Step-Down Controllers with
Synchronous Rectifier for CPU Power
____________________________________________Application Circuits (continued)
10
V+
6
11
14
2
VL
BST
V
SHDN
IN
10.5V to
28V
2X
D1
22μF
35V
0.01μF
SKIP
4.7μF
16
Q1
DH
15
8
LX
MAX797
D3
CSH
T1
L1
10μH
1.7Ω
3
REF
CSL
DL
1
5
9
SS
3X
100μF
16V
0.01μF
I
Q2
13
OUT
D2
2.5A
12
SYNC
7
PGND
FB
GND
0.025Ω
0.33μF
4
1.0k
3
2
7
0.1μF
6
MAX495
4
D1, D3 CENTRAL SEMI. CMPSH-3
D2 NIEC EC10QS02L, SCHOTTKY RECT.
L1 DALE IHSM-4825 10μH 15%
T1 DALE LPE-3325-A087, CURRENT TRANSFORMER, 1:70
Q1, Q2 MOTOROLA MMSF5N03HD
39k
0.33μF
Figure 22. Battery-Charger Current Source
______________________________________________________________________________________ 31