RT7256B
Function Block Diagram
VIN
Internal
Regulator
Shutdown
VA V
CC
Comparator
1.2V
+
-
Lockout
Comparator
-
2.5V +
V
CC
6µA
SS
0.8V
+
+EA
-
0.4V
Oscillator
Foldback
Control
+
-
UV
Comparator
Current Sense
Amplifier
Slope Comp
+
-
R
SENSE
VA
BOOT
S
+
-
Current
Comparator
R
Q
Q
110m
Ω
5k
EN
SW
90m
Ω
GND
300k
10k
35p
FB
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7256B-00
February 2012
www.richtek.com
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