參數(shù)資料
型號： LTC4260CSW
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, PDSO24
封裝： 0.300 INCH, PLASTIC, SO-24
文件頁數(shù)： 10/28頁
文件大?。?/td> 266K
代理商： LTC4260CSW
LTC4260
10
4260f
OPERATIOU
The Functional Diagram displays the main functional areas
of this device. The LTC4260 is designed to turn a board’s
supply voltage on and off in a controlled manner, allowing
the board to be safely inserted or removed from a live
backplane. During normal operation, the charge pump and
gate driver turn on the external N-channel pass FET’s gate
to pass power to the load. The gate driver uses a charge
pump that derives its power from the SOURCE pin. When
the SOURCE pin is at ground, the charge pump is powered
from an internal 12V supply derived from V
DD
. This results
in a 200
μ
A current load on the SOURCE pin when the gate
is up. Also included in the gate driver is an internal 15V
gate-to-source clamp.
The current sense (CS) amplifier monitors the load current
using the difference between the V
DD
and SENSE pin
voltage. The CS amplifier limits the current in the load by
reducing the GATE-to-SOURCE voltage in an active con-
trol loop. The CS amplifier requires 100
μ
A input bias
current from both the V
DD
and the SENSE pins.
A short circuit on the output to ground causes significant
power dissipation during active current limiting. To limit
this power, the foldback amplifier reduces the current limit
value from 50mV to 20mV (referred to the V
DD
minus
SENSE voltage) in a linear manner as the FB pin drops
below 2V (see Typical Performance curves).
If an overcurrent condition persists, the TIMER pin ramps
up with a 100
μ
A current source until the pin voltage
exceeds 1.2V (comparator TM2). This indicates to the
logic that it is time to turn off the pass FET to prevent
overheating. At this point the TIMER pin ramps down
using the 2
μ
A current source until the voltage drops below
0.2V (comparator TM1) which tells the logic that the pass
transistor has cooled and it is safe to turn it on again.
The output voltage is monitored using the FB pin and the
PG comparator to determine if the power is available for
the load. The power good condition is signalled by the
GPIO pin using an open-drain pull-down transistor. The
GPIO pin can also be used as a general purpose input (GP
comparator) or output pin.
The Functional Diagram shows the monitoring blocks of
the LTC4260. The group of comparators on the left side
includes the UV, OV, RST, BP and ON comparators. These
comparators are used to determine if the external condi-
tions are valid prior to turning on the FET. But first the two
undervoltage lockout circuits UVLO1 and UVLO2 must
validate the input supply and the internally generated 5.5V
supply (INTV
CC
) and generate the power up initialization to
the logic circuits.
Included in the LTC4260 is an 8-bit A/D converter. The
converter has a 3-input mux to select between the ADIN
pin, the SOURCE pin and the V
DD
– SENSE voltage.
An I
2
C interface is provided to read the A/D registers. It
also allows the host to poll the device and determine if
faults have occurred. If the ALERT line is used as an
interrupt, the host can respond to a fault in real time. The
typical SDA line is divided into an SDAI (input) and SDAO
(output). This simplifies applications using an optoisolator
driven directly from the SDAO output. The I
2
C device
address is decoded using the ADR0, ADR1 and ADR2 pins.
These inputs have three states each that decode into a total
of 27 device addresses.
TIW
W
t
SU, DAT
t
SU, STO
t
SU, STA
t
BUF
t
HD, STA
t
SP
t
SP
t
HD, DATO,
t
HD, DATI
t
HD, STA
START
CONDITION
STOP
CONDITION
REPEATED START
CONDITION
START
CONDITION
4260 TD01
SDAI/SDAO
SCL
相關(guān)PDF資料
PDF描述
LTC4260CUH Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4260IGN Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4260ISW Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4260IUH Positive High Voltage Hot Swap Controller with I2C Compatible Monitoring
LTC4300A-1 Hot Swappable 2-Wire Bus Buffers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4260CSW#PBF 功能描述:IC CTLR HOT SWAP I2C 24-SOIC 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)
LTC4260CSW#TRPBF 功能描述:IC HOT SWAP CNTRL I2C 24-SOIC 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)
LTC4260CUH 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 32-Pin QFN EP
LTC4260CUH#PBF 功能描述:IC CTLR HOT SWAP I2C 32-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)
LTC4260CUH#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(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準包裝: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)
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