ISL6622 Datasheet, PDF (10/12 Pages) Intersil Corporation – VR11.1 Compatible Synchronous Rectified Buck MOSFET Drivers

ISL6622
components such as lead inductances and PCB
capacitances are also not taken into account. Figure 8
provides a visual reference for this phenomenon and its
potential solution.
UVCC
20kΩ
BOOT
C_BOOT
C_GD
VIN
D
UGATE
G
R_G
C_DS
C_GS
Q_UPPER
S
PHASE
FIGURE 8. GATE TO SOURCE RESISTOR TO REDUCE
UPPER MOSFET MILLER COUPLING
Gate Drive Voltage Options
Intersil provides various gate drive voltage options in the
ISL6622 product family, as shown in Table 2.
The ISL6622 can drop the low-side MOSFET’s gate drive
voltage when operating in DEM, while the high-side FET’s
gate drive voltage of the DFN package can be connected to
VCC or LVCC.
The ISL6622A allows the low-side MOSFET(s) to operate
from an externally-provided rail as low as 5V, eliminating the
LDO losses, while the high-side MOSFET’s gate drive
voltage of the DFN package can be connected to VCC or
LVCC.
The ISL6622B sets the low-side MOSFET’s gate drive
voltage at a fixed, programmable LDO level, while the
high-side FETs’ gate drive voltage of the DFN package can
be connected to VCC or LVCC.
POWER RAILS
ISL6622
SOIC
DFN
ISL6622A
SOIC
DFN
ISL6622B
SOIC
DFN
TABLE 2. ISL6622 FAMILY BIAS OPTIONS
LVCC
PSI = LOW
PSI = HIGH
5.75V
11.2V
Programmable
11.2V
Own Rail
Own Rail
5.75V
Programmable
UVCC
VCC
Own Rail
VCC
Own Rail
VCC
Own Rail
VCC
Operating Voltage Ranges
from 6.8V to 13.2V
10
FN6470.2
October 30, 2008