ISL6125IRZA Intersil, ISL6125IRZA Datasheet - Page 12

• Manufacturer Part Number: ISL6125IRZA
• Description: IC POWER SUPPLY SEQUENCER 24QFN
• Manufacturer: Intersil

Specifications of ISL6125IRZA

• Applications: Power Supply Sequencer
• Voltage - Supply: 1.5 V ~ 5.5 V
• Current - Supply: 200µA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -

between voltages sequencing is set by external capacitance
values, so other than illustrated can be accomplished.
Figures 10 and 11 illustrate the timing relationships between the
EN input, RESET, DLY and GATE outputs and the VOUT
voltage for a single channel being turned on and off
respectively. RESET is not shown in Figure 10 as it asserts
160ms after the last GATE goes high.
All IC family variants share similar function for DLY_X capacitor
charging, GATE and RESET operation. Figures 12 through 15
illustrate the principal feature and functional differences for
each of the ISL6125, ISL6126, ISL6127 and ISL6128 variants.
Figure 12 features the ISL6125 open drain outputs being
sequenced on and off along with RESET relationship, which is
similar to all other family variants.
Figure 13 illustrates the independent input feature of the
ISL6126 which allows once the EN is low for each UVLO to be
individually satisfied and for its associated GATE to turn-on.
Typical Performance Waveforms
1V/DIV
FIGURE 10. ISL6123 SINGLE CHANNEL TURN-ON
ENABLE
EN 2V/DIV
T
FIGURE 8. ISL6124 SEQUENCED TURN-ON
delENLO
5VOUT
2.5VOUT
ISL6123, ISL6124, ISL6125, ISL6126, ISL6127, ISL6128, ISL6130
3.3VOUT
DLY_ON 1V/DIV
12
1.5VOUT
DLY_Vth
3.3VO 1V/DIV
GATE 2V/DIV
40ms/DIV
RESET
10ms/DIV
Only when the last variable VIN is satisfied as shown does the
RESET release to signal all input voltages are valid.
Figure 14 shows the ISL6127 pre-programmed ABCD on
DCBA off order of sequencing with minimal non-adjustable
delay between each.
Figure 15 demonstrates the independence of the redundant
two rail sequencer. It shows that either one of the two groups
can be turned off and the ABCD order of restart with
capacitor programmable delay once both EN inputs are
pulled low.
Using the ISL6125EVAL1Z Platform
The ISL6125EVAL1Z is the ISL6125 specific evaluation
board providing for easy evaluation of the ISL6125 with its
unique open drain outputs. The UVLO levels, sequence and
delays are programmed exactly like the other ISL612X ICs
but the ISL6125 has sequenced open drain outputs rather
than charge pumped driven GATE outputs. See Figure 17 for
its schematic and photograph.
1V/DIV
RESET 2V/DIV
FIGURE 11. ISL6123 SINGLE CHANNEL TURN-OFF
3.3VO 1V/DIV
EN 2V/DIV
GATE 2V/DIV
ENABLE
FIGURE 9. ISL6124 SEQUENCED TURN-OFF
3.3VOUT
1.5VOUT
DLY_OFF 1V/DIV
5VOUT
2.5VOUT
DLY_Vth
4ms/DIV
20ms/DIV
October 15, 2008
FN9005.10