F72815
3. Pin Configuration
GND
9
4. Pin Description
Pin No
Pin Name
BOOT
Description
Bootstrap supply pin for the upper gate driver. Connect the bootstrap capacitor between
BOOT pin and the PHASE pin. The bootstrap capacitor provides the charge to turn on
the upper MOSFET.
1
2
3
4
5
UGATE
VREF
LGATE
VCC
Higher gate drive output. Connect this pin to gate of the high side MOSFET
Reference voltage input. The input range is 0.6V~1.8V.
Lower gate drive output. Connect this pin to gate of the low side MOSFET
IC supply voltage. This voltage is monitored for power-on-reset purpose.
Inverting input of the error amplifier used to compensate the feedback loop of the PWM
controller.
6
FB
This is multi-function pin. Connecting a resistor ROCSET from this pin to PHASE, and an
internal 40uA current source from VCC. OCSET voltage can sense loading status when
low side MOSFET turn on. When OCSET voltage is under 0.15V, shut down (SD)
function will be enabled.
7
8
OCSET/SD
PHASE
Connect this pin to the source of the upper MOSFET and the drain of the lower MOSFET.
F72815
-2-
Aug, 2007
V0.14
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
