RT7259
Ordering Information
RT7259
Package Type
QW : WDFN-14L 4x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
FB
PGOOD
EN/SYNC
VIN
VIN
VIN
NC
Marking Information
14= : Product Code
14=YM
DNN
YMDNN : Date Code
Pin Configurations
(TOP VIEW)
1
2
3
4
5
6
7
14
13
12
GND
15
11
10
9
8
GND
BG
VCC
BOOT
SW
SW
SW
WDFN-14L 4x3
Functional Pin Description
Pin No.
1
Pin Name
FB
Pin Function
Feedback Input. 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 divider. The feedback reference voltage is 0.808V typically.
Power Good Indicator with Open Drain. A 100kΩ pull-high resistor is needed.
The output of this pin is pulled to low when the FB is lower than 0.75V; otherwise
it is high impedance.
Enable or External Frequency Synchronization Input. A logic-high (2V < EN <
5.5V) enables the converter; a logic-low forces the IC into shutdown mode
reducing the supply current to less than 3μA. For external frequency
synchronization operation, the available frequency range is from 300kHz to
1.5MHz.
Power Input. The available input voltage range is from 4.5V to 24V. A 22μF or
larger input capacitor is needed to reduce voltage spikes at the input.
No Internal Connection.
Switching Node. Output of the internal high side MOSFET. Connect this pin to
external low side N-MOSFET, inductor and bootstrap capacitor.
Bootstrap for High side Gate Driver. Connect a 1μF ceramic capacitor between
the BOOT pin and SW pin.
BG Driver Bias Supply. Decouple with a 1μF X5R/X7R ceramic capacitor
between the VCC pin and GND.
Gate Driver Output. Connect this pin to the gate of the external low side
N-MOSFET.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum thermal dissipation.
2
PGOOD
3
EN/SYNC
4, 5, 6
7
8, 9, 10
11
12
13
VIN
NC
SW
BOOT
VCC
BG
14,
GND
15 (Exposed Pad)
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS7259-00 January 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
