EVAL-ADM1087EBZ Analog Devices Inc, EVAL-ADM1087EBZ Datasheet - Page 3

• Manufacturer Part Number: EVAL-ADM1087EBZ
• Description: BOARD EVALUATION FOR ADM1087
• Manufacturer: Analog Devices Inc
• Series: Simple Sequencers®r

Specifications of EVAL-ADM1087EBZ

• Main Purpose: Power Management, Power Supply Supervisor/Tracker/Sequencer
• Embedded: No
• Utilized Ic / Part: ADM1087
• Primary Attributes: 2 Single Channel Sequencers, Time Based Sequencing
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -

POWER-UP/POWER-DOWN WAVEFORMS
Figure 2 shows the LDO output sequence when battery power is
applied and removed. Channel 1 is the 9 V power signal, which
is switched on and off via the S1 switch. Channels 2, 3, and 4 are
the 3.3 V, 2.5 V, and 1.8 V ADP3334 LDO outputs, respectively.
When the 9 V supply is switched on, the 3.3 V, 2.5 V, and 1.8 V
supplies power up in sequence, with 4.7 nF external capacitors
used to give delays of 22.5 ms between the enabling of the
respective LDOs.
The relationship between the size of the external capacitance
and the duration of the enable time delay is given by the
following formula:
t
EN
= (C × 4.8 × 10
6
) + 35 µs
Rev. Pr0 | Page 3 of 8
1
3
4
2
CH3 5.00V
CH1
5.00V
CH2 5.00V
CH4 5.00V
Figure 2. Sequenced Waveforms
M25.0ms
EVAL-ADM1087EB
CH1
5.7V