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| 型号： | LTC4261CUFD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring; Package: QFN; No of Pins: 24; Temperature Range: 0°C to +70°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC24 |
| 封装： | 4 X 5 MM, LEAD FREE, PLASTIC, QFN-24 |
| 文件页数： | 4/34页 |
| 文件大小： | 357K |
| 代理商： | LTC4261CUFD#TRPBF |
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LTC4261/LTC4261-2
12
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The LTC4261/LTC4261-2 are designed to turn a board’s
supply voltage on and off in a controlled manner, allowing
theboardtobesafelyinsertedorremovedfromalive–48V
backplane.Thedevicesalsofeatureanonboard10-bitADC
and I2C interface that allows monitoring board current,
voltages and faults. The main functional circuits of the
LTC4261/LTC4261-2 are illustrated in the Block Diagram.
In normal operation after a start-up debounce delay, the
GATE pin turns on the external N-channel FET passing
power to the load. The GATE pin is powered by a shunt
regulated 11.2V supply on the VIN pin that is derived
from –48V RTN through a dropping resistor. The turn-on
sequence starts by pulling the SS pin up. The voltage at
the SS pin is converted to a current, IGATE(UP), pulling the
GATE up. When the pass FET starts to turn on and charge
the load capacitor, the inrush current flowing through the
FET is a function of the capacitor at RAMP (CR), the load
capacitor (CL) and the ramp current (IRAMP) that flows
from the RAMP pin to CR:
IINRUSH = IRAMP
CL
CR
IRAMP and IGATE(UP) are approximately proportional to
the SS pin voltage and are limited to 20A and 11.5A,
respectivelywhenSSreachesitsclampingvoltage(2.56V).
The ACL amplifier is used for overcurrent and short-circuit
protection.ItmonitorstheloadcurrentthroughtheSENSE
pin voltage and a sense resistor RS. In an overcurrent
condition, the ACL amplifier limits the current to 50mV/
RS by pulling down GATE in an active servo loop. After a
530s timeout, the ACL amplifier turns off the pass FET.
In the event of a catastrophic short circuit, when VSENSE
crosses 250mV, a fast response comparator immediately
pulls the GATE pin down.
The DRAIN and the GATE voltages are monitored to de-
termine if power is available for the load. Two power good
signals are sequenced on the PG pin (first power good
signal)andthePGIOpin(secondpowergoodsignal),each
with a debounce delay that is twice the start-up delay. The
PGIO pin can also be used as a general purpose input or
output. The PGI pin serves as a watchdog to monitor the
output of the DC/DC module. If the module output fails to
come up, the LTC4261/LTC4261-2 shut down.
The TMR pin generates delays for initial start-up, auto-
retry following a fault, power good outputs and PGI check.
The logic circuits a re powered by an internally generated
5V supply (available on the INTVCC pin). Prior to turning
on the pass FET, both VIN and INTVCC voltages must ex-
ceed their undervoltage lockout thresholds. In addition,
the control inputs UVH, UVL, OV, EN, ON and PGI are
monitored by comparators. The FET is held off until all
start-up conditions are met.
A10-bitanalog-to-digitalconverter(ADC)isincludedinthe
LTC4261/LTC4261-2. The ADC measures SENSE resistor
voltage as well as voltage at the ADIN2/OV (SSOP/QFN)
andADINpins.Theresultsarestoredinon-boardregisters.
An I2C interface is provided to read the ADC data registers.
It also allows the host to poll the device and determine if a
faulthasoccurred.IftheALERTlineisusedasaninterrupt,
the host can respond to a fault in real time. The SDA line
is divided into SDAI (input) and SDAO (output) to facili-
tate opto coupling with the system host. Two three-state
pins, ADR0 and ADR1, are used to decode eight device
addresses. The interface can also be configured through
the ADR0 and ADR1 pins for a single-wire broadcast
mode, sending ADC data and faults status through the
SDAO pin to the host without clocking the SCL line. This
single-wire, one-way communication simplifies system
design by eliminating two optocouplers on SCL and SDAI
that are required by an I2C interface.
OPERATION
相关PDF资料 |
PDF描述 |
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| LTC4261CUFD-2#PBF | Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring; Package: QFN; No of Pins: 24; Temperature Range: 0°C to +70°C |
| LTC4261CUFD-2#TRPBF | Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring; Package: QFN; No of Pins: 24; Temperature Range: 0°C to +70°C |
| LTC4261IGN#PBF | Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring; Package: SSOP; No of Pins: 28; Temperature Range: -40°C to +85°C |
| LTC4261IGN#TRPBF | Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring; Package: SSOP; No of Pins: 28; Temperature Range: -40°C to +85°C |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4261IGN | 功能描述:IC CTRLR HOTSWAP W/ADC 28-SSOP RoHS:否 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) |
| LTC4261IGN#PBF | 功能描述:IC CTRLR HOTSWAP W/ADC 28-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) |
| LTC4261IGN#TR | 功能描述:IC CTRLR HOTSWAP W/ADC 28-SSOP RoHS:否 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) |
| LTC4261IGN#TRPBF | 功能描述:IC CTRLR HOTSWAP W/ADC 28-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) |
| LTC4261IGN-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers with ADC and I2C Monitoring |
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