ISL6123_07 Datasheet, PDF (16/21 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. ISL6125EVAL1 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 Cap. A
5V turn-off Delay Cap. A (135ms)
3.3V turn-on Delay Cap.B (13.7ms)
3.3V turn-off Delay Cap. B (13.7ms)
2.5V turn-on Delay Cap.D (28ms)
2.5V turn-off Delay Cap. D
1.5V turn-on Delay Cap. C (98ms)
1.5V turn-off Delay Cap. C (59ms)
Decoupling Capacitor
RESET#1 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
In order to control the sequencing of more than 4 voltages,
several of the ISL6123, ISL6124, ISL6125 or ISL6127
devices can be variously configured together to accomplish
this. There may be concerns of a particular implementation
that would make a particular configuration preferable over
another. The fundamental questions to answer 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 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 where the integrity of critical voltages must be
assured prior to sequencing, additional monitoring of the
critical supplies is needed. If the compliance of the voltage is
critical for either undervoltage and/or overvoltage, the
ISL613X family of supervisors can be employed to provide
this additional assurance across multiple sequencers. See
document FN9115 for supervisor data sheet. Figure 17 is a
block diagram of this voltage compliant, high assurance, low
risk configuration showing the ISL613X supervisor and a mix
of FET switched outputs and logic output sequencers
(ISL6124 and ISL6125 ICs).
16
FN9005.8
February 5, 2007