ISL6420 Intersil Corporation, ISL6420 Datasheet - Page 10

• Manufacturer Part Number: ISL6420
• Description: Advanced Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
• Manufacturer: Intersil Corporation

VMSET/MODE - This pin is a dual function pin. Tie this pin to
VCC5 to disable voltage margining. When not tied to VCC5,
this pin serves as VMSET. Connect a resistor from this pin to
ground to set delta for voltage margining. If voltage
margining and external reference tracking mode are not
needed, this pin can be tied directly to ground.
GPIO2 - This is general purpose IO pin for voltage
margining. Refer to Table 2.
Enable Voltage Margining
No Voltage Margining. Normal
operation using internal reference.
REFOUT not used.
No Voltage Margining. Normal
operation with internal reference.
Buffered V
No Voltage Margining. External
reference. Buffered V
V
REFIN
FUNCTION/MODES
REFOUT
= 0.6V.
REFOUT
TABLE 3. VOLTAGE MARGINING/DDR OR TRACKING SUPPLY PIN CONFIGURATION
=
10
Pin Connected
to GND with
resistor. It is
used as VMSET.
Pin Connected
to GND with
resistor. It is
used as VMSET
VMSET/MODE
H
H
Connect a 1µF
capacitor for
bypass of external
reference.
Connect a 1µF
capacitor for
bypass of external
reference.
Connect a 2.2µF
capacitor to GND.
Connect a 2.2µF
capacitor to GND.
REFOUT
PIN CONFIGURATIONS
ISL6420
Serves as a general
purpose I/O. Refer to
Table 2
Connect to an
external reference
voltage source (0.6V
to 1.25V)
GPIO1/REFIN
TABLE 2. VOLTAGE MARGINING CONTROLLED BY GPIO1
H
L
GPIO1
H
H
L
L
AND GPIO2
Serves as a
general purpose
I/O. Refer to
Table 2
GPIO2
L
L
L
GPIO2
H
H
L
L
REFIN or REFOUT functions
will not be available in this
mode. The internal 0.6V
reference is used.
COMMENTS
+ Delta VOUT
- Delta VOUT
No Change
Ignored
VOUT