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The LM2940-N and LM2940C positive voltage regulators feature the ability to source 1 A of output current with a dropout voltage of typically 0.5 V and a maximum of 1 V over the entire temperature range. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3 V. The quiescent current with 1 A of output current and an input-output differential of 5 V is therefore only 30 mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN − VOUT ≤ 3 V).
Designed also for vehicular applications, the LM2940-N and LM2940C and all regulated circuitry are protected from reverse battery installations or 2-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. The LM2940-N and LM2940C cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
LM2940-N | SOT-223 (4) | 6.50 mm x 3.50 mm |
WSON (8) | 4.00 mm x 4.00 mm | |
TO-263 (3) | 10.18 mm x 8.41 mm | |
TO-220 (3) | 14.986 mm x 10.16 mm | |
LM2940C | TO-263 (3) | 10.18 mm x 8.41 mm |
TO-220 (3) | 14.986 mm x 10.16 mm |
Changes from I Revision (April 2013) to J Revision
Changes from H Revision (April 2013) to I Revision
PIN | I/O | DESCRIPTION | ||||
---|---|---|---|---|---|---|
NAME | NDE | KTT | DCY | NGN | ||
IN | 1 | 1 | 1 | 3 | I | Unregulated input voltage. |
GND | 2 | 2 | 2 | 2 | — | Ground |
OUT | 3 | 3 | 3 | 5, 6 | O | Regulated output voltage. This pin requires an output capacitor to maintain stability. See Detailed Design Procedure for output capacitor details. |
GND | 4 | 4 | 4 | 7 | — | Ground |
N/C | — | — | — | 1, 4, 8 | — | No connection |
MIN | MAX | UNIT | ||
---|---|---|---|---|
LM2940-N KTT, NDE, DCY ≤ 100 ms | 60 | V | ||
LM2940C KTT, NDE ≤ 1 ms | 45 | |||
Internal power dissipation(2) | Internally Limited | |||
Maximum junction temperature | 150 | °C | ||
Soldering temperature(3) | TO-220 (NDE), Wave (10 s) | 260 | ||
DDPAK/TO-263 (KTT) (30 s) | 235 | |||
SOT-223 (DCY) (30 s) | 260 | |||
WSON-8 (NGN) (30 s) | 235 | |||
Storage temperature, Tstg | −65 | 150 |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±2000 | V |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Input voltage | 6 | 26 | V | |
Temperature | LM2940-N NDE, LM2940-N KTT | −40 | 125 | °C |
LM2940C NDE, LM2940C KTT | 0 | 125 | ||
LM2940-N DCY | −40 | 85 | ||
LM2940-N NGN | −40 | 125 |
THERMAL METRIC(1) | LM2940-N, LM2940C | LM2940-N | UNIT | |||
---|---|---|---|---|---|---|
TO-220 (NDE) | DDPAK/TO-263 (KTT) | SOT-223 (DCY) | WSON (NGN) | |||
3 PINS | 3 PINS | 4 PINS | 8 PINS | |||
RθJA | Junction-to-ambient thermal resistance(2) | 23.3 | 40.9 | 59.3 | 40.5 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 16.1 | 43.5 | 38.9 | 26.2 | |
RθJB | Junction-to-board thermal resistance | 4.8 | 23.5 | 8.1 | 17.0 | |
ψJT | Junction-to-top characterization parameter | 2.7 | 10.3 | 1.7 | 0.2 | |
ψJB | Junction-to-board characterization parameter | 4.8 | 22.5 | 8.0 | 17.2 | |
RθJC(bot) | Junction-to-case (bottom) thermal resistance | 1.1 | 0.8 | n/a | 3.2 |
PARAMETER | TEST CONDITIONS | 5 V | 8 V | UNIT | |||||
---|---|---|---|---|---|---|---|---|---|
MIN | TYP | MAX | MIN | TYP | MAX | ||||
Input voltage | 5 mA ≤ IOUT ≤ 1 A | 6.25 | 26 | 9.4 | 26 | V | |||
