ADP1871ACPZ-0.3-R7 Analog Devices Inc, ADP1871ACPZ-0.3-R7 Datasheet - Page 33

• Manufacturer Part Number: ADP1871ACPZ-0.3-R7
• Description: 300kHz, Light Load Eff Enabled
• Manufacturer: Analog Devices Inc

Specifications of ADP1871ACPZ-0.3-R7

• Frequency - Max: 300kHz
• Pwm Type: Current Mode
• Number Of Outputs: 1
• Duty Cycle: 84%
• Voltage - Supply: 2.95 V ~ 20 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 10-WFDFN, CSP Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADP1871ACPZ-0.3-R7; ADP1871ACPZ-0.3-R7TR

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.
V
57pF
OUT
C
F
0.1µF
R1 30kΩ
C2
15kΩ
Figure 85. ADP1870 High Current Evaluation Board Schematic (Blue Traces Indicate High Current Paths)
C
571pF
R
47kΩ
R2
1µF
C
C
C1
JP3
1
2
3
4
5
C28
10µF
VIN
COMP/EN
FB
GND
VREG
ADP1870/
ADP1871
PGND
DRVH
DRVL
BST
SW
10
9
8
7
6
100kΩ
C12
100nF
0Ω
R4
R5
HIGH VOLTAGE INPUT
Rev. A | Page 33 of 44
V
Q1
Q3
IN
= 12V
Q2
Q4
22µF
MURATA: (HIGH VOLTAGE INPUT CAPACITORS)
PANASONIC: (OUTPUT CAPACITORS)
INFINEON MOSFETs:
WÜRTH INDUCTORS:
C3
22µF, 25V, X7R, 1210 GRM32ER71E226KE15L
270µF, SP-SERIES, 4V, 7mΩ EEFUE0G271LR
BSC042N03MS G (LOWER SIDE)
BSC080N03MS G (UPPER SIDE)
1µH, 3.3mΩ, 20A 7443552100
Figure 85 shows the schematic of a typical ADP1870/ADP1871
used for a high current application. Blue traces denote high current
pathways. VIN, PGND, and V
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.
R6
2Ω
C13
1.5nF
1.0µH
22µF
C4
C24
N/A
270µF
22µF
C20
C5
+
C25
N/A
+
22µF
270µF
C6
C21
+
C26
N/A
V
22µF
+
OUT
270µF
C7
C22
+
= 1.8V, 15A
C27
N/A
OUT
N/A
+
C8
270µF
C23
traces should be wide and
+
ADP1870/ADP1871
C14 TO C19
N/A
N/A
C9
+