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ISL6123, ISL6124, ISL6125,
ISL6126, ISL6127, ISL6128
Data Sheet
January 2004
FN9005.2
Power Sequencing Controllers
The Intersil ISL6123, ISL6124, ISL6125, ISL6126, ISL6127,
ISL6128 are integrated 4 channel controlled-on/controlled-off
power-supply sequencers with supply monitoring, fault
protection and a 鈥渟equence completed鈥?signal (RESET#). For
larger systems, more than 4 supplies can be sequenced by
simply connecting a wire between SYSRESET# pins of
cascaded IC's. The ISL6125 uses 4 open-drain outputs to
control the 4 power supplies, and the other sequencers use a
patented, micropower 7X chargepump to drive 4 external low-
cost NFET switch gates above the supply rail by 5.3V. These
IC's can be biased from any supply 5V down to 1.5V. Individual
product descriptions are below.
The four channel
ISL6123
(ENABLE input),
ISL6124
(ENABLE#
input) and
ISL6125
ICs offer the designer 4 rail 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
ISL6123
has a low power standby mode when it
is disabled, suitable for battery powered applications.
The
ISL6125
operates like the
ISL6124
but instead of charge
pump driven gate drive outputs it has open drain logic outputs
for direct interface to other circuitry.
In contrast to the ISL6123 and ISL6124, with the
ISL6126,
each
of the four channels operates independently so that the various
rails will turn on once its individual input voltage requirements
are met.
The
ISL6127
is a preprogrammed A-B-C-D turn-on and D-C-B-A
turn-off sequenced IC. Once all inputs are in compliance and
ENABLE is asserted the sequencing starts and each subsequent
GATE will turn-on after the previous one completes turning-on.
The
ISL6128
has two groups of two channels each with its
independent I/O and is ideal for voltage sequencing into
redundant capability loads as all four inputs need to be satisfied
prior to turn on but a single group fault is ignored by the other
group.
External resistors provide flexible voltage threshold programming
of monitored rail voltages. Delay and sequencing are provided by
external capacitors for both ramp up and ramp down.
Additional I/O is provided indicating and driving RESET state in
various configurations.
For volume applications, other programmable options and
features can be had. Contact the factory with your needs.
Features
鈥?Enables arbitrary turn-on and turn-off sequencing of up to
four power supplies (0.7V - 5V)
鈥?Operates from 1.5V to 5V supply voltage
鈥?Supplies V
DD
+5.3V of charge pumped gate drive
鈥?Adjustable voltage slew rate for each rail
鈥?Multiple sequencers can be daisy-chained to sequence an
infinite number of independent supplies
鈥?Glitch immunity
鈥?Under voltage lockout for each supply
鈥?1碌A Sleep State (ISL6123)
鈥?Active high (ISL6123) or low (ISL6124) ENABLE# input
鈥?Open drain version available (ISL6125)
鈥?Pre programmed Sequence available (ISL6127)
鈥?Dual channel groupings (ISL6128)
鈥?QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
Applications
鈥?Graphics cards
鈥?FPGA/ASIC/microprocessor/PowerPC supply sequencing
鈥?Network routers
鈥?Telecommunications systems
AIN
BIN
CIN
DIN
AOUT
BOUT
COUT
DOUT
GATE D
GATE C
GATE B
GATE A
DIN
CIN
BIN
V
DD
ENABLE
SYSRST#
UVLO_A
UVLO_B
UVLO_C
UVLO_D
DLY_OFF_B
DLY_OFF_C
DLY_OFF_D
Ordering Information
PART NUMBER
ISL6123IR
ISL6124IR
ISL6125IR
ISL6126IR
ISL6127IR
ISL6128IR
ISL612XSEQEVAL1
TEMP. RANGE (
o
C)
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
-40 to +85
PACKAGE
PKG. DWG. #
24 Ld 4x4 QFN L24.4x4
24 Ld 4x4 QFN L24.4x4
24 Ld 4x4 QFN L24.4x4
24 Ld 4x4 QFN L24.4x4
24 Ld 4x4 QFN L24.4x4
24 Ld 4x4 QFN L24.4x4
Evaluation Platform
RESET#
GROUND
DLY_OFF_A
DLY_ON_A
DLY_ON_B
DLY_ON_C
FIGURE 1. TYPICAL ISL6123 APPLICATION USAGE
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2004 All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
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