Output voltage | 5 mA ≤ IOUT ≤ 1A | 4.75 | 5 | 5.25 | 7.6 | 8 | 8.4 | ||
5 mA ≤ IOUT ≤ 1A, TJ = 25°C | 4.85 | 5 | 5.15 | 7.76 | 8 | 8.24 | |||
Line regulation | VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA TJ = 25°C |
20 | 50 | 20 | 80 | mV | |||
Load regulation | 50 mA ≤ IOUT ≤ 1 A | LM2940-N | 35 | 80 | 55 | 130 | mV | ||
50 mA ≤ IOUT ≤ 1 A TJ = 25°C |
LM2940-N | 35 | 50 | 55 | 80 | ||||
LM2940C | 35 | 50 | 55 | 80 | |||||
Output impedance | 100 mADC, 20 mArms, ƒOUT = 120 Hz | 35 | 55 | mΩ | |||||
Quiescent current | VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA |
LM2940-N | 10 | 20 | 10 | 20 | mA | ||
VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA TJ = 25°C |
LM2940-N | 10 | 15 | 10 | 15 | ||||
LM2940C | 10 | 15 | |||||||
VIN = VOUT + 5 V, IOUT = 1 A | 30 | 60 | 30 | 60 | |||||
VIN = VOUT + 5 V, IOUT = 1 A TJ = 25°C |
30 | 45 | 30 | 45 | |||||
Output noise voltage | 10 Hz to 100 kHz, IOUT = 5 mA | 150 | 240 | µVrms | |||||
Ripple rejection | ƒOUT = 120 Hz, 1 Vrms, IOUT = 100 mA | LM2940-N | 54 | 72 | 48 | 66 | dB | ||
ƒOUT = 120 Hz, 1 Vrms, IOUT = 100 mA TJ = 25°C |
LM2940-N | 60 | 72 | 54 | 66 | ||||
LM2940C | 60 | 72 | 54 | 66 | |||||
Long-term stability | 20 | 32 | mV/1000 Hr | ||||||
Dropout voltage | IOUT = 1A | 0.5 | 1 | 0.5 | 1 | V | |||
IOUT = 1A, TJ = 25°C | 0.5 | 0.8 | 0.5 | 0.8 | |||||
IOUT = 100 mA | 110 | 200 | 110 | 200 | mV | ||||
IOUT = 100 mA, TJ = 25°C | 110 | 150 | 110 | 150 | |||||
Short-circuit current | See(1), TJ = 25°C | 1.6 | 1.9 | 1.6 | 1.9 | A | |||
Maximum line transient | ROUT = 100Ω, T ≤ 100 ms | LM2940-N | 60 | 75 | 60 | 75 | V | ||
ROUT = 100Ω, T ≤ 1 ms TJ = 25°C |
LM2940C | 45 | 55 | 45 | 555 | ||||
Reverse polarity DC input voltage |
ROUT = 100 Ω | LM2940-N | –15 | –30 | –15 | –30 | V | ||
ROUT = 100 Ω TJ = 25°C |
LM2940C | –15 | –30 | –15 | –30 | ||||
Reverse polarity Transient Input Voltage |
ROUT = 100 Ω, T ≤ 100 ms | LM2940-N | –50 | –75 | –50 | –75 | V | ||
ROUT = 100 Ω, T ≤ 1 ms | LM2940C | –45 | –55 |
PARAMETER | TEST CONDITIONS | 9 V | 10 V | UNIT | |||||
---|---|---|---|---|---|---|---|---|---|
MIN | TYP | MAX | MIN | TYP | MAX | ||||
Input voltage | 5 mA ≤ IOUT ≤ 1 A | 10.5 | 26 | 11.5 | 26 | V | |||
Output voltage | 5 mA ≤ IOUT ≤ 1A | 8.55 | 9 | 9.45 | 9.5 | 10 | 10.5 | ||
5 mA ≤ IOUT ≤ 1A, TJ = 25°C | 8.73 | 9 | 9.27 | 9.7 | 10 | 10.3 | |||
Line regulation | VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA TJ = 25°C |
20 | 90 | 20 | 100 | mV | |||
Load regulation | 50 mA ≤ IOUT ≤ 1 A | LM2940-N | 60 | 150 | 65 | 165 | mV | ||
50 mA ≤ IOUT ≤ 1 A TJ = 25°C |
LM2940-N | 60 | 90 | 65 | 100 | ||||
LM2940C | 60 | 90 | |||||||
Output impedance | 100 mADC, 20 mArms, ƒOUT = 120 Hz | 60 | 65 | mΩ | |||||
Quiescent current | VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA |
LM2940-N | 10 | 20 | 10 | 20 | mA | ||
VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA TJ = 25°C |
LM2940-N | 10 | 15 | 15 | |||||
LM2940C | 10 | 15 | |||||||
VIN = VOUT + 5 V, IOUT = 1 A | 30 | 60 | 30 | 60 | |||||
VIN = VOUT + 5 V, IOUT = 1 A TJ = 25°C |
30 | 45 | 30 | 45 | |||||
Output noise voltage | 10 Hz to 100 kHz, IOUT = 5 mA | 270 | 300 | µVrms | |||||
