參數(shù)資料
型號: LTC3708
廠商: Linear Technology Corporation
英文描述: No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking
中文描述: 無檢測電阻低EMI,同步DC / DC控制器的輸出跟蹤
文件頁數(shù): 23/28頁
文件大?。?/td> 372K
代理商: LTC3708
23
LTC3808
3808f
APPLICATIU
The N-channel MOSFET in Si7540DP has 0.017
R
DS(ON)
.
The short circuit current is:
W
U
U
I
mV
A
SC
=
=
90
0 017
.
5 3
.
So the inductor current rating should be higher than 5.3A.
The PLLLPF pin will be left floating, so the LTC3808 will
operate at its default frequency of 550kHz. For continuous
Burst Mode operation with 600mA I
RIPPLE
, the required
minimum inductor value is:
L
V
600
kHz
mA
V
V
H
MIN
=
=
μ
1 8
.
550
1
1 8
2 75
.
1 88
.
.
A 6A 2.2
μ
H inductor works well for this application.
C
IN
will require an RMS current rating of at least 1A at
temperature. A C
OUT
with 0.1 ESR will cause approxi-
mately 60mV output ripple. In most applications, the
requirements for these capacitors are fairly similar.
PC Board Layout Checklist
When laying out the printed circuit board, use the follow-
ing checklist to ensure proper operation of the LTC3808.
The power loop (input capacitor, MOSFET, inductor,
output capacitor) should be as small as possible and
isolated as much as possible from LTC3808.
Put the feedback resistors close to the V
FB
pins. The I
TH
compensation components should also be very close to
the LTC3808.
The current sense traces (SENSE
+
and SENSE
) should
be Kelvin connections right at the P-channel MOSFET
source and drain.
Keeping the switch node (SW) and the gate driver nodes
(TG, BG) away from the small-signal components, espe-
cially the feedback resistors, and I
TH
compensation
components.
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