ISL6123_11 Datasheet, PDF (17/23 Pages) Intersil Corporation – Power Sequencing Controllers

ISL6123, ISL6124, ISL6125, ISL6126, ISL6127, ISL6128, ISL6130
COMPONENT
DESIGNATOR
U1
R6
R12
R1
R11
R2
R3
R4
R5
R9
C5
C9
C2
C8
C3
C7
C4
C6
C1
D1
R8
R9
R10
R13
TABLE 3. ISL6125EVAL1Z COMPONENT LISTING
COMPONENT FUNCTION
ISL6125, Four Supply Sequencer
5V to UVLO_A Resistor for Divider String
UVLO_A to GND Resistor for Divider String
3.3V to UVLO_B Resistor for Divider String
UVLO_B to GND Resistor for Divider String
2.5V to UVLO_D Resistor for Divider String
UVLO_D to GND Resistor for Divider String
1.5V to UVLO_C Resistor for Divider String
UVLO_D to GND Resistor for Divider String
RESET LED Current Limiting Resistor
5V turn-on Delay Capacitor A
5V turn-off Delay Capacitor A (135ms)
3.3V turn-on Delay Capacitor B (13.7ms)
3.3V turn-off Delay Capacitor B (13.7ms)
2.5V turn-on Delay Capacitor D (28ms)
2.5V turn-off Delay Capacitor D
1.5V turn-on Delay Capacitor C (98ms)
1.5V turn-off Delay Capacitor C (59ms)
Decoupling Capacitor
RESET1 Indicating LED
SEQ_OUTPUT_A Pull-Up Resistor
SEQ_OUTPUT_B Pull-Up Resistor
SEQ_OUTPUT_C Pull-Up Resistor
SEQ_OUTPUT_D Pull-Up Resistor
COMPONENT DESCRIPTION
Intersil, ISL6125, Four Supply Sequencer with Open Drain Outputs
8.45kΩ 1%, 0402
1.47kΩ 1%, 0402
7.68kΩ 1%, 0402
2.26kΩ 1%, 0402
6.98kΩ 1%, 0402
3.01kΩ 1%, 0402
4.99kΩ 1%, 0402
4.99kΩ 1%, 0402
750Ω 10%, 0805
DNP, 0402
0.1µF 10%, 6.3V, 0402
0.01µF 10%, 6.3V, 0402
0.01µF 10%, 6.3V, 0402
0.022µF 10%, 6.3V, 0402
DNP, 0402
0.068µF 10%, 6.3V, 0402
0.047µF 10%, 6.3V, 0402
0.1µF, 0805
0805, SMD LED
10kΩ, 0402
10kΩ, 0402
10kΩ, 0402
10kΩ, 0402
Application Implementations
Multiple Sequencer Implementations
The ISL6123, ISL6124, ISL6125 and ISL6127 devices can be
configured to control sequencing of more than four voltages. A
particular configuration may be preferable to another, depending
on concerns. The fundamental questions to determine which
configuration is best suited for your applications are:
1. What level of voltage assurance is needed prior to sequencing
on, and can the voltage supplies be grouped into high and low
criticality?
2. Is there a critical maximum time window in which all supplies
must be present at load, or is there a first and a second group
preference, possibly with some work done in between the two
groups of voltages being present?
Three configurations are described and illustrated here.
In applications for which the integrity of critical voltages must be
assured prior to sequencing, additional monitoring of the critical
supplies is needed. If voltage compliance is critical for either
undervoltage or overvoltage, voltage supervisors can be used to
provide this additional assurance across multiple sequencers.
Figure 19 is a block diagram of a voltage-compliant,
high-assurance, low-risk configuration showing the ISL6131 or
ISL6132 supervisor and a mix of FET switched outputs and logic
output sequencers (ISL6124 and ISL6125 ICs).
17
FN9005.11
August 25, 2011