LM2931, NCV2931 Series
Vn , OUTPUT NOISE VOLTAGE (mVrms)
100
V
in
= 5.6 V
V
out
= 5.0 V
I
O
= 100 mA
V
n
rms 10 Hz to 10 MHz
|Z
O
| @ 40 kHz
T
A
= 25°C
Unstable
Marginally
Stable
ESR (Ohms)
10
mF
0.50 22
mF
47
mF
0.40 100
mF
0.30
Stable
0.20
0.1
Stable
0.10
0.00
Note − Optimum stability uses a 22
mF
output capacitor. Output capacitor values
below 10
mF
are not recommended.
0
10
20
50
30
40
60
70
OUTPUT CURRENT (mA)
80
90
100
0.60
Unstable
10
1.0
0.01
10
100
1.0 k
|Z
O
|, MAGNITUDE OF CAPACITOR IMPEDANCE (mW)
10 k
Figure 22. Output Noise Voltage vs.
Output Capacitor Impedance
Figure 23. Output Capacitor ESR Stability vs.
Output Load Current
JUNCTION−TO−AIR (
°
C/W)
150
130
P
D(max)
for T
A
= 50°C
2.8
2.4
Graph represents symmetrical layout
L
2.0 oz.
Copper
L
90
70
50
30
0
10
R
qJA
20
L, LENGTH OF COPPER (mm)
Figure 24. SOP−8 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
R
θ
JA, THERMAL RESISTANCE
JUNCTION−TO−AIR (
°
C/W)
90
80
70
60
50
Free Air
Mounted
Vertically
Minimum
Size Pad
P
D(max)
for T
A
= 50°C
2.0
2.0 oz. Copper
L
1.6
1.2
0.8
0.4
0
L
R
qJA
40
0
5.0
10
15
20
L, LENGTH OF COPPER (mm)
25
30
Figure 25. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
http://onsemi.com
10
PD, MAXIMUM POWER DISSIPATION (W)
100
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎ ÎÎÎ
Î Î
ÎÎÎÎÎÎ
ÎÎÎ
ÎÎ ÎÎÎ
30
40
110
2.0
1.6
1.2
0.8
0.4
50
3.0 mm
2.4
PD, MAXIMUM POWER DISSIPATION (W)
170
R
θ
JA, THERMAL RESISTANCE
3.2
ONSEMI [ ON SEMICONDUCTOR ]
