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