Datasheet

LMR10520
www.ti.com SNVS730B –OCTOBER 2011–REVISED APRIL 2013
Another loss is the power required for operation of the internal circuitry:
P
Q
= I
Q
x V
IN
(27)
I
Q
is the quiescent operating current, and is typically around 3.3mA for the 1.6MHz frequency option.
Typical Application power losses are:
Table 2. Power Loss Tabulation
V
IN
5.0V
V
OUT
3.3V P
OUT
5.78W
I
OUT
1.75A
V
D
0.45V P
DIODE
262mW
F
SW
1.6MHz
I
Q
3.3mA P
Q
16.5mW
T
RISE
4nS P
SWR
28mW
T
FALL
4nS P
SWF
28mW
R
DS(ON)
150mΩ P
COND
306mW
IND
DCR
50mΩ P
IND
153mW
D 0.667 P
LOSS
794mW
η 88% P
INTERNAL
379mW
ΣP
COND
+ P
SW
+ P
DIODE
+ P
IND
+ P
Q
= P
LOSS
(28)
ΣP
COND
+ P
SWF
+ P
SWR
+ P
Q
= P
INTERNAL
(29)
P
INTERNAL
= 379mW (30)
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