RT6224D
Marking Information
1X= : Product Code
1X=DNN
DNN : Date Code
Functional Pin Description
Pin No.
Pin Name
BOOT
GND
Pin Function
Bootstrap supply for high-side gate driver. Connect a 0.1F ceramic capacitor
1
2
3
between the BOOT and SW pins.
Power ground.
Feedback voltage input. The pin is used to set the output voltage of the converter
via a resistive divider. The converter regulates VFB to 0.6V.
FB
Enable control input. Connect EN to a logic-high voltage to enable the IC or to a
logic-low voltage to disable. Do not leave this high impedance input unconnected.
4
EN
Power input. The input voltage range is from 4.3V to 18V. Must bypass with a
suitable large ceramic capacitor at this pin.
5
6
VIN
SW
Switch node. Connected to external L-C filter.
Functional Block Diagram
VIN
BOOT
VIN
Reg
V
CC
Min off
Control
VIBIAS
V
REF
V
CC
UGATE
LGATE
OC
UV
SW
Driver
GND
V
CC
Ripple
Gen.
GND SW
VIN
SW
+
+
-
EN
EN
On-Time
SW
Comparator
FB
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is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS6224D-01 August 2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
