RT7248
Ordering Information
RT7248
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
H : UVP Hiccup
N : UVP Disabled
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
BOOT
VIN
SW
GND
2
3
4
Pin Configurations
(TOP VIEW)
8
SS
EN
COMP
FB
GND
9
7
6
5
SOP-8 (Exposed Pad)
Functional Pin Description
Pin No.
1
2
3
4, 9 (Exposed Pad)
Pin Name
BOOT
VIN
SW
GND
Pin Function
Bootstrap for High Side Gate Driver. Connect a 100nF or greater ceramic
capacitor from BOOT to SW pins.
Input Supply Voltage, 4.5V to 18V. Must bypass with a suitable large
ceramic capacitor.
Phase Node. Connect this pin to external L-C filter.
Ground. The exposed pad must be soldered to a large PCB and connected
to GND for maximum power dissipation.
Feedback Input Pin. This pin is connected to the converter output. It is used
to set the output of the converter to regulate to the desired value via an
external resistive voltage divider. For an adjustable output, an external
resistive voltage divider is connected to this pin.
Compensation Node. COMP is used to compensate the regulation control
loop. Connect a series RC network from COMP to GND. In some cases, an
additional capacitor from COMP to GND is required.
Enable Input pin. A logic high enables the converter; a logic low forces the
IC into shutdown mode reducing the supply current to less than 3μA. Attach
this pin to VIN with a 100kΩ pull up resistor for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a
capacitor from SS to GND to set the soft-start period. A 0.1μF capacitor
sets the soft-start period to 15.5ms.
5
FB
6
COMP
7
EN
8
SS
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS7248-01
September 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
