RT6246B
Ordering Information
RT6246B
Package Type
QUF : UQFN-12HL 3x3 (FC) (U-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup
PWM Operation Mode
B : Forced-PWM
Note :
Richtek products are :
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Pin Configuration
(TOP VIEW)
AGND
PGOOD
8
7
6
5
ILMT
12 11 10
BOOT
LX
NC
VCC
9
BYP
FB
1
2
EN
VIN
PGND
4
3
UQFN-12HL 3x3
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.
Marking Information
MF= : Product Code
�½
MF=YM
DNN
YMDNN : Date Code
Functional Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin Name
BOOT
LX
NC
PGND
VIN
EN
PGOOD
AGND
VCC
FB
Pin Function
Boot-strap pin. Supply high side gate driver. Decouple this pin to LX pin with
0.1F ceramic cap.
Inductor pin. Connect this pin to the switching node of inductor.
No internal connection.
Power ground.
Input pin. Decouple this pin to GND pin with at least 10F ceramic cap.
Enable control. Pull this pin high to turn on the Buck. Do not leave this pin
floating.
Power good Indicator. Open drain output when the output voltage is within 90%
to 120% of regulation point.
Analog ground. Connect AGND to a clean inner GND point with separate trace.
5V linear regulator output for internal control circuit. A capacitor (typical 1F)
should be connected to PGND. Don’t connect to external Load.
Output feedback pin. Connect this pin to the center point of the output resistor
divider to program the output voltage.
Bypass input for the internal LDO. BYP is externally connected to the output of
switching regulator. When the BYP voltage rises above the bypass switch
turn-on threshold, the LDO regulator shuts down and the VCC pin is connected
to the BYP pin through an internal switch. But when BYP pin is not used, it
should be connected to ground.
Current limit setting pin. The current limit is set to 4A, 6A or 8A when this pin is
pull low, floating or pull high respectively.
is a registered trademark of Richtek Technology Corporation.
11
BYP
12
ILMT
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
DS6246B-01 March 2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