Ripple rejection | ƒOUT = 120 Hz, 1 Vrms
IOUT = 100 mA |
LM2940-N | 46 | 64 | 45 | 63 | dB | ||
ƒOUT = 120 Hz, 1 Vrms
IOUT = 100 mA TJ = 25°C |
LM2940-N | 52 | 64 | 51 | 63 | ||||
LM2940C | 52 | 64 | |||||||
Long-term stability | 34 | 36 | mV/1000 Hr | ||||||
Dropout voltage | IOUT = 1A | 0.5 | 1 | 0.5 | 1 | V | |||
IOUT = 1A, TJ = 25°C | 0.5 | 0.8 | 0.5 | 0.8 | |||||
IOUT = 100 mA | 110 | 200 | 110 | 200 | mV | ||||
IOUT = 100 mA, TJ = 25°C | 110 | 150 | 110 | 150 | |||||
Short-circuit current | See(1), TJ = 25°C | 1.6 | 1.9 | 1.6 | 1.9 | A | |||
Maximum line transient | ROUT = 100Ω, T ≤ 100 ms | LM2940-N | 60 | 75 | 60 | 75 | V | ||
ROUT = 100Ω, T ≤ 100 ms TJ = 25°C |
LM2940C | 45 | 55 | ||||||
Reverse polarity DC input voltage |
ROUT = 100 Ω | LM2940-N | –15 | –30 | –15 | –30 | V | ||
ROUT = 100 Ω TJ = 25°C |
LM2940C | –15 | –30 | ||||||
Reverse polarity Transient Input Voltage |
ROUT = 100 Ω, T ≤ 100 ms | LM2940-N | –50 | –75 | –50 | –75 | V | ||
LM2940C | –45 | –55 |
PARAMETER | TEST CONDITIONS | 12 V | 15 V | UNIT | |||||
---|---|---|---|---|---|---|---|---|---|
MIN | TYP | MAX | MIN | TYP | MAX | ||||
Input voltage | 5 mA ≤ IOUT ≤ 1 A | 13.6 | 26 | 16.75 | 26 | V | |||
Output voltage | 5 mA ≤ IOUT ≤ 1A | 11.40 | 12 | 12.6 | 14.25 | 15 | 15.75 | ||
5 mA ≤ IOUT ≤ 1A, TJ = 25°C | 11.64 | 12 | 12.36 | 14.55 | 15 | 15.45 | |||
Line regulation | VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA TJ = 25°C |
20 | 120 | 20 | 150 | mV | |||
Load regulation | 50 mA ≤ IOUT ≤ 1 A | LM2940-N | 55 | 200 | mV | ||||
50 mA ≤ IOUT ≤ 1 A TJ = 25°C |
LM2940-N | 55 | 120 | ||||||
LM2940C | 55 | 120 | 70 | 150 | |||||
Output impedance | 100 mADC, 20 mArms, ƒOUT = 120 Hz | 80 | 100 | mΩ | |||||
Quiescent current | VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA |
LM2940-N | 10 | 20 | mA | ||||
VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA TJ = 25°C |
LM2940-N | 10 | 15 | ||||||
LM2940C | 10 | 15 | 10 | 15 | |||||
VIN = VOUT + 5 V, IOUT = 1 A | 30 | 60 | 30 | 60 | |||||
VIN = VOUT + 5 V, IOUT = 1 A TJ = 25°C |
30 | 45 | 30 | 45 | |||||
Output noise voltage | 10 Hz to 100 kHz, IOUT = 5 mA | 360 | 450 | µVrms | |||||
Ripple rejection | ƒOUT = 120 Hz, 1 Vrms, IOUT = 100 mA | LM2940-N | 48 | 66 | dB | ||||
ƒOUT = 120 Hz, 1 Vrms, IOUT = 100 mA TJ = 25°C |
LM2940-N | 54 | 66 | ||||||
LM2940C | 54 | 66 | 52 | 64 | |||||
Long-term stability | 48 | 60 | mV/1000 Hr | ||||||
Dropout voltage | IOUT = 1A | 0.5 | 1 | 0.5 | 1 | V | |||
IOUT = 1A, TJ = 25°C | 0.5 | 0.8 | 0.5 | 0.8 | |||||
IOUT = 100 mA | 110 | 200 | 110 | 200 | mV | ||||
IOUT = 100 mA, TJ = 25°C | 110 | 150 | 110 | 150 | |||||
Short-circuit current | See(1), TJ = 25°C | 1.6 | 1.9 | 1.6 | 1.9 | A | |||
Maximum line transient | ROUT = 100Ω, T ≤ 100 ms | LM2940-N | 60 | 75 | V | ||||
ROUT = 100Ω, T ≤ 100 ms TJ = 25°C |
LM2940C | 45 | 55 | 45 | 55 | ||||
Reverse polarity DC input voltage |
ROUT = 100 Ω | LM2940-N | –15 | –30 | V | ||||
ROUT = 100 Ω TJ = 25°C |
LM2940C | –15 | –30 | –15 | –30 | ||||
Reverse polarity transient input voltage |
ROUT = 100 Ω, T ≤ 100 ms | LM2940-N | –50 | –75 | V | ||||
ROUT = 100 Ω, T ≤ 1 ms | LM2940C | –45 | –55 | –45 | –55 |