RT8253A Datasheet, PDF (3/15 Pages) Richtek Technology Corporation – 3A, 23V, 340kHz Synchronous Step-Down Converter

Function Block Diagram
RT8253A
VIN
Internal
Regulator
Oscillator
340kHz / 110kHz
Current Sense
Shutdown
Comparator V_A ^VCC
Foldback
Slope Comp ^Amplifier
+
V_A
1.2V +
Control
-
-
0.4V +
Lockout
5k
Comparator
EN
-
-
UV
Comparator
2.7V ⁺
3V
V_CC
SQ
+
-
RQ
Current
Comparator
85mΩ
85mΩ
BOOT
SW
GND
6µA
SS
0.8V
+
-+EA
FB
COMP
DS8253A-02 March 2011
www.richtek.com
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