ISL6128 Intersil Corporation, ISL6128 Datasheet - Page 18

• Manufacturer Part Number: ISL6128
• Description: (ISL6123 - ISL6130) Power Sequencing Controllers
• Manufacturer: Intersil Corporation

Voltage Tracking
In some applications the various voltages may have to track
each other as they ramp up and down, whereas others may
just need sequencing. In these cases tracking can be
accomplished and has been demonstrated over a wide
range of load current (1A to 10A) and load capacitance
(10µF to 3300µF) with the ISL612X family. Figure 20 and
Figure 21 illustrate output voltage ramping tracking
performance, note that differences are less than 0.5V. With
the relevant GATE pins tied together in a star pattern, so that
the resistance between any two GATE pins is equivalent (1k
to 10k) results in a sharing of the GATE ramping voltage and
with the same or similar enough FETs this behavior is
observed.
It is suggested that this circuit implementation be prototyped
and evaluated for the particular expected loads prior to
committing to manufacturing build.
SUPPLY
ENABLE
POWER
FIGURE 19. MULTIPLE ISL612X SERIAL CONFIGURATION
ISL6123, ISL6124, ISL6125, ISL6126, ISL6127, ISL6128, ISL6130
UVLO
ENABLE#
18
SYSRST#
RESET#
UVLO
SYSRST#
ISL6125
RESET#
ISL6124
# N
RESET#
RESET#
ENABLE#
# N+1
L
O
G
I
C
G
A
T
E
OE
LOW = RESET
TO LOGIC
INPUT
FIGURE 20. OUTPUT VOLTAGE ON LOW TO HIGH TRACKING
FIGURE 21. OUTPUT VOLTAGE HIGH TO LOW TRACKING
February 5, 2007
FN9005.8