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參數(shù)資料
| 型號(hào)： | LTC4221IGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 16/28頁 |
| 文件大小： | 272K |
| 描述： | IC CTRLR HOTSWAP DUAL 16SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 1 V ~ 13.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
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16
LTC4221
4221fa
ON1 clears its off threshold and the initial timing cycle is
complete, the GATE1 pin is pulled up by a 9.5糀 current
source connected to the charge pump output during the
channel start-up cycle. GATE1 can be servoed by adjusting
the ramp up current to <9.5糀 to control the inrush
current to the load during start-up. ON2 controls GATE2 in
a similar manner but is overwritten by ON1s global reset
function. During an overcurrent fault condition that sets
the fault latch, both GATE pins are pulled down by their
respective internal N-channel MOSFET pull-downs.
During hot insertion of the PCB, an abrupt application of
supply voltage charges the external MOSFET drain/gate
capacitance. This can cause an unwanted gate voltage
spike. An internal proprietary circuit holds both GATE pins
low before the internal circuitry wakes up. This reduces the
MOSFET current surges substantially at insertion.
Electronic Circuit Breaker
The LTC4221 features an electronic circuit breaker func-
tion that protects against supply overvoltage, externally
generated fault conditions and shorts or excessive load
current conditions on any of the supplies. If the circuit
breaker trips, both GATE pins are immediately pulled to
ground, the external N-channel MOSFETs are quickly
turned OFF and FAULT is latched low.
During the normal cycle, a supply overvoltage on channeln
propagates via the V
OUTn
resistive dividers to the FBn pin.
A supply overvoltage high enough to pull either FB pin
above 0.822V for more than 18約 will trip the circuit
breaker.
The circuit breaker can also be made to trip by externally
forcing the bidirectional FAULT pin below 0.816V. The
FAULT pin has 35mV of hysteresis. An internal glitch filter
of 15約 filters out noise on the FAULT pin.
The slow comparator of channeln trips the circuit breaker
if V
RSENSEn
= (V
CCn
V
SENSEn
) is greater than its 25mV
threshold for more than 15約. There may be applications
where this inherent response time is not long enough, for
example, because of excessive supply voltage noise. To
adjust the response time of the slow comparator, a capaci-
tor can be connected from the FILTER pin to GND. If this
pin is left unused, each slow comparators delay defaults
to 15約. During normal operation, the FILTER output pin
is held low by an internal 1.8糀 pull-down current source.
During an overcurrent condition on either channel as
shown in Figure 6, the 1.8糀 pull-down on the FILTER pin
becomes an internal 105糀 pull-up and C
FILTER
charges
up. Once the FILTER pin voltage ramps past its low-to-
high threshold of 1.24V at time point 2, the electronic
circuit breaker trips and the LTC4221 shuts down. The
FILTER pins internal 1.8糀 pull-down discharges C
FILTER
and holds FILTER low. Each slow comparators response
time from an overcurrent fault condition is:
t
V C
A
s
FILTER
FILTER
=
?/DIV>
+ ?/DIV>
1 24
105
15
.
"
(1)
Intermittent overloads may exceed the current limit as in
Figure 7, but if the duration is sufficiently short, the FILTER
pin may not reach the V
FILTER(TH)
threshold and the
LTC4221 will not shut down. To handle this situation, the
FILTER discharges with 1.8糀 whenever both V
RSENSE
are
below 25mV. Any intermittent overload with an aggregate
APPLICATIO S I FOR ATIO
U
U
U
Figure 7. Multiple Intermittent Overcurrent Condition
A1
B1 A2
B2 A3 B3
~25mV/R
SENSE1
~25mV/R
SENSE2
CIRCUIT BREAKER
TRIPS
1.8糀
1.8糀
4221 F07
1.8糀
105糀
105糀
105糀
I
LOAD1
I
LOAD2
V
FILTER
V
GATE
1.24V
1.8糀
SLOW
COMPARATOR
TRIP
SLOW
COMPARATOR
TRIP
SLOW
COMPARATOR
TRIP
Figure 6. A Continuous Fault Timing
1.24V
1
2
NORMAL
SLOW
COMPARATOR
TRIP
V
FILTER
CIRCUIT BREAKER TRIPS.
GATE1, GATE2 AND
FAULT PULL LOW
1.8糀
1.8糀
4221 F06
1.8糀
105糀
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| LTC4222 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Hot Swap Controller |
| LTC4222_12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Hot Swap Controller |
| LTC4222CG#PBF | 功能描述:IC CTRLR DUAL HOT SWAP 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開關(guān):無 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| LTC4222CG#TRPBF | 功能描述:IC CTRLR DUAL HOT SWAP 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:119 系列:- 類型:熱交換控制器 應(yīng)用:通用型，PCI Express? 內(nèi)部開關(guān):無 電流限制:- 電源電壓:3.3V，12V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:80-TQFP 供應(yīng)商設(shè)備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4222CG-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Hot Swap Controller with I2C Compatible Monitoring |
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