Datasheet

LM2931, NCV2931 Series
http://onsemi.com
10
0.20
0.30
0.00
ESR (Ohms)
Figure 22. Output Noise Voltage vs.
Output Capacitor Impedance
Figure 23. Output Capacitor ESR Stability vs.
Output Load Current
OUTPUT CURRENT (mA)
10 50 90 100
0.50
0.60
Note - Optimum stability uses a 22 mF
output capacitor. Output capacitor values
below 10 mF are not recommended.
Unstable
Stable
0.1
1.0
0.01
V
n
, OUTPUT NOISE VOLTAGE (mVrms)
|Z
O
|, MAGNITUDE OF CAPACITOR IMPEDANCE (mW)
10 100 1.0 k 10 k
10
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
Stable
0
0.10
0.40
20 6030 7040 80
22 mF
10 mF
47 mF
100 mF
40
50
60
70
80
90
100
0
0.4
0.8
1.2
1.6
2.0
2.4
010203025155.0
L, LENGTH OF COPPER (mm)
P
D(max)
for T
A
= 50°C
Minimum
Size Pad
P
D
L
L
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
, MAXIMUM POWER DISSIPATION (W)
Free Air
Mounted
Vertically
30
50
70
90
110
130
150
0.4
0.8
1.2
1.6
2.0
2.4
2.8
02030504010
L, LENGTH OF COPPER (mm)
170 3.2
R
q
JA
P
D
R , THERMAL RESISTANCE
JAθ
JUNCTION-TO-AIR ( C/W)°
, MAXIMUM POWER DISSIPATION (W)
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
ÎÎÎ
2.0 oz.
Copper
Graph represents symmetrical layout
3.0 mmL
L
R
q
JA
2.0 oz. Copper
R , THERMAL RESISTANCE
JAθ
JUNCTION-TO-AIR ( C/W)°
Figure 24. SOP−8 Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
Figure 25. DPAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
P
D(max)
for T
A
= 50°C