RT7263B
Pin Configurations
(TOP VIEW)
VIN
SW
SW
SW
SW
BOOT
SYNC
1
2
3
4
5
6
7
14
13
GND
15
12
11
10
9
8
AGND
GND
GND
VCC
SS
EN
FB
WDFN-14L 4x3
Function Pin Description
Pin No.
1
Pin Name
VIN
Pin Function
Power Input. VIN supplies the power to the IC, as well as the step-down
converter switches. Drive VIN with a 4.5V to 21V power source. Bypass VIN to
GND with a suitably large capacitor to eliminate noise on the input to the IC.
Switch Node. SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load. Note that a capacitor is
required from SW to BOOT to power the high side switch.
Bootstrap for High Side Gate Driver. Connect a 100nF or greater capacitor from
SW to BOOT to power the high side switch driver.
External Frequency Synchronization Input. Connect an external clock on this pin
changes the switching frequency.
Feedback Input. FB senses the output voltage via an external resistive voltage
divider. The feedback reference voltage is 0.603V typically.
Enable Control Input. Floating this pin or connecting this pin to logic high will
enable the device and connecting this pin to GND will disable the device.
Soft-Start Control Input. Connect a capacitor from SS to GND to set the soft-start
period.
Bias Supply. Decouple with 0.1μF to 0.22μF capacitor between this pin and
GND.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Analog Ground. Connect this pin to the system ground in PCB layout.
2, 3, 4, 5
SW
6
7
8
9
10
11
BOOT
SYNC
FB
EN
SS
VCC
12, 13,
GND
15 (Exposed Pad)
14
AGND
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS7263B-01
September 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
