RT7274/79/80/81
Functional Pin Description
Pin No.
TSSOP-14
(Exposed Pad)
1
2
3
4
5
6
7
8, 9, 15
(Exposed pad)
10, 11
12
13
14
SOP-8
(Exposed Pad)
--
2
3
4
Pin Name
Pin Function
Output Voltage Sense Input. This terminal is used for On-Time
Adjustment.
Feedback Input Voltage. Connect with feedback resistive
divider to the output voltage.
5.1V Power Supply Output. Connect a 1μF capacitor from this
pin to GND.
Soft-Start Control. Connect an external capacitor between this
pin and GND to set the soft- start time.
Analog Ground. The exposed pad must be soldered to a large
PCB and connected to GND for maximum power dissipation.
Open Drain Power Good Output.
Enable Control Input.
Power Ground. The exposed pad must be soldered to a large
PCB and connected to PGND for maximum power dissipation.
Switch Node.
Bootstrap Supply for High Side Gate Driver. Connect a 0.1μF
capacitor between the BOOT and SW pin.
Power Input. It is connected to the drain of the internal high
side MOSFET.
Supply Input for Internal Linear Regulator to the Control
Circuitry.
VOUT
FB
PVCC
SS
5,
GND
9 (Exposed Pad)
--
1
--
6
7
8
--
PGOOD
EN
PGND
SW
BOOT
VIN
VINR
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7274/79/80/81-01
February 2013
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
