Rainbow Electronics MAX1638 - Manual (Page 12)

MAX1638
High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
12 ______________________________________________________________________________________
N1
R1
N2
C2
D1
(OPTIONAL)
R9
(OPTIONAL)
R10
(OPTIONAL)
R8
39 Ω
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, 1.0 µ F
CERAMIC
NO
CONNECTION
R5
100k
C9
0.1 µ F
C7
10 µ F
R6
10 Ω
TO V DD
FREQ
D0
D1
D2
D3
D4
LG REF
C5
0.1 µ F
C8
4.7 µ F
D2
CMPSH-3
C4
0.1
µ F
L1
V IN = 5V
C1
R7
39 Ω
LOCAL
BYPASSING
MAX1638
P1
R11
V OUT = 1.3V
TO 3.5V
N3
LOAD
Figure 5. Buck Regulator with High-Side Current Sensing