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LM2941 Datenblatt(PDF) 5 Page - Texas Instruments

Teilenummer LM2941
Bauteilbeschribung  1A Low Dropout Adjustable Regulator
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LM2941 Datenblatt(HTML) 5 Page - Texas Instruments

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LM2941, LM2941C
www.ti.com
SNVS770I – JUNE 1999 – REVISED JANUARY 2015
6.4 Thermal Information
LM2941LD
LM2941S, LM2941T
WSON
TO-263
TO-220
THERMAL METRIC(1)(2)
UNIT
(NGN)
(KTT)
(KC)
8 PINS
5 PINS
5 PINS
RθJA
Junction-to-ambient thermal resistance
40.5
41
32.1
RθJC(top)
Junction-to-case (top) thermal resistance
26.2
43.2
25.6
RθJB
Junction-to-board thermal resistance
17
22.9
18.3
°C/W
ψJT
Junction-to-top characterization parameter
0.2
11.4
8.5
ψJB
Junction-to-board characterization parameter
17.2
21.9
17.7
RθJC(bot)
Junction-to-case (bottom) thermal resistance
3.2
0.9
0.7
(1)
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
(2)
The maximum power dissipation is a function of TJ(max), RθJA, and TA. The maximum allowable power dissipation at any ambient
temperature is PD = (TJ(max) − TA)/RθJA. 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 PC board copper
area thermally connected to the package. The value RθJA for the WSON 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 WSON package,
refer to Application Note AN-1187 (SNOA401). It is recommended that 6 vias be placed under the center pad to improve thermal
performance.
6.5 Electrical Characteristics: LM2941T, LM2941S, LM2941LD
5 V
≤ VOUT ≤ 20 V, VIN = VOUT + 5 V, COUT = 22 μF, unless otherwise specified. MIN (minimum) and MAX (maximum)
specifications in apply over the full Operating Temperature Range (unless otherwise specified) and typical values apply at TJ
= 25°C.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
5 mA
≤ IOUT ≤ 1 A
(1)
1.211
1.275
1.339
Reference voltage
V
5 mA
≤ IOUT ≤ 1 A
(1), T
J = 25°C
1.237
1.275
1.313
Line regulation
VOUT + 2 V ≤ VIN ≤ 26 V, IOUT = 5 mA
4
10
mV/V
Load regulation
50 mA
≤ IOUT ≤ 1 A
7
10
mV/V
Output impedance
100 mADC and 20 mArms, ƒOUT = 120 Hz
7
m
Ω/V
VOUT + 2 V ≤ VIN < 26 V, IOUT = 5 mA
10
20
mA
VOUT + 2 V ≤ VIN < 26 V, IOUT = 5 mA, TJ =
10
15
25°C
Quiescent current
VIN = VOUT + 5 V, IOUT = 1 A
30
60
mA
VIN = VOUT + 5 V, IOUT = 1 A, TJ = 25°C
30
45
RMS output noise, % of VOUT
10 Hz to 100 kHz, IOUT = 5 mA
0.003%
ƒOUT = 120 Hz, 1 Vrms, IL = 100 mA
0.005
0.04
Ripple rejection
%/V
ƒOUT = 120 Hz, 1 Vrms, IL = 100 mA, TJ = 25°C
0.005
0.02
Long-term stability
0.4
%/1000 Hr
IOUT = 1 A
0.5
1
V
Dropout voltage
IOUT = 1 A, TJ = 25°C
0.5
0.8
IOUT = 100 mA
110
200
mV
Short-circuit current
VIN max = 26 V
(2)
1.6
1.9
A
VOUT max 1 V above nominal VOUT
75
Maximum line transient
60
V
ROUT = 100 Ω, t ≤ 100 ms
Maximum operational input
26
31
VDC
voltage
Reverse polarity
ROUT = 100 Ω, VOUT ≥ −0.6 V
−15
−30
DC input voltage
V
Reverse polarity
t
≤ 100 ms, ROUT = 100 Ω
−50
−75
transient input voltage
(1)
The output voltage range is 5 V to 20 V and is determined by the two external resistors, R1 and R2. See Figure 18.
(2)
Output current capability will decrease with increasing temperature, but will not go below 1 A at the maximum specified temperatures.
Copyright © 1999–2015, Texas Instruments Incorporated
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