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参数资料
| 型号： | LTC4259CGW#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36 |
| 封装： | 0.300 INCH, PLASTIC, SSOP-36 |
| 文件页数： | 31/32页 |
| 文件大小： | 324K |
| 代理商： | LTC4259CGW#PBF |
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LTC4259
8
4259i
UU
U
PI FU CTIO S
SHDN2 (Pin 18): Shutdown Channel 2, Active Low. See
SHDN1.
SHDN3 (Pin 19): Shutdown Channel 3, Active Low. See
SHDN1.
SHDN4 (Pin 20): Shutdown Channel 4, Active Low. See
SHDN1.
AGND (Pin 21): Analog Ground. AGND should be con-
nected to the return from the – 48V supply. AGND and
DGND should typically be tied together. However, if they
are not, AGND can be separated from DGND by no more
than
±100mV.
SENSE4 (Pin 22): Channel 4 Current Sense Input. SENSE4
monitors the external MOSFET current via a 0.5
sense
resistor between SENSE4 and VEE. Whenever the voltage
across the sense resistor exceeds the overcurrent detec-
tion threshold VCUT, the current limit fault timer counts up.
If the voltage across the sense resistor reaches the current
limit threshold VLIM (typically 25mV/50mA higher), the
GATE4 pin voltage is lowered to maintain constant current
in the external MOSFET. See Applications Information for
further details. If the channel is unused, the SENSE4 pin
must be tied to VEE.
GATE4 (Pin 23): Channel 4 Gate Drive. GATE4 should be
connected to the gate of the external channel 4 MOSFET.
When the MOSFET is turned on, a 50
A pull-up current
source is connected to the pin. The gate voltage is clamped
to 13V (typ) above VEE. During a current limit condition,
the voltage at GATE4 will be reduced to maintain constant
current through the external MOSFET. If the fault timer
expires, GATE4 is pulled down with 50
A, turning the
MOSFET off and recording a tICUT or tSTART event. If the
channel is unused, float the GATE4 pin or tie it to VEE.
OUT4 (Pin 24): Channel 4 Output Voltage Monitor. OUT4
should be connected to the output port through a 10k
series resistor. A current limit foldback circuit limits the
power dissipation in the external MOSFET by reducing the
current limit threshold when the output voltage is within
18V of AGND. The port 4 Power Good bit is set when the
voltage from OUT4 to VEE drops below 2V (typ). A 2.5M
resistor is connected internally from OUT4 to AGND. If the
channel is unused, the OUT4 pin can be tied to AGND or
allowed to float.
SENSE3 (Pin 25): Channel 3 Current Sense Input. See
SENSE4.
GATE3 (Pin 26): Channel 3 Gate Drive. See GATE4.
OUT3 (Pin 27): Channel 3 Output Voltage Monitor. See
OUT4.
VEE (Pin 28): – 48V Supply Input. Connect to a – 45.5V to
– 57V supply, relative to AGND.
SENSE2 (Pin 29): Channel 2 Current Sense Input. See
SENSE4.
GATE2 (Pin 30): Channel 2 Gate Drive. See GATE4.
OUT2 (Pin 31): Channel 2 Output Voltage Monitor. See
OUT4.
SENSE1 (Pin 32): Channel 1 Current Sense Input. See
SENSE4.
GATE1 (Pin 33): Channel 1 Gate Drive. See GATE 4.
OUT1 (Pin 34): Channel 1 Output Voltage Monitor. See
OUT4.
AUTO (Pin 35): Auto Mode Input. Auto mode is intended
to allow the LTC4259 to detect and power up a PD even if
there is no host controller present on the I2C bus. When
this pin is high, all Mode bits in the Operating Mode
register will be set at power-up or after a system reset.
When this pin is low, all Mode bits will be cleared at
power-up or after a system reset. The states of the Mode
bits can be subsequently changed via the I2C interface if
desired. The real-time state of the AUTO pin can be read
at bit 0 in the Pin Status register (11h). An internal 50k
resistor pulls AUTO low if it is left floating.
OSCIN (Pin 36): Oscillator Input. Connect to an oscillating
signal source, preferably a sine wave, of approximately
100Hz with 2V peak-to-peak amplitude, negative peaks
above – 0.3V and positive peaks below 2.5V. When a
channel is powered and AC disconnect is enabled, this
signal is used to detect the AC impedance of the PD.
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相关代理商/技术参数 |
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| LTC4260 | 制造商:LINER 制造商全称:Linear Technology 功能描述:UV, OV and Reverse Supply Protection Controller Low Operating Current: 125μA |
| LTC4260CGN | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 24-Pin SSOP N |
| LTC4260CGN#PBF | 功能描述:IC CTLR HOT SWAP I2C 24-SSOP 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) |
| LTC4260CGN#TR | 制造商:Linear Technology 功能描述:Hot Swap Controller 1-CH 80V 24-Pin SSOP N T/R |
| LTC4260CGN#TRPBF | 功能描述:IC HOT SWAP CNTRL I2C 24-SSOP 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) |
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