MAX799 MAXIM [Maxim Integrated Products], MAX799 Datasheet - Page 29

• Manufacturer Part Number: MAX799
• Description: Step-Down Controllers with Synchronous Rectifier for CPU Power
• Manufacturer: MAXIM [Maxim Integrated Products]

Figure 18. High-Accuracy Adjustable-Output Application
Figure 19. Negative-Output (Inverting Topology) Power Supply
____________________________________________Application Circuits (continued)
V
ADJUST RANGE = 2.5V TO 4V AS SHOWN.
OMIT R2 FOR V
USE EXTERNAL REFERENCE
(MAX872) FOR BETTER ACCURACY.
OUT
= V
INPUT
4.5V TO 25V
REF
INPUT
0.01μF
(
1 + –––
OUT
R1
R2
= 2.5V.
22μF
)
______________________________________________________________________________________
22μF
SKIP
SS
Synchronous Rectifier for CPU Power
GND
V+
MAX797
SHDN
SYNC
SHDN
0.33μF
V+
SYNC
REF
VL
MAX797
PGND
CSH
BST
CSL
DH
LX
DL
FB
FB
1000pF
10k
REF
Step-Down Controllers with
VL
PGND
CSH
GND
BST
CSL
SKIP
DH
DL
LX
0.33μF
Q1
Q2
1N4148
0.1μF
0.025Ω
51k
5%
L1
TO
VL
L1
Si9410
MAX495
4.7μF
1N5819
Si9410
R
SENSE
L1 = DALE LPE6562-A093
4.7μF
150μF
51k
5%
200k
5%
150μF
-5V AT 1.5A
3.3V ±1.8%
R1
63.4k
0.1%
R2
200k
0.1%
OUTPUT
REMOTE
SENSE
POINT
29