Datasheet


SLVS433A − SEPTEMBER 2002 − REVISED FEBRUARY 2005
www.ti.com
7
TYPICAL CHARACTERISTICS
Figure 1
0
10
20
30
40
50
60
−40 0 25 85 125
VIN = 3.3 V
I
O
= 6 A
Drain Source On-State Reststance − m
DRAIN-SOURCE
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
Ω
T
J
− Junction Temperature − °C
Figure 2
0
10
20
30
40
50
60
−40 0 25 85 125
VIN = 5 V
I
O
= 6 A
DRAIN-SOURCE
ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
T
J
− Junction Temperature − °C
Drain Source On-State Reststance − m
Ω
Figure 3
250
350
450
550
650
750
−40 0 25 85 125
T
J
− Junction Temperature − °C
f − Internally Set Oscillator Frequency − kHz
INTERNALLY SET
OSCILLATOR FREQUENCY
vs
JUNCTION TEMPERATURE
SYNC ≥ 2.5 V
SYNC ≤ 0.8 V
Figure 4
200
300
400
500
600
700
800
−40 0 25 85 125
T
J
− Junction Temperature − °C
f − Externally Set Oscillator Frequency − kHz
EXTERNALLY SET
OSCILLATOR FREQUENCY
vs
JUNCTION TEMPERATURE
RT = 68 k
RT = 100 k
RT = 180 k
Figure 5
0.885
0.887
0.889
0.891
0.893
0.895
−40 0 25 85 125
T
J
− Junction Temperature − °C
− Voltage Reference − V
VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
V
ref
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
012345678
I
L
− Load Current − A
Device Power Losses − W
DEVICE POWER LOSSES AT T
J
= 125°C
vs
LOAD CURRENT
T
J
= 125°C
f
s
= 700 kHz
V
I
= 3.3 V
V
I
= 5 V
Figure 6
Figure 7
0.885
0.887
0.889
0.891
0.893
0.895
3 3.5 4 4.5 5 5.5 6
f
s
= 550 kHz
T
A
= 85°C,
I
O
= 3 A
V
I
− Input Voltage − V
OUTPUT VOLTAGE REGULATION
vs
INPUT VOLTAGE
− Output Voltage Regulation − V
V
O
Figure 8
−20
0
20
40
60
80
100
120
140
1 100 1 k 1 M
−200
−180
−160
−140
−120
−100
−80
−60
−40
−20
0
10 10 k 100 k 10 M
f − Frequency − Hz
Gain − dB
ERROR AMPLIFIER
OPEN LOOP RESPONSE
Phase − Degrees
Phase
Gain
R
L
= 10 kΩ,
C
L
= 160 pF,
T
A
= 25°C
Figure 9
2.75
2.90
3.05
3.20
3.35
3.50
3.65
−40 0 25 85 12
5
T
J
− Junction Temperature − °C
Internal Slow-Start Time − ms
INTERNAL SLOW-START TIME
vs
JUNCTION TEMPERATURE
3.80