ISL8723 Datasheet, PDF (1/14 Pages) Intersil Corporation – Power Sequencing Controllers

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Data Sheet
ISL8723, ISL8724
April 22, 2009
FN6413.1
Power Sequencing Controllers
The Intersil ISL8723 and ISL8724 are 4 channel sequencers
controlling the on and off sequence of voltages with
undervoltage supply fault protection and a “sequence
completed” signal (RESET). For larger systems, more than 4
voltages can be sequenced by a simple connection of
multiple IC's. These sequencers use an integrated charge
pump to drive 4 external low-cost N-channel MOSFET
switch gates above the IC bias voltage by 5.3V. These IC's
can be biased from and control any supply from 2.5V to 5V
and additionally monitor any voltage above 0.7V. Individual
product descriptions follow.
The four channel ISL8723 (ENABLE input), ISL8724
(ENABLE input) offer the designer 4 voltage control when it
is required that all four rails are in minimal compliance prior
to turn on and that compliance must be maintained during
operation. The ISL8723 has a low power standby mode
when it is disabled suitable for battery powered applications.
External resistors provide flexible voltage threshold
programming of monitored voltages. Delay and sequencing
timing are programmable by external capacitors for both
ramp up and ramp down.
Ordering Information
PART NUMBER
(Note)
TEMP.
PART RANGE
MARKING (°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL8723IRZ*
87 23IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4
ISL8724IRZ*
87 24IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4
ISL8723EVAL1
Evaluation Platform
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination finish,
which is RoHS compliant and compatible with both SnPb and Pb-free
soldering operations). Intersil Pb-free products are MSL classified at
Pb-free peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
Features
• Enables arbitrary turn-on and turn-off sequencing of up to
four power supplies (0.7V to 5V)
• Operates from 2.5V to 5V supply voltage
• Supplies V_DD +5.3V of charge pumped gate drive
• Adjustable voltage slew rate for each rail
• Multiple sequencers can be easily daisy-chained to
sequence an infinite number of independent voltages
• Glitch immunity
• Undervoltage lockout for each monitored supply voltage
• 30µA Sleep State (ISL8723)
• Active high (ISL8723) or low (ISL8724) ENABLE input
• Pb-free (RoHS compliant)
Applications
• Graphics cards
• FPGA/ASIC/microprocessor/PowerPC supply sequencing
• Network Routers
• Telecommunications Systems
Pinout
ISL8723, ISL8724
(24 LD QFN)
TOP VIEW
24 23 22 21 20 19
ENABLE/
ENABLE ¹
18 DLY_OFF_A
GATE_A 2
17 UVLO_C
DLY_OFF_C 3
DLY_OFF_D 4
4mmx4mm
16 DLY_ON_C
15 DLY_ON_D
GATE_B 5
14 UVLO_D
GATE_C 6
13 DLY_OFF_B
7 8 9 10 11 12
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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