RT6251A/B
Marking Information
RT6251AHGQW
0L= : Product Code
Pin Configurations
(TOP VIEW)
RT/SYNC
PGOOD
14
13
12
0L=YM
DNN
YMDNN : Date Code
1
RT6251ANGQW
0K= : Product Code
FB
RT6251BHGQW
0J= : Product Code
WQFN-14AL 3.5x3.5
0J=YM
DNN
YMDNN : Date Code
RT6251BNGQW
0H= : Product Code
0H=YM
DNN
YMDNN : Date Code
Functional Pin Description
Pin No.
1
Pin Name
RT/SYNC
Pin Function
Oscillator Resistor and External Frequency Synchronization Input. Connecting a
resistor from this pin to GND sets the switching frequency or connecting an
external clock to this pin changes the switching frequency.
System Ground. Provide the ground return path for the control circuitry and
low-side power MOSFET. The exposed pad must be soldered to a large PCB
and connected to GND for minimum power dissipation.
Power Input. Supplies the power switches of the device.
Supply Voltage Input. Supplies the control circuitry and internal reference of the
device.
Feedback Voltage Input. This pin is used to set the desired output voltage via an
external resistive divider. The feedback reference voltage is 0.8V typically.
Compensation Node. The current comparator threshold increases with this
control voltage. Connect external compensation elements to this pin to stabilize
the control loop.
Soft-Start and Tracking Control Input. Connect a capacitor from SS to GND to
set the soft-start period. The soft-start period can be used to track and sequence
when the external voltage on this pin overrides the internal reference.
Enable Control Input. Floating this pin or connecting this pin to logic high can
enable the device and connecting this pin to GND can disable the device.
is a registered trademark of Richtek Technology Corporation.
2, 3,
GND
15 (Exposed Pad)
4, 5
6
7
8
PVIN
VIN
FB
COMP
9
10
SS/TR
EN
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
DS6251A/B-00 November 2015
COMP
0K=YM
DNN
YMDNN : Date Code
GND
GND
PVIN
PVIN
VIN
2
3
4
5
6
7
15
8
GND
11
10
9
BOOT
LX
LX
EN
SS/TR
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
