Rainbow Electronics MAX15023 - Manual (Page 11)

MAX15023
Wide 4.5V to 28V Input, Dual-Output
Synchronous Buck Controller
______________________________________________________________________________________ 11
Functional Diagram
OSCILLATOR
ENABLE LOGIC
VREF
RT
EN1
ENABLE1 COMPARATOR
THERMAL
SHUTDOWN
BANDGAP REFERENCE
STARTUP
BIAS
VREF
VREF = 0.6V VREF
EN2
SGND
IN
LIM2 LIM1
V
CC
ENABLE2 COMPARATOR IN
UVLO V
CC
UVLO
INTERNAL VOLTAGE
REGULATOR
LIM
CURRENT
GENERATOR
MAX15023 GEN
VREF
CK2 CK1
ENABLE1
ENABLE2
VREF CK2 LIM2 SGND
LIM1 CK1
ENABLE1
ENABLE1
g M
V
REF
ENABLE2
DC-DC CONVERTER 2
DC-DC CONVERTER 1
SOFT-START/ STOP LOGIC
AND
HICCUP LOGIC
COMP2
BST2
DH2
PGND2
PGOOD2
FB2
DL2
LX2
MAX15023
VREF
0.925 x V
REF
CK1
FB1
DAC_VREF
PWM COMPARATOR
RAMP
GENERATOR
BOOST DRIVER
LOW-SIDE DRIVER
SINK
CURRENT-LIMIT COMPARATOR
PGOOD
COMPARATOR
SOURCE
CURRENT-LIMIT COMPARATOR
HIGH- SIDE DRIVER
PWM
PWM
CONTROL
LOGIC
RAMP
GATEP
HICCUP TIMEOUT
HICCUP
HICCUP
V
CC
LIM1/20 LIM1/10
HICCUP
TIMEOUT
COMP1 BST1 DH1 LX1 DL1 PGND1 FB1 PGOOD1