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3. Pin Configuration
BOOT
UGATE
GND
1
2
3
4
8
7
6
5
PHASE
OCSET
FB
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LGATE
VCC
4. Pin Description
Pin No
Pin Name
BOOT
Description
1
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.
2
3
4
5
6
UGATE
GND
Higher gate drive output. Connect this pin to gate of the high side MOSFET
Power ground pin for the chip
LGATE
VCC
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.
FB
Inverting input of the error amplifier used to compensate the feedback loop of the PWM
controller.
7
OCSET/SD
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 0.1V, shut down (SD) function
will be enabled.
8
PHASE
Connect this pin to the source of the upper MOSFET and the drain of the lower MOSFET.
5. Electrical Characteristic
Absolute Maximum Ratings
PARAMETER
IC supply voltage
PHASE to GND
BOOT to PHASE
SYMBOL
RATINGS
UNIT
VCC
15
15
15
V
V
V
VPHASE – GND
VBOOT - VPHASE
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-2-
V0.23P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
