ISL6265C_10 Datasheet, PDF (5/27 Pages) Intersil Corporation – Multi-Output Controller with Integrated MOSFET Drivers for AMD SVI Capable Mobile CPUs

ISL6265C
Pin Descriptions (Continued)
PIN(s)
34, 26
35, 25
36
37
38
39
40
41
43, 42
44
45
46
47
48
-
SYMBOL(s)
DESCRIPTION
UGATE0, UGATE1 Connect these pins to the corresponding upper MOSFET gate(s). These pins control the
upper MOSFET gate(s) and are monitored for shoot-through prevention.
BOOT0, BOOT1
These pins provide the bias voltage for the corresponding upper MOSFET drives. Connect
these pins to appropriately chosen external bootstrap capacitors. Internal bootstrap
diodes connected to the PVCC pin provide the necessary bootstrap charge.
BOOT_NB
This pin is the upper gate drive supply voltage for the Northbridge controller. Connect an
appropriately sized ceramic bootstrap capacitor between the BOOT_NB and PHASE_NB
pins. An internal bootstrap diode connected to the PVCC pin provides the necessary
bootstrap charge.
UGATE_NB
Upper MOSFET gate signal from Northbridge controller.
PHASE_NB
Switch node of the Northbridge controller. This pin should connect to the source of the
Northbridge channel upper MOSFET(s).
LGATE_NB
Lower MOSFET gate signal from Northbridge controller.
PGND_NB
The return path of the Northbridge controller lower gate driver. Connect this pin to the
source of the lower MOSFET(s).
OCSET_NB
Overcurrent protection selection input for the Northbridge controller. A resistor from this
pin to PHASE_NB sets the OC trip point.
VSEN_NB, RTN_NB Remote Northbridge voltage sense input and return. Connect isolated traces from these
pins to the Northbridge sense points of the processor.
FSET_NB
A resistor from this pin to GND programs the switching frequency of the Northbridge
controller (for example, 22.1k ~ 260kHz).
COMP_NB
This pin is the output of the Northbridge controller error amplifier.
FB_NB
This pin is the output voltage feedback to the inverting input of the Northbridge controller
error amplifier.
VCC
The bias supply for the IC’s control circuitry. Connect this pin to a +5V supply and
decouple using a quality 0.1µF ceramic capacitor.
VIN
Battery supply voltage. It is used for input voltage feed-forward to improve the input line
transient performance.
GND
The bias and reference ground for the IC. The GND connection for the ISL6265C is
through the thermal pad on the bottom of the package.
5
FN6976.1
July 28, 2010