Rainbow Electronics MAX15026 - Manual (Page 21)

MAX15026
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
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Typical Application Circuits (continued)
R1
R3
R LIM
DH
LX
L1
BST
DL
ENABLE
V AUX
4.5V TO 5.5V
PGOOD
V IN
+12V
DRV
GND
RT
IN
V CC
PGOOD
LIM
EN
COMP
FB
R2
RT
C1
C4
C3
C2
Q2
C F1
C
BST
Q1
V OUT
MAX15026
Auxiliary 5V Supply Operation
Figure 7 shows an application circuit for a +12V supply to drive the external MOSFETs and an auxiliary +5V supply
to power the device.
Figure 7. Operation with Auxiliary 5V Supply