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SLVS619A – NOVEMBER 2005 – REVISED FEBRUARY 2006
TYPICAL CHARACTERISTICS
DRAIN-SOURCE ON-STATE
RESISTANCE
vs
JUNCTION TEMPERATURE
120
100
DRAIN-SOURCE ON-STATE
RESISTANCE
vs
JUNCTION TEMPERATURE
V
I
= 5 V
80
INTERNALLY SET OSCILLATOR
FREQUENCY
vs
JUNCTION TEMPERATURE
f − Internally Set Oscillator Frequency −kHz
750
Drain-Source On-State Resistance
−
mW
V
I
= 3.3 V
100
Drain-Source On-State Resistance − mW
650
SYNC
≥
2.5 V
80
60
40
60
550
40
450
SYNC
≤
0.8 V
20
0
−40
0
25
85
125
T
J
−
Junction Temperature
−
°C
20
350
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
f
−
Externally Set Oscillator Frequency
−
kHz
1200
RT = 43 kW
1150
Figure 2.
EXTERNALLY SET OSCILLATOR
FREQUENCY
vs
JUNCTION TEMPERATURE
600
RT = 100 kW
Figure 3.
VOLTAGE REFERENCE
vs
JUNCTION TEMPERATURE
0.895
Vref − Voltage Reference − V
0.893
550
0.891
1100
500
0.889
1050
450
0.887
1000
−40
0
25
85
o
125
400
−40
0
25
85
o
125
0.885
−40
0
25
85
125
T
J
− Junction Temperature
−
C
T
J
− Junction Temperature − C
T
J
− Junction Temperature −
°C
Figure 4.
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
Figure 5.
INTERNAL SLOW-START TIME
vs
JUNCTION TEMPERATURE
3.80
3.65
3.50
3.35
3.20
3.05
2.90
2.75
−40
Device Power Losses
−
W
1.2
1
0.8
0.6
Figure 6.
DEVICE POWER LOSSES
vs
LOAD CURRENT
T
A
= 25 C,
f
s
= 700 kHz,
V
I
= 5 V,
V
O
= 3.3 V
o
−40
Phase − Degrees
−60
−80
−100
−120
−140
−160
−180
Internal Slow-Start Time − ms
0.4
0.2
−200
10 k 100 k 1 M 10 M
f − Frequency − Hz
0
25
85
T
J
− Junction Temperature −
°C
125
0
0
0.5
1.5
2.5
1
2
I
O
−
Output Current
−
A
3
Figure 7.
Figure 8.
Figure 9.
7
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