TPS54418
SLVS946A –MAY 2009–REVISED MAY 2010
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FUNCTIONAL BLOCK DIAGRAM
PWRGD
EN
VIN
ihys
i1
Shutdown
Thermal
Shutdown
UVLO
Enable
Comparator
93%
Logic
Shutdown
Shutdown
Logic
107%
Enable
Threshold
Boot
Charge
Voltage
Reference
Boot
UVLO
Minimum
COMP Clamp
Current
Sense
ERROR
AMPLIFIER
PWM
Comparator
VSENSE
SS
BOOT
Logic and PWM
Latch
Shutdown
Logic
Slope
Compensation
S
COMP
PH
Frequency
Shift
Maximum
Clamp
Overload
Recovery
Oscillator
with PLL
GND
TPS54418RTE Block Diagram
RT/CLK
AGND
POWERPAD
TYPICAL CHARACTERISTICS CURVES
HIGH SIDE AND LOW SIDE Rdson vs TEMPERATURE
FREQUENCY vs TEMPERATURE
550
540
530
0.055
High Side Rdson
= 3.3 V
RT = 400 kW,
= 3.3 V
V
I
V
I
0.05
Low Side Rdson
= 3.3 V
V
I
0.045
0.04
High Side Rdson
V = 5 V
520
510
500
I
0.035
0.03
490
Low Side Rdson
= 5 V
V
I
480
470
0.025
0.02
460
450
-50
-25
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
150
TJ - Junction Temperature - °C
T
- Junction Temperature - °C
J
Figure 1.
Figure 2.
6
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