TPS40020 Datasheet, PDF (19/32 Pages) Texas Instruments – ENHANCED LOW INPUT VOLTAGE MODE SYNCHRONOUS BUCK CONTROLLER

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TPS40020
TPS40021
SLUS535C − MARCH 2003 − REVISED SEPTEMBER 2004
TYPICAL CHARACTERISTICS
1000
900
800
700
600
500
400
300
200
100
20
TIMING RESISTANCE
vs
SWITCHING FREQUENCY
VIN = 3.9 V
40
60
80 100 120 140 160
RT − Timing Resistance − kΩ
Figure 14
SOFT-START CURRENT
vs
JUNCTION TEMPERATURE
3.50
3.45
3.40
3.35
3.30
3.25
3.20
3.15
3.10
3.05
3.00
−50 −25 0
25 50 75 100 125
TJ − Junction Temperature − °C
Figure 15
ILIM OFFSET VOLTAGE
vs
JUNCTION TEMPERATURE
20
15
VDD = 2.0 V
10
5
0
−5
VDD = 3.2 V
−10
−15
VDD = 4.9 V
−20
−50 −25 0
25 50
75 100 125
TJ − Junction Temperature − °C
Figure 16
SHUTDOWN THRESHOLD VOLTAGE
vs
JUNCTION TEMPERATURE
0.30
0.29
0.28
Enable
0.27
0.26
0.25
0.24
Disable
0.23
0.22
0.21
0.20
−50 −25 0
25 50 75 100 125
TJ − Junction Temperature − °C
Figure 17
19