- 您現(xiàn)在的位置：買賣IC網(wǎng) > Datasheet目錄42 > LTC4280CUFD#PBF (Linear Technology)IC CONTROLLER HOT SWAP QFN-24 Datasheet資料下載
參數(shù)資料
| 型號： | LTC4280CUFD#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 291K |
| 描述： | IC CONTROLLER HOT SWAP QFN-24 |
| 標(biāo)準(zhǔn)包裝： | 73 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無 |
| 電源電壓： | 2.9 V ~ 15 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 24-QFN（5x4） |
| 包裝： | 管件 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁當(dāng)前第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
LTC4280
13
4280f
APPLICATIONS INFORMATION
A typical LTC4280 application is in a high availability system
in which a positive voltage supply is distributed to power
individual cards. The device measures card voltages and
currents and records past and present fault conditions.
The system queries each LTC4280 over the I
2
C periodically
and reads status and measurement information.
A basic LTC4280 application circuit is shown in Figure 1.
The following sections cover turn-on, turn-off and various
faults that the LTC4280 detects and acts upon. External
component selection is discussed in detail in the Design
Example section.
Turn-On Sequence
The power supply on a board is controlled by using
an external N-channel pass transistor (Q1) placed in
the power path. Note that resistor R
S
provides current
detection. Resistors R1, R2 and R3 de ne undervoltage and
overvoltage levels. R5 prevents high frequency oscillations
in Q1 and R6 and C1 form an optional network that may
be used to provide an output dV/dt limited start-up.
Several conditions must be present before the external
MOSFET turns on. First the external supply, V
DD
, must
exceed its 2.84V undervoltage lockout level. Next the
internally generated supply, INTV
CC
, must cross its 2.64V
undervoltage threshold. This generates a 60約 to 120約
power-on-reset pulse. During reset the fault registers are
cleared and the control registers are set or cleared as
described in the register section.
After a power-on-reset pulse, the LTC4280 goes through
the following turn-on sequence. First the UV and OV pins
indicate that input power is within the acceptable range,
which is indicated by bits C0-C1 in Table 4. Second, the EN
pin is externally pulled low. Finally, all of these conditions
must be satis ed for the duration of 100ms to ensure that
any contact bounce during insertion has ended.
When these initial conditions are satis ed, the ON pin is
checked and its state written to bit A3 in Table 2. If it is
high, the external MOSFET is turned on. If the ON pin is
low, the external MOSFET is turned on when the ON pin is
brought high or if a serial bus turn-on command is sent
by setting bit A3.
The MOSFET is turned on by charging up the GATE with
a 20糀 current source. When the GATE voltage reaches
the MOSFET threshold voltage, the MOSFET begins to
turn on and the SOURCE voltage then follows the GATE
voltage as it increases.
Figure 1. Typical Application
+
R3
3.4K
1%
PLUG-IN
CARD
R2
1.18k
1%
R5
10?/DIV>
RS
0.005?/DIV>
Q1
FDC653N
R7
30.1k
1%
V
OUT
12V
R8
3.57k
1%
4280 F01
C
L
330糉
C
F
0.1糉
R1
34.8k
1%
BACKPLANE
C3
0.1糉
C
TIMER
0.68糉
GND
SCL
ALERT
SDA
12V
R4
100k
Z1
P6KE16A
R6
15k
C1
6.8nF
UV V
DD
SENSE
+
SENSE
LTC4280
GATE
ADR1
ADR2
ADR0
TIMER INTV
CC
GND
SOURCE
OV
ON
SDAI
SDA0
SCL
ALERT
FB
ADIN
GPIO
EN
FILTER
C
F
47nF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4300-1IMS8#TRPBF | IC HOTSWAP 2WIRE BUS BUFFR 8MSOP |
| LTC4300A-2IMS8#TRPBF | IC BUFFER BUS 2WR HOTSWAP 8-MSOP |
| LTC4301IDD | IC BUFFER BUS HOTSWAP 2WR 8DFN |
| LTC4301LIDD#TRPBF | IC BUFFER BUS HOTSWAP 2WR 8DFN |
| LTC4302IMS-1#TRPBF | IC BUFFER 2-WIRE BUS 10-MSOP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4280CUFD-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
| LTC4280CUFD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
| LTC4280IUFD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
| LTC4280IUFD#PBF | 功能描述:IC HOT SWAP CONTROLLER 24-QFN 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) |
| LTC4280IUFD#TRPBF | 功能描述:IC CTLR HOT SWAP I2C MON 24QFN 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) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。