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參數(shù)資料
| 型號： | LTC4260IUH |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封裝： | 5 X 5 MM, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 266K |
| 代理商： | LTC4260IUH |
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LTC4260
11
4260f
APPLICATIOU
W
U
U
The typical LTC4260 application is in a high availability
system that uses a positive voltage supply to distribute
power to individual cards. The device measures card
voltages and currents and records past and present fault
conditions. The system queries each LTC4260 over the I
2
C
periodically and reads the stored information.
The basic LTC4260 application circuit is shown in Fig-
ure 1. External component selection is discussed in detail
in the Design Example section.
Turn-On Sequence
The power supply on a board is controlled by placing an
external N-channel pass transistor (Q1) in the power path.
Note that sense resistor (R
S
) detects current and capacitor
C1 controls the GATE slew rate. Resistor R6 compensates
the current control loop while R5 prevents high frequency
oscillations in Q1. Resistors R1, R2 and R3 provide
undervoltage and overvoltage sensing.
Several conditions must be present before the external
switch can be turned on. First the external supply V
DD
must exceed its undervoltage lockout level. Next the
internally generated supply INTV
CC
must cross its 4.5V
undervoltage threshold. This generates a 60
μ
s to 120
μ
s
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 the power-on-reset pulse, the LTC4260 will go
through the following turn-on sequence. First, the UV and
OV pins must indicate that the input power is within the
acceptable range and the BD_PRST pin must be pulled
low. All of these conditions must be satisfied for duration
of 100ms to ensure that any contact bounce during
insertion has ended.
When these initial conditions are satisfied, the ON pin is
checked. If it is high, the external switch turns on. If it is low,
the external switch turns on when the ON pin is brought high
or if a serial bus turn-on command is received.
The switch is turned on by charging up the GATE with a
18
μ
A current source (Figure 2). The voltage at the GATE
pin rises with a slope equal to 18
μ
A/C1 and the supply
inrush current is set at:
I
C
C
A
INRUSH
L
1
=
μ
18
When the GATE voltage reaches the FET threshold voltage,
the switch begins to turn on and the SOURCE voltage
follows the GATE voltage as it increases.
16
UV
R3
2.67k
1%
R2
1.74k
1%
5
7
9
4
2
1
24
23
18
13
20
14
12
10
8
11
R1
49.9k
1%
Z1*
SMBT70A
V
DD
SENSE
LTC4260GN
R6
100k
Q1
FDB3632
R
S
0.010
V
IN
48V
R5
10
C1
6.8nF
C
L
330
μ
F
R7
43.5k
1%
R8
3.57k
1%
V
OUT
48V
R4
100k
C
F
0.1
μ
F
GATE
INTV
CC
ADR0 ADR1
19
C3
0.1
μ
F
NC
ADR2 GND
17
FB
BD_PRST
TIMER
ADIN
GPIO
4260 F01
SOURCE
OV
ON
SDAI
SDA0
SCL
ALERT
15
6
+
C
68nF
*DIODES, INC
BACKPLANE PLUG-IN
CARD
SDA
SCL
ALERT
GND
C
C
Figure 1. 5A, 48V Card Resident Application
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4260IUH#PBF | 功能描述:IC HOT SWAP CNTRL I2C 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用: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 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4260IUH#TRPBF | 功能描述:IC HOT SWAP CNTRL I2C 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用: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 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4261 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring |
| LTC4261CGN | 功能描述:IC CTRLR HOTSWAP W/ADC 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用: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 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
| LTC4261CGN#PBF | 功能描述:IC CTRLR HOTSWAP W/ADC 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:119 系列:- 類型:熱交換控制器 應用: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 供應商設備封裝:80-TQFP（12x12） 包裝:托盤 產(chǎn)品目錄頁面:1423 (CN2011-ZH PDF) |
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