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参数资料
| 型号： | LTC4227IUFD-1#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PQCC20 |
| 封装： | 4 X 5 MM, PLASTIC, MO-220, QFN-20 |
| 文件页数： | 2/20页 |
| 文件大小： | 307K |
| 代理商： | LTC4227IUFD-1#TRPBF |
LTC4227-1/LTC4227-2
10
422712f
applicaTions inForMaTion
High availability systems often employ parallel-connected
power supplies or battery feeds to achieve redundancy
and enhance system reliability. Power ORing diodes are
commonly used to connect these supplies at the point of
load, but at the expense of power loss due to significant
diode forward voltage drop. The LTC4227 minimizes this
power loss by using external N-channel MOSFETs for the
pass elements, allowing for a low voltage drop from the
supply to the load when the MOSFETs are turned on (see
Figure 1). When the input source voltage drops below the
outputcommonsupplyvoltage,theappropriateMOSFETis
turnedoff,therebymatchingthefunctionandperformance
of an ideal diode. By adding a current sense resistor and
a Hot Swap MOSFET after the parallel-connected ideal
diode MOSFETs, the LTC4227 enhances the ideal diode
performance with inrush current limiting and overcurrent
protection. This allows the boards to be safely inserted
and removed from a live backplane without damaging
the connector.
Internal VCC Supply
The LTC4227 can operate with input supplies from 2.9V
to 18V at the IN pins. The power supply to the device is
internally regulated at 5V by a low dropout regulator (LDO)
with an output at the INTVCC pin. An internal diode-OR
circuit selects the highest of the supplies at the IN and OUT
pins to power the device through the LDO. The diode-OR
scheme permits the device’s power to be temporarily kept
alive by the OUT load capacitance when the IN supplies
have collapsed or shut off.
AnundervoltagelockoutcircuitpreventsalloftheMOSFETs
from turning on until the INTVCC voltage exceeds 2.2V. A
0.1F capacitor is recommended between the INTVCC and
GND pins, close to the device for bypassing. No external
supply should be connected at the INTVCC pin so as not
to affect the LDO’s operation. A small external load of less
than 500A can be connected at the INTVCC pin.
Turn-On Sequence
The board power supply at the OUT pin is controlled with
external N-channel MOSFETs (MD1, MD2 and MH). The
ideal diode MOSFETs connected in parallel on the supply
side function as a diode-OR, while MH on the load side
acts as a Hot Swap controlling the power supplied to the
output load. The sense resistor, RS, monitors the load
current for overcurrent detection. The HGATE capacitor,
CHG, controls the gate slew rate to limit the inrush current.
Resistor RHG with CHG compensates the current control
loop, while RH prevents high frequency oscillations in the
Hot Swap MOSFET.
Figure 1. Card Resident Diode-OR with Hot Swap Application
BACKPLANE
CONNECTOR
VIN1
12V
VIN2
12V
CARD
CONNECTOR
CPO1
D2ON
ON
FAULT
PWRGD
CL
680F
12V
7.6A
R1
20k
INTVCC
Z2
SMAJ13A
GND
IN1 DGATE1
DGATE2
LTC4227
422712 F01
MD2
SiR462DP
MH
Si7336ADP
RS
0.006
HGATE
OUT
SENSE+ SENSE–
CPO2
CCP2
0.1F
IN2
+
R2
137k
R3
100k
R4
100k
RH
10
RHG
47
CHG
15nF
CCP1
0.1F
C1
0.1F
MD1
SiR462DP
EN
CT
0.1F
CF
10nF
Z1
SMAJ13A
TMR
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4227IUFD-2#PBF | 功能描述:IC CONTROLLER HOT SWAP 20-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) |
| LTC4227IUFD-2#TRPBF | 功能描述:IC CTRLR HOT SWAP 20-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) |
| LTC4228-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Ideal Diode and Hot Swap Controller |
| LTC4228CGN-1#PBF | 功能描述:IC HOT SWAP CTRLR 28SSOP 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) |
| LTC4228CGN-1#TRPBF | 功能描述:IC HOT SWAP CTRLR 28SSOP 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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