RT6253A/B
Functional Pin Description
Pin No.
Pin
Name
GND
SW
Power ground.
Switch node between the internal switch and the synchronous
rectifier. Connect this pin to the inductor and bootstrap capacitor.
Power input. The input voltage range is from 4.5V to 17V. Connect
input bypass capacitors directly to this pin and GND pins. The
MLCC with capacitance higher than 20F is recommended.
Feedback voltage input. Connect this pin to the midpoint of the
external feedback resistive divider to set the output voltage of the
converter to the desired regulation level. The device regulates the
FB voltage at feedback reference voltage.
Enable control input. Connect this pin to logic high enables the
device and connect this pin to GND disables the device.
Bootstrap capacitor connection node to supply the high-side gate
driver. Connect a 0.1F ceramic capacitor between this pin and the
SW pin.
TSOT-23-6 (FC) SOT-563 (FC)
1
2
3
2
Pin Function
3
1
VIN
4
6
FB
5
6
5
4
EN
BOOT
Functional Block Diagram
VIN
SW
EN
VEN_TH
R
EN_DN
+
-
UVLO
On-
Time
OC
Internal
Regulator
VCC
PVCC
BOOT
UV
Protection
65%
Control
Soft-Start
Ramp
Gen.
+
+
-
Gate Driver &
Dead-Time
Control
SW
FB
Comparator
MIN OFF
GND
Copyright © 2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6253A/B-01
September
2019
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
