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TPS54311, TPS54312
TPS54313, TPS54314
TPS54315, TPS54316
SLVS416A – FEBRUARY 2002 – JULY 2003
TYPICAL CHARACTERISTICS
DRAIN-SOURCE ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
120
Drain-Source On-State Resistance –
Ω
VI = 3.3 V
100
IO = 3 A
Drain-Source On-State Resistance –
Ω
DRAIN-SOURCE ON-STATE RESISTANCE
vs
JUNCTION TEMPERATURE
VI = 5 V
80
IO = 3 A
f – Internally Set Oscillator Frequency –kHz
100
750
INTERNALLY SET OSCILLATOR
FREQUENCY
vs
JUNCTION TEMPERATURE
650
FSEL
≥
2.5 V
80
60
40
60
550
40
450
FSEL
≤
0.8 V
20
0
–40
0
25
85
125
TJ – Junction Temperature –
°C
20
350
0
–40
0
25
85
125
250
–40
0
25
85
125
TJ – Junction Temperature –
°C
TJ – 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
Figure 3
OUTPUT VOLTAGE REGULATION
vs
INPUT VOLTAGE
0.8950
TA = 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
TJ – Junction Temperature –
°C
4
5
VI – Input Voltage – V
6
TJ – Junction Temperature –
°C
Figure 4
Figure 5
INTERNAL SLOW-START TIME
vs
JUNCTION TEMPERATURE
0
3.80
3.65
Device Power Losses – W
3.50
3.35
3.20
3.05
2.90
0.25
2.75
–40
0
25
85
TJ – Junction Temperature –
°C
125
0
0
2.25
2
1.75
1.5
1.25
1
0.75
0.5
–20
–40
Phase – Degrees
–60
Internal Slow-Start Time – ms
Figure 6
DEVICE POWER LOSSES
vs
LOAD CURRENT
TJ – 125°C,
fs = 700 kHz
ERROR AMPLIFIER
OPEN LOOP RESPONSE
140
120
100
Gain – dB
80
60
40
20
0
–20
0
10
100
1k
Gain
Phase
RL= 10 kΩ,
CL = 160 pF,
TA = 25°C
–80
–100
–120
–140
–160
–180
VI = 3.3 V
VI = 5 V
–200
10 k 100 k 1 M 10 M
f – Frequency – Hz
1
2
3
IL – Load Current – A
4
Figure 7
Figure 8
Figure 9
7
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