MAX15026_12 Datasheet, PDF (21/23 Pages) Maxim Integrated Products – Low-Cost, Small, 4.5V to 28V Wide Operating Range, DC-DC Synchronous Buck Controller

Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
Typical Application Circuits (continued)
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.
V_IN
+12V
PGOOD
IN
DH
MAX15026
V_CC
LX
PGOOD
BST
LIM
DL
Q1
C_BST
L1
V_OUT
C_F1
Q2
ENABLE
R3
C2
C3
R_LIM
C4
EN
COMP
FB
DRV
C1
GND
RT
RT
R2
R1
V_AUX
4.5V TO 5.5V
Figure 7. Operation with Auxiliary 5V Supply
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