參數(shù)資料
型號： ADP1875ARQZ-0.3-R7
廠商： ANALOG DEVICES INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16
封裝： ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁數(shù)： 30/44頁
文件大?。?/td> 2475K
代理商： ADP1875ARQZ-0.3-R7
ADP1874/ADP1875
Rev. 0 | Page 36 of 44
LAYOUT CONSIDERATIONS
The performance of a dc-to-dc converter depends highly on how
the voltage and current paths are configured on the printed circuit
board (PCB). Optimizing the placement of sensitive analog and
power components is essential to minimize output ripple,
maintain tight regulation specifications, and reduce PWM jitter
and electromagnetic interference.
Figure 90 shows the schematic of a typical ADP1874/ADP1875
used for a high current application. Blue traces denote high current
pathways. VIN, PGND, and VOUT traces should be wide and
possibly replicated, descending down into the multiple layers.
Vias should populate, mainly around the positive and negative
terminals of the input and output capacitors, alongside the source
of Q1/Q2, the drain of Q3/Q4, and the inductor.
10k
VREG
MURATA: (HIGH VOLTAGE INPUT CAPACITORS)
22F, 25V, X7R, 1210 GRM32ER71E226KE15L
PANASONIC: (OUTPUT CAPACITORS)
270F, SP-SERIES, 4V, 7m EEFUE0G271LR
INFINEON MOSFETs:
BSC042N03MS G (LOWER SIDE)
BSC080N03MS G (UPPER SIDE)
WRTH INDUCTORS:
1H, 3.8m, 16A 7443552100
Q3
Q4
Q1
Q2
HIGH VOLTAGE INPUT
VIN = 12V
CBST
100nF
VOUT = 1.8V, 15A
C3
22F
C4
22F
C5
22F
C6
22F
C7
22F
C8
N/A
C9
N/A
C23
270F
+
C22
270F
+
C21
270F
+
C20
270F
+
C27
N/A
C14 TO C19
N/A
+
C26
N/A
+
C25
N/A
+
C24
N/A
+
1.0H
RSNB
2
CSNB
1.5nF
RTOP 2k
R7 10k
RBOT
1k
VOUT
1
VIN
16
BST
2
COMP
15
SW
3
EN
14
DRVH
5
GND
12
DRVL
ADP1874/
ADP1875
CC
430pF
CPAR
53pF
RC
57k
C1
1F
CVIN
22F
C2
0.1F
JP3
RRES
100k
4
FB
13
PGND
6
RES
11
PGOOD
7
VREG
10
SS
8
VREG_IN
9
TRACK
5k
VREG
CSS
34nF
VREG
09
34
7-
08
1
Figure 90. ADP1874 High Current Evaluation Board Schematic (Blue Traces Indicate High Current Paths)
09
34
7-
0
92
INPUT CAPACITORS
ARE MOUNTED CLOSE
TO DRAIN OF Q1/Q2
AND SOURCE OF Q3/Q4
SEPARATE ANALOG
GROUND PLANE FOR
COMPENSATION AND
FEEDBACK RESISTORS
SENSITIVE ANALOG
COMPONENTS
LOCATED FAR
FROM NOISY
POWER SECTION
OUTPUT
CAPACITORS
ARE MOUNTED
AT RIGHTMOST
AREA OF
EVALUATION
BOARD
Figure 91. Overall Layout of the ADP1870 High Current Evaluation Board
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