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參數(shù)資料
| 型號(hào)： | LTC3827IG-1#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A DUAL SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 5.30 MM, PLASTIC, SSOP-28 |
| 文件頁(yè)數(shù)： | 17/32頁(yè) |
| 文件大?。?/td> | 448K |
| 代理商： | LTC3827IG-1#TR |
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LTC3827-1
24
38271fe
APPLICATIONS INFORMATION
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the IC. These items are also illustrated graphically in the
layout diagram of Figure 11. Figure 12 illustrates the current
waveforms present in the various branches of the 2-phase
synchronous regulators operating in the continuous mode.
Check the following in your layout:
1. Are the top N-channel MOSFETs M1 and M3 located
within 1cm of each other with a common drain connec-
tion at CIN? Do not attempt to split the input decoupling
for the two channels as it can cause a large resonant
loop.
2. Are the signal and power grounds kept separate? The
combined IC signal ground pin and the ground return
of CINTVCC must return to the combined COUT (–) termi-
nals. The path formed by the top N-channel MOSFET,
Schottky diode and the CIN capacitor should have short
leads and PC trace lengths. The output capacitor (–)
terminals should be connected as close as possible
to the (–) terminals of the input capacitor by placing
the capacitors next to each other and away from the
Schottky loop described above.
3. Do the LTC3827 VFB pins’ resistive dividers connect to
the (+) terminals of COUT? The resistive divider must be
connected between the (+) terminal of COUT and signal
ground. The feedback resistor connections should not
be along the high current input feeds from the input
capacitor(s).
Figure 11. LTC3827-1 Recommended Printed Circuit Layout Diagram
CB2
CB1
RPU
PGOOD1
VPULL-UP
(<8.5V)
CINTVCC
+
CIN
D1
1μF
CERAMIC
M1
M2
M3
M4
D2
+
CVIN
VIN
RIN
ITH1
VFB1
SENSE1+
SENSE1–
PLLLPF
PLLIN/MODE
SGND
RUN1
RUN2
SENSE2–
SENSE2+
VFB2
ITH2
TRACK/SS2
TRACK/SS1
PGOOD1
TG1
SW1
BOOST1
BG1
VIN
PGND
EXTVCC
INTVCC
BG2
BOOST2
SW2
TG2
LTC3827-1
L1
L2
COUT1
VOUT1
GND
VOUT2
38271 F11
+
COUT2
+
RSENSE
fIN
1μF
CERAMIC
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