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. LM2941J LM2941WG Limit (Note 2) (Note 4) 1.237/1.211 1.313/1.339 Line Regulation Load Regulation Output Impedance Quiescent Current RMS Output Noise, % of VOUT Ripple Rejection Long Term Stability Dropout Voltage Short Circuit Current Maximum Line Transient Maximum Operational Input Voltage Reverse Polarity DC Input Voltage Reverse Polarity Transient Input Voltage ON/OFF Threshold Voltage ON ON/OFF Threshold Voltage OFF ON/OFF Threshold Current RO = 100, VO -0.6V T 100ms, RO = 100 IO 1A IO 1A VON/OFF = 2.0V, IO 1A IO = 1A IO = 100mA VIN Max = 26V (Note 7) VO Max 1V Above Nominal VO RO = 100, T 100ms 31 -30 -75 1.30 1.30 26/26 -15/-15 -50/-50 0.80/0.80 2.00/2.00 26/26 -15/-15 -50/-50 0.80/0.80 2.00/2.00 VDC V(min) V(min) V(max) V(min) VO + 2V VIN 26V, IO = 5mA 50mA IO 1A 100 mADC and 20 mArms fO = 120Hz VO + 2V VIN < 26V, IO = 5mA VIN = VO + 5V, IO = 1A 10Hz 100kHz IO = 5mA fO = 120Hz, 1 Vrms, IL = 100mA 0.005 0.4 0.5 110 1.9 75 0.8/1.0 200/200 1.6/1.3 60/60 0.8/1.0 200/200 1.6 60/60 0.02/0.04 0.02/0.04 %/V(max) %/1000 Hr V(max) mV(max) A(min) V(min) 10 30 0.003 15/20 45/60 15/20 45/60 mA(max) mA(max) % 4 7 7 10/10 10/10 LM2941T LM2941S LM2941LD Limit (Note 5) 1.237/1.211 1.313/1.339 10/10 10/10
Parameter
Conditions
Typ
Units (Limits)
Reference Voltage
5mA IO 1A (Note 6)
1.275
V(min) V(max) mV/V(max) mV/V(max) m/V
50
100/300
100/300
µA(max)
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LM2941/LM2941C
Electrical Characteristics -- LM2941CT, LM2941CS
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 Reference Voltage Line Regulation Load Regulation Output Impedance Quiescent Current RMS Output Noise, % of VOUT Ripple Rejection Long Term Stability Dropout Voltage Short Circuit Current Maximum Line Transient Maximum Operational Input Voltage Reverse Polarity DC Input Voltage Reverse Polarity Transient Input Voltage ON/OFF Threshold Voltage ON ON/OFF Threshold Voltage OFF ON/OFF Threshold Current RO = 100, VO -0.6V T 100ms, RO = 100 IO 1A IO 1A VON/OFF = 2.0V, IO 1A IO = 1A IO = 100mA VIN Max = 26V (Note 7) VO Max 1V Above Nominal VO RO = 100, T 100ms 31 -30 -55 1.30 1.30 50 26 -15 -45 0.80 2.00 100 VDC V(min) V(min) V(max) V(min) µA(max) Conditions 5mA IO 1A (Note 6) VO + 2V VIN 26V, IO = 5mA 50mA IO 1A 100 mADC and 20 mArms fO = 120Hz VO + 2V VIN < 26V, IO = 5mA VIN = VO + 5V, IO = 1A 10Hz 100kHz IO = 5mA fO = 120Hz, 1 Vrms, IL = 100mA 0.005 0.4 0.5 110 1.9 55 0.8/1.0 200/200 1.6 45 0.02 %/V(max) %/1000 Hr V(max) mV(max) A(min) V(min) 10 30 0.003 15 45/60 mA(max) mA(max) % Typ 1.275 4 7 7 Limit (Note 5) 1.237/1.211 1.313/1.339 10 10 Units (Limits) V(min) V(max) mV/V(max) mV/V(max) m/V
Thermal Performance
Thermal Resistance Junction-to-Case Thermal Resistance Junction-to-Ambient 5-Lead TO-220 5-Lead TO-263 5-Lead TO-220 5-Lead TO-263 8-Lead LLP (Note 3) 3 3 53 73 35 °C/W °C/W °C/W °C/W °C/W
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is intended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: A military RETS specification available upon request. For more information about military-aerospace products, see the Mil-Aero web page at http://www.national.com/appinfo/milaero/index.html. Note 3: The maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max) - TA)/JA. If this dissipation is exceeded, the die temperature will rise above 150°C and the LM2941 will go into thermal shutdown. If the TO-263 package is used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package: Using 0.5 square inches of copper area, JA is 50°C/W; with 1 square inch of copper area, JA is 37°C/W; and with 1.6 or more square inches of copper area, JA is 32°C/W. Thermal performance for the LLP package was obtained using a JESD51-7 board with six vias, using no airflow and an ambient temperature of 22°C. The value JA for the LLP package is specifically dependent on PCB trace area, trace material, and the number of layers and thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187. It is recommended that 6 vias be placed under the center pad to improve thermal performance. Note 4: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type). All limits are used to calculate Outgoing Quality Level, and are 100% production tested. Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type). All room temperature limits are 100% production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. Note 6: The output voltage range is 5V to 20V and is determined by the two external resistors, R1 and R2. See Typical Application Circuit.
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LM2941/LM2941C
Thermal Performance
(Continued)
Note 7: Output current capability will decrease with increasing temperature, but will not go below 1A at the maximum specified temperatures.
Typical Performance Characteristics
Dropout Voltage Dropout Voltage vs. Temperature
00882311
00882312
Output Voltage
Quiescent Current vs. Temperature
00882313
00882314
Quiescent Current
Quiescent Current
00882315
00882316
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LM2941/LM2941C
Typical Performance Characteristics
Line Transient Response
(Continued) Load Transient Response
00882317
00882318
Ripple Rejection
Output Impedance
00882319
00882320
Low Voltage Behavior
Low Voltage Behavior
00882321
00882322
5
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