Datasheet

MAX1953/MAX1954/MAX1957
Low-Cost, High-Frequency, Current-Mode PWM
Buck Controller
______________________________________________________________________________________ 13
Figure 3. Typical Application Circuit for the MAX1957
COMP
REFIN
GND
BST
DH
LX
DL
PGND
FB
IN
MAX1957
V
TT
= 1/2 V
DDQ
V
IN
3V TO 5.5V
N1
D1
C7
4.7µF
C6
10µF
C1
3
✕ 22µF
C2
0.1µF
C3
270µF
C4
270µF
C5
270µF
L1
2.7µH
R3
10kΩ
C
C
470pF
C
f
68pF
R
C
51.1kΩ
C8
0.1µF
R1
2kΩ
R2
2kΩ
V
DDQ
C14
1500pF
IN
COMP
GND
BST
DH
LX
DL
PGND
FB
HSD
MAX1954
V
OUT
1.8V AT 20A
V
IN
3V TO 5.5V
D1
C6
10µF
C5
10µF
C4
10µF
C3
10µF
C2
10µF
L1
0.8µH
C7
0.1µF
C13
270µF
C12
270µF
C11
270µF
C10
270µF
C9
270µF
C8
270µF
R1
10kΩ
R2
8.06kΩ
C1
0.22µF
C
C
560pF
C
f
15pF
R
C
270kΩ
N1 N2
N3 N4
V
HSD
10.8V TO 13.2V
Figure 4. 20A Circuit