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TPS54311, TPS54312
TPS54313, TPS54314
TPS54315, TPS54316
SLVS416B
−
FEBRUARY 2002
−
REVISED APRIL 2005
TYPICAL CHARACTERISTICS
DRAIN-SOURCE ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
120
100
80
60
40
20
0
Drain-Source On-State Resistance
−
Ω
V
I
= 3.3 V
I
O
= 3 A
Drain-Source On-State Resistance
−
Ω
DRAIN-SOURCE ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
V
I
= 5 V
80
I
O
= 3 A
f
−
Internally Set Oscillator Frequency
−kHz
100
750
INTERNALLY SET OSCILLATOR
FREQUENCY
vs
JUNCTION TEMPERATURE
650
FSEL
≥
2.5 V
60
550
40
450
FSEL
≤
0.8 V
20
350
−40
0
25
85
125
0
−40
0
25
85
125
250
−40
0
25
85
125
T
J
−
Junction Temperature
−
°C
T
J
−
Junction Temperature
−
°C
Figure 1
EXTERNALLY SET OSCILLATOR
FREQUENCY
vs
JUNCTION TEMPERATURE
f
−
Externally Set Oscillator Frequency
−
kHz
800
RT = 68 k
Vref
−
Voltage Reference
−
V
700
600
RT = 100 k
500
400
RT = 180 k
300
200
−40
0.893
0.895
Figure 2
VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
VO
−
Output Voltage Regulation
−
V
T
J
−
Junction Temperature
−
°C
Figure 3
OUTPUT VOLTAGE REGULATION
vs
INPUT VOLTAGE
0.8950
T
A
= 85°C
0.8930
0.891
0.8910
0.889
0.8890
f = 350 kHz
0.887
0.8870
0
25
85
125
0.885
−40
0.8850
0
25
85
125
3
T
J
−
Junction Temperature
−
°C
4
5
V
I
−
Input Voltage
−
V
6
T
J
−
Junction Temperature
−
°C
Figure 4
Figure 5
Figure 6
ERROR AMPLIFIER
OPEN LOOP RESPONSE
140
120
100
Gain
−
dB
80
60
40
20
0
−20
0
10
100
1k
Gain
Phase
R
L
= 10 kΩ,
C
L
= 160 pF,
T
A
= 25°C
0
−20
−40
Phase
−
Degrees
−60
−80
−100
−120
−140
−160
−180
−200
10 k 100 k 1 M 10 M
Internal Slow-Start Time
−
ms
INTERNAL SLOW-START TIME
vs
JUNCTION TEMPERATURE
3.80
3.65
Device Power Losses
−
W
3.50
3.35
3.20
3.05
2.90
2.75
−40
0
25
85
T
J
−
Junction Temperature
−
°C
125
2.25
2
1.75
1.5
1.25
1
0.75
0.5
0.25
0
0
DEVICE POWER LOSSES
vs
LOAD CURRENT
T
J
−
125°C,
f
s
= 700 kHz
V
I
= 3.3 V
V
I
= 5 V
f
−
Frequency
−
Hz
1
2
3
I
L
−
Load Current
−
A
4
Figure 7
Figure 8
Figure 9
7
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