LTC2924CGN#PBF Linear Technology, LTC2924CGN#PBF Datasheet - Page 12

• Manufacturer Part Number: LTC2924CGN#PBF
• Description: IC POWER SUPPLY SEQUENCER 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC2924CGN#PBF

• Applications: Power Supply Sequencer
• Voltage - Supply: 3 V ~ 6 V
• Current - Supply: 1.5mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Input Voltage: 6V
• Output Current: 10µA
• Output Voltage: 4.5V
• No. Of Outputs: 4
• Supply Voltage Range: 3V To 6V
• No. Of Pins: 16
• Operating Temperature Range: 0°C To +70°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -

LTC2924
APPLICATIO S I FOR ATIO
Cascading Multiple LTC2924s
Two or more LTC2924s may be cascaded to fully sequence
8,12 or more power supplies. Figures 7 and 8 show how
to configure the LTC2924 to sequence 8 and 12 power
supplies. To sequence more power supplies, use the circuit
in Figure 8 and add more LTC2924s in the middle.
Notice that the last LTC2924 in the cascade string must
have a pull-up resistor on the  D  O  N  E pin. Any LTC2924
that is not the first in the cascade string should have the
hysteresis current setting resistor, R
instead of ground. The value of the R
unchanged. The  F  A  U  L  T pins should all be connected to-
gether and pulled up with a single 10k resistor.
Care should be taken when designing a circuit cascading
multiple LTC2924s. Use the following guidelines:
12
R
HYS
ON
U
Figure 7. Cascading Two LTC2924s to Fully Sequence Up to Eight Power Supplies
Figure 8. Cascading Three LTC2924s to Fully Sequence Up to 12 Power Supplies
U
R
HYS
TMR
HYS/CFG
ON
IN1
IN2
IN3
IN4
LTC2924
FAULT
ON
W
DONE
OUT1
OUT2
OUT3
OUT4
GND
PGT
V
HYS
CC
HYS
TMR
HYS/CFG
ON
IN1
IN2
IN3
IN4
resistor remains
, pulled to V
R
LTC2924
HYS
FAULT
V
U
CC
DONE
OUT1
OUT2
OUT3
OUT4
GND
PGT
V
CC
TMR
HYS/CFG
ON
IN1
IN2
IN3
IN4
CC
R
LTC2924
HYS
FAULT
V
CC
DONE
OUT1
OUT2
OUT3
OUT4
• All V
• The ground pins should be connected via a ground
• Cascaded LTC2924s communicate using a combination
GND
PGT
V
CC
chain must be connected to the same power supply.
plane.
of levels and pulses which do not look like the normal
output of a  D  O  N  E pin nor input to an ON pin. Do not
connect any other components to the node between
the  D  O  N  E and ON pins. Keep the parasitic capacitance
on this node below 75pF. Care should be taken when
routing a circuit trace between  D  O  N  E and ON. If pos-
sible, run the trace adjacent to the ground plane, and/or
shield the trace with a ground trace on either side.
Leakage currents must be maintained below 2µA on
this node.
TMR
HYS/CFG
ON
IN1
IN2
IN3
IN4
CC
R
LTC2924
FAULT
HYS
and ground pins for the LTC2924s in the cascade
DONE
OUT1
OUT2
OUT3
OUT4
GND
PGT
V
CC
TMR
HYS/CFG
ON
IN1
IN2
IN3
IN4
LTC2924
V
FAULT
CC
10k
V
2924 F07
CC
DONE
OUT1
OUT2
OUT3
OUT4
10k
GND
PGT
V
CC
DONE
FAULT
V
CC
10k
V
2924 F08
CC
10k
DONE
FAULT
2924fa