Step-Down Controllers with
Synchronous Rectifier for CPU Power
FAT, HIGH-CURRENT TRACES
MAIN CURRENT PATH
SENSE RESISTOR
MAX796
MAX797
MAX799
Figure 10. Kelvin Connections for the Current-Sense Resistor
_________________________________________________________Application Circuits
V
(6.5V TO 18V)
IN
+15V
AT
22μF, 35V
250mA
C2
D1
4.7μF
210k, 1%
2
7
11
VL
CMPSH
-3A
49.9k, 1%
C2
4.7μF
C3
15μF
2.5V
SECFB
FB
10
V+
DH
Si9410
16
14
0.01μF
18V
1/4 W
D2
EC11FS1
6
ON/OFF
SHDN
BST
+5V
AT 3A
0.1μF
15
T1
LX
MAX796
20mΩ
15μH
2.2:1
220μF
6.3V
Si9410
13
12
1
4
DL
1N5819
SS
PGND
0.01μF
(OPTIONAL)
8
9
GND
CSH
CSL
22Ω*
4700pF*
SYNC
REF
T1 = TRANSPOWER TTI5870
* = OPTIONAL, MAY NOT BE NEEDED
5
3
0.33μF
Figure 11. +5V/+15V Dual-Output Application (MAX796)
______________________________________________________________________________________ 25
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
