RT6238A/B
Functional Pin Description
Pin No.
1
2
3
4
5
6
7, 8
9, 10, 11, 12
Pin Name
AGND
FB
PVCC
PGOOD
BOOT
SW
VIN
GND
Analog GND.
Feedback Voltage Input. It is used to regulate the output of the converter to a set
value via an external resistive voltage divider. The feedback reference voltage is
0.7V typically.
Internal Regulator Output. Connect a 1F capacitor to GND to stabilize output
voltage.
Power Good Indicator Open-Drain Output.
Bootstrap Supply for High-Side Gate Driver. This capacitor is needed to drive the
power switch's gate above the supply voltage. It is connected between the SW and
BOOT pins to form a floating supply across the power switch driver. A 0.1F
capacitor is recommended for use.
Switch Node. Connect this pin to an external L-C filter.
Power Input. The input voltage range is from 4.5V to 18V. Must bypass with a
suitably large (10F x 2) ceramic capacitor.
Ground.
Enable Control Input. A logic-high enables the converter; a logic-low forces the IC
into shutdown mode reducing the supply current to less than 10A. The EN pin
can be connected to VIN with a 100k pull-up resistor for automatic start-up. The
pull-up resistance should not small than 60k to prevent EN pin voltage over than
absolute maximum rating.
Soft-Start Time Setting. An external capacitor should be connected between this
pin and GND.
Pin Function
13
EN
14
SS
Function Block Diagram
PVCC
V
IN
Reg
VIBIAS
BOOT
PVCC
Min.
Off
V
REF
Control
Driver
LGATE
PVCC
UGATE
SW
GND
VIN
OC
UV & OV
PVCC
6µA
SS
FB
0.4
EN
5k
3V
-
+
GND SW
SW
Ripple
Gen.
+
+
-
0.9 V
REF
FB
V
IN
Comparator
1.2/1.01
-
+
On-Time
SW
Comparator
+
-
PGOOD
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6238A/B-08 July 2017
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
