Datasheet

OUTPUT LOAD CURRENT (mA)
OPERATING ON TIME (Ps)
3.3V
OUT
1.242V
OUT
5.0V
OUT
0
1
2
3
4
5
0 200 400 600 800 1000
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 12V
V
IN
= 4.5V
40
50
60
70
80
90
100
10 100 1000 10000
OUTPUT LOAD CURRENT (mA)
OPERATING ON TIME (Ps)
3.3V
OUT
1.242V
OUT
0 200 400 600 800 1000
0
4
8
12
16
20
MINIMUM ON TIME (ns)
V
IN
= 4.5V
V
IN
= 12V
V
IN
= 24V
0
20
40
60
80
100
120
140
160
-20 -40 0 20 40 60 80 100 120 140
JUNCTION TEMPERATURE (°C)
0
2
4
6
8
10
V
PGATE
(V)
0 50 100 150
T (ns)
C
PGATE
= 540 pF
C
PGATE
= 1020 pF
C
PGATE
= 110 pF
C
PGATE
= 1800 pF
4
12
20
28 36
3.0
3.5
4.0
5.0
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE - PGATE VOLTAGE (V)
T
J
=125qC
T
J
= 25qC
T
J
= -40qC
4.5
6.0
LM3485
www.ti.com SNVS178G –JANUARY 2002–REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
Unless otherwise specified, T
J
= 25°C
PGATE Voltage Typical V
PGATE
vs
vs Time
Input Voltage V
IN
= 9V
Minimum ON Time Operating ON Time vs
vs Output Load Current
Temperature (V
IN
= 4.5V)
Operating ON Time vs Efficiency vs
Output Load Current Load Current
(V
IN
= 12V) (V
OUT
= 3.3V, L = 6.8µH)
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