RT6233A/B
Pin Configuration
(TOP VIEW)
BOOT
GND
LX
VIN
1
2
3
4
8
7
6
5
9
SS
PGOOD
EN
FB
WDFN-8L 2x3
Functional Pin Description
Pin No.
1
2,
9 (Exposed Pad)
3
4
5
6
Pin Name
BOOT
GND
LX
VIN
FB
EN
Pin Function
Bootstrap supply for high-side gate driver. Connect a 100nF or greater
capacitor from LX to BOOT to power the high-side switch.
System ground. Provides the ground return path for the control circuitry and
low-side power MOSFET.
Switch node. LX is the switching node that supplies power to the output and
connect the output LC filter from LX to the output load.
Power input. Supplies the power switches of the device.
Feedback voltage input. This pin is used to set the desired output voltage via
an external resistive divider. The feedback voltage is 0.8V typically.
Enable control input. Floating this pin or connecting this pin to GND can
disable the device and connecting this pin to logic high can enable the device.
Power good indicator output. This pin is an open-drain logic output that is
pulled to ground when the output voltage is lower or higher than its specified
threshold under the conditions of OVP, OTP, dropout, EN shutdown, or during
slow start.
Soft-start control input. Connect a capacitor from SS to GND to set the
soft-start period.
7
PGOOD
8
SS
Functional Block Diagram
VIN
6.5K
EN
3V
VEN_
REF
LX
-
+
GND
UVLO
On-
Time
OC
Shutdown
Comparator
Internal
Regulator
VCC
PVCC
BOOT
UGATE
Control
Power
Stage &
Dead-time
Control
LX
UV & OV
Protection
VCC
1µA
SS
FB
Ripple
Gen.
VRef
+
+
-
-
LGATE
MIN OFF
Comparator
VCC
PGOOD
Comparator
VIBIAS
VRef
GND
0.9V
REF
+
PGOOD
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS6233A/B-02
December
2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
