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SLVS398F – JUNE 2001 – REVISED APRIL 2007
TYPICAL CHARACTERISTICS
DRAIN-SOURCE
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
Drain Source On-State Reststance − m
Ω
VIN = 3.3 V
50
I
O
= 6 A
Drain Source On-State Reststance − m
Ω
60
60
VIN = 5 V
50
I
O
= 6 A
40
DRAIN-SOURCE
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
f − Internally Set Oscillator Frequency − kHz
750
INTERNALLY SET
OSCILLATOR FREQUENCY
vs
JUNCTION TEMPERATURE
650
SYNC
≥
2.5 V
550
40
30
20
30
20
450
SYNC
≤
0.8 V
350
10
0
−40
10
0
−40
0
25
85
T
J
− Junction Temperature −
°C
125
0
25
85
T
J
− Junction Temperature −
°C
125
250
−40
0
25
85
125
T
J
− Junction Temperature −
°C
Figure 1.
EXTERNALLY SET
OSCILLATOR FREQUENCY
vs
JUNCTION TEMPERATURE
f − Externally Set Oscillator Frequency − kHz
800
700
RT = 68 k
600
0.895
Figure 2.
Figure 3.
DEVICE POWER LOSSES
AT T
J
= 125°C
vs
LOAD CURRENT
5
4.5
T
J
= 125°C
f
s
= 700 kHz
V
I
= 3.3 V
VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
V ref − Voltage Reference − V
Device Power Losses − W
0.893
4
3.5
3
2.5
2
1.5
1
0.5
V
I
= 5 V
0.891
500
RT = 100 k
400
300
RT = 180 k
200
−40
0.889
0.887
0.885
0
25
85
125
−40
T
J
− Junction Temperature −
°C
0
25
85
T
J
− Junction Temperature −
°C
125
0
0
1
2
3
4
5
6
7
8
I
L
− Load Current − A
Figure 4.
OUTPUT VOLTAGE REGULATION
vs
INPUT VOLTAGE
0.895
VO − Output Voltage Regulation − V
T
A
= 85°C,
I
O
= 3 A
0.893
140
120
100
Gain − dB
80
60
40
20
Figure 5.
Figure 6.
INTERNAL SLOW-START TIME
vs
JUNCTION TEMPERATURE
0
ERROR AMPLIFIER
OPEN LOOP RESPONSE
3.80
3.65
3.50
3.35
3.20
3.05
2.90
2.75
R
L
= 10 kΩ,
C
L
= 160 pF,
T
A
= 25°C
−20
−40
Phase − Degrees
−60
0.891
Phase
−80
−100
−120
f
s
= 550 kHz
0.889
Gain
−140
−160
0.887
0
−20
1
10
100
−180
−200
1 k 10 k 100 k 1 M 10 M
0.885
3
3.5
4
4.5
5
V
I
− Input Voltage − V
5.5
6
Internal Slow-Start Time − ms
f − Frequency − Hz
−40
0
25
85
125
T
J
− Junction Temperature −
°C
Figure 7.
Figure 8.
Figure 9.
7
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