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ꢀꢁ ꢂ ꢃꢄ ꢅꢆ ꢇ
SLVS398D − JUNE 2001 − REVISED JULY 2003
TYPICAL CHARACTERISTICS
INTERNALLY SET
DRAIN-SOURCE
DRAIN-SOURCE
OSCILLATOR FREQUENCY
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
750
vs
JUNCTION TEMPERATURE
60
50
40
60
VIN = 3.3 V
VIN = 5 V
I
= 6 A
O
50
650
I
= 6 A
O
SYNC ≥ 2.5 V
40
550
30
20
30
20
450
SYNC ≤ 0.8 V
350
250
10
0
10
0
−40
0
25
85
125
−40
0
25
85
125
−40
0
25
85
125
T
J
− Junction Temperature − °C
T
J
− Junction Temperature − °C
T
J
− Junction Temperature − °C
Figure 1
Figure 2
Figure 3
EXTERNALLY SET
OSCILLATOR FREQUENCY
vs
DEVICE POWER LOSSES AT T = 125°C
J
VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
vs
LOAD CURRENT
JUNCTION TEMPERATURE
5
0.895
0.893
0.891
0.889
800
700
600
T
= 125°C
= 700 kHz
J
4.5
4
f
s
RT = 68 k
RT = 100 k
RT = 180 k
V
= 3.3 V
I
3.5
3
2.5
2
500
400
300
200
1.5
1
V
I
= 5 V
0.887
0.885
0.5
0
0
1
2
3
4
5
6
7
8
−40
0
25
85
125
−40
0
25
85
125
I
− Load Current − A
L
T
J
− Junction Temperature − °C
T
J
− Junction Temperature − °C
Figure 6
Figure 4
Figure 5
INTERNAL SLOW-START TIME
vs
JUNCTION TEMPERATURE
OUTPUT VOLTAGE REGULATION
ERROR AMPLIFIER
OPEN LOOP RESPONSE
vs
INPUT VOLTAGE
0
140
3.80
0.895
0.893
0.891
0.889
R
C
T
= 10 kΩ,
= 160 pF,
= 25°C
L
L
A
T
= 85°C,
= 3 A
A
−20
120
100
80
I
O
3.65
3.50
−40
−60
−80
Phase
Gain
f
= 550 kHz
3.35
s
−100
−120
−140
−160
−180
−200
60
3.20
3.05
40
20
0.887
0.885
2.90
2.75
0
−20
1
10 100 1 k 10 k 100 k 1 M 10 M
−40
0
25
85
125
3
3.5
4
4.5
5
5.5
6
f − Frequency − Hz
T
J
− Junction Temperature − °C
V − Input Voltage − V
I
Figure 7
Figure 8
Figure 9
7
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