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LTC2925 Datasheet

  • LTC2925

  • Quad Power Supply Sequencer

  • 190.70KB

  • 16頁(yè)

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FEATURES
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LTC2924
Quad Power Supply
Sequencer
DESCRIPTIO
The LTC
廬
2924 is a power supply sequencer designed for
use with external N-channel MOSFETs or power supplies
with shutdown pins. Four power supplies can be fully
sequenced by a single LTC2924 and up to five supplies can
be sequenced to a sixth master supply. The LTC2924
requires a minimum of external components, using only
two feedback resistors per sequenced power supply and
a single resistor to set hysteresis.
An internally regulated charge pump provides gate drive
voltages for external logic and sub-logic-level MOSFETs.
Adding a single capacitor enables an adjustable time delay
between power supplies during both Power On and Power
Off sequencing. A second capacitor can be added to enable
a power good timer for detecting the failure of any power
supply to turn on within the selected time. Errors in power
supply sequencing and the control input are detected and
reported at the FAULT output. The LTC2924 features pre-
cision input comparators which can provide 1% accuracy
in monitoring power supply voltages.
Multiple LTC2924s may be easily cascaded to sequence a
virtually unlimited number of power supplies.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Fully Sequence Four Supplies
鈥?Six with Minimal External Circuitry
Cascadable for Additional Supplies
Power Off in Reverse Order or Simultaneously
Charge Pump Drives External MOSFETs
Drives Power Supply Shutdown Pins with No
External Pull-Up Resistors
Sequence and Monitor Two or More Supplies
10碌A(chǔ) Output Current Allows Soft-Starting of Supplies
Done Indicator for Both Power On and Power Off
Adjustable Time Delay Between Power Supplies
Power Good Timer
Power Supply Voltage Monitoring and Power
Sequence Error Detection and Reporting
Available in a 16-Lead Narrow SSOP Package
APPLICATIO S
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Sequenced Power Supplies for ASICs with Multiple
I/O and Core Voltages
Latch-Up Prevention in Systems with Multiple Power
Supplies
TYPICAL APPLICATIO
Q1
1V
0.1碌F
Q2
3V
0.1碌F
Q3
5V
0.1碌F
5V
EARLY
Q4
0.1碌F
Series MOSFET Power Supply Sequencer
5V
V
ON
= 0.93V
V
OFF
= 0.91V
V
ON
= 2.79V
V
OFF
= 2.73V
V
ON
= 4.21V
V
OFF
= 3.76V
V
ON
= 3.32V
V
OFF
= 2.80V
V
CC
OUT1
OUT2
OUT3
10k
10k
OUT4
ON LTC2924
SYSTEM
CONTROLLER
DONE
FAULT
TMR
PGT
150nF
150nF
HYS/CFG
GND
49.9k
Q1-Q4: IRL3714S
ALL RESISTORS 1%
10V/DIV
2V/DIV
2V/DIV
25ms/DIV
2924 TA02c
10V/DIV
2V/DIV
2V/DIV
2924 TA02b
0.1碌F
52.3k
IN1
IN2
IN3
IN4
11.8k
45.3k
6.04k
1.62k
7.68k
1.69k
3.09k
2924 TA02a
U
U
U
Power-Up Sequence
2V/DIV
3.3V
1V
DONE
ON
TMR
25ms/DIV
Power-Down Sequence
5V
2V/DIV
3.3V
1V
DONE
ON
TMR
2924f
1

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