Datasheet

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BLOCK DIAGRAM
7FB1
+
Soft Start
1
C
COMP
+
S Q
QR
R
+
Current
Comparator
BP
f(I
DRAIN1
) + DC(ofst)
2
1
3
Anti-Cross
Conduction
1.2 MHz
Oscilator
Divide
by 2/4
Ramp
Gen 1
Ramp
Gen 2
CLK1
CLK2
BP
CLK1
Weak
Pull-Down
MOSFET
5EN1
6EN2
6 mA6 mA
VDD2
Internal
Control
10SEQ
150 kW
150 kW
Output
Undervoltage
Detect
BP
FB1
FB2
CLK1
4GND
8FB2
+
Soft Start
2
C
COMP
+
S Q
QR
R
+
Current
Comparator
BP
13
14
12
Anti-Cross
Conduction
BP
CLK2
Weak
Pull-Down
MOSFET
11BP
9ILIM2
150 kW
150 kW
BP
CLK2
4GND
Level
Select
5.25-V
Regulator
References
BOOT1
PVDD1
SW1
BOOT2
PVDD2
SW2
f(I
DRAIN2
) + DC(ofst)
0.8 V
REF
I
MAX2
(Set to one of two limits)
f(I
DRAIN1
)
f(I
MAX1
)
Overcurrent Comp
f(I
SLOPE1
)
Level
Shift
Level
Shift
f(I
DRAIN2
)
f(I
MAX2
)
f(I
SLOPE2
)
FET
Switch
TSD
PVDD2
f(I
SLOPE1
)
f(I
SLOPE2
)
SD1
SD2
UVLO
0.8 V
REF
SD2
0.8 V
REF
SD1
UDG-07007
Overcurrent Comp
R
COMP
R
COMP
TPS54283 , , TPS54286
SLUS749C – JULY 2007 – REVISED OCTOBER 2007
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Product Folder Link(s): TPS54283 TPS54286