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參數(shù)資料
| 型號： | LTC2924CGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Quad Power Supply Sequencer |
| 中文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 190K |
| 代理商： | LTC2924CGN |
LTC2924
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2924f
APPLICATIU
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Fault Detection
The LTC2924 has sophisticated fault detection which can
detect:
Power On and Power Off sequence errors
System controller command errors
Power On timeout failure (with the power good timer
enabled)
Externally commanded faults (FAULT pin pulled low)
If any of the above faults are detected, the LTC2924
immediately pulls the OUT1-OUT4 pins low turning off
all of the power supplies
.
If the fault condition is detected
in one of the supplies controlled by the LTC2924 (an
“internally generated” fault), the FAULT pin is immediately
pulled low indicating the fault condition.
Clearing the Fault Condition
In order to clear the fault condition within the LTC2924, the
following conditions must exist:
All four IN pins must be below 0.61V
The ON pin must be below 0.61V
In the case of an externally generated fault, the FAULT
pin must not be pulled down.
Fault Condition Indicator
If the LTC2924 receives a commanded fault (a cascaded
LTC2924 or an external source pulls down on the FAULT
pin) the LTC2924 will pull the TMR pin low. If the LTC2924
has detected the fault itself (from its internal fault detec-
tion circuits) it will indicate so by raising the TMR pin to
V
CC
. This internal/external fault indicator can be especially
helpful while searching for the source of a fault condition
when multiple LTC2924s are cascaded.
If a fault occurs when the ON pin is high, the fault status
indication on the TMR pin will remain valid until the ON pin
goes low.
Note that the TMR pin may take a while to reach the V
CC
voltage. The pin is pulled to V
CC
with the same 5
μ
A current
source used for the TMR function. The larger the timer
capacitor, the longer this will take. To estimate the amount
of time required for the TMR pin to reach V
CC
in a fault
condition, multiply the normal timer duration by V
CC
(in
Volts). See Figures 7 and 8 for FAULT pin connections
when two or more LTC2924 chips are cascaded.
Sequence Errors
The LTC2924 keeps track of power supplies that should be
on during the Power On sequence and the Power Off
sequence. The LTC2924 also monitors each IN pin after all
of the power supplies have sequenced on. If a power
supply (as monitored at the IN1-IN4 pins) goes low when
it should be high, a fault condition is detected. All four OUT
pins are pulled low and the FAULT pin will be pulled low.
The precision voltage threshold for detection of a se-
quence error at any of the IN1-IN4 pins is the same as the
normal threshold (~0.61V). The precision voltage com-
parators used in the LTC2924 employ a sampled tech-
nique to improve accuracy. The sample time is
approximately 20
μ
s. To improve the speed of detection for
a sequence error, a second high speed comparator is used
for detecting a low power supply. The voltage threshold for
the high speed comparators is approximately 0.4V
(V
ON(FAULT)
). Voltages sensed below this threshold when
a power supply should be ON will cause a fault in ~1
μ
s.
System Controller ON Command Errors
Once the LTC2924 receives the Power On command via
the ON pin, the ON pin must remain above 0.61V until the
Power On sequence has completed (e.g. DONE is as-
serted). Removing the ON command before the LTC2924
Power On sequence has completed is considered a fault
condition. All of the OUT1-OUT4 pins that are already high
will be pulled low and the FAULT pin will be pulled low.
The same is true for the Power Off sequence. If the
LTC2924 has completed the Power On sequence and the
ON pin goes low, the ON pin must remain below 0.61V until
the Power Off sequence has completed. Raising the ON pin
above 0.61V before the Power Off sequence has com-
pleted is considered a fault condition. Any OUTnpins that
are still high will immediately be pulled low and the FAULT
pin will be pulled low.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2924CGN#PBF | 功能描述:IC POWER SUPPLY SEQUENCER 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC2924CGN#TRPBF | 功能描述:IC POWER SUPPLY SEQUENCER 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC2924CGNPBF | 制造商:Linear Technology 功能描述:Power Supply On/Off Sequencer LTC2924CGN |
| LTC2924IGN | 制造商:Linear Technology 功能描述:Volt Supervisor Sequencer 3V to 6V 16-Pin SSOP N |
| LTC2924IGN#PBF | 功能描述:IC POWER SUPPLY SEQUENCER 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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