RT7273
Function Block Diagram
Whole Chip Function Block Diagram
VINR
Internal
Regulator
PVCC
VCC
BOOT1
CH 1
Step-Down
Converter
LX1
FB1
COMP1
ROSC
SYNC
VIN2
EN2
RLIM2
SS2
LOWP
GND
VIN3
EN3
RLIM3
SS3
PGOOD
CH 3
Step-Down
Converter
Power Good
OSC
VCC PVCC
BOOT2
CH 2
Step-Down
Converter
LX2
FB2
COMP2
VCC PVCC
BOOT3
LX3
FB3
COMP3
VIN1
EN1
RLIM1
SS1
Each Channel Function Block Diagram
VCC
VIN
Slope Comp
+
Oscillator
+
-
R
SENSE
PVCC
BOOT
0.872V
-
PGOOD
Comparator
0.72V
V
CC
6µA
SS
V
CC
1.5µA
EN
5k
+
+
+
-
UV & PGOOD
Comparator
Switch
Controller
SW
0.8V
+
+
EA
-
-
Current
Comparator
GND
OC
3V
1.4V
-
Enable
Comparator
COMP
RLIM
FB
Copyright
©
2014 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS7273-04
October 2014
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
