Datasheet

MAX1638
High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
12 ______________________________________________________________________________________
N1
R1
N2
C2
D1
(OPTIONAL)
R9
(OPTIONAL)
R10
(OPTIONAL)
R8
39Ω
C12
3.3nF
C11
3.3nF
V
CC
V
DD
CSH
PWROK
CSL
BST
DH
LX
DL
PGND
FB
PDRV
NDRV
AGND
REF
CC1
CC2
CC2
CC1
RC1
TO
AGND
C6, 1.0μF
CERAMIC
NO
CONNECTION
R5
100k
C9
0.1μF
C7
10μF
R6
10Ω

TO V
DD
FREQ
D0
D1
D2
D3
D4
LG
REF
C5
0.1μF
C8
4.7μF
D2
CMPSH-3
C4
0.1μF
L1
V
IN
= 5V
C1
R7
39Ω
LOCAL
BYPASSING
MAX1638
P1
R11
V
OUT
= 1.3V
TO 3.5V
N3
LOAD
Figure 5. Buck Regulator with High-Side Current Sensing