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參數(shù)資料
| 型號(hào)： | LTC2925 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal Bus Transceiver With 3-State Outputs 20-TSSOP -40 to 85 |
| 中文描述： | 四路電源排序器 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 190K |
| 代理商： | LTC2925 |
LTC2924
7
2924f
OPERATIOU
The LTC2924 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 (see Figure 1). An inter-
nally regulated charge pump provides (V
CC
+ 5V) gate
voltages for driving external logic-level 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 to detect the failure of
any power supply to turn on within the set time.
The ON pin is used to command the LTC2924 to start the
Power On and Power Down sequences. To command the
Power On sequence, the ON pin is pulled above 0.61V by
a system controller or a resistive divider from a power
supply. A voltage comparator senses the ON command
and signals the sequencing logic to start the Power On
sequence.
When the Power On sequence starts, the TMR grounding
switch is released and a 5
μ
A current source charges an
external capacitor, C
TMR
(see Figure 2). When the voltage
on this capacitor exceeds 1V, a comparator signals the
DONE
*TMR IS CAPACITOR ADJUSTABLE
0V
ON
TMR*
V
PS2(ON)
V
PS3(ON)
V
PS4(ON)
V
PS1(ON)
PS1
PS3
PS2
PS4
V
PS4(OFF)
V
PS3(OFF)
V
PS2(OFF)
2924 F01
V
PS1(OFF)
Figure 1. Power On and Power Off Sequence for Four Supplies
ON
TMR
OUT1
0.61V
0.61V
1V
OUT2
OUT3
OUT4
IN1
IN2
IN3
IN4
DONE
0.61V
0.61V
0.61V
2924 F02
Figure 2. On Sequence for Four Supplies
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