MAX15041 Maxim Integrated Products, MAX15041 Datasheet - Page 15

• Manufacturer Part Number: MAX15041
• Description: Step-Down DC-DC Regulator
• Manufacturer: Maxim Integrated Products

2) Place capacitors on V
3) Keep the high-current paths as short and wide as
Figure 3. Typical Operating Circuit 1 (4.5V to 28V Input Buck Converter)
Table 1. Typical Component Values for Common Output-Voltage Settings
Step-Down DC-DC Regulator with Internal Switches
possible to the IC and the corresponding pin using
direct traces. Keep the power ground plane (con-
nected to PGND) and signal ground plane (connect-
ed to SGND) separate. PGND and SGND connect at
only one common point near the input bypass
capacitor return terminal.
possible. Keep the path of switching current short
and minimize the loop area formed by LX, the output
capacitors, and the input capacitors.
4.5V TO 28V
V
INPUT
OUT
PGOOD
5.0
3.3
2.5
1.8
1.2
C
47µF
(V)
IN
Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM
10kΩ
______________________________________________________________________________________
R
PU
L (µH)
DD
4.7
4.7
3.3
2.2
2.2
C
1µF
, IN, and SS as close as
VDD
C
0.01µF
SS
EN
V
PGOOD
IN
SS
DD
C
I.C.
C
MAX15041
12
22
33
47
8
(nF)
D
SGND
COMP
PGND
BST
LX
FB
100pF
4) Connect IN, LX, and PGND separately to a large
5) Ensure all feedback connections are short and
6) Route high-speed switching nodes (such as LX and
C
CC
R
47Ω
copper area to help cool the IC to further improve
efficiency.
direct. Place the feedback resistors and compensa-
tion components as close as possible to the IC.
BST) away from sensitive analog areas (such as FB
and COMP).
BST
R
C
C
2.70
1.80
1.50
1.00
0.68
BST
(kΩ)
R
1.8kΩ
C
12nF
C
C
4.7µH
Calculate R
L
Setting the Output Voltage section.
22µF
C
OUT
Select R
5kΩ ≤ R
1
using the equation in the
R
1
www.DataSheet4U.com
and R
2
2
≤ 50kΩ
so that:
R
45.3kΩ
1%
R
10.0kΩ
1%
1
1
2
OUTPUT = 3.3V
15