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参数资料
| 型号： | LTC4280IUFD |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| 封装： | 4 X 5 MM, PLASTIC, MO-220, QFN-24 |
| 文件页数： | 5/28页 |
| 文件大小： | 286K |
| 代理商： | LTC4280IUFD |
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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 I2C 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 RS provides current
detection. Resistors R1, R2 and R3 dene 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, VDD, must
exceed its 2.84V undervoltage lockout level. Next the
internally generated supply, INTVCC, must cross its 2.64V
undervoltage threshold. This generates a 60μs to 120μs
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 satised for the duration of 100ms to ensure that
any contact bounce during insertion has ended.
When these initial conditions are satised, the ON pin is
checked and it’s 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 20μA 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
10Ω
RS
0.005Ω
Q1
FDC653N
R7
30.1k
1%
VOUT
12V
R8
3.57k
1%
4280 F01
CL
330μF
CF
0.1μF
CONNECTOR
2
CONNECTOR
1
R1
34.8k
1%
BACKPLANE
C3
0.1μF
CTIMER
0.68μF
GND
SCL
ALERT
SDA
12V
R4
100k
Z1
P6KE16A
R6
15k
C1
6.8nF
UV VDD SENSE
+
SENSE–
LTC4280
GATE
ADR1 ADR2
ADR0
TIMER INTVCC
GND
SOURCE
OV
ON
SDAI
SDA0
SCL
ALERT
FB
ADIN
GPIO
EN
FILTER
CF
47nF
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4280IUFD#PBF | 功能描述:IC HOT SWAP CONTROLLER 24-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4280IUFD#TRPBF | 功能描述:IC CTLR HOT SWAP I2C MON 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC4280IUFD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
| LTC4280IUFD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
| LTC4280IUFD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Hot Swap Controller with I2C Compatible Monitoring |
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