RT7235/36/39/40
Functional Pin Description
Pin No.
Pin Name
TSSOP-14
SOP-8
WDFN-10L 3x3
(Exposed Pad)
(Exposed Pad)
1
--
--
VS
Pin Function
Output Voltage Sense Input.
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 threshold
voltage is 0.765V typically.
Internal Regulator Output. Connect a 1μF capacitor
to GND to stabilize output voltage.
Soft-Start Time Setting. Connect an external capacitor
between this pin and GND to set the soft- start time.
Analog Ground.
Open Drain Power Good Indicator Output.
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 10μA.
Power Ground. The exposed pad must be soldered
to a large PCB and connected to PGND for
maximum power dissipation.
Switch Node. Connect this pin to an external L-C
filter.
Bootstrap Supply for High Side Gate Driver. Connect
a 0.1μF capacitor between the BOOT and SW pin.
Power Input. The input voltage range is from 4.5V to
18V. Must bypass with a suitably large (
≥10μF
x 2)
ceramic capacitor.
Supply Voltage Input for Internal Linear Regulator to
the Control Circuitry.
2
2
2
FB
3
4
5
6
7
3
4
--
5
1
3
4
--
--
1
VREG5
SS
GND
PGOOD
EN
8, 9, 15
11
5, 9
PGND
(Exposed pad) (Exposed pad) (Exposed Pad)
10, 11
12
6, 7
8
6
7
SW
BOOT
13
14
9, 10
--
8
--
VIN
VCC
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7235/36/39/40-00
March 2013
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
