Datasheet

-40 -20 0 20 40 60 80 100
0
10
20
30
40
50
60
70
R
DSON
(m)
TEMPERATURE (°C)
High-Side R
DSon
(m)
Low-Side R
DSon
(m)
0 20 40 60 80 100120140160180
0
200
400
600
800
1000
1200
1400
1600
1800
FREQUENCY (kHz)
R
FRQ
(k)
-40°C
25°C
125°C
-40 -20 0 20 40 60 80 100
-1.0
-0.5
0.0
0.5
1.0
V
OUT
REGULATION (%)
TEMPERATURE (°C)
3 6 9 12 15 18
5
6
7
8
9
10
QUIESCENT CURRENT (mA)
INPUT VOLTAGE (V)
-40°C
25°C
85°C
0 1 2 3 4 5
-0.10
-0.05
0.00
0.05
0.10
LOAD REGULATION (%)
LOAD CURRENT (A)
3 6 9 12 15 18
-0.10
-0.05
0.00
0.05
0.10
LINE REGULATION (%)
INPUT VOLTAGE, PVIN (V)
LM21305
www.ti.com SNVS639F –DECEMBER 2009–REVISED MARCH 2013
Typical Performance Characteristics (continued)
Unless otherwise specified: V
IN
= 12V, V
OUT
= 3.3V, f
S
= 500 kHz, T
A
= 25°C, L = 3.3 µH, C
OUT
= 100 µF ceramic.
Load Regulation (%) Line Regulation (%)
Figure 8. Figure 9.
V
OUT
Regulation (%) vs. Temperature Quiescent Current, Not Switching
Figure 10. Figure 11.
High-Side and Low-Side MOSFET R
DSon
vs. Temperature Switching Frequency vs. R
FRQ
Figure 12. Figure 13.
